STMicroelectronics TN4050HA-12GY-TR

Overview

TN4050HA-12GY-TR from STMicroelectronics is an AEC-Q101 qualified automotive-grade silicon-controlled rectifier (SCR) in D²PAK package, rated 40 A RMS on-state current, 1200 V repetitive peak off-state voltage (VDRM/VRRM), and 1400 V non-repetitive surge voltage (VDSM/VRSM). It delivers 200 A/µs turn-on di/dt and 1500 V/µs off-state dv/dt immunity at 150 °C junction temperature, enabling robust AC switching in on-board chargers and solid-state relays.

For engineers reviewing the TN4050HA-12GY-TR datasheet, TN4050HA-12GY-TR pinout, TN4050HA-12GY-TR application, or TN4050HA-12GY-TR equivalent, key selection criteria include verified 40 A RMS current handling, 1200 V blocking capability at full temperature range, gate trigger current ≤50 mA, thermal resistance junction-to-case ≤0.5 °C/W, and D²PAK surface-mount compatibility for high-power compact PCB layouts.

Technical Context

This SCR operates as a unidirectional latching power switch with gate-controlled turn-on and natural commutation. Its design supports phase-controlled rectification, crowbar protection, and AC inrush limiting via precise gate triggering and high dv/dt immunity up to 1500 V/µs at Tj = 150 °C.

It features low on-state voltage (≤1.55 V at 50 A, 25 °C) and dynamic resistance (≤13 mΩ at 150 °C), enabling efficient conduction in high-current AC paths. The device sustains 400 A non-repetitive surge current for 10 ms and exhibits 800 A²s I²t rating for fusing protection.

Key Specifications

Pinout & Package

Supplied in D²PAK (TO-263) surface-mount package with isolated tab (anode-connected), optimized for thermal performance on PCBs or insulated metal substrates. Package dimensions per DS14002 Rev 1: 9.35 mm × 10.28 mm × 15.85 mm (L × W × H), 3-pin configuration.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STTH30L06D and MDA40A1200, TN4050HA-12GY-TR uniquely combines AEC-Q101 qualification, 1200 V blocking, D²PAK SMD packaging, and 0.5 °C/W thermal resistance-making it optimal for space-constrained, high-reliability automotive and industrial AC power control.

Availability

TN4050HA-12GY-TR is available at Aetrix Electronics and suitable for off-board chargers, renewable energy inverters, and uninterruptible power supplies requiring stable component supply, automotive-grade reliability, and high-voltage AC switching capability.

Supply support for TN4050HA-12GY-TR 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 designing and manufacturing microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

TN4050HA-12GY-TR belongs to ST's high-voltage automotive SCR product line, engineered specifically for robust AC power control in on-board chargers, solid-state relays, and battery energy systems demanding AEC-Q101 compliance and high dv/dt immunity.

FAQ

What is the maximum junction temperature and how does it affect conduction loss?

The TN4050HA-12GY-TR has a maximum junction temperature of 150 °C. At this temperature, its on-state voltage is ≤0.85 V and dynamic resistance is ≤13 mΩ, directly determining conduction loss (P = I² × R + I × V_TO). These values are specified in Table 4 of DS14002 and enable accurate thermal modeling for heatsink sizing.

Is the D²PAK package electrically isolated, and how should the tab be mounted?

The D²PAK tab is electrically connected to the anode terminal and is not internally isolated. When mounting, use an electrically insulating thermal pad or ceramic washer between the tab and heatsink unless the anode is referenced to system ground. Mechanical mounting must ensure uniform pressure across the tab surface to maintain thermal contact integrity.

Can this SCR replace a TRIAC in AC phase-control applications?

No-TN4050HA-12GY-TR is a unidirectional SCR and cannot conduct reverse current. For bidirectional phase control (e.g., dimmers, universal motor speed control), a back-to-back SCR pair or a TRIAC such as the BTA41-600B is required. This device is intended for half-wave or full-wave rectifier topologies where polarity is controlled externally.

What gate drive circuitry is recommended for reliable triggering?

A gate trigger pulse of ≥10 mA (min) and ≤50 mA (max) with ≥2 µs width and ≤1.3 V gate threshold is required. ST recommends using a dedicated SCR driver IC (e.g., MOC3021 optocoupler with zero-crossing detection or MOC3083 for random-phase) with series current-limiting resistor calculated per V_CC, V_GT, and I_GT to ensure consistent turn-on across temperature and aging.