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Vishay Semiconductor Opto Division VOR2121B8
- Part No.:
- VOR2121B8
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
VOR2121B8.pdf
- Description:
- SSR RELAY SPST-NO 200MA 0-250V
- Quantity:
- Payment:
- Shipping:
Inventory:4,111
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Product details
Overview
VOR2121B8 from Vishay Semiconductors is a dual-channel, normally open solid-state relay (SPST-1 Form A) with optically isolated 5300 VRMS insulation, 250 V load voltage rating, and 12 Ω typical on-resistance, used for bounce-free AC/DC switching in industrial control and battery management systems.
For engineers reviewing the VOR2121B8 datasheet, VOR2121B8 pinout, VOR2121B8 application, or VOR2121B8 equivalent, key selection criteria include isolation voltage compliance (UL/cUL/VDE), dual-channel derating (140 mA @ 25 °C), SMD-8 package thermal performance, and GaAlAs IRED drive efficiency at ≤2 mA turn-on current.
Technical Context
The VOR2121B8 integrates two independent optically coupled channels, each combining a high-efficiency GaAlAs infrared LED input stage with a high-performance MOSFET output switch. Its hybrid architecture enables clean, bounce-free switching across -40 °C to +100 °C ambient temperature range.
Each channel supports bidirectional load switching up to 250 V (DC or peak AC) with 12 Ω typical RON and <1 nA off-state leakage at ±100 V. Input-to-output capacitance is 0.4 pF, ensuring minimal signal coupling and high noise immunity in sensitive instrumentation interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - meets UL 1577, cUL, and DIN EN 60747-5-5 (VDE 0884-5) for reinforced insulation in safety-critical systems |
| Load Voltage Rating | 250 V DC / peak AC - supports universal AC line sensing and DC battery-side switching without external snubbers |
| On-Resistance (RON) | 12 Ω typical - ensures low conduction loss (<120 mW at 100 mA), enabling direct drive of solenoids and relays |
| Turn-On/Off Time | 0.20 ms / 0.03 ms typical - enables high-speed sequencing in automatic test equipment and telecom switching |
| Ambient Temperature Range | -40 °C to +100 °C - validated operation in harsh industrial enclosures and automotive under-hood environments |
| Input Forward Current (Turn-On) | 0.4–2 mA typical - allows direct microcontroller GPIO drive without external current amplification |
| Off-State Leakage | <1 nA at ±100 V - guarantees signal integrity in high-impedance metering and sensor front-end circuits |
Pinout & Package
SMD-8 surface-mount package (9.80 mm × 6.65 mm × 3.55 mm), RoHS-compliant, moisture sensitivity level 1, compatible with J-STD-020 lead-free reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | IRED Anode / Cathode (Channel 1) | Optically couples to Channel 1 MOSFET; IFon ≤ 2 mA enables direct MCU-level drive |
| 3, 4 | Output Load Terminals (Channel 1) | SPST normally open switch; rated 250 V, 200 mA single-channel, bidirectional conduction |
| 5, 6 | IRED Anode / Cathode (Channel 2) | Independent optical input; electrically isolated from Channel 1; supports asynchronous control |
| 7, 8 | Output Load Terminals (Channel 2) | Second SPST switch; shares same 250 V/140 mA dual-channel derated rating as Channel 1 |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Eliminates mechanical contact arcing and EMI in precision timing and data acquisition systems |
| Low power consumption input | 0.4 mA typical turn-on current reduces system standby power and extends battery life in portable BMS |
| Wide operating temperature range | -40 °C to +100 °C ambient enables deployment in uncooled industrial PLC modules and EV charging controllers |
| High isolation robustness | 8000 Vpeak transient isolation voltage and ≥10¹² Ω insulation resistance ensure long-term reliability in noisy factory floors |
| Hybrid MOSFET output architecture | Combines low RON (12 Ω) with high off-resistance (>1 GΩ) for precise signal routing in automated test fixtures |
Applications
| Telecom Line Switching | Metering Input Isolation |
|---|---|
|
Use Scenario: Remote switching of POTS line pairs in DSLAMs and VoIP gateways. IC Role / Device Role / Timing Role: Dual-channel SPST relay isolating subscriber line interface circuits from central office logic. Use Value: 5300 VRMS isolation prevents ground loop faults; 0.03 ms turn-off time supports rapid line seizure protocols. |
Use Scenario: Galvanic isolation of voltage/current sensing inputs in smart electricity meters. IC Role / Device Role / Timing Role: Optically isolated switch routing analog measurement paths while blocking high-voltage transients. Use Value: <1 nA off-state leakage preserves ADC accuracy; 250 V rating covers surge protection requirements per IEC 61000-4-5. |
| Industrial PLC I/O Modules | Battery Management System (BMS) |
|
Use Scenario: Safe isolation of 24 V DC control outputs driving solenoid valves and indicator lamps. IC Role / Device Role / Timing Role: Dual SSR replacing electromechanical relays in DIN-rail mounted I/O expansion cards. Use Value: 12 Ω RON minimizes self-heating at 200 mA loads; SMD-8 footprint enables compact 16-channel module designs. |
Use Scenario: Cell balancing and pack isolation switching in lithium-ion battery packs for EVs and energy storage. IC Role / Device Role / Timing Role: Bidirectional AC/DC switch isolating individual cell monitoring circuits from main pack bus. Use Value: -40 °C to +100 °C operation supports under-hood BMS; 140 mA dual-channel rating matches typical balancing current limits. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar solid-state relay applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| VOR2121A8 | DIP-8 through-hole package; identical electrical specs and safety ratings | Preferred for prototyping, manual assembly, or legacy board designs requiring through-hole mounting | Select VOR2121A8 when DIP-8 mechanical stability or hand-soldering is required over SMD density |
| IXYS CPC1976Y | Single-channel, 400 V load rating, 35 Ω RON, 4000 VRMS isolation; different pinout and package (SOIC-8) | Higher voltage capability but lower current density and no dual-channel integration | Choose CPC1976Y only if 400 V load handling is mandatory and dual-channel consolidation is not needed |
Compared with VOR2121A8, the VOR2121B8 offers superior board-space efficiency and reflow compatibility; versus CPC1976Y, it delivers dual-channel integration, lower RON, and higher isolation-making it optimal for space-constrained, high-reliability industrial and BMS applications.
Availability
VOR2121B8 is available at Aetrix Electronics and suitable for industrial controls, battery management systems, and automatic test equipment requiring stable component supply with full traceability and lifecycle support.
Supply support for VOR2121B8 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 semiconductor manufacturer specializing in discrete components, optoelectronics, and passive devices with emphasis on reliability and high-performance specifications.
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 infrastructure applications.
FAQ
What is the maximum continuous load current for VOR2121B8 when both channels operate simultaneously?
The VOR2121B8 supports 140 mA continuous DC load current per channel when both channels are active at 25 °C ambient temperature. This derated value accounts for thermal coupling between channels in the SMD-8 package. At elevated temperatures, the safe operating current decreases per Figure 4 in the datasheet. The VOR2121B8 must be operated within its 480 mW dual-channel output safety power limit to maintain reliability.
Does VOR2121B8 support AC load switching, and what is its peak AC voltage rating?
Yes, the VOR2121B8 supports both DC and AC load switching. Its peak AC load voltage rating is 250 V, matching its DC rating. This enables use in universal-input AC sensing, relay replacement, and bidirectional signal routing without polarity constraints. The MOSFET output structure inherently supports symmetrical conduction, and the device has been validated per DIN EN 60747-5-5 for AC applications.
What is the minimum forward current required to reliably turn on VOR2121B8 at 100 °C ambient temperature?
At 100 °C ambient, the VOR2121B8 requires a minimum forward current of approximately 0.8 mA to guarantee turn-on, based on the normalized forward current curve (Figure 7) referenced to 25 °C. The datasheet specifies IFon = 0.4–2 mA typical at 25 °C, and the curve shows ~1.6× increase at 100 °C. Designers should target ≥1.2 mA to ensure margin across process and temperature variation for the VOR2121B8.
How does the isolation performance of VOR2121B8 compare to UL 1577 and VDE 0884-5 requirements?
The VOR2121B8 exceeds both standards: it achieves 5300 VRMS isolation (UL 1577) and 890 Vpeak repetitive peak isolation voltage (DIN EN 60747-5-5 / VDE 0884-5), with 8000 Vpeak transient withstand. Its creepage and clearance distances meet ≥8 mm for SMD-8, and insulation thickness is ≥0.4 mm. These values satisfy reinforced insulation requirements for functional safety up to 250 V working voltage, as confirmed in the Safety and Insulation Ratings table of the VOR2121B8 datasheet.
Can VOR2121B8 be used in battery-powered applications with ultra-low quiescent current requirements?
Yes-the VOR2121B8 draws only 0.05–0.35 mA during turn-off (IFoff), and its IRED reverse current is ≤10 μA. With no bias current required in the off state beyond leakage, the VOR2121B8 enables micropower operation in battery-backed security sensors and portable diagnostic tools. Its 0.4 mA typical turn-on current further minimizes average power draw during active periods, making it suitable for multi-year battery life designs.
VOR2121B8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- VOR2121
- Packaging:
- Tube
- 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:
- -
VOR2121B8 FAQ
1.How can I place an order for VOR2121B8 through Aetrix?
Please submit a Request for Quotation (RFQ) for VOR2121B8 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 VOR2121B8 reliable?
The price and inventory of VOR2121B8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for VOR2121B8 is usually 5 days.
3.What payment methods are accepted for VOR2121B8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for VOR2121B8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for VOR2121B8?
VOR2121B8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your VOR2121B8 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 VOR2121B8?
For technical support, including VOR2121B8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your VOR2121B8 requirements.
6.How does Aetrix verify that VOR2121B8 is sourced from the original manufacturer or authorized distributors?
All VOR2121B8 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 VOR2121B8 meets industry standards.
7.What is the process for return or replacement of VOR2121B8?
All VOR2121B8 units undergo pre-shipment inspection (PSI). If there is an issue with VOR2121B8, 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 VOR2121B8 part is unused and in its original packaging.
Return procedure for VOR2121B8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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