BTW681200 STMicroelectronics SCR (Transistor Outline, Vertical) In Stock
STMicroelectronics BTW681200 is a silicon-controlled rectifier rated at 30 A RMS current and 1200 V repetitive peak voltage. It features a 2 µs turn-off time, 50 mA gate trigger current, and an isolated TO-3 style vertical package. Suitable for AC power controllers, motor drives, and industrial heating applications.
- Manufacturer
- STMicroelectronics
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- BTW681200 Datasheet PDF
- Category
- SCR
- Temp Range
- -40.0°C to 125.0°C
- RoHS
- Non-compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of BTW681200?
- 30 A RMS on-state current for medium-power AC switching applications
- 1200 V repetitive peak off-state voltage provides robust surge margin on 480 V AC mains
- 2 µs circuit-commutated turn-off time enables higher-frequency phase control
- Gate trigger current of 50 mA and voltage of 1.5 V for reliable firing from standard drivers
- Isolated TO-3 vertical package simplifies heatsink mounting without electrical isolation pads
- 250 V/µs critical dV/dt rating suppresses false triggering from fast transients
What is BTW681200 used for?
The BTW681200 is used in AC phase-angle controllers, industrial heating regulators, and soft-start motor drives that switch mains voltages up to 1200 V at currents up to 30 A RMS. Its robust dV/dt rating and fast 2 µs turn-off time make it suitable for inductive load applications such as transformer primaries and solenoid drivers where voltage transients are common. The device is also deployed in UPS crowbar protection circuits and high-power light-dimmer assemblies requiring a rugged, isolated high-voltage SCR.
What are the specifications of BTW681200?
| Reach Compliance Code | Unknown |
| YTEOL | 0 |
| Case Connection | ISOLATED |
| Circuit Commutated Turn-off Time-Nom | 2 µs |
| Configuration | SINGLE |
| Critical Rate of Rise of Off-State Voltage-Min | 250V/us |
| DC Gate Trigger Current-Max | 50mA |
| DC Gate Trigger Voltage-Max | 1.5V |
| Holding Current-Max | 75mA |
| JESD-30 Code | R-PSFM-T3 |
| JESD-609 Code | e0 |
| Number of Elements | 1 |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Peak Reflow Temperature (Cel) | NOT SPECIFIED |
| Qualification Status | Not Qualified |
| RMS On-state Current-Max | 30A |
| Repetitive Peak Off-state Leakage Current-Max | 20 µA |
| Repetitive Peak Off-state Voltage | 1200V |
| Repetitive Peak Reverse Voltage | 1200V |
| Surface Mount | NO |
| Terminal Finish | TIN LEAD |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Time@Peak Reflow Temperature-Max (s) | NOT SPECIFIED |
| Trigger Device Type | SCR |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Non-compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the BTW681200 datasheet?
BTW681200 Datasheet DownloadOfficial datasheet from STMicroelectronics
What are equivalent replacements for BTW681200?
Compatible alternatives and drop-in replacements for BTW681200:
Silicon Controlled Rectifier, 30A I(T)RMS, 25A I(T), 1200V V(DRM), 1200V V(RRM), 1 Element
Frequently Asked Questions
What current and voltage ratings make the BTW681200 suitable for industrial 480 V AC phase control?
The BTW681200 is rated at 30 A RMS on-state current and 1200 V repetitive peak off-state voltage, providing a comfortable margin above 480 V AC mains (which peaks near 680 V). This headroom accommodates inductive load transients and line surges without requiring additional voltage clamp circuits.
How does the 2 µs turn-off time of the BTW681200 affect its usability in phase-control heating applications?
A 2 µs circuit-commutated turn-off time means the BTW681200 reliably blocks the next half-cycle before the AC zero crossing, enabling accurate phase angle adjustment down to a few degrees for precise temperature regulation. Slower SCRs with 20 µs or longer turn-off times would miss the commutation window at 50 Hz or 60 Hz mains frequency.
Can the BTW681200 be driven directly from a microcontroller gate driver, given its trigger specifications?
The BTW681200 requires a gate trigger current of up to 50 mA and a gate trigger voltage of 1.5 V maximum, which exceeds typical microcontroller GPIO output drive of 5–10 mA at 3.3 V. A small opto-isolator or pulse transformer gate driver rated for 50 mA is needed between the MCU and the SCR gate to ensure reliable firing across the full temperature range.
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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.
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