STMicroelectronics TN4015H-6T

Overview

TN4015H-6T from STMicroelectronics is a 40 A, 600 V RMS SCR in non-isolated TO-220AB package, rated for 150 °C junction temperature, with 15 mA gate trigger current (IGT), 500 V/µs dV/dt immunity at 150 °C, and 100 A/µs critical dI/dt. It serves as a robust main switching element in motorbike voltage regulators and solid-state relays requiring high thermal margin and noise resilience.

For engineers reviewing the TN4015H-6T datasheet, TN4015H-6T pinout, TN4015H-6T application, or TN4015H-6T equivalent, key selection criteria include verified 40 A IT(RMS) at Tc = 119 °C, 600 V VDRM/VRRM rating, 1.6 V on-state voltage at 80 A, 0.8 °C/W junction-to-case thermal resistance, and ECOPACK2-compliant TO-220AB mechanical footprint.

Technical Context

This SCR employs planar passivated silicon technology optimized for high-temperature operation up to 150 °C, enabling stable conduction under sustained thermal stress in automotive and industrial environments. Its gate triggering threshold remains stable across temperature (IGT ≤ 15 mA up to 150 °C), while dV/dt immunity is maintained at ≥500 V/µs even at maximum junction temperature.

The device supports fast turn-on dynamics (typ. 1.9 µs turn-on time at 80 A) and withstands surge currents up to 394 A (8.3 ms, non-repetitive), making it suitable for crowbar protection and inrush limiting where transient energy absorption and controlled latching are required.

Key Specifications

Pinout & Package

TO-220AB package: non-isolated, 3-terminal plastic case with metal tab (anode-connected), standard mounting hole, 0.4–0.6 N·m screw torque rating, halogen-free UL94 V0 molding compound, lead-free plating.

Key Features

Applications

Equivalent & Alternatives

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

Compared with BT139-600E and TYN640, TN4015H-6T uniquely delivers 40 A RMS current handling *with* 15 mA IGT and 500 V/µs dV/dt at 150 °C - enabling simpler gate drivers and higher reliability in thermally stressed, electrically noisy motorbike and industrial settings.

Availability

TN4015H-6T is available at Aetrix Electronics and suitable for motorbike voltage regulator circuits, solid-state relay designs, and inrush current limiting circuits requiring stable component supply and long-term industrial availability.

Supply support for TN4015H-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, designing and manufacturing analog, microcontroller, power, and sensor solutions for automotive, industrial, and consumer markets.

TN4015H-6T belongs to ST's high-temperature SCR product line, engineered specifically for ruggedized AC power control in space-constrained, thermally demanding applications like vehicle electrical systems and industrial automation.

FAQ

What is the maximum allowable case temperature for continuous 40 A operation?

The TN4015H-6T supports 40 A IT(RMS) only when the case temperature (Tc) is held at or below 119 °C, as specified in Table 1 of DS11764. Exceeding this temperature requires derating per Figure 2; at Tc = 125 °C, IT(AV) drops to 22 A. Thermal design must ensure adequate heatsinking to maintain Tc ≤ 119 °C under worst-case ambient and airflow conditions.

Can TN4015H-6T be used in DC switching applications?

No - TN4015H-6T is a unidirectional SCR designed for AC line-commutated operation. It cannot be turned off by gate control and relies on natural current zero-crossing to reset. For DC switching, a forced-commutated device such as a MOSFET, IGBT, or reverse-conducting thyristor with auxiliary turn-off circuitry is required.

Is the TO-220AB package electrically isolated between terminals?

No - the TO-220AB package used in TN4015H-6T has a non-isolated construction: the metal tab is internally connected to the anode terminal. Electrical isolation between anode and heatsink must be achieved using insulating washers and shoulder washers, with appropriate creepage/clearance verification per end-equipment safety standards.

What gate drive circuit is recommended to ensure reliable triggering?

A gate trigger pulse of ≥15 mA (IGT), ≥100 µs duration, and ≥1.3 V (VGT) is required. ST recommends using a pulse transformer or optocoupler (e.g., MOC3021) with series resistor selected to deliver ≥2× IGT (30 mA) into the gate-cathode junction. Gate resistor must limit peak IGM to ≤4 A and ensure dI/dt ≥0.2 A/µs for consistent turn-on timing per datasheet Figure 10.