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SMBJ120A

600W unidirectional TVS diode, 120V standoff, 193V clamp, DO-214AA (SMB)

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Manufacturer Part：

SMBJ120A

Package：

DO-214AA (SMB)

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Description

Product Overview

The SMBJ120A is a 600 W surface-mount transient voltage suppressor (TVS) diode in a DO-214AA (SMB) package, designed to protect sensitive electronics from voltage transients induced by lightning and other transient events. With a reverse standoff voltage of 120 V and a maximum clamping voltage of 193 V at 3.1 A peak pulse current, it is suitable for protecting 120 V nominal bus lines and telecom interfaces.

Key Specifications

Reverse Standoff Voltage (VRWM) 120 V
Breakdown Voltage (VBR) 133 V min / 147 V max
Maximum Clamping Voltage (VC) 193 V @ IPP = 3.1 A
Peak Pulse Power (10/1000 µs) 600 W
Peak Pulse Current (IPP) 3.1 A
Reverse Leakage (IR) 1 µA max @ VRWM
Polarity Unidirectional
Operating Temperature -65°C to 150°C
Package DO-214AA (SMB)
ESD Rating IEC 61000-4-2: 15 kV Air / 8 kV Contact

Features

  • 600 W peak pulse power dissipation at 10/1000 µs waveform
  • Low incremental surge resistance for excellent clamping capability
  • Fast response time: typically less than 1.0 ps from 0 V to BV min
  • Glass passivated chip junction for reliable operation
  • Typical failure mode is short circuit for fail-safe protection
  • IEC 61000-4-2 ESD protection: 15 kV air, 8 kV contact

Applications

  • Telecom line card transient protection
  • 120 V DC bus protection in industrial power supplies
  • Automotive 24 V/48 V system overvoltage protection
  • Consumer electronics input port ESD/surge protection
  • LED lighting driver transient suppression

The SMBJ120A is a 600 W transient voltage suppressor diode from the Littelfuse SMBJ series, designed for surface-mount applications to protect sensitive electronic equipment from voltage transients induced by lightning and other transient events. The unidirectional device has a reverse standoff voltage of 120 V and clamps transients to a maximum of 193 V at 3.1 A peak pulse current. The glass passivated chip junction ensures reliable operation, while the typical failure mode is a short circuit, providing fail-safe protection. The DO-214AA (SMB) package offers a low-profile surface-mount footprint optimized for board space.

The SMBJ120A operates as a voltage-clamping device: (1) Normal Operation — below the reverse standoff voltage (120 V), the TVS diode presents a very high impedance (leakage < 1 µA), effectively invisible to the protected circuit; (2) Transient Event — when a voltage spike exceeds the breakdown voltage (133–147 V), the device avalanches and conducts heavily, clamping the voltage across its terminals to the maximum clamping voltage (193 V at 3.1 A), thereby diverting surge energy away from the protected load; (3) Recovery — after the transient subsides, the device returns to its high-impedance state. The unidirectional configuration provides clamping for positive transients and forward diode conduction for negative transients. The 600 W peak pulse power rating at 10/1000 µs waveform ensures sufficient energy absorption for typical surge events.

Pin Function
Cathode (band side) Positive terminal — connect toward the protected line
Anode Negative terminal — connect toward ground
  • Telecom line card protecting SLIC circuits from lightning-induced surges on 120 V tip/ring lines
  • Industrial 120 V DC bus protection against load-dump and switching transients
  • Automotive 48 V mild-hybrid bus overvoltage protection with 15 kV ESD rating
  • Consumer electronics AC/DC power adapter output transient suppression
  • LED street lighting driver input protection against surge events per IEC 61000-4-5
Model Manufacturer Key Difference
SMBJ120CA Littelfuse Bidirectional version for AC signal protection
SMAJ120A Littelfuse 400 W version in smaller DO-214AC (SMA) package
SMCJ120A Littelfuse 1500 W version in larger DO-214AB (SMC) package
P6KE120A Various 600 W through-hole alternative in DO-15 package
1.5SMC120A STMicroelectronics 1500 W SMC alternative
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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:
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  • 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.

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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.

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

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    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.

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

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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.

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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

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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;
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  • 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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