Infineon Technologies SMBTA 92 E6433

Overview

SMBTA92 E6433 from Infineon Technologies is a PNP silicon high-voltage bipolar junction transistor (BJT) designed for switching and high-voltage amplification roles in video output stages and offline switch-mode power supplies. It features V_CEO = 300 V, I_C = 500 mA, h_FE ≥ 25 at I_C = 1 mA, V_CE(sat) ≤ 0.5 V at I_C = 20 mA/I_B = 2 mA, and SOT-23 package with pinout B-E-C.

For engineers reviewing the SMBTA92 E6433 datasheet, SMBTA92 E6433 pinout, SMBTA92 E6433 application, or SMBTA92 E6433 equivalent, key selection criteria include high-voltage blocking capability, low saturation voltage under moderate current, thermal resistance R_thJS ≤ 210 K/W, RoHS-compliant SOT-23 packaging, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This PNP BJT operates in common-emitter configuration with DC current gain h_FE ranging from 25 (min at I_C = 1 mA) to 40 (typ at I_C = 10 mA), supporting stable switching across 25–150 °C ambient. Its breakdown ratings-V_CEO = 300 V, V_CBO = 300 V, V_EBO = 5 V-enable use in flyback snubbers and horizontal deflection circuits where collector-to-emitter standoff exceeds 250 V.

The device exhibits f_T = 50 MHz at I_C = 20 mA/V_CE = 10 V and C_cb = 6 pF at V_CB = 20 V, confirming suitability for medium-frequency switching (≤100 kHz) rather than RF applications. Thermal derating follows P_tot = 360 mW at T_S ≤ 74 °C, with R_thJS ≤ 210 K/W enabling board-level thermal management without heatsinking in low-duty-cycle operation.

Key Specifications

Pinout & Package

Package: SOT-23 (TO-236AB), surface-mount, 3-pin plastic case with gull-wing leads. Dimensions per Infineon outline EHs BCW66; marking "s2D" on top surface.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBTA92, SMBTA92 E6433 offers identical performance in a different reel configuration; versus ZTX951, it trades higher minimum h_FE for lower thermal resistance and tighter AEC-Q101 validation-making it preferable for automotive and space-constrained industrial designs.

Availability

SMBTA92 E6433 is available at Aetrix Electronics and suitable for video output stages, switching power supplies, automotive lighting control, and industrial relay drivers requiring stable component supply across extended product lifecycles.

Supply support for SMBTA92 E6433 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 electronics, and industrial control ICs and discrete devices.

The SMBTA92 belongs to Infineon's high-voltage bipolar transistor product line, engineered for robustness in TV deflection, SMPS auxiliary regulation, and automotive body electronics where reliability under voltage stress is critical.

FAQ

Is SMBTA92 E6433 pin-compatible with SMBTA42?

No-SMBTA92 E6433 is a PNP transistor with pinout B-E-C (pin 1 = Base), while SMBTA42 is its complementary NPN counterpart with pinout E-B-C (pin 1 = Emitter). Swapping them without circuit revision causes polarity inversion and functional failure. Always verify pin mapping using the official Infineon SOT-23 outline diagram.

What is the maximum allowable base current for continuous operation?

The absolute maximum rated base current is 100 mA, but continuous operation above 10 mA risks thermal runaway due to β degradation at elevated junction temperatures. For reliable 24/7 operation, limit I_B to ≤ 5 mA with appropriate series base resistor and ensure T_J stays below 130 °C using the provided R_thJS and power dissipation curves.

Can SMBTA92 E6433 be used in linear amplifier applications?

It is not optimized for linear amplification: h_FE variation across I_C (25–40) and limited f_T (50 MHz) result in poor gain flatness and distortion above 100 kHz. Its design intent is saturated switching-not analog signal fidelity. Use dedicated RF or audio transistors like BC847 or MMBT5551 for linear gain stages.

Does SMBTA92 E6433 require a heatsink in typical applications?

No heatsink is required when operating within its 360 mW total power dissipation limit at T_S ≤ 74 °C. With R_thJS ≤ 210 K/W, a 1 cm² 1-oz copper pad beneath the SOT-23 package provides sufficient thermal path for most 500 mA pulsed or 200 mA continuous loads. Forced air or heatsinks become necessary only above 500 mW average dissipation.