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Vishay Semiconductor Opto Division LH1511BT
- Part No.:
- LH1511BT
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 6-DIP (0.300", 7.62mm)
- Datasheet:
-
LH1511BT.pdf
- Description:
- SSR RELAY SPST-NC 200MA 0-200V
- Quantity:
- Payment:
- Shipping:
Inventory:1,138
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Product details
Overview
LH1511BT from Vishay Semiconductors is a 1-Form-B solid-state relay (SSR) with DIP-6 package, featuring 3750 VRMS input-output isolation, 200 V load voltage rating, and typical on-resistance of 10 Ω for AC/DC operation - used in telecom switching, security equipment, and industrial control systems where bounce-free, low-power switching is required.
For engineers reviewing the LH1511BT datasheet, LH1511BT pinout, LH1511BT application, or LH1511BT equivalent, key selection criteria include isolation voltage compliance (UL/VDE), bidirectional DC load current capability (200 mA), turn-on/off timing (1.2–3 ms / 1–3 ms), and DIP-6 through-hole mounting compatibility with legacy relay footprints.
Technical Context
The LH1511BT integrates an infrared LED input stage coupled to a photodiode array driving dual MOSFET output switches, enabling normally closed (NC) SPST operation without mechanical contacts. Its hybrid multi-chip construction supports both AC/DC and DC-only load configurations.
Control logic is optically isolated; switching state is determined by LED forward current (0.2–0.9 mA for turn-on, 1–2 mA for turn-off). Output exhibits low capacitance (50 pF) and high off-resistance (0.1–1.4 GΩ), minimizing signal coupling and leakage in sensitive instrumentation interfaces.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 3750 VRMS - meets UL and VDE safety requirements for reinforced insulation in industrial and telecom end-equipment. |
| Load Voltage | 200 V - supports common AC mains-derived and high-voltage DC control rails without external snubbing. |
| On-Resistance (AC/DC) | 10 Ω typical - limits power dissipation to ≤550 mW at 200 mA, enabling direct drive of solenoids and indicator lamps. |
| Turn-on Time | 1.2–3 ms - ensures deterministic timing in programmable logic controller (PLC) I/O modules and automated test equipment. |
| Ambient Temp Range | −40 to +85 °C - validated for continuous operation in uncontrolled industrial enclosures and outdoor security housings. |
| Off-State Leakage | 0.07–1 μA at ±200 V - preserves signal integrity in high-impedance sensor multiplexing and analog measurement circuits. |
Pinout & Package
DIP-6 through-hole package with 2.54 mm pin pitch, 7.62 mm body width, and ISO Method A footprint; compliant with JEDEC MS-001 and RoHS lead-free reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode/Cathode | Optical input control: requires 0.2–0.9 mA IF for reliable turn-on; reverse voltage limited to 8 V. |
| 4, 6 | Output Source (+) | Common drain terminals of back-to-back MOSFETs; connect to positive side of load in NC configuration. |
| 5 | Output Drain (−) | Shared source terminal; connects to load return/ground; completes bidirectional conduction path. |
| 3 | No Connect | Internally unconnected; must remain floating per datasheet - no tie to ground or supply. |
Key Features
| Feature | Design Value |
|---|---|
| Bounce-free switching | Eliminates contact arcing and EMI in high-cycle counting applications such as metering and pulse generation. |
| Clean DC/AC operation | Back-to-back MOSFET topology enables zero-crossing–independent switching for resistive, inductive, and capacitive loads. |
| Low power consumption | LED drive current as low as 0.2 mA reduces MCU GPIO loading and eliminates need for external driver transistors. |
| UL & VDE certified | Validated isolation barrier allows use in safety-critical subsystems without additional system-level certification effort. |
Applications
| Telecom Line Switching | Security Panel Zone Control |
|---|---|
Use Scenario: Routing analog voice signals between PSTN lines and internal codec paths in VoIP gateways and PBX systems. IC Role / Device Role / Timing Role: Solid-state replacement for electromechanical relays in signal path switching, providing silent, wear-free operation. Use Value: 3750 VRMS isolation prevents ground loop noise and meets telecom surge immunity standards (GR-1089). | Use Scenario: Isolating and enabling/disabling sensor zones (PIR, door contacts) in alarm control panels with shared bus architecture. IC Role / Device Role / Timing Role: NC SSR acting as fail-safe zone enable switch; opens circuit upon fault or power loss. Use Value: 200 mA bidirectional DC current rating supports multiple wired sensors per zone without external buffering. |
| Industrial PLC I/O Module | Test Equipment Signal Routing |
Use Scenario: Driving 24 V DC solenoid valves and indicator lamps in modular PLC output cards requiring long service life. IC Role / Device Role / Timing Role: Load-switching element in isolated digital output stage, controlled via microcontroller GPIO. Use Value: 10 Ω RON ensures ≤500 mW dissipation at full 200 mA load, eliminating heatsinking in dense I/O packaging. | Use Scenario: Multiplexing calibration reference signals between DMMs, oscilloscopes, and signal generators in automated test racks. IC Role / Device Role / Timing Role: Low-leakage, low-capacitance switch isolating high-impedance references from channel crosstalk. Use Value: 50 pF output capacitance and <1 μA off-state leakage preserve nanovolt-level accuracy in precision metrology paths. |
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 LH1511BAB | SMD-6 gull-wing package; identical electrical specs but surface-mount footprint. | Requires PCB redesign for SMT assembly; not drop-in compatible with LH1511BT's DIP-6 through-hole layout. | Select LH1511BAB only when migrating to automated SMT production and board space constraints prohibit DIP components. |
| IXYS LAA110L | 1-Form-A (NO) configuration; 400 V load rating; higher RON (15 Ω typical); same 3750 VRMS isolation. | Not functionally interchangeable due to opposite default state (normally open vs. normally closed). | Choose LAA110L only when circuit design requires fail-open behavior and higher voltage margin outweighs NC functionality. |
Compared with LH1511BAB and LAA110L, the LH1511BT uniquely provides NC operation in a DIP-6 package with optimized 10 Ω RON for low-loss 200 V/200 mA loads - making it the only choice for retrofitting legacy electromechanical relay sockets while maintaining fail-safe shutdown behavior.
Availability
LH1511BT is available at Aetrix Electronics and suitable for telecom line switching, security panel zone control, and industrial PLC I/O modules requiring stable component supply across extended product lifecycles.
Supply support for LH1511BT 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 passive elements with emphasis on reliability and high-performance analog solutions.
The LH1511BT belongs to Vishay's optocoupler-based solid-state relay product line, engineered specifically to replace electromechanical relays in industrial, telecom, and security applications demanding long life, low EMI, and regulatory-compliant isolation.
FAQ
What is the default switching state of the LH1511BT?
The LH1511BT is a normally closed (Form B) solid-state relay: the output conducts (pins 4/6 to 5) when the input LED is unpowered. Applying ≥0.2 mA forward current to pins 1–2 opens the output path. This fail-safe behavior ensures continuity during controller faults or power loss - critical in security and safety-critical systems where LH1511BT is deployed.
Can the LH1511BT switch AC loads?
Yes, the LH1511BT supports both AC and DC loads up to 200 V peak. Its back-to-back MOSFET output stage enables bidirectional conduction without zero-crossing detection, allowing clean switching of resistive, inductive, and capacitive AC loads - unlike single-MOSFET SSRs. This capability is explicitly verified in the LH1511BT datasheet under "AC/DC operation" and confirmed by its 200 V VL rating and 200 mA bidirectional IL specification.
What is the maximum continuous load current rating for the LH1511BT?
The LH1511BT supports 200 mA continuous bidirectional DC load current and 300 mA unidirectional DC load current, as specified in its Absolute Maximum Ratings table. Derating applies above +60 °C ambient; Fig. 1 in the datasheet shows linear reduction to ~120 mA at +85 °C. These values are measured with proper PCB copper area and airflow - exceeding them risks thermal runaway and permanent damage to the LH1511BT.
Does the LH1511BT require a series current-limiting resistor on the LED input?
Yes, a series resistor is mandatory to limit LED forward current to ≤50 mA absolute maximum and maintain typical operation within 0.2–2 mA. For a 3.3 V MCU GPIO, a 2.2 kΩ resistor sets IF ≈ 1.5 mA - satisfying turn-on threshold while staying well below max ratings. Omitting this resistor will destroy the LH1511BT's input LED within milliseconds, as confirmed by the Absolute Maximum Ratings section of the LH1511BT datasheet.
Is pin 3 of the LH1511BT internally connected?
No, pin 3 of the LH1511BT is a no-connect (NC) terminal with no internal bond wire or circuit connection. The datasheet explicitly states "Pin 3: No Connect" and warns against tying it to ground, supply, or any other node. Leaving pin 3 floating is required for correct LH1511BT operation and reliability - connecting it may cause unpredictable behavior or accelerated degradation due to parasitic coupling.
LH1511BT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1511
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Through Hole
- Circuit:
- SPST-NC (1 Form B)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.26VDC
- Voltage - Load:
- 0 V ~ 200 V
- Load Current:
- 200 mA
- On-State Resistance (Max):
- 10 Ohms
- Termination Style:
- PC Pin
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 6-DIP
- Approval Agency:
- UL, VDE
- Grade:
- -
- Qualification:
- -
LH1511BT FAQ
1.How can I place an order for LH1511BT through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1511BT 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 LH1511BT reliable?
The price and inventory of LH1511BT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1511BT is usually 5 days.
3.What payment methods are accepted for LH1511BT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1511BT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1511BT?
LH1511BT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1511BT 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 LH1511BT?
For technical support, including LH1511BT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1511BT requirements.
6.How does Aetrix verify that LH1511BT is sourced from the original manufacturer or authorized distributors?
All LH1511BT 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 LH1511BT meets industry standards.
7.What is the process for return or replacement of LH1511BT?
All LH1511BT units undergo pre-shipment inspection (PSI). If there is an issue with LH1511BT, 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 LH1511BT part is unused and in its original packaging.
Return procedure for LH1511BT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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