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Vishay Semiconductor Opto Division LH1512BB
- Part No.:
- LH1512BB
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LH1512BB.pdf
- Description:
- RELAY SPST-NO/NC 200MA 0-200V
- Quantity:
- Payment:
- Shipping:
Inventory:1,883
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Product details
Overview
LH1512BB from Vishay Semiconductors is a dual 1 Form A/B, C solid-state relay in DIP-8 package, integrating infrared LED actuation with photodiode-driven MOSFET output switches. It delivers 200 V load voltage handling, 200 mA continuous load current, and 10 Ω typical on-resistance for telecom on/off-hook control and industrial signal routing.
For engineers reviewing the LH1512BB datasheet, LH1512BB pinout, LH1512BB application, or LH1512BB equivalent, this device supports independent normally open (S1/S1′) and normally closed (S2/S2′) switching with 3750 VRMS input-to-output isolation, current-limit protection, and bounce-free operation in through-hole mounting configurations.
Technical Context
The LH1512BB implements optically isolated control via an internal infrared LED coupled to a photodiode array that drives dual complementary MOSFET output stages - one configured as Form A (NO), the other as Form B (NC), combinable into Form C (SPDT). Its hybrid multichip construction enables galvanic separation between input and output domains.
Switching behavior is defined by LED forward current thresholds: 0.6 mA typical turn-on (NO) and 0.9 mA typical turn-on (NC) at 25 °C; turn-off currents are 0.5 mA (NO) and 1.0 mA (NC). Output stage includes integrated current limiting (360 mA typical) and maintains <1000 nA off-state leakage under ±100 V bias.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage | 200 V DC or peak AC - supports telecom ring signal and industrial line-level switching without external snubbing |
| Continuous Load Current | 200 mA - sufficient for driving relays, solenoids, and low-power analog signal paths |
| On-Resistance (RON) | 10 Ω typical - ensures minimal I²R heating and voltage drop in power-sensitive analog control loops |
| Input–Output Isolation | 3750 VRMS - meets UL, VDE, CQC, and FIMKO safety requirements for reinforced insulation |
| Turn-On Time (NO) | 1.4 ms typical - enables fast response in pulse-dial and ground-start telecom applications |
| Off-State Leakage (NO) | 0.02 nA typical - preserves high-impedance signal integrity in instrumentation front-ends |
| Ambient Operating Range | −40 °C to +85 °C - validated for deployment in uncontrolled industrial enclosures and telecom central office environments |
Pinout & Package
DIP-8 through-hole package with 7.62 mm lead pitch and 9.65 mm × 8.08 mm body dimensions; RoHS-compliant, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode | Optical input interface; requires 1.26 V typical forward voltage at 10 mA drive |
| 3, 4 | Form A Output (NO) | Normally open switch terminals; S1 = source, S1′ = drain for load connection |
| 5, 6 | Form B Output (NC) | Normally closed switch terminals; S2 = source, S2′ = drain; conducts when LED is off |
| 7, 8 | Common Reference | Shared substrate node for both output MOSFETs; must be tied to system ground or floating reference |
Key Features
| Feature | Design Value |
|---|---|
| Current limit protection | 360 mA typical trip threshold prevents latch-up during transient overloads without external fusing |
| Clean bounce-free switching | No mechanical contact arcing or chatter - eliminates EMI in sensitive measurement circuits |
| Low power consumption | 0.6 mA LED turn-on current enables direct microcontroller GPIO drive without buffer amplification |
| High surge capability | 400 mA single-shot peak current (Form B) sustains short-duration inrush from capacitive loads |
| SMD/DIP compatibility | DIP-8 footprint matches legacy board layouts while enabling drop-in replacement of electromechanical relays |
Applications
| Telecom On/Off-Hook Control | Industrial Ground Fault Protection |
|---|---|
Use Scenario: Managing line seizure and release in analog telephone interfaces. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated SPDT switching between tip/ring lines and ground reference. Use Value: Eliminates contact wear and acoustic noise of mechanical relays while maintaining UL-certified isolation for POTS compliance. |
Use Scenario: Detecting and interrupting earth leakage paths in PLC I/O modules. IC Role / Device Role / Timing Role: Isolated switch enabling safe disconnection of faulted sensor inputs under microcontroller supervision. Use Value: 3750 VRMS isolation and <1 μA off-state leakage ensure reliable fault detection without false triggering. |
| Instrumentation Signal Routing | Ring Delay Circuitry |
Use Scenario: Multiplexing high-impedance sensor outputs in data acquisition systems. IC Role / Device Role / Timing Role: Low-leakage, low-RON analog switch isolating input channels from shared ADC front-end. Use Value: 0.02 nA typical off-state leakage and 10 Ω RON preserve signal fidelity across 0–10 V ranges without calibration drift. |
Use Scenario: Introducing precise delay before applying ring voltage in PBX systems. IC Role / Device Role / Timing Role: Timing-controlled Form A switch gating ring generator output to subscriber line. Use Value: 1.4 ms typical turn-on time enables sub-millisecond delay resolution without external timing components. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar solid-state relay applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay LH1512BAC | SMD-8 package; same electrical specs but surface-mount footprint | Requires PCB rework for SMT assembly; not compatible with through-hole sockets or wave soldering | Select when automated pick-and-place and space-constrained layouts are prioritized over legacy DIP compatibility |
| IXYS CPC1976Y | Single-pole Form A only; 400 V load rating; 1.2 Ω RON; 5000 VRMS isolation | Lacks Form B/NC functionality and Form C configuration; higher voltage margin but no SPDT capability | Choose only for high-voltage NO-only switching where NC path is unnecessary and tighter RON is critical |
Compared with LH1512BAC and CPC1976Y, the LH1512BB uniquely provides dual-form (A+B) and configurable Form C operation in a DIP-8 package with verified 3750 VRMS isolation - making it the sole option for retrofitting electromechanical SPDT relays in legacy telecom and industrial control hardware.
Availability
LH1512BB is available at Aetrix Electronics and suitable for telecom infrastructure upgrades, industrial PLC I/O modules, and test equipment signal routing requiring stable component supply, long-term lifecycle support, and DIP-8 mechanical compatibility.
Supply support for LH1512BB 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, sensors, and optoelectronics with emphasis on reliability, precision, and safety-critical performance.
The LH1512BB belongs to Vishay's optocoupler and solid-state relay product line, engineered specifically for replacing electromechanical relays in telecom, instrumentation, and industrial control systems where isolation, longevity, and silent operation are mandatory.
FAQ
What is the maximum load voltage rating for the LH1512BB?
The LH1512BB supports up to 200 V DC or peak AC load voltage across its output terminals. This rating applies to both Form A (S1/S1′) and Form B (S2/S2′) configurations under continuous operation at ambient temperatures up to +85 °C, as confirmed in the Absolute Maximum Ratings table of Vishay Document 83812.
Does the LH1512BB support Form C (SPDT) operation?
Yes, the LH1512BB supports true Form C operation by using its independent Form A (normally open) and Form B (normally closed) outputs together with a common reference (pins 7 and 8). The device datasheet explicitly states it can be used "when used together, as a 1 form C relay", enabling single-pole double-throw switching without external wiring changes.
What is the typical on-resistance of the LH1512BB output switches?
The LH1512BB exhibits 10 Ω typical on-resistance (RON) for both Form A and Form B outputs at IL = 50 mA and Tamb = 25 °C. This value is specified in the Electrical Characteristics table and remains below 15 Ω across the full operating temperature range, ensuring predictable voltage drop in analog and power-switching applications.
Can the LH1512BB be driven directly from a microcontroller GPIO?
Yes, the LH1512BB can be driven directly from most microcontroller GPIO pins: its LED turn-on current is only 0.6 mA typical (max 2 mA), well within standard MCU output capability. A series resistor (e.g., 330 Ω with 3.3 V supply) suffices for reliable activation without buffering or level-shifting circuitry.
Is the LH1512BB certified for safety agency approvals?
Yes, the LH1512BB carries UL, VDE, CQC, and FIMKO safety certifications. These approvals validate its 3750 VRMS input-to-output isolation and construction for use in end-equipment requiring reinforced insulation, including telecom terminal equipment and industrial control panels compliant with IEC/EN 60950-1 and IEC/EN 62368-1.
LH1512BB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1512
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Through Hole
- Circuit:
- SPST-NO + SPST-NC (1 Form A and B)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.26VDC
- Voltage - Load:
- 0 V ~ 200 V
- Load Current:
- 200 mA
- On-State Resistance (Max):
- 10 Ohms
- Termination Style:
- PC Pin
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-DIP
- Approval Agency:
- CQC, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1512BB FAQ
1.How can I place an order for LH1512BB through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1512BB 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 LH1512BB reliable?
The price and inventory of LH1512BB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1512BB is usually 5 days.
3.What payment methods are accepted for LH1512BB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1512BB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1512BB?
LH1512BB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1512BB 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 LH1512BB?
For technical support, including LH1512BB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1512BB requirements.
6.How does Aetrix verify that LH1512BB is sourced from the original manufacturer or authorized distributors?
All LH1512BB 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 LH1512BB meets industry standards.
7.What is the process for return or replacement of LH1512BB?
All LH1512BB units undergo pre-shipment inspection (PSI). If there is an issue with LH1512BB, 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 LH1512BB part is unused and in its original packaging.
Return procedure for LH1512BB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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