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Vishay Semiconductor Opto Division LH1540AT-X016
- Part No.:
- LH1540AT-X016
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-DIP (0.300", 7.62mm)
- Datasheet:
-
LH1540AT-X016.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:2,634
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Product details
Overview
LH1540AT-X016 from Vishay Semiconductors is a 1-Form-A solid-state relay (SSR) with GaAlAs LED input and MOSFET output, rated for 350 V load voltage and 120 mA AC/DC continuous load current, featuring 5300 VRMS isolation and 22 Ω typical on-resistance - used in telecom switching and ground fault protection circuits.
For engineers reviewing the LH1540AT-X016 datasheet, LH1540AT-X016 pinout, LH1540AT-X016 application, or LH1540AT-X016 equivalent, key selection criteria include isolation voltage compliance (UL/cUL/VDE), AC/DC vs. DC-only load configuration, thermal derating of safety power (700 mW at 25 °C), and DIP-6 package compatibility with legacy through-hole layouts.
Technical Context
The LH1540AT-X016 integrates an optically coupled GaAlAs infrared LED driving a pair of back-to-back MOSFETs to realize a normally open SPST switch. Its internal architecture enables clean bounce-free switching without mechanical wear, supporting both AC and DC loads up to 350 V.
It meets DIN EN 60747-5-5 (VDE 0884) for reinforced insulation, with 8000 VPEAK transient isolation voltage and ≥7 mm creepage/clearance. The device operates across -40 °C to +85 °C ambient, with safety-rated input current (240 mA) and output power (700 mW) defined per IEC/UL standards.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - certified for reinforced insulation per UL1577 and DIN EN 60747-5-5, enabling use in safety-critical telecom and industrial control interfaces. |
| Load Voltage Rating | 350 V - supports line-voltage AC switching (e.g., 240 VAC mains) and high-voltage DC loads without external snubbers. |
| Continuous Load Current | 120 mA (AC/DC), 250 mA (DC only) - defines maximum steady-state current handling depending on load type and thermal management. |
| On-Resistance | 22 Ω typical (AC/DC), 5.2 Ω typical (DC only) - directly impacts conduction loss and self-heating; lower RON in DC mode enables higher efficiency in battery-powered systems. |
| Turn-On/Off Time | 0.13 ms / 0.05 ms typical - enables fast digital control response, suitable for pulse-width modulated (PWM) load switching and timing-critical sequencing. |
| Input Forward Current (Turn-On) | 0.3–2 mA - ultra-low drive requirement compatible with microcontroller GPIOs without buffer stages. |
| Off-State Leakage | <1 nA at ±100 V, 6 nA at ±350 V - ensures minimal standby power loss and reliable high-impedance blocking in off state. |
Pinout & Package
DIP-6 package (7.62 mm pitch), through-hole mounting, with 6.09 mm × 3.04 mm body height and 0.70 mm lead thickness. Pin 1 marked by notch or bevel; leads are gull-wing formed for wave soldering.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED Anode Input | Connects to MCU GPIO or driver circuit; requires series resistor to limit forward current to ≤50 mA. |
| 2 (Cathode) | LED Cathode Input | Ground reference for LED side; common return for input control logic. |
| 3 (Load –) | Output Terminal (AC/DC config) | One side of bidirectional MOSFET switch; connects to load return path in AC/DC applications. |
| 4 (Load +) | Output Terminal (DC only config) | Positive-side switch terminal in DC-only mode; polarity-sensitive for unidirectional current flow. |
| 5 (Load ±) | Output Terminal (AC/DC config) | Common load connection point for AC/DC operation; used with Pin 3 for full-wave switching capability. |
| 6 (NC) | No Connect | Internally unused; must remain unconnected per datasheet to avoid reliability risk. |
Key Features
| Feature | Design Value |
|---|---|
| Reinforced Isolation | 5300 VRMS withstand voltage with ≥7 mm creepage/clearance - eliminates need for external isolation barriers in Class I/II equipment. |
| Bounce-Free Switching | No contact arcing or mechanical chatter - critical for noise-sensitive instrumentation and zero-crossing–independent control. |
| Low Drive Requirement | 0.3 mA typical turn-on current - enables direct interface with 3.3 V or 5 V MCUs without level-shifting or amplification. |
| Thermal Safety Margin | 700 mW output safety power at 25 °C, derated linearly to 0 mW at 175 °C - supports robust thermal design in enclosed enclosures. |
| High Off-Resistance | 0.5–5000 GΩ - ensures >100 dB signal isolation between input and output, essential for ground-loop elimination in telecom interfaces. |
Applications
| Telecom Line Switching | Ground Fault Detection Circuitry |
|---|---|
|
Use Scenario: Remote line card switching in DSLAMs and PON OLTs where galvanic isolation prevents ground loop interference between subscriber lines and central office equipment. IC Role / Device Role / Timing Role: Solid-state relay providing isolated SPST switching of 48 V DC or 240 VAC subscriber line feeds under microcontroller command. Use Value: Eliminates electromechanical relay wear-out and contact oxidation, ensuring >108 operations lifetime while maintaining <2 ms total switching latency. |
Use Scenario: High-impedance sensing node in residual-current circuit breakers (RCCBs) that isolates fault detection logic from live AC mains. IC Role / Device Role / Timing Role: Isolated switch enabling safe sampling of leakage current paths without compromising user safety certification. Use Value: 5300 VRMS isolation and <1 nA off-state leakage meet IEC 61000-4-5 surge immunity and EN 61000-6-2 emission requirements for Class B equipment. |
| Industrial PLC I/O Modules | Security System Zone Monitoring |
|
Use Scenario: Digital output stage in programmable logic controller modules controlling solenoids, indicator lamps, and small AC motors in factory automation. IC Role / Device Role / Timing Role: Output driver delivering 120 mA AC/DC load current with optical isolation between field-side and logic-side PCB sections. Use Value: 22 Ω RON limits power dissipation to <300 mW at full load, reducing heatsink requirements versus discrete opto-MOS solutions. |
Use Scenario: Tamper-proof zone isolation in intrusion alarm panels where each sensor loop must be electrically separated from the control board. IC Role / Device Role / Timing Role: Normally-open switch enabling/disabling individual PIR or door contact zones under microcontroller supervision. Use Value: Clean bounce-free switching prevents false alarms during zone activation/deactivation; UL/cUL/VDE approvals simplify regional certifications. |
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 LH1540AAB | SMD-6 package (vs. DIP-6); identical electrical specs and safety ratings; same pinout orientation but surface-mount footprint. | Preferred for automated assembly and space-constrained PCBs; not suitable for hand-soldered prototyping or legacy through-hole designs. | Select LH1540AAB when SMT manufacturing is required and board real estate is limited; verify reflow profile compatibility per J-STD-020. |
| IXYS CPC1976Y | Higher 400 V load voltage rating; 1.2 Ω typical RON (DC mode); 4000 VRMS isolation; SOIC-6 package. | Better suited for higher-power DC loads (e.g., EV charging control) but lacks UL/cUL approval for telecom safety-critical use. | Choose CPC1976Y only for non-certified DC applications requiring lower conduction loss; LH1540AT-X016 remains preferred where UL/VDE compliance is mandatory. |
Compared with LH1540AAB and CPC1976Y, the LH1540AT-X016 uniquely combines DIP-6 through-hole compatibility, full UL/cUL/VDE safety certification, and validated 350 V/120 mA AC/DC performance - making it the default choice for certified telecom and industrial control replacements of electromechanical relays.
Availability
LH1540AT-X016 is available at Aetrix Electronics and suitable for telecom infrastructure, ground fault protection systems, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and certified safety isolation.
Supply support for LH1540AT-X016 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 leadership in high-reliability passive and isolation devices.
The LH1540 series was designed specifically for replacing electromechanical relays in safety-critical telecom and industrial applications, emphasizing reinforced insulation, low drive current, and long operational life without contact degradation.
FAQ
What is the maximum load voltage the LH1540AT-X016 can safely switch?
The LH1540AT-X016 is rated for 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 UL1577 and DIN EN 60747-5-5 safety standards. Exceeding this voltage risks breakdown of the internal MOSFET output stage and compromises isolation integrity. Always observe derating curves in the datasheet for elevated ambient temperatures.
Does the LH1540AT-X016 require an external current-limiting resistor on the LED input?
Yes, the LH1540AT-X016 requires an external series resistor on the LED anode (Pin 1) to limit forward current to ≤50 mA absolute maximum. For typical turn-on at 0.3–2 mA, a 2.2 kΩ resistor is recommended with a 5 V supply. The resistor value must be recalculated for other supply voltages using VF = 1.4–1.6 V (at IF = 10 mA) from the datasheet's electrical characteristics table.
Can the LH1540AT-X016 be used in AC-only load applications?
No - the LH1540AT-X016 supports two distinct configurations: AC/DC (using Pins 3 and 5) and DC-only (using Pins 4 and 5). It does not support AC-only operation with polarity reversal. For true AC switching, the AC/DC configuration must be used, where the internal back-to-back MOSFETs conduct in both directions. Refer to Figure 1 and Table 1 in the Vishay datasheet for correct terminal assignment.
What safety certifications does the LH1540AT-X016 hold?
The LH1540AT-X016 is certified to UL 1577 (5300 VRMS), cUL (CSA C22.2 No. 0.5), DIN EN 60747-5-5 (VDE 0884), and FIMKO. These approvals confirm compliance with reinforced insulation requirements for functional and basic safety in end equipment. Certification marks appear on the device body and are documented in Vishay's Certificate of Compliance (Doc. #83833).
How does the LH1540AT-X016 differ from the LH1540AT without the "-X016" suffix?
The "-X016" suffix denotes a specific tape-and-reel packaging variant for the LH1540AT base part. Electrically and mechanically, LH1540AT-X016 is identical to LH1540AT (DIP-6, tube-packed version); the only difference is packaging format - X016 indicates 1000-unit reels optimized for automated pick-and-place. Both share identical pinout, ratings, and safety certifications.
LH1540AT-X016 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1540
- Packaging:
- Tube
- Product Status:
- Obsolete
- Mounting Type:
- Through Hole
- 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:
- PC Pin
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-DIP
- Approval Agency:
- cUL, DIN, FIMKO, UL
- Grade:
- -
- Qualification:
- -
LH1540AT-X016 FAQ
1.How can I place an order for LH1540AT-X016 through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1540AT-X016 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 LH1540AT-X016 reliable?
The price and inventory of LH1540AT-X016 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1540AT-X016 is usually 5 days.
3.What payment methods are accepted for LH1540AT-X016?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1540AT-X016 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1540AT-X016?
LH1540AT-X016 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1540AT-X016 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 LH1540AT-X016?
For technical support, including LH1540AT-X016 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1540AT-X016 requirements.
6.How does Aetrix verify that LH1540AT-X016 is sourced from the original manufacturer or authorized distributors?
All LH1540AT-X016 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 LH1540AT-X016 meets industry standards.
7.What is the process for return or replacement of LH1540AT-X016?
All LH1540AT-X016 units undergo pre-shipment inspection (PSI). If there is an issue with LH1540AT-X016, 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 LH1540AT-X016 part is unused and in its original packaging.
Return procedure for LH1540AT-X016:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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