STMicroelectronics STU13005N

Overview

STU13005N from STMicroelectronics is a high-voltage fast-switching NPN power transistor in IPAK (TO-251) package, rated for V_CEO = 400 V, I_C = 3 A, P_TOT = 30 W at T_C = 25 °C, with t_s = 0.8 µs and t_f = 150 ns under inductive load, used in AC-DC switch-mode power supplies.

For engineers reviewing the STU13005N datasheet, STU13005N pinout, STU13005N application, or STU13005N equivalent, this page delivers verified electrical ratings, thermal resistance (R_thJC = 4.2 °C/W), saturation voltage (V_CE(sat) = 0.5 V @ I_C = 1 A), DC current gain (h_FE = 15–30), and safe operating area data critical for SMPS design validation.

Technical Context

This NPN bipolar junction transistor employs multi-epitaxial planar technology with cellular emitter structure and planar edge termination to achieve wide RBSOA while enabling high-speed switching. Its design targets stable operation under repetitive inductive switching stress with V_clamp = 300 V and L = 50 mH.

It supports resistive-load switching with t_s = 1.65 µs and t_f = 260 ns at V_CC = 125 V, and features low dynamic parameter spread-critical for consistent performance across production batches in high-volume power supply manufacturing.

Key Specifications

Pinout & Package

STU13005N is housed in an IPAK (TO-251) surface-mount package with three terminals: Collector (pin 1), Base (pin 2), and Emitter (pin 3). The package features a single exposed metal tab (Collector-connected) for thermal and electrical mounting to PCB copper pour or heatsink.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STU13003N and BU508A, STU13005N offers optimal balance of 400 V blocking, 3 A current, and sub-microsecond switching-making it ideal for cost-sensitive yet performance-critical 65–100 kHz SMPS where thermal density and EMI control matter.

Availability

STU13005N is available at Aetrix Electronics and suitable for AC-DC flyback converters, industrial control power supplies, and LED driver power stages requiring stable component supply, long-term manufacturability, and RoHS-compliant sourcing.

Supply support for STU13005N 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

STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, digital, and mixed-signal ICs and discrete devices for industrial, automotive, and consumer markets.

STU13005N belongs to ST's high-voltage bipolar power transistor product line, engineered specifically for reliable, high-efficiency switching in offline power conversion systems up to 200 W.

FAQ

What is the recommended base drive configuration for STU13005N in a flyback converter?

STU13005N requires active base drive with peak current ≥500 mA for full 3 A switching. A dedicated base driver IC (e.g., STMicroelectronics TS391-based discrete driver or TC4427) is recommended to ensure fast turn-on/turn-off and avoid second breakdown. Base resistor values should be selected to deliver ≥200 mA DC bias at minimum input voltage, with clamping diodes to prevent negative V_BE overshoot.

Can STU13005N replace STU13005 in existing designs?

Yes-STU13005N is the current production version of STU13005, with identical electrical specifications, pinout, and package. The "N" suffix denotes RoHS-compliant ECOPACK® packaging and updated manufacturing process per DocID 022832 Rev 2 (May 2014); no redesign or qualification is required for drop-in replacement.

What is the maximum allowable case temperature for continuous operation?

Maximum case temperature is derived from P_TOT = 30 W and R_thJC = 4.2 °C/W: T_J = T_C + (P × R_thJC). To maintain T_J ≤ 150 °C, T_C must not exceed 150 − (30 × 4.2) = 24 °C at full power. For practical designs, T_C ≤ 85 °C is typical, requiring derating to ~14 W or use of thermal interface material and external heatsinking.

Does STU13005N require a snubber network in flyback applications?

A snubber is strongly recommended due to its 400 V V_CEO rating and inductive turn-off stress. With typical reflected output voltage (~135 V) plus leakage spike (~200–250 V), peak V_CE can approach or exceed 400 V. An RC clamp (e.g., 100 Ω + 1 nF) tied to primary winding and auxiliary winding improves reliability and reduces EMI without significant efficiency penalty.