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Vishay Semiconductor Opto Division LH1540AABTR
- Part No.:
- LH1540AABTR
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1540AABTR.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:3,782
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Product details
Overview
LH1540AABTR from Vishay Semiconductors is a 1-Form-A solid-state relay (SSR) with GaAlAs LED input and MOSFET output, delivering 5300 VRMS isolation, 22 Ω typical on-resistance (AC/DC), 350 V load voltage rating, and 120 mA continuous AC/DC load current - deployed in telecom switching and ground fault protection circuits.
For engineers reviewing the LH1540AABTR datasheet, LH1540AABTR pinout, LH1540AABTR application, or LH1540AABTR equivalent, this device is selected for high-isolation, bounce-free switching in safety-critical industrial controls and instrumentation where electromechanical relay replacement is required without sacrificing reliability or lifetime.
Technical Context
The LH1540AABTR integrates an infrared LED optically coupled to dual-MOSFET output stage, enabling galvanic isolation between control and load sides. Its architecture supports both AC and DC load configurations with distinct RON (22 Ω typ. AC/DC vs. 5.2 Ω typ. DC-only) and IL ratings (120 mA vs. 250 mA).
It meets DIN EN 60747-5-5 (VDE 0884) and UL/cUL safety standards, with 8000 VPEAK transient isolation voltage, 7 mm creepage/clearance, and ≥0.4 mm insulation thickness - confirming suitability for reinforced insulation in functional safety designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - enables safe separation of control logic (e.g., microcontroller GPIO) from 350 V AC/DC loads in telecom and industrial systems. |
| On-Resistance (AC/DC) | 22 Ω typical - limits I²R power loss to ≤132 mW at 120 mA, supporting thermally constrained PCB layouts. |
| Load Voltage Rating | 350 V - supports direct interface with standard AC mains (230 VRMS) and high-voltage DC bus monitoring applications. |
| Continuous Load Current | 120 mA (AC/DC), 250 mA (DC-only) - defines maximum sustainable switching capacity depending on load type and thermal management. |
| Turn-On / Turn-Off Time | 0.13 ms / 0.05 ms typical - ensures fast, deterministic switching for pulse-width modulated control and digital signal routing. |
| Input Forward Current (Turn-On) | 0.3–2 mA - allows direct drive from low-power MCU outputs without external amplification. |
| Off-State Leakage | <1 nA at ±100 V, 6 nA at ±350 V - guarantees minimal false triggering in high-impedance sensing or battery-backed circuits. |
Pinout & Package
SMD-6 surface-mount package (7.25 mm × 6.65 mm × 2.54 mm height), 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 positive side of current-limited LED driver; requires series resistor for IF control (e.g., 5 mA @ 3.3 V → ~600 Ω). |
| 2 (Cathode) | LED Cathode Input | Ground reference for input LED; polarity-sensitive - reverse connection prevents activation. |
| 3 (Source) | MOSFET Source Terminal | Common return path for load current; tied to system ground or negative rail in DC-only configuration. |
| 4 (Drain) | MOSFET Drain Terminal | High-side switch node; connects to load's high-potential side (e.g., AC line hot or DC+). |
| 5 (Load +) | AC/DC Load Terminal (+) | Used only in AC/DC configuration; connects to one side of bidirectional load (e.g., AC solenoid or heater). |
| 6 (Load –) | AC/DC Load Terminal (–) | Used only in AC/DC configuration; completes bidirectional current path across internal back-to-back MOSFETs. |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Eliminates contact arcing and EMI spikes common in electromechanical relays - critical for noise-sensitive telecom and instrumentation. |
| 5300 VRMS isolation test voltage | Meets reinforced insulation requirements per UL 1577 and VDE 0884 - enables use in SELV/PELV circuits without additional barriers. |
| Low input drive requirement (0.3 mA turn-on) | Reduces MCU GPIO loading and eliminates need for discrete transistor drivers - simplifies control-side circuitry. |
| 7 mm creepage and clearance | Supports 350 V working voltage per IEC 60664-1 - satisfies spacing requirements for Pollution Degree 2 environments. |
| 0.4 mm minimum insulation thickness | Validates dielectric integrity under long-term partial discharge stress - essential for >10-year field reliability in industrial controls. |
Applications
| Telecom Line Switching | Ground Fault Detection Circuit |
|---|---|
|
Use Scenario: Isolating and switching POTS line signals or DSLAM control paths in telecom central office equipment. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, zero-crossing–free switching of analog voice/data lines. Use Value: Replaces slow, wear-prone EM relays while maintaining signal integrity up to 350 V and eliminating contact oxidation failure modes. |
Use Scenario: Monitoring leakage current between AC mains and chassis ground in medical or industrial power supplies. IC Role / Device Role / Timing Role: High-isolation switch enabling safe sampling of fault current through precision shunt resistors. Use Value: 5300 VRMS isolation and <1 nA off-state leakage ensure measurement accuracy and prevent false trips during low-level fault detection. |
| Security System Zone Control | Industrial PLC Output Module |
|
Use Scenario: Controlling door locks, alarm sirens, or sensor zone enable lines in Class 2 security panels. IC Role / Device Role / Timing Role: Optically isolated SPST NO switch driving 24 V DC or 120 V AC peripheral loads. Use Value: 120 mA load current and 22 Ω RON support direct actuation of electromagnetic locks without external drivers. |
Use Scenario: Providing isolated digital output channels in modular PLC backplanes for motor starters or valve actuators. IC Role / Device Role / Timing Role: Safety-rated SSR output stage handling 350 V AC/DC loads with UL/cUL/VDE certification. Use Value: Agency approvals and 890 VPEAK repetitive isolation voltage meet IEC 61000-4-5 surge immunity requirements for industrial environments. |
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 LH1540AT | DIP-6 through-hole package; identical electrical specs and safety ratings. | Preferred for prototyping, manual assembly, or legacy board designs requiring through-hole mounting. | Select LH1540AT when SMT reflow capability is unavailable or mechanical robustness under vibration is prioritized. |
| IXYS CPC1976Y | 4000 VRMS isolation; 1.2 Ω RON; 250 mA load current; SOIC-6 package. | Better suited for low-RON, high-current DC loads but lacks 350 V AC rating and VDE 0884 certification. | Choose CPC1976Y only for DC-only applications demanding sub-ohm conduction loss - not for AC or safety-certified designs. |
Compared with LH1540AT, the LH1540AABTR offers identical performance in a space-saving SMD-6 footprint ideal for high-density telecom modules; versus CPC1976Y, it trades lower RON for certified 350 V AC operation and full VDE/UL safety compliance - making it the sole choice for AC-coupled ground fault and telecom line switching.
Availability
LH1540AABTR is available at Aetrix Electronics and suitable for telecom switching, ground fault detection, security system control, and industrial PLC output modules requiring stable component supply, long-life reliability, and certified safety isolation.
Supply support for LH1540AABTR 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 safety certification.
The LH1540 series belongs to Vishay's high-isolation solid-state relay product line, engineered specifically for replacing electromechanical relays in telecom infrastructure, industrial controls, and safety-critical instrumentation where lifetime, noise immunity, and regulatory compliance are mandatory.
FAQ
What is the maximum load voltage the LH1540AABTR can safely switch?
The LH1540AABTR supports a maximum DC or peak AC load voltage of 350 V. This rating applies to both AC/DC and DC-only configurations and is validated per UL 1577 and DIN EN 60747-5-5. Exceeding this voltage risks breakdown of the internal MOSFET output stage and compromises isolation integrity - always verify actual peak voltage including transients in the target application before deploying LH1540AABTR.
Does the LH1540AABTR require an external current-limiting resistor on the input LED?
Yes, the LH1540AABTR requires an external series resistor to limit forward current to ≤50 mA absolute maximum. For reliable turn-on at 0.3–2 mA, a typical design uses 5 mA at 3.3 V or 5 V logic - e.g., a 680 Ω resistor for 3.3 V MCU drive. Omitting this resistor risks permanent LED degradation and reduced LH1540AABTR lifetime.
Can the LH1540AABTR be used in AC-only load configurations?
No - the LH1540AABTR supports only two configurations: AC/DC (using pins 5 and 6) and DC-only (using pins 3 and 4). It does not support AC-only operation. For pure AC loads, the AC/DC mode must be used, which employs back-to-back MOSFETs to handle bidirectional current flow - confirmed by the pinout diagram and electrical characteristics table in the LH1540AABTR datasheet.
What safety certifications does the LH1540AABTR hold?
The LH1540AABTR is certified to UL 1577 (5300 VRMS), cUL, DIN EN 60747-5-5 (VDE 0884), and FIMKO. These cover reinforced insulation, transient overvoltage (8000 VPEAK), and pollution degree 2 compliance. Certification documentation is included in Vishay document 83833, revision 2.2, and applies specifically to the LH1540AABTR SMD-6 variant.
How does the LH1540AABTR's on-resistance vary between AC/DC and DC-only modes?
In AC/DC mode (pins 5–6 active), LH1540AABTR exhibits 22 Ω typical on-resistance; in DC-only mode (pins 3–4 active), it drops to 5.2 Ω typical. This difference arises from parallel conduction paths in DC mode versus series-connected MOSFETs in AC mode. Designers must select the correct pin configuration and derate power dissipation accordingly - e.g., 550 mW max in AC/DC vs. higher thermal margin in DC-only.
LH1540AABTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1540
- Packaging:
- Tape & Reel (TR)
- 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 ~ 350 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:
- cUL, DIN, FIMKO, UL
- Grade:
- -
- Qualification:
- -
LH1540AABTR FAQ
1.How can I place an order for LH1540AABTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1540AABTR 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 LH1540AABTR reliable?
The price and inventory of LH1540AABTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1540AABTR is usually 5 days.
3.What payment methods are accepted for LH1540AABTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1540AABTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1540AABTR?
LH1540AABTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1540AABTR 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 LH1540AABTR?
For technical support, including LH1540AABTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1540AABTR requirements.
6.How does Aetrix verify that LH1540AABTR is sourced from the original manufacturer or authorized distributors?
All LH1540AABTR 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 LH1540AABTR meets industry standards.
7.What is the process for return or replacement of LH1540AABTR?
All LH1540AABTR units undergo pre-shipment inspection (PSI). If there is an issue with LH1540AABTR, 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 LH1540AABTR part is unused and in its original packaging.
Return procedure for LH1540AABTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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