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STMicroelectronics BTA25-800BW
- Part No.:
- BTA25-800BW
- Manufacturer:
- STMicroelectronics
- Category:
- TRIACs
- Package:
- RD91-3 (Insulated)
- Datasheet:
-
BTA25-800BW.pdf
- Description:
- TRIAC ALTERNISTOR 800V 25A RD91
- Quantity:
- Payment:
- Shipping:
Inventory:6,618
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Product details
Overview
BTA25-800BW from STMicroelectronics is a snubberless 3-quadrant triac in TO-220AB insulated package, rated for 25 A RMS on-state current and 800 V repetitive peak off-state voltage, with 50 mA gate trigger current (IGT), designed for phase-controlled AC switching in lighting dimmers and motor speed controllers.
For engineers reviewing the BTA25-800BW datasheet, BTA25-800BW pinout, BTA25-800BW application, or BTA25-800BW equivalent, this device supports high commutation capability (dV/dt ≥ 1000 V/µs, dI/dt ≥ 22 A/ms at 125 °C), low thermal resistance (Rth(j-c) = 1.7 °C/W), and UL1557 recognition - critical for reliable solid-state relay and industrial AC load control design.
Technical Context
This triac operates in three quadrants (I, II, III) with snubberless capability, enabling robust turn-on without external RC snubbers under high dV/dt stress. Its gate trigger threshold (VGT ≤ 1.3 V) and low holding current (IH ≤ 75 mA at 125 °C) ensure stable latching across temperature.
Thermal performance is defined by junction-to-case resistance of 1.7 °C/W (insulated TO-220AB) and maximum junction temperature of +125 °C. The 2.5 kV insulation rating (1 min RMS) supports reinforced isolation in mains-connected equipment.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 25 A - Sustains continuous AC load current up to 25 A at Tc = 75 °C in insulated TO-220AB package. |
| VDRM / VRRM | 800 V - Blocks 800 V repetitive peak off-state voltage, suitable for 230 VAC + surge margin applications. |
| IGT (max) | 50 mA - Maximum gate trigger current required for reliable turn-on in all three active quadrants. |
| dV/dt (min) | 1000 V/µs - Minimum critical rate of rise of off-state voltage before false triggering; enables snubberless operation. |
| (dI/dt)c (min) | 22 A/ms - Minimum critical rate of decrease of on-state current to avoid commutation failure during zero-crossing. |
| Rth(j-c) | 1.7 °C/W - Junction-to-case thermal resistance defines heatsink sizing requirement for thermal management. |
| VINS | 2.5 kV RMS - Insulation withstand voltage (1 minute), certifying reinforced isolation for safety-critical AC interfaces. |
Pinout & Package
TO-220AB insulated package with creepage/clearance enhanced for reinforced insulation. Mounting tab is electrically isolated from terminals.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (MT1) | Main Terminal 1 | Reference terminal for gate drive and current return path; polarity-sensitive in quadrant-dependent conduction. |
| A2 (MT2) | Main Terminal 2 | High-side AC line connection; voltage referenced to A1 determines quadrant behavior during triggering. |
| G | Gate | Control input requiring ≥50 mA pulse to initiate conduction; compatible with standard microcontroller GPIO via driver stage. |
Key Features
| Feature | Design Value |
|---|---|
| Snubberless 3-quadrant operation | Eliminates need for external RC snubber networks in phase-control circuits, reducing BOM count and PCB area. |
| UL1557 recognition | Validated insulation system (file #81734) meets reinforced isolation requirements for mains-connected equipment. |
| Low Rth(j-c) = 1.7 °C/W | Enables higher power density and simplified thermal design versus non-insulated alternatives with Rth(j-c) = 0.8 °C/W. |
| RoHS & ECOPACK2 compliant | Halogen-free molding compound and lead-free terminations meet global environmental compliance mandates. |
| High dI/dt immunity (22 A/ms) | Prevents commutation failure during fast current decay, critical for inductive motor and transformer loads. |
Applications
| Light Dimming Systems | Industrial Motor Speed Control |
|---|---|
|
Use Scenario: Phase-angle controlled dimming of incandescent/halogen lamps in residential and commercial lighting. IC Role / Device Role / Timing Role: Main AC power switch triggered synchronously with zero-crossing detection to regulate RMS voltage delivered to lamp filament. Use Value: Enables smooth, flicker-free dimming without snubber components while maintaining >800 V blocking margin against line surges. |
Use Scenario: Single-phase induction motor speed regulation in HVAC blowers, pumps, and fans. IC Role / Device Role / Timing Role: Bidirectional AC switch modulating conduction angle to adjust effective motor torque and rotational speed. Use Value: Supports high dI/dt (22 A/ms) and dV/dt (1000 V/µs) immunity required for inductive kickback suppression without snubbers. |
| Static Relay Modules | Heating Element Regulation |
|
Use Scenario: Solid-state replacement for electromechanical relays in PLC output modules and building automation systems. IC Role / Device Role / Timing Role: Isolated AC load switch providing silent, bounce-free on/off control with 2.5 kV insulation barrier. Use Value: UL1557 certification ensures compliance with IEC 61812-1 for safety-rated relay replacements in Class I equipment. |
Use Scenario: Proportional power delivery to resistive heating elements in ovens, water heaters, and industrial process controls. IC Role / Device Role / Timing Role: High-current AC switch implementing burst-fire or phase-control algorithms to maintain precise temperature setpoints. Use Value: 25 A RMS rating and low on-state voltage (VTM ≤ 1.55 V) minimize conduction losses and thermal stress during continuous duty. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar triac-based AC switching applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BTB24-800BW | TO-220AB uninsulated package; Rth(j-c) = 0.8 °C/W; no isolation between tab and A2. | Requires insulated mounting hardware; unsuitable where reinforced isolation is mandated. | Select when thermal performance is prioritized over safety isolation and board-level creepage is managed externally. |
| T2535-800G | D²PAK surface-mount package; 35 mA IGT; Rth(j-c) = 0.8 °C/W; no isolation. | Not pin-compatible; requires re-layout; lacks 2.5 kV insulation rating. | Choose for automated assembly and space-constrained designs where isolation is handled at system level. |
Compared with BTB24-800BW and T2535-800G, BTA25-800BW uniquely provides certified reinforced insulation (2.5 kV, UL1557) in a through-hole format, making it the only option among the three qualified for safety-critical, user-accessible AC load switching without additional isolation barriers.
Availability
BTA25-800BW is available at Aetrix Electronics and suitable for light dimming systems, industrial motor speed control, and static relay modules requiring stable component supply, long-lifecycle support, and certified isolation performance.
Supply support for BTA25-800BW 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, MCU, and sensor solutions for industrial, automotive, and consumer markets.
BTA25-800BW belongs to ST's high-reliability power discrete portfolio, engineered specifically for robust AC mains switching in safety-critical industrial and building automation applications.
FAQ
Is BTA25-800BW compatible with zero-crossing trigger circuits?
No - BTA25-800BW is a 3-quadrant snubberless triac optimized for phase-angle control, not zero-crossing switching. Its gate trigger characteristics (IGT = 50 mA, VGT ≤ 1.3 V) and high dV/dt immunity (1000 V/µs) are tailored for precise conduction-angle modulation, not synchronous turn-on at voltage zero crossings.
What is the maximum allowable case temperature for continuous 25 A operation?
The datasheet specifies IT(RMS) = 25 A at Tc = 75 °C for the insulated TO-220AB package. Exceeding 75 °C case temperature reduces allowable RMS current per Figure 2; sustained operation above this limit risks thermal runaway due to increased on-state voltage and reduced dI/dt immunity.
Does BTA25-800BW require a heat sink in typical 230 VAC applications?
Yes - with Rth(j-c) = 1.7 °C/W and typical on-state power dissipation exceeding 3 W at 25 A, a properly sized heat sink is mandatory to maintain Tj ≤ 125 °C. Thermal design must account for ambient temperature, airflow, and insulation derating due to the isolated package construction.
Can BTA25-800BW replace BTA16-600B in an existing design?
No - BTA25-800BW has higher voltage rating (800 V vs. 600 V), higher current rating (25 A vs. 16 A), and different gate sensitivity (50 mA snubberless vs. 50 mA standard). Direct replacement requires verification of thermal margin, PCB layout clearance for insulated tab, and compatibility with existing gate drive timing and current capability.
BTA25-800BW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- Snubberless™
- Package/Case:
- RD91-3 (Insulated)
- Packaging:
- Bulk
- Product Status:
- Active
- Triac Type:
- Alternistor - Snubberless
- Voltage - Off State:
- 800 V
- Current - On State (It (RMS)) (Max):
- 25 A
- Voltage - Gate Trigger (Vgt) (Max):
- 1.3 V
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 250A, 260A
- Current - Gate Trigger (Igt) (Max):
- 50 mA
- Current - Hold (Ih) (Max):
- 75 mA
- Configuration:
- Single
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis Mount
- Supplier Device Package:
- RD91
BTA25-800BW FAQ
1.How can I place an order for BTA25-800BW through Aetrix?
Please submit a Request for Quotation (RFQ) for BTA25-800BW 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 BTA25-800BW reliable?
The price and inventory of BTA25-800BW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTA25-800BW is usually 5 days.
3.What payment methods are accepted for BTA25-800BW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTA25-800BW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BTA25-800BW?
BTA25-800BW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BTA25-800BW 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 BTA25-800BW?
For technical support, including BTA25-800BW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTA25-800BW requirements.
6.How does Aetrix verify that BTA25-800BW is sourced from the original manufacturer or authorized distributors?
All BTA25-800BW 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 BTA25-800BW meets industry standards.
7.What is the process for return or replacement of BTA25-800BW?
All BTA25-800BW units undergo pre-shipment inspection (PSI). If there is an issue with BTA25-800BW, 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 BTA25-800BW part is unused and in its original packaging.
Return procedure for BTA25-800BW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BTA25-800BW Tags
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Z0103NN5AA4
STMicroelectronics
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Z0107MNT1G
Littelfuse Inc.
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Z0103MNT1G
Littelfuse Inc.
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BTA08-600CWRG
STMicroelectronics
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T835H-6G-TR
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