ISO7721DR Digital isolator IC SOIC-8

ISO7721DR Digital Isolator IC (SOIC-8) provides robust galvanic isolation for digital communication lines. It ensures safe signal transfer between different voltage domains and protects sensitive circuits from high-voltage transients, making it a reliable solution for industrial, automotive, and power-supply applications.

Key Features:

• Dual-Channel Isolation: Two independent channels for flexible signal routing.
• High Isolation Voltage: Provides up to 3000 Vrms isolation protection for system safety.
• Low Propagation Delay: Typical delay around 10 ns supports high-speed digital interfaces.
• Noise Immunity: High common-mode transient immunity (CMTI) ensures stable operation in noisy environments.
• Fail-Safe Output: Designed to default to a safe logic state during power loss or fault conditions.
• Wide Supply Range: Operates from 2.25 V to 5.5 V, covering common logic families.

Technical Specifications:

• Channels: 2 (unidirectional, configurable input/output)
• Maximum Data Rate: Up to 100 Mbps
• Isolation Rating: 3000 Vrms (for 60 seconds)
• Propagation Delay: ~10 ns typical
• Power Supply Voltage (V_CC): 2.25 V to 5.5 V
• Quiescent Current: Low power consumption during normal operation
• Operating Temperature Range: −40 °C to +125 °C

Mechanical Specifications:

• Package Type: SOIC-8 (Small Outline Integrated Circuit)
• Leads: Gull-wing tin-plated leads for surface mounting
• Body Material: Molded epoxy with moisture sensitivity rating
• Mounting: Surface-mount compatible with standard SMT processes

Dimensions:

• Package Width: ~3.9 mm
• Package Length: ~4.9 mm
• Lead Pitch: 1.27 mm
• Package Height: ~1.5 mm

Pinout and Wiring:

• Pin 1: VCC1 – Power supply for side 1
• Pin 2: INA – Channel A input
• Pin 3: INB – Channel B input (direction depends on version)
• Pin 4: GND1 – Ground reference for side 1
• Pin 5: GND2 – Ground reference for side 2
• Pin 6: OUTB – Channel B output
• Pin 7: OUTA – Channel A output
• Pin 8: VCC2 – Power supply for side 2
• Wiring Note: Always power both VCC1 and VCC2 with isolated supplies. Connect GND1 and GND2 separately to maintain isolation barrier.

Datasheet Reference:

• Download the official Texas Instruments datasheet for ISO7721DR to review complete electrical data, timing diagrams, and layout guidelines.

Applications:

• Industrial Automation: Protects microcontrollers and PLCs from high-voltage equipment.
• Automotive Systems: Isolates communication between ECUs and power modules.
• Switch-Mode Power Supplies: Provides safe feedback isolation across primary and secondary sides.
• Communication Interfaces: Safeguards UART, SPI, or other digital buses in noisy environments.
• Medical Equipment: Ensures patient-side circuits remain isolated from mains power.

Equivalent Models:

• ISO7720: Dual-channel isolator with both channels in the same direction
• ADuM1201: Analog Devices alternative with similar isolation and speed
• Si8621: Silicon Labs isolator with comparable performance

Package Includes:

• 1 x ISO7721DR Digital Isolator IC (SOIC-8)