Information of VOM1271T Optically Isolated MOSFET Driver

Basic Overview

• Product Type: Stand-alone optically isolated MOSFET driver with integrated fast turn-off (solid-state relay)
• Manufacturer: Vishay Semiconductors (Vishay Intertechnology, Inc.)
• Document Reference: 83469 (Rev. 1.9, 08-Aug-2023)
• Core Function: Provides isolated gate driving for MOSFETs without external power supplies, drawing operating current from the input LED; integrates rapid turn-off circuitry for enhanced switching speed
• Key Features: RoHS compliant, halogen-free, logic-compatible input, 3750 VRMS isolation voltage, small SOP-4 package, high reliability, integrated turn-off circuit
• Key Identifiers:

Core Specifications

1. Absolute Maximum Ratings (Tamb=25°C)

2. Electrical Characteristics (Tamb=25°C)

3. Switching Characteristics (Tamb=25°C)

4. Safety and Insulation Ratings

Functional Details

1. Core Functionality

• Power Supply Independence: Obtains all internal circuitry current from the input LED (no external VCC/VDD required), saving space and cost.
• Integrated Turn-Off Circuit: Eliminates external components for fast turn-off, reducing switching time.
• Optical Isolation: Provides 3750 VRMS isolation between input (low-voltage) and output (high-voltage) sides, ensuring safety in isolated applications.
• Logic Compatibility: Input is compatible with standard logic signals for easy integration into digital systems.

2. Typical Characteristics

• Open Circuit Voltage (VOC): Increases with LED forward current (8.1V@5mA to 8.9V@30mA) and varies slightly with temperature.
• Short Circuit Current (ISC): Proportional to LED current (7μA@5mA to 47μA@30mA) and stable across temperature ranges.
• Switching Speed: Turn-on/turn-off times decrease with higher LED forward current (optimized at IF=20mA).
• LED Forward Voltage (VF): Stable across operating current and temperature ranges (1.2V–1.6V@IF=10mA).

Package and Pin Configuration

1. Package Specifications (SOP-4)

2. Pin Identification

• Pin 1: Input LED Anode (marked with dimple for identification)
• Pin 2: Input LED Cathode
• Pin 3: Output (MOSFET Gate Drive)
• Pin 4: Output (Return Path)
• Note: Refer to Vishay’s application diagrams for specific wiring in single or bidirectional MOSFET driver setups.

Packaging and Handling

1. Tape and Reel Specifications

2. Soldering Requirements (Pb-Free)

3. Storage and Handling

• Storage Conditions: Tamb<30°C, RH<60% (unlimited floor life due to MSL 1)
• ESD Protection: Handle with ESD-safe practices (HBM Class 2 sensitivity)
• Moisture Sensitivity: No bake required before soldering (MSL 1)

Application Guidelines

1. Typical Applications

• High-side MOSFET drivers
• Solid-state relays
• Floating power supplies
• Power control systems
• Data acquisition equipment
• ATE (Automatic Test Equipment)
• Isolated solenoid drivers
• Isolated high-current/high-voltage relay drivers

2. Key Application Notes

• Use in applications requiring galvanic isolation between control (low-voltage) and power (high-voltage) circuits.
• Ensure input LED current (IF) is within 5mA–30mA for optimal performance (VOC and ISC stability).
• Avoid exceeding maximum isolation voltage ratings to maintain safety compliance.
• Refer to Vishay’s SPICE models for circuit simulation and optimization.
• Suitable for "safe electrical insulation" only within specified safety ratings (supplemental protective circuits may be required).