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STMicroelectronics BTW68-1200RG
- Part No.:
- BTW68-1200RG
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TOP-3
- Datasheet:
-
BTW68-1200RG.pdf
- Description:
- SCR 1.2KV 30A TOP3
- Quantity:
- Payment:
- Shipping:
Inventory:323
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Product details
Overview
BTW68-1200RG from STMicroelectronics is a 30 A, 1200 V insulated TRIAC (SCR-based bidirectional thyristor) designed for high-power AC switching in solid-state relays and industrial motor control. It delivers 420 A non-repetitive surge current (8.3 ms), features 2500 VRMS galvanic isolation per UL E81734, and operates with 50 mA gate trigger current at ≤1.5 V gate threshold - enabling robust triggering in battery charging and UPS systems.
For engineers reviewing the BTW68-1200RG datasheet, BTW68-1200RG pinout, BTW68-1200RG application, or BTW68-1200RG equivalent, key selection criteria include RMS on-state current rating (30 A), blocking voltage (1200 V), I²t fusing value (800 A²s), thermal resistance (1.1 °C/W junction-to-case), and UL-certified insulation integrity for safety-critical AC power control.
Technical Context
This device is a high-isolation, clip-assembled TRIAC optimized for phase-controlled AC power switching. Its internal ceramic pad enables 2500 VRMS insulation and supports operation up to 125 °C junction temperature, while the 100 A/µs critical di/dt rating ensures reliable turn-on under fast-rising load currents in welding and motor drive inverters.
The BTW68-1200RG uses a TOP3 insulated package with defined mechanical dimensions (e.g., G = 20.4–21.1 mm width, K = 3.4–3.65 mm lead spacing) and requires 1.05 N·m mounting torque. Its 2.1 V maximum on-state voltage at 60 A reduces conduction losses in high-current bypass applications.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 30 A - Sustains continuous AC load current without derating at Tc = 80 °C |
| VDRM / VRRM | 1200 V - Blocks peak reverse/forward voltage in full-wave AC line applications |
| IGT | 50 mA - Minimum gate current required to trigger conduction reliably |
| ITSM (8.3 ms) | 420 A - Withstands short-circuit surges in motor startup or welder arc initiation |
| I²t (fusing) | 800 A²s - Defines energy limit before thermal failure during fault conditions |
| Rth(j-c) | 1.1 °C/W - Enables efficient heat transfer to heatsink in high-power SSR designs |
| dV/dt (125 °C) | 250 V/µs - Resists false triggering from line transients in noisy industrial environments |
Pinout & Package
The BTW68-1200RG uses the TOP3 insulated package - a through-hole, high-voltage isolated housing with epoxy meeting UL94 V0 and lead-free construction. Dimensions include G = 20.4–21.1 mm width, K = 3.4–3.65 mm lead spacing, and recommended mounting torque of 1.05 N·m.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A (Anode 1) | Main current terminal (AC line side) | Carries full load current; electrically isolated from case by ceramic pad |
| K (Cathode) | Main current terminal (load side) | Reference node for gate drive; shares thermal path with case |
| G (Gate) | Control input | Triggers conduction when ≥50 mA applied; referenced to cathode |
Key Features
| Feature | Design Value |
|---|---|
| UL 2500 V RMS insulation | Enables safe operation in Class I AC mains-connected equipment without external isolation barriers |
| Clip assembly construction | Improves mechanical robustness and surge current handling vs. wire-bonded alternatives |
| 125 °C max operating junction temperature | Supports compact heatsink design in enclosed industrial enclosures |
| 2.1 V max VTM at 60 A | Reduces conduction loss to ≤126 W at rated current, lowering thermal management burden |
Applications
| Solid-State Relay (SSR) | Battery Charging System |
|---|---|
Use Scenario: High-reliability AC output switching in industrial PLC-mounted SSR modules. IC Role / Device Role / Timing Role: Main AC power switch controlled via optocoupler-driven gate signal. Use Value: 2500 VRMS isolation eliminates need for auxiliary isolation transformers in 240 VAC systems. | Use Scenario: Phase-angle controlled rectification in three-phase EV charger front-ends. IC Role / Device Role / Timing Role: Bidirectional AC line switch regulating DC bus voltage via firing angle modulation. Use Value: 1200 V blocking rating accommodates 690 VAC grid inputs with margin for transient overvoltage. |
| Uninterruptible Power Supply (UPS) | Industrial Welding System |
Use Scenario: Bypass switch transferring load between inverter and utility feed during maintenance. IC Role / Device Role / Timing Role: High-current AC transfer switch activated only during static bypass mode. Use Value: 420 A surge rating handles inrush current of downstream UPS transformer without degradation. | Use Scenario: Primary AC power control in resistance spot welders with rapid duty cycling. IC Role / Device Role / Timing Role: Line-frequency synchronized switch delivering pulsed current to welding electrodes. Use Value: 100 A/µs di/dt capability prevents misfiring during fast-rising secondary current transients. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-isolation AC power switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTW69-1200RG | Higher IT(RMS) = 40 A; same VDRM, package, and insulation | Required where sustained >30 A RMS load current exists (e.g., larger UPS bypass) | Select when thermal margin is constrained and higher conduction capacity is needed |
| T935-1200G | Lower IGT = 35 mA; Rth(j-c) = 1.3 °C/W; same TOP3 Ins. package | Better suited for low-power gate drive circuits with limited driver strength | Choose when gate driver ICs cannot source 50 mA but require same 1200 V rating |
Compared with BTW68-1200RG, BTW69-1200RG offers +10 A RMS headroom at identical voltage and isolation specs, while T935-1200G eases gate drive requirements but trades off thermal performance - making each suitable for distinct thermal and drive architecture constraints.
Availability
BTW68-1200RG is available at Aetrix Electronics and suitable for solid-state relays, uninterruptible power supplies, and industrial welding systems requiring stable component supply, long-term lifecycle support, and UL-certified high-voltage isolation.
Supply support for BTW68-1200RG 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, power, microcontroller, and sensor solutions for industrial, automotive, and consumer markets.
The BTW68 series belongs to ST's high-power thyristor product line, engineered specifically for ruggedized AC power control in safety-critical industrial equipment where galvanic isolation, surge resilience, and thermal reliability are mandatory.
FAQ
What is the maximum allowable case temperature for continuous 30 A operation?
The BTW68-1200RG sustains 30 A RMS on-state current at Tc = 80 °C, as specified in Table 1. Exceeding this case temperature requires linear derating per Figure 3 in DS6910 Rev 4 - at 100 °C case, maximum IT(RMS) drops to ~22 A. Heatsink design must maintain case temperature ≤80 °C under worst-case ambient and airflow conditions.
Does BTW68-1200RG support snubberless operation?
No - the device requires an external RC snubber network due to its dV/dt rating of only 250 V/µs at 125 °C. Without snubbing, voltage transients exceeding this rate (e.g., from inductive loads or grid switching) can cause false turn-on. ST recommends using a 100 Ω / 100 nF snubber across A–K per application note AN433.
Can BTW68-1200RG be used in DC applications?
No - it is a bidirectional thyristor (TRIAC variant) designed exclusively for AC line-frequency switching. In DC circuits, once triggered, it remains latched until current falls below holding current (IH ≤75 mA), making it unsuitable for DC choppers or PWM without forced commutation circuitry.
Is the TOP3 insulated package RoHS-compliant and halogen-free?
Yes - the BTW68-1200RG TOP3 insulated package is lead-free and complies with RoHS Directive 2011/65/EU. ST confirms halogen-free status per IEC 61249-2-21, with chlorine and bromine content <900 ppm each, as documented in ECOPACK® material declarations for this part number.
BTW68-1200RG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- TOP-3
- Packaging:
- Tube
- Product Status:
- Active
- Voltage - Off State:
- 1.2 kV
- Voltage - Gate Trigger (Vgt) (Max):
- 1.5 V
- Current - Gate Trigger (Igt) (Max):
- 50 mA
- Voltage - On State (Vtm) (Max):
- 2.1 V
- Current - On State (It (AV)) (Max):
- 19 A
- Current - On State (It (RMS)) (Max):
- 30 A
- Current - Hold (Ih) (Max):
- 75 mA
- Current - Off State (Max):
- 20 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 400A, 420A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TOP3
BTW68-1200RG FAQ
1.How can I place an order for BTW68-1200RG through Aetrix?
Please submit a Request for Quotation (RFQ) for BTW68-1200RG 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 BTW68-1200RG reliable?
The price and inventory of BTW68-1200RG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTW68-1200RG is usually 5 days.
3.What payment methods are accepted for BTW68-1200RG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTW68-1200RG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BTW68-1200RG?
BTW68-1200RG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BTW68-1200RG 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 BTW68-1200RG?
For technical support, including BTW68-1200RG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTW68-1200RG requirements.
6.How does Aetrix verify that BTW68-1200RG is sourced from the original manufacturer or authorized distributors?
All BTW68-1200RG 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 BTW68-1200RG meets industry standards.
7.What is the process for return or replacement of BTW68-1200RG?
All BTW68-1200RG units undergo pre-shipment inspection (PSI). If there is an issue with BTW68-1200RG, 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 BTW68-1200RG part is unused and in its original packaging.
Return procedure for BTW68-1200RG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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