STMicroelectronics TN5050H-12WY

Overview

TN5050H-12WY from STMicroelectronics is an AEC-Q101-qualified automotive-grade thyristor (SCR) with 1200 V blocking voltage, 50 A RMS on-state current, and 200 A/µs critical dI/dt rating. It serves as a high-reliability AC power switch in battery chargers, renewable energy inverters, and solid-state relays-enabling robust overvoltage crowbar protection and AC-DC controlled rectification under harsh thermal and surge conditions.

For engineers reviewing the TN5050H-12WY datasheet, TN5050H-12WY pinout, TN5050H-12WY application, or TN5050H-12WY equivalent, key selection criteria include its 1500 V non-repetitive blocking capability, 0.3 °C/W junction-to-case thermal resistance, 1.55 V max on-state voltage at 100 A, 1000 V/µs dV/dt immunity, and TO-247 uninsulated package with tab-connected anode.

Technical Context

This SCR operates as a latching unidirectional power switch triggered by a 50 mA gate current. Its 1200 V repetitive off-state voltage and 1500 V non-repetitive symmetric blocking voltage support high-voltage AC line switching in industrial and automotive systems up to 150 °C junction temperature.

The device delivers 633 A non-repetitive surge current (8.3 ms) and sustains 200 A/µs turn-on di/dt without commutation failure. Its 0.88 V on-state threshold and 6 mΩ dynamic resistance minimize conduction losses in high-current phase-controlled rectifiers and welding equipment.

Key Specifications

Pinout & Package

Delivered in TO-247 uninsulated package with electrically active tab (anode connection). Mounting torque: 0.8 N·m nominal, 1.0 N·m maximum. Epoxy meets UL 94 V0 flammability rating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IXYS MCR100-12IO1 and Littelfuse S4006L, TN5050H-12WY uniquely combines AEC-Q101 qualification, 1200 V blocking, and 50 A RMS in a single TO-247 package-making it the only option validated for automotive battery charger main switching and high-reliability industrial crowbar functions.

Availability

TN5050H-12WY is available at Aetrix Electronics and suitable for automotive battery chargers, renewable energy inverters, and industrial welding systems requiring stable component supply across extended product lifecycles.

Supply support for TN5050H-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 silicon solutions for automotive, industrial, and power applications.

TN5050H-12WY belongs to ST's high-voltage thyristor product line, engineered specifically for ruggedized AC power control in automotive electrification and industrial energy conversion systems.

FAQ

What is the maximum allowable gate trigger pulse width for TN5050H-12WY?

The absolute maximum gate pulse width is 20 µs at 8 A peak forward current (I_GM). Exceeding this risks irreversible gate junction damage. For reliable triggering, ST recommends 10 µs pulses with 200 mA minimum gate current and <100 ns rise time, as specified in Table 2 and Figure 10 of DS10561 Rev 6.

Can TN5050H-12WY be used in a common-cathode configuration?

No - the TO-247 package has an electrically active anode tab (A), making common-cathode configurations impractical without isolation barriers. The device is designed for common-anode topologies where the cathode (K) is the switched terminal and the anode connects directly to the high-side rail or heatsink.

What is the recommended minimum heatsink thermal resistance for continuous 50 A RMS operation?

At 50 A RMS and 137 °C case temperature, power dissipation reaches ~75 W (based on V_TM and R_D). With R_th(j-c) = 0.3 °C/W and max T_j = 150 °C, the heatsink must limit R_th(c-a) to ≤0.7 °C/W to keep ambient ≤50 °C - verified using Figure 2 and thermal curves on page 3 of DS10561 Rev 6.

Does TN5050H-12WY require a snubber circuit in AC line switching applications?

A snubber is mandatory when switching inductive loads or operating above 50% of rated dV/dt (i.e., >500 V/µs). The datasheet specifies 1000 V/µs minimum dV/dt immunity with gate open, but real-world EMI and stray inductance necessitate RC snubbers across A–K terminals per application note AN433 to prevent false turn-on during voltage transients.