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Vishay Semiconductor Opto Division LH1512BACTR
- Part No.:
- LH1512BACTR
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1512BACTR.pdf
- Description:
- RELAY SPST-NO/NC 200MA 0-200V
- Quantity:
- Payment:
- Shipping:
Inventory:1,508
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Product details
Overview
LH1512BACTR from Vishay Semiconductors is a dual 1 Form A/B, C solid-state relay hybrid device integrating infrared LED actuation, photodiode array sensing, and MOSFET output switches. It delivers 200 V load voltage handling, 200 mA continuous load current (Form C), and 10 Ω typical on-resistance - enabling clean, bounce-free telecom switching in space-constrained SMD-8 packages.
For engineers reviewing the LH1512BACTR datasheet, LH1512BACTR pinout, LH1512BACTR application, or LH1512BACTR equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, telecom- and industrial-grade application mappings, and two confirmed alternative parts with documented functional and packaging differences.
Technical Context
The LH1512BACTR implements optically isolated control via an integrated infrared LED driving a photodiode array that triggers complementary MOSFET output stages - one normally open (S1/S1′) and one normally closed (S2/S2′). Its multichip hybrid construction enables independent Form A and Form B operation or combined Form C switching without mechanical contacts.
It features built-in current limit protection (360 mA typical), 3750 VRMS input-to-output isolation, and operates across –40 °C to +85 °C ambient. The device supports both AC and DC loads up to 200 V, with turn-on/turn-off times under 3 ms and leakage currents below 1 μA in off-state configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage | 200 V DC or peak AC - supports standard telecom line voltages and industrial control rails without external snubbing. |
| Continuous Load Current | 200 mA (Form C) - sufficient for on/off hook signaling, ring delay, and ground start circuits in PBX and VoIP gateways. |
| On-Resistance | 10 Ω typical - minimizes I²R heating and voltage drop in low-power analog/digital signal path switching. |
| Isolation Voltage | 3750 VRMS - meets UL, VDE, CQC, and FIMKO safety requirements for reinforced insulation in telecom and industrial equipment. |
| Turn-On Time | 1.4 ms typical (NO), 1.2 ms typical (NC) - enables precise timing control in pulse-dial and ground-fault detection applications. |
| Off-State Leakage | <1 μA at ±200 V - ensures reliable high-impedance blocking in instrumentation and sensor interface circuits. |
| Package | SMD-8 - surface-mount footprint compatible with automated assembly and reflow profiles per J-STD-020. |
Pinout & Package
SMD-8 package with gull-wing leads; 7.62 mm lead pitch; RoHS-compliant, lead-free finish; moisture sensitivity level 1; ESD rated HBM Class 2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode | Optical input control path - requires 0.6–2 mA forward current to activate NO switch; 0.2–2 mA to deactivate NC switch. |
| 5, 6 | Form A Output (S1 / S1′) | Normally open switch terminals - conduct when LED is energized; 10 Ω RON enables low-loss signal routing. |
| 7, 8 | Form B Output (S2 / S2′) | Normally closed switch terminals - open when LED is energized; used for fail-safe or default-closed paths. |
| 3, 4 | Common / Ground Reference | Shared source node for internal MOSFETs - must be connected to system ground or common reference plane. |
Key Features
| Feature | Design Value |
|---|---|
| Current limit protection | 360 mA typical trip threshold prevents latch-up or thermal runaway during transient overloads in telecom line interfaces. |
| Clean bounce-free switching | No contact arcing or mechanical wear - eliminates EMI spikes and timing jitter critical in dial-pulse and ring-delay circuits. |
| High surge capability | Withstands 400 mA single-shot peak current (Form B) - handles lightning-induced transients and inrush in industrial controls. |
| Low power consumption | 0.6 mA typical LED turn-on current - reduces drive circuit power and heat in battery-backed or energy-efficient systems. |
| UL/VDE/CQC/FIMKO certified | Reinforced isolation compliance - simplifies safety certification for telecom infrastructure and medical auxiliary equipment. |
Applications
| Telecom On/Off Hook Control | Ground Start Signaling |
|---|---|
|
Use Scenario: Managing loop closure/opening between telephone exchange and subscriber line in analog PBX and VoIP gateway designs. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, bounce-free switching of 48 V DC loop current. Use Value: Eliminates mechanical relay wear and contact oxidation, ensuring >1 million operations with stable RON over temperature. |
Use Scenario: Detecting and initiating call setup by grounding the tip/ring pair before applying battery voltage in legacy central office systems. IC Role / Device Role / Timing Role: Fail-safe Form B switch (S2/S2′) that opens only upon LED activation - maintains default-grounded state until commanded. Use Value: Prevents false starts and ensures protocol compliance with ANSI T1.401 and ITU-T Q.551 standards. |
| Ring Delay Circuitry | Instrumentation Signal Routing |
|
Use Scenario: Introducing programmable delay between ring signal detection and audio path activation in answering machines and fax modems. IC Role / Device Role / Timing Role: Dual-form relay enabling sequential switching: Form A closes after delay to enable audio; Form B opens to isolate ring detector. Use Value: Achieves sub-millisecond timing accuracy and zero cross-talk between ring and voice paths due to 3 pF input-output capacitance. |
Use Scenario: Multiplexing low-level sensor signals (e.g., thermocouple, strain gauge) into shared ADC channels while maintaining channel-to-channel isolation. IC Role / Device Role / Timing Role: High-impedance Form A switch (ROFF > 0.35 GΩ) routing microvolt-level signals without loading or leakage-induced offset. Use Value: Preserves signal integrity with <1 nA off-state leakage - critical for 16-bit+ precision measurement systems. |
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 | Identical die and functionality; differs only in packaging - supplied in tubes instead of tape-and-reel. | No change in circuit design or layout; suitable for low-volume prototyping or manual assembly where reel feeding is unavailable. | Select LH1512BAC for bench validation or small-batch builds; LH1512BACTR is optimized for SMT production lines. |
| IXYS CPC1976Y | Single-pole Form A only; 150 V load rating; 120 mA max current; SOIC-8 package with different pinout (no Form B outputs). | Cannot replace LH1512BACTR in Form C or ground-start applications; limited to simpler on/off switching with lower voltage/current headroom. | Choose CPC1976Y only when Form B functionality and 200 V/200 mA capability are not required - verify pin compatibility before PCB reuse. |
Compared with LH1512BACTR, LH1512BAC offers identical electrical performance in tube packaging for flexibility in early-stage development, while CPC1976Y provides a cost-optimized single-form alternative with reduced voltage/current ratings and no NC switching capability - limiting its use to non-critical, low-energy signal paths.
Availability
LH1512BACTR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial control panels, and instrumentation systems requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for LH1512BACTR 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 and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.
The LH1512BACTR belongs to Vishay's LH15xx series of hybrid solid-state relays, engineered specifically for telecom switching, industrial automation, and test equipment where mechanical relay limitations - wear, bounce, EMI, and lifetime - must be eliminated.
FAQ
What is the maximum load voltage rating for LH1512BACTR?
The LH1512BACTR supports a maximum DC or peak AC load voltage of 200 V, as specified in its absolute maximum ratings table. This rating applies across the full operating temperature range (–40 °C to +85 °C) and is validated for both Form A and Form B configurations. Exceeding this voltage risks breakdown between output pins, especially under transient conditions.
Does LH1512BACTR support Form C (SPDT) operation?
Yes, the LH1512BACTR supports true Form C operation by using its independent Form A (S1/S1′) and Form B (S2/S2′) outputs together - enabling single-pole double-throw switching with break-before-make behavior. This is explicitly described in the device's datasheet as a core function, distinct from simple dual-relay operation.
What is the typical on-resistance of LH1512BACTR and how does it affect thermal performance?
The LH1512BACTR has a typical on-resistance of 10 Ω, measured at IL = 50 mA. At its maximum continuous load current of 200 mA, this yields 400 mW of I²R power dissipation - within its 600 mW continuous output power rating. Thermal derating begins above +60 °C ambient, per Figure 1 in the datasheet.
Can LH1512BACTR be used in AC load applications?
Yes, the LH1512BACTR is rated for 200 V peak AC load voltage and exhibits symmetrical blocking in both polarities. Its MOSFET-based output stage supports zero-crossing–free switching, making it suitable for AC-coupled telecom signals, AC-powered industrial sensors, and non-sinusoidal waveforms - provided peak voltage remains ≤200 V.
What is the isolation test voltage for LH1512BACTR and which safety standards does it meet?
The LH1512BACTR is tested to 3750 VRMS input-to-output isolation for 1 second, meeting UL 1577, VDE EN 60747-5-5, CQC GB/T 17043, and FIMKO standards. This reinforced insulation rating allows use in mains-connected telecom equipment and industrial controllers without additional barrier requirements.
LH1512BACTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1512
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- 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:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SMD
- Approval Agency:
- CQC, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1512BACTR FAQ
1.How can I place an order for LH1512BACTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1512BACTR 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 LH1512BACTR reliable?
The price and inventory of LH1512BACTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1512BACTR is usually 5 days.
3.What payment methods are accepted for LH1512BACTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1512BACTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1512BACTR?
LH1512BACTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1512BACTR 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 LH1512BACTR?
For technical support, including LH1512BACTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1512BACTR requirements.
6.How does Aetrix verify that LH1512BACTR is sourced from the original manufacturer or authorized distributors?
All LH1512BACTR 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 LH1512BACTR meets industry standards.
7.What is the process for return or replacement of LH1512BACTR?
All LH1512BACTR units undergo pre-shipment inspection (PSI). If there is an issue with LH1512BACTR, 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 LH1512BACTR part is unused and in its original packaging.
Return procedure for LH1512BACTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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