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Vishay Semiconductor Opto Division LH1502BAC
- Part No.:
- LH1502BAC
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1502BAC.pdf
- Description:
- RELAY SPST-NO/NC 150MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:639
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Product details
Overview
LH1502BAC from Vishay Semiconductors is a dual 1 Form A/B, C solid-state relay (SSR) with optically isolated MOSFET outputs, designed for telecom and industrial switching. It features 350 V load voltage, 150 mA continuous load current, 20 Ω typical on-resistance, 3750 VRMS input-to-output isolation, and SMD-8 package for surface-mount reliability in space-constrained systems.
For engineers reviewing the LH1502BAC datasheet, LH1502BAC pinout, LH1502BAC application, or LH1502BAC equivalent, key selection criteria include form-A/B/C configuration flexibility, current-limit protection, bounce-free switching, and UL/VDE agency approvals for safety-critical signal routing.
Technical Context
The LH1502BAC integrates two independent optically coupled channels: one normally open (Form A) and one normally closed (Form B), configurable together as a single-pole double-throw (Form C) relay. Each channel uses an infrared LED input driving a photodiode array that controls matched MOSFET switches with integrated current-limit circuitry.
Its hybrid multi-chip construction enables high-voltage isolation (3750 VRMS) and clean switching without mechanical contact wear. The device operates across -40 °C to +85 °C ambient and supports lead-free reflow soldering per J-STD-020, with moisture sensitivity level 1 and unlimited floor life under controlled humidity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage | 350 V DC or peak AC - supports telecom line interface and industrial control bus voltages without external clamping |
| Continuous Load Current | 150 mA - sufficient for driving telecom relays, small solenoids, and logic-level analog switches |
| On-Resistance (TYP) | 20 Ω - ensures low conduction loss and minimal self-heating at rated load |
| Isolation Voltage | 3750 VRMS - meets UL, VDE, CQC, and FIMKO safety requirements for reinforced insulation |
| Switching Speed (TON/T_OFF) | 0.2–6 ms turn-on / ≤3 ms turn-off - enables precise timing control in pulse-based telecom signaling |
| Current Limit Threshold | 270–380 mA - protects output MOSFETs during transient overloads without external components |
| Off-State Leakage (NO) | <1000 nA at ±100 V - maintains high impedance integrity in high-impedance sensor or metering circuits |
Pinout & Package
SMD-8 package (JEDEC MS-012AC variant), 9.65 mm × 7.62 mm footprint, 1.78 mm max height, gull-wing leads, RoHS-compliant, tape-and-reel compatible (TR suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode (Channel 1) | Optical input for Form A (NO) switch; requires 0.6–2 mA IF to activate |
| 3, 4 | Output Source / Drain (S1 / S1′) | Form A (NO) output terminals; S1 = source, S1′ = drain; 350 V/150 mA rating |
| 5, 6 | LED Anode / Cathode (Channel 2) | Optical input for Form B (NC) switch; requires 0.2–2 mA IF to deactivate |
| 7, 8 | Output Source / Drain (S2 / S2′) | Form B (NC) output terminals; S2 = source, S2′ = drain; same voltage/current ratings as S1/S1′ |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Eliminates contact chatter in telecom dial pulse and ring delay applications, ensuring reliable waveform generation |
| Integrated current limit protection | Self-limiting output stage prevents latch-up or thermal runaway during short-circuit transients |
| High surge capability | Withstands 350 mA peak single-shot current (Form B) for 100 ms, supporting lightning-induced surge events |
| Low power consumption | Typical 0.6 mA LED drive for NO activation reduces system standby power in battery-backed systems |
| UL/VDE certified isolation | Validated 3750 VRMS withstand voltage enables use in Class I and II mains-connected telecom equipment |
Applications
| Telecom On/Off-Hook Control | Industrial Ground Fault Protection |
|---|---|
Use Scenario: Managing line seizure and release in analog telephone interfaces and VoIP gateways. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, polarity-insensitive switching of tip/ring lines. Use Value: Enables fast, repeatable hook-state transitions with no mechanical wear, meeting GR-909 and ITU-T Q.23 timing compliance. | Use Scenario: Detecting and isolating ground faults in programmable logic controller (PLC) I/O modules. IC Role / Device Role / Timing Role: Isolated output switch interrupting fault current path upon detection by upstream sensing circuitry. Use Value: Provides 350 V standoff and 150 mA interruption capacity while maintaining >5000 GΩ off-state resistance for leakage monitoring. |
| Instrumentation Signal Routing | Ring Delay Circuitry |
Use Scenario: Multiplexing sensor inputs or calibration references in precision test equipment. IC Role / Device Role / Timing Role: Low-leakage, low-RON analog switch enabling <1000 nA off-state error in µV-level measurements. Use Value: Maintains signal integrity with 50 pF output capacitance and sub-µA leakage, avoiding measurement drift in 6½-digit DMMs. | Use Scenario: Introducing controlled time delay between ring signal detection and line connection in PBX systems. IC Role / Device Role / Timing Role: Precision timing element using predictable 0.2–6 ms turn-on to generate deterministic ring cadence intervals. Use Value: Delivers consistent 20–60 ms delay windows without external RC networks, reducing BOM count and layout sensitivity. |
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 LH1502BB | DIP-8 through-hole package; identical electrical specs and pinout mapping but different mounting method | Preferred for prototyping, legacy board repair, or wave-soldered industrial controllers where SMT is impractical | Select LH1502BB when manual assembly, reworkability, or compatibility with existing DIP footprints is required |
| Toshiba TLP3558A | Single-channel Form A SSR; 400 V load voltage, 120 mA current, 0.25 Ω RON, but lacks Form B/NC functionality | Used only where unidirectional switching suffices; cannot replicate LH1502BAC's Form C or ground-fault latching behavior | Choose TLP3558A only for cost-sensitive, single-pole NO applications with lower RON priority and no NC requirement |
Compared with LH1502BB and TLP3558A, the LH1502BAC uniquely delivers dual-form (A+B/C), SMD-8 packaging, and integrated current limiting in a single component-enabling compact, safety-certified, and functionally complete relay replacement without external protection or layout redesign.
Availability
LH1502BAC is available at Aetrix Electronics and suitable for telecom switching, industrial control, instrumentation, and ground fault protection requiring stable component supply and long-term lifecycle support.
Supply support for LH1502BAC 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, precision, and safety certification.
The LH1502BAC belongs to Vishay's optocoupler and solid-state relay product line, engineered specifically for replacing electromechanical relays in telecom infrastructure, industrial automation, and test equipment where longevity, noise immunity, and regulatory compliance are critical.
FAQ
What is the maximum ambient temperature rating for the LH1502BAC?
The LH1502BAC is rated for continuous operation from -40 °C to +85 °C ambient temperature. Its maximum load current derates linearly above 25 °C, reaching 120 mA at +60 °C and 90 mA at +85 °C per the datasheet Fig. 1 and Fig. 2. Thermal design must account for internal power dissipation (up to 600 mW) and PCB copper area to maintain safe junction temperatures.
Does the LH1502BAC support Form C (SPDT) operation?
Yes, the LH1502BAC supports true 1 Form C operation by using its independent Form A (S1/S1′) and Form B (S2/S2′) outputs together. When the Form A channel is activated and Form B is deactivated, the common terminal behaves as a single-pole double-throw switch. This configuration is explicitly validated in the device description and supported by the pin labeling (S1, S1′, S2, S2′) and functional truth table in the Vishay datasheet.
What is the minimum LED forward current required to reliably actuate the LH1502BAC's Form A (NO) output?
The LH1502BAC Form A output turns on with a typical LED forward current of 0.6 mA and a maximum of 2 mA at 25 °C (IFon, NO). For robust operation across temperature and unit variation, Vishay recommends designing for ≥1.0 mA drive. The device remains fully specified down to 0.4 mA, but margin below 0.6 mA may reduce speed or increase RON variability.
How does the current limit protection function in the LH1502BAC?
The LH1502BAC incorporates internal current-limit circuitry that activates when load current exceeds 270–380 mA (ILMT), clamping the output to prevent damage. This feature operates independently per channel and does not require external components. During overload, the device sustains the current limit without latch-up and recovers automatically once the fault clears, preserving MOSFET integrity in surge-prone telecom environments.
Is the LH1502BAC RoHS-compliant and halogen-free?
Yes, the LH1502BAC is RoHS-compliant and halogen-free per Vishay's material categorization standard (document 99912). It meets JEDEC J-STD-020 lead-free reflow requirements, has MSL Level 1 rating, and carries no restricted substances above threshold limits. Full compliance documentation, including test reports and declarations, is available via Vishay's official product page and technical support portal.
LH1502BAC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1502
- Packaging:
- Tube
- 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 ~ 350 V
- Load Current:
- 150 mA
- On-State Resistance (Max):
- 20 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SMD
- Approval Agency:
- CQC, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1502BAC FAQ
1.How can I place an order for LH1502BAC through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1502BAC 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 LH1502BAC reliable?
The price and inventory of LH1502BAC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1502BAC is usually 5 days.
3.What payment methods are accepted for LH1502BAC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1502BAC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1502BAC?
LH1502BAC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1502BAC 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 LH1502BAC?
For technical support, including LH1502BAC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1502BAC requirements.
6.How does Aetrix verify that LH1502BAC is sourced from the original manufacturer or authorized distributors?
All LH1502BAC 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 LH1502BAC meets industry standards.
7.What is the process for return or replacement of LH1502BAC?
All LH1502BAC units undergo pre-shipment inspection (PSI). If there is an issue with LH1502BAC, 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 LH1502BAC part is unused and in its original packaging.
Return procedure for LH1502BAC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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