STMicroelectronics TN1605H-8T

Overview

TN1605H-8T from STMicroelectronics is a high-temperature, 800 V, 16 A RMS silicon-controlled rectifier (SCR) in TO-220AB package, designed for robust AC line switching and inrush current limiting. It delivers 100 A/µs dI/dt turn-on rise, 500 V/µs dV/dt immunity at 150 °C, and tight 5–8 mA gate trigger current spread-enabling compact, thermally resilient control circuits in industrial AC/DC converters.

For engineers reviewing the TN1605H-8T datasheet, TN1605H-8T pinout, TN1605H-8T application, or TN1605H-8T equivalent, key selection criteria include its 150 °C junction rating, 800 V repetitive blocking voltage, 100 A/µs dI/dt capability, and TO-220AB thermal resistance of 1.1 °C/W (junction-to-case), critical for crowbar protection and solid-state relay designs.

Technical Context

This SCR features a planar passivated junction structure optimized for high-temperature operation up to 150 °C, with static dV/dt immunity specified at 500 V/µs under worst-case conditions (Tj = 150 °C, VOUT = 536 V, gate open). Its latching and holding currents remain stable across temperature due to tightly controlled gate triggering parameters (IGT = 5–8 mA).

The device uses a low-threshold, low-dynamic-resistance design: VTO = 0.82 V and RD = 25 mΩ at 150 °C, enabling efficient conduction at high RMS loads. Its 177 A non-repetitive surge rating (tP = 8.3 ms) supports transient overload handling in motor start-up and power bus discharge applications.

Key Specifications

Pinout & Package

TO-220AB package with isolated tab (A), cathode (K), and gate (G) terminals. Mounting hole centered on tab; leads are lead-free and halogen-free per ECOPACK2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT169GW,112 and TYN616RG, the TN1605H-8T uniquely combines 150 °C operation, 800 V blocking, and 500 V/µs dV/dt-making it the only option for high-reliability inrush limiting and crowbar functions in thermally constrained industrial systems.

Availability

TN1605H-8T is available at Aetrix Electronics and suitable for inrush current limiting, solid-state relay implementation, and crowbar overvoltage protection requiring stable component supply and long-term industrial lifecycle support.

Supply support for TN1605H-8T 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, specializing in power, analog, MCU, and sensor technologies for industrial, automotive, and consumer markets.

The TN1605H-8T belongs to ST's high-temperature SCR family, engineered specifically for ruggedized AC power control in harsh thermal and electrical environments-targeting industrial motor drives, UPS systems, and programmable logic controller outputs.

FAQ

What is the maximum allowable gate trigger pulse width for TN1605H-8T?

The datasheet specifies a peak gate current (IGM) limit of 4 A for tp = 20 µs at Tj = 150 °C. Exceeding this duration risks gate junction overheating. For reliable triggering, use pulses ≤10 µs with 12 mA minimum amplitude, as validated in the tgt test condition (1.9 µs typical turn-on delay).

Can TN1605H-8T be used in DC applications?

Yes-it supports DC switching when used with forced commutation or series inductive loads. Its VDSM/VRSM rating is 900 V, and it sustains 16 A RMS in DC mode with appropriate heatsinking. However, zero-crossing turn-off does not occur in pure DC, so external commutation circuitry is required for controlled turn-off.

Is the TO-220AB tab electrically isolated?

Yes-the TO-220AB package used for TN1605H-8T has an electrically isolated anode tab. The tab connects solely to the anode (A) terminal and must be insulated from the heatsink using a mica or polymer washer to prevent short circuits in grounded-chassis designs.

What is the recommended gate resistor value for microcontroller-driven operation?

With VCC = 5 V and IGT(max) = 8 mA, a 470 Ω series resistor limits gate current to ~10.6 mA-within PG(AV) = 1 W and IGM = 4 A limits. This value also damps ringing and ensures clean triggering at 150 °C, as confirmed by dV/dt immunity testing with RL = 33 Ω.