STMicroelectronics TN5015H-8I

Overview

TN5015H-8I from STMicroelectronics is a high-temperature, insulated-packaged SCR (silicon-controlled rectifier) rated for 50 A RMS on-state current and 800 V repetitive peak off-state voltage (VDRM/VRRM), with maximum junction temperature of 150 °C. It features low gate trigger current (IGT = 15 mA), high static dV/dt immunity (1000 V/μs at 150 °C), and robust turn-on di/dt capability (200 A/μs), enabling use in AC line switching and inrush current limiting circuits for industrial AC/DC converters.

For engineers reviewing the TN5015H-8I datasheet, TN5015H-8I pinout, TN5015H-8I application, or TN5015H-8I equivalent, key selection criteria include its insulated TO-220AB package (2500 VRMS isolation), thermal resistance (Rth(j-c) ≤ 1.6 °C/W), and trade-off between noise immunity and gate sensitivity - critical for crowbar protection and motor control designs operating at elevated ambient temperatures.

Technical Context

This SCR operates as a latching, unidirectional power switch triggered by a gate pulse and commutated by AC zero-crossing. Its 150 °C max junction temperature enables sustained 50 A RMS conduction at case temperatures up to 75 °C without derating beyond datasheet curves, supported by low on-state voltage (VTM ≤ 1.55 V at 100 A, 25 °C) and dynamic resistance (RD ≤ 8 mΩ at 150 °C).

The device's high dV/dt immunity (≥1000 V/μs at Tj = 150 °C) and controlled turn-on di/dt (200 A/μs) are co-optimized to prevent false triggering while ensuring reliable commutation in noisy industrial environments - particularly where fast-rising transients occur across inductive loads like heating resistors or motor windings.

Key Specifications

Pinout & Package

Package: TO-220AB insulated - molded thermoset housing with electrically isolated metal tab (K), rated for 2500 VRMS isolation, UL 1554 certified (file #81734), halogen-free and lead-free per ECOPACK2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TYN5015 and S4006L, TN5015H-8I uniquely combines 800 V blocking, 50 A RMS, 150 °C operation, and 2500 VRMS insulation in a single TO-220AB package - making it the only option among the three qualified for compact, safety-certified, high-temperature industrial AC switching without external isolation components.

Availability

TN5015H-8I is available at Aetrix Electronics and suitable for inrush current limiting circuits in AC/DC converters, solid-state relay modules, and heating resistor control systems requiring stable component supply across multi-year production cycles.

Supply support for TN5015H-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, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.

TN5015H-8I belongs to ST's high-temperature SCR family engineered specifically for ruggedized AC power control - emphasizing thermal resilience, transient immunity, and safety-compliant packaging for industrial automation and energy infrastructure.

FAQ

What is the maximum allowable case temperature for continuous 50 A RMS operation?

The datasheet specifies 50 A RMS operation at Tc = 75 °C with 180° conduction angle. At higher case temperatures, current must be derated per Figure 2: e.g., 40 A at Tc = 90 °C, 30 A at Tc = 105 °C. Exceeding these limits risks thermal runaway due to positive temperature coefficient of on-state voltage.

Can TN5015H-8I be used in DC circuits?

No - this is a standard SCR, not a GTO or IGCT. It lacks gate-turn-off capability and relies on natural commutation (current zero-crossing). In DC, once triggered, it remains latched until current falls below holding current (IH ≤ 50 mA), which typically requires external forced commutation circuitry not supported by this device.

Is a heatsink mandatory for 50 A operation?

Yes - Rth(j-c) = 1.6 °C/W implies ~80 °C junction rise at 50 A (P ≈ 78 W × 1.6 °C/W ≈ 125 °C ΔT). Without a heatsink, ambient-to-case thermal resistance exceeds 60 °C/W (Figure 12), causing junction temperature to exceed 150 °C even at moderate ambient. A heatsink with Rth(c-a) ≤ 25 °C/W is recommended.

Does the insulated TO-220AB package require special mounting torque?

Yes - the datasheet specifies recommended torque of 0.55 N·m and absolute maximum of 0.70 N·m for the mounting screw. Over-torquing risks cracking the insulated housing or deforming the internal die attach, compromising both thermal performance and 2500 VRMS isolation integrity.