PIC16F631-I

8-bit Mid-Range PIC MCU, 1.75KB Flash, 64B RAM, 128B EEPROM, 2 comparators, nanoWatt

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Manufacturer Part：

PIC16F631-I

Package：

20-pin PDIP / SOIC / SSOP / QFN

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Description

Product Overview

The PIC16F631-I is a 20-pin, 8-bit Flash-based CMOS microcontroller from Microchip Technology, featuring the Mid-Range PIC architecture with 35 instructions and an 8-level deep hardware stack. This cost-effective MCU offers 1.75KB (1024 x 14 words) of Flash program memory, 64 bytes of RAM, and 128 bytes of data EEPROM. Operating at up to 20 MHz with a 200 ns instruction cycle, it integrates a precision 8 MHz internal oscillator factory calibrated to ±1%, along with two analog comparators with programmable on-chip voltage reference. With its nanoWatt Technology for low-power operation, the PIC16F631 is ideal for battery-powered applications, industrial sensors, appliance controls, and cost-sensitive consumer products requiring analog comparison functionality without the overhead of a full ADC.

Key Specifications

Core Architecture 8-bit PIC (Mid-Range Core)
Program Memory 1.75KB Flash (1K x 14 words)
RAM 64 bytes
Data EEPROM 128 bytes
Maximum Speed 20 MHz (5 MIPS)
Operating Voltage 2.0V to 5.5V
I/O Pins 18
ADC None
Comparators 2
Timers 1 x 8-bit (TMR0) + 1 x 16-bit (TMR1)
PWM 1 (via CCP on other family members)
Communication None (simplified variant)
Internal Oscillator 8 MHz (±1% factory calibrated)
Stack Levels 8
Operating Temperature -40°C to +85°C (Industrial)
Package 20-pin PDIP / SOIC / SSOP / QFN

Features

  • Mid-Range PIC architecture with 35 single-cycle instructions and 8-level stack
  • Precision internal oscillator: 8 MHz factory calibrated to ±1%
  • Software selectable frequency range: 8 MHz to 32 kHz
  • Two analog comparators with programmable on-chip voltage reference (CVREF)
  • SR Latch mode for comparator outputs (555 timer emulation)
  • 128 bytes of data EEPROM for non-volatile storage
  • nanoWatt Technology for ultra-low power consumption
  • Ultra Low-Power Wake-up (ULPW) module
  • Enhanced Timer1 with gate sync latch and low-power oscillator option
  • Power-on Reset (POR), Power-up Timer (PWRT), and Oscillator Start-up Timer (OST)
  • Brown-out Reset (BOR) with software selectable trip points
  • Enhanced Watchdog Timer (WDT) with on-chip RC oscillator
  • In-Circuit Serial Programming (ICSP) via two pins
  • Programmable code protection for program and data memory
  • High current I/O pins: 25 mA sink/source per pin

Applications

  • Industrial sensor interfaces and limit detection
  • Battery-powered monitoring devices
  • Appliance control and simple motor control
  • Low-cost consumer electronics
  • Level sensing and threshold detection
  • Portable medical devices
  • Automotive sensor interfaces

The PIC16F631 is a 20-pin Flash-based 8-bit CMOS microcontroller from Microchip Technology, part of the popular PIC16F6xx family featuring the Mid-Range PIC architecture. This device is the entry-level member of the PIC16F631/677/685/687/689/690 family, offering 1.75KB (1024 x 14 words) of Flash program memory, 64 bytes of RAM, and 128 bytes of data EEPROM. It operates at up to 20 MHz with a 200 ns instruction cycle, delivering 5 MIPS of processing power. A key feature is the integrated precision internal oscillator operating at 8 MHz (factory calibrated to ±1%), which can be software divided down to 32 kHz for low-power operation. The analog comparator module includes two comparators with a programmable on-chip voltage reference, enabling threshold detection, level sensing, and SR latch (555 timer) applications without external components. With nanoWatt Technology providing multiple power-saving modes including Ultra Low-Power Wake-up (ULPW), the PIC16F631 is well-suited for battery-powered applications. The device is available in PDIP, SOIC, SSOP, and QFN packages with industrial temperature range (-40°C to +85°C).

The PIC16F631 operates on a Mid-Range PIC RISC core with a 13-bit program counter and an 8-level deep hardware stack. Instructions are fetched from 14-bit wide Flash program memory, with most executing in a single clock cycle. The Harvard architecture provides separate buses for program and data memory, allowing simultaneous access. Data memory consists of 64 bytes of general-purpose SRAM (file registers) and 128 bytes of EEPROM for non-volatile data storage. The internal oscillator module generates a stable 8 MHz clock (factory calibrated to ±1%) with software-selectable division ratios down to 32 kHz, eliminating the need for an external crystal in many applications. The two analog comparators compare voltage levels on their inputs, with results readable from status registers or configurable to directly drive output pins. The Comparator Voltage Reference (CVREF) module provides a programmable reference voltage derived from VDD, eliminating external reference components. Timer0 is an 8-bit timer/counter with prescaler, while Timer1 is a 16-bit timer/counter with gate control and optional low-power 32 kHz oscillator operation. Power management features include Sleep mode, Idle mode, and Doze mode for flexible power/performance trade-offs. The ULPW module allows waking from Sleep on pin change with minimal current consumption.

Pin (PDIP-20/SOIC-20) Name Type Function
1 VDD P Positive Supply Voltage
2 RA5/T1CKI/OSC1/CLKIN I/O Port A I/O / Timer1 Clock / Oscillator Input
3 RA4/T1G/OSC2/CLKOUT I/O Port A I/O / Timer1 Gate / Oscillator Output
4 RA3/MCLR/VPP I/P Port A Input / Master Clear / Programming Voltage
5 RC5 I/O Port C I/O
6 RC4/C2OUT/SRQ I/O Port C I/O / Comparator2 Output / SR Latch Output
7 RC3/C12IN3- I/O Port C I/O / Comparator Negative Input 3
8 RC6 I/O Port C I/O
9 RC7 I/O Port C I/O
10 RB7 I/O Port B I/O / ICSP Data
11 RB6 I/O Port B I/O / ICSP Clock
12 RB5 I/O Port B I/O
13 RB4 I/O Port B I/O
14 RC2/C12IN2- I/O Port C I/O / Comparator Negative Input 2
15 RC1/C12IN1- I/O Port C I/O / Comparator Negative Input 1
16 RC0/C2IN+/C1IN+ I/O Port C I/O / Comparator Positive Input
17 VSS P Ground Reference
18 RA0/C1IN+/AN0 I/O Port A I/O / Comparator1 Positive Input
19 RA1/C2IN+/AN1 I/O Port A I/O / Comparator2 Positive Input
20 RA2/T0CKI/INT/C1OUT I/O Port A I/O / Timer0 Clock / Ext Interrupt / C1 Output
  • Industrial threshold detection and limit sensing
  • Battery-powered portable monitors and sensors
  • Appliance control panels and user interfaces
  • Low-cost consumer electronic devices
  • Level sensing and over/under voltage detection
  • Portable medical devices and health monitors
  • Automotive sensor signal conditioning
Manufacturer Part Number Package Notes
Microchip PIC16F677-I 20-pin Same package, adds 12-ch 10-bit ADC, SPI/I2C
Microchip PIC16F690-I 20-pin 7KB Flash, full peripherals, EUSART
Microchip PIC12F635-I 8-pin Smaller package, 1 comparator
Microchip PIC16F636-I 14-pin 3.5KB Flash, KEELOQ crypto module
Microchip PIC16F685-I 20-pin 7KB Flash, 12-ch ADC, ECCP
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Quality Assurance

Quality is the core foundation of our long-term global cooperation. With over 20 years of experience in the electronic component industry, Materialparts has built a strict and standardized quality management system covering component sourcing, incoming inspection, full-batch testing, packaging and delivery. We are committed to delivering 100% genuine, high-reliability electronic components for industrial control, automotive electronics, consumer electronics and medical device industries, and fully safeguarding your production and R&D projects.

1. Authorized & Genuine Sourcing Promise

All of our electronic components are procured from official authorized distributors and original manufacturers. We strictly reject counterfeits, refurbished parts, disassembled components and gray-market goods. Every product is guaranteed to be brand-new original parts and fully consistent with the original technical parameters. For branded products such as NXP IC series, we maintain complete supply channel documents to realize full product traceability.

2. Strict Full-batch Quality Inspection

We implement 100% full-batch quality control for all goods before shipment. Our professional QC team conducts multi-dimensional tests including appearance inspection, electrical parameter testing, performance verification and packaging check. Each batch of components is attached with complete inspection reports and batch records. We stick to zero-tolerance standards for defective products to ensure every piece of component meets industrial application requirements.

3. Industry Standard Compliance

Our products comply with a variety of international industry quality standards to adapt to high-standard application scenarios:
  • Automotive Electronics: All automotive-grade components pass AEC-Q series certification, featuring excellent stability and durability to adapt to complex vehicle operating environments.
  • Medical Devices: High-reliability components meet medical industry safety and compliance regulations, ensuring stable operation for medical equipment.
  • Industrial Control & Consumer Electronics: Products conform to universal international electronic industry standards, suitable for long-term continuous operation of various equipment.

4. Professional Reliability Control

For static-sensitive, moisture-sensitive and precision components such as ICs, PCBs, sensors and connectors, we carry out reliability screening in advance. Combined with standardized ESD anti-static packaging and vacuum moisture-proof packaging, we avoid component damage caused by static electricity, dampness or collision during storage and transportation, and retain the original performance of products.

5. Traceability Management System

We establish a complete product traceability system. Each batch of goods corresponds to independent batch number, sourcing record, inspection record and delivery record. Customers can query the whole lifecycle information of components at any time. This system effectively solves quality risks and facilitates after-sales handling and production quality control for your company.

6. After-sales Quality Guarantee

If any product is confirmed to have non-conformity quality problems due to our reasons after receipt, we provide free return, exchange and supplementary delivery services. Our professional quality team will also conduct root cause analysis to optimize our quality control process. We respond to quality feedback within 24 hours to resolve your worries efficiently.

Contact Us

If you have inquiries about our quality standards, inspection procedures or product certification documents, please feel free to contact us:

 

Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

Shipping & Payment

Materialparts is a professional global supplier of electronic components with over 20 years of industry experience. We provide one-stop supply of passive components, integrated circuits, as well as parts for industrial control, automotive electronics, consumer electronics and medical devices. Below are the unified shipping and payment policies applicable to all orders, samples and bulk purchases worldwide.

1. Payment Terms

We offer a variety of secure and convenient payment methods to meet diverse business cooperation needs. Details are as follows:
  1. Accepted Payment Methods
  • T/T (Bank Wire Transfer): The primary settlement method for bulk orders and a widely used international payment channel.
  • PayPal: Ideal for small orders, sample orders and quick payments.

  1. Settlement Currency

     

    US Dollar (USD) is the default settlement currency. RMB is available for domestic customers.

  2. Bank Charges

     

    All transfer fees, intermediary bank charges and other remittance-related expenses shall be borne by the buyer.

  3. Payment Requirements
  • Sample and small orders: Shipment will be arranged upon full payment.
  • In-stock bulk orders: Goods will be delivered within 2 to 3 working days after full payment.

2. Shipping & Delivery

We partner with leading global logistics providers to ensure safe and fast delivery worldwide. Relevant details are listed below:
  1. Logistics Partners
  • International Express: DHL, FedEx, UPS, TNT
  • Economy Logistics: Air freight and sea freight for large-volume cargo
  • Domestic Delivery: SF Express, Yunda Express
  1. Order Processing Time
  • In-stock items: Orders confirmed and fully paid before 14:00 (GMT+8) will be shipped on the same day. All other orders will be dispatched within 1 to 2 working days.
  • Out-of-stock or sourced items: The delivery lead time will be confirmed separately according to brand and inventory status.
  1. Estimated Transit Time
  • International Express: 3 – 7 working days globally
  • Air Freight: 7 – 12 working days
  • Sea Freight: 25 – 40 working days for heavy and large bulk cargo
  1. Shipping Fee Rules
  • Shipping cost is calculated based on package weight, volume, destination and delivery method.
  • Both freight prepaid and freight collect are available. Please provide your courier account number in advance if you choose freight collect.
  • Free international express delivery is offered for large orders. Terms for long-term partners can be negotiated separately.
  1. Shipment Tracking
     

    Within 24 hours after dispatch, we will send the tracking number, commercial invoice, packing list and other documents to your email or communication account. You may check the shipment status online in real time.

3. General Order Rules & Notes

  1. MOQ & Sample Service

     

    We support flexible minimum order quantities for samples, small-batch and large-batch orders. All sample orders shall comply with the above shipping and payment policies.

  2. Packaging Standard

     

    All electronic components are packed with professional anti-static and shockproof materials. Original factory packaging is available for branded chips and integrated circuits.

4. Customs & Liability Statement

  1. Import Duties & Taxes

     

    All import duties, customs clearance fees and local taxes incurred for international shipments shall be borne by the buyer. We will provide complete customs documents to assist you with clearance procedures.

  2. Handling of Lost or Damaged Goods
  • In case of loss or severe damage during transit, please contact us within 48 hours after receiving the tracking information. We will assist you in filing a claim with the logistics provider.
  • We shall not be liable for any losses caused by incorrect delivery address, wrong contact information or the buyer’s refusal to complete customs clearance.

5. Local Pickup in Shenzhen

Local pickup service is available for customers in Shenzhen and surrounding areas:
  • Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong Province, China
  • Business Hours: 09:00 – 18:00, Monday to Friday. Closed on weekends and official public holidays.
  • Notice: Please make an appointment via email or communication tools one day in advance, and present your order information upon pickup.

Contact Information

Email: info@ic-vendor.com

Tel / WhatsApp: +86 13760382860

Service & Packaging

Materialparts is a professional electronic component supplier based in Shenzhen, China, with over 20 years of global trading experience. We integrate component procurement, quality inspection, technical support, customized packaging, and global delivery services to provide one-stop supply chain solutions. Our business covers industrial control, automotive electronics, consumer electronics, medical devices and other industries. We always adhere to genuine sources, stable supply and considerate after-sales service.

Core Services

1. One-stop Sourcing & BOM Support

We specialize in a full range of passive and active electronic components, including SMD resistors, power resistors, connectors, aviation connectors, LED beads, flexible circuit boards, printed circuit boards, and integrated circuits. Our professional team provides BOM list consolidation, component matching, and alternative model recommendation services. We support sample orders, small-batch trial production, and mass production orders with flexible MOQs to meet diverse procurement needs.

2. Genuine Product Guarantee & Full-process Quality Inspection

All products are sourced from official authorized channels and are 100% original genuine parts. Every batch of goods undergoes strict full-process quality inspection before delivery, with complete batch records and traceability documents provided. Our products comply with AEC-Q standards for automotive electronics and high-reliability specifications for medical devices. We eliminate counterfeits, refurbished parts and defective products from the source to secure your project production.

3. Fast Quotation & Order Processing

Our customer service team responds promptly to inquiries and quotation requests. All in-stock orders will be processed within one working day. We provide stocking reservation services for long-term cooperative customers, effectively solving problems such as component shortages and unstable supply chains.

4. Professional Technical Support

Our senior engineer team provides free technical consultation, model selection guidance and original manufacturer datasheets. We assist customers in solving problems related to product R&D, circuit design and component application, providing reliable technical support for project progress.

5. Sourcing for Special Components

Relying on our global supply chain network, we professionally source scarce components, obsolete parts and customized special components to efficiently solve your procurement difficulties.

6. Global Logistics & Document Services

We cooperate with mainstream international logistics providers including DHL, FedEx, UPS and TNT to achieve fast global delivery. We can provide complete export documents such as customs declaration files, commercial invoices and packing lists to ensure smooth customs clearance for international shipments. Local pickup is also available for customers in Shenzhen, China.

Professional Packaging Standards

Electronic components are sensitive to static electricity, collision, moisture and dust. We adopt industry-standard anti-static packaging solutions to fully ensure the integrity of goods during transportation and storage.

1. General Packaging Specifications

  • All components are packed separately to avoid damage caused by friction and collision;
  • Shockproof buffer materials are added for fragile products to ensure transportation safety;
  • Each package is clearly marked with part number, quantity, batch number and specifications for easy inventory counting and management.

2. Classified Professional Packaging

  • Anti-static Packaging: Static-sensitive components such as chips, circuit boards and sensors are packaged with anti-static bags, shielding boxes and conductive foam in strict accordance with international anti-static standards to prevent static damage.
  • Vacuum Moisture-proof Packaging: Moisture-sensitive components are vacuum-sealed with desiccants to isolate humid air, suitable for ocean transportation and long-term storage.
  • Original Factory Packaging: Integrated circuits of brands such as NXP are delivered with original reels, trays or tubes by default, retaining complete original packaging and adapting to automated SMT production lines.
  • Discrete Device Packaging: Discrete devices such as SMD resistors, power resistors and LEDs are quantitatively and classifiedly packaged with accurate quantity and clear marking.
  • Connector / Aviation Connector Packaging: Hard outer packaging is adopted to prevent pin bending and structural deformation.

3. Custom Packaging Services

We provide value-added services including personalized packaging, custom labeling and re-reeling according to customer requirements, fully matching your production and warehouse management standards.

Contact Information

For service consultation or packaging customization, please feel free to contact us:
Email: info@ic-vendor.com
Tel / WhatsApp: +86 13760382860
Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China
 

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