Infineon Technologies MMBTA92LT1

Overview

MMBTA92LT1 from Infineon Technologies is a PNP silicon high-voltage bipolar junction transistor (BJT) designed for video output stages in TV sets and switching power supplies. It features V_CEO = 300 V, V_CBO = 300 V, I_C = 500 mA, V_CE(sat) = 0.5 V at I_C = 20 mA / I_B = 2 mA, and f_T = 50 MHz.

For engineers reviewing the MMBTA92LT1 datasheet, MMBTA92LT1 pinout, MMBTA92LT1 application, or MMBTA92LT1 equivalent, key selection criteria include high-voltage blocking capability, low saturation voltage under moderate drive, thermal performance in SOT23, and complementary pairing with NPN MMBT42 for push-pull topologies.

Technical Context

This PNP BJT operates in linear or switching mode with guaranteed breakdown ratings up to 300 V across both collector–emitter and collector–base junctions. Its h_FE ranges from 25 to 40 at I_C = 1–30 mA and V_CE = 10 V, supporting stable current amplification in high-impedance bias networks.

The device exhibits C_cb = 6 pF at V_CB = 20 V and f = 1 MHz, and delivers f_T = 50 MHz at I_C = 20 mA / V_CE = 10 V - enabling use in medium-frequency switching and video signal buffering where gain-bandwidth trade-offs are critical.

Key Specifications

Pinout & Package

SOT23 surface-mount package with gull-wing leads; compact 2.9 mm × 1.3 mm footprint; JEDEC MO-215 compliant; marked "s2D" for identification.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BC807-40LT1G and ZTX951, MMBTA92LT1 uniquely balances 300 V capability, SOT23 footprint, and 500 mA rating - making it optimal for space-constrained, medium-power HV switching where leaded alternatives are unacceptable and lower-voltage BJTs lack margin.

Availability

MMBTA92LT1 is available at Aetrix Electronics and suitable for TV video output stages, switching power supplies, complementary push-pull amplifiers, and high-voltage signal buffers requiring stable component supply and RoHS-compliant manufacturing.

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

Infineon Technologies AG is a German semiconductor manufacturer specializing in power management, automotive ICs, and discrete power devices, with global R&D and wafer fabrication infrastructure.

The MMBTA92LT1 belongs to Infineon's high-voltage bipolar transistor product line, engineered specifically for reliability-critical analog video and energy-efficient offline power conversion applications.

FAQ

What is the maximum safe operating voltage for MMBTA92LT1 in continuous DC mode?

The absolute maximum collector–emitter voltage (V_CEO) is 300 V at T_j = 25 °C. Derating applies above 25 °C: V_CEO decreases by ~0.5 V/°C. For reliable long-term operation, design margins should limit steady-state V_CE to ≤240 V at 100 °C junction temperature, especially under inductive load conditions.

Can MMBTA92LT1 be used as a direct replacement for SMBTA92?

Yes - MMBTA92LT1 and SMBTA92 share identical electrical specifications, pinout (SOT23, pin 1 = B, pin 2 = E, pin 3 = C), and thermal ratings. The "MM" prefix denotes tape-and-reel packaging per JEDEC standards, while "SMB" indicates bulk or different reel size; both are functionally and mechanically interchangeable in PCB layout.

Does MMBTA92LT1 require a heatsink in typical SMT applications?

No external heatsink is required for continuous operation at ≤200 mW dissipation on standard 1-oz FR-4 with 100 mm² copper pad. At full-rated 360 mW, junction temperature rises ~76 °C above solder point (R_thJS ≤ 210 K/W); thermal relief vias and 200 mm² copper pour are recommended to maintain T_j < 125 °C.

How does the AEC-Q101 qualification impact usage in industrial equipment?

AEC-Q101 qualification confirms MMBTA92LT1 has passed accelerated stress tests including HTGB, HTRB, and temperature cycling - demonstrating robustness beyond standard industrial grade. This provides design margin for equipment operating in wide ambient ranges (−40 °C to +105 °C) and subject to vibration or thermal shock, though formal automotive system certification requires additional system-level validation.