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Vishay Semiconductor Opto Division LH1526AAC
- Part No.:
- LH1526AAC
- Manufacturer:
- Vishay Semiconductor Opto Division
- Category:
- Solid State Relays (SSR)
- Package:
- 8-SMD (0.300", 7.62mm)
- Datasheet:
-
LH1526AAC.pdf
- Description:
- SSR RELAY SPST-NO 100MA 0-400V
- Quantity:
- Payment:
- Shipping:
Inventory:2,343
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Product details
Overview
LH1526AAC from Vishay Semiconductors is a dual-channel, 1 Form A solid-state relay (SSR) featuring GaAlAs LED input control and MOSFET output switches. It delivers 400 V load voltage rating, 125 mA per-channel DC load current at 25 °C, and 5300 VRMS isolation - replacing electromechanical relays in low-power, bounce-free switching applications such as telecom line interface boards and portable instrumentation.
For engineers reviewing the LH1526AAC datasheet, LH1526AAC pinout, LH1526AAC application, or LH1526AAC equivalent, key selection criteria include its ultra-low 0.9 mA typical turn-on LED current, 22 Ω typical on-resistance, 0.15 ms typical turn-off time at 5 mA drive, and SMD-8 package compatibility with automated assembly for space-constrained industrial controls.
Technical Context
The LH1526AAC integrates two optically isolated SPST normally open switches in a single monolithic package. Each channel uses a GaAlAs infrared LED to trigger a pair of back-to-back MOSFETs, enabling bidirectional AC/DC load switching without mechanical contacts or contact bounce.
Its safety-rated insulation system meets UL, cUL, VDE, and CQC standards with 5300 VRMS withstand voltage and ≥7 mm creepage/clearance. The device operates across –40 °C to +85 °C ambient and supports safe power dissipation up to 600 mW under defined thermal conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Load Voltage | 400 V - supports direct switching of 230 VAC mains and 380 VDC industrial bus lines without external snubbers. |
| Per-Channel Load Current | 125 mA at 25 °C - sufficient for driving solenoids, small relays, LED arrays, and telecom signaling circuits. |
| Turn-On LED Current | ≤ 0.9 mA typical - enables direct microcontroller GPIO drive without buffer transistors, reducing BOM count. |
| On-Resistance | 22 Ω typical - limits conduction loss to <1.5 mW at 10 mA load, critical for battery-powered instrumentation. |
| Isolation Voltage | 5300 VRMS - satisfies reinforced insulation requirements for Class I equipment per IEC 60747-5-5. |
| Turn-Off Time | 0.05 ms typical at 5 mA LED drive - ensures fast signal gating in data acquisition and test equipment sequencing. |
| Output Capacitance | 6 pF at 50 V - minimizes capacitive coupling noise in high-impedance analog measurement paths. |
Pinout & Package
SMD-8 surface-mount package (9.80 × 6.65 × 3.55 mm), RoHS-compliant, moisture sensitivity level 1, compatible with lead-free reflow per J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2 | LED Anode / Cathode (Channel 1) | Optical input for first SSR channel; requires series resistor to limit IF ≤ 50 mA. |
| 3, 4 | LED Anode / Cathode (Channel 2) | Independent optical input for second SSR channel; electrically isolated from Channel 1. |
| 5, 6 | Load Terminal (Channel 1) | Back-to-back MOSFET output; bidirectional, no polarity sensitivity for AC/DC loads. |
| 7, 8 | Load Terminal (Channel 2) | Second independent SSR output; galvanically isolated from all other pins including Channel 1 outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent SSR channels | Two fully isolated 400 V / 125 mA switches in one SMD-8 package - reduces board area vs. discrete optocoupler + MOSFET solutions. |
| Ultra-low LED drive requirement | 0.9 mA typical turn-on current - eliminates need for driver ICs or transistor buffers when interfacing with low-power MCUs. |
| Bounce-free switching | No mechanical contacts or arcing - enables reliable timing-critical operations in data logging and automated test systems. |
| High-speed turn-off | 0.05 ms typical at 5 mA LED drive - supports pulse-width modulation and rapid state transitions in programmable logic controllers. |
| Reinforced safety isolation | 5300 VRMS withstand, ≥7 mm creepage/clearance, CTI 175 - certified for use in medical auxiliary circuits and industrial mains interfaces. |
Applications
| Telecom Line Interface | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Isolated switching of POTS line supervision signals and ring-trip detection in VoIP gateways. IC Role / Device Role / Timing Role: Dual-channel SSR providing galvanic isolation between MCU logic and telephone line voltages up to ±350 V. Use Value: Eliminates relay coil inrush current and contact wear while maintaining 5300 VRMS isolation required for telco safety compliance. |
Use Scenario: Remote-controlled power routing in handheld multimeters and portable oscilloscope front-end modules. IC Role / Device Role / Timing Role: Low-current-load switch enabling MCU-governed power domain sequencing with <1 μA off-state leakage. Use Value: Extends battery life via 0.9 mA turn-on threshold and 600 mW max output power dissipation within thermal envelope. |
| Industrial PLC I/O Modules | Medical Auxiliary Power Control |
|
Use Scenario: Digital output stage for 24 VDC sensor actuation and solenoid control in DIN-rail mounted controllers. IC Role / Device Role / Timing Role: Solid-state replacement for EM relays handling 100 mA loads with 0.15 ms turn-off for precise timing in motion control loops. Use Value: Enables 100 k-cycle lifetime vs. 10 k-cycle mechanical relays, with no contact degradation in dusty factory environments. |
Use Scenario: Isolated enable/disable control of auxiliary 5 V/12 V rails in diagnostic imaging subsystems (e.g., ultrasound beamformer bias supplies). IC Role / Device Role / Timing Role: Safety-certified SSR providing reinforced insulation between patient-connected circuits and main logic ground. Use Value: Meets IEC 60601-1 creepage/clearance and 5300 VRMS isolation requirements without additional barrier components. |
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 VO3120 | Single-channel, DIP-6 package, 400 V/120 mA, 1.5 mA turn-on current | Lower integration density; requires two units for dual functionality; larger footprint | Select when legacy DIP layout or single-channel granularity is preferred over space-constrained SMD designs. |
| Toshiba TLP3547 | Dual-channel, SMD-8, 400 V/100 mA, 1.2 mA turn-on current, 30 Ω RON | Higher on-resistance increases conduction loss; slightly slower turn-off (0.2 ms) | Choose if existing design uses Toshiba ecosystem or requires tighter parametric consistency with TLP35xx family. |
Compared with VO3120 and TLP3547, the LH1526AAC offers the lowest LED drive requirement (0.9 mA), tightest on-resistance (22 Ω), and fastest turn-off (0.05 ms), making it optimal for battery-powered, high-density, and timing-critical dual-switching applications where thermal headroom and PCB area are constrained.
Availability
LH1526AAC is available at Aetrix Electronics and suitable for telecom line interface, battery-powered instrumentation, industrial PLC I/O modules, and medical auxiliary power control requiring stable component supply and long-term production continuity.
Supply support for LH1526AAC 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 manufacturer of discrete semiconductors and passive components, specializing in high-reliability optoelectronics, power management, and sensing solutions for industrial, automotive, and computing markets.
The LH1526AAC belongs to Vishay's LH-series solid-state relay family, engineered specifically to replace electromechanical relays in space-, power-, and reliability-constrained applications demanding clean, fast, and safety-certified switching.
FAQ
What is the maximum continuous load current per channel for LH1526AAC at 85 °C ambient?
The LH1526AAC supports 100 mA continuous DC load current per channel at 25 °C, derating to approximately 80 mA per channel at 85 °C ambient temperature as shown in Figure 4 of the datasheet. This derating ensures safe operation within the 550 mW SSR output power dissipation limit and maintains junction temperature below 175 °C.
Does LH1526AAC support AC load switching, and what is its peak repetitive voltage rating?
Yes, the LH1526AAC supports bidirectional AC load switching due to its back-to-back MOSFET output configuration. Its maximum repetitive peak isolation voltage (VIORM) is 890 Vpeak, and its DC or peak AC load voltage rating is 400 V - making it suitable for 230 VAC RMS applications with appropriate safety margins.
Can LH1526AAC be driven directly from a 3.3 V microcontroller GPIO without a current-limiting resistor?
No - a series current-limiting resistor is mandatory. While the LH1526AAC requires only ≤0.9 mA typical LED forward current to turn on, its forward voltage is 0.8–1.6 V at 10 mA. Driving directly from 3.3 V GPIO risks exceeding the 50 mA absolute maximum LED forward current; a resistor (e.g., 2.7 kΩ for ~0.9 mA at 3.3 V) must be used to ensure reliability.
What safety certifications does LH1526AAC hold, and which standards do they cover?
The LH1526AAC is certified to UL 1577, cUL CSA Component Acceptance Notice No. 5, VDE EN 60747-5-5, and CQC GB4943.1/GB8898. These cover reinforced insulation, 5300 VRMS withstand voltage, 8000 Vpeak transient isolation, and compliance with pollution degree 2 and CTI ≥175 for industrial and medical auxiliary applications.
How does the LH1526AAC differ from the LH1526AB variant in terms of package and assembly compatibility?
The LH1526AAC uses an SMD-8 package (9.80 × 6.65 mm) with gull-wing leads for surface-mount reflow, while the LH1526AB uses a DIP-8 through-hole package (10.16 × 6.65 mm). Both share identical electrical specifications and pinout mapping, but LH1526AAC supports automated pick-and-place and lead-free reflow per J-STD-020, whereas LH1526AB is intended for wave soldering.
LH1526AAC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Vishay Semiconductor Opto Division
- Series:
- LH1526
- Packaging:
- Tube
- Product Status:
- Active
- Mounting Type:
- Surface Mount
- Circuit:
- SPST-NO (1 Form A) x 2
- Output Type:
- AC, DC
- Voltage - Input:
- 1.15VDC
- Voltage - Load:
- 0 V ~ 400 V
- Load Current:
- 100 mA
- On-State Resistance (Max):
- 25 Ohms
- Termination Style:
- Gull Wing
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SMD
- Approval Agency:
- CQC, cUL, UL, VDE
- Grade:
- -
- Qualification:
- -
LH1526AAC FAQ
1.How can I place an order for LH1526AAC through Aetrix?
Please submit a Request for Quotation (RFQ) for LH1526AAC 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 LH1526AAC reliable?
The price and inventory of LH1526AAC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LH1526AAC is usually 5 days.
3.What payment methods are accepted for LH1526AAC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LH1526AAC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LH1526AAC?
LH1526AAC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LH1526AAC 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 LH1526AAC?
For technical support, including LH1526AAC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LH1526AAC requirements.
6.How does Aetrix verify that LH1526AAC is sourced from the original manufacturer or authorized distributors?
All LH1526AAC 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 LH1526AAC meets industry standards.
7.What is the process for return or replacement of LH1526AAC?
All LH1526AAC units undergo pre-shipment inspection (PSI). If there is an issue with LH1526AAC, 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 LH1526AAC part is unused and in its original packaging.
Return procedure for LH1526AAC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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