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STMicroelectronics TXN612RG
- Part No.:
- TXN612RG
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TO-220-3
- Datasheet:
-
TXN612RG.pdf
- Description:
- SCR 600V 12A TO220AB
- Quantity:
- Payment:
- Shipping:
Inventory:451
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Product details
Overview
TXN612RG from STMicroelectronics is a 600 V, 12 A RMS silicon-controlled rectifier (SCR) in TO-220AB package, rated for 8 A average on-state current at Tc=80°C, with 125 A non-repetitive surge capability (tp=8.3 ms), used in industrial AC power control circuits driving resistive or inductive loads up to 400 Hz.
For engineers reviewing the TXN612RG datasheet, TXN612RG pinout, TXN612RG application, or TXN612RG equivalent, key selection criteria include repetitive peak off-state voltage (600 V), gate trigger current (≤15 mA), on-state voltage drop (≤1.6 V @ 24 A), thermal resistance junction-to-case (3.5 °C/W), and dV/dt immunity (≥200 V/µs).
Technical Context
The TXN612RG implements a glass-passivated PNPN thyristor structure optimized for high surge robustness and stable turn-on behavior across temperature. Its gate sensitivity (IGT ≤15 mA, VGT ≤1.5 V) enables direct drive from low-power logic or optocouplers without amplification.
It features high dV/dt immunity (≥200 V/µs at Tj=125°C) and fast turn-off time (tq ≈70 µs), supporting reliable commutation in phase-controlled rectifiers and AC static switches operating at line frequency and harmonics up to 400 Hz.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VDRM / VRRM | 600 V - Maximum repetitive blocking voltage in off-state; defines maximum AC line voltage it can safely control (e.g., 400 VAC RMS systems with margin) |
| IT(RMS) | 12 A - Continuous RMS on-state current rating at case temperature 80°C; determines heatsink sizing for steady-state conduction |
| IT(AV) | 8 A - Average on-state current at Tc=80°C; used for DC-equivalent power dissipation calculation in half-wave or phase-angle circuits |
| ITSM (tp=8.3 ms) | 125 A - Non-repetitive surge current capacity; supports motor startup surges or short-circuit fault clearing without latch-up |
| I²t (tp=10 ms) | 72 A²s - Thermal energy withstand limit; used for fuse coordination and overcurrent protection timing design |
| dV/dt (Tj=125°C) | ≥200 V/µs - Minimum rate of rise of off-state voltage before spurious turn-on; ensures noise immunity in noisy industrial environments |
| VTM (ITM=24 A) | ≤1.6 V - Peak on-state voltage at 24 A pulse; directly impacts conduction loss and thermal design (Pcond ≈ IT × VTM) |
Pinout & Package
TO-220AB plastic package with insulated mounting base (2500 V RMS isolation per UL E81734), designed for conduction cooling via heatsink. Pin assignment verified per STMicroelectronics mechanical drawing and device marking convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | Connected to AC line or load side; must withstand full blocking voltage and carry full load current |
| Cathode (K) | Main current exit terminal | Connected to neutral or return path; forms main conduction loop with Anode and Gate |
| Gate (G) | Trigger control input | Low-energy input (≤15 mA, ≤1.5 V) that initiates latching conduction; requires clean, fast-rising pulse |
Key Features
| Feature | Design Value |
|---|---|
| High surge capability | 125 A non-repetitive peak current (8.3 ms) supports motor inrush and transient overload without failure |
| Insulated package | 2500 V RMS isolation between case and terminals enables safe mounting on live heatsinks in grounded systems |
| Stable gate triggering | IGT ≤15 mA and VGT ≤1.5 V across -40°C to +125°C ensure reliable turn-on with standard optocoupler drivers |
| High dV/dt immunity | ≥200 V/µs at 125°C prevents false triggering from switching transients in industrial AC drives and lighting controls |
Applications
| Industrial Motor Control | Phase-Controlled Heating |
|---|---|
Use Scenario: Controlling speed of single-phase induction motors in pumps, fans, and compressors using phase-angle firing. IC Role / Device Role / Timing Role: Main power switching element in AC line-commutated half-wave or full-wave SCR bridge. Use Value: 600 V blocking rating accommodates 400 VAC mains with safety margin; 12 A RMS rating supports motors up to ~1.5 kW. | Use Scenario: Regulating power to resistive heating elements in ovens, furnaces, and soldering stations. IC Role / Device Role / Timing Role: Line-synchronized AC power switch enabling precise duty-cycle control via gate timing. Use Value: High thermal stability (Tj = −40°C to +125°C) ensures consistent output across ambient temperature swings. |
| AC Static Switching | UPS / Inverter Bypass |
Use Scenario: Solid-state replacement for electromechanical contactors in HVAC and power distribution panels. IC Role / Device Role / Timing Role: Bidirectional AC switch activated by zero-crossing or phase-triggered gate pulses. Use Value: 125 A surge rating handles inrush currents of capacitive loads (e.g., transformer magnetization) during turn-on. | Use Scenario: Bypass path in online UPS systems that transfers load from inverter to utility during overload or fault. IC Role / Device Role / Timing Role: Fail-safe conduction path activated only when inverter is disabled; remains off during normal operation. Use Value: 2500 V RMS insulation allows direct mounting to chassis-grounded heatsinks without additional isolation barriers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR-based AC power control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TYN612 | Junction-to-case thermal resistance 2.5 °C/W (vs. TXN612RG's 3.5 °C/W); non-insulated TO-220AB package | Requires isolated mounting hardware for chassis-grounded heatsinks; lower Rth(j-c) allows higher continuous current at same case temp | Select when heatsink is electrically isolated and thermal performance is prioritized over mounting simplicity |
| BT169G | Lower rating: 400 V VDRM, 0.8 A IT(RMS); TO-92 package; not a direct replacement | Suitable only for low-power signal-level triggering or pilot SCRs-not for main power switching | Use only as gate driver stage or in auxiliary control circuits, never as primary power switch |
Compared with TYN612 and BT169G, TXN612RG uniquely combines 600 V blocking, 12 A RMS current, 2500 V isolation, and TO-220AB mechanical robustness-making it optimal for standalone industrial AC switching where safety, surge resilience, and thermal margin are critical.
Availability
TXN612RG is available at Aetrix Electronics and suitable for industrial motor control, phase-controlled heating, AC static switching, and UPS bypass applications requiring stable component supply and long-term manufacturing continuity.
Supply support for TXN612RG 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, specializing in power devices, microcontrollers, sensors, and analog ICs for industrial, automotive, and consumer markets.
The TXN series is part of ST's high-reliability SCR portfolio designed specifically for ruggedized AC power control in harsh environments-emphasizing surge tolerance, thermal stability, and UL-recognized insulation.
FAQ
Is TXN612RG compatible with zero-crossing trigger circuits?
Yes. TXN612RG supports zero-crossing triggering due to its guaranteed gate trigger current (IGT ≤15 mA) and low gate threshold voltage (VGT ≤1.5 V) at 25°C. Its dV/dt immunity (≥200 V/µs) prevents false turn-on near voltage zero crossings, making it suitable for noise-immune dimming and soft-start designs.
What is the maximum allowable case temperature for continuous 12 A RMS operation?
Per datasheet Fig.5, TXN612RG delivers 12 A RMS only at Tc = 80°C. Exceeding this case temperature reduces RMS current derating linearly; at Tc = 90°C, maximum IT(RMS) drops to 10 A. Heatsink design must maintain case temperature ≤80°C under full load and worst-case ambient conditions.
Does TXN612RG require a snubber circuit in inductive load applications?
A snubber is recommended for inductive loads (e.g., motors, transformers) to suppress voltage spikes during turn-off. The device's tq ≈70 µs and dV/dt rating (200 V/µs) define minimum snubber RC values needed to keep dv/dt below threshold and prevent commutation failure or re-triggering.
Can TXN612RG be mounted directly to a grounded metal heatsink?
Yes. The TO-220AB package provides 2500 V RMS isolation between terminals and case (UL E81734 certified), allowing direct mounting to grounded heatsinks without insulating washers-reducing thermal resistance and simplifying mechanical assembly in panel-mounted industrial equipment.
TXN612RG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TO-220-3
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Off State:
- 600 V
- Voltage - Gate Trigger (Vgt) (Max):
- 1.5 V
- Current - Gate Trigger (Igt) (Max):
- 15 mA
- Voltage - On State (Vtm) (Max):
- 1.6 V
- Current - On State (It (AV)) (Max):
- 8 A
- Current - On State (It (RMS)) (Max):
- 12 A
- Current - Hold (Ih) (Max):
- 30 mA
- Current - Off State (Max):
- 10 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 120A, 125A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TO-220
TXN612RG FAQ
1.How can I place an order for TXN612RG through Aetrix?
Please submit a Request for Quotation (RFQ) for TXN612RG 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 TXN612RG reliable?
The price and inventory of TXN612RG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TXN612RG is usually 5 days.
3.What payment methods are accepted for TXN612RG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TXN612RG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TXN612RG?
TXN612RG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TXN612RG 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 TXN612RG?
For technical support, including TXN612RG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TXN612RG requirements.
6.How does Aetrix verify that TXN612RG is sourced from the original manufacturer or authorized distributors?
All TXN612RG 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 TXN612RG meets industry standards.
7.What is the process for return or replacement of TXN612RG?
All TXN612RG units undergo pre-shipment inspection (PSI). If there is an issue with TXN612RG, 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 TXN612RG part is unused and in its original packaging.
Return procedure for TXN612RG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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