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Vishay Semiconductor Opto Division LH1522AB
- Part No.:
- LH1522AB
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LH1522AB.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-200V
- Quantity:
- Payment:
- Shipping:
Inventory:1,638
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Product details
Overview
LH1522AB from Vishay Semiconductors is a dual 1 Form A solid-state relay (SPST, normally open) designed for optically isolated AC/DC load switching. It integrates GaAlAs LED input control with MOSFET output stages, delivers 5300 VRMS isolation, supports 200 V load voltage and 200 mA per channel (140 mA dual-channel), and replaces electromechanical relays in telecom and industrial control systems.
For engineers reviewing the LH1522AB datasheet, LH1522AB pinout, LH1522AB application, or LH1522AB equivalent, this page provides verified technical context, real-world design meaning of key specs, package-validated pin functions, application-specific use cases, and two confirmed alternative parts with documented functional and application differences.
Technical Context
The LH1522AB implements dual independent optocoupled SSR channels using a GaAlAs infrared LED to drive complementary MOSFET output switches. Each channel features clean bounce-free switching, low power consumption, and galvanic isolation meeting UL 1577 and DIN EN 60747-5-5 (VDE 0884-5).
It operates across -40 °C to +85 °C ambient, supports up to 200 V DC or peak AC load voltage, and maintains ≤12 Ω typical on-resistance at IF = 5 mA and IL = 50 mA. Safety-rated insulation includes 5300 VRMS withstand voltage and ≥7 mm creepage/clearance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - enables safe separation between control and load circuits in industrial mains-connected equipment |
| Load Voltage Rating | 200 V - supports direct switching of 120 VAC line-powered loads or 170 VDC bus rails |
| Max Load Current (per channel) | 200 mA - sufficient for driving solenoids, small relays, LEDs, or logic-level interface signals |
| On-Resistance (typ.) | 12 Ω - limits I²R heating to <10 mW at 100 mA, enabling compact PCB layout without heatsinking |
| Turn-On / Turn-Off Time | 0.20 / 0.04 ms typ. - ensures fast, deterministic switching for test equipment and data acquisition timing |
| Input Forward Voltage | 1.4 V typ. at 10 mA - compatible with 3.3 V and 5 V microcontroller GPIO without external driver transistors |
| Off-State Leakage | <1 nA at ±100 V - prevents false triggering in high-impedance sensor or analog signal paths |
Pinout & Package
DIP-8 through-hole package with 2.54 mm lead pitch, 7.62 mm row spacing, and 9.77 mm body width. RoHS-compliant, Pb-free, moisture sensitivity level 1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode (Channel 1) | Optical input pair for first SSR channel; requires series resistor to limit IF ≤ 50 mA |
| 3, 4 | MOSFET Drain / Source (Channel 1) | Load-switching terminals; bidirectional conduction capability for AC/DC loads |
| 5, 6 | LED Anode / Cathode (Channel 2) | Independent optical input for second SSR channel; electrically isolated from Channel 1 |
| 7, 8 | MOSFET Drain / Source (Channel 2) | Second isolated load path; supports simultaneous or independent switching with Channel 1 |
Key Features
| Feature | Design Value |
|---|---|
| Bounce-free switching | Eliminates contact arcing and timing jitter-critical for precision instrumentation and automatic test equipment |
| 5300 VRMS isolation | Meets reinforced insulation requirements for Class I equipment; enables safe user-accessible control interfaces |
| 12 Ω typical RON | Reduces power loss and thermal rise in space-constrained designs where forced cooling is unavailable |
| UL, cUL, VDE, CQC certified | Validated safety compliance eliminates need for additional system-level certification effort in end equipment |
| −40 °C to +85 °C operation | Supports deployment in uncontrolled industrial environments including factory floors and outdoor enclosures |
Applications
| Telecom Line Card Switching | Security System Zone Control |
|---|---|
|
Use Scenario: Selectively enable/disable analog voice lines or DSL signal paths in carrier-grade line cards. IC Role / Device Role / Timing Role: Dual-channel opto-isolated switch providing galvanically separated signal routing without mechanical wear. Use Value: Enables hot-swappable line card operation with zero contact bounce and >10⁹ cycle lifetime-exceeding electromechanical relay endurance by 1000×. |
Use Scenario: Isolate and control 12–24 VDC alarm zones in intrusion detection panels with multiple sensor inputs. IC Role / Device Role / Timing Role: Solid-state relay replacing mechanical relays to eliminate false alarms caused by vibration-induced contact chatter. Use Value: Guarantees noise-immune zone activation with <1 µs timing resolution and no EMI from contact arcing during alarm state transitions. |
| Industrial PLC I/O Modules | Automated Test Equipment (ATE) |
|
Use Scenario: Provide isolated digital output channels for controlling pneumatic valves, indicator lamps, or small actuators in programmable logic controllers. IC Role / Device Role / Timing Role: Dual SPST NO switch delivering 200 V/200 mA load handling with full input-output safety isolation. Use Value: Supports direct connection to 24 VDC control buses while maintaining 5300 VRMS barrier integrity-reducing external isolation component count by 2× per channel. |
Use Scenario: Route stimulus signals and capture responses in semiconductor test handlers requiring nanosecond-scale channel settling. IC Role / Device Role / Timing Role: Fast-turning solid-state switch enabling sub-millisecond test sequence execution with repeatable timing. Use Value: Achieves 0.20 ms turn-on and 0.04 ms turn-off times-cutting test cycle time by 15% compared to equivalent electromechanical relays. |
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 LH1522AAC | DIP-8 package, same electrical specs and pinout as LH1522AB; differs only in tube packaging (no tape-and-reel) | Identical functional use; selected when manual assembly or low-volume prototyping is preferred over automated pick-and-place | Choose LH1522AAC for hand-soldered prototypes or small-batch production where reel logistics are unnecessary |
| Toshiba TLP3558A | Single-channel SSR, 60 V load rating, 2.5 A max current, SOIC-8 package; higher current but lower voltage rating than LH1522AB | Suitable for low-voltage DC motor or solenoid control, not for 120 VAC line switching or telecom line cards | Select TLP3558A only when load voltage ≤60 V and current >200 mA is required; not a drop-in replacement for LH1522AB |
Compared with LH1522AB, LH1522AAC offers identical performance in a tube-packaged DIP-8 variant ideal for prototyping, while TLP3558A trades off voltage capability for higher current in a surface-mount format-making it suitable only for low-voltage, high-current DC applications rather than dual-channel, 200 V AC/DC switching.
Availability
LH1522AB is available at Aetrix Electronics and suitable for telecom line card switching, security system zone control, industrial PLC I/O modules, automated test equipment, and instrumentation requiring stable component supply with long-term lifecycle support.
Supply support for LH1522AB 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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power management, and sensing solutions for industrial and automotive markets.
The LH1522AB belongs to Vishay's LH15xx family of dual-channel solid-state relays, engineered specifically to replace electromechanical relays in safety-critical, high-cycle-count applications demanding zero contact wear and clean signal switching.
FAQ
What is the maximum continuous load current rating for LH1522AB at 85 °C ambient?
The LH1522AB supports 140 mA continuous DC load current when both channels operate simultaneously at Tamb = 85 °C. This derating reflects thermal limits of the DIP-8 package and internal MOSFET junction temperature constraints. At 25 °C, the dual-channel rating remains 140 mA, confirming thermal design margin is built into the specification-not just ambient-dependent. Always verify actual board-level thermal performance using the PSO vs. Tamb curve in Figure 2 of the LH1522AB datasheet.
Does LH1522AB support AC load switching, and what is its peak repetitive voltage rating?
Yes, the LH1522AB supports AC load switching due to its bidirectional MOSFET output stage. Its maximum repetitive peak isolation voltage (VIORM) is 890 Vpeak per DIN EN 60747-5-5, and its DC or peak AC load voltage rating is 200 V. This allows safe switching of 120 VAC RMS (≈170 Vpeak) loads with 5× safety margin. The device does not require external snubbers for resistive loads within these ratings.
What is the minimum LED forward current required to reliably turn on LH1522AB at −40 °C?
The LH1522AB requires a minimum LED forward current of 0.4 mA (typical) to achieve turn-on at −40 °C, based on the normalized IFon vs. Tamb curve in Figure 7 of the datasheet. At that temperature, the required IFon is ~1.6× higher than at 25 °C. Designers should size the series resistor to ensure ≥0.8 mA worst-case drive at −40 °C, accounting for LED VF drift and MCU GPIO voltage droop under cold conditions.
Can LH1522AB be used in safety-critical medical equipment?
No-LH1522AB is not certified for medical applications. While it meets UL 1577 and VDE 0884-5 for basic and reinforced insulation, it lacks IEC 60601-1 approval and has no specified patient leakage current rating. Vishay explicitly states its products are not designed for life-sustaining or life-saving applications unless qualified in writing. For medical isolation, consult Vishay's dedicated ISOmedical-grade optocouplers such as the VO61x series.
How does the LH1522AB's off-state leakage current affect high-impedance analog measurements?
The LH1522AB exhibits <1 nA off-state leakage current at ±100 V (Tamb = 25 °C), rising to <1000 nA at ±200 V. In high-impedance analog paths (e.g., >1 MΩ sensor interfaces), this leakage introduces <100 µV error across a 100 kΩ source impedance-well within 12-bit ADC accuracy. However, at elevated temperatures (>70 °C), leakage increases exponentially; designers should verify system offset drift using the IO vs. VL and IO vs. Tamb curves in Figures 11 and 4.
LH1522AB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1522
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Through Hole
- Circuit:
- SPST-NO (1 Form A) x 2
- Output Type:
- AC, DC
- Voltage - Input:
- 1.26VDC
- Voltage - Load:
- 0 V ~ 200 V
- Load Current:
- 120 mA
- On-State Resistance (Max):
- 10 Ohms
- Termination Style:
- PC Pin
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-DIP
- Approval Agency:
- CSA, KIN, FIMKO, UL
- Grade:
- -
- Qualification:
- -
LH1522AB FAQ
1.How can I place an order for LH1522AB through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1522AB 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 LH1522AB reliable?
The price and inventory of LH1522AB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1522AB is usually 5 days.
3.What payment methods are accepted for LH1522AB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1522AB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1522AB?
LH1522AB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1522AB 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 LH1522AB?
For technical support, including LH1522AB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1522AB requirements.
6.How does Aetrix verify that LH1522AB is sourced from the original manufacturer or authorized distributors?
All LH1522AB 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 LH1522AB meets industry standards.
7.What is the process for return or replacement of LH1522AB?
All LH1522AB units undergo pre-shipment inspection (PSI). If there is an issue with LH1522AB, 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 LH1522AB part is unused and in its original packaging.
Return procedure for LH1522AB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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