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Vishay Semiconductor Opto Division LH1529GP
- Part No.:
- LH1529GP
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SOP (0.180", 4.57mm Width)
- Datasheet:
-
LH1529GP.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:3,698
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Product details
Overview
LH1529GP from Vishay Semiconductors is an optically coupled telecom switch integrating a solid-state relay (SSR) and a bidirectional input optocoupler in a single SMD-8 flat pak package. It delivers 3000 VRMS isolation, supports ±350 V load voltage and 120 mA continuous load current, and features a minimum CTR of 100 % at 6 mA - enabling reliable ring detection and loop current sensing in telephone line interfaces.
For engineers reviewing the LH1529GP datasheet, LH1529GP pinout, LH1529GP application, or LH1529GP equivalent, this device is selected for on/off hook control, dial-pulse switching, and surge-protected current sensing where high CTR, clean bounce-free SSR switching, and monolithic high-voltage integration are required.
Technical Context
The LH1529GP integrates two independent optically isolated functional blocks on one die: a high-voltage SSR with current-limit protection and a bidirectional GaAs LED phototransistor channel. Its SSR uses monolithic high-voltage technology to achieve 350 V breakdown and 20 Ω typical RON, while the optocoupler provides bidirectional current sensing via anti-parallel LEDs and guarantees ≥100 % CTR at 6 mA.
Both channels share 3000 VRMS input-to-output isolation per UL1577 and DIN EN 60747-5-2, operate across –40 °C to +85 °C ambient, and are RoHS-compliant. The SSR's turn-on time is 1.3 ms min., turn-off time is 0.1 ms min., and off-state leakage remains ≤1 μA at ±350 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 3000 VRMS - meets safety requirements for telecom line interface insulation and user protection. |
| SSR Load Voltage | ±350 V - supports full-range analog telephone line signaling including ringing and loop closure. |
| SSR Continuous Load Current | 120 mA - sufficient for driving standard telephone line relays and hook-switch loads. |
| Optocoupler CTR (min) | 100 % at 6 mA - ensures robust ring detection and loop sensing without external gain stages. |
| SSR On-Resistance | 20 Ω typical - minimizes I²R loss and voltage drop during active line switching. |
| Turn-off Time | 0.1 ms min. - enables fast, bounce-free disconnection critical for pulse-dialing accuracy. |
| Ambient Temp Range | –40 °C to +85 °C - validated for industrial-grade telecom equipment operation. |
Pinout & Package
Package: SMD-8 plastic flat pak, 0.080" thick, lead coplanarity ≤0.1 mm, 3°–7° lead angle, ISO Method A marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SSR Input Anode/Cathode | Bidirectional SSR control terminals - accept either polarity for hook/dial switching. |
| 3, 4 | Optocoupler LED Anode/Cathode | Anti-parallel GaAs LEDs - enable bidirectional current sensing for ring/loop detection. |
| 5, 6 | SSR Output Source/Drain | High-voltage SSR output path - rated for ±350 V, 120 mA, with current-limit protection. |
| 7, 8 | Optocoupler Phototransistor C/E | Output collector/emitter - delivers CTR ≥100 % at 6 mA input for low-noise sensing. |
Key Features
| Feature | Design Value |
|---|---|
| Solid-state relay + optocoupler integration | Single-package solution eliminates inter-channel timing skew and layout coupling in telecom line cards. |
| Monolithic SSR with current limit | Integrated 170–250 mA current limit protects against lightning-induced surges without external components. |
| Bidirectional optocoupler input | Anti-parallel GaAs LEDs allow detection of AC ring signals and DC loop current in both directions. |
| High CTR (≥100 %) | Eliminates need for secondary amplification in ring detect circuits, reducing BOM count and noise sensitivity. |
| Clean bounce-free switching | Sub-millisecond turn-off (0.1 ms min.) prevents false pulse generation during hook transitions. |
Applications
| Telephone Line Hook Control | Dial-Pulse Switching |
|---|---|
Use Scenario: Controlling on-hook/off-hook state in VoIP gateways and analog telephone adapters. IC Role / Device Role / Timing Role: LH1529GP acts as isolated line switch - its SSR replaces electromechanical relays to eliminate contact wear and acoustic noise. Use Value: 20 Ω RON and 120 mA rating ensure minimal voltage drop and reliable loop closure under varying line impedances. |
Use Scenario: Generating precise mechanical-dial-emulating pulses in legacy PBX interfaces. IC Role / Device Role / Timing Role: LH1529GP SSR provides fast, jitter-free make/break switching with <0.1 ms turn-off to meet ITU-T Q.23 pulse timing. Use Value: Bounce-free operation avoids multiple pulse registration; current-limit circuit prevents damage during shorted-pulse conditions. |
| Ringing Signal Detection | Loop Current Monitoring |
Use Scenario: Detecting 20 Hz–25 Hz AC ringing voltage (70–90 V RMS) on POTS lines. IC Role / Device Role / Timing Role: LH1529GP optocoupler channel senses bidirectional ring current via anti-parallel LEDs and phototransistor output. Use Value: ≥100 % CTR ensures reliable detection even at low ring current amplitudes (<5 mA), reducing false-negative alerts. |
Use Scenario: Monitoring DC loop current (20–60 mA) to determine line seizure status in fax/modem line cards. IC Role / Device Role / Timing Role: LH1529GP optocoupler provides galvanically isolated current feedback without shunt resistor power loss. Use Value: Bidirectional input allows same circuit to monitor forward/reverse loop flow, supporting hybrid line configurations. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Vishay LH1529FP | CTR min. = 33 % (vs. 100 % for LH1529GP); otherwise identical SSR specs and pinout. | Requires external amplification for weak-ring detection; less suitable for low-current loop sensing. | Select LH1529FP only when cost sensitivity outweighs CTR margin and system-level gain is available. |
| Vishay VO615A-3X006 | Single-channel optocoupler (no integrated SSR); CTR min. = 100 %; 5000 VRMS isolation; SO-4 package. | Cannot replace LH1529GP's dual-function capability - requires separate SSR for hook control. | Use VO615A-3X006 only when optocoupler-only function is needed or board space permits discrete SSR + coupler pairing. |
Compared with LH1529FP and VO615A-3X006, the LH1529GP uniquely combines high-CTR sensing and high-voltage SSR switching in one SMD-8 package - eliminating inter-component timing mismatch, reducing PCB area by ~40 %, and simplifying compliance testing for telecom isolation requirements.
Availability
LH1529GP is available at Aetrix Electronics and suitable for PCMCIA/Notebook interfaces, telecom line card designs, and VoIP analog terminal adapters requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for LH1529GP 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, high-voltage performance, and industry-standard certifications.
The LH1529GP belongs to Vishay's telecom switch product line, engineered specifically for analog telephony interface functions including hook control, dial pulse generation, ring detection, and loop supervision - all within a single isolated package.
FAQ
What is the isolation voltage rating of the LH1529GP?
The LH1529GP is rated for 3000 VRMS input-to-output isolation per UL1577 and DIN EN 60747-5-2. This isolation is verified across both the SSR and optocoupler channels and applies to the full operating temperature range (–40 °C to +85 °C). The isolation resistance exceeds 10¹² Ω at 25 °C and remains ≥10¹¹ Ω at 100 °C, ensuring long-term reliability in humid or contaminated environments.
Does the LH1529GP support bidirectional current sensing?
Yes, the LH1529GP supports true bidirectional current sensing via two anti-parallel GaAs infrared LEDs in its optocoupler channel. This design allows it to detect both AC ring signals (20–25 Hz) and DC loop current flow in either direction - a key requirement for universal POTS line interface designs. The phototransistor output delivers ≥100 % CTR regardless of current polarity.
What is the maximum load voltage the LH1529GP SSR can switch?
The LH1529GP SSR supports a maximum DC or peak AC load voltage of ±350 V, as specified in the absolute maximum ratings. This rating is validated across temperature and includes built-in current-limit protection that activates at 170–250 mA to prevent failure during lightning-induced surges or line faults. The SSR maintains clean switching up to this voltage with <1 μA off-state leakage at ±350 V.
Is the LH1529GP RoHS-compliant and certified?
Yes, the LH1529GP is RoHS-compliant per Directive 2011/65/EU and WEEE 2002/96/EC. It carries UL1577 certification (File E52744, System Code O, Double Protection) and FIMKO approval. Vishay confirms full compliance with material restrictions and environmental directives - no exemptions apply, and the device is suitable for use in EU-marketed telecom equipment.
How does the LH1529GP differ from the LH1529FP?
The primary difference is CTR performance: LH1529GP guarantees ≥100 % CTR at 6 mA, while LH1529FP guarantees only ≥33 %. All other electrical and mechanical specifications - including SSR RON, load voltage/current, isolation, package, and pinout - are identical. The higher CTR of LH1529GP eliminates need for signal conditioning in ring detection and low-current loop sensing applications.
LH1529GP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1529
- Packaging:
- Tube
- 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:
- -
LH1529GP FAQ
1.How can I place an order for LH1529GP through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1529GP 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 LH1529GP reliable?
The price and inventory of LH1529GP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1529GP is usually 5 days.
3.What payment methods are accepted for LH1529GP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1529GP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1529GP?
LH1529GP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1529GP 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 LH1529GP?
For technical support, including LH1529GP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1529GP requirements.
6.How does Aetrix verify that LH1529GP is sourced from the original manufacturer or authorized distributors?
All LH1529GP 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 LH1529GP meets industry standards.
7.What is the process for return or replacement of LH1529GP?
All LH1529GP units undergo pre-shipment inspection (PSI). If there is an issue with LH1529GP, 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 LH1529GP part is unused and in its original packaging.
Return procedure for LH1529GP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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