STMicroelectronics TN4050HP-12WY

Overview

TN4050HP-12WY from STMicroelectronics is an AEC-Q101-qualified automotive-grade SCR thyristor in TO-247 package, rated for 40 A RMS on-state current, ±1200 V repetitive off-state voltage, and 150 °C maximum junction temperature. It delivers high noise immunity (1000 V/µs), low on-state voltage (0.83 V at 150 °C), and robust surge capability (440 A, 8.3 ms) for high-reliability AC power switching in on-board chargers and crowbar protection circuits.

For engineers reviewing the TN4050HP-12WY datasheet, TN4050HP-12WY pinout, TN4050HP-12WY application, or TN4050HP-12WY equivalent, key selection criteria include dV/dt immunity at elevated temperature, thermal resistance (0.3 °C/W j-c), gate trigger current range (10–50 mA), and ECOPACK2 compliance for automotive supply chain traceability.

Technical Context

This SCR operates as a latching unidirectional power switch triggered by a positive gate pulse. Its design supports phase-controlled rectification and zero-crossing AC switching with verified hold/latch currents (IH ≤ 100 mA, IL ≤ 125 mA at 25 °C) and fast turn-on (1 µs typical gate trigger time) under high dV/dt stress (≥1000 V/µs at 150 °C).

Thermal performance is optimized for high-power density mounting: junction-to-case resistance is 0.3 °C/W (DC), enabling sustained 40 A RMS conduction at TC = 139 °C. The device sustains non-repetitive surges up to 440 A (8.3 ms) and 1400 V peak off-state voltage without failure.

Key Specifications

Pinout & Package

Delivered in TO-247 package with uninsulated metal tab (Tab = Anode). Package features UL 94 V0 epoxy, 0.8 N·m recommended mounting torque, and 4.43 g mass. Thermal pad is electrically connected to the anode terminal.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SCR-based AC switching applications.

Compared with MCR100-12 and S4065L, TN4050HP-12WY uniquely combines automotive qualification, 1200 V blocking, and TO-247 thermal performance-enabling single-device solutions in 6.6 kW OBCs and high-energy crowbar systems where reliability and surge margin are non-negotiable.

Availability

TN4050HP-12WY is available at Aetrix Electronics and suitable for on-board chargers, capacitor discharge units, and overvoltage crowbar protection circuits requiring stable component supply across automotive production lifecycles.

Supply support for TN4050HP-12WY 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

TN4050HP-12WY belongs to ST's high-voltage automotive SCR portfolio, engineered specifically for robust AC power control in electrified vehicle subsystems and industrial safety-critical protection circuits.

FAQ

What is the maximum allowable case temperature for continuous 40 A RMS operation?

The datasheet specifies that 40 A RMS conduction is guaranteed at TC = 139 °C with 180° conduction angle. Operation above this temperature requires derating per Figure 2; at TC = 150 °C, IT(AV) drops to ~28 A. Thermal design must ensure heatsink interface resistance keeps TC ≤ 139 °C under worst-case ambient and airflow conditions.

Can TN4050HP-12WY be used in bidirectional AC switching without a back-to-back configuration?

No - as a unidirectional SCR, TN4050HP-12WY conducts current only from anode to cathode when triggered. For full-wave AC switching, two devices must be connected in inverse-parallel (back-to-back), with isolated gate drives. Its internal structure lacks reverse-conducting capability.

Is the TO-247 metal tab electrically isolated from other terminals?

No - the metal tab is internally connected to the anode (A) terminal. This is explicitly stated in the "TO-247 uninsulated" designation and confirmed in the mechanical outline (Figure 12). Electrical isolation requires external insulating hardware (e.g., mica washer, silicone pad) between tab and heatsink.

What gate drive circuitry is recommended to ensure reliable turn-on across temperature?

A gate trigger pulse of ≥100 mA peak (2× IGT max), ≥10 µs width, and ≤1 µs rise time is recommended. Use a low-impedance driver (e.g., pulse transformer or dedicated SCR driver IC like TLP350) to overcome gate capacitance and maintain dI/dt > 0.2 A/µs, especially at low temperatures where IGT increases.