Vishay Semiconductor Opto Division VOR2142B8T

Overview

VOR2142B8T from Vishay Semiconductors is a dual-channel, normally open, optically isolated solid-state relay (SPST, 1 Form A) with 400 V load voltage rating, 140 mA single-channel DC load current, and 22 Ω typical on-resistance. It uses a GaAlAs IRED input and high-performance MOSFET output switches to enable clean, bounce-free AC/DC switching in telecom, metering, and industrial control systems.

For engineers reviewing the VOR2142B8T datasheet, VOR2142B8T pinout, VOR2142B8T application, or VOR2142B8T equivalent, this device delivers verified 5300 VRMS isolation, sub-500 µs turn-on/turn-off times, and SMD-8 packaging suitable for automated assembly in space-constrained, safety-critical signal routing designs.

Technical Context

The VOR2142B8T implements hybrid optocoupler architecture: an infrared LED drives two independent photodetector-MOSFET output stages, each with integrated gate drive and protection circuitry. Its dual-channel layout supports independent control of two isolated loads without crosstalk.

It operates across -40 °C to +100 °C ambient temperature, maintains ≤27 Ω RON up to 100 °C, and sustains 400 V peak load voltage with <500 nA off-state leakage at rated voltage - meeting UL 1577 and DIN EN 60747-5-5 (VDE 0884-5) safety standards.

Key Specifications

Pinout & Package

SMD-8 surface-mount package with 2.54 mm lead pitch, 9.80 mm × 6.65 mm body, and 0.79 mm nominal height; creepage/clearance ≥8 mm meets reinforced insulation requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TLP3548A and PS7142-2A, the VOR2142B8T uniquely balances dual-channel 400 V capability, SMD-8 manufacturability, and 22 Ω RON - making it optimal for high-density, safety-certified AC/DC switching where both channels must handle 140 mA at minimal self-heating.

Availability

VOR2142B8T is available at Aetrix Electronics and suitable for telecom switching, smart metering, security equipment, and industrial controls requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for VOR2142B8T 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, safety certification, and high-voltage isolation performance.

The VOR2142 series is part of Vishay's optically isolated solid-state relay product line, engineered specifically for replacing electromechanical relays in safety-critical AC/DC signal routing applications demanding long service life and zero contact wear.

FAQ

What is the maximum continuous load current per channel for VOR2142B8T at 85 °C ambient?

The VOR2142B8T supports 140 mA continuous DC load current per channel at 25 °C, but derates to approximately 100 mA per channel at 85 °C ambient temperature as shown in Figure 4 of the datasheet. This derating ensures junction temperature remains within the 125 °C limit under worst-case power dissipation conditions. The VOR2142B8T must be used with appropriate PCB copper area or thermal vias when operating near its thermal limits.

Does VOR2142B8T support AC load switching, and what is its zero-crossing behavior?

The VOR2142B8T supports both AC and DC load switching due to its back-to-back MOSFET output configuration, but it does not include zero-crossing detection circuitry. Switching occurs immediately upon input activation, resulting in non-zero-crossing turn-on. This enables precise timing control in ATE applications but may generate higher EMI during AC switching compared to zero-crossing TRIAC-based optocouplers. The VOR2142B8T is specified for clean bounce-free operation regardless of load type.

What is the minimum forward current required to reliably turn on VOR2142B8T at -40 °C?

At -40 °C, the VOR2142B8T requires a minimum forward current of approximately 0.35 mA to ensure reliable turn-on, based on the normalized forward current curve in Figure 7 of the datasheet. This represents a ~40 % increase over the 0.25 mA typical value at 25 °C. Designers should verify drive capability across the full temperature range, especially when using weak GPIO sources. The VOR2142B8T maintains guaranteed turn-on down to this level without external biasing.

Can VOR2142B8T replace mechanical relays in battery management system contactor control?

The VOR2142B8T is suitable for low-side precharge and auxiliary signal routing in BMS architectures, but not for main contactor switching due to its 140 mA load current limit and 400 V blocking rating. It can isolate voltage sense lines, thermistor inputs, or cell balancing enable signals where galvanic separation and bounce-free operation are critical. For main contactor control, higher-current SSRs or contactors remain necessary. The VOR2142B8T provides certified isolation and long-term reliability for these secondary BMS functions.

What safety certifications does VOR2142B8T hold, and what do they cover?

The VOR2142B8T is certified to UL 1577 (5300 VRMS, 1 min), cUL, and DIN EN 60747-5-5 (VDE 0884-5) for reinforced insulation. These approvals cover input-to-output withstand voltage, partial discharge limits, creepage/clearance distances (≥8 mm for SMD-8), and material tracking index (CTI = 175). The certifications apply to the full operating temperature range (-40 °C to +100 °C) and validate safe electrical insulation for use in double-insulated equipment. The VOR2142B8T meets the requirements for "safe electrical insulation" as defined in IEC 60747-5-5 §7.4.3.8.2.