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Vishay Semiconductor Opto Division LH1529AAC
- Part No.:
- LH1529AAC
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1529AAC.pdf
- Description:
- SSR RELAY SPST-NO 120MA 0-350V
- Quantity:
- Payment:
- Shipping:
Inventory:3,636
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Product details
Overview
LH1529AAC from Vishay Semiconductors is a surface-mount telecom switch integrating a solid-state relay (SSR) and a bidirectional optocoupler in one 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 on/off hook control and ring detection in legacy telephony systems.
For engineers reviewing the LH1529AAC datasheet, LH1529AAC pinout, LH1529AAC application, or LH1529AAC 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 compatibility with DIP-8 footprint alternatives for board-level redesign.
Technical Context
The LH1529AAC implements dual functional blocks: an SSR with MOSFET-based switching (RON = 20 Ω, VL = 350 V, IL = 120 mA) and a phototransistor optocoupler with bidirectional current sensing (CTRDC ≥33 %, BVCEO = 30 V). Both share 5300 VRMS galvanic isolation and operate across –40 °C to +85 °C ambient.
Its SSR section features clean bounce-free switching, current-limit protection (260 mA typ.), and low power consumption; the optocoupler supports loop current sensing and ring detection via bidirectional conduction - confirmed by electrical test conditions specifying IF = 6 mA, VCE = 0.5 V for CTR and VL = ±300 V for IFoff.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Isolation Voltage | 5300 VRMS - enables safe separation between telecom line-side and logic-side circuitry per UL1577 pending approval |
| SSR On-Resistance | 20 Ω typical - ensures minimal I²R loss during 120 mA load switching in hook-switch applications |
| Load Voltage Rating | 350 V DC/AC peak - supports operation across standard POTS line voltages including ringing (≈90 V RMS) |
| CTR (DC) | ≥33 % at IF = 6 mA, VCE = 0.5 V - guarantees reliable optocoupler output drive under low-input-current conditions |
| Turn-On Time | 2 ms typical - meets telecom dial-pulse timing requirements (≤10 ms pulse width) |
| Current Limit Threshold | 260 mA typical - protects SSR against short-circuit transients without external limiting components |
| Off-State Leakage | ≤1 μA at ±350 V - maintains high impedance state during line idle, critical for low-power ring detection |
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, pin 1 marked with dot or bevel.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | SSR LED Anode/Cathode | Drive SSR switching via forward current (IF ≤ 50 mA); polarity defines SSR activation direction |
| 4, 6 | SSR Load Terminals (±) | AC/DC load path with 350 V rating and 20 Ω RON; bidirectional conduction enabled |
| 3, 5 | Optocoupler LED Anode/Cathode | Bidirectional input: either pin may serve as anode depending on current direction for ring/loop sensing |
| 7, 8 | Optocoupler Collector/Emitter | Phototransistor output with BVCEO = 30 V; CTR ≥33 % enables direct MCU interface without amplification |
Key Features
| Feature | Design Value |
|---|---|
| Dual-function integration | Single SMD-8 package combines SSR (hook/dial control) and optocoupler (ring/loop sensing), reducing board area vs. discrete solutions |
| Current-limit protected SSR | 260 mA internal limit prevents latch-up or thermal runaway during line faults - eliminates need for external fusing |
| Bidirectional optocoupler input | Enables detection of AC ring signals and DC loop current using same terminals - simplifies analog front-end design |
| Bounce-free switching | Zero mechanical contact wear and no contact chatter - ensures reliable pulse counting in dial applications over >10⁶ cycles |
| High isolation resistance | ≥10¹² Ω at 25 °C - maintains signal integrity and safety margin in humid or contaminated telecom environments |
Applications
| On/Off Hook Control | Dial Pulse Switching |
|---|---|
Use Scenario: Detecting handset lift/hang-up events in analog telephone sets to initiate or terminate line connection. IC Role / Device Role / Timing Role: LH1529AAC SSR acts as isolated line switch; optocoupler monitors loop current to confirm off-hook state. Use Value: 120 mA load current and 350 V rating support full POTS line compliance; CTR ≥33 % ensures stable detection at low loop currents (20–50 mA). | Use Scenario: Generating timed pulses during rotary dial operation by opening/closing the telephone line circuit. IC Role / Device Role / Timing Role: LH1529AAC SSR replaces electromechanical dial contacts; optocoupler verifies pulse timing via loop current feedback. Use Value: 2 ms turn-on and 0.6 ms turn-off times meet ITU-T Q.11 specification for pulse width (50–100 ms) and break ratio (60 %), ensuring accurate digit decoding. |
| Ring Current Detection | Loop Current Sensing |
Use Scenario: Identifying incoming call rings (75–90 V RMS, 20 Hz) on analog telephone lines without transformer coupling. IC Role / Device Role / Timing Role: LH1529AAC optocoupler operates bidirectionally to rectify and detect AC ring waveform; SSR remains inactive. Use Value: Bidirectional LED input and ≥33 % CTR enable direct ring amplitude sensing at <1 mA average input - eliminating external bridge rectifiers. | Use Scenario: Monitoring DC loop current (20–60 mA) to determine line status (idle, off-hook, fault) in PBX or VoIP gateway interfaces. IC Role / Device Role / Timing Role: LH1529AAC optocoupler provides isolated current-to-voltage conversion; SSR isolates control logic from line voltage. Use Value: 0.02 nA to 1 μA off-state leakage ensures minimal error in low-current measurement; 30 V BVCEO supports common-base sensing topologies. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar telecom switch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LH1529BAC | CTR min. = 100 % (vs. 33 %), identical SSR specs, same SMD-8 package | Higher CTR improves noise immunity in low-signal ring detection but requires higher LED drive current | Select LH1529BAC when system LED drive exceeds 6 mA and ring detection reliability under EMI is critical |
| LH1529BB | DIP-8 through-hole package, CTR min. = 100 %, same SSR parameters, 1.3 ms faster turn-on | Not surface-mountable; better suited for prototyping or legacy wave-soldered telecom hardware | Choose LH1529BB only if board assembly uses DIP-8 footprints and manual rework tolerance is required |
Compared with LH1529BAC and LH1529BB, the LH1529AAC offers lowest LED drive requirement (33 % CTR) and SMD-8 compatibility - making it optimal for cost-sensitive, high-volume telecom endpoint designs where PCB real estate and automated assembly are prioritized.
Availability
LH1529AAC is available at Aetrix Electronics and suitable for telecom endpoint design, analog line card development, and legacy POTS interface replacement requiring stable component supply despite end-of-life status.
Supply support for LH1529AAC 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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power MOSFETs, and precision resistors.
The LH1529 series was designed specifically for telecom switching applications - integrating SSR and optocoupler functions to replace electromechanical relays and discrete isolation stages in analog telephone infrastructure.
FAQ
What is the isolation voltage rating of the LH1529AAC?
The LH1529AAC provides 5300 VRMS input-to-output isolation for 60 seconds, verified per UL1577 (pending) and FIMKO standards. This rating applies across both the SSR and optocoupler sections and ensures safety compliance in POTS line interface applications where primary-secondary separation is mandatory. The LH1529AAC maintains ≥10¹² Ω isolation resistance at 25 °C, supporting long-term reliability in humid operating environments.
Does the LH1529AAC support bidirectional signal detection?
Yes, the LH1529AAC optocoupler section supports bidirectional current flow on pins 3 and 5, enabling detection of both AC ring signals and DC loop current without external polarity reversal circuitry. This functionality is explicitly confirmed in the datasheet's "Optocoupler" subsection and electrical test conditions referencing bidirectional current detection. The LH1529AAC's design eliminates the need for external bridge rectifiers in ring-sensing paths.
What is the maximum continuous load current the LH1529AAC SSR can switch?
The LH1529AAC SSR supports a maximum continuous DC load current of 120 mA, as specified in the Absolute Maximum Ratings table. This value is validated at Tamb = 25 °C and must be derated linearly above 25 °C per the thermal resistance curve. At 85 °C ambient, the usable load current reduces to approximately 85 mA. The LH1529AAC also includes internal current-limit protection at 260 mA to prevent damage during transient overloads.
Is the LH1529AAC still in production?
No, the LH1529AAC reached End of Life in January 2018, as documented in Vishay's official revision history (Rev. 1.5, 10-May-12). However, Aetrix Electronics maintains legacy inventory and supports controlled procurement for ongoing production programs. Traceable sourcing and lifecycle coordination are available for customers requiring continued supply of the LH1529AAC in existing designs.
What package type does the LH1529AAC use?
The LH1529AAC uses an SMD-8 surface-mount package conforming to JEDEC MS-012AC dimensions: 9.77 mm × 6.09 mm × 3.55 mm body size, 2.54 mm lead pitch, gull-wing terminations. Pin 1 is identified by a dot or beveled corner. This package is distinct from the DIP-8 variant used by LH1529BB and enables automated pick-and-place assembly in high-volume telecom hardware manufacturing.
LH1529AAC 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:
- 1.26VDC
- 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:
- -
LH1529AAC FAQ
1.How can I place an order for LH1529AAC through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1529AAC 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 LH1529AAC reliable?
The price and inventory of LH1529AAC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1529AAC is usually 5 days.
3.What payment methods are accepted for LH1529AAC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1529AAC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1529AAC?
LH1529AAC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1529AAC 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 LH1529AAC?
For technical support, including LH1529AAC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1529AAC requirements.
6.How does Aetrix verify that LH1529AAC is sourced from the original manufacturer or authorized distributors?
All LH1529AAC 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 LH1529AAC meets industry standards.
7.What is the process for return or replacement of LH1529AAC?
All LH1529AAC units undergo pre-shipment inspection (PSI). If there is an issue with LH1529AAC, 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 LH1529AAC part is unused and in its original packaging.
Return procedure for LH1529AAC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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