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Vishay Semiconductor Opto Division LH1525AAB
- Part No.:
- LH1525AAB
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1525AAB.pdf
- Description:
- SSR RELAY SPST-NO 250MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:1,454
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Product details
Overview
LH1525AAB from Vishay Semiconductors is a surface-mount, single-pole single-throw (SPST) normally open solid-state relay with GaAlAs LED input and MOSFET output, rated for 400 V load voltage, 250 mA DC-only continuous load current, and 5300 VRMS isolation voltage - used in battery-powered industrial controls and telecom switching where clean, bounce-free operation is required.
For engineers reviewing the LH1525AAB datasheet, LH1525AAB pinout, LH1525AAB application, or LH1525AAB equivalent, key selection criteria include its low 0.9 mA turn-on LED drive current, 5–8.25 Ω on-resistance in DC-only mode, 0.15 ms typical turn-on time at 5 mA drive, and SMD-6 package compatibility with automated assembly.
Technical Context
The LH1525AAB integrates an infrared GaAlAs LED optically coupled to a pair of back-to-back MOSFETs, enabling AC/DC or DC-only switching configurations via external pin strapping. Its internal photodiode feedback ensures stable threshold behavior across temperature.
It operates as a galvanically isolated load switch with no mechanical contacts, delivering <1 nA off-state leakage at ±100 V and 6 nA at ±400 V, while maintaining 0.7 pF input-to-output capacitance and 39 pF output capacitance at 1 V - critical for high-noise immunity in programmable logic controller I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage Rating | 400 V - supports mains-referenced DC loads up to Class II insulation limits |
| DC Continuous Load Current | 250 mA - enables direct driving of solenoids, LEDs, and small relays without external buffering |
| Turn-On LED Current | ≤ 0.9 mA @ 10 ms - allows direct interface with ultra-low-power microcontrollers (e.g., ARM Cortex-M0+ GPIO) |
| On-Resistance (DC mode) | 5–8.25 Ω - limits power dissipation to ≤550 mW at full 250 mA load |
| Isolation Voltage | 5300 VRMS - certified for reinforced insulation per UL, cUL, VDE, and FIMKO standards |
| Turn-On / Turn-Off Time | 0.15 ms / 0.05 ms typical @ 5 mA - supports PWM-based dimming and fast sequencing in instrumentation |
| Input-to-Output Capacitance | 0.7 pF - minimizes noise coupling in high-speed digital control environments |
Pinout & Package
SMD-6 package (7.62 mm pitch, 9.80 × 6.65 mm body), RoHS-compliant, lead-free reflow compatible per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED Anode Input | Connects to MCU GPIO or driver; requires series resistor for current limiting at 1.5–5 mA |
| 2 (Cathode) | LED Cathode Input | Ground reference for LED circuit; common return for optical input stage |
| 3 (NC) | No Connect | Internally unconnected; must remain floating - not for grounding or biasing |
| 4 (Load +) | Output Source (DC mode) | High-side load connection in DC-only configuration; ties to positive rail of switched load |
| 5 (Load –) | Output Sink (DC mode) | Low-side load return in DC-only configuration; connects to load ground or negative rail |
| 6 (Common) | AC/DC Output Common | Shared terminal for AC/DC mode; used with pins 4 & 5 for bidirectional switching |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Zero contact arcing or mechanical wear - eliminates EMI spikes and timing jitter in precision sequencing |
| Low 0.9 mA turn-on LED current | Reduces system standby power by >90% vs. electromechanical relays; extends battery life in portable controllers |
| 5300 VRMS reinforced isolation | Meets safety requirements for functional isolation in Class I equipment without additional barrier design |
| Surface-mount SMD-6 footprint | Enables high-density PCB layout and full automation compatibility - no through-hole assembly required |
| DC-only and AC/DC dual-mode operation | Configurable via pin strapping (pins 4/5/6) - supports both unidirectional and bidirectional load control |
Applications
| Industrial PLC I/O Modules | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Isolated digital output channel switching 24 V DC solenoids and indicator LEDs in factory-floor controllers. IC Role / Device Role / Timing Role: Solid-state relay providing galvanic isolation and zero-crossing–free switching between field-side and logic-side circuits. Use Value: Eliminates contact welding and bounce-induced false triggers; supports 10⁶+ operations with no degradation in on-resistance or leakage. |
Use Scenario: Portable multimeter or signal generator using coin-cell or Li-ion power with isolated output switching. IC Role / Device Role / Timing Role: Low-power load switch enabling instrument self-test, range selection, and output enable/disable functions. Use Value: Draws ≤0.9 mA LED current - extends 200 mAh battery life to >1 year in intermittent-use applications. |
| Telecom Line Card Protection | Medical Diagnostic Instrumentation |
Use Scenario: Hot-swap protection and signal path routing in modular telecom line cards handling -48 V DC power feeds. IC Role / Device Role / Timing Role: Isolated SPST switch controlling power delivery to daughterboards or auxiliary circuits during insertion/removal. Use Value: Withstands 400 V load voltage and delivers <6 nA off-state leakage at full rating - prevents false tripping in high-impedance monitoring paths. |
Use Scenario: Isolating patient-connected sensor excitation circuits from main processor in ECG or EEG front-ends. IC Role / Device Role / Timing Role: Safety-rated load switch enabling safe channel calibration and sensor disconnect under microcontroller control. Use Value: 5300 VRMS isolation and ≥10¹² Ω insulation resistance meet IEC 60601-1 creepage/clearance requirements without external barriers. |
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 VO3120 | Higher 600 V load rating; 1.2 mA min. turn-on current; DIP-6 only | Better suited for AC mains interfacing; lacks SMD-6 option and DC-only mode flexibility | Select when higher voltage margin or legacy through-hole assembly is required |
| IXYS CPC1976Y | Lower 1.5 Ω on-resistance (DC mode); 1.5 mA turn-on current; same SMD-6 package | Superior thermal performance at high load currents but consumes more drive power | Prefer for high-duty-cycle DC loads where conduction loss dominates over drive efficiency |
Compared with VO3120 and CPC1976Y, the LH1525AAB uniquely balances ultra-low drive current (≤0.9 mA), dual-mode AC/DC/DC-only configuration, and SMD-6 manufacturability - making it optimal for space-constrained, battery-sensitive industrial and telecom designs requiring safety-certified isolation.
Availability
LH1525AAB is available at Aetrix Electronics and suitable for industrial PLC I/O modules, battery-powered test equipment, telecom line card protection, and medical diagnostic instrumentation requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for LH1525AAB 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, sensors, and optoelectronics with emphasis on reliability, safety certification, and high-voltage isolation performance.
The LH1525AAB belongs to Vishay's LHxx25 solid-state relay family, engineered specifically for replacing electromechanical relays in space-, power-, and reliability-critical applications across industrial automation and communications infrastructure.
FAQ
What is the maximum continuous load current rating for LH1525AAB in DC-only mode?
The LH1525AAB supports up to 250 mA continuous load current in DC-only configuration (pins 4 and 5 active), verified per Vishay Document 83823 Section "Absolute Maximum Ratings". This rating applies at ambient temperatures up to +85 °C with appropriate PCB copper area for thermal dissipation. Exceeding this current risks exceeding the 550 mW SSR output power dissipation limit and thermal runaway.
Can LH1525AAB be used for AC load switching?
Yes, the LH1525AAB supports AC/DC load switching when configured using pins 4 (Load +), 5 (Load –), and 6 (Common) per Figure 1 in Vishay Document 83823. In AC mode, its continuous load current is rated at 125 mA (vs. 250 mA in DC-only mode), and it maintains clean zero-crossing–free switching due to MOSFET output architecture - unlike TRIAC-based SSRs.
What is the minimum LED forward current required to reliably turn on LH1525AAB?
The LH1525AAB guarantees turn-on with ≤0.9 mA LED forward current for 10 ms pulses (IFon), per Electrical Characteristics table in Vishay Document 83823. For robust operation across temperature and unit variation, design to 1.5 mA - which also ensures stable 22–36 Ω on-resistance in AC/DC mode and meets the 0.15 ms typical turn-on time spec at 5 mA drive.
Does LH1525AAB require external snubber circuits for inductive loads?
No, the LH1525AAB does not require external snubbers for typical inductive loads (e.g., 24 V DC solenoids) due to its MOSFET output structure and built-in voltage clamping. However, for loads with stored energy >100 mJ or peak flyback voltages exceeding 400 V, a TVS diode rated ≥450 V across the load is recommended - as noted in Vishay Application Note AN-301 for LH-series SSRs.
Is LH1525AAB compliant with RoHS and REACH regulations?
Yes, the LH1525AAB is RoHS-compliant (lead-free) and REACH-conformant, as confirmed in Vishay Document 83823 Section "Material categorization" and supported by Vishay's public compliance portal (www.vishay.com/doc?99912). Its SMD-6 package uses matte tin terminations and passes JEDEC J-STD-020 reflow profiles without lead contamination.
LH1525AAB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1525
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- 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:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-SMD
- Approval Agency:
- cUL, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1525AAB FAQ
1.How can I place an order for LH1525AAB through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1525AAB 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 LH1525AAB reliable?
The price and inventory of LH1525AAB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1525AAB is usually 5 days.
3.What payment methods are accepted for LH1525AAB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1525AAB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1525AAB?
LH1525AAB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1525AAB 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 LH1525AAB?
For technical support, including LH1525AAB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1525AAB requirements.
6.How does Aetrix verify that LH1525AAB is sourced from the original manufacturer or authorized distributors?
All LH1525AAB 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 LH1525AAB meets industry standards.
7.What is the process for return or replacement of LH1525AAB?
All LH1525AAB units undergo pre-shipment inspection (PSI). If there is an issue with LH1525AAB, 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 LH1525AAB part is unused and in its original packaging.
Return procedure for LH1525AAB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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