STMicroelectronics TN805-600H

Overview

TN805-600H from STMicroelectronics is a standard-sensitivity 8 A, 600 V silicon-controlled rectifier (SCR) in IPAK package, featuring 5 mA maximum gate trigger current (IGT), 1.6 V max on-state voltage (VTM) at 16 A, and 50 A/µs critical rate of rise of on-state current (dl/dt); used for overvoltage crowbar protection and motor control in power tools.

For engineers reviewing the TN805-600H datasheet, TN805-600H pinout, TN805-600H application, or TN805-600H equivalent, this page delivers verified electrical specs, thermal resistance data (Rth(j-c) = 1.3 °C/W), package footprint details, and real-world SCR selection guidance for crowbar, phase-control, and inrush limiting circuits.

Technical Context

This SCR operates as a unidirectional latching switch triggered by gate current, with holding current (IH) ≤25 mA and latching current (IL) ≤30 mA at 25 °C. Its dV/dt immunity is ≥50 V/µs at 125 °C with gate open, ensuring robust noise immunity in noisy industrial environments.

The device uses planar passivated junction technology and is rated for junction temperatures from –40 to +125 °C. Thermal performance is defined by Rth(j-c) = 1.3 °C/W (IPAK), enabling 8 A RMS conduction at TC = 91 °C without forced cooling.

Key Specifications

Pinout & Package

IPAK package: single-ended, 3-terminal through-hole mount with isolated tab (cathode-connected tab), 16.1 mm height, 6.0–6.2 mm width, 9.0–9.6 mm length, and 0.9–1.1 mm base thickness. Tab serves as cathode terminal and primary thermal path.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TN805-600H, TN815-600H trades lower gate drive simplicity for higher noise margin, while TYN608RG provides identical thermal performance in a mechanically robust through-hole form factor-neither is pin-compatible due to differing leadframe geometry and tab isolation schemes.

Availability

TN805-600H is available at Aetrix Electronics and suitable for overvoltage crowbar protection, power tool motor control, and inrush current limiting requiring stable component supply across industrial production cycles.

Supply support for TN805-600H 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, MCU, power, and sensing solutions for industrial, automotive, and consumer markets.

TN805-600H belongs to ST's standard-sensitivity 8 A SCR family, engineered for cost-effective, thermally efficient AC power control in space-constrained industrial equipment where reliability under surge and thermal stress is critical.

FAQ

What is the maximum junction temperature for continuous operation?

The TN805-600H has an operating junction temperature range of –40 to +125 °C. Continuous operation at the upper limit requires maintaining case temperature ≤91 °C per the IT(RMS) derating curve, achievable with proper heatsinking given its Rth(j-c) = 1.3 °C/W in IPAK package.

Can TN805-600H replace a triac in AC phase-control applications?

No-it is a unidirectional SCR and conducts only during one AC half-cycle. For full-wave phase control, two SCRs in inverse-parallel or a triac is required. TN805-600H is appropriate for half-wave control, DC crowbar, or single-quadrant switching where polarity is fixed.

Is the IPAK tab electrically isolated?

Yes-the IPAK package features an isolated tab connected exclusively to the cathode (K). This allows direct mounting to a grounded or floating heatsink without additional insulation, unlike some TO-220 variants where the tab may be internally connected to the collector or drain.

What gate resistor value is recommended for microcontroller drive?

With IGT ≤5 mA and VGT ≤1.3 V, a 470 Ω series resistor limits gate current to ~10 mA when driven from a 5 V GPIO, providing margin above minimum trigger level while protecting both MCU pin and SCR gate from transient overstress per datasheet PG(AV) = 1 W rating.