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Vishay Semiconductor Opto Division LH1529FPTR
- Part No.:
- LH1529FPTR
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SOP (0.180", 4.57mm Width)
- Datasheet:
-
LH1529FPTR.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:2,328
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Product details
Overview
LH1529FPTR from Vishay Semiconductors is a telecom switch solid-state relay (SSR) with integrated bidirectional optocoupler in a single 8-pin SMD flat pak package. It delivers 3000 VRMS input-output isolation, 20 Ω typical on-resistance, 350 V load voltage rating, and 120 mA continuous load current - enabling on/off hook control and ring detection in PCMCIA and notebook telecom interfaces.
For engineers reviewing the LH1529FPTR datasheet, LH1529FPTR pinout, LH1529FPTR application, or LH1529FPTR equivalent, key selection criteria include CTR ≥33 % at 6 mA, current-limit protection up to 250 mA, clean bounce-free switching, and RoHS-compliant surface-mount packaging for telecom line interface designs.
Technical Context
The LH1529FPTR integrates two independent functional blocks on one monolithic die: a high-voltage SSR switch with current-limit circuitry and a bidirectional optocoupler using anti-parallel GaAs LEDs. Its SSR operates with ±350 V load capability and exhibits <2.5 ms turn-on/turn-off times under 50 mA load conditions.
The optocoupler channel provides loop current sensing and ring detection via dual LED configuration, delivering minimum 33 % DC current transfer ratio at IF = 6 mA and VCE = 0.5 V, with dark current leakage ≤500 nA and saturation voltage ≤0.5 V at IC = 2 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 3000 VRMS - ensures safety and noise immunity between telephone line and logic-side circuits |
| SSR On-Resistance | 20 Ω typical - minimizes I²R loss and heating during sustained 120 mA load conduction |
| Load Voltage Rating | ±350 V - supports full-range analog telecom signaling including ringing and off-hook transients |
| CTR (DC) | ≥33 % at IF = 6 mA - guarantees reliable optocoupler output drive for low-power microcontroller inputs |
| Current Limit Threshold | 170–250 mA - protects SSR against lightning-induced surges without external fusing |
| Turn-on/Off Time | 1.3 ms / 0.1 ms typical - enables precise dial-pulse timing and fast hook-state transitions |
| Package | SMD-8 flat pak (0.080" thick) - supports automated assembly and meets IPC-7351B footprint standards |
Pinout & Package
Package: 8-pin plastic flat pak, surface-mount, 0.080" thickness, lead coplanarity ≤0.1 mm, 3°–7° lead angle.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SSR Input Anode/Cathode | Drive SSR switch via LED forward current (IFon ≤3 mA typical for turn-on) |
| 3, 4 | Optocoupler Bidirectional LED Terminals | Enable AC-coupled current sensing; polarity-insensitive ring/loop detection |
| 5, 6 | SSR Load Terminals (S, S′) | Switched telephone line path; rated for ±350 V, 120 mA, 20 Ω RON |
| 7, 8 | Optocoupler Output Collector/Emitter | Phototransistor output with CTR ≥33 %, VCEsat ≤0.5 V, ICEO ≤500 nA |
Key Features
| Feature | Design Value |
|---|---|
| Monolithic SSR + optocoupler integration | Eliminates inter-device timing skew and layout coupling in telecom line interface PCBs |
| Current-limit protection | Self-limiting SSR output prevents latch-up or destruction during lightning surge events on phone lines |
| Bounce-free switching | No mechanical contact wear or arcing - supports >10⁹ operations over lifetime in PCMCIA hot-swap cycles |
| Bidirectional optocoupler input | Single pair of pins senses both positive and negative loop current - simplifies ring-detection circuitry |
| RoHS-compliant SMD package | Enables lead-free reflow assembly per J-STD-020; UL and FIMKO certified for double protection |
Applications
| PCMCIA Modem Interface | On/Off-Hook Control |
|---|---|
Use Scenario: Isolated line control in laptop PCMCIA modem cards handling analog PSTN connection. IC Role / Device Role / Timing Role: LH1529FPTR acts as isolated switch driver and ring detector - managing hook state and detecting incoming call signals. Use Value: Replaces electromechanical relays with 20 Ω RON and <2.5 ms switching, reducing board space and improving reliability in portable systems. |
Use Scenario: Telecom equipment requiring galvanically isolated control of telephone line loop closure. IC Role / Device Role / Timing Role: LH1529FPTR SSR switches line loop; optocoupler monitors loop current to confirm hook state transition. Use Value: Achieves 3000 VRMS isolation and current-limit protection - eliminating need for external surge suppressors in Class B equipment. |
| Dial-Pulse Switching | Ring Current Detection |
Use Scenario: Pulse-dialing legacy telephony systems where precise timing of make/break intervals is required. IC Role / Device Role / Timing Role: LH1529FPTR SSR performs clean, bounce-free switching with 1.3 ms turn-on and 0.1 ms turn-off. Use Value: Enables accurate pulse generation compliant with ITU-T Q.23 specifications without contact degradation. |
Use Scenario: Detecting 20 Hz AC ring signal superimposed on DC loop current in analog telephone lines. IC Role / Device Role / Timing Role: LH1529FPTR optocoupler uses anti-parallel LEDs to sense bidirectional ring current without rectification. Use Value: Delivers ≥33 % CTR across temperature range - ensuring robust ring detection even at -40 °C ambient. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay LH1529GPTR | Higher CTR (min. 100 % vs. 33 %); identical SSR specs and pinout | Better noise margin in low-drive microcontroller systems; same isolation and surge protection | Select LH1529GPTR when higher optocoupler gain is needed for weak drive sources or noisy environments |
| Toshiba TLP3558 | Single-channel SSR only (no integrated optocoupler); 400 V load rating; 3750 VRMS isolation | Requires external ring detection circuit; suited for pure switching-only use cases | Choose TLP3558 only if optocoupler functionality is implemented separately and higher voltage margin is critical |
Compared with LH1529GPTR and TLP3558, the LH1529FPTR uniquely combines SSR switching and bidirectional optocoupling in one package at 33 % CTR - offering optimal cost and board-area efficiency for integrated telecom interface designs where moderate opto-gain suffices.
Availability
LH1529FPTR is available at Aetrix Electronics and suitable for PCMCIA modem interfaces, on/off-hook control systems, and dial-pulse switching applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant SMD packaging.
Supply support for LH1529FPTR 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, power efficiency, and high-voltage isolation.
The LH1529FPTR belongs to Vishay's telecom switch SSR family, designed specifically for analog telephone line interface applications requiring integrated switching, ring detection, and loop current sensing in compact SMD form factors.
FAQ
What is the isolation voltage rating of the LH1529FPTR?
The LH1529FPTR provides 3000 VRMS input-to-output isolation, verified per UL1577 and DIN EN 60747-5-2 standards. This rating applies across the full operating temperature range (-40 °C to +85 °C) and ensures safe separation between telephone line and logic-side circuitry in telecom applications.
Does the LH1529FPTR support bidirectional current sensing?
Yes, the LH1529FPTR includes an integrated bidirectional optocoupler with anti-parallel GaAs infrared LEDs on pins 3 and 4. This allows it to detect both positive and negative loop currents - essential for ring signal detection and polarity-insensitive line monitoring without external rectification.
What is the minimum CTR specification for the LH1529FPTR?
The LH1529FPTR has a minimum DC current transfer ratio (CTR) of 33 % at IF = 6 mA and VCE = 0.5 V. This value is guaranteed across the full operating temperature range and ensures sufficient phototransistor output current to drive standard logic-level inputs in telecom interface designs.
Can the LH1529FPTR replace mechanical relays in dial-pulse applications?
Yes, the LH1529FPTR is explicitly designed for dial-pulse switching with clean bounce-free operation, 1.3 ms turn-on time, and 0.1 ms turn-off time. Its monolithic SSR structure eliminates contact wear and supports >10⁹ operations - making it a direct, high-reliability replacement for electromechanical relays in pulse-dialing systems.
What package type does the LH1529FPTR use?
The LH1529FPTR uses an 8-pin plastic flat pak surface-mount package (SMD-8), 0.080" thick, with gull-wing leads and 2.54 mm pitch. It complies with IPC-7351B footprint standards and supports lead-free reflow soldering per J-STD-020.
LH1529FPTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1529
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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):
- 20 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SMD
- Approval Agency:
- BSI, FIMKO, UL
- Grade:
- -
- Qualification:
- -
LH1529FPTR FAQ
1.How can I place an order for LH1529FPTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1529FPTR 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 LH1529FPTR reliable?
The price and inventory of LH1529FPTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1529FPTR is usually 5 days.
3.What payment methods are accepted for LH1529FPTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1529FPTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1529FPTR?
LH1529FPTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1529FPTR 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 LH1529FPTR?
For technical support, including LH1529FPTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1529FPTR requirements.
6.How does Aetrix verify that LH1529FPTR is sourced from the original manufacturer or authorized distributors?
All LH1529FPTR 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 LH1529FPTR meets industry standards.
7.What is the process for return or replacement of LH1529FPTR?
All LH1529FPTR units undergo pre-shipment inspection (PSI). If there is an issue with LH1529FPTR, 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 LH1529FPTR part is unused and in its original packaging.
Return procedure for LH1529FPTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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