STMicroelectronics TN1605H-8I

Overview

TN1605H-8I from STMicroelectronics is a high-temperature, insulated-packaged silicon-controlled rectifier (SCR) rated for 16 A RMS on-state current, 800 V repetitive peak off-state voltage (VDRM/VRRM), and 150 °C maximum junction temperature. It features tight gate trigger current spread (5–8 mA), 500 V/μs dV/dt immunity at 150 °C, and 100 A/μs turn-on di/dt-enabling robust inrush current limiting in AC/DC converters and crowbar protection circuits.

For engineers reviewing the TN1605H-8I datasheet, TN1605H-8I pinout, TN1605H-8I application, or TN1605H-8I equivalent, key selection criteria include its TO-220AB insulated package (2500 VRMS isolation), high thermal capability (Rth(j-c) = 2.2 °C/W), and trade-off between noise immunity and gate sensitivity for compact AC line control designs.

Technical Context

This SCR operates as a latching unidirectional power switch in AC phase-control and overvoltage protection topologies. Its static dV/dt immunity of 500 V/μs at Tj = 150 °C ensures reliable blocking under fast transients, while its 100 A/μs critical di/dt rating supports rapid turn-on without commutation failure in high-current crowbar circuits.

The device uses a planar passivated junction structure with halogen-free molding and lead-free plating (ECOPACK2 compliant). Its gate threshold voltage (VGT ≤ 1.3 V) and low holding current (IH ≤ 30 mA) enable compatibility with standard logic-level drivers and low-power gate circuits across industrial ambient temperatures (−40 to +150 °C).

Key Specifications

Pinout & Package

TO-220AB insulated package with creepage/clearance optimized for 2500 VRMS isolation per UL 1557. Mounting hole accepts M3 screw; recommended torque 0.4–0.6 N·m. Case is electrically isolated from all terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT169G and STTH1608D, TN1605H-8I uniquely delivers 16 A RMS handling, 800 V blocking, and 150 °C operation in an insulated TO-220AB package-making it the sole option among the three for high-reliability, thermally demanding AC line switching and protection.

Availability

TN1605H-8I is available at Aetrix Electronics and suitable for inrush current limiting in AC/DC converters, solid-state relay modules, and crowbar overvoltage protection circuits requiring stable component supply and long-term industrial lifecycle support.

Supply support for TN1605H-8I 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 analog, power, MCU, and sensor solutions for industrial, automotive, and consumer markets.

TN1605H-8I belongs to ST's high-temperature SCR product line, engineered specifically for ruggedized AC line interface applications where thermal resilience, isolation integrity, and transient immunity are critical-such as industrial motor starters and telecom power protection.

FAQ

What is the maximum allowable case temperature for continuous 16 A RMS operation?

The datasheet specifies IT(RMS) = 16 A at TC = 118 °C. Exceeding this case temperature requires linear derating: at TC = 127 °C, IT(AV) drops to 8 A; at TC = 135 °C, it falls to 6 A. Thermal design must ensure case temperature remains ≤118 °C under worst-case ambient and airflow conditions.

Can TN1605H-8I be used in DC circuits?

Yes-it functions as a DC latching switch when triggered, but requires external commutation (e.g., series inductor or auxiliary switch) to force current below holding level (IH ≤ 30 mA) for turn-off. Not self-commutating like a MOSFET or IGBT; best suited for AC phase control or crowbar where natural current zero-crossing or active discharge occurs.

Is the TO-220AB insulation rated for reinforced insulation per IEC 60747-5-5?

No-the 2500 VRMS isolation rating complies with UL 1557 (reinforced insulation for basic safety), but IEC 60747-5-5 requires additional testing (e.g., partial discharge, impulse voltage) not claimed in the datasheet. For IEC-certified designs, verify system-level insulation coordination and consult ST's safety certification documentation.

Does the 500 V/μs dV/dt rating apply at all temperatures?

No-this value is guaranteed only at Tj = 150 °C. Figure 10 shows relative dV/dt immunity degrades to ~70% at Tj = 25 °C (≈350 V/μs). Designers must validate noise immunity at actual operating junction temperature, especially in low-Tj applications where gate sensitivity increases.