Infineon Technologies SMBT3904E6327HTSA1

Overview

SMBT3904E6327HTSA1 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 SMBT3904E6327HTSA1 datasheet, SMBT3904E6327HTSA1 pinout, SMBT3904E6327HTSA1 application, or SMBT3904E6327HTSA1 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 NPN transistor operates in active and saturation regions with defined breakdown limits: V_(BR)CEO = 40 V, V_(BR)CBO = 60 V, and V_(BR)EBO = 6 V. Its switching performance is characterized by t_d/t_r/t_f ≤ 35/35/50 ns at I_C = 10 mA, enabling fast digital interface buffering and PWM-driven load control.

Thermal design is constrained by junction-to-solder-point resistance R_thJS ≤ 240 K/W (SOT-23), with derated power dissipation down to zero at T_S = 150°C. Noise figure is specified at 5 dB (I_C = 100 µA, f = 1 kHz), confirming suitability for low-noise pre-amplifier biasing where gain stability matters.

Key Specifications

Pinout & Package

Supplied in SOT-23 (TO-236) plastic surface-mount package with standard 3-pin configuration: emitter (pin 1), base (pin 2), collector (pin 3). Pin assignment matches JEDEC TO-236AB outline and supports automated placement and reflow soldering.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MMBT3904-7-F and BC846B,215, SMBT3904E6327HTSA1 uniquely combines AEC-Q101 qualification, 0.2 V typical V_CE(sat), and 240 K/W thermal resistance - making it optimal for space-constrained, thermally demanding automotive and industrial switching nodes.

Availability

SMBT3904E6327HTSA1 is available at Aetrix Electronics and suitable for automotive body control units, industrial sensor interfaces, LED driver stages, and power supply enable switches requiring stable component supply and long-term lifecycle support.

Supply support for SMBT3904E6327HTSA1 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 ICs, and discrete devices, with global manufacturing and quality certification to ISO/TS 16949.

SMBT3904E6327HTSA1 belongs to Infineon's "General Purpose Transistors" product line, designed specifically for reliable, high-volume switching in automotive and industrial environments where AEC-Q101 compliance and thermal robustness are mandatory.

FAQ

Is SMBT3904E6327HTSA1 pin-compatible with standard SOT-23 NPN transistors like MMBT3904?

Yes - SMBT3904E6327HTSA1 uses JEDEC-standard SOT-23 (TO-236AB) pinout: emitter (pin 1), base (pin 2), collector (pin 3). It shares identical footprint, solder pad layout, and mechanical dimensions with MMBT3904, enabling direct PCB replacement without layout modification.

What is the maximum allowable base current for safe operation at I_C = 100 mA?

At I_C = 100 mA and guaranteed h_FE ≥ 30 (min), the minimum required base current is 3.3 mA. The absolute maximum base current is limited by package power dissipation: with V_BE(sat) ≈ 0.85 V, I_B must stay below 30 mA to avoid exceeding P_tot = 330 mW in continuous operation.

Does SMBT3904E6327HTSA1 support operation at −40°C ambient temperature?

Yes - SMBT3904E6327HTSA1 is AEC-Q101 qualified with guaranteed electrical parameters from −55°C to +125°C junction temperature. At −40°C ambient and typical PCB thermal resistance, junction temperature remains within spec for continuous operation at rated I_C and V_CEO.

Can SMBT3904E6327HTSA1 be used in linear amplifier configurations?

It can operate in the active region, but is optimized for switching: its h_FE variation across I_C (40–300) and lack of specified linearity metrics (e.g., distortion, output impedance) make it less suitable than dedicated RF or audio transistors. Use only for non-critical, low-fidelity amplification where gain stability is not required.