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Vishay Semiconductor Opto Division LH1500AT
- Part No.:
- LH1500AT
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-DIP (0.300", 7.62mm)
- Datasheet:
-
LH1500AT.pdf
- Description:
- SSR RELAY SPST-NO 150MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:361
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Product details
Overview
LH1500AT from Vishay Semiconductors is a 1-Form-A solid-state relay (SSR) with optically isolated GaAlAs LED input and dual-MOSFET output, delivering 350 V load voltage, 140 mA AC/DC continuous load current, and 5300 VRMS isolation. It replaces electromechanical relays in telecom switching, ground fault detection, and industrial control systems requiring bounce-free, low-power switching.
For engineers reviewing the LH1500AT datasheet, LH1500AT pinout, LH1500AT application, or LH1500AT equivalent, key selection criteria include its DIP-6 package, 22 Ω typical on-resistance (AC/DC), 0.13 ms typical turn-on time, and UL/cUL/VDE safety certifications for reinforced insulation in safety-critical signal routing.
Technical Context
The LH1500AT integrates a GaAlAs infrared LED coupled to a high-voltage MOSFET output stage, enabling galvanic isolation between input control logic and AC/DC load circuits. Its internal architecture supports both AC and DC load configurations with distinct RON and IL ratings.
It meets DIN EN 60747-5-5 (VDE 0884-5) and UL 1577 requirements 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 power dissipation derated above 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - enables safe interface between low-voltage control circuitry and 350 V AC/DC loads under UL/cUL/VDE standards |
| Load Voltage Rating | 350 V - supports direct switching of telecom line voltages and industrial AC mains without external snubbers |
| Continuous Load Current | 140 mA (AC/DC) / 250 mA (DC only) - defines maximum steady-state load handling capability per configuration |
| On-Resistance | 22 Ω typical (AC/DC), 5.2 Ω typical (DC only) - determines I²R conduction loss and thermal rise at rated load |
| Turn-On/Off Time | 0.13 ms / 0.05 ms typical - ensures fast, deterministic switching for pulse-width modulated or digital control signals |
| Input Forward Current | 0.3–2 mA for turn-on - allows direct drive from microcontroller GPIOs without external current amplification |
| Off-State Leakage | <1 nA at ±100 V, 6 nA at ±350 V - guarantees minimal standby power loss and high reliability in high-impedance sensing paths |
Pinout & Package
DIP-6 package with 7.62 mm lead pitch, through-hole mounting, and UL/VDE-certified insulation thickness ≥0.4 mm. Pin 1 marked by notch or dot; leads coplanar ≤0.1 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED anode input | Connects to positive side of current-limited control source; requires series resistor for 5–10 mA drive |
| 2 (Cathode) | LED cathode input | Ground reference for input LED; defines logic-low activation threshold |
| 3 (NC) | No connect | Internally unconnected; must remain floating - no PCB trace or component attachment |
| 4 (Load +) | Output high-side terminal (DC only) | In DC-only mode, serves as load positive connection; ties to VLOAD |
| 5 (Load –) | Output low-side terminal (DC only) | In DC-only mode, serves as load return path; connects to system ground or negative rail |
| 6 (Load ±) | Bidirectional load terminal (AC/DC) | Common output node for AC/DC configuration; connects to one side of load, other side to AC line or DC rail |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Eliminates contact arcing and EMI in telecom line testing and security alarm triggering |
| High surge capability | Withstands repetitive 350 V transients without degradation, suitable for noisy industrial environments |
| Low power consumption | 0.3–2 mA LED drive enables battery-powered remote controllers and energy-harvesting nodes |
| Reinforced safety insulation | 5300 VRMS isolation and ≥7 mm creepage meet IEC 62368-1 and UL 62368-1 for primary-secondary separation |
| Wide temperature operation | –40 °C to +85 °C ambient range supports deployment in outdoor telecom cabinets and factory-floor PLCs |
Applications
| Telecom Line Switching | Ground Fault Detection Circuit |
|---|---|
|
Use Scenario: Isolating test equipment from live PSTN or VoIP line pairs during automated loopback and continuity checks. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated, bidirectional AC/DC load switching with sub-millisecond timing precision. Use Value: Prevents equipment damage from line surges while enabling repeatable, zero-bounce switching essential for compliance testing. |
Use Scenario: Monitoring insulation resistance between AC mains and chassis ground in medical or industrial power supplies. IC Role / Device Role / Timing Role: High-impedance, low-leakage switch isolating test voltage sources from sensitive measurement circuits. Use Value: Sub-1 nA off-state leakage ensures accurate high-resistance readings without measurement drift or false faults. |
| Security System Zone Control | Industrial PLC Output Module |
|
Use Scenario: Controlling 24 V DC sirens or door locks in fire alarm panels where mechanical relay wear causes field failures. IC Role / Device Role / Timing Role: DC-only configured SSR acting as fail-safe output driver with programmable on/off timing. Use Value: 5.2 Ω typical RON minimizes voltage drop across 250 mA loads, ensuring full actuator torque and reliable latching. |
Use Scenario: Driving 120/240 V AC solenoids and indicator lamps in modular control cabinets with mixed AC/DC loads. IC Role / Device Role / Timing Role: AC/DC configurable SSR serving as universal output stage with shared control logic. Use Value: Single-part flexibility reduces BOM count and simplifies inventory management across diverse OEM control platforms. |
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 | DIP-6, 400 V load rating, 120 mA AC/DC current, 3750 VRMS isolation | Lower voltage/current rating; suited for lower-power telecom interfaces but not 350 V line switching | Select VO3120 only when load requirements stay below 400 V and 120 mA, and 5300 VRMS isolation is not mandated. |
| IXYS CPC1976Y | SMD-6, 400 V load, 120 mA AC/DC, 5000 VRMS isolation, 0.15 ms ton | Surface-mount only; lacks DIP-6 through-hole option and has higher RON (30 Ω typical) | Choose CPC1976Y for space-constrained SMD designs where board real estate outweighs through-hole serviceability needs. |
Compared with VO3120 and CPC1976Y, the LH1500AT uniquely combines DIP-6 through-hole packaging, 5300 VRMS isolation, and dual-mode (AC/DC) load support - making it the only option among the three qualified for safety-critical telecom line isolation and industrial ground-fault monitoring where creepage, clearance, and certification rigor are non-negotiable.
Availability
LH1500AT is available at Aetrix Electronics and suitable for telecom line switching, ground fault detection, security zone control, and industrial PLC output modules requiring stable component supply, long-term lifecycle assurance, and certified safety isolation.
Supply support for LH1500AT 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 LH1500AT belongs to Vishay's optocoupler-based solid-state relay product line, engineered specifically for replacing electromechanical relays in safety-isolated, high-reliability signal and power routing applications across telecom, industrial, and security markets.
FAQ
What is the maximum continuous load current rating for LH1500AT in AC/DC configuration?
The LH1500AT supports 140 mA continuous load current in AC/DC configuration, verified per Vishay Document 83804 Section "Absolute Maximum Ratings". This rating applies at Tamb = 25 °C and derates linearly above that temperature, reaching ~90 mA at 85 °C ambient. Exceeding this value risks thermal runaway and reduced lifetime.
Does LH1500AT support both AC and DC load switching in the same physical package?
Yes, the LH1500AT supports two distinct configurations: AC/DC mode using pins 4 and 6 (load ±), and DC-only mode using pins 4 and 5 (load +/–). The internal MOSFET topology enables bidirectional conduction in AC/DC mode and unidirectional flow in DC-only mode - no external hardware change is needed beyond PCB layout routing.
What safety certifications does LH1500AT hold, and what do they enable?
The LH1500AT is certified to UL 1577 (5300 VRMS), cUL, DIN EN 60747-5-5 (VDE 0884-5), and FIMKO. These approvals validate its use as reinforced insulation in end equipment complying with IEC 62368-1 and UL 62368-1, permitting direct interface between SELV control circuits and hazardous voltage domains without additional barrier components.
Can LH1500AT be driven directly from a 3.3 V microcontroller GPIO without external circuitry?
Yes - the LH1500AT requires only 0.3–2 mA forward current for reliable turn-on, and its LED forward voltage is 1.4–1.6 V at 10 mA. A 3.3 V MCU GPIO can drive it directly using a 1 kΩ series resistor, delivering ~2.0 mA at 25 °C. No level-shifting or buffer stages are required for standard logic-level control.
How does the pinout of LH1500AT differ from LH1500AAB, and why does it matter for PCB design?
The LH1500AT uses DIP-6 packaging with 7.62 mm lead pitch and through-hole mounting, whereas LH1500AAB uses SMD-6 with 2.54 mm pitch and gull-wing leads. Their pin functions are identical (pin 1 = anode, pin 2 = cathode, etc.), but mechanical footprint, soldering profile, and board assembly process differ entirely - requiring separate PCB layouts and reflow/wave profiles.
LH1500AT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1500
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Through Hole
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.25VDC
- Voltage - Load:
- 0 V ~ 350 V
- Load Current:
- 150 mA
- On-State Resistance (Max):
- 20 Ohms
- Termination Style:
- PC Pin
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-DIP
- Approval Agency:
- cUR, DIN, FIMKO, UL
- Grade:
- -
- Qualification:
- -
LH1500AT FAQ
1.How can I place an order for LH1500AT through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1500AT 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 LH1500AT reliable?
The price and inventory of LH1500AT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1500AT is usually 5 days.
3.What payment methods are accepted for LH1500AT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1500AT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1500AT?
LH1500AT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1500AT 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 LH1500AT?
For technical support, including LH1500AT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1500AT requirements.
6.How does Aetrix verify that LH1500AT is sourced from the original manufacturer or authorized distributors?
All LH1500AT 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 LH1500AT meets industry standards.
7.What is the process for return or replacement of LH1500AT?
All LH1500AT units undergo pre-shipment inspection (PSI). If there is an issue with LH1500AT, 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 LH1500AT part is unused and in its original packaging.
Return procedure for LH1500AT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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