STMicroelectronics TYN625RG

Overview

TYN625RG from STMicroelectronics is a 25 A, 600 V standard silicon-controlled rectifier (SCR) in a non-insulated TO-220AB package, with 40 mA gate trigger current and 1.6 V on-state voltage at 50 A. It delivers robust surge capability (300 A, 10 ms) and operates up to 125 °C junction temperature, used in AC motor controls, solid-state relays, and industrial power switching.

For engineers reviewing the TYN625RG datasheet, TYN625RG pinout, TYN625RG application, or TYN625RG equivalent, key selection criteria include repetitive peak off-state voltage (600 V), on-state rms current (25 A), thermal resistance (1.0 °C/W junction-to-case), gate trigger sensitivity (40 mA), and TO-220AB mechanical compatibility for heatsink mounting.

Technical Context

This SCR operates as a unidirectional latching switch triggered by a positive gate pulse relative to cathode. Its 1500 V/µs critical dV/dt rating at 125 °C ensures noise immunity in high-slew-rate AC line environments, while the 50 A/µs dI/dt rating supports fast turn-on under inductive loads without commutation failure.

Thermal design relies on direct case-to-heatsink conduction (R_th(j-c) = 1.0 °C/W), requiring mechanical torque of 0.4–0.6 N·m for mounting. The device's 14 mΩ dynamic resistance and 0.77 V threshold voltage at 125 °C define conduction loss behavior across operating temperature and load current ranges.

Key Specifications

Pinout & Package

TYN625RG uses a standard 3-pin TO-220AB package with metal tab (anode) electrically connected to pin 1. Mounting requires insulated hardware only if anode isolation from heatsink is not required.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TYN625RG, TYN825RG extends voltage margin for higher-line applications without altering thermal or drive design, while TXN625RG trades thermal efficiency (2× R_th(j-c)) for certified isolation-critical in medical or Class I safety-critical systems.

Availability

TYN625RG is available at Aetrix Electronics and suitable for AC motor controls, solid-state relays, industrial heater regulation, and inrush limiting circuits requiring stable component supply and long-term production continuity.

Supply support for TYN625RG 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, digital, and mixed-signal ICs for automotive, industrial, and consumer markets.

TYN625RG belongs to ST's standard SCR product line engineered for cost-effective, high-reliability AC power control in industrial automation, building management, and appliance systems.

FAQ

What is the maximum allowable case temperature for continuous operation?

The TYN625RG supports continuous operation up to 100 °C case temperature (T_c) while delivering its full 25 A RMS on-state current rating. Exceeding this temperature requires linear derating per Figure 2 in the datasheet, with zero current allowed at 150 °C ambient (junction limit). Thermal design must maintain T_c ≤ 100 °C under worst-case load and ambient conditions.

Can TYN625RG be driven directly from a microcontroller GPIO pin?

No-TYN625RG requires 40 mA gate trigger current, exceeding typical GPIO sink/source limits (usually ≤20 mA). A discrete NPN transistor (e.g., BC817) or dedicated SCR driver IC (e.g., MOC3021 optocoupler) is required to provide sufficient gate current while maintaining isolation and timing precision.

Is heatsink mounting torque specified for the TO-220AB package?

Yes-ST specifies a recommended mechanical torque of 0.4 to 0.6 N·m for the mounting screw securing the TYN625RG TO-220AB package to the heatsink. Under-torque increases thermal resistance and risk of overheating; over-torque may crack the epoxy body or deform the tab, degrading thermal transfer and electrical reliability.

How does the 1500 V/µs dV/dt rating impact snubber design?

The 1500 V/µs dV/dt rating means the device resists false triggering up to that slew rate, reducing or eliminating the need for RC snubbers in many 50/60 Hz AC applications. However, snubbers remain advisable in high-noise environments or with highly inductive loads where transient overshoot may exceed this threshold, especially near end-of-life or elevated temperature.