Infineon Technologies SMBT 3904U E6327

Overview

SMBT3904UE6327 from Infineon Technologies is an NPN silicon switching transistor in SOT-23 package, rated for 40 V V_CEO, 200 mA I_C, and 330 mW P_tot at T_S ≤ 71°C. It delivers high DC current gain (h_FE = 100–300 at I_C = 10–100 mA), low V_CE(sat) (0.2–0.3 V), and f_T = 300 MHz - used in discrete logic-level switching, LED driver stages, and signal amplification in automotive body control modules.

For engineers reviewing the SMBT3904UE6327 datasheet, SMBT3904UE6327 pinout, SMBT3904UE6327 application, or SMBT3904UE6327 equivalent, key selection criteria include verified V_CE(sat) at 50 mA/5 mA drive, h_FE consistency across 0.1–100 mA I_C, thermal resistance R_thJS ≤ 240 K/W, and AEC-Q101 qualification for under-hood use.

Technical Context

This discrete NPN transistor operates as a saturated switch or small-signal amplifier with defined breakdown limits: V_(BR)CEO = 40 V, V_(BR)CBO = 60 V, and V_(BR)EBO = 6 V. Its dynamic performance includes f_T = 300 MHz at I_C = 10 mA/V_CE = 20 V and C_cb = 3.5 pF at V_CB = 5 V.

Switching behavior is characterized by t_d/t_r/t_f ≤ 35 ns each and t_stg ≤ 200 ns under standardized test conditions (V_CC = 3 V, I_C = 10 mA, I_B1 = I_B2 = 1 mA), with noise figure F = 5 dB at I_C = 100 µA/V_CE = 5 V.

Key Specifications

Pinout & Package

Supplied in JEDEC-standard SOT-23 (TO-236) plastic surface-mount package with gull-wing leads; moisture sensitivity level (MSL) per J-STD-020 not specified in source data.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar NPN switching transistor applications.

Compared with MMBT3904LT1G and BC847BW, the SMBT3904UE6327 uniquely combines AEC-Q101 qualification, 40 V V_CEO, and verified h_FE performance across 0.1–100 mA - making it the only option validated for safety-critical automotive switching where long-term parametric drift must be bounded.

Availability

SMBT3904UE6327 is available at Aetrix Electronics and suitable for automotive body control units, industrial PLC output stages, and medical diagnostic signal conditioning requiring stable component supply across extended temperature and lifecycle requirements.

Supply support for SMBT3904UE6327 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 SMBT3904 series belongs to Infineon's automotive-qualified bipolar transistor product line, designed specifically for robust, high-reliability switching in engine control, lighting, and body electronics systems.

FAQ

Is SMBT3904UE6327 pin-compatible with standard MMBT3904 variants?

Yes - SMBT3904UE6327 uses the standard SOT-23 pinout (1 = Base, 2 = Emitter, 3 = Collector) and shares identical mechanical footprint and solder pad layout with MMBT3904, BC847, and other industry-standard 3-pin NPN transistors in this package. No PCB redesign is needed for drop-in replacement.

What is the maximum junction temperature and how does it relate to derating?

The absolute maximum junction temperature T_j is 150°C. Derating begins at T_S = 71°C for the SOT-23 package, where P_tot linearly decreases from 330 mW to zero at 150°C. This corresponds to R_thJS ≤ 240 K/W, requiring board-level thermal design to maintain T_S ≤ 71°C under full load.

Does SMBT3904UE6327 support pulsed operation beyond its DC ratings?

Yes - permissible pulse load curves show P_tot(max)/P_tot(DC) reaches 10× at t_p = 10 µs (D = 0.01), enabling short-duration peak currents up to ~600 mA. Pulse operation must respect t_p < 300 µs and duty cycle D < 2% to avoid thermal runaway.

How does the AEC-Q101 qualification impact design validation?

AEC-Q101 qualification confirms successful completion of stress tests including HTGB, HTRB, temperature cycling, and ESD (HBM ≥ 2 kV). This eliminates need for customer-level reliability requalification in automotive applications and provides documented failure-rate data aligned with ISO/TS 16949 processes.