STMicroelectronics TN1605H-6T

Overview

TN1605H-6T from STMicroelectronics is a high-temperature, 16 A RMS silicon-controlled rectifier (SCR) in TO-220AB package, rated for 600 V repetitive peak off-state voltage (VDRM/VRRM), 6 mA gate trigger current (IGT), and operation up to 150 °C junction temperature. It delivers robust switching in motorbike voltage regulators, solid-state relays, and light dimmers where thermal resilience and noise immunity are critical.

For engineers reviewing the TN1605H-6T datasheet, TN1605H-6T pinout, TN1605H-6T application, or TN1605H-6T equivalent, key selection criteria include dV/dt immunity at 150 °C (200 V/μs), critical dI/dt rating (100 A/μs), on-state voltage (1.6 V max at 32 A), thermal resistance (1.1 °C/W j-c), and ECOPACK®2 compliance for lead-free assembly.

Technical Context

This SCR uses planar passivated silicon technology optimized for high-temperature reliability and surge robustness. Its gate structure enables low IGT (6 mA max) with stable triggering across -40 to +150 °C, while the dV/dt immunity remains ≥200 V/μs even at maximum Tj - critical for noisy industrial AC line environments.

The device supports 153 A non-repetitive surge current (tp = 8.3 ms) and exhibits low on-state dynamic resistance (25 mΩ max at 150 °C), enabling efficient conduction in motor control starters and inrush limiting circuits without external heatsink oversizing.

Key Specifications

Pinout & Package

TO-220AB package with insulated tab (NIns. & Ins.), 3-terminal configuration: Anode (A), Cathode (K), Gate (G). Mounting hole enables mechanical fixation and thermal interface to heatsink. Tab is electrically isolated from all terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT139-600E and TYN616, TN1605H-6T offers superior thermal headroom (150 °C vs. 125 °C), higher noise immunity at temperature, and lower gate drive burden - making it optimal for compact, sealed, or high-EMI motor control and regulation systems.

Availability

TN1605H-6T is available at Aetrix Electronics and suitable for motorbike voltage regulator circuits, inrush current limiting circuits, motor control circuits and starters, and solid-state relays requiring stable component supply across automotive, industrial, and lighting OEM programs.

Supply support for TN1605H-6T 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-6T belongs to ST's high-temperature SCR product line, engineered specifically for ruggedized AC power control in thermally constrained or EMI-intensive environments such as vehicle electrical systems and industrial automation.

FAQ

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

The datasheet specifies IT(RMS) = 16 A at Tc = 133 °C. This means the case must be maintained at or below 133 °C using appropriate heatsinking. Exceeding this temperature requires linear derating per Figure 2 - e.g., at Tc = 142 °C, IT(AV) drops to 6 A. Thermal design must account for Rth(j-c) = 1.1 °C/W and expected ambient conditions.

Can TN1605H-6T replace a standard 16 A SCR in an existing zero-crossing dimmer design?

Yes, provided the gate drive circuit delivers ≥6 mA pulse with <1.3 V gate threshold and the heatsink maintains Tc ≤133 °C. Its higher dV/dt immunity (200 V/μs at 150 °C) improves noise rejection over standard SCRs, but snubber design should still follow ST's AN434 guidelines to manage commutation stress in leading-edge phase control.

Is the TO-220AB package electrically insulated, and what is its isolation voltage rating?

Yes, the TO-220AB variant used in TN1605H-6T is the insulated (Ins.) version, with reinforced insulation between the metal tab and internal die. While ST does not specify a formal isolation voltage, the package meets UL 94 V0 flammability and is designed for functional isolation in 230 VAC applications - typical working voltage rating is 500 V RMS per IEC 60747-10.

Does TN1605H-6T require a heat sink in a 10 A RMS motor starter application at 40 °C ambient?

Yes. At 10 A RMS, power dissipation is ~16 W (using VTM ≈ 1.6 V). With Rth(j-c) = 1.1 °C/W and Rth(c-a) depending on heatsink size, junction temperature will exceed 150 °C without thermal management. A minimum 10 cm² aluminum heatsink (Rth(c-a) ≈ 20 °C/W) is recommended to keep Tj ≤135 °C under worst-case conditions.