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Vishay Semiconductor Opto Division LH1532FP
- Part No.:
- LH1532FP
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SOP (0.180", 4.57mm Width)
- Datasheet:
-
LH1532FP.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:2,884
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Product details
Overview
LH1532FP from Vishay Semiconductors is a dual 1 Form A (SPST) solid-state relay replacing electromechanical relays in telecom and industrial control systems. It integrates GaAlAs LED drivers, photodiode arrays, MOSFET switches, and current-limit protection. Key specs: 350 V load voltage, 120 mA continuous load current, 20 Ω typical on-resistance, 3000 VRMS isolation, and SOP-8 package.
For engineers reviewing the LH1532FP datasheet, LH1532FP pinout, LH1532FP application, or LH1532FP equivalent, key selection criteria include verified current-limit protection (170–250 mA), clean bounce-free switching, low power consumption, high surge capability, and UL/VDE-certified isolation for telecom line interface designs.
Technical Context
The LH1532FP uses an optically coupled architecture: a GaAlAs LED activates a monolithic die containing a photodiode array that drives integrated MOSFET switches. Each channel operates independently with dedicated current-limit circuitry protecting against lightning-induced surges on telephone lines.
It delivers clean SPST switching without contact bounce, supports ±350 V DC/peak AC load voltage, and maintains stable RON (20–25 Ω) and leakage (<200 nA at ±100 V) across –40 °C to +85 °C ambient. Isolation resistance exceeds 1012 Ω at 25 °C and 1011 Ω at 100 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage | 350 V DC or peak AC - supports telecom line interface and industrial AC/DC load switching without external snubbers |
| Continuous Load Current | 120 mA per channel - sufficient for triac predriving, analog multiplexing, and transducer driver applications |
| On-Resistance | 20 Ω typical - minimizes I²R heating and voltage drop in low-power signal path switching |
| Isolation Test Voltage | 3000 VRMS - certified to UL1577 and DIN EN 60747-5-5 for reinforced insulation in safety-critical systems |
| Current Limit Threshold | 170–250 mA - internal protection prevents latch-up or thermal runaway during transient overloads |
| Turn-on/Off Time | 1.1–2.5 ms / 0.06–2.5 ms - enables precise timing control in automatic tuning and ground-start signaling |
| Off-State Leakage | ≤200 nA at ±100 V - ensures high signal integrity in flying capacitor and instrumentation circuits |
Pinout & Package
Package: SOP-8 (7 mm body width), surface-mount flat pak with gull-wing leads; RoHS-compliant, moisture sensitivity level 3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode (Channel 1) | Optical input for first SSR channel; requires ≥1.2 mA IFon to activate switch |
| 3, 4 | Switch Source / Drain (Channel 1) | Load terminals for Channel 1; S1 (pin 3) = source, S1′ (pin 4) = drain |
| 5, 6 | LED Anode / Cathode (Channel 2) | Independent optical input for second SSR channel; electrically isolated from Channel 1 |
| 7, 8 | Switch Source / Drain (Channel 2) | Load terminals for Channel 2; S2 (pin 7) = source, S2′ (pin 8) = drain |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SPST channels | Enables compact two-channel switching in space-constrained telecom modules without cross-talk or shared failure modes |
| Integrated current-limit protection | Prevents destructive overcurrent events during lightning surges or shorted loads without external fusing |
| Bounce-free switching | Eliminates mechanical contact arcing and EMI in analog multiplexing and automatic balancing circuits |
| High isolation resistance (≥10¹² Ω) | Maintains signal integrity in high-impedance instrumentation paths and floating ground applications |
| Low 55 pF output capacitance | Minimizes signal distortion and crosstalk in high-frequency analog switching up to 100 kHz |
Applications
| On/Off Hook Control | Triac Predriver |
|---|---|
|
Use Scenario: Managing subscriber line state in analog telephone interfaces and VoIP gateways. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, bounce-free hook-state switching. Use Value: Eliminates mechanical wear and EMI from EM relays while supporting 350 V line voltage tolerance and lightning surge resilience. |
Use Scenario: Driving gate of main triac in industrial AC load controllers and motor starters. IC Role / Device Role / Timing Role: Low-power, isolated switch enabling microcontroller-level logic to safely trigger high-voltage AC switching. Use Value: 120 mA load current and 20 Ω RON ensure reliable triac gate charging without external buffer stages. |
| Ring Relay | Analog Multiplexing |
|
Use Scenario: Delivering 20–100 VAC ring signal to telephone handsets in PBX and central office equipment. IC Role / Device Role / Timing Role: High-voltage SPST switch isolating ring generator circuitry from subscriber line electronics. Use Value: 350 V breakdown voltage and 3000 VRMS isolation prevent coupling of ring voltage into control logic. |
Use Scenario: Routing sensor signals or reference voltages in data acquisition systems and test equipment. IC Role / Device Role / Timing Role: Low-capacitance (55 pF), low-leakage (<200 nA) analog switch for precision signal path selection. Use Value: Minimal charge injection and signal distortion preserve accuracy in 12-bit+ ADC front-ends and flying capacitor topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar solid-state relay applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AQW210S | Single-channel, same RON (20 Ω), identical 350 V/120 mA rating, but lacks dual-channel integration | Requires two devices and additional PCB area for dual-function designs; no current-limit circuitry | Select when single-channel isolation suffices and board space allows discrete placement |
| PVG612 | Higher 600 V load voltage, 100 mA current, 35 Ω RON, dual-channel, but no integrated current-limit protection | Better suited for higher-voltage industrial AC mains switching; less robust against telecom surge transients | Prefer for 400–600 V AC applications where surge immunity is managed externally |
Compared with AQW210S and PVG612, the LH1532FP uniquely combines dual-channel integration, built-in current-limit protection, and telecom-grade surge resilience-enabling smaller footprint, reduced BOM count, and simplified system-level surge compliance in telephone line interface designs.
Availability
LH1532FP is available at Aetrix Electronics and suitable for telecom switching, industrial control output modules, and instrumentation requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for LH1532FP 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 LH1532FP belongs to Vishay's optocoupler-based solid-state relay product line, engineered specifically for replacing electromechanical relays in telecom infrastructure, industrial automation, and precision analog signal routing where isolation, longevity, and surge immunity are critical.
FAQ
What is the maximum load voltage the LH1532FP can switch?
The LH1532FP supports a maximum DC or peak AC load voltage of 350 V per channel, as specified in its absolute maximum ratings. This rating applies under standard operating conditions (Tamb = 25 °C) and is validated per UL1577 and DIN EN 60747-5-5. Derating is required above 85 °C ambient, and the device must not be subjected to repetitive overvoltage transients exceeding this limit without external clamping.
Does the LH1532FP require external current-limiting resistors on the LED side?
Yes - the LH1532FP requires an external series resistor on each LED input (pins 1–2 and 5–6) to limit forward current to ≤50 mA. Typical turn-on current is 1.2–3 mA, so a resistor value is selected based on supply voltage and desired LED drive strength. The internal current-limit circuit protects only the output MOSFETs, not the input LEDs.
Can the LH1532FP replace mechanical relays in telephone ring detection circuits?
Yes - the LH1532FP is explicitly designed for telecom applications including ring relay functions. Its 350 V load voltage rating, 3000 VRMS isolation, and surge-hardened construction make it suitable for delivering ring voltage (typically 20–100 VAC at 20 Hz) while maintaining galvanic separation between ringing circuitry and subscriber line electronics.
What is the meaning of "dual 1 Form A" in the LH1532FP description?
"Dual 1 Form A" means the LH1532FP contains two independent SPST (single-pole, single-throw) normally-open switches - each with one input pair (LED anode/cathode) and one output pair (source/drain). There is no electrical or functional interdependence between the two channels, enabling fully isolated dual switching in one SOP-8 package.
How does the current-limit protection in the LH1532FP operate?
The LH1532FP incorporates internal current-limit circuitry that activates when load current exceeds 170–250 mA (typical 210 mA) per channel. It dynamically limits conduction to protect the MOSFET output stage from thermal damage during short-circuit or overload events - without requiring external fuses or sense resistors. Recovery is automatic once the overload condition clears.
LH1532FP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1532
- Packaging:
- Tube
- Product Status:
- Obsolete
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A) x 2
- Output Type:
- AC, DC
- Voltage - Input:
- 1.22VDC
- Voltage - Load:
- 0 V ~ 350 V
- Load Current:
- 120 mA
- On-State Resistance (Max):
- 20 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOP
- Approval Agency:
- CQC, cUL, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1532FP FAQ
1.How can I place an order for LH1532FP through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1532FP 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 LH1532FP reliable?
The price and inventory of LH1532FP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1532FP is usually 5 days.
3.What payment methods are accepted for LH1532FP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1532FP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1532FP?
LH1532FP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1532FP 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 LH1532FP?
For technical support, including LH1532FP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1532FP requirements.
6.How does Aetrix verify that LH1532FP is sourced from the original manufacturer or authorized distributors?
All LH1532FP 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 LH1532FP meets industry standards.
7.What is the process for return or replacement of LH1532FP?
All LH1532FP units undergo pre-shipment inspection (PSI). If there is an issue with LH1532FP, 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 LH1532FP part is unused and in its original packaging.
Return procedure for LH1532FP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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