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

onsemi MMBTA92LT1

Name: MMBTA92LT1
Brand: onsemi
SKU: MMBTA92LT1
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MMBTA92LT1

Manufacturer:: onsemi

Category:: Single Bipolar Transistors

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

Datasheet:: MMBTA92LT1.pdf

Description:: TRANS PNP 300V 0.5A SOT23-3

Quantity:: RFQ Add To RFQ list

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Product details

Overview

MMBTA92LT1 from onsemi is a PNP silicon small-signal transistor designed for high-voltage switching and amplification in space-constrained circuits. It features −300 V_CEO, −500 mA I_C, 25–40 h_FE at −1 mA, −0.5 V V_CE(sat) at −20 mA/−2 mA, and 50 MHz f_T, enabling use in flyback snubbers, relay drivers, and HV bias networks.

For engineers reviewing the MMBTA92LT1 datasheet, pinout, applications, or equivalent options, key selection criteria include its SOT-23 package, −300 V breakdown rating, low saturation voltage under moderate drive, thermal derating behavior on FR-5 board, and AEC-Q101 qualification status for automotive-grade reliability validation.

Technical Context

This PNP bipolar junction transistor operates with emitter-grounded configuration and supports linear amplification and saturated switching. Its high V_CEO and V_CBO (both −300 V) allow safe operation in circuits with large transient voltages, while its f_T of 50 MHz enables stable gain up to mid-VHF frequencies.

The device uses planar epitaxial construction with Pb-free, halogen-free packaging compliant with RoHS and AEC-Q101. Thermal resistance is 556 °C/W on FR-5 board and 417 °C/W on alumina substrate, requiring careful layout for power dissipation above 100 mW in continuous operation.

Key Specifications

Parameter	Value and Actual Design Meaning
V_CEO	−300 V - Supports switching in circuits with up to 300 V collector-to-emitter reverse potential without breakdown.
I_C (max)	−500 mA - Enables driving loads such as relays, LEDs, or gate resistors in HV auxiliary supplies.
h_FE	25–40 @ −1 mA - Provides predictable DC current gain for biasing and low-current amplification stages.
V_CE(sat)	−0.5 V @ −20 mA/−2 mA - Minimizes conduction loss in saturated switch applications, reducing heat generation.
f_T	50 MHz - Allows stable small-signal amplification up to ~10–20 MHz in practical designs with margin.
R_JA (FR-5)	556 °C/W - Limits usable continuous power to ~225 mW at 25°C ambient; requires thermal relief above 70°C ambient.
V_EBO	−5.0 V - Constrains base-emitter reverse bias to ≤5 V, necessitating clamping in inductive turn-off paths.

Pinout & Package

MMBTA92LT1 is housed in a SOT-23 (TO-236AF) plastic surface-mount package (Case 318, Style 6), measuring 2.90 × 1.30 × 1.00 mm with 1.90 mm lead pitch. It is rated for reflow soldering per J-STD-020 and qualified to MSL Level 1.

Pin/Terminal	Circuit Role	Design Meaning
1	Base	Control terminal; requires current-limited drive (typically −2 mA for 20 mA collector sink) to ensure saturation.
2	Emitter	Common reference node; connected to higher-potential rail in PNP high-side switch configurations.
3	Collector	Output terminal; sinks current from load to emitter; must withstand full system voltage during off-state.

Key Features

Feature	Design Value
High-voltage capability	−300 V V_CEO/V_CBO enables direct replacement of older high-voltage transistors in legacy power supply feedback and protection circuits.
AEC-Q101 qualification	Validated for automotive temperature range (−55°C to +150°C) and stress testing, supporting under-hood and body-control module deployment.
Pb-free & RoHS compliance	Meets global environmental regulations without compromising solderability or long-term reliability in automated assembly lines.
Low V_CE(sat)	−0.5 V at rated I_C/I_B reduces power loss by >30% versus comparable −300 V PNP devices with >−0.7 V saturation.

Applications

Switch-Mode Power Supply Feedback	Flyback Converter Snubber
Use Scenario: Isolating optocoupler feedback signals across primary-secondary boundaries in offline AC/DC converters. IC Role / Device Role / Timing Role: PNP transistor acting as a level-shifting current sink to drive optocoupler LED from secondary-side error amplifier output. Use Value: −300 V rating prevents breakdown during line transients; low V_CE(sat) ensures minimal voltage drop across opto-LED series resistor.	Use Scenario: Clamping voltage spikes across transformer windings during MOSFET turn-off in discontinuous conduction mode flyback topologies. IC Role / Device Role / Timing Role: Fast-switching PNP used in passive RCD snubber network to absorb leakage inductance energy. Use Value: 50 MHz f_T and low C_cb (6.0 pF) support clean turn-on/turn-off edges, minimizing snubber losses and EMI generation.
Automotive Relay Driver	High-Voltage Bias Network
Use Scenario: Driving 12 V or 24 V automotive relays from microcontroller GPIO pins in body control modules. IC Role / Device Role / Timing Role: High-side PNP switch controlling relay coil current path to battery rail, with base driven via current-limiting resistor. Use Value: AEC-Q101 qualification ensures robustness against load dump pulses and extended temperature cycling; −500 mA rating covers typical relay coils up to 500 Ω.	Use Scenario: Providing stable bias current to high-voltage op-amps or comparators in industrial sensor front-ends operating from ±150 V rails. IC Role / Device Role / Timing Role: Constant-current source configured with emitter resistor to set precise bias current independent of supply variation. Use Value: Tight h_FE spread (25–40) and low I_CBO (<−0.25 μA) maintain bias stability over temperature and time in precision analog circuits.

Switch-Mode Power Supply Feedback

Flyback Converter Snubber

Use Scenario: Isolating optocoupler feedback signals across primary-secondary boundaries in offline AC/DC converters.

IC Role / Device Role / Timing Role: PNP transistor acting as a level-shifting current sink to drive optocoupler LED from secondary-side error amplifier output.

Use Value: −300 V rating prevents breakdown during line transients; low V_CE(sat) ensures minimal voltage drop across opto-LED series resistor.

Use Scenario: Clamping voltage spikes across transformer windings during MOSFET turn-off in discontinuous conduction mode flyback topologies.

IC Role / Device Role / Timing Role: Fast-switching PNP used in passive RCD snubber network to absorb leakage inductance energy.

Use Value: 50 MHz f_T and low C_cb (6.0 pF) support clean turn-on/turn-off edges, minimizing snubber losses and EMI generation.

Automotive Relay Driver

High-Voltage Bias Network

Use Scenario: Driving 12 V or 24 V automotive relays from microcontroller GPIO pins in body control modules.

IC Role / Device Role / Timing Role: High-side PNP switch controlling relay coil current path to battery rail, with base driven via current-limiting resistor.

Use Value: AEC-Q101 qualification ensures robustness against load dump pulses and extended temperature cycling; −500 mA rating covers typical relay coils up to 500 Ω.

Use Scenario: Providing stable bias current to high-voltage op-amps or comparators in industrial sensor front-ends operating from ±150 V rails.

IC Role / Device Role / Timing Role: Constant-current source configured with emitter resistor to set precise bias current independent of supply variation.

Use Value: Tight h_FE spread (25–40) and low I_CBO (<−0.25 μA) maintain bias stability over temperature and time in precision analog circuits.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MMBTA93LT1G	Lower V_CEO/V_CBO (−200 V), same SOT-23 package and pinout, identical thermal specs.	Suitable where system voltage remains below 200 V; not acceptable for 300 V+ designs like universal input SMPS.	Select when cost sensitivity outweighs need for 300 V margin and design headroom is sufficient.
ZTX951	Higher h_FE (100 min), TO-92 package, −300 V rating, but larger footprint and lower f_T (25 MHz).	Preferred in through-hole prototyping or legacy board upgrades where SOT-23 rework is impractical.	Choose for manual assembly or thermal mass requirements exceeding SOT-23 limits; verify PCB pad compatibility.

Compared with MMBTA92LT1, MMBTA93LT1G trades 100 V of breakdown margin for identical form factor and cost, while ZTX951 offers higher DC gain and thermal mass at the expense of board area and bandwidth-making MMBTA92LT1 optimal for compact, high-reliability 300 V switching where layout density and frequency response matter.

Availability

MMBTA92LT1 is available at Aetrix Electronics and suitable for switch-mode power supply feedback, flyback snubber networks, and automotive relay driver circuits requiring stable component supply, long-term lifecycle assurance, and automotive-grade traceability.

Supply support for MMBTA92LT1 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

onsemi (formerly ON Semiconductor) is a global semiconductor supplier specializing in energy-efficient power, analog, sensing, and connectivity solutions for automotive, industrial, cloud, and consumer markets.

The MMBTA92LT1 belongs to onsemi's high-voltage discrete transistor family, engineered for reliable switching and amplification in harsh environments-including automotive powertrain, industrial power conversion, and telecom infrastructure.

FAQ

What is the maximum collector-emitter voltage rating for MMBTA92LT1?

The MMBTA92LT1 has a guaranteed minimum V_CEO rating of −300 Vdc at I_C = −1.0 mAdc and I_B = 0. This rating is validated per JEDEC test conditions and applies across the full operating temperature range (−55°C to +150°C). Exceeding this voltage risks irreversible breakdown and permanent device failure.

Is MMBTA92LT1 suitable for automotive applications?

Yes, MMBTA92LT1 is AEC-Q101 qualified and PPAP capable, making it suitable for automotive applications including body control modules, lighting drivers, and power distribution units. The device undergoes stress testing for temperature cycling, humidity, mechanical shock, and high-temperature operating life per AEC standards.

What is the pin configuration of MMBTA92LT1 in the SOT-23 package?

The MMBTA92LT1 uses Style 6 pinout in the SOT-23 package: Pin 1 is Base, Pin 2 is Emitter, and Pin 3 is Collector. This configuration is confirmed in onsemi's mechanical drawings and marking diagrams, and matches standard PNP SOT-23 layouts used across their high-voltage transistor portfolio.

Does MMBTA92LT1 have RoHS and halogen-free compliance?

Yes, MMBTA92LT1 is Pb-free, halogen-free/BFR-free, and fully RoHS compliant per EU Directive 2011/65/EU. The "G" suffix in part numbers like MMBTA92LT1G explicitly denotes this compliance, and the device meets IPC/JEDEC J-STD-609 moisture sensitivity and reflow profile requirements.

What is the typical DC current gain (h_FE) of MMBTA92LT1 at low collector current?

The MMBTA92LT1 exhibits h_FE of 25–40 when tested at I_C = −1.0 mAdc and V_CE = −10 Vdc at 25°C. This range is specified in the Electrical Characteristics table and reflects production lot variation; design margins should account for minimum 25 gain in worst-case bias calculations.

MMBTA92LT1 Specifications

Product attributes: Attribute value

Manufacturer:: onsemi

Series:: -

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

Packaging:: Cut Tape (CT)

Product Status:: Obsolete

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

DC Current Gain (hFE) (Min) @ Ic, Vce:: 25 @ 1mA, 10V

Power - Max:: 225 mW

Frequency - Transition:: 50MHz

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-23-3 (TO-236)

MMBTA92LT1 FAQ

1.How can I place an order for MMBTA92LT1 through Aetrix?

Please submit a Request for Quotation (RFQ) for MMBTA92LT1 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 MMBTA92LT1 reliable?

The price and inventory of MMBTA92LT1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MMBTA92LT1 is usually 5 days.

3.What payment methods are accepted for MMBTA92LT1?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MMBTA92LT1 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MMBTA92LT1?

MMBTA92LT1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MMBTA92LT1 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 MMBTA92LT1?

For technical support, including MMBTA92LT1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MMBTA92LT1 requirements.

6.How does Aetrix verify that MMBTA92LT1 is sourced from the original manufacturer or authorized distributors?

All MMBTA92LT1 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 MMBTA92LT1 meets industry standards.

7.What is the process for return or replacement of MMBTA92LT1?

All MMBTA92LT1 units undergo pre-shipment inspection (PSI). If there is an issue with MMBTA92LT1, 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 MMBTA92LT1 part is unused and in its original packaging.

Return procedure for MMBTA92LT1:

1.Submit a request within 90 days.

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

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