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Vishay Semiconductor Opto Division VOR2121B8T
- Part No.:
- VOR2121B8T
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
VOR2121B8T.pdf
- Description:
- SSR RELAY SPST-NO 200MA 0-250V
- Quantity:
- Payment:
- Shipping:
Inventory:2,690
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Product details
Overview
VOR2121B8T from Vishay Semiconductors is a dual-channel, normally open, optically isolated solid-state relay (SPST, 1 Form A) with 250 V load voltage rating, 200 mA single-channel DC load current, and 12 Ω typical on-resistance - used for bounce-free AC/DC switching in telecom and industrial control interfaces.
For engineers reviewing the VOR2121B8T datasheet, VOR2121B8T pinout, VOR2121B8T application, or VOR2121B8T equivalent, this device delivers certified 5300 VRMS isolation, fast 0.2 ms turn-on time, low 0.4 mA typical input turn-on current, and SMD-8 packaging suitable for high-density automated assembly in safety-critical signal routing.
Technical Context
The VOR2121B8T integrates two independent GaAlAs IRED–MOSFET hybrid channels in a single SMD-8 package, each featuring galvanic isolation per UL 1577 and DIN EN 60747-5-5 (VDE 0884-5). Its output stage uses enhancement-mode MOSFETs enabling bidirectional AC/DC switching without external biasing.
Input-side drive requires only 0.4 mA typical forward current to activate, while maintaining <1 nA off-state leakage at ±100 V. Thermal derating is defined across –40 °C to +100 °C ambient, with output safety power rated at 640 mW (one channel) and 480 mW (dual channel).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - enables reinforced insulation for functional safety in Class I equipment per UL/cUL/VDE standards |
| Load Voltage Rating | 250 V - supports direct switching of 240 VAC mains-connected loads without external snubbers |
| On-Resistance (RON) | 12 Ω typical - limits I²R heating to <12 mW at 100 mA, enabling compact thermal design |
| Turn-On Time | 0.20 ms typical - ensures sub-millisecond response for real-time test equipment sequencing |
| Input Forward Current (IFon) | 0.4 mA typical - allows direct drive from low-power microcontroller GPIOs without buffer stages |
| Ambient Temperature Range | –40 °C to +100 °C - validated for operation in uncooled industrial enclosures and outdoor metering housings |
| Off-State Leakage | <1 nA at ±100 V - prevents false triggering in high-impedance sensor interface circuits |
Pinout & Package
SMD-8 surface-mount package with 1.27 mm pitch, 9.77 mm × 6.65 mm footprint, and 0.4 mm minimum insulation thickness - compliant with JEDEC MS-012AC and RoHS reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | IRED Anode / Cathode (Channel 1) | Optical input pair requiring series current limiting; polarity-sensitive for proper LED activation |
| 3, 4 | MOSFET Drain / Source (Channel 1) | Bidirectional AC/DC switch terminals; no body diode conduction path required |
| 5, 6 | IRED Anode / Cathode (Channel 2) | Independent optical input for second SSR channel; electrically isolated from Channel 1 |
| 7, 8 | MOSFET Drain / Source (Channel 2) | Second isolated output switch; shares same package thermal mass but no internal electrical coupling |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Zero mechanical contact wear or arcing - eliminates maintenance in automatic test equipment relay matrices |
| Low power consumption | 0.4 mA typical input drive reduces MCU I/O loading and system standby power by >90% vs. electromechanical relays |
| Hybrid GaAlAs IRED + MOSFET architecture | Combines high CTR efficiency with low RON and fast timing - avoids trade-offs between speed and power loss |
| Wide operating temperature range | Full spec compliance from –40 °C to +100 °C ambient - enables deployment in battery management systems without forced cooling |
| 5300 VRMS isolation | Meets reinforced insulation requirements for medical and industrial equipment without additional barrier components |
Applications
| Telecom Line Switching | Metering Interface Isolation |
|---|---|
|
Use Scenario: Routing analog voice or data signals between PSTN lines and codec ICs in VoIP gateways. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated SPST switching of tip/ring pairs under microcontroller control. Use Value: Eliminates contact oxidation and timing jitter seen in EM relays, ensuring consistent line impedance and call setup reliability over 10+ years. |
Use Scenario: Isolating pulse outputs from kWh meters to prevent ground-loop interference in smart grid concentrators. IC Role / Device Role / Timing Role: Optically coupled switch translating meter pulses into clean, noise-immune logic-level signals for MCU counting. Use Value: 5300 VRMS isolation blocks common-mode transients from distribution transformers, preventing false pulse registration. |
| Industrial PLC I/O Modules | Battery Management System (BMS) Safety Switching |
|
Use Scenario: Driving 24 VDC solenoid valves and indicator lamps in factory automation cabinets. IC Role / Device Role / Timing Role: Dual-channel SSR replacing discrete optocoupler + MOSFET designs to reduce BOM count and PCB area. Use Value: 200 mA per channel supports direct drive of standard industrial loads; SMD-8 footprint enables 2× density vs. DIP-8 alternatives. |
Use Scenario: Disconnecting cell stack monitoring circuits during fault conditions in EV battery packs. IC Role / Device Role / Timing Role: Safety-isolated switch enabling rapid, controlled isolation of voltage sense lines from main controller. Use Value: 0.2 ms turn-on time meets ISO 26262 ASIL-B diagnostic response requirements; 12 Ω RON minimizes measurement error in shunt-based sensing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar solid-state relay applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLP241B(D4-TP,F) | Single-channel, 400 V load rating, 1.2 Ω RON, 5000 VRMS isolation - higher voltage but no dual-channel integration | Requires two devices to match VOR2121B8T's dual functionality; better suited for high-voltage, low-current sensing | Select when >250 V load handling is mandatory and board space permits duplication |
| PS8501-AX | Dual-channel, 400 V load rating, 1.5 Ω RON, 3750 VRMS isolation - lower isolation voltage, higher RON, different SMD-8 pinout | Not pin-compatible; requires PCB redesign; lacks VDE certification and safety power derating curves | Consider only if cost sensitivity outweighs safety certification and thermal performance requirements |
Compared with TLP241B(D4-TP,F) and PS8501-AX, the VOR2121B8T uniquely combines dual-channel integration, 5300 VRMS VDE-certified isolation, and 12 Ω RON in a single SMD-8 package - delivering optimal balance of safety margin, thermal efficiency, and layout simplicity for industrial and metering applications.
Availability
VOR2121B8T is available at Aetrix Electronics and suitable for telecom line switching, industrial PLC I/O modules, battery management system safety switching, and smart metering interfaces requiring stable component supply and long-term lifecycle support.
Supply support for VOR2121B8T 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 Intertechnology is a global manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.
The VOR2121 series is part of Vishay's optically isolated solid-state relay product line, engineered for zero-bounce, long-life switching in safety-critical industrial, telecom, and energy metering systems where electromechanical relay wear and EMI are unacceptable.
FAQ
What is the maximum continuous load current per channel for VOR2121B8T at 100 °C ambient?
The VOR2121B8T supports 140 mA continuous DC load current when both channels operate simultaneously at 25 °C ambient. At 100 °C ambient, derating curves show usable current drops to approximately 90 mA per channel for dual-channel operation - confirmed by Figure 4 in the official Vishay datasheet (Doc #84302, Rev. 1.2). This thermal limit ensures junction temperature remains below 125 °C under worst-case convection conditions. Always verify PCB copper area and airflow in final layout.
Does VOR2121B8T support AC load switching, and what is its peak AC voltage rating?
Yes, the VOR2121B8T supports bidirectional AC load switching up to 250 V peak (equivalent to ~177 V RMS), as specified in the "DC or peak AC load voltage" absolute maximum rating (VL = 250 V). Its MOSFET output stage has no inherent polarity limitation, enabling true AC conduction without external diodes or bridge configurations. The device maintains <1 nA off-state leakage at ±200 V, confirming robust blocking capability across full AC half-cycles.
What is the creepage and clearance distance for VOR2121B8T in its SMD-8 package?
The VOR2121B8T in SMD-8 package provides ≥8 mm creepage distance and ≥8 mm clearance distance between input and output sides, as certified per DIN EN 60747-5-5 (VDE 0884-5) and documented in the Safety and Insulation Ratings table (page 3, Doc #84302). These distances meet Pollution Degree 2 requirements and enable use in reinforced insulation applications up to 300 V working voltage without additional spacing on PCB.
Can VOR2121B8T be driven directly from a 3.3 V microcontroller GPIO without a current-limiting resistor?
No - VOR2121B8T requires an external series current-limiting resistor even when driven from 3.3 V. Its IRED forward voltage is 1.4–1.6 V at 10 mA, so a 3.3 V source would deliver ~1.7–1.9 mA without resistance - insufficient for guaranteed turn-on (typical IFon = 0.4 mA, max = 2 mA). A 1.0 kΩ resistor yields ~1.7 mA at 3.3 V, meeting typical and worst-case turn-on thresholds while staying within the 50 mA absolute maximum IF rating.
Is VOR2121B8T compliant with automotive AEC-Q101 qualification standards?
No, the VOR2121B8T is not AEC-Q101 qualified. Vishay's official documentation (Doc #84302) specifies industrial-grade qualification only, with operating ambient range of –40 °C to +100 °C and storage up to +150 °C. While it meets key environmental stresses, it lacks the extended temperature cycling, humidity testing, and failure analysis required for AEC-Q101. For automotive applications, consult Vishay's AQ-series optocouplers or contact their automotive support team for qualified alternatives.
VOR2121B8T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- VOR2121
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A) x 2
- Output Type:
- AC, DC
- Voltage - Input:
- 1.36VDC
- Voltage - Load:
- 0 V ~ 250 V
- Load Current:
- 200 mA
- On-State Resistance (Max):
- 15 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 100°C
- Supplier Device Package:
- 8-SMD
- Approval Agency:
- cUL, DIN, UL
- Grade:
- -
- Qualification:
- -
VOR2121B8T FAQ
1.How can I place an order for VOR2121B8T through Aetrix?
Please submit a Request for Quotation (RFQ) for VOR2121B8T 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 VOR2121B8T reliable?
The price and inventory of VOR2121B8T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VOR2121B8T is usually 5 days.
3.What payment methods are accepted for VOR2121B8T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VOR2121B8T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VOR2121B8T?
VOR2121B8T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VOR2121B8T 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 VOR2121B8T?
For technical support, including VOR2121B8T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VOR2121B8T requirements.
6.How does Aetrix verify that VOR2121B8T is sourced from the original manufacturer or authorized distributors?
All VOR2121B8T 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 VOR2121B8T meets industry standards.
7.What is the process for return or replacement of VOR2121B8T?
All VOR2121B8T units undergo pre-shipment inspection (PSI). If there is an issue with VOR2121B8T, 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 VOR2121B8T part is unused and in its original packaging.
Return procedure for VOR2121B8T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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