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MMBT3906

PNP 40V 200mA, hFE 100-300, fT 250MHz, SOT-23, complementary to MMBT3904, general-purpose switching

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Manufacturer Part：

MMBT3906

Package：

SOT-23 (TO-236) (2.9 x 1.3 x 1.0 mm, 1.9mm pitch)

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Description

The MMBT3906 is a general-purpose PNP switching transistor in a SOT-23 surface-mount package. Key specifications include VCEO of -40 V, continuous collector current of -200 mA, DC current gain (hFE) of 100-300 at IC = -10 mA, transition frequency (fT) of 250 MHz, and total power dissipation of 250 mW. The complementary NPN type is the MMBT3904. Available from multiple manufacturers including Nexperia, Diodes Inc, and onsemi. AEC-Q101 qualified variants are available for automotive applications. Operating junction temperature range is -55°C to +150°C.

The MMBT3906 is the industry-standard PNP general-purpose switching transistor in a SOT-23 surface-mount package, and the complementary pair to the equally ubiquitous MMBT3904 (NPN). It is one of the most widely used discrete transistors in electronics, found in virtually every category of product from consumer electronics to industrial systems.

The device features a VCEO of -40 V and IC of -200 mA, covering the majority of low-power switching and signal amplification needs. The hFE ranges from 100 to 300 at IC = -10 mA (Class A grade), providing ample gain for small-signal applications. At higher currents (IC = -100 mA), hFE drops to a minimum of 30, which must be accounted for in saturated switching designs.

The transition frequency of 250 MHz makes the MMBT3906 suitable for RF and high-speed switching applications up to approximately 25 MHz (1/10 of fT as a practical rule). Switching times are fast: 35 ns delay, 35 ns rise, 225 ns storage, and 75 ns fall at IC = -10 mA.

The SOT-23 package is the smallest common transistor footprint, measuring just 2.9 x 1.3 mm. The 250-mW power dissipation (at 25°C ambient on standard FR4) limits the device to small-signal and low-power switching. For higher power, the through-hole 2N3906 (TO-92) or SOT-223 variants are available.

The MMBT3906 is a multi-source component available from Nexperia, Diodes Inc, onsemi, Infineon, and many others. AEC-Q101 qualified variants (MMBT3906Q or MMBT3906-Q) are available from most manufacturers for automotive applications. The device is also available in tape-and-reel packaging (3,000 units per 7-inch reel) for automated assembly.

**PNP Bipolar Junction Transistor:** The MMBT3906 uses a planar epitaxial PNP structure. Current flows from emitter (P) to collector (P) when the base (N) is biased negative relative to the emitter. Base current modulates the collector current with a gain factor hFE. In the active region, IC = hFE × IB; in saturation, VCE drops to VCE(sat) (typically -250 mV at IC = -10 mA, IB = -1 mA).

**Switching Operation:** For saturated switching, the base is overdriven (IB > IC/hFE) to minimize VCE(sat) and power dissipation. Turn-on delay and rise time are dominated by base charge storage buildup. Turn-off involves removing stored base charge (storage time, 225 ns) followed by collector current fall (fall time, 75 ns). A reverse base current (IB2) speeds up turn-off by actively removing stored charge.

**Amplifier Operation:** In the linear region, the MMBT3906 provides voltage amplification when biased with a collector load resistor. The 250-MHz fT and low noise figure (4 dB at IC = -100 µA) make it suitable for audio and IF amplifier stages. The hFE variation (100-300) requires careful bias design, typically using emitter degeneration or feedback to stabilize the operating point.

**Complementary Pair:** The MMBT3906 (PNP) and MMBT3904 (NPN) have matched characteristics (same VCEO, IC, fT), enabling push-pull amplifier output stages, H-bridge motor drivers, and complementary current mirrors with symmetric performance.

Pin Name Type Description
1 B (Base) I Base; controls collector current; typical VBE(sat) = -0.85V at IC=-10mA; input impedance ~kΩ range; must be current-limited with series resistor
2 E (Emitter) I/O Emitter; current source terminal; most positive terminal in PNP; connect to supply rail through load for common-emitter configuration
3 C (Collector) I/O Collector; current sink terminal; VCE(sat) = -250mV typ at IC=-10mA; connect to load resistor; substrate is isolated from all terminals
Application Description
Logic-Level Signal Inversion Invert logic signal from MCU GPIO; PNP inverts active-low to active-high; base resistor sets switching speed and current; VCE(sat) < 0.4V provides clean logic level; complementary MMBT3904 creates non-inverting buffer pair
Load Switch (High-Side PNP) Switch power to a load from positive supply rail; MCU drives base through resistor; -200mA max load current suits LEDs, relays, small motors; base resistor = (VCC – VBE – VGPIO) / IB where IB = IC / hFE(min)
Push-Pull Audio Output Pair with MMBT3904 for Class AB push-pull amplifier; matched fT and VCEO ensure symmetric positive/negative half-cycles; 200mA max per device limits output to ~100mW into 8Ω; bias diodes prevent crossover distortion
Model Manufacturer Compatibility Key Difference
MMBT3904 Nexperia Complementary NPN NPN complement; same VCEO (40V), IC (200mA), fT (250MHz); same SOT-23 pinout; use for push-pull pairs and complementary circuits
BC857B Nexperia Pin-Compatible PNP SOT-23; -45V/-100mA; higher hFE (220-475 B-group); lower fT (100MHz); better for DC biasing; use when higher gain needed at low current
MMBT4403 onsemi Pin-Compatible Upgrade PNP SOT-23; -40V/-600mA; higher current; hFE=100-300 at 150mA; use when 200mA MMBT3906 is insufficient
2N3906 Multiple Functional Equivalent, TH Through-hole TO-92 version; same electrical specs; 625mW dissipation (vs 250mW); use for prototyping and hand-assembly
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Address: Room 2919, Guoli Building, Huaqiang North, Futian District, Shenzhen, Guangdong, China

 

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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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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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