Infineon Technologies SMBT3904UPNE6327HTSA1

Overview

SMBT3904UPNE6327HTSA1 from Infineon Technologies is an NPN silicon switching transistor in SOT23 package, rated for 40 V V_CEO, 200 mA I_C, and 330 mW P_tot at T_S ≤ 71°C, with h_FE = 100–300 (I_C = 10–100 mA), V_CE(sat) ≤ 0.3 V (I_C = 50 mA, I_B = 5 mA), used in low-voltage digital logic interface and signal switching circuits.

For engineers reviewing the SMBT3904UPNE6327HTSA1 datasheet, SMBT3904UPNE6327HTSA1 pinout, SMBT3904UPNE6327HTSA1 application, or SMBT3904UPNE6327HTSA1 equivalent, key selection criteria include DC current gain linearity across 0.1–100 mA, low saturation voltage under fast-switching loads, thermal resistance R_thJS ≤ 240 K/W, and AEC-Q101 qualification for automotive-grade reliability.

Technical Context

This discrete NPN transistor operates in active and saturation regions for digital on/off control and small-signal amplification. Its design emphasizes high h_FE consistency (min. 40 at I_C = 100 µA; min. 60 at I_C = 1 mA) and fast switching performance with t_d/t_r/t_f ≤ 35/35/50 ns under standardized test conditions (V_CC = 3 V, I_C = 10 mA).

Thermal behavior is defined by junction-to-solder-point resistance ≤240 K/W and derated power dissipation down to zero at T_S = 150°C. It supports pulse operation with duty cycle-dependent permissible load curves, validated per Infineon Application Note AN077.

Key Specifications

Pinout & Package

Package: SOT23 - Surface-mount plastic package with gull-wing leads, footprint compatible with JEDEC TO-236AB standard, optimized for automated assembly and thermal transfer via pad layout.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT3904LT1G and BC846B,215, SMBT3904UPNE6327HTSA1 uniquely combines AEC-Q101 qualification, 200 mA current capability, and tight V_CE(sat) spec-making it optimal for automotive and high-reliability industrial switching where both robustness and thermal efficiency are mandatory.

Availability

SMBT3904UPNE6327HTSA1 is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC input stages, and medical device power sequencing requiring stable component supply and long-term lifecycle support.

Supply support for SMBT3904UPNE6327HTSA1 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 is a German semiconductor manufacturer specializing in power management, automotive electronics, and industrial control ICs and discrete devices.

This part belongs to Infineon's "SMBT" series of automotive-qualified bipolar transistors, designed specifically for robust, high-volume switching in harsh-environment electronic control units.

FAQ

Is SMBT3904UPNE6327HTSA1 pin-compatible with standard MMBT3904 variants?

Yes-SMBT3904UPNE6327HTSA1 uses the standard SOT23-3 pinout (1=Base, 2=Emitter, 3=Collector) and shares identical mechanical footprint and soldering profile with MMBT3904 and other JEDEC TO-236AB-compliant NPN transistors, enabling drop-in replacement in most layouts.

What is the maximum allowable base current for continuous operation?

The absolute maximum base current is not explicitly specified, but design practice limits I_B to ≤10% of I_C to avoid secondary breakdown. At I_C = 200 mA, I_B should remain ≤20 mA; typical drive uses 1–5 mA for saturation, verified by V_CE(sat) ≤0.3 V in datasheet test conditions.

Does this transistor support pulsed operation beyond its DC ratings?

Yes-permissible pulse load curves in the datasheet define peak current and duration limits based on duty cycle and pulse width. At D = 0.01 and t_p = 100 µs, P_tot(max)/P_tot(DC) reaches ~5×, allowing short-duration 1 A pulses with proper thermal management and gate drive control.

How does its AEC-Q101 qualification impact reliability testing?

AEC-Q101 certification requires passing stress tests including HTOL (1000 hrs at 125°C), temperature cycling (−40°C to +125°C, 1000 cycles), and ESD (HBM ≥2 kV). This confirms suitability for automotive under-hood and cabin modules where failure modes must be statistically bounded over 15+ years.