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Vishay Semiconductor Opto Division LH1535AAB
- Part No.:
- LH1535AAB
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1535AAB.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:3,305
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Product details
Overview
LH1535AAB from Vishay Semiconductors is a surface-mount, SPST normally open solid-state relay (Form A) with integrated GaAlAs LED input and monolithic high-voltage dielectrically isolated MOSFET output. It delivers 400 V load voltage rating, 120 mA continuous bidirectional load current, 20 Ω typical on-resistance, and 5300 VRMS input-output isolation - designed for telecom switching, ground fault detection, and industrial control interfaces where bounce-free, low-power switching is required.
For engineers reviewing the LH1535AAB datasheet, LH1535AAB pinout, LH1535AAB application, or LH1535AAB equivalent, this device is evaluated for reliability in overvoltage-prone telecom line cards, precision instrumentation signal path switching, and safety-critical industrial I/O modules requiring certified isolation and current-limiting protection.
Technical Context
The LH1535AAB integrates a photodiode array, switch control logic, and dual MOSFETs in a single die using high-voltage dielectric isolation. Its current-limiting circuitry activates at ±6 V across pins 4 and 6, meeting FCC 68.302 surge requirements when external overvoltage protection is present.
It operates as a unidirectionally triggered optically coupled switch: LED activation initiates MOSFET conduction, while inherent design ensures clean turn-on/turn-off transitions (typ. 2 ms each) without contact bounce or arcing. Isolation performance complies with UL1577 (5300 VRMS), CSA, and FIMKO standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage | 400 V - supports AC/DC line-level telecom and industrial bus voltages without external snubbing. |
| Continuous Load Current | 120 mA bidirectional - sufficient for driving telecom ring generators, solenoid drivers, and PLC I/O loads. |
| On-Resistance | 20 Ω typical (AC/DC, 50 mA) - limits power dissipation to ≤550 mW under full load, enabling compact SMD layout. |
| Isolation Voltage | 5300 VRMS - meets reinforced insulation requirements for Class I equipment per UL/CSA/FIMKO. |
| Current Limit Threshold | 210 mA typical (±6 V, 5 ms pulse) - protects downstream circuitry during transient overloads without latch-up. |
| Turn-on/Off Time | 2 ms typ. each - enables reliable timing in <500 Hz switching applications such as metering and alarm circuits. |
| Input LED Forward Voltage | 1.27 V typ. @ 10 mA - compatible with standard 3.3 V/5 V logic-level drive without series resistor recalibration. |
Pinout & Package
SMD-6 package (JEDEC MS-012AC variant), 7.62 mm lead pitch, RoHS-compliant, tape-and-reel ready. Pin 1 marked by bevelled corner and dot; body dimensions 8.7 × 6.5 × 3.3 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | LED Anode | Input control terminal; requires ≥0.75 mA to initiate switching - compatible with microcontroller GPIO or logic buffers. |
| 2 | LED Cathode | Ground reference for input side; ties to system logic ground, electrically isolated from output terminals. |
| 3 | Output Source (S') | High-side MOSFET source; connects to load return path in high-side switch configuration. |
| 4 | Output Drain (S) | Switch output terminal; carries full load current; current-limit sensing occurs between pins 4 and 6. |
| 5 | Output Drain (S) | Dual-drain configuration - pins 4 and 5 are internally paralleled for enhanced current handling and thermal distribution. |
| 6 | Output Source (S') | Low-side MOSFET source; completes bidirectional conduction path; used with pin 3 for symmetrical AC switching. |
Key Features
| Feature | Design Value |
|---|---|
| Current-limit protection | Self-activating 210 mA threshold prevents damage during surge events without external components. |
| Dielectrically isolated MOSFET output | Enables 5300 VRMS isolation and >10¹² Ω insulation resistance at 25 °C - critical for medical-grade isolation zones. |
| Bounce-free switching | No mechanical contact wear or arcing; eliminates EMI from relay chatter in sensitive analog measurement paths. |
| Low power LED drive | 0.75 mA turn-on threshold reduces MCU I/O loading and extends battery life in portable test equipment. |
| SMD-6 footprint compatibility | Matches industry-standard SOIC-6 land pattern - allows drop-in replacement of legacy opto-relays without PCB redesign. |
Applications
| Telecom Line Card Switching | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Selectively connecting/disconnecting subscriber line interface circuits (SLIC) during fault detection or maintenance mode. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, bidirectional AC/DC switching between central office and loop plant. Use Value: Eliminates mechanical relay wear and contact oxidation, ensuring >10⁷ operations in humid, high-surge telecom environments. |
Use Scenario: Isolating 24 V DC sensor inputs or 120 V AC actuator outputs in programmable logic controller backplanes. IC Role / Device Role / Timing Role: Input/output channel isolator with integrated current limiting, replacing discrete optocoupler + MOSFET combos. Use Value: Reduces BOM count by 3 parts per channel and guarantees <2 ms response time for safety-critical emergency stop sequencing. |
| Ground Fault Detection Circuit | Precision Instrumentation Signal Routing |
|
Use Scenario: Monitoring leakage current across isolated power domains in medical diagnostic equipment or EV charging stations. IC Role / Device Role / Timing Role: High-voltage sense-path switch enabling periodic self-test of isolation barriers without interrupting operation. Use Value: Maintains 400 V working voltage margin while delivering <200 nA off-state leakage - essential for IEC 60601-1 compliance. |
Use Scenario: Multiplexing low-level analog signals (e.g., thermocouple, strain gauge) into shared ADC front-ends in data acquisition systems. IC Role / Device Role / Timing Role: Low-offset, low-capacitance (<22 pF) analog switch with optical isolation to prevent ground loop noise injection. Use Value: Achieves <0.4 V switch offset and <9 pF output capacitance at 50 V - preserving signal integrity in µV-range measurements. |
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 voltage, but 35 Ω typical RON and no integrated current limiting. | Better suited for AC mains switching; less ideal for low-RON telecom signal routing. | Select VO3120 only when >400 V blocking is mandatory and current limiting can be implemented externally. |
| IXYS CPC1976Y | Same SMD-6 package, 400 V rating, but 160 mA load current and 18 Ω RON - lacks FCC 68.302-compliant current limit. | Compatible for general-purpose switching, but not certified for telecom surge immunity without added protection. | Choose CPC1976Y for cost-sensitive industrial controls where regulatory surge testing is not required. |
Compared with VO3120 and CPC1976Y, the LH1535AAB uniquely combines certified FCC 68.302 current limiting, 20 Ω RON, and 5300 VRMS isolation in a single SMD-6 package - making it the only option qualified for telecom line card safety-critical switching without supplemental circuitry.
Availability
LH1535AAB is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC I/O modules, and ground fault detection systems requiring stable component supply, long-term lifecycle support, and certified isolation performance.
Supply support for LH1535AAB 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 high-voltage performance.
The LH1535AAB belongs to Vishay's LH-series solid-state relays - engineered specifically for telecom, instrumentation, and industrial control applications demanding certified isolation, surge resilience, and maintenance-free operation.
FAQ
What is the maximum continuous load current rating for the LH1535AAB?
The LH1535AAB supports 120 mA continuous bidirectional load current and 250 mA unidirectional load current at 25 °C ambient. Derating applies above 25 °C per Figure 4 in the datasheet; at 85 °C, bidirectional current drops to ~85 mA. This rating ensures safe operation in telecom line cards and industrial I/O without external heat sinking.
Does the LH1535AAB require external current-limiting components?
No - the LH1535AAB incorporates internal current-limiting circuitry that activates at ±6 V across pins 4 and 6, delivering 210 mA typical limit current. This feature meets FCC 68.302 surge requirements when external overvoltage protection is provided, eliminating need for external fuses or current-sense resistors in compliant designs.
What is the isolation voltage rating and safety certifications for the LH1535AAB?
The LH1535AAB is rated for 5300 VRMS input-to-output isolation and certified to UL1577 (file E52744), CSA (093751), and FIMKO (25419). Its insulation meets IEC 60664-1 pollution degree 2, CTI ≥175, and minimum 7 mm creepage/clearance - qualifying it for reinforced insulation in Class I equipment per IEC 61010-1.
Can the LH1535AAB switch AC signals, and what is its maximum AC load voltage?
Yes - the LH1535AAB supports bidirectional AC/DC switching up to 400 V peak (including AC sine wave peaks). Its dual-source/dual-drain MOSFET structure enables true AC conduction, and its 20 Ω typical on-resistance remains stable across temperature, making it suitable for 50/60 Hz line-frequency telecom and industrial control applications.
What is the recommended LED drive current to ensure reliable turn-on of the LH1535AAB?
A minimum of 0.75 mA LED forward current is required for guaranteed turn-on at 25 °C; 2 mA is typical. At -40 °C, turn-on current rises to ~3.5 mA (per Fig. 18), so designs must ensure ≥4 mA drive capability across full temperature range. The LH1535AAB's 1.27 V typical VF at 10 mA simplifies interface with 3.3 V or 5 V logic sources.
LH1535AAB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1535
- Packaging:
- Tube
- Product Status:
- Obsolete
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.27VDC
- Voltage - Load:
- 0 V ~ 400 V
- Load Current:
- 120 mA
- On-State Resistance (Max):
- 20 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-SMD
- Approval Agency:
- CSA, FIMKO, UL
- Grade:
- -
- Qualification:
- -
LH1535AAB FAQ
1.How can I place an order for LH1535AAB through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1535AAB 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 LH1535AAB reliable?
The price and inventory of LH1535AAB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1535AAB is usually 5 days.
3.What payment methods are accepted for LH1535AAB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1535AAB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1535AAB?
LH1535AAB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1535AAB 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 LH1535AAB?
For technical support, including LH1535AAB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1535AAB requirements.
6.How does Aetrix verify that LH1535AAB is sourced from the original manufacturer or authorized distributors?
All LH1535AAB 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 LH1535AAB meets industry standards.
7.What is the process for return or replacement of LH1535AAB?
All LH1535AAB units undergo pre-shipment inspection (PSI). If there is an issue with LH1535AAB, 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 LH1535AAB part is unused and in its original packaging.
Return procedure for LH1535AAB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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