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STMicroelectronics BTW69-1200RG
- Part No.:
- BTW69-1200RG
- Manufacturer:
- STMicroelectronics
- Category:
- SCRs
- Package:
- TOP-3
- Datasheet:
-
BTW69-1200RG.pdf
- Description:
- SCR 1.2KV 50A TOP3
- Quantity:
- Payment:
- Shipping:
Inventory:350
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Product details
Overview
BTW69-1200RG from STMicroelectronics is a 50 A RMS, 1200 V repetitive peak off-state voltage (VDRM/VRRM) insulated-packaged SCR thyristor in RD91 package, featuring 80 mA gate trigger current (IGT), 1.0 °C/W junction-to-case thermal resistance, and 2500 VRMS insulation rating - deployed in high-power solid-state relays and industrial welding controls.
For engineers reviewing the BTW69-1200RG datasheet, BTW69-1200RG pinout, BTW69-1200RG application, or BTW69-1200RG equivalent, key selection criteria include surge current capability (610 A non-repetitive), critical dV/dt (1000 V/µs at 125 °C), on-state voltage (1.9 V max at 100 A), thermal performance under forced conduction cooling, and UL 1557-certified insulation integrity.
Technical Context
This SCR operates as a phase-controlled, gate-triggered unidirectional power switch with latching behavior after turn-on. Its design supports high-current, low-duty-cycle switching in line-synchronized AC power control circuits where robust commutation and thermal stability are essential.
The RD91 insulated package enables direct mounting to heatsinks without additional isolation hardware, while clip-bonding reduces bond wire inductance and improves I²t handling. Gate sensitivity (IGT ≤ 80 mA) and holding current (IH ≤ 150 mA) ensure reliable triggering and stable conduction across -40 °C to +125 °C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(RMS) | 50 A - Sustains continuous full-sine AC load current at 70 °C case temperature |
| VDRM / VRRM | 1200 V - Blocks 1200 V peak reverse or off-state voltage without conduction |
| IGT | 80 mA max - Maximum gate current required to reliably trigger conduction at 25 °C |
| Rth(j-c) | 1.0 °C/W - Enables 50 W dissipation with only 50 °C temperature rise from junction to case |
| Vins | 2500 VRMS - Withstands 1-minute AC insulation test per UL 1557 (E81734) |
| dV/dt | 1000 V/µs min - Resists false triggering from rapid voltage transients at 125 °C junction |
| ITSM | 610 A - Non-repetitive surge current for 8.3 ms half-sine, critical for welder arc initiation |
Pinout & Package
RD91 is an insulated, stud-mount power package with integrated ceramic isolation barrier, designed for conduction cooling via M6 threaded stud (0.9–1.2 N·m torque). Dimensions: 40.0 × 27.0 × 14.0 mm (L × W × H), weight 20 g.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main current entry terminal | High-current path into device; electrically isolated from heatsink by ceramic base |
| Cathode (K) | Main current exit terminal | Connected to heatsink mount surface; requires insulating washer if heatsink grounded |
| Gate (G) | Control input for turn-on | Low-energy trigger point; must be driven with ≥2×IGT pulse (≤20 µs) for reliable firing |
Key Features
| Feature | Design Value |
|---|---|
| Clip-bonded die assembly | Eliminates bond wires to reduce parasitic inductance and increase surge current endurance (I²t = 1680 A²s) |
| UL 1557-certified insulation | 2500 VRMS isolation barrier validated for safety-critical industrial equipment |
| Low Rth(j-c) | 1.0 °C/W thermal resistance enables compact heatsink sizing in space-constrained welders and SSRs |
| High dV/dt immunity | 1000 V/µs minimum prevents spurious turn-on during fast-switching AC line transients |
| RoHS-compliant construction | Meets EU Directive 2002/95/EC; no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE |
Applications
| Industrial Welding Power Control | Solid-State Relay (SSR) |
|---|---|
Use Scenario: Precise AC power delivery to welding torch electrodes during stick or TIG processes with rapid on/off cycling. IC Role / Device Role / Timing Role: Main power switch triggered synchronously with AC zero-crossing to regulate average energy per cycle. Use Value: 610 A surge rating handles arc ignition spikes; 1200 V blocking withstands open-circuit line transients up to 1.7× nominal voltage. | Use Scenario: Replacement for electromechanical relays in PLC output modules controlling HVAC compressors or lighting banks. IC Role / Device Role / Timing Role: Bidirectional AC switching element (paired with anti-parallel SCR or triac) enabling silent, bounce-free contactless operation. Use Value: 2500 VRMS insulation eliminates need for external isolation transformers; UL certification simplifies end-equipment safety approval. |
| High-Power Motor Soft Starter | DC Excitation Control for Electromagnets |
Use Scenario: Gradual ramp-up of stator voltage in 3-phase induction motors to limit inrush current during startup. IC Role / Device Role / Timing Role: Phase-angle controlled thyristor in back-to-back configuration per phase leg. Use Value: 50 A RMS rating supports motors up to ~25 kW; 1.0 °C/W thermal resistance allows sustained partial-conduction duty without derating. | Use Scenario: Regulated DC field excitation for large industrial lifting magnets or magnetic separators. IC Role / Device Role / Timing Role: Half-wave rectifier switch in transformer-fed DC supply, gated to adjust average magnetizing current. Use Value: Low VTM (1.9 V max) minimizes conduction loss in high-current DC paths; 150 mA holding current ensures stable latching during low-duty PWM control. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-current, insulated SCR applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST BR60-1200 | 60 A RMS rating, same 1200 V VDRM, but TO-247 package (non-insulated); Rth(j-c) = 0.8 °C/W | Requires external isolation hardware; better thermal performance but higher system-level BOM cost | Select when heatsink isolation is already implemented and higher continuous current is needed |
| Littelfuse S4065L | 40 A RMS, 600 V VDRM, insulated TO-220AB package; lower voltage rating and surge capacity | Not suitable for 400 VAC+ systems or welding surges; limited to light industrial SSRs | Select only for cost-sensitive, lower-voltage (<480 VAC) motor control where 1200 V margin is unnecessary |
Compared with BR60-1200 and S4065L, BTW69-1200RG uniquely balances 50 A current, 1200 V blocking, UL-certified insulation, and 1.0 °C/W thermal resistance in a single RD91 package - making it optimal for safety-critical, high-surge, medium-power AC switching where board space and isolation integration matter.
Availability
BTW69-1200RG is available at Aetrix Electronics and suitable for solid-state relays, industrial welding equipment, and high-power motor soft starters requiring stable component supply, long lifecycle support, and certified insulation integrity.
Supply support for BTW69-1200RG 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 microcontrollers, power devices, sensors, and analog ICs for industrial, automotive, and consumer markets.
BTW69-1200RG belongs to ST's high-power insulated SCR product line, engineered specifically for ruggedized AC power control in environments demanding safety certification, thermal resilience, and surge robustness - not general-purpose switching.
FAQ
What is the maximum allowable case temperature for continuous operation?
The BTW69-1200RG supports continuous operation up to 70 °C case temperature for its full 50 A RMS rating. Derating begins above this point: at 100 °C case, IT(AV) drops to approximately 20 A (180° conduction). Thermal design must maintain Tc ≤ 70 °C under worst-case ambient and airflow conditions to avoid exceeding junction limits.
Does BTW69-1200RG require a heat sink, and what mounting torque is specified?
Yes - mandatory conduction cooling via heatsink is required due to its 50 A rating and 1.0 °C/W Rth(j-c). It uses an M6 threaded stud in the RD91 package; ST specifies 0.9–1.2 N·m mounting torque. Under-torque increases thermal resistance; over-torque risks ceramic fracture or stud deformation, compromising insulation integrity.
Can BTW69-1200RG be used in DC applications?
Yes, but only in half-wave rectifier or DC chopper configurations where natural current zero-crossing occurs (e.g., inductive loads). It cannot self-commutate in pure resistive DC circuits. For forced-commutated DC switching, an external commutation circuit or GTO/IGBT is required - BTW69-1200RG's latching behavior mandates current interruption to turn off.
Is the 2500 VRMS insulation rating tested per cycle or continuously?
The 2500 VRMS insulation withstand is verified per UL 1557 as a 1-minute AC dielectric test applied between main terminals and the isolated metal base. It is not a continuous operating rating - the device must remain within its VDRM/VRRM (1200 V) and operational voltage limits during normal use. The 2500 VRMS value certifies safety isolation integrity under fault or transient overvoltage conditions.
BTW69-1200RG 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):
- 1.3 V
- Current - Gate Trigger (Igt) (Max):
- 80 mA
- Voltage - On State (Vtm) (Max):
- 1.9 V
- Current - On State (It (AV)) (Max):
- 32 A
- Current - On State (It (RMS)) (Max):
- 50 A
- Current - Hold (Ih) (Max):
- 150 mA
- Current - Off State (Max):
- 10 µA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 580A, 610A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- TOP3
BTW69-1200RG FAQ
1.How can I place an order for BTW69-1200RG through Aetrix?
Please submit a Request for Quotation (RFQ) for BTW69-1200RG 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 BTW69-1200RG reliable?
The price and inventory of BTW69-1200RG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BTW69-1200RG is usually 5 days.
3.What payment methods are accepted for BTW69-1200RG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BTW69-1200RG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BTW69-1200RG?
BTW69-1200RG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BTW69-1200RG 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 BTW69-1200RG?
For technical support, including BTW69-1200RG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BTW69-1200RG requirements.
6.How does Aetrix verify that BTW69-1200RG is sourced from the original manufacturer or authorized distributors?
All BTW69-1200RG 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 BTW69-1200RG meets industry standards.
7.What is the process for return or replacement of BTW69-1200RG?
All BTW69-1200RG units undergo pre-shipment inspection (PSI). If there is an issue with BTW69-1200RG, 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 BTW69-1200RG part is unused and in its original packaging.
Return procedure for BTW69-1200RG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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