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Home > Products > Discrete Semiconductor Products > Transistors > Bipolar (BJT) > Single Bipolar Transistors

Nexperia USA Inc. MMBT3906-QR

Name: MMBT3906-QR
Brand: Nexperia USA Inc.
SKU: MMBT3906-QR
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT3906-QR

Manufacturer:: Nexperia USA Inc.

Category:: Single Bipolar Transistors

Package:: TO-236-3, SC-59, SOT-23-3

Datasheet:: MMBT3906-QR.pdf

Description:: TRANS PNP 40V 0.2A TO-236AB

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBT3906-QR from Nexperia is a PNP bipolar junction transistor designed for general-purpose switching and linear amplification in automotive-grade SMT circuits. It delivers V_CEO = −40 V, I_C = −200 mA, h_FE = 100–300 (at I_C = −10 mA), V_CE(sat) ≤ −400 mV (at I_C = −50 mA, I_B = −5 mA), and is qualified to AEC-Q101 for under-hood control modules.

For engineers reviewing the MMBT3906-QR datasheet, MMBT3906-QR pinout, MMBT3906-QR application, or MMBT3906-QR equivalent, this page provides verified package mapping, validated switching timing (t_d/t_r/t_s/t_f ≤ 35/35/225/75 ns), thermal resistance (R_th(j-a) = 500 K/W), and automotive qualification status - all critical for reliability-critical PCB layout and BOM validation.

Technical Context

This discrete PNP transistor operates as a current-controlled switch or small-signal amplifier with fixed polarity and no integrated biasing. Its DC current gain varies from 30 to 300 across I_C = −0.1 mA to −100 mA, and its saturation behavior is characterized at multiple I_C/I_B ratios and temperatures (−55 °C to +150 °C).

Switching performance is defined by standardized test conditions: t_d, t_r, t_s, and t_f measured using a 500 µs pulse width, 10 µs on-time, and specified R₁/R₂/R_B/R_C network per Figure 6. Thermal derating follows FR4 PCB mounting rules with single-sided copper and standard SOT23 footprint.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−40 V: Maximum safe collector-emitter voltage before breakdown in open-base configuration
I_C	−200 mA: Continuous DC collector current rating; defines maximum load drive capability
h_FE	100–300 @ V_CE = −1 V, I_C = −10 mA: Confirmed DC current gain range for stable bias design
V_CE(sat)	≤ −400 mV @ I_C = −50 mA, I_B = −5 mA: Verified low-saturation voltage enabling efficient switching at medium current
t_s	225 ns: Measured storage time under defined test circuit; critical for turn-off delay in PWM drivers
R_th(j-a)	500 K/W: Thermal resistance on FR4 PCB; determines max power dissipation (250 mW) at T_amb ≤ 25 °C
AEC-Q101	Qualified: Validated for automotive use per stress-test requirements including HTRB, HTSL, and temperature cycling

Pinout & Package

SOT23 plastic surface-mount package: 3-terminal, 1.9 mm pitch, 2.9 mm × 1.3 mm × 1.0 mm body; optimized for reflow and wave soldering per Figures 8–9.

Pin/Terminal	Circuit Role	Design Meaning
1	Base (B)	Current-controlled input node; requires external resistor-based biasing for switching or amplification
2	Emitter (E)	Common terminal for PNP topology; connects to higher potential rail in high-side switch configurations
3	Collector (C)	Output current path; sinks current when base is sufficiently forward-biased relative to emitter

Key Features

Feature	Design Value
AEC-Q101 qualification	Validated for automotive applications including engine control, lighting, and body electronics
V_CEO = −40 V	Supports 24 V automotive systems with margin against transients and load dump events
I_C = −200 mA continuous	Drives relays, LEDs, and small solenoids without external heat sinking on standard PCB
Low V_CE(sat) ≤ −400 mV	Reduces conduction loss and self-heating in high-duty-cycle switching applications
Fast switching (t_s = 225 ns)	Enables operation up to ~1 MHz in digital logic interface and PWM dimming circuits

Applications

Automotive Lighting Control

Industrial Sensor Interface

Use Scenario: Driving LED brake/tail lamps in 12 V vehicle architectures with PWM dimming.

IC Role / Device Role / Timing Role: PNP high-side switch controlling current flow from battery rail to LED anode.

Use Value: −40 V V_CEO withstands load-dump spikes; −400 mV V_CE(sat) minimizes power loss at 150 mA typical load.

Use Scenario: Level-shifting and signal inversion between 3.3 V microcontrollers and 5 V/12 V industrial sensors.

IC Role / Device Role / Timing Role: Discrete logic-level translator with defined h_FE and fast t_r/t_f.

Use Value: Verified 35 ns rise/fall times ensure clean edge integrity; AEC-Q101 ensures field reliability in factory automation.

Power Supply Enable Circuit

Relay Driver Stage

Use Scenario: Enabling/disabling auxiliary 5 V LDO outputs via MCU GPIO in infotainment head units.

IC Role / Device Role / Timing Role: Low-power PNP switch turning on N-channel MOSFET gate driver or LDO EN pin.

Use Value: −6 V V_EBO rating allows safe operation with 3.3 V GPIO; h_FE ≥ 100 ensures robust drive at µA-level base current.

Use Scenario: Driving 12 V, 100 mA coil relays in HVAC control modules.

IC Role / Device Role / Timing Role: Medium-current saturated switch with flyback diode integration support.

Use Value: −200 mA I_C rating matches relay coil requirements; 225 ns storage time enables reliable de-energization in <10 ms cycles.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP switching transistor applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBT3906LT1G (ON Semiconductor)	V_CEO = −40 V, I_C = −200 mA, but AEC-Q101 not claimed; h_FE min = 100 (same test condition)	Not automotive-qualified; suitable for commercial/industrial only	Select when AEC-Q101 is not required and cost sensitivity outweighs qualification assurance
PN2907A (Central Semiconductor)	V_CEO = −60 V, I_C = −600 mA, TO-92 package; higher power but larger footprint and slower t_s (300 ns)	Through-hole assembly; better for prototyping or high-voltage margin needs	Choose for legacy designs requiring through-hole or where −60 V rating is mandatory for system-level safety

Compared with MMBT3906-QR, MMBT3906LT1G offers identical electrical specs but lacks automotive qualification, while PN2907A trades SMT compatibility and speed for higher voltage/current ratings and through-hole fit - making MMBT3906-QR optimal for space-constrained, AEC-compliant SMT switching.

Availability

MMBT3906-QR is available at Aetrix Electronics and suitable for automotive lighting control, industrial sensor interfaces, power supply enable circuits, and relay driver stages requiring stable component supply across production lifecycles.

Supply support for MMBT3906-QR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Nexperia is a global semiconductor expert focused on essential efficiency technologies, delivering high-performance, reliable discrete and logic devices.

MMBT3906-QR belongs to Nexperia's AEC-Q101-qualified discrete transistor portfolio, engineered specifically for automotive subsystems demanding robustness, thermal stability, and long-term supply assurance.

FAQ

Is MMBT3906-QR pin-compatible with standard MMBT3906 variants?

Yes - MMBT3906-QR uses the standard SOT23-3 pinout (1 = Base, 2 = Emitter, 3 = Collector) and matches mechanical and electrical footprints of non-Q variants like MMBT3906LT1G. No PCB redesign is needed when upgrading to AEC-Q101-qualified stock.

What is the maximum allowable ambient temperature for continuous operation at full rated current?

At I_C = −200 mA, power dissipation reaches ~200 mW (assuming V_CE(sat) ≈ −400 mV). With R_th(j-a) = 500 K/W, junction temperature rise is 100 K; thus maximum T_amb is +50 °C to keep T_j ≤ +150 °C. Derating is required above this ambient.

Does MMBT3906-QR include integrated ESD protection?

No - MMBT3906-QR has no built-in ESD protection structure. Per datasheet Section 8, absolute maximum V_EBO is −6 V; external series resistors or TVS diodes are recommended for GPIO-connected applications exposed to handling or system-level ESD events.

Can MMBT3906-QR be used in linear amplification mode?

Yes - its h_FE is specified from −0.1 mA to −100 mA with stable gain curves across temperature (Fig. 1), and V_BE characteristics support predictable biasing (Fig. 3). However, it is optimized for switching; for precision analog use, dedicated small-signal transistors with tighter h_FE tolerance are preferred.

MMBT3906-QR Specifications

Product attributes: Attribute value

Manufacturer:: Nexperia USA Inc.

Series:: -

Package/Case:: TO-236-3, SC-59, SOT-23-3

Packaging:: Tape & Reel (TR)

Product Status:: Active

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 200 mA

Voltage - Collector Emitter Breakdown (Max):: 40 V

Vce Saturation (Max) @ Ib, Ic:: 400mV @ 5mA, 50mA

Current - Collector Cutoff (Max):: 50nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 10mA, 1V

Power - Max:: 250 mW

Frequency - Transition:: 250MHz

Operating Temperature:: 150°C (TJ)

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: TO-236AB

MMBT3906-QR FAQ

1.How can I place an order for MMBT3906-QR through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT3906-QR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for MMBT3906-QR reliable?

The price and inventory of MMBT3906-QR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT3906-QR is usually 5 days.

3.What payment methods are accepted for MMBT3906-QR?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT3906-QR transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT3906-QR?

MMBT3906-QR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT3906-QR order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for MMBT3906-QR?

For technical support, including MMBT3906-QR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT3906-QR requirements.

6.How does Aetrix verify that MMBT3906-QR is sourced from the original manufacturer or authorized distributors?

All MMBT3906-QR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MMBT3906-QR meets industry standards.

7.What is the process for return or replacement of MMBT3906-QR?

All MMBT3906-QR units undergo pre-shipment inspection (PSI). If there is an issue with MMBT3906-QR, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The MMBT3906-QR part is unused and in its original packaging.

Return procedure for MMBT3906-QR:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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