TXN612 STMicroelectronics SCR (Transistor Outline, Vertical) In Stock
STMicroelectronics TXN612 is a single silicon controlled rectifier (SCR) in a TO-220AB isolated package, featuring a 70 µs circuit-commutated turn-off time, 200 V/µs critical rate-of-rise of off-state voltage, and a 15 mA maximum gate trigger current for robust phase-control and power-switching applications. Available from global distributors with worldwide shipping.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- TXN612 Datasheet PDF
- Category
- SCR
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Single SCR in isolated TO-220AB package with 70 µs commutation turn-off time enables reliable AC phase-control in motor speed regulators
- 200 V/µs critical dV/dt rating and 1.5 V maximum gate trigger voltage ensure noise immunity in industrial power switching circuits
- Isolated tab design eliminates the need for an insulating pad in many heat-sink mounting configurations, reducing assembly complexity and thermal resistance
Applications
The TXN612 is used in AC power control systems such as light dimmers, heating element controllers, and single-phase motor speed regulators where a single SCR switches loads up to several hundred watts. Its isolated TO-220AB package simplifies heat-sink mounting in appliance control boards and industrial soft-starters without additional insulating hardware. The 70 µs turn-off time and 200 V/µs dV/dt rating make it suitable for 50 Hz and 60 Hz power-line switching with reliable noise immunity.
Specifications
| YTEOL | 0 |
| Case Connection | ISOLATED |
| Circuit Commutated Turn-off Time-Nom | 70 µs |
| Configuration | SINGLE |
| Critical Rate of Rise of Off-State Voltage-Min | 200V/us |
| DC Gate Trigger Current-Max | 15mA |
| DC Gate Trigger Voltage-Max | 1.5V |
| Holding Current-Max | 30mA |
| JEDEC-95 Code | TO-220AB |
| JESD-30 Code | R-PSFM-T3 |
| JESD-609 Code | e3 |
| Leakage Current-Max | 3mA |
| Non-Repetitive Pk On-state Cur | 120A |
| Number of Elements | 1 |
| On-state Current-Max | 12000A |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Qualification Status | Not Qualified |
| RMS On-state Current-Max | 12A |
| Reference Standard | UL RECOGNIZED |
| Repetitive Peak Off-state Leakage Current-Max | 10 µA |
| Repetitive Peak Off-state Voltage | 600V |
| Repetitive Peak Reverse Voltage | 600V |
| Surface Mount | NO |
| Terminal Finish | Matte Tin (Sn) |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Trigger Device Type | SCR |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8541.30.00.80 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for TXN612:
suggested
Frequently Asked Questions
What is the circuit-commutated turn-off time of the TXN612 and why does it matter in AC phase-control circuits?
The TXN612 has a circuit-commutated turn-off time of 70 µs. In 50 Hz or 60 Hz AC phase-control applications, the SCR must turn off naturally at the current zero crossing. A 70 µs turn-off time is well within the available commutation interval, ensuring the device reliably latches off before the next gate pulse cycle in light dimmer and motor speed control applications.
How does the isolated TO-220AB package of the TXN612 benefit industrial board assembly?
The isolated tab in the TO-220AB package electrically separates the case from the anode terminal, allowing engineers to bolt the TXN612 directly to a metallic heat sink without an insulating mica pad or thermal interface sheet. This reduces thermal resistance between junction and heat sink by approximately 0.5°C/W and simplifies the assembly process in industrial power modules and appliance boards.
What gate trigger current and voltage are required to reliably fire the TXN612?
The TXN612 requires a maximum DC gate trigger voltage of 1.5 V and a maximum gate trigger current of 15 mA to guarantee turn-on across its operating temperature range. In practice, gate drive circuits supplying 20 mA to 30 mA pulses of at least 10 µs duration ensure reliable triggering even at low anode-to-cathode voltages in AC phase-control and soft-start designs.
Related Guides
CL31A107MQHNNNE 1206 100 uF MLCC Selection Guide
How to choose CL31A107MQHNNNE and related 1206 MLCCs for low-voltage bulk capacitance and regulator stability.
Jul 2, 2026
CL05B103KB5NNNC 0402 10 nF X7R MLCC Selection Guide
How to choose CL05B103KB5NNNC and related 0402 MLCCs for bypassing, filtering, voltage derating, and sourcing.
Jul 2, 2026
ADAQ7768-1 Design Guide for Precision Vibration and Dynamic Signal Measurement
Design ADAQ7768-1 precision data acquisition channels for vibration and dynamic sensing with the right bandwidth, reference, clock, and layout choices.
Jun 30, 2026
AD5204BRZ10 Design Guide for SPI-Controlled Gain and Offset Calibration
Design AD5204BRZ10 digital potentiometer calibration loops with bounded trim span, safe wiper current, clean SPI routing, and reliable startup codes.
Jun 30, 2026
Why Buy from FindMyChip
About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
In Stock · 24h Response · Worldwide Shipping
Response within 24 hours · Worldwide shipping
“Response time is incredible — usually under 4 hours. They understand that production lines can't wait.”