STMicroelectronics TN1605H-8G

Overview

TN1605H-8G from STMicroelectronics is a high-temperature, 16 A RMS, 800 V repetitive peak off-state voltage SCR thyristor in D²PAK surface-mount package, featuring tight gate trigger current (5–8 mA), 500 V/μs dV/dt immunity at 150 °C, and 100 A/μs turn-on dI/dt for robust AC line switching in inrush limiting and crowbar protection circuits.

For engineers reviewing the TN1605H-8G datasheet, TN1605H-8G pinout, TN1605H-8G application, or TN1605H-8G equivalent, key selection criteria include thermal performance at Tj = 150 °C, gate sensitivity (IGT ≤ 8 mA), static noise immunity, and D²PAK thermal resistance (Rth(j-c) = 1.1 °C/W).

Technical Context

This SCR operates as a latching bidirectional switch for AC mains control, triggered by low-energy gate pulses and sustaining conduction until current falls below holding threshold (IH ≤ 30 mA). Its design targets thermally constrained SMD applications where junction temperature must reach 150 °C without derating.

It combines high blocking voltage (VDRM/VRRM = 800 V), high surge capability (ITSM = 177 A @ 8.3 ms), and fast turn-on dynamics (tgt = 1.9 μs) while maintaining gate robustness (VRGM = 5 V, PG(AV) = 1 W) - enabling compact, high-reliability crowbar and motor control circuits.

Key Specifications

Pinout & Package

The TN1605H-8G uses the D²PAK (TO-263) surface-mount package with three terminals: anode (A), cathode (K), and gate (G). The exposed metal tab is electrically connected to the anode and serves as primary thermal path.

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 STTH1605D, TN1605H-8G uniquely delivers 150 °C operation, 500 V/μs dV/dt, and precise 5–8 mA IGT - making it the only option among the three qualified for thermally aggressive, noise-immune AC line protection and inrush limiting.

Availability

TN1605H-8G is available at Aetrix Electronics and suitable for inrush current limiting, solid-state relay design, crowbar protection, and heating resistor control requiring stable component supply and long-term industrial availability.

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

TN1605H-8G belongs to ST's high-temperature SCR family, engineered specifically for robust, surface-mount AC power control in space-constrained industrial equipment where thermal resilience and noise immunity are critical.

FAQ

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

The datasheet specifies IT(RMS) = 16 A at TC = 134 °C with 180° conduction angle. Operation above this case temperature requires derating per Figure 2; at TC = 142 °C, IT(AV) drops to 6 A. Thermal design must ensure case temperature remains ≤134 °C under worst-case ambient and airflow conditions.

Can TN1605H-8G be used in phase-angle control applications?

No - TN1605H-8G is an SCR (unidirectional), not a TRIAC. It conducts only during positive half-cycles of AC. For full-wave phase control (e.g., dimming), a bidirectional device like a TRIAC or back-to-back SCRs is required. This part is intended for half-wave switching, crowbar, or DC bus discharge.

Is the D²PAK tab electrically isolated from the anode?

No - the exposed metal tab in the D²PAK package is internally connected to the anode (A) terminal. Layout must treat the tab as a live high-voltage node unless intentionally tied to system ground or isolated via insulating thermal pad and standoff mounting.

What gate drive circuit meets the 5–8 mA IGT requirement while ensuring reliability?

A 12 V pulse through a 1.5 kΩ resistor delivers ~8 mA, satisfying max IGT. Use a pulse width ≥20 μs and dIG/dt ≤ 0.2 A/μs (per datasheet). An optocoupler with 1 A CTR (e.g., MOC3021) driving a 1.2 kΩ resistor provides margin and isolation. Avoid constant DC gate bias - SCR latches once triggered.