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Vishay General Semiconductor - Diodes Division VS-22RIA120
- Part No.:
- VS-22RIA120
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Category:
- SCRs
- Package:
- TO-208AA, TO-48-3, Stud
- Datasheet:
-
VS-22RIA120.pdf
- Description:
- SCR 1.2KV 35A TO208AA
- Quantity:
- Payment:
- Shipping:
Inventory:2,469
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Product details
Overview
VS-22RIA120 from Vishay Semiconductors is a medium-power phase control thyristor (SCR) in stud-mount TO-48 (TO-208AA) package, rated for 22 A average on-state current, 1200 V repetitive peak off-state voltage (VDRM/VRRM), and 1.70 V maximum on-state voltage at 70 A and 25 °C. It operates across -65 °C to +125 °C junction temperature and delivers high dI/dt (160 A/μs) and dV/dt (100 V/μs) performance for industrial AC power control.
For engineers reviewing the VS-22RIA120 datasheet, VS-22RIA120 pinout, VS-22RIA120 application, or VS-22RIA120 equivalent, key selection criteria include its 1200 V blocking capability, 110 μs typical turn-off time (tq), 60 mA gate trigger current (IGT) at 25 °C, thermal resistance of 0.86 K/W (junction-to-case), and stud-base mechanical interface for heatsink mounting in phase-angle dimming and motor speed control circuits.
Technical Context
The VS-22RIA120 is a single-anode, single-cathode, single-gate silicon-controlled rectifier designed for half-wave or full-wave phase-controlled switching in AC line-frequency applications. Its triggering behavior is defined by gate threshold parameters (VGT = 2.0 V, IGT = 60 mA at TJ = 25 °C) and latching/holding currents (IL = 200 mA, IH = 130 mA), ensuring reliable turn-on under varying load and temperature conditions.
It features a low on-state slope resistance (rt1 = 14.9 mΩ at low conduction, rt2 = 13.4 mΩ at high conduction) and exhibits predictable transient thermal impedance (ZthJC), enabling accurate junction temperature estimation during pulsed operation. The device supports sinusoidal conduction angles from 30° to 180°, with thermal derating curves explicitly provided for case temperature limits up to 130 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| IT(AV) | 22 A average on-state current - defines continuous DC-equivalent conduction capability at 85 °C case temperature |
| VDRM / VRRM | 1200 V maximum repetitive peak off-state voltage - sets safe AC line voltage handling margin for 600 V RMS systems |
| VTM | 1.70 V max at 70 A, 25 °C - determines conduction loss and thermal dissipation in high-current phase-control stages |
| IGT | 60 mA max at TJ = 25 °C - specifies minimum gate drive current required for guaranteed turn-on under nominal conditions |
| tq | 110 μs typical turn-off time - governs minimum commutation interval and maximum operating frequency in forced-commutated circuits |
| RthJC | 0.86 K/W junction-to-case thermal resistance - enables direct heatsink thermal design without intermediate insulation layers |
| dV/dt | 100 V/μs critical rate of rise - defines immunity to false triggering from fast transients in noisy industrial environments |
Pinout & Package
VS-22RIA120 uses a stud-mount TO-48 (TO-208AA) package with three terminals: Anode (A), Cathode (C), and Gate (G). The anode is electrically connected to the metal stud base, which serves as both mechanical mounting point and primary heat path. Mounting torque is specified as 20 lbf·in (lubricated) or 25 lbf·in (non-lubricated) for 1/4"-28UNF-2A threads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (A) | Main power terminal (high-side switch node) | Electrically tied to stud base; requires insulated mounting hardware when referenced to ground or floating heatsinks |
| Cathode (C) | Main power return terminal (low-side reference) | Isolated metal tab; connects to load return path and gate drive common reference |
| Gate (G) | Control input for SCR turn-on | Low-energy trigger terminal; requires compliant gate resistor network to meet IGT, VGT, and dI/dt requirements |
Key Features
| Feature | Design Value |
|---|---|
| Improved glass passivation | Enables stable operation and long-term reliability at junction temperatures up to +125 °C without parameter drift |
| High dI/dt capability (160 A/μs) | Supports rapid current rise in inductive loads without false turn-on or latch-up during commutation |
| Low RthJC (0.86 K/W) | Reduces thermal bottleneck between die and heatsink, allowing higher power density in compact enclosures |
| Standard stud-mount TO-48 footprint | Ensures mechanical compatibility with legacy industrial heatsink fixtures and mounting hardware |
| 1200 V VDRM rating | Provides 2× safety margin over 600 V RMS mains (848 V peak), suitable for global 50/60 Hz AC distribution |
Applications
| AC Motor Speed Control | Industrial Heating Control |
|---|---|
Use Scenario: Variable-speed control of single-phase induction motors in HVAC blowers and conveyor drives using phase-angle firing. IC Role / Device Role / Timing Role: Main power switching element in series with motor winding; triggered at adjustable conduction angle per half-cycle to regulate RMS voltage. Use Value: Enables precise torque and speed regulation with minimal harmonic distortion due to deterministic turn-on timing and low VTM conduction loss. | Use Scenario: Closed-loop temperature regulation in resistive heating elements (e.g., ovens, furnaces) via proportional phase control. IC Role / Device Role / Timing Role: Line-synchronized power switch that modulates energy delivery by delaying turn-on within each AC half-cycle. Use Value: Delivers smooth, stepless power adjustment with <1% output ripple and no audible noise, leveraging 110 μs tq for clean zero-crossing commutation. |
| Light Dimming Systems | Welding Power Supplies |
Use Scenario: Mains-voltage dimming of incandescent and halogen lamps in commercial lighting infrastructure. IC Role / Device Role / Timing Role: High-current AC switch in leading-edge dimmer topology; gated synchronously with zero-crossing detection. Use Value: Supports 22 A continuous load (up to 2.6 kW at 120 V) with robust EMI immunity due to 100 V/μs dV/dt rating and glass-passivated junction. | Use Scenario: Primary switching element in single-phase rectifier-based welding inverters requiring controlled AC input stage. IC Role / Device Role / Timing Role: Phase-controlled rectifier switch feeding capacitor-input filter; operated at fixed or variable conduction angle for DC bus voltage regulation. Use Value: Handles 420 A non-repetitive surge (60 Hz) and 724 A²s I²t rating, enabling reliable arc ignition and short-circuit withstand in intermittent duty cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SCR-based phase control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ST122S1200 | 1200 V VDRM, 22 A IT(AV), TO-208AA package, but higher VTM (1.85 V) and lower dI/dt (120 A/μs) | Suitable for lower-switching-frequency heating controls where thermal margin exceeds 0.15 V conduction loss penalty | Select when gate drive simplicity is prioritized over peak efficiency and high-dI/dt inductive loads |
| IXYS MDA22A1200 | 1200 V VDRM, 22 A IT(AV), TO-208AA, with faster tq (90 μs) and higher dV/dt (200 V/μs), but requires tighter gate timing control | Better suited for high-frequency phase-shifted or forced-commutated topologies demanding sub-100 μs recovery | Prefer when designing for >400 Hz modulation or enhanced noise immunity in EMI-sensitive environments |
Compared with ST122S1200 and IXYS MDA22A1200, VS-22RIA120 offers balanced trade-offs: lower VTM than ST122S1200 reduces conduction loss, while its 110 μs tq and 100 V/μs dV/dt provide more forgiving gate timing margins than MDA22A1200-ideal for cost-sensitive industrial controls with standard TRIAC driver ICs.
Availability
VS-22RIA120 is available at Aetrix Electronics and suitable for AC motor speed control, industrial heating regulation, and lighting dimming systems requiring stable component supply, long-life reliability, and proven thermal performance in stud-mounted configurations.
Supply support for VS-22RIA120 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
Vishay Semiconductors is a global leader in discrete semiconductors, specializing in high-reliability diodes, thyristors, MOSFETs, and optoelectronics for industrial, automotive, and computing applications.
The VS-22RIA Series is part of Vishay's medium-power phase control thyristor family, engineered for rugged AC line switching in harsh environments where thermal stability, surge robustness, and long-term parameter consistency are critical.
FAQ
What is the maximum allowable case temperature for continuous operation of VS-22RIA120?
The VS-22RIA120 supports continuous operation at a maximum case temperature (TC) of 85 °C when delivering its rated 22 A average on-state current. Derating curves in the datasheet show allowable case temperature increases up to 130 °C for reduced conduction angles (e.g., 30°–90°), reflecting its optimized thermal design for phase-controlled duty cycles. The junction-to-case thermal resistance remains 0.86 K/W under DC conditions.
Does VS-22RIA120 require a heatsink, and what mounting torque is recommended?
Yes, VS-22RIA120 requires a heatsink due to its 0.86 K/W junction-to-case thermal resistance and 22 A IT(AV) rating. It must be mounted with proper thermal interface material and mechanical clamping. For the standard 1/4"-28UNF-2A stud, Vishay specifies a mounting torque of 20 lbf·in with lubricated threads or 25 lbf·in without lubrication. Overtorque risks damaging the TO-48 package seal; undertorque increases thermal resistance and risks thermal runaway.
What gate drive circuit is recommended for reliable triggering of VS-22RIA120?
A compliant gate drive for VS-22RIA120 should deliver ≥60 mA peak current and ≥2.0 V gate-to-cathode voltage at TJ = 25 °C, with pulse width ≥6 μs and rise time ≤0.1 μs. Vishay recommends a 10 V source with 20 Ω series resistance for rated dI/dt applications. Gate power limits are PGM = 8.0 W (peak) and PG(AV) = 2.0 W (average); exceeding these risks gate junction failure. The VS-22RIA120 datasheet provides load-line guidance in Figure 8.
Can VS-22RIA120 be used in DC applications, and what is its maximum non-repetitive surge rating?
VS-22RIA120 is designed for AC phase control and is not rated for sustained DC blocking; its VDRM/VRRM applies only to repetitive AC off-state conditions. For surge events, it supports 420 A peak one-cycle non-repetitive surge current at 60 Hz (8.3 ms) with no voltage reapplied, and 355 A when 100 % VRRM is reapplied post-surge. These ratings assume initial junction temperature at TJ maximum (125 °C) and define safe fault-handling capability in overload scenarios.
How does the 1200 V VDRM rating of VS-22RIA120 relate to real-world 230 V and 400 V AC systems?
The 1200 V VDRM rating of VS-22RIA120 provides a 2.9× safety margin over 400 V RMS three-phase line-to-line voltage (566 V peak) and a 5.2× margin over 230 V RMS single-phase (325 V peak), accommodating transient overvoltages, ringing, and line surges per IEC 61000-4-5. This ensures robust operation in global industrial grids without external snubbers in most cases, directly supporting compliance with EN 61800-3 and UL 508C for motor drive and heating equipment.
VS-22RIA120 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay General Semiconductor - Diodes Division
- Series:
- -
- Package/Case:
- TO-208AA, TO-48-3, Stud
- Packaging:
- Bulk
- Product Status:
- Active
- Voltage - Off State:
- 1.2 kV
- Voltage - Gate Trigger (Vgt) (Max):
- 2 V
- Current - Gate Trigger (Igt) (Max):
- 60 mA
- Voltage - On State (Vtm) (Max):
- 1.7 V
- Current - On State (It (AV)) (Max):
- 22 A
- Current - On State (It (RMS)) (Max):
- 35 A
- Current - Hold (Ih) (Max):
- 130 mA
- Current - Off State (Max):
- 10 mA
- Current - Non Rep. Surge 50, 60Hz (Itsm):
- 400A, 420A
- SCR Type:
- Standard Recovery
- Operating Temperature:
- -65°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Chassis, Stud Mount
- Supplier Device Package:
- TO-208AA (TO-48)
VS-22RIA120 FAQ
1.How can I place an order for VS-22RIA120 through Aetrix?
Please submit a Request for Quotation (RFQ) for VS-22RIA120 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 VS-22RIA120 reliable?
The price and inventory of VS-22RIA120 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VS-22RIA120 is usually 5 days.
3.What payment methods are accepted for VS-22RIA120?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VS-22RIA120 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VS-22RIA120?
VS-22RIA120 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VS-22RIA120 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 VS-22RIA120?
For technical support, including VS-22RIA120 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VS-22RIA120 requirements.
6.How does Aetrix verify that VS-22RIA120 is sourced from the original manufacturer or authorized distributors?
All VS-22RIA120 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 VS-22RIA120 meets industry standards.
7.What is the process for return or replacement of VS-22RIA120?
All VS-22RIA120 units undergo pre-shipment inspection (PSI). If there is an issue with VS-22RIA120, 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 VS-22RIA120 part is unused and in its original packaging.
Return procedure for VS-22RIA120:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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