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Vishay Semiconductor Opto Division LH1525ACD
- Part No.:
- LH1525ACD
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-PowerSOIC (0.220", 5.59mm Width)
- Datasheet:
-
LH1525ACD.pdf
- Description:
- SSR RELAY SPST-NO 270MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:2,642
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Product details
Overview
LH1525ACD from Vishay Semiconductors is a surface-mountable 1 Form A solid-state relay (SPST NO) in an 8-pin SOP package, featuring 400 V load voltage rating, 110 mA continuous dc load current, and 2500 VRMS input/output isolation. It uses a GaAlAs LED actuator and monolithic BCDMOS output die with integrated current-limit protection, enabling clean switching in battery-powered telecom line interface applications.
For engineers reviewing the LH1525ACD datasheet, LH1525ACD pinout, LH1525ACD application, or LH1525ACD equivalent, key selection criteria include ON-resistance linearity, low LED turn-on current (0.3–0.5 mA), thermal foldback behavior under overload, and compliance with UL1577, CSA, and RoHS.
Technical Context
The LH1525ACD integrates a photodiode array-driven MOSFET switch fabricated in high-voltage dielectrically isolated BCDMOS technology. Its internal current-limit circuitry clamps overload at 170–270 mA with negative temperature coefficient behavior, enabling FCC 68.302 surge compliance when external overvoltage protection is applied.
Switching is controlled by LED forward current (IFon ≤ 0.5 mA typical), producing photovoltaic drive for the output stage. Turn-on/turn-off times range from 0.5–1.0 ms and 0.2–1.5 ms respectively, depending on IF and IL, with ON-resistance of 17–36 Ω at ±50 mA load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage | 400 V DC or peak AC - supports telephone line interface and ring relay operation without external snubbing |
| Continuous Load Current | 110 mA - sufficient for PCMCIA Type 2 card switching and programmable controller I/O |
| Input/Output Isolation | 2500 VRMS - meets UL1577 and CSA safety requirements for telecom and instrumentation |
| ON-Resistance | 17–36 Ω - linear near origin up to knee current (IK), minimizing conduction loss in low-power loads |
| LED Turn-on Current | 0.3–0.5 mA typical - enables direct drive from low-power microcontrollers or battery-operated logic |
| Current Limit Threshold | 170–270 mA - provides self-protection during transient surges while maintaining FCC 68.302 compliance |
| Operating Temperature | −40 °C to +85 °C - validated for industrial embedded and telecom equipment environments |
Pinout & Package
Package: 8-pin Small Outline Package (SOP), lead-free (e3), RoHS-compliant. Pins 6 and 7 form a thermal tab requiring PCB land pattern attachment for thermal management.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode | Optical input control path; requires ≥0.3 mA forward current to initiate switching |
| 5, 8 | Load Terminal (±) | SPST NO output switch terminals; rated for 400 V, 110 mA continuous, 17–36 Ω RON |
| 6, 7 | Thermal Tab (NC electrically) | Non-electrical thermal pad; must be soldered to PCB copper area to maintain RthJA = 200 °C/W |
| 3, 4 | No Connect | Internally unconnected; no routing or bonding required |
Key Features
| Feature | Design Value |
|---|---|
| High-speed switching | Turn-on time as low as 0.5 ms at 5 mA LED drive - reduces latency in real-time hook/ring detection |
| Current-limit protection | Self-regulating clamp at 170–270 mA with thermal foldback - eliminates need for external fusing in telecom line interfaces |
| Low-power LED drive | 0.3 mA typical turn-on current - extends battery life in portable switching applications |
| Bounce-free operation | No mechanical contact arcing or chatter - ensures signal integrity in ground-start and on/off-hook timing |
| Monolithic receptor architecture | Single-die integration of photodiode array, control logic, and MOSFETs - improves reliability vs. hybrid SSRs |
Applications
| Telephone Line Interface | PCMCIA Type 2 Card |
|---|---|
Use Scenario: On/off hook detection and ring signal routing in analog telephone systems. IC Role / Device Role / Timing Role: SPST NO solid-state relay isolating subscriber line from controller logic. Use Value: 2500 VRMS isolation prevents ground loop interference; 400 V rating handles ring voltage transients. | Use Scenario: Power switching for peripheral insertion/removal in laptop PCMCIA slots. IC Role / Device Role / Timing Role: Low-power load switch enabling hot-swap control with minimal system current draw. Use Value: 0.3 mA LED turn-on current allows direct GPIO drive; 110 mA rating supports typical card power rails. |
| Battery-Powered Switching | Programmable Controllers |
Use Scenario: Remote sensor node power gating in energy-constrained IoT deployments. IC Role / Device Role / Timing Role: Isolated load switch activated by ultra-low-current microcontroller outputs. Use Value: 550 mW total power dissipation and 200 °C/W thermal resistance enable passive cooling in sealed enclosures. | Use Scenario: Industrial I/O module output stage for driving solenoids or indicator lamps. IC Role / Device Role / Timing Role: Reinforced isolation barrier between PLC logic and field-side loads. Use Value: UL1577 and CSA certification validates use in safety-critical control loops without additional optocoupler staging. |
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 LH1525CTR | Tape-and-reel packaging only; identical electrical specs and pinout to LH1525ACD | No functional difference; selected for automated SMT assembly | Choose LH1525CTR for volume production with pick-and-place equipment |
| Panasonic AQV252 | Higher 600 V load voltage; 100 mA continuous current; 2500 VRMS isolation; different SOP-4 footprint | Not pin-compatible; requires PCB redesign but offers higher voltage margin for legacy POTS lines | Select AQV252 only when 600 V rating is mandatory and layout revision is acceptable |
Compared with LH1525ACD, LH1525CTR offers identical performance in tape-and-reel format for SMT scalability, while AQV252 provides higher voltage headroom at the cost of non-interchangeable packaging and reduced current rating - both require validation against specific isolation, thermal, and timing requirements.
Availability
LH1525ACD is available at Aetrix Electronics and suitable for telephone line interface, PCMCIA card switching, and battery-powered instrumentation requiring stable component supply across extended product lifecycles.
Supply support for LH1525ACD 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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability, industry-qualified devices for automotive, industrial, and telecom markets.
The LH1525ACD belongs to Vishay's optically isolated solid-state relay product line, designed specifically for low-power, high-isolation switching in space-constrained telecom and portable instrumentation applications.
FAQ
What is the minimum LED forward current required to activate the LH1525ACD?
The LH1525ACD has a typical LED forward current for switch turn-on of 0.3–0.5 mA at 25 °C. This low activation threshold enables direct drive from low-power microcontrollers or battery-operated logic circuits without external amplification. The LH1525ACD maintains reliable operation across its full −40 °C to +85 °C ambient range, though higher IF may be needed at elevated temperatures or load currents.
Does the LH1525ACD provide built-in overcurrent protection?
Yes, the LH1525ACD incorporates internal current-limit circuitry that clamps output current at 170–270 mA, with a negative temperature coefficient causing foldback under sustained overload. This feature satisfies FCC 68.302 surge requirements when used with appropriate external overvoltage protection. The LH1525ACD does not require external fuses or current-sense resistors for basic protection in telecom line interface applications.
What is the thermal management requirement for the LH1525ACD?
The LH1525ACD uses pins 6 and 7 as a thermal tab requiring soldering to a PCB copper land of equal or greater size to achieve the specified 200 °C/W junction-to-ambient thermal resistance. Running metal traces underneath the device must be avoided to preserve input-to-output isolation integrity. The LH1525ACD's thermal design enables operation at full 110 mA load current without forced air cooling in standard FR-4 layouts.
Is the LH1525ACD certified for safety standards?
Yes, the LH1525ACD is certified to UL1577 (File E52744, System Code S), CSA (Certification 093751), and FIMKO. It complies with RoHS 2002/95/EC and WEEE 2002/96/EC directives. These certifications validate its suitability for safety-isolated applications such as telephone line interface and programmable controller I/O where regulatory approval is mandatory.
Can the LH1525ACD replace mechanical relays in PCMCIA Type 2 applications?
Yes, the LH1525ACD is explicitly recommended for PCMCIA Type 2 card switching due to its bounce-free operation, low power consumption, and surface-mount SOP-8 footprint. Unlike mechanical relays, the LH1525ACD eliminates contact wear, electromagnetic interference, and acoustic noise. Its 400 V load rating and 110 mA current capacity match typical PCMCIA power rail requirements, making the LH1525ACD a drop-in replacement in new designs with verified thermal layout.
LH1525ACD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1525
- Packaging:
- Tube
- Product Status:
- Obsolete
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.15VDC
- Voltage - Load:
- 0 V ~ 400 V
- Load Current:
- 270 mA
- On-State Resistance (Max):
- 36 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOP
- Approval Agency:
- cUL, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1525ACD FAQ
1.How can I place an order for LH1525ACD through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1525ACD 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 LH1525ACD reliable?
The price and inventory of LH1525ACD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1525ACD is usually 5 days.
3.What payment methods are accepted for LH1525ACD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1525ACD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1525ACD?
LH1525ACD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1525ACD 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 LH1525ACD?
For technical support, including LH1525ACD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1525ACD requirements.
6.How does Aetrix verify that LH1525ACD is sourced from the original manufacturer or authorized distributors?
All LH1525ACD 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 LH1525ACD meets industry standards.
7.What is the process for return or replacement of LH1525ACD?
All LH1525ACD units undergo pre-shipment inspection (PSI). If there is an issue with LH1525ACD, 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 LH1525ACD part is unused and in its original packaging.
Return procedure for LH1525ACD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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