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STMicroelectronics TXN625RG
- Part No.:
- TXN625RG
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-220-3 Full Pack
- Datasheet:
-
TXN625RG.pdf
- Description:
- SCR 600V 25A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:1,445
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Product details
Overview
TXN625RG from STMicroelectronics is a 25 A, 600 V insulated-gate silicon-controlled rectifier (SCR) in TO-220AB ins package, with 40 mA gate trigger current, 2500 Vrms isolation voltage, and UL1557 certification. It delivers robust surge handling (314 A non-repetitive peak) for AC line control in industrial motor starters and solid-state relays.
For engineers reviewing the TXN625RG datasheet, TXN625RG pinout, TXN625RG application, or TXN625RG equivalent, key selection criteria include insulated package requirements, 600 V blocking capability, gate sensitivity at 40 mA, thermal resistance (2.0 °C/W junction-to-case), and compliance with UL1557 for safety-critical AC mains interfaces.
Technical Context
This SCR operates as a unidirectional, phase-controlled power switch requiring gate-triggered latching into conduction. Its design supports 180° conduction-angle operation with 25 A RMS on-state current at Tc = 83 °C and maintains stable triggering across -40 to +125 °C junction temperature range.
It features high dV/dt immunity (1500 V/µs minimum at 125 °C) and low on-state voltage drop (1.6 V max at 50 A), enabling reliable commutation in inductive loads without snubber circuits under specified gate drive conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 25 A RMS - maximum continuous load current at case temperature ≤83 °C |
| VDRM/VRRM | 600 V - peak repetitive off-state voltage rating for AC line applications |
| IGT | 40 mA max - gate current required to reliably trigger conduction at 12 V |
| Rth(j-c) | 2.0 °C/W - thermal resistance from junction to case, defining heatsink sizing |
| Isolation Voltage | 2500 Vrms - reinforced insulation barrier for primary-secondary separation |
| ITSM (tp=8.3 ms) | 314 A - surge current capability for short-duration overloads like motor startup |
| dI/dt | 50 A/µs - critical rate-of-rise limit determining gate drive strength needed |
Pinout & Package
TXN625RG uses the TO-220AB ins package: insulated plastic housing with metal tab, UL1557 certified, 2.3 g mass, and recommended mounting torque of 0.4–0.6 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | Connected to AC line or positive DC rail; carries full load current during conduction |
| Cathode (K) | Main current exit terminal | Connected to load return path; forms main conduction loop with Anode |
| Gate (G) | Control input terminal | Receives low-energy pulse (≥40 mA) to initiate latching; electrically isolated from case |
Key Features
| Feature | Design Value |
|---|---|
| UL1557-certified insulation | Enables direct use in Class I and II AC mains-connected equipment without additional creepage/clearance barriers |
| 2500 Vrms isolation | Supports reinforced insulation per IEC/EN 60747-9, eliminating need for external isolation components |
| 314 A non-repetitive surge rating | Withstands motor inrush or transformer energization surges without failure |
| 1500 V/µs dV/dt immunity | Reduces false triggering in noisy industrial environments with fast-switching adjacent devices |
| Clip assembly construction | Improves thermal cycling reliability and mechanical robustness versus wire-bonded SCRs |
Applications
| AC Motor Starter | Solid-State Relay |
|---|---|
Use Scenario: Controlling single-phase induction motor startup/shutdown in HVAC blowers and pumps. IC Role / Device Role / Timing Role: Main power switching element triggered by zero-crossing controller to manage phase-angle firing. Use Value: Insulated package eliminates need for optocoupler-isolated gate driver, reducing BOM count and PCB area. | Use Scenario: Replacing electromechanical relays in programmable logic controller (PLC) output modules. IC Role / Device Role / Timing Role: Bidirectional AC switching device controlled by microcontroller GPIO via discrete gate driver. Use Value: 2500 Vrms isolation enables direct interface between 24 V logic and 240 V AC loads without auxiliary isolation. |
| Lighting Dimmer | Industrial Heater Control |
Use Scenario: Phase-cut dimming of resistive halogen lamps in commercial lighting systems. IC Role / Device Role / Timing Role: Line-synchronized AC power regulator modulating conduction angle per dimmer command. Use Value: Low 40 mA IGT allows direct drive from standard logic-level gate drivers, simplifying control circuitry. | Use Scenario: Temperature-regulated heating elements in packaging machinery and ovens. IC Role / Device Role / Timing Role: Power stage switch in PID-controlled AC power delivery to resistive heating coils. Use Value: 25 A RMS rating supports continuous 6 kW load at 240 V, meeting industrial heater derating requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TYN625RG | Non-insulated TO-220AB package; Rth(j-c) = 1.0 °C/W; no isolation voltage rating | Requires external insulation barrier for mains-connected designs; better thermal performance in heatsink-mounted setups | Select when isolation is provided at board level and thermal efficiency is prioritized over safety certification |
| TXN625G | D2PAK package; same 600 V/25 A rating; 1.0 °C/W Rth(j-c); not UL-certified | Surface-mount alternative; lacks reinforced insulation; requires reflow-compatible layout and gate drive isolation | Select for automated SMT assembly where board-level isolation and thermal management are engineered separately |
Compared with TYN625RG and TXN625G, TXN625RG uniquely provides factory-certified 2500 Vrms isolation in a through-hole package, enabling simplified safety-compliant AC mains interfacing without added isolation components or layout constraints.
Availability
TXN625RG is available at Aetrix Electronics and suitable for industrial motor starters, solid-state relays, lighting dimmers, and heater controllers requiring stable component supply with long-term lifecycle support.
Supply support for TXN625RG 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.
TXN625RG belongs to ST's standard SCR product line, engineered specifically for cost-effective, safety-certified AC power control in industrial automation and building infrastructure applications.
FAQ
What is the maximum allowable case temperature for continuous operation?
The TXN625RG is rated for continuous operation at a maximum case temperature (Tc) of 83 °C, as defined in its absolute maximum ratings table. Exceeding this temperature reduces the permissible RMS current and risks thermal runaway. Heatsink design must ensure Tc remains at or below 83 °C under worst-case ambient and load conditions.
Does TXN625RG require a heat sink in all applications?
Yes - due to its 2.0 °C/W junction-to-case thermal resistance and 25 A RMS rating, TXN625RG dissipates significant power (up to ~40 W at full load). Even at moderate currents, passive cooling is insufficient; a properly sized aluminum heatsink with thermal interface material is mandatory to maintain safe junction temperature below 125 °C.
Can TXN625RG be used in DC applications?
TXN625RG is designed for AC line-commutated operation and is not rated for forced-commutated DC switching. Its latching behavior requires natural current zero-crossing to turn off; in pure DC, it remains latched after triggering unless externally commutated. Use only in AC or half-wave rectified applications where load current naturally falls to zero each cycle.
What is the significance of UL1557 certification for this device?
UL1557 certification confirms that the TXN625RG's insulated TO-220AB package meets rigorous standards for reinforced insulation, including dielectric withstand, creepage, and clearance. This allows direct use in safety-critical AC mains interfaces without additional isolation barriers, streamlining compliance with IEC 61800-5-1 and UL 508.
TXN625RG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3 Full Pack
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Off State:
- 600 V
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Gate Trigger (Igt) (Max):
- 40 mA
- Voltage - On State (Vtm) (Max):
- 1.6 V
- Current - On State (It (AV)) (Max):
- 16 A
- Current - On State (It (RMS)) (Max):
- 25 A
- Current - Hold (Ih) (Max):
- 50 mA
- Current - Off State (Max):
- 5 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 300A, 314A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220AB Insulated
TXN625RG FAQ
1.How can I place an order for TXN625RG through Aetrix?
Please submit a Request for Quotation (RFQ) for TXN625RG on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for TXN625RG reliable?
The price and inventory of TXN625RG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TXN625RG is usually 5 days.
3.What payment methods are accepted for TXN625RG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TXN625RG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TXN625RG?
TXN625RG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TXN625RG order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for TXN625RG?
For technical support, including TXN625RG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TXN625RG requirements.
6.How does Aetrix verify that TXN625RG is sourced from the original manufacturer or authorized distributors?
All TXN625RG products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TXN625RG meets industry standards.
7.What is the process for return or replacement of TXN625RG?
All TXN625RG units undergo pre-shipment inspection (PSI). If there is an issue with TXN625RG, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The TXN625RG part is unused and in its original packaging.
Return procedure for TXN625RG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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