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

onsemi MMBT2907

Name: MMBT2907
Brand: onsemi
SKU: MMBT2907
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBT2907

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MMBT2907.pdf

Description:: TRANS PNP 40V 0.8A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBT2907 from Fairchild Semiconductor is a PNP general-purpose bipolar junction transistor designed for amplification and switching in low-to-medium power circuits, with V_CEO = 60 V, I_C = 800 mA continuous, and f_T = 200 MHz - used in discrete logic inverters, relay drivers, and LED current control stages.

For engineers reviewing the MMBT2907 datasheet, pinout, applications, or equivalent options, this page delivers verified electrical specs, SOT-23 package mapping, thermal derating data, switching timing curves, and validated alternative transistors for design-in and BOM optimization.

Technical Context

This PNP BJT operates with negative-polarity voltages and currents, featuring a DC current gain (h_FE) of 100 at I_C = 150 mA and V_CE = 10 V, and saturation voltage V_CE(sat) ≤ 0.4 V under same conditions. Its 200 MHz f_T supports high-speed switching up to 100 ns turn-off time.

Thermal performance is defined by R_θJA = 357 °C/W on FR-4 PCB (1.6" × 1.6"), enabling operation from −55°C to +150°C junction temperature. The device uses Process 63 and is rated for 350 mW total dissipation at 25°C ambient.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	60 V - Maximum collector-emitter blocking voltage before breakdown; defines safe operating voltage in common-emitter switch configurations.
I_C (continuous)	800 mA - Absolute max DC collector current; usable up to 500 mA with guaranteed h_FE ≥ 50 and V_CE(sat) ≤ 1.6 V.
f_T	200 MHz - Current gain–bandwidth product at I_C = 50 mA, V_CE = 20 V; sets upper limit for small-signal amplifier bandwidth.
t_off	100 ns - Turn-off time at V_CC = 6.0 V, I_C = 150 mA; determines minimum pulse repetition rate in digital switching.
R_θJA	357 °C/W - Junction-to-ambient thermal resistance on standard FR-4 PCB; requires heatsinking or layout derating above ~100 mW sustained power.
h_FE (min)	50 - Minimum DC current gain at I_C = 500 mA, V_CE = 10 V; ensures predictable base drive sizing in saturated switch designs.
V_BE(sat)	1.3 V - Base-emitter saturation voltage at I_C = 150 mA, I_B = 15 mA; directly impacts base resistor selection and driver loading.

Pinout & Package

SOT-23 plastic surface-mount package (FS PKG Code 49), 3-pin, lead-free and RoHS-compliant. Marking "2F" identifies MMBT2907A variant. Thermal pad not present; collector terminal serves as primary heat path through PCB copper.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Emitter terminal	Current sink node in PNP configuration; connects to higher potential (e.g., V_CC) in common-emitter switch layouts.
2 (Base)	Control input	Receives negative base current to enable conduction; requires current-limiting resistor referenced to V_CC.
3 (Collector)	Output terminal	Drains load current to ground; electrically tied to PCB copper pour for thermal management per R_θJA = 357 °C/W spec.

Key Features

Feature	Design Value
High-speed switching	100 ns t_off and 45 ns t_on enable use in 5–10 MHz digital logic interfaces and PWM-driven loads.
Wide temperature range	−55°C to +150°C operating junction range supports automotive under-hood and industrial motor-control environments.
Low V_CE(sat)	0.4 V typical at I_C = 150 mA ensures <100 mW conduction loss in 5 V rail applications.
Robust breakdown ratings	60 V V_CEO/V_CBO allows direct replacement of legacy 2N2907A in 24 V control systems without snubbing.
SPICE-model ready	Published PSpice model (Is=650.6f, Bf=231.7, Tf=603.7p) enables accurate transient and thermal simulation pre-layout.

Applications

Logic Level Shifting	Relay Driver Circuit
Use Scenario: Converting 3.3 V microcontroller GPIO output to drive 5 V or 12 V logic inputs. IC Role / Device Role / Timing Role: PNP switch inverting level shifter with emitter tied to target rail, collector driving input load. Use Value: Delivers clean 100 ns edge transitions and supports >10 kHz toggle rates without propagation delay accumulation.	Use Scenario: Driving 12 V/50 mA electromagnetic relay coil from MCU GPIO. IC Role / Device Role / Timing Role: Saturated PNP switch with base resistor limiting I_B to 15 mA for β = 10 operation. Use Value: Achieves V_CE(sat) ≤ 0.4 V, minimizing coil power loss and enabling fast de-energization (t_s = 80 ns).
LED Current Sink	Discrete Inverter Stage
Use Scenario: Constant-current sinking for high-brightness indicator LEDs in automotive dashboards. IC Role / Device Role / Timing Role: Linear-mode current regulator using emitter degeneration resistor and V_BE reference. Use Value: Stable h_FE ≥ 100 across −40°C to +125°C ensures consistent LED brightness over temperature.	Use Scenario: Building non-inverting amplifier stages in analog sensor signal chains where CMOS op-amps are unavailable. IC Role / Device Role / Timing Role: Common-emitter amplifier with 200 MHz f_T and 30 pF C_ibo enabling 1–5 MHz small-signal gain. Use Value: Provides 10–20 dB mid-band gain with <0.5 dB flatness up to 2 MHz, verified via typical h_fe vs. frequency curves.

Logic Level Shifting

Relay Driver Circuit

Use Scenario: Converting 3.3 V microcontroller GPIO output to drive 5 V or 12 V logic inputs.

IC Role / Device Role / Timing Role: PNP switch inverting level shifter with emitter tied to target rail, collector driving input load.

Use Value: Delivers clean 100 ns edge transitions and supports >10 kHz toggle rates without propagation delay accumulation.

Use Scenario: Driving 12 V/50 mA electromagnetic relay coil from MCU GPIO.

IC Role / Device Role / Timing Role: Saturated PNP switch with base resistor limiting I_B to 15 mA for β = 10 operation.

Use Value: Achieves V_CE(sat) ≤ 0.4 V, minimizing coil power loss and enabling fast de-energization (t_s = 80 ns).

LED Current Sink

Discrete Inverter Stage

Use Scenario: Constant-current sinking for high-brightness indicator LEDs in automotive dashboards.

IC Role / Device Role / Timing Role: Linear-mode current regulator using emitter degeneration resistor and V_BE reference.

Use Value: Stable h_FE ≥ 100 across −40°C to +125°C ensures consistent LED brightness over temperature.

Use Scenario: Building non-inverting amplifier stages in analog sensor signal chains where CMOS op-amps are unavailable.

IC Role / Device Role / Timing Role: Common-emitter amplifier with 200 MHz f_T and 30 pF C_ibo enabling 1–5 MHz small-signal gain.

Use Value: Provides 10–20 dB mid-band gain with <0.5 dB flatness up to 2 MHz, verified via typical h_fe vs. frequency curves.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP general-purpose amplifier applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
PN2907A	TO-92 through-hole package; R_θJA = 200 °C/W; same V_CEO, I_C, and h_FE specs but slower t_off (200 ns).	Used where manual assembly or prototyping on breadboard/perfboard is required.	Select when board space permits larger footprint and thermal mass improves low-frequency stability.
BC807-40	SOT-23 package; V_CEO = 45 V; h_FE = 250–630 (min 40); lower V_CE(sat) (0.3 V) but reduced voltage margin.	Preferred in 3.3 V/5 V logic systems where 45 V rating suffices and higher gain reduces base drive burden.	Choose for compact designs needing tighter h_FE tolerance and lower saturation loss below 45 V operation.

Compared with PN2907A, MMBT2907 offers superior high-frequency response and smaller footprint but requires careful PCB thermal design due to higher R_θJA; versus BC807-40, it trades higher voltage capability and wider temp range for lower gain and higher V_CE(sat).

Availability

MMBT2907 is available at Aetrix Electronics and suitable for relay drivers, LED current sinks, logic-level shifters, and discrete inverter stages requiring stable component supply across automotive, industrial control, and consumer electronics production.

Supply support for MMBT2907 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

Fairchild Semiconductor (now part of ON Semiconductor) is a global leader in power management and analog ICs, founded in 1957 and known for high-reliability discrete semiconductors and process innovation.

The MMBT2907 belongs to Fairchild's general-purpose PNP transistor family optimized for cost-sensitive, medium-speed switching and linear amplification in commercial and industrial equipment.

FAQ

What is the maximum continuous collector current for MMBT2907?

The MMBT2907 has an absolute maximum continuous collector current (I_C) of 800 mA at T_A = 25°C. However, for reliable operation with guaranteed h_FE ≥ 50 and V_CE(sat) ≤ 1.6 V, design limits should stay at or below 500 mA - especially when ambient temperature exceeds 50°C or PCB copper area is limited.

Does MMBT2907 have a built-in thermal pad or exposed collector tab?

No, the MMBT2907 in SOT-23 package does not feature an exposed thermal pad or metalized backside. Its collector terminal (Pin 3) is the primary thermal path, and effective heat dissipation relies on adequate PCB copper pour connected to that pin - as reflected in the specified R_θJA = 357 °C/W value for a 1.6" × 1.6" FR-4 board.

Can MMBT2907 replace 2N2907A in existing designs?

Yes, MMBT2907 is a direct SOT-23 surface-mount functional replacement for the through-hole 2N2907A, sharing identical V_CEO, V_CBO, I_C, and h_FE specifications. Layout changes are required due to different package (SOT-23 vs TO-92), and thermal design must account for higher R_θJA (357 vs 200 °C/W).

What is the polarity convention for MMBT2907 voltage and current ratings?

All voltage and current ratings for the MMBT2907 follow PNP transistor convention: voltages (V_CEO, V_CBO, V_EBO) are negative with respect to ground, and currents (I_C, I_B, I_E) flow into the emitter and out of collector/base. Datasheet values are stated as magnitudes, but circuit analysis must apply negative polarity for correct biasing.

Where can I find the SPICE model for MMBT2907?

A verified PSpice model for MMBT2907 is published in the official Fairchild datasheet: Is=650.6f, Bf=231.7, Tf=603.7p, with full parameter set including Cjc, Cje, Vaf, and Xtb. This model is validated against measured f_T, C_obo, and switching waveforms - and is directly usable in LTspice, PSpice, and SIMetrix simulations of MMBT2907-based circuits.

MMBT2907 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Obsolete

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 800 mA

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

Vce Saturation (Max) @ Ib, Ic:: 1.6V @ 50mA, 500mA

Current - Collector Cutoff (Max):: 20nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 100 @ 150mA, 10V

Power - Max:: 350 mW

Frequency - Transition:: -

Operating Temperature:: -55°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBT2907 FAQ

1.How can I place an order for MMBT2907 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBT2907 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 MMBT2907 reliable?

The price and inventory of MMBT2907 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBT2907 is usually 5 days.

3.What payment methods are accepted for MMBT2907?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBT2907 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBT2907?

MMBT2907 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBT2907 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 MMBT2907?

For technical support, including MMBT2907 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBT2907 requirements.

6.How does Aetrix verify that MMBT2907 is sourced from the original manufacturer or authorized distributors?

All MMBT2907 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 MMBT2907 meets industry standards.

7.What is the process for return or replacement of MMBT2907?

All MMBT2907 units undergo pre-shipment inspection (PSI). If there is an issue with MMBT2907, 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 MMBT2907 part is unused and in its original packaging.

Return procedure for MMBT2907:

1.Submit a request within 90 days.

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

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