Vishay Semiconductor Opto Division LH1526AACTR

Overview

LH1526AACTR from Vishay Semiconductors is a dual-channel, 1 Form A solid-state relay (SSR) with GaAlAs LED input and MOSFET output stages, delivering SPST normally open switching for AC/DC loads up to 400 V and 125 mA per channel. It provides 5300 VRMS isolation, sub-1 mA turn-on LED current, and bounce-free operation - ideal for low-power telecom switching and battery-powered instrumentation.

For engineers reviewing the LH1526AACTR datasheet, LH1526AACTR pinout, LH1526AACTR application, or LH1526AACTR equivalent, this device supports high-reliability, low-noise load control in space-constrained SMD-8 layouts while meeting UL, cUL, VDE, and CQC safety certifications.

Technical Context

The LH1526AACTR integrates two independent optically isolated SSR channels in a single SMD-8 package. Each channel uses a GaAlAs infrared LED to drive complementary MOSFETs, enabling zero-crossing–free, DC-coupled switching with <0.6 ms turn-on and <0.04 ms turn-off times at 1.5 mA LED drive.

Its input-to-output insulation meets IEC 60747-5-5 requirements with VIORM = 890 Vpeak and CTI ≥175, supporting reinforced insulation in industrial controls. The device operates across –40 °C to +85 °C ambient and maintains ≤36 Ω on-resistance and ≥5 GΩ off-resistance under rated load conditions.

Key Specifications

Pinout & Package

SMD-8 surface-mount package (9.80 × 6.65 mm, 1.00 mm height), RoHS-compliant, moisture sensitivity level 1, compatible with standard reflow profiles per J-STD-020.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar solid-state relay applications.

Compared with LH1526AB and TLP3545A, the LH1526AACTR delivers dual-channel coordination in a space-optimized SMD-8 footprint with best-in-class 0.9 mA turn-on current - critical for energy-constrained embedded systems where layout density and power budget are co-constrained.

Availability

LH1526AACTR is available at Aetrix Electronics and suitable for telecom line switching, battery-powered instrumentation, and industrial PLC I/O modules requiring stable component supply, long-term lifecycle support, and certified safety isolation.

Supply support for LH1526AACTR 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, sensors, and optoelectronics with emphasis on reliability, precision, and safety-certified performance.

The LH1526AACTR belongs to Vishay's LH15xx family of dual-channel opto-MOS relays, engineered specifically for replacing electromechanical relays in high-reliability, low-power, and safety-critical applications across industrial, medical, and telecom infrastructure.

FAQ

What is the maximum continuous load current per channel for LH1526AACTR at 85 °C ambient?

The LH1526AACTR supports 100 mA continuous DC load current per channel at 85 °C ambient temperature, as specified in the Absolute Maximum Ratings table. This derating from the 125 mA rating at 25 °C ensures safe thermal operation without exceeding the 550 mW SSR output power dissipation limit. Designers must verify PCB copper area and airflow to maintain junction temperature below 125 °C.

Does LH1526AACTR support AC load switching, and what is its peak repetitive voltage rating?

Yes, the LH1526AACTR supports both AC and DC load switching with a maximum DC or peak AC load voltage of 400 V. Its VIORM (maximum repetitive peak isolation voltage) is 890 Vpeak per DIN EN 60747-5-5, confirming suitability for 230 VAC RMS mains applications with appropriate transient suppression. The MOSFET output stage is inherently bidirectional and does not require polarity alignment.

What is the minimum LED forward current required to reliably turn on LH1526AACTR at –40 °C?

At –40 °C, the LH1526AACTR requires a minimum LED forward current of approximately 1.5× the 25 °C typical value due to GaAlAs LED efficiency reduction. Based on Fig. 7 in the datasheet, normalized turn-on current rises to ~1.4× at –40 °C, so a design target of ≥1.3 mA ensures robust activation across the full temperature range. A 1.5 mA drive is recommended for margin.

Can LH1526AACTR be used in medical equipment requiring BF isolation per IEC 60601-1?

Yes, the LH1526AACTR meets BF-rated patient isolation requirements: it provides ≥7 mm creepage and clearance, ≥0.4 mm insulation thickness, and 5300 VRMS withstand voltage - all validated per IEC 60747-5-5 and certified under CQC GB4943.1 and GB8898. When implemented with proper PCB layout (e.g., slots, spacing), it satisfies IEC 60601-1 Clause 8.8.3 for applied part isolation.

How does the output capacitance of LH1526AACTR affect high-frequency signal integrity?

The LH1526AACTR exhibits 6 pF output capacitance at 50 V bias and 1 MHz, rising to 39 pF at 1 V. This low, voltage-dependent capacitance minimizes capacitive feedthrough in fast-switching applications - for example, limiting crosstalk to <10 mV in 10 Vpp, 1 MHz control signals routed adjacent to sensitive analog paths. Layout separation remains essential for sub-mV noise floors.