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Vishay Semiconductor Opto Division LH1518AAB
- Part No.:
- LH1518AAB
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1518AAB.pdf
- Description:
- SSR RELAY SPST-NO 300MA 0-250V
- Quantity:
- Payment:
- Shipping:
Inventory:2,310
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Product details
Overview
LH1518AAB from Vishay Semiconductors is a solid-state relay (SPST, Form A, normally open) combining a GaAlAs LED input and high-reliability MOSFET output switch. It delivers 5300 VRMS isolation, supports 250 V load voltage and 155 mA continuous AC/DC load current, and replaces electromechanical relays in telecom switching and industrial control systems.
For engineers reviewing the LH1518AAB datasheet, LH1518AAB pinout, LH1518AAB application, or LH1518AAB equivalent, this page provides verified technical context, package mapping to SMD-6, real-world switching performance (0.20 ms typical turn-on), safety certifications (UL 1577, VDE 0884-5), and validated alternative options for relay replacement designs.
Technical Context
The LH1518AAB uses optically isolated control: a GaAlAs infrared LED drives two matched MOSFETs configured as a back-to-back AC/DC switch. Its internal architecture enables bounce-free operation and zero-crossing–independent switching due to MOSFET-based conduction.
It meets reinforced insulation requirements per DIN EN 60747-5-5 (VDE 0884-5) with 890 Vpeak repetitive peak isolation voltage and 8000 Vpeak transient isolation voltage. The device operates across –40 °C to +85 °C ambient and maintains ≥10¹² Ω insulation resistance at 500 V and 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - qualifies for reinforced insulation in safety-critical industrial and telecom equipment |
| Load Voltage Rating | 250 V - supports mains-connected AC loads and DC bus switching up to 250 V |
| Continuous Load Current | 155 mA (AC/DC config) - sufficient for signal-level and low-power control loads like solenoids, indicators, and sensor interfaces |
| On-Resistance | 6–20 Ω (AC/DC) - ensures low conduction loss and minimal self-heating under rated load |
| Turn-On / Turn-Off Time | 0.20 ms / 0.03 ms typical - enables fast digital control response without mechanical delay or contact wear |
| Input Forward Current (Turn-On) | 0.4–2 mA typical - compatible with standard logic-level GPIO or microcontroller outputs without external drivers |
| Off-State Leakage | <1 nA at ±100 V - guarantees high impedance blocking state for precision signal routing and low-power standby |
Pinout & Package
SMD-6 surface-mount package (7.62 mm pitch, 9.80 × 6.65 mm body); RoHS-compliant, moisture sensitivity level 1, lead-free reflow compatible per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED anode input | Connects to current-limited logic-high source; requires ≥1.15 V forward bias |
| 2 (Cathode) | LED cathode input | Ground reference for input side; defines LED polarity and enables standard low-side drive |
| 3 (Source 1) | MOSFET source terminal (Channel 1) | Common output node for back-to-back MOSFET pair; tied internally to pin 4 in AC/DC config |
| 4 (Drain 1) | MOSFET drain terminal (Channel 1) | One AC/DC load connection point; used with pin 3 for bidirectional switching |
| 5 (Drain 2) | MOSFET drain terminal (Channel 2) | Second AC/DC load connection; pins 3–4–5 form full SPST AC/DC switch terminals |
| 6 (Source 2) | MOSFET source terminal (Channel 2) | Internally connected to pin 3; completes symmetrical MOSFET pairing for true AC capability |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Eliminates contact arcing and EMI spikes common in electromechanical relays, improving signal integrity in test and measurement systems |
| Low power consumption input | 0.4–2 mA turn-on current enables direct drive from 3.3 V or 5 V MCUs without buffer stages |
| High off-resistance | 0.5–5000 GΩ ensures negligible leakage in high-impedance circuits such as analog multiplexers or sensor bias networks |
| Reinforced safety certification | UL 1577, cUL, VDE 0884-5, and FIMKO approvals allow use in Class I and Class II equipment requiring double insulation |
| Wide temperature operation | –40 °C to +85 °C ambient range supports deployment in uncontrolled industrial cabinets and outdoor telecom enclosures |
Applications
| Telecom Line Switching | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Routing of POTS line signals or DSL supervision tones between central office test ports and subscriber lines. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, bounce-free path selection for analog voice-frequency signals. Use Value: Prevents contact oxidation-induced insertion loss drift and eliminates relay chatter noise during automated line testing sequences. |
Use Scenario: Isolating 24 V DC field inputs (e.g., limit switches, proximity sensors) from PLC controller logic. IC Role / Device Role / Timing Role: Input-side SSR replacing mechanical relay for dry-contact interface conditioning with optical isolation. Use Value: Enables >1 million operations lifetime versus ~100k for EM relays, reducing maintenance in factory automation cells. |
| Automatic Test Equipment (ATE) | Medical Instrumentation Signal Routing |
Use Scenario: Multiplexing DUT power rails or stimulus signals in semiconductor burn-in and functional testers. IC Role / Device Role / Timing Role: Low-leakage, fast-switching SPST relay for configuring test paths without signal corruption. Use Value: Sub-millisecond switching and <1 nA off-state leakage preserve measurement accuracy during high-impedance voltage/current sourcing. |
Use Scenario: Isolating patient-connected sensor inputs (e.g., ECG leads) from internal analog front-end circuitry. IC Role / Device Role / Timing Role: Safety-rated isolation switch enabling safe signal path configuration while meeting IEC 60601 creepage/clearance requirements. Use Value: 7 mm creepage/clearance and 5300 VRMS isolation satisfy reinforced insulation requirements for BF-rated medical devices. |
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 LH1518AABTR | Identical electrical specs and SMD-6 footprint; supplied in tape-and-reel (1000 units/reel) instead of tube packaging | No functional difference; selected for automated SMT assembly lines requiring reel-fed placement | Choose LH1518AABTR when volume production demands pick-and-place compatibility and reduced handling labor |
| Vishay LH1518AT | DIP-6 through-hole package (7.62 mm pitch); identical isolation, load ratings, and timing specs but different mounting and thermal profile | Suitable for prototyping, low-volume industrial controls, or legacy board designs requiring through-hole reliability | Select LH1518AT for hand-soldered prototypes, repair boards, or applications where DIP mechanical robustness outweighs SMT density benefits |
Compared with LH1518AAB, the LH1518AABTR offers identical performance in tape-and-reel format for SMT scalability, while the LH1518AT provides the same core relay functionality in a DIP-6 package-enabling design reuse across SMD and through-hole platforms without circuit redesign.
Availability
LH1518AAB is available at Aetrix Electronics and suitable for telecom switching, industrial PLC I/O modules, and automatic test equipment requiring stable component supply, long-term lifecycle support, and certified safety isolation.
Supply support for LH1518AAB 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 elements with emphasis on reliability and safety certification.
The LH1518AAB belongs to Vishay's LH1518 series of optically coupled solid-state relays, designed specifically to replace electromechanical relays in safety-isolated control applications demanding long life, low power, and zero-bounce switching.
FAQ
What is the maximum load voltage rating for the LH1518AAB?
The LH1518AAB has a maximum DC or peak AC load voltage rating of 250 V, as specified in its absolute maximum ratings table. This rating applies across the full operating temperature range (–40 °C to +85 °C) and is validated per UL 1577 and VDE 0884-5 safety standards. Exceeding 250 V risks breakdown of the internal MOSFET output stage and voids safety certification compliance.
Does the LH1518AAB support AC load switching?
Yes, the LH1518AAB supports AC load switching in its default AC/DC configuration using pins 3, 4, and 5 as a bidirectional SPST switch. Its back-to-back MOSFET structure allows conduction in both directions, enabling true zero-voltage turn-off and clean AC waveform handling up to 250 V RMS. The datasheet confirms this mode supports 155 mA continuous current.
What is the typical turn-on time for the LH1518AAB at 5 mA input current?
The typical turn-on time for the LH1518AAB is 0.20 ms when driven with 5 mA forward current and loaded with 50 mA, per the switching characteristics table. This value remains stable across –40 °C to +85 °C ambient, with normalized curves showing ≤2× variation over temperature. The fast response eliminates mechanical delay inherent in EM relays.
How is isolation performance verified for the LH1518AAB?
Isolation performance for the LH1518AAB is verified via 100% production testing at 1669 Vpeak (method B, 1 s duration) and sample testing at 1424 Vpeak (method A, 10 s), both with partial discharge <5 pC. These tests comply with UL 1577 (5300 VRMS withstand) and DIN EN 60747-5-5 (VIORM = 890 Vpeak), ensuring reinforced insulation integrity for safety-critical designs.
Can the LH1518AAB be directly driven by a 3.3 V microcontroller GPIO?
Yes, the LH1518AAB can be directly driven by a 3.3 V microcontroller GPIO. Its LED forward voltage is 1.15–1.6 V at 10 mA, and turn-on current is as low as 0.4 mA typical. With a 220 Ω series resistor, a 3.3 V GPIO delivers ~10 mA - well within the 50 mA absolute maximum and optimal for fast, reliable switching without external drivers.
LH1518AAB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1518
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.26VDC
- Voltage - Load:
- 0 V ~ 250 V
- Load Current:
- 300 mA
- On-State Resistance (Max):
- 20 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-SMD
- Approval Agency:
- cUL, DIN, FIMKO, UL
- Grade:
- -
- Qualification:
- -
LH1518AAB FAQ
1.How can I place an order for LH1518AAB through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1518AAB 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 LH1518AAB reliable?
The price and inventory of LH1518AAB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1518AAB is usually 5 days.
3.What payment methods are accepted for LH1518AAB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1518AAB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1518AAB?
LH1518AAB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1518AAB 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 LH1518AAB?
For technical support, including LH1518AAB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1518AAB requirements.
6.How does Aetrix verify that LH1518AAB is sourced from the original manufacturer or authorized distributors?
All LH1518AAB 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 LH1518AAB meets industry standards.
7.What is the process for return or replacement of LH1518AAB?
All LH1518AAB units undergo pre-shipment inspection (PSI). If there is an issue with LH1518AAB, 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 LH1518AAB part is unused and in its original packaging.
Return procedure for LH1518AAB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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