STMicroelectronics TN2540-12G-TR

Overview

TN2540-12G-TR from STMicroelectronics is a standard silicon-controlled rectifier (SCR) in D²PAK surface-mount package, rated for 25 A RMS on-state current and 1200 V repetitive peak off-state voltage, with maximum gate trigger current of 40 mA. It delivers high static/dynamic commutation immunity at 125 °C junction temperature (dl/dt = 50 A/µs, dV/dt = 1500 V/µs), and is ECOPACK®2-compliant. It is deployed in solar and wind inverters for AC line switching under high dv/dt stress.

For engineers reviewing the TN2540-12G-TR datasheet, TN2540-12G-TR pinout, TN2540-12G-TR application, or TN2540-12G-TR equivalent, key selection criteria include verified 1200 V blocking capability, 25 A thermal derating at Tc = 102 °C, gate sensitivity ≤40 mA, junction-to-case thermal resistance ≤1.0 °C/W, and D²PAK anode-on-backside layout compatibility with high-power PCB heatsinking.

Technical Context

This SCR operates as a unidirectional, gate-triggered power switch for phase-controlled rectification and AC line switching. Its design supports robust turn-on under high dv/dt transients (≥1500 V/µs at 125 °C) and fast current rise (50 A/µs critical dl/dt), enabling reliable operation in inverter bridge arms and soft-start circuits without snubber networks.

It features low on-state voltage drop (VTM ≤1.60 V at 50 A, 25 °C) and dynamic resistance (RD ≤14 mΩ at 125 °C), minimizing conduction losses in high-current industrial motor control and battery charger rectifiers. The device's 314 A non-repetitive surge rating (8.3 ms) supports short-term overload tolerance during welder ignition or UPS transfer events.

Key Specifications

Pinout & Package

Package: D²PAK (TO-263), surface-mount, anode on backside metal tab; thermally optimized for direct PCB heatsinking. Dimensions per DS12791 Rev 1: 10.28 mm × 9.35 mm × 15.85 mm (L × W × H), 1.6 g weight, ECOPACK®2 compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MCR25N1200 and BT151-1200R, TN2540-12G-TR uniquely balances SMT manufacturability, 25 A thermal capability, and 1.0 °C/W thermal resistance-making it optimal for high-density, high-reliability renewable energy and industrial power systems requiring automated assembly and minimal heatsink volume.

Availability

TN2540-12G-TR is available at Aetrix Electronics and suitable for solar inverters, industrial welding systems, and uninterruptible power supplies requiring stable component supply, long-lifecycle availability, and RoHS-compliant sourcing.

Supply support for TN2540-12G-TR 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 industrial, automotive, and consumer markets.

TN2540-12G-TR belongs to ST's high-voltage SCR product line, engineered specifically for ruggedized AC power control in renewable energy, UPS, and motor drive systems demanding high dv/dt immunity and thermal reliability.

FAQ

What is the maximum allowable gate trigger current for reliable turn-on across temperature?

The TN2540-12G-TR specifies IGT ≤40 mA at Tj = 125 °C, with minimum 4 mA at 25 °C. Gate drive circuits must deliver ≥4 mA to guarantee turn-on at cold start and ≤40 mA to avoid gate junction overstress at elevated temperature. Pulse width should exceed 20 µs to ensure latching under worst-case load conditions.

Can this SCR be used in phase-angle dimming circuits without external snubbers?

Yes-the device's guaranteed dV/dt immunity of 1500 V/µs at 125 °C and critical dl/dt of 50 A/µs allow direct use in phase-controlled lighting and heater drivers up to 60 Hz without RC snubbers, provided gate drive timing avoids commutation windows near voltage zero-crossings and layout minimizes stray inductance.

How does the D²PAK anode-on-backside configuration affect PCB thermal design?

The anode is electrically and thermally connected to the exposed metal tab on the package underside. For optimal thermal performance, this tab must be soldered to a large, low-thermal-resistance copper pour tied to internal or external heatsinks. Electrical isolation from other nets is mandatory unless the anode is system-ground referenced, requiring dielectric prepreg or thermal pad insulation.

Is TN2540-12G-TR suitable for bidirectional AC switching applications?

No-it is a unidirectional SCR and conducts current only from anode to cathode. For bidirectional AC control, two SCRs must be connected in inverse-parallel, or a TRIAC (e.g., ST's BTB16-800CW) should be selected. Using a single TN2540-12G-TR in AC lines without proper anti-parallel protection risks reverse-breakdown failure.