STMicroelectronics TN1605H-8BTR

Overview

TN1605H-8BTR from STMicroelectronics is a high-temperature, 800 V, 16 A RMS SCR thyristor in DPAK package, designed for robust AC line switching and inrush current limiting. It features tight gate trigger current (2–6 mA), high dV/dt immunity (500 V/µs at 150 °C), and fast turn-on dI/dt (100 A/µs), enabling compact crowbar protection and motor control circuits in power tools and industrial drives.

For engineers reviewing the TN1605H-8BTR datasheet, TN1605H-8BTR pinout, TN1605H-8BTR application, or TN1605H-8BTR equivalent, key selection criteria include junction temperature rating (150 °C), repetitive peak off-state voltage (800 V), RMS on-state current (16 A), gate trigger current spread (2–6 mA), and thermal resistance (R_th(j-c) = 1.1 °C/W).

Technical Context

This SCR operates with a latching current ≤40 mA and holding current ≤20 mA at 25 °C, supporting reliable turn-on under low-gate-energy conditions. Its dynamic resistance (22 mΩ) and threshold voltage (0.9 V at 150 °C) ensure low conduction losses during sustained RMS loads up to 16 A at case temperatures ≤134 °C.

The device's static dV/dt immunity remains ≥500 V/µs even at maximum junction temperature (150 °C), while its non-repetitive surge rating (153 A for 8.3 ms) supports transient overcurrent handling in AC mains-connected crowbar and discharge circuits without external snubbers.

Key Specifications

Pinout & Package

Package: DPAK (TO-252), surface-mount, single-tab configuration with exposed drain pad for thermal conduction. Dimensions per DS14286 Rev 1: D = 6.22 mm, E = 6.73 mm, L = 1.78 mm, tab length ≈ 5.5 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TN1605H-8BTR, TN1605H-8G offers identical performance in a through-hole format but sacrifices SMT compatibility and thermal efficiency, while S4006L provides DPAK convenience at the cost of 62.5% lower RMS current and 25 °C lower thermal margin-making neither a drop-in replacement without redesign.

Availability

TN1605H-8BTR is available at Aetrix Electronics and suitable for AC inrush limiting, solid-state relay implementation, and crowbar protection circuits requiring stable component supply, high-temperature reliability, and surface-mount manufacturability.

Supply support for TN1605H-8BTR 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 microcontrollers, power devices, sensors, and analog ICs for automotive, industrial, and consumer markets.

The TN1605H-8BTR belongs to ST's high-temperature SCR family, engineered specifically for ruggedized AC control in space-constrained, thermally demanding applications such as power tools, kitchen appliances, and motorcycle electronics.

FAQ

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

The datasheet specifies that 16 A RMS operation requires a case temperature (T_C) ≤134 °C. This is achieved using ≥1.5 cm² of 70 µm-thick copper under the DPAK tab, yielding R_th(j-c) ≤1.1 °C/W. Exceeding 134 °C forces derating-for example, 10 A at T_C = 138 °C-to avoid exceeding T_j(max) = 150 °C.

Can TN1605H-8BTR be used without a heatsink in low-duty-cycle applications?

Yes-under pulsed or intermittent operation (e.g., <10% duty cycle, <100 ms on-time), the device can operate without an external heatsink if ambient temperature stays ≤75 °C and PCB copper area ≥3 cm² is provided under the tab. Thermal simulation per Figure 3 confirms up to 6 A average current at T_A = 75 °C with no heatsink.

Does this SCR support zero-crossing switching?

No-TN1605H-8BTR is a standard asymmetrical SCR without integrated zero-crossing detection. It conducts once triggered and turns off only when current falls below holding current (≤20 mA). Zero-crossing functionality must be implemented externally using a controller (e.g., MCU + optocoupler) synchronized to the AC waveform.

Is the DPAK footprint compatible with standard reflow soldering profiles?

Yes-the DPAK package is qualified for lead-free reflow per JEDEC J-STD-020. Peak temperature must not exceed 260 °C for ≤10 seconds, with ramp rates ≤3 °C/s pre- and post-peak. The halogen-free molding compound and lead-free plating ensure compatibility with standard Class 3 PCB assembly processes.