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

Diodes Incorporated MMBTA92-7

Name: MMBTA92-7
Brand: Diodes Incorporated
SKU: MMBTA92-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBTA92-7

Manufacturer:: Diodes Incorporated

Category:: Single Bipolar Transistors

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

Datasheet:: MMBTA92-7.pdf

Description:: TRANS PNP 300V 0.5A SOT-23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBTA92-7 from Diodes Incorporated is a 300V PNP small-signal transistor in SOT-23 package, rated for −300V V_CEO, −500mA I_C, and 300mW power dissipation, with h_FE = 25–40 at −10mA/−10V, used in medium-power switching and amplification circuits in industrial power supplies and relay drivers.

For engineers reviewing the MMBTA92-7 datasheet, MMBTA92-7 pinout, MMBTA92-7 application, or MMBTA92-7 equivalent, key selection criteria include high-voltage PNP switching capability, AEC-Q101 qualification for automotive-grade reliability, thermal performance on FR4 PCBs, and complementary pairing with MMBTA42 in push-pull configurations.

Technical Context

This PNP bipolar junction transistor operates with reverse-biased collector-base and emitter-base junctions up to −300V and −5V respectively, supporting stable cutoff under high-voltage bias conditions. Its f_T of 50MHz enables use in audio-frequency amplification and fast-switching applications up to ~100kHz.

Designed for operation across −55°C to +150°C, it delivers consistent h_FE and V_CE(SAT) (≤ −0.5V at −20mA/−2mA) over temperature, with ESD robustness (4kV HBM) suitable for automated assembly and field-reliable deployment.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−300V: Enables safe operation in 240VAC-derived rails and flyback snubber circuits.
I_C	−500mA: Supports medium-current load switching (e.g., solenoids, LED strings, small relays).
P_D	300mW: Requires minimal heatsinking on standard 1oz FR4; derates linearly above 25°C ambient.
h_FE	25–40 @ −10mA/−10V: Provides predictable current gain for fixed-bias or emitter-follower driver stages.
f_T	50MHz: Sufficient for audio preamplifiers and PWM gate driving up to ~100kHz without phase lag.
R_θJA	417°C/W: Confirms thermal limit of +150°C junction at ≤ 70°C ambient with no added copper area.
ESD HBM	4000V: Meets IEC 61000-4-2 Level 4; withstands handling without special ESD controls.

Pinout & Package

SOT-23 plastic surface-mount package (3-pin, 2.9mm × 1.3mm × 1.0mm), lead-free and halogen-free, UL 94V-0 rated, moisture sensitivity level 1.

Pin/Terminal	Circuit Role	Design Meaning
1 (Emitter)	Current source terminal for PNP operation	Connected to higher potential rail; carries full load current in switching mode.
2 (Base)	Control input for minority-carrier injection	Requires −2mA drive for full saturation at −20mA collector load; low-impedance control node.
3 (Collector)	Current sink terminal	Connected to load return path; withstands −300V reverse bias during inductive turn-off.

Key Features

Feature	Design Value
AEC-Q101 qualified	Validated for automotive underhood applications including engine control modules and body electronics.
V_CEO > −300V	Eliminates need for external voltage clamping in 240VAC line-powered industrial controls.
Complementary to MMBTA42	Enables matched PNP/NPN pairs in Class-B audio amps, H-bridge drivers, and differential switches.
Green compound (Br+Cl <1500ppm)	Complies with IPC-1752A material declaration requirements for RoHS 2 and ELV directives.

Applications

Industrial Relay Driver

AC Line-Switched Power Supply

Use Scenario: Driving 12V/24V electromagnetic relays from microcontroller GPIO pins in PLC I/O modules.

IC Role / Device Role / Timing Role: PNP switch providing high-side current sourcing to relay coil with fast turn-on/turn-off.

Use Value: −300V V_CEO safely absorbs inductive kickback; −0.5V V_CE(SAT) minimizes coil power loss at 20mA drive.

Use Scenario: Snubber transistor in flyback converter auxiliary winding clamp circuits operating from 240VAC rectified input.

IC Role / Device Role / Timing Role: High-voltage PNP clamp limiting peak voltage across primary MOSFET during reset.

Use Value: −300V breakdown rating eliminates need for Zener+diode clamp network; SOT-23 footprint saves board space.

Automotive Body Control Unit

LED String Current Regulator

Use Scenario: Controlling door lock actuators and interior lighting loads in AEC-Q101-compliant BCM designs.

IC Role / Device Role / Timing Role: Medium-power load switch interfacing MCU outputs to 12V vehicle bus.

Use Value: PPAP-capable qualification ensures traceable manufacturing; −500mA I_C supports dual-lamp loads.

Use Scenario: Constant-current sink for 3–5 white LEDs in signage or backlighting powered from 12V supply.

IC Role / Device Role / Timing Role: Linear current regulator using emitter resistor feedback and base bias network.

Use Value: Stable h_FE over −40°C to +85°C ensures ±5% current accuracy; 300mW rating allows 20mA × 12V drop without heatsink.

Equivalent & Alternatives

The following parts are listed as comparable options for similar PNP high-voltage switching applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
BC807-40,115 (Nexperia)	V_CEO = −45V, I_C = −500mA, h_FE = 250–630 - lower voltage rating, higher gain	Not suitable for >60V rail applications; requires redesign for snubber or AC-line use	Select only for low-voltage DC systems where gain stability matters more than breakdown margin.
PN2907A (ON Semiconductor)	V_CEO = −60V, TO-92 package, PD = 625mW - larger footprint, lower voltage, higher power	Incompatible with SOT-23 layout; unsuitable for space-constrained automotive modules	Choose when board real estate permits through-hole mounting and higher dissipation is needed at <60V.

Compared with BC807-40 and PN2907A, MMBTA92-7 uniquely combines SOT-23 miniaturization, −300V ruggedness, and AEC-Q101 compliance-making it the only option for compact, high-voltage, automotive-qualified PNP switching in modern embedded power stages.

Availability

MMBTA92-7 is available at Aetrix Electronics and suitable for industrial relay drivers, AC line-switched power supplies, automotive body control units, and LED string regulators requiring stable component supply across extended temperature and high-reliability environments.

Supply support for MMBTA92-7 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

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, serving industrial, computing, consumer, and automotive markets with high-reliability components.

The MMBTA92 belongs to Diodes' high-voltage small-signal transistor product line, engineered specifically for robust switching and amplification in space-constrained, high-reliability applications such as automotive body electronics and industrial power interfaces.

FAQ

What is the maximum continuous collector current for MMBTA92-7 at 100°C ambient?

At T_A = 100°C, the device's power dissipation derates to approximately 150mW (per Fig. 1). With V_CE(SAT) ≤ −0.5V, the practical continuous I_C is limited to ≤ −300mA to maintain junction temperature below 150°C on standard FR4 layout.

Is MMBTA92-7 pin-compatible with MMBTA42?

No - MMBTA92-7 (PNP) and MMBTA42 (NPN) share identical SOT-23 pinout (Emitter-Base-Collector), but their polarity and biasing requirements differ. They are complementary in function, not drop-in replacements; circuit topology must be inverted for NPN use.

Does MMBTA92-7 require a base resistor in switching applications?

Yes - a series base resistor is mandatory to limit I_B and ensure saturation. For −20mA I_C, a 4.7kΩ resistor from a 5V logic source provides −1mA I_B, satisfying the −2mA requirement specified in the datasheet for guaranteed V_CE(SAT).

Can MMBTA92-7 be used in linear amplifier configurations?

Yes - its h_FE stability (25–40) and f_T = 50MHz support Class-A audio preamplifier stages and emitter-follower buffers. However, thermal derating must be applied: at 100mW dissipation, maximum linear I_C is ~10mA to avoid thermal runaway on FR4.

MMBTA92-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

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

Packaging:: Tape & Reel (TR)

Product Status:: Discontinued at Digi-Key

Transistor Type:: PNP

Current - Collector (Ic) (Max):: 500 mA

Voltage - Collector Emitter Breakdown (Max):: 300 V

Vce Saturation (Max) @ Ib, Ic:: 500mV @ 2mA, 20mA

Current - Collector Cutoff (Max):: 250nA (ICBO)

DC Current Gain (hFE) (Min) @ Ic, Vce:: 25 @ 30mA, 10V

Power - Max:: 300 mW

Frequency - Transition:: 50MHz

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

Grade:: Automotive

Qualification:: AEC-Q101

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3

MMBTA92-7 FAQ

1.How can I place an order for MMBTA92-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBTA92-7 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 MMBTA92-7 reliable?

The price and inventory of MMBTA92-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA92-7 is usually 5 days.

3.What payment methods are accepted for MMBTA92-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA92-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBTA92-7?

MMBTA92-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBTA92-7 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 MMBTA92-7?

For technical support, including MMBTA92-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA92-7 requirements.

6.How does Aetrix verify that MMBTA92-7 is sourced from the original manufacturer or authorized distributors?

All MMBTA92-7 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 MMBTA92-7 meets industry standards.

7.What is the process for return or replacement of MMBTA92-7?

All MMBTA92-7 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA92-7, 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 MMBTA92-7 part is unused and in its original packaging.

Return procedure for MMBTA92-7:

1.Submit a request within 90 days.

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

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