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Vishay Semiconductor Opto Division LH1546ADFTR
- Part No.:
- LH1546ADFTR
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 4-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1546ADFTR.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:1,695
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Product details
Overview
LH1546ADFTR from Vishay Semiconductors is a single-channel, normally open solid-state relay (SSR) in an SMD-4 package, integrating a GaAlAs LED input and MOSFET output stage. It delivers 350 V load voltage capability, 120 mA continuous bidirectional load current, and 22 Ω typical on-resistance - enabling electromechanical relay replacement in telecom switching, metering, and industrial control systems where bounce-free, low-power isolation is required.
For engineers reviewing the LH1546ADFTR datasheet, LH1546ADFTR pinout, LH1546ADFTR application, or LH1546ADFTR equivalent, this device offers verified 5300 VRMS isolation, sub-3 ms switching times, and UL/cUL/VDE safety certification - critical for high-reliability, space-constrained AC/DC load switching designs requiring galvanic separation and long-term reliability without contact wear.
Technical Context
The LH1546ADFTR implements optically isolated control via a GaAlAs infrared LED driving complementary MOSFETs to form a bidirectional, SPST Form A switch. Its output stage supports both AC and DC loads up to ±350 V with <1 nA off-state leakage at ±100 V and 6 nA at ±350 V.
It operates across –40 °C to +85 °C ambient, maintains ≤35 Ω on-resistance over temperature, and achieves 0.13 ms typical turn-on and 0.05 ms typical turn-off with 5 mA LED drive - optimized for low-power microcontroller interfacing and fast-response safety-critical switching.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - meets UL/cUL requirements for reinforced insulation in mains-connected equipment |
| Load Voltage Rating | 350 V - supports direct switching of 240 VAC RMS and 350 VDC industrial loads |
| Continuous Load Current | 120 mA - sufficient for driving solenoids, small relays, LED arrays, and sensor interface circuits |
| On-Resistance (RON) | 22 Ω typical - ensures <2.7 mW conduction loss at 120 mA, minimizing self-heating |
| Turn-On/Off Time | 0.13 ms / 0.05 ms typical - enables PWM-based dimming and fast fault isolation in test equipment |
| Input Forward Voltage | 1.4 V typical at 10 mA - compatible with 1.8 V–5 V logic outputs without external driver circuitry |
| Off-State Leakage | 6 nA at ±350 V - preserves signal integrity in high-impedance metering and instrumentation inputs |
Pinout & Package
SMD-4 surface-mount package (7.62 mm × 6.65 mm × 2.54 mm), JEDEC-compliant footprint with gull-wing leads, moisture sensitivity level 1, and Pb-free reflow profile compliant with J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Anode) | LED Input Anode | Connects to microcontroller GPIO or driver IC output; requires series resistor for 5–50 mA forward current |
| 2 (Cathode) | LED Input Cathode | Ground reference for input side; defines LED polarity and enables reverse-voltage protection |
| 3 (Source/Drain 1) | MOSFET Output Terminal 1 | Bidirectional AC/DC load connection point; electrically isolated from input by ≥8 mm creepage/clearance |
| 4 (Source/Drain 2) | MOSFET Output Terminal 2 | Second load terminal; forms SPST switch with Pin 3; no internal polarity - usable for AC or DC |
Key Features
| Feature | Design Value |
|---|---|
| Clean bounce-free switching | Zero mechanical contact arcing or chatter - eliminates EMI spikes and contact welding in cyclic applications |
| 5300 VRMS isolation rating | Enables safe operation between primary-side control logic and secondary-side 240 VAC mains circuits |
| Low 0.25 mA turn-on threshold | Permits direct drive from ultra-low-power MCUs (e.g., ARM Cortex-M0+) without buffer transistors |
| 600 mW output safety power | Supports sustained 120 mA @ 5 V or transient surges within IEC 60747-5-5 safety limits |
| 1 pF input-to-output capacitance | Minimizes high-frequency noise coupling - critical for precision analog signal path isolation |
Applications
| Telecom Line Switching | Metering Input Isolation |
|---|---|
|
Use Scenario: Remote activation of POTS line test circuits and DSLAM port selection in central office equipment. IC Role / Device Role / Timing Role: Solid-state relay isolating MCU-controlled test signals from live telephone lines. Use Value: Eliminates contact corrosion and timing jitter from electromechanical relays, ensuring repeatable 10⁶-cycle test accuracy. |
Use Scenario: Galvanically isolating utility meter current-sense shunt or CT inputs from microcontroller ADC subsystems. IC Role / Device Role / Timing Role: Bidirectional AC/DC switch enabling safe, zero-crossing–synchronized sampling of metering waveforms. Use Value: 6 nA off-state leakage prevents measurement drift; 350 V rating covers surge immunity per IEC 61000-4-5 Level 4. |
| Industrial PLC I/O Modules | Battery Management System (BMS) Safety Switching |
|
Use Scenario: Isolated digital output channel in DIN-rail mounted PLCs controlling 24 VDC solenoid valves and indicator lamps. IC Role / Device Role / Timing Role: Form A SSR replacing mechanical relays in 16-channel output modules with shared ground architecture. Use Value: 22 Ω RON ensures <60 mW dissipation at full load; SMD-4 footprint reduces PCB area by 70% vs. DIP-4 alternatives. |
Use Scenario: Isolating precharge/disconnect FET gate drivers from BMS controller during cell balancing and fault shutdown sequences. IC Role / Device Role / Timing Role: High-voltage, low-leakage switch enabling safe isolation of battery pack segments during thermal runaway events. Use Value: 8000 Vpeak transient isolation withstand protects MCU from arc-flash transients; UL/cUL listing satisfies functional safety audits. |
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 LH1546AEFTR | Higher 150 mA load current rating; same SMD-4 package and 350 V rating | Better suited for higher-current solenoid or heater control where >120 mA is required | Select LH1546AEFTR when peak load exceeds 120 mA but thermal design accommodates higher RON |
| IXYS CPC1976Y | 400 V load rating; 100 mA current; 35 Ω RON; different SMD-6 footprint | Used in higher-voltage industrial controls where 350 V margin is insufficient | Choose CPC1976Y only if 400 V rating is mandatory and PCB layout allows SMD-6 rework |
Compared with LH1546AEFTR and CPC1976Y, the LH1546ADFTR provides optimal balance of 350 V capability, 120 mA current, and compact SMD-4 footprint - making it preferred for space-constrained telecom and metering designs where exact 120 mA compliance and UL-certified 5300 VRMS isolation are required.
Availability
LH1546ADFTR is available at Aetrix Electronics and suitable for telecom switching, utility metering, and industrial PLC I/O modules requiring stable component supply, long-lifecycle support, and certified safety isolation.
Supply support for LH1546ADFTR 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 LH1546ADFTR belongs to Vishay's LH1546 family of optically coupled solid-state relays designed specifically for replacing electromechanical relays in high-isolation, low-power, and long-life industrial and instrumentation applications.
FAQ
What is the maximum load voltage the LH1546ADFTR can safely switch?
The LH1546ADFTR is rated for a maximum DC or peak AC load voltage of 350 V. This rating applies under normal operating conditions at ambient temperatures from –40 °C to +85 °C and is validated per UL, cUL, and DIN EN 60747-5-5 standards. Exceeding 350 V risks breakdown of the internal MOSFET output stage and violates safety isolation limits.
Does the LH1546ADFTR support AC load switching?
Yes, the LH1546ADFTR supports bidirectional AC and DC load switching due to its complementary MOSFET output configuration. Pins 3 and 4 form a symmetrical, polarity-agnostic switch capable of handling 240 VAC RMS with zero-crossing–compatible timing - confirmed by its 350 V peak AC rating and <1 nA off-state leakage at 100 VAC-equivalent bias.
What is the minimum LED forward current needed to turn on the LH1546ADFTR?
The LH1546ADFTR turns on with a typical LED forward current of 0.25 mA at 10 ms pulse width and 100 mA load current. The maximum guaranteed turn-on current is 2 mA, allowing direct interface with low-drive microcontrollers. This low threshold enables energy-efficient operation in battery-powered metering and IoT edge nodes.
Is the LH1546ADFTR RoHS and REACH compliant?
Yes, the LH1546ADFTR is RoHS-compliant (Pb-free terminations) and REACH-conformant, as documented in Vishay's material declarations (Doc. #99912). It meets JEDEC J-STD-020 moisture sensitivity level 1 and supports lead-free reflow profiles up to 260 °C peak, with unlimited floor life under <30 °C / <60 % RH storage.
How does the LH1546ADFTR achieve its 5300 VRMS isolation rating?
The LH1546ADFTR achieves 5300 VRMS isolation through a combination of internal physical construction - including ≥0.4 mm insulation thickness, ≥8 mm creepage and clearance distances, and proprietary molding compound - validated per UL1577 and DIN EN 60747-5-5. Every unit undergoes 100 % production testing at 1669 Vpeak (method B) with partial discharge <5 pC.
LH1546ADFTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1546
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A)
- Output Type:
- AC, DC
- Voltage - Input:
- 1.2VDC
- Voltage - Load:
- 0 V ~ 350 V
- Load Current:
- 120 mA
- On-State Resistance (Max):
- 28 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 4-SMD
- Approval Agency:
- BSI, cUL, FIMKO, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1546ADFTR FAQ
1.How can I place an order for LH1546ADFTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1546ADFTR 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 LH1546ADFTR reliable?
The price and inventory of LH1546ADFTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1546ADFTR is usually 5 days.
3.What payment methods are accepted for LH1546ADFTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1546ADFTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1546ADFTR?
LH1546ADFTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1546ADFTR 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 LH1546ADFTR?
For technical support, including LH1546ADFTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1546ADFTR requirements.
6.How does Aetrix verify that LH1546ADFTR is sourced from the original manufacturer or authorized distributors?
All LH1546ADFTR 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 LH1546ADFTR meets industry standards.
7.What is the process for return or replacement of LH1546ADFTR?
All LH1546ADFTR units undergo pre-shipment inspection (PSI). If there is an issue with LH1546ADFTR, 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 LH1546ADFTR part is unused and in its original packaging.
Return procedure for LH1546ADFTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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