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Vishay Semiconductor Opto Division LH1529AACTR
- Part No.:
- LH1529AACTR
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1529AACTR.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:2,678
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Product details
Overview
LH1529AACTR from Vishay Semiconductors is a surface-mount telecom switch integrating a solid-state relay (SSR) and a bidirectional optocoupler in a single SMD-8 package. It delivers 5300 VRMS input/output isolation, 20 Ω typical on-resistance, 350 V load voltage capability, and 120 mA continuous load current - enabling reliable on/off hook control and ring detection in legacy telephony interfaces.
For engineers reviewing the LH1529AACTR datasheet, LH1529AACTR pinout, LH1529AACTR application, or LH1529AACTR equivalent, key selection criteria include CTR ≥33 %, turn-on/turn-off times of 2 ms / 0.6 ms, current-limit protection at 260 mA, and compliance with UL1577 (pending) and FIMKO (pending) for telecom-grade isolation.
Technical Context
The LH1529AACTR implements dual functional blocks: a phototransistor-based optocoupler for bidirectional loop current sensing and ring detection, and an integrated SSR with MOSFET output stage for clean, bounce-free switching. Its SSR replaces mechanical relays in telecom line interface cards, while the optocoupler supports both forward and reverse current detection without polarity constraints.
Isolation is achieved via internal dielectric barrier rated to 5300 VRMS for 60 s, with isolation resistance ≥10¹² Ω at 25 °C. The device operates across –40 °C to +85 °C ambient, supports reflow soldering per JEDEC J-STD-020, and features built-in current-limit protection that clamps output at 260 mA during overcurrent events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - ensures safety and regulatory compliance in telecom line-side applications requiring reinforced insulation |
| SSR On-Resistance | 20 Ω typical - minimizes I²R power loss and voltage drop across switched line paths |
| Load Voltage Rating | 350 V - supports operation across standard POTS line voltages including ringing (≈90 VAC) and off-hook DC (≈–48 V) |
| Continuous Load Current | 120 mA - sufficient for driving electromechanical components and sustaining loop current in analog telephone interfaces |
| DC Current Transfer Ratio | ≥33 % - guarantees reliable optocoupler output drive under worst-case LED aging and temperature conditions |
| Turn-On / Turn-Off Time | 2 ms / 0.6 ms - enables accurate dial pulse timing and fast hook-state transitions in legacy telephony systems |
| Current Limit Threshold | 260 mA - protects SSR output stage during short-circuit or surge events without external circuitry |
Pinout & Package
SMD-8 package (JEDEC MS-012AC), 9.77 mm × 6.09 mm × 3.55 mm body, gull-wing leads, 2.54 mm pitch, RoHS-compliant matte tin lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode | Input side for optocoupler; bidirectional conduction allows ring detection in either polarity |
| 3, 4 | SSR Output Terminals (+/–) | AC/DC-switched load path; pins 4 and 6 are symmetrical ± terminals for SSR output |
| 5, 6 | SSR Output Terminals (+/–) | Redundant SSR output connections; pin 4 and pin 6 are electrically identical for layout flexibility |
| 7, 8 | Phototransistor Collector / Emitter | Optocoupler output; collector (pin 7) connects to pull-up, emitter (pin 8) to ground for active-low sensing |
Key Features
| Feature | Design Value |
|---|---|
| Bidirectional optocoupler input | Enables ring detection and loop current monitoring regardless of line polarity - eliminates need for external bridge rectification |
| Integrated current-limit protection | Clamps SSR output current at 260 mA without external sense resistors or shutdown logic |
| Clean bounce-free switching | Eliminates contact chatter artifacts in dial-pulse generation and hook-state transitions - critical for legacy telephony signaling |
| 5300 VRMS isolation | Meets telecom safety requirements for primary-to-secondary separation in line interface units and central office equipment |
| SMD-8 footprint compatibility | Shares land pattern with industry-standard DIP-8 and SOIC-8 variants - simplifies PCB redesign when migrating from through-hole |
Applications
| On/Off Hook Control | Dial Pulse Switching |
|---|---|
Use Scenario: Detecting and controlling subscriber line state in analog telephone interface cards (TICs) for PBX or VoIP gateways. IC Role / Device Role / Timing Role: LH1529AACTR acts as isolated line-state switch and status sensor - SSR toggles loop closure, optocoupler reports hook state. Use Value: Enables microcontroller-based hook supervision with galvanic isolation, eliminating opto-isolator + relay discrete solutions. | Use Scenario: Generating standardized rotary-dial pulse trains (10 pps, 60 % break ratio) for legacy phone system compatibility. IC Role / Device Role / Timing Role: LH1529AACTR SSR provides precise, jitter-free mechanical relay replacement - optocoupler verifies pulse integrity via loop current feedback. Use Value: Achieves sub-millisecond timing accuracy and >10⁶ cycle lifetime versus electromechanical relays prone to contact wear. |
| Ringing Current Detection | Loop Current Sensing |
Use Scenario: Identifying incoming call ring signals (90 VAC, 20 Hz) on POTS lines without disturbing DC bias or introducing noise. IC Role / Device Role / Timing Role: LH1529AACTR optocoupler detects bidirectional AC ring current; SSR remains off until ring detection completes. Use Value: Eliminates need for separate AC coupling, rectification, and threshold detection circuitry - reduces BOM count by 4+ passive components. | Use Scenario: Monitoring DC loop current (20–60 mA) to determine line seizure, fault conditions, or handset off-hook status. IC Role / Device Role / Timing Role: LH1529AACTR phototransistor provides linear current-proportional output; SSR isolates measurement path from line voltage. Use Value: Delivers stable, temperature-compensated current sensing across –40 °C to +85 °C with no calibration drift. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LH1529BACTR | CTR min. = 100 % (vs. 33 %); same SSR specs, package, and pinout | Better signal margin in low-IF or high-temperature designs; identical function in ring/hook/dial use cases | Select LH1529BACTR when higher CTR is required for long-term reliability or marginal drive conditions |
| ILQ74 | Single-channel SSR + optocoupler; 4000 VRMS isolation; 150 mA load rating; DIP-8 only | Lacks bidirectional input - requires external rectifier for ring detection; lower isolation voltage | Choose ILQ74 only if DIP-8 is mandatory and bidirectional sensing is not needed |
Compared with LH1529BACTR and ILQ74, the LH1529AACTR offers the lowest-cost path to bidirectional ring detection and guaranteed CTR margin in SMD-8 telecom interfaces, while avoiding layout compromises required by DIP-only alternatives or external rectification.
Availability
LH1529AACTR is available at Aetrix Electronics and suitable for telecom line interface cards, analog PBX modules, and VoIP gateway design requiring stable component supply, long-lifecycle support, and legacy telephony compatibility.
Supply support for LH1529AACTR 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 Semiconductors is a global leader in discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power management, and sensing solutions.
The LH1529 series was developed specifically for telecom infrastructure applications requiring combined SSR switching and bidirectional current sensing in a single isolated package - targeting analog line card, central office, and legacy interface markets.
FAQ
What is the isolation voltage rating of the LH1529AACTR and how is it verified?
The LH1529AACTR is rated for 5300 VRMS input-to-output isolation for 60 seconds, per its Vishay datasheet (Doc. #83827). This value is confirmed by factory hi-pot testing and aligns with pending UL1577 and FIMKO certifications. The isolation barrier uses molded compound and internal spacing designed to meet telecom safety standards for primary-side line interfacing.
Does the LH1529AACTR support bidirectional current detection for ring signal sensing?
Yes, the LH1529AACTR's optocoupler input is explicitly bidirectional, enabling direct AC ring signal detection without external rectification. As stated in the Vishay datasheet, this feature supports ring current detection and loop current sensing functions - a key differentiator from unidirectional optocouplers like the ILQ74.
What is the current limit threshold of the LH1529AACTR's solid-state relay output?
The LH1529AACTR SSR includes integrated current-limit protection that activates at 260 mA (typical), as specified in the Electrical Characteristics table for LH1529AAC and LH1529AACTR variants. This protects the output stage during overload or short-circuit events without requiring external current-sense resistors or control logic.
Is the LH1529AACTR pin-compatible with other variants in the LH1529 family?
Yes, all LH1529 variants - including LH1529AACTR, LH1529BACTR, and LH1529BB - share identical SMD-8 or DIP-8 pinouts and terminal assignments. Pin 1–2 are LED terminals, pins 3–6 are SSR output terminals (±), and pins 7–8 are phototransistor terminals. This allows direct substitution within the same package type.
What is the minimum CTR guaranteed for the LH1529AACTR and why does it matter?
The LH1529AACTR guarantees a minimum DC current transfer ratio (CTR) of 33 % at IF = 6 mA and VCE = 0.5 V. This ensures robust optocoupler output drive across temperature, aging, and supply variations - critical for reliable ring detection and loop monitoring in unattended telecom equipment operating over 10+ years.
LH1529AACTR 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:
- 1.26VDC
- 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:
- -
LH1529AACTR FAQ
1.How can I place an order for LH1529AACTR through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1529AACTR 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 LH1529AACTR reliable?
The price and inventory of LH1529AACTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1529AACTR is usually 5 days.
3.What payment methods are accepted for LH1529AACTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1529AACTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1529AACTR?
LH1529AACTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1529AACTR 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 LH1529AACTR?
For technical support, including LH1529AACTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1529AACTR requirements.
6.How does Aetrix verify that LH1529AACTR is sourced from the original manufacturer or authorized distributors?
All LH1529AACTR 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 LH1529AACTR meets industry standards.
7.What is the process for return or replacement of LH1529AACTR?
All LH1529AACTR units undergo pre-shipment inspection (PSI). If there is an issue with LH1529AACTR, 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 LH1529AACTR part is unused and in its original packaging.
Return procedure for LH1529AACTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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