Infineon Technologies BSP129L6327

Overview

BSP129L6327 from Infineon Technologies is an N-channel depletion-mode SIPMOS® small-signal transistor in PG-SOT223 package, rated for 240 V V_DS, 6 Ω R_DS(on) max at V_GS = 0 V, and 0.35 A continuous drain current at 25 °C ambient. It features dv/dt ruggedness up to 6 kV/µs, AEC-Q101 qualification, and V_GS(th) banding (L-band: −1.5 V to −1.3 V) for precision timing and analog switching in automotive sensor interfaces.

For engineers reviewing the BSP129L6327 datasheet, BSP129L6327 pinout, BSP129L6327 application, or BSP129L6327 equivalent, key selection criteria include its depletion-mode operation enabling zero-bias turn-on, high dv/dt immunity for noisy environments, V_GS(th) sorting for matched biasing, and SOT223 thermal performance with R_thJS = 25 K/W.

Technical Context

This device operates as a normally-on (depletion-mode) switch, requiring negative gate-source voltage to pinch off conduction-ideal for fail-safe bias networks and high-side load control where default-on behavior is required. Its 240 V breakdown and 6 kV/µs dv/dt rating support robust operation in inductive load switching and automotive body electronics.

The integrated reverse diode has 0.79 V typical forward voltage at 0.35 A and 53–80 ns reverse recovery time, enabling bidirectional current handling in flyback and snubber circuits without external diodes. Gate charge parameters (Q_g = 3.8–5.7 nC, Q_gd = 1.7–2.6 nC) indicate moderate switching speed suitable for <1 MHz PWM applications.

Key Specifications

Pinout & Package

Package: PG-SOT223 (standardized 4-pin variant with exposed drain pad; pin 4 is drain connection, pins 1–3 are source, gate, and source respectively).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar depletion-mode MOSFET applications.

Compared with BSP129H6327 and BS170, the BSP129L6327 offers superior dv/dt immunity and automotive qualification, while its L-band V_GS(th) provides higher gate voltage margin for stable turn-off in noisy environments-critical for body control modules.

Availability

BSP129L6327 is available at Aetrix Electronics and suitable for automotive door modules, industrial analog bias networks, LED current regulation, and power supply soft-start circuits requiring stable component supply with traceable lot control and AEC-Q101 compliance.

Supply support for BSP129L6327 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 power devices, with global manufacturing and automotive qualification infrastructure.

The SIPMOS® small-signal transistor product line delivers high-reliability depletion- and enhancement-mode MOSFETs optimized for automotive sensor interfaces, analog biasing, and fail-safe switching applications.

FAQ

Is BSP129L6327 a depletion-mode or enhancement-mode transistor?

BSP129L6327 is a depletion-mode N-channel MOSFET. It conducts current with zero gate-source voltage and requires a negative V_GS (down to −3 V) to fully turn off. This behavior is confirmed by its I_DSS = 50 mA minimum at V_GS = 0 V and V_GS(th) range of −1.5 V to −1.3 V.

What does the 'L6327' suffix indicate in BSP129L6327?

The 'L6327' suffix denotes two attributes: 'L' specifies the V_GS(th) band (−1.5 V to −1.3 V), and '6327' identifies the tape-and-reel packaging format (1000 pcs/reel, PG-SOT223, non-dry pack). This marking appears on the reel label and device top-side laser marking per Infineon's ordering system.

Can BSP129L6327 replace BS170 in existing designs?

BSP129L6327 is not a drop-in replacement for BS170 due to higher V_DS (240 V vs. 200 V), different V_GS(th) polarity (negative vs. positive), and stricter thermal requirements. While both are N-channel MOSFETs in SOT-223/SOT-23 packages, the BSP129L6327's depletion-mode operation demands redesign of gate biasing and protection networks.

Does BSP129L6327 require a heatsink in typical operation?

No external heatsink is required for BSP129L6327 at ≤0.28 A continuous drain current and 70 °C ambient, provided the PCB uses ≥6 cm² copper area per Infineon's thermal test condition. Its R_thJA drops to 70 K/W with that copper area, limiting junction temperature rise to <100 K under those conditions.