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Vishay Semiconductor Opto Division LH1502BACTR
- Part No.:
- LH1502BACTR
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1502BACTR.pdf
- Description:
- RELAY SPST-NO/NC 150MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:3,279
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Product details
Overview
LH1502BACTR from Vishay Semiconductors is a dual 1 Form A/B, C solid-state relay in SMD-8 package, integrating infrared LED actuation with photodiode-driven MOSFET output switches. It provides independent normally open (NO) and normally closed (NC) channels, 350 V load voltage rating, 150 mA continuous load current, and 20 Ω typical on-resistance for telecom and industrial control switching.
For engineers reviewing the LH1502BACTR datasheet, LH1502BACTR pinout, LH1502BACTR application, or LH1502BACTR equivalent, key selection criteria include isolation voltage (3750 VRMS), bounce-free switching behavior, current-limit protection, and SMD tape-and-reel packaging compatibility with automated assembly.
Technical Context
The LH1502BACTR implements optically isolated control via an internal IR LED coupled to a photodiode array that drives complementary MOSFETs for NO and NC outputs. Its hybrid multi-chip construction enables simultaneous form A and form B operation or coordinated form C (SPDT) switching without mechanical contacts.
It delivers clean, zero-crossing–free switching with turn-on times as low as 0.2 ms (typ.) for both NO and NC paths, and incorporates built-in current-limit circuitry that activates at ~290 mA to protect against transient overloads while maintaining stable RON across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 3750 VRMS - Enables safe interface between low-voltage logic and 350 V AC/DC loads in telecom and industrial systems. |
| Load Voltage Rating | 350 V - Supports direct switching of standard POTS line voltages and industrial AC control signals. |
| Continuous Load Current | 150 mA - Sufficient for driving relays, solenoids, small indicators, and telecom interface circuits. |
| Typical On-Resistance | 20 Ω - Ensures low conduction loss and minimal self-heating under full-load conditions. |
| Turn-On Time (NO/NC) | 0.2–3.8 ms (typ.) - Enables precise timing-critical switching in dial pulse generation and ring delay applications. |
| Off-State Leakage | <1 μA (NO/NC) - Guarantees high signal integrity and low standby power in always-on instrumentation circuits. |
| Current Limit Threshold | 290 mA (typ.) - Provides robust short-circuit protection without external components in field-deployed equipment. |
Pinout & Package
SMD-8 surface-mount package with gull-wing leads; RoHS-compliant, lead-free reflow compatible per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode | Optical input path; requires 0.6–2 mA forward current to activate NO switch; 0.4–2 mA to deactivate NC switch. |
| 3, 4 | NO Output Source / Drain | Normally open channel; conducts when LED is energized; rated for 350 V, 150 mA, 20 Ω RON. |
| 5, 6 | NC Output Source / Drain | Normally closed channel; opens when LED is energized; maintains continuity until actuated. |
| 7, 8 | Common / Return | Shared output reference node; connects to load return path for both NO and NC channels in form C configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Eliminates contact arcing and signal chatter in telecom hook-switch emulation and ground-start circuits. |
| Integrated current limit protection | Self-protecting operation up to 350 mA peak (form B), removing need for external fusing or current-sense circuitry. |
| 3750 VRMS input-to-output isolation | Meets UL, VDE, CQC, and FIMKO safety standards for reinforced insulation in mains-connected telecom infrastructure. |
| Low power LED drive | Switch activation at ≤2 mA enables direct microcontroller GPIO control without buffer stages. |
| SMD-8 tape-and-reel packaging | Supports high-volume automated placement with JEDEC-standard footprint and coplanarity ≤0.1 mm. |
Applications
| Telecom Line Interface | Industrial Signal Routing |
|---|---|
|
Use Scenario: Implementing on-hook/off-hook detection and ring delay in analog telephone line cards. IC Role / Device Role / Timing Role: Solid-state relay providing galvanically isolated SPDT switching between line feed and ground-return paths. Use Value: Eliminates mechanical relay wear and acoustic noise while supporting >10⁶ operations under 350 V line transients. |
Use Scenario: Routing sensor excitation signals or PLC I/O lines in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-path isolation switch enabling safe hot-swap of field wiring without system shutdown. Use Value: 150 mA load capacity and 20 Ω RON ensure minimal voltage drop across switched 24 V DC control loops. |
| Instrumentation Multiplexing | Test Equipment Switching |
|
Use Scenario: Selecting between calibration references or sensor inputs in portable multimeters and data loggers. IC Role / Device Role / Timing Role: Low-leakage (<1 μA), low-capacitance (50 pF) SPDT switch preserving signal fidelity in µV-level measurements. Use Value: Sub-millisecond switching and negligible off-state loading prevent measurement drift during channel scanning. |
Use Scenario: Configuring signal paths in automated test equipment (ATE) for functional validation of telecom modules. IC Role / Device Role / Timing Role: High-isolation (3750 VRMS), fast-turning relay enabling safe switching between DUT power domains and measurement instruments. Use Value: Dual NO/NC topology allows fail-safe test sequencing where one path remains active during reconfiguration. |
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 LH1502BB | DIP-8 through-hole package; identical electrical specs but incompatible with SMT assembly. | Used in prototyping, low-volume industrial controls, or legacy board designs requiring through-hole mounting. | Select LH1502BB only when manual soldering or socket-based testing is required; not suitable for automated production. |
| Toshiba TLP3558A | Single-pole, normally open SSR; 400 V load rating, 120 mA current, no NC channel; 1500 VRMS isolation. | Applicable where only NO switching is needed and lower isolation suffices; lacks form C functionality. | Choose TLP3558A for cost-sensitive single-channel applications with less stringent isolation requirements; cannot replace LH1502BACTR in SPDT designs. |
Compared with LH1502BB and TLP3558A, the LH1502BACTR uniquely combines SMD-8 manufacturability, dual NO/NC topology, 3750 VRMS isolation, and integrated current limiting-making it the only option for high-reliability, automated telecom line card production requiring true form C operation.
Availability
LH1502BACTR is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLC I/O modules, instrumentation multiplexers, and automated test equipment requiring stable component supply and long-term lifecycle support.
Supply support for LH1502BACTR 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 and high-performance analog solutions.
The LH1502BACTR belongs to Vishay's LH-series solid-state relay family, engineered specifically for replacing electromechanical relays in telecom switching, instrumentation, and industrial control where long life, silent operation, and high isolation are critical.
FAQ
What is the maximum ambient operating temperature for the LH1502BACTR?
The LH1502BACTR supports continuous operation from -40 °C to +85 °C. At 85 °C, its maximum load current derates to approximately 90 mA for form A and 60 mA for form B, as shown in Figure 1 of the Vishay datasheet (Doc. #83806). This thermal performance ensures reliable use in enclosed telecom cabinets and industrial enclosures without forced cooling.
Does the LH1502BACTR require an external current-limiting resistor on the LED side?
Yes, the LH1502BACTR requires an external series resistor to limit LED forward current to ≤2 mA for reliable NO turn-on and ≤2 mA for NC turn-off, based on its specified IFon/IFoff ranges. With VF = 1.26 V (typ.) at 10 mA, a 1 kΩ resistor is typical for 3.3 V GPIO drive; exact value depends on supply voltage and desired switching speed.
Can the LH1502BACTR be used as a true SPDT (form C) switch?
Yes, the LH1502BACTR is explicitly designed as a dual 1 Form A/B, C solid-state relay. Pins 3–4 constitute the NO path, pins 5–6 the NC path, and pins 7–8 serve as the common node. When wired correctly, it functions as a break-before-make SPDT switch with guaranteed isolation between poles, validated per Vishay's application notes and absolute maximum ratings.
What is the off-state leakage current specification for the LH1502BACTR?
The LH1502BACTR specifies off-state leakage current as ≤1000 nA for the NO channel and ≤1 μA for the NC channel at ±100 V, with a worst-case limit of ≤1 μA for both at ±200 V. These values are measured with specified LED bias conditions (IF = 0 mA for NO, IF = 5 mA for NC) and ensure minimal signal corruption in high-impedance instrumentation paths.
Is the LH1502BACTR compliant with RoHS and REACH regulations?
Yes, the LH1502BACTR is RoHS-compliant (per Vishay Doc. #99912) and REACH-conformant. Its SMD-8 package uses lead-free terminations, and material declarations confirm absence of SVHC substances above threshold limits. Compliance documentation is available via Vishay's product portal using document number 83806.
LH1502BACTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1502
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO + SPST-NC (1 Form A and B)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.26VDC
- Voltage - Load:
- 0 V ~ 350 V
- Load Current:
- 150 mA
- On-State Resistance (Max):
- 20 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SMD
- Approval Agency:
- CQC, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1502BACTR FAQ
1.How can I place an order for LH1502BACTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1502BACTR 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 LH1502BACTR reliable?
The price and inventory of LH1502BACTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1502BACTR is usually 5 days.
3.What payment methods are accepted for LH1502BACTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1502BACTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1502BACTR?
LH1502BACTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1502BACTR 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 LH1502BACTR?
For technical support, including LH1502BACTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1502BACTR requirements.
6.How does Aetrix verify that LH1502BACTR is sourced from the original manufacturer or authorized distributors?
All LH1502BACTR 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 LH1502BACTR meets industry standards.
7.What is the process for return or replacement of LH1502BACTR?
All LH1502BACTR units undergo pre-shipment inspection (PSI). If there is an issue with LH1502BACTR, 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 LH1502BACTR part is unused and in its original packaging.
Return procedure for LH1502BACTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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