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Vishay Semiconductor Opto Division LH1525AT
- Part No.:
- LH1525AT
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-DIP (0.300", 7.62mm)
- Datasheet:
-
LH1525AT.pdf
- Description:
- SSR RELAY SPST-NO 250MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:868
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Product details
Overview
LH1525AT from Vishay Semiconductors is a 1-Form-A solid-state relay (SSR) with GaAlAs LED input and MOSFET output, rated for 400 V load voltage and 250 mA DC-only continuous load current. It provides optically isolated, bounce-free switching with 5300 VRMS isolation and surface-mount-compatible DIP-6 package. Ideal for low-power industrial control and battery-powered telecom switching.
For engineers reviewing the LH1525AT datasheet, LH1525AT pinout, LH1525AT application, or LH1525AT equivalent, this SSR delivers verified low-drive-current operation (≤0.9 mA turn-on), sub-millisecond switching (0.15 ms typical turn-on), and safety-certified insulation (UL/cUL/VDE/FIMKO) - critical for space-constrained, safety-compliant embedded systems.
Technical Context
The LH1525AT integrates a GaAlAs infrared LED coupled to dual-MOSFET output stage in a single DIP-6 package, enabling galvanic isolation between input and output circuits. Its DC-only configuration supports unidirectional load switching up to 400 V with on-resistance as low as 5 Ω (typ.) at 5 mA LED drive.
It operates across –40 °C to +85 °C ambient, with safety-rated insulation (VIORM = 890 Vpeak, VISO = 5300 VRMS) and creepage/clearance ≥7 mm. The device meets IEC 60747-5-5 for safe electrical insulation when used with appropriate protective circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage Rating | 400 V DC - supports high-voltage DC loads such as solenoids, PLC outputs, and telecom line cards without external snubbers. |
| DC Load Current | 250 mA continuous - sufficient for driving medium-power relays, indicators, and small actuators directly. |
| Input Drive Current | ≤0.9 mA max for turn-on - enables direct interface with ultra-low-power microcontrollers and battery-operated logic. |
| Isolation Voltage | 5300 VRMS (1 min) - satisfies reinforced insulation requirements for industrial and telecom safety standards (UL, cUL, VDE). |
| Turn-On Time | 0.15 ms typical at 5 mA drive - ensures fast response in real-time control loops and digital signal routing. |
| On-Resistance | 5–8.25 Ω (DC config) - minimizes conduction loss and self-heating under 250 mA load, supporting >700 mW safety power dissipation. |
| Package | DIP-6, 7.62 mm pitch - compatible with standard through-hole PCB assembly and legacy socketed designs. |
Pinout & Package
DIP-6 package with 7.62 mm lead pitch, 0.25 mm lead thickness, and 6.65 mm body width. RoHS-compliant, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED anode input | Connects to MCU GPIO or driver IC output; requires series resistor to limit IF ≤50 mA. |
| 2 (Cathode) | LED cathode input | Ground reference for input side; defines LED polarity and enables common-cathode drive schemes. |
| 3 (NC) | No connect | Internally unused; must remain unconnected to avoid parasitic coupling or latch-up risk. |
| 4 (Load +) | Output source terminal (DC only) | High-side switch node; connects to positive supply rail of DC load (e.g., +V of solenoid or lamp). |
| 5 (Load –) | Output sink terminal (DC only) | Low-side return path; connects to load ground or negative rail - completes DC current path. |
| 6 (Case / Shield) | Internal shield connection | Connected to internal isolation barrier shielding; recommended to tie to system earth or chassis ground for EMI suppression. |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Eliminates contact arcing and mechanical wear - essential for high-cycle-count applications like programmable logic controllers. |
| Low operating current (≤0.9 mA) | Reduces MCU I/O loading and extends battery life in portable instrumentation and remote sensors. |
| 5300 VRMS isolation | Enables safe interfacing between low-voltage control logic and hazardous AC/DC mains-connected loads. |
| Surface-mountable DIP-6 footprint | Supports both automated SMT placement (with adapter) and manual through-hole rework - simplifies prototyping and production flexibility. |
| DC-only output configuration | Optimizes MOSFET channel design for unidirectional conduction, achieving lower RON and higher reliability vs. AC/DC variants. |
Applications
| Telecom Line Switching | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Remote activation of POTS line test circuits or DSLAM port isolation in field-deployable test sets. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, low-leakage switching of 48 V DC telecom battery feeds. Use Value: Enables >1 million operations without degradation, unlike electromechanical relays, while drawing <1 µA off-state leakage at ±400 V. |
Use Scenario: Power gating of sensor front-ends and calibration references in handheld multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Low-drive-current SSR controlling power domains to extend battery runtime and reduce standby current. Use Value: Achieves 0.9 mA turn-on threshold - compatible with 1.8 V GPIOs and eliminates need for external level-shifting or buffer stages. |
| Industrial PLC Output Modules | Medical Instrument Isolation |
Use Scenario: Replacing mechanical relays in DIN-rail-mounted PLC output cards handling 24–48 V DC solenoid and valve drivers. IC Role / Device Role / Timing Role: Safety-certified SSR delivering reinforced insulation and fast (<0.2 ms) deterministic switching for motion control sequencing. Use Value: Meets UL 508 and IEC 61000-4-5 surge immunity requirements via 8000 Vpeak transient isolation voltage and ≥7 mm creepage. |
Use Scenario: Isolating patient-connected analog signal paths (e.g., ECG lead selection) from digital control logic in diagnostic devices. IC Role / Device Role / Timing Role: Optically isolated switch ensuring patient safety by breaking ground loops and preventing leakage currents >10 µA. Use Value: Complies with IEC 60601-1 3rd ed. via 5300 VRMS withstand voltage and CTI ≥175 (Group IIIa insulation). |
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 LH1525AAB | SMD-6 package (vs. DIP-6); identical electrical specs and safety ratings. | Requires reflow soldering and SMT layout; unsuitable for through-hole prototypes or legacy boards. | Select LH1525AAB for high-volume automated assembly where board space and thermal performance are prioritized. |
| IXYS CPC1976Y | Higher 600 V load rating; 1.2 mA max turn-on current; SOIC-6 package. | Supports wider input voltage range but lacks UL/VDE certification for end-equipment safety compliance. | Choose CPC1976Y only when higher voltage margin is required and agency approvals are handled externally. |
Compared with LH1525AAB and CPC1976Y, the LH1525AT offers drop-in compatibility with existing DIP-6 footprints, full safety certification out-of-box, and lowest drive current requirement - making it optimal for cost-sensitive, certified industrial and medical designs requiring zero layout change.
Availability
LH1525AT is available at Aetrix Electronics and suitable for industrial PLC output modules, battery-powered test equipment, and telecom line switching requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LH1525AT 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 management, and sensing solutions for industrial, automotive, and computing markets.
The LH1525AT belongs to Vishay's LH15xx family of solid-state relays, engineered specifically for replacing electromechanical relays in safety-critical, low-power, and high-cycle-count applications where reliability and regulatory compliance are mandatory.
FAQ
What is the maximum continuous load current rating for the LH1525AT?
The LH1525AT supports 250 mA continuous load current in DC-only configuration, validated per its absolute maximum ratings and electrical characteristics table. This rating applies at Tamb ≤ 85 °C with proper PCB copper area for thermal dissipation. Exceeding this current risks exceeding the 550 mW SSR output power dissipation limit and may trigger thermal shutdown or long-term reliability degradation. Always verify actual board-level thermal performance using Fig. 5 (Maximum Load Current vs. Ambient Temperature) from the official Vishay datasheet.
Does the LH1525AT support AC load switching?
No, the LH1525AT is explicitly specified as a DC-only output configuration in its datasheet - confirmed by separate "DC only configuration" pin diagram (Fig. 1), on-resistance test condition (IF = 5 mA, IL = 100 mA), and absence of AC/DC dual-mode parameters in its electrical characteristics. Attempting AC switching may cause catastrophic failure due to lack of reverse-blocking capability in its MOSFET output stage. For AC loads, use the LH1525AABTR or other AC/DC-rated variants from the same family.
What is the minimum LED forward current required to reliably turn on the LH1525AT?
The LH1525AT guarantees turn-on with ≤0.9 mA forward current (IFon) under test conditions of IL = 100 mA and t = 10 ms, per its Electrical Characteristics table. This value is a maximum specification - actual turn-on occurs at lower currents depending on temperature and load. Designers should target ≥1.5 mA to ensure margin across –40 °C to +85 °C ambient, referencing Fig. 8 (Normalized Forward Current for Switch Turn-On vs. Temperature) and applying the 1.2× derating factor shown at 85 °C.
Can the LH1525AT be used in medical equipment requiring IEC 60601-1 compliance?
Yes - the LH1525AT carries UL, cUL, VDE, and FIMKO safety certifications with 5300 VRMS isolation, ≥7 mm creepage/clearance, and CTI ≥175 (Group IIIa), satisfying key insulation requirements of IEC 60601-1 3rd edition for patient-connected devices. However, final system-level compliance depends on full implementation including protective circuits, enclosure design, and grounding - as explicitly noted in Section 7.4.3.8.2 of IEC 60747-5-5 and Vishay's disclaimer (Doc. #91000). Always validate the complete safety architecture with a certified test lab.
What is the function of Pin 3 (NC) on the LH1525AT?
Pin 3 on the LH1525AT is designated "No Connect" (NC) in the official Vishay datasheet (Document #83823, Fig. 1), meaning it has no internal electrical connection to any active circuitry. It must remain unconnected on the PCB - routing traces to or from Pin 3 may introduce parasitic capacitance, noise coupling, or unintended current paths that compromise isolation integrity or timing performance. This NC designation is consistent across all variants (LH1525AT, LH1525AAB, LH1525AABTR) and is not a placeholder for future functionality.
LH1525AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1525
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Through Hole
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.16VDC
- Voltage - Load:
- 0 V ~ 400 V
- Load Current:
- 250 mA
- On-State Resistance (Max):
- 36 Ohms
- Termination Style:
- PC Pin
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-DIP
- Approval Agency:
- cUL, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1525AT FAQ
1.How can I place an order for LH1525AT through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1525AT 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 LH1525AT reliable?
The price and inventory of LH1525AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1525AT is usually 5 days.
3.What payment methods are accepted for LH1525AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1525AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1525AT?
LH1525AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1525AT 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 LH1525AT?
For technical support, including LH1525AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1525AT requirements.
6.How does Aetrix verify that LH1525AT is sourced from the original manufacturer or authorized distributors?
All LH1525AT 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 LH1525AT meets industry standards.
7.What is the process for return or replacement of LH1525AT?
All LH1525AT units undergo pre-shipment inspection (PSI). If there is an issue with LH1525AT, 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 LH1525AT part is unused and in its original packaging.
Return procedure for LH1525AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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