STMicroelectronics TN3050H-12WY

Overview

TN3050H-12WY from STMicroelectronics is an AEC-Q101 qualified automotive-grade SCR thyristor rated for 30 A RMS on-state current, 1200 V repetitive off-state voltage (V_DRM/V_RRM), and 1400 V non-repetitive peak blocking voltage (V_DSM/V_RSM), operating up to 150 °C junction temperature. It delivers high noise immunity (1000 V/µs dV/dt), low gate trigger current (≤50 mA), and robust surge capability (300 A, 10 ms sine wave), enabling use in on-board battery chargers and solid-state AC relays.

For engineers reviewing the TN3050H-12WY datasheet, TN3050H-12WY pinout, TN3050H-12WY application, or TN3050H-12WY equivalent, key selection criteria include RMS current derating at elevated case temperature (30 A @ T_C = 126 °C), thermal resistance (R_th(j-c) = 0.8 °C/W), and gate sensitivity (I_GT ≤ 50 mA) under automotive thermal stress conditions.

Technical Context

This SCR operates as a unidirectional, gate-controlled power switch with latching behavior: once triggered, it remains conducting until current falls below the holding current (I_H ≤ 100 mA). Its critical dV/dt immunity (≥1000 V/µs at T_j = 150 °C) prevents false turn-on in noisy high-voltage AC environments such as motor soft-start circuits and UPS inverters.

The device uses a planar passivated silicon die in a TO-247 package with uninsulated tab (K-A-G-A-G-K configuration), where the metal tab serves as the anode (A), enabling direct heatsink mounting without isolation washers. Gate triggering is optimized for low-energy pulses (I_GM = 8 A, t_p = 20 µs) and exhibits stable I_GT and V_GT across –40 to +150 °C.

Key Specifications

Pinout & Package

Delivered in a through-hole TO-247 package with uninsulated metal tab (K-A-G-A-G-K pin sequence). The tab is electrically connected to the anode (A), requiring electrical isolation from heatsink unless system topology permits common-anode mounting.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar SCR thyristor applications.

Compared with MCR100-12 and S4006L, TN3050H-12WY uniquely combines AEC-Q101 qualification, 150 °C junction rating, and 1000 V/µs dV/dt immunity-enabling single-device deployment in harsh automotive and high-reliability industrial AC switching where thermal headroom and transient robustness are critical.

Availability

TN3050H-12WY is available at Aetrix Electronics and suitable for automotive on-board chargers, renewable energy inverters, and industrial welding systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for TN3050H-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.

TN3050H-12WY belongs to ST's high-voltage, high-current automotive SCR portfolio, engineered specifically for robust AC power control in electrified vehicle subsystems and industrial energy conversion systems.

FAQ

What is the maximum case temperature for continuous 30 A RMS operation?

The TN3050H-12WY supports 30 A RMS continuous conduction at a maximum case temperature (T_C) of 126 °C, as specified in the absolute ratings table. This requires a heatsink interface with thermal resistance ≤0.8 °C/W (junction-to-case) plus additional junction-to-ambient path to maintain T_j ≤150 °C under worst-case ambient conditions.

Can TN3050H-12WY be used in back-to-back configuration for AC switching?

Yes - the device is explicitly designed for dual back-to-back SCR configurations to implement fully controllable AC switches. Its 1400 V non-repetitive peak voltage rating and 1000 V/µs dV/dt immunity ensure reliable operation during reverse-biased half-cycles and transient overvoltages in solid-state relay applications.

Is the TO-247 tab electrically isolated?

No - the metal tab is uninsulated and internally connected to the anode (A). It must be electrically isolated from the heatsink using mica or ceramic washers unless the system architecture intentionally uses the tab as a common-anode node, such as in multi-SCR modules or symmetrical phase-control bridges.

What gate drive circuitry is recommended for automotive environments?

ST recommends using an optocoupler with minimum 5000 V_RMS isolation (e.g., PC817 or VO615A) driving a 33 Ω series resistor into the gate, delivering ≥10 mA I_GT pulse with <100 ns rise time. The gate should be clamped with a 1.3 V Zener to prevent overvoltage, and layout must minimize gate loop inductance to avoid false triggering from EMI.