SFH6705 Equivalent & Substitute Parts

Part Overview

The SFH6705 is a logic output optoisolator manufactured by Vishay Semiconductor Opto Division, designed for galvanic isolation applications requiring 5300Vrms isolation voltage with open collector output configuration. This component operates at 5MBd data rate with 1kV/µs common mode transient immunity in an 8-DIP through-hole package.

The SFH6705 is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for legacy systems or new designs requiring comparable isolation performance.

Substiute Parts

SFH6705

Vishay Semiconductor Opto DivisionIn Stock: 2233SFH6705 Datasheet

Current PartRFQ

HCPL-261A-020E

Broadcom LimitedIn Stock: 997HCPL-261A-020E Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SFH6705 optoisolator is determined by the following critical parameters:

• Isolation Voltage: Minimum 5000Vrms required to maintain equivalent galvanic isolation performance
• Number of Channels: Single channel configuration (1 channel)
• Output Configuration: Open collector topology for logic-level switching applications
• Common Mode Transient Immunity: Minimum 1kV/µs CMTI for noise immunity in high-speed switching environments
• Package Compatibility: 8-DIP through-hole form factor for direct PCB mounting
• Operating Temperature Range: -40°C to 85°C industrial temperature specification
• Supply Voltage Range: Compatible with 4.5V to 15V supply rails

The HCPL-261A-020E from Broadcom Limited meets these substitution criteria while offering enhanced performance characteristics in data rate and propagation delay specifications.

Parameter Comparison

Engineering Selection Recommendations

The HCPL-261A-020E is a direct substitute for the obsolete SFH6705 based on the following engineering criteria:

Compliance and Certification: Both components maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with current manufacturing and environmental standards.

Product Status: The HCPL-261A-020E carries active product status with established supply chain availability, addressing the obsolescence of the SFH6705.

Electrical Compatibility: The HCPL-261A-020E meets or exceeds the critical isolation voltage requirement (5000Vrms vs. 5300Vrms), maintains identical common mode transient immunity (1kV/µs), and provides enhanced output current capability (50 mA vs. 25 mA) and faster propagation delay performance (100ns vs. 300ns).

Physical Compatibility: Identical 8-DIP through-hole package and mounting type enable direct PCB layout compatibility without redesign.

Supply Voltage Consideration: The HCPL-261A-020E operates within a narrower supply voltage range (4.5V ~ 5.5V) compared to the SFH6705 (4.5V ~ 15V). Design verification is required if the original application utilizes supply voltages above 5.5V.

Frequently Asked Questions (FAQ)

Q: Can the HCPL-261A-020E directly replace the SFH6705 without PCB modifications?

A: Yes, the HCPL-261A-020E is pin-compatible and uses the identical 8-DIP package footprint. No PCB layout changes are required for physical substitution.

Q: What is the significance of the Schottky Clamped output in the HCPL-261A-020E?

A: The Schottky clamped output configuration reduces propagation delay and improves switching speed performance compared to standard open collector outputs, contributing to the faster 100ns propagation delay specification.

Q: Is the reduced isolation voltage (5000Vrms vs. 5300Vrms) acceptable for substitution?

A: The HCPL-261A-020E isolation voltage of 5000Vrms meets industry-standard high-voltage isolation requirements. Substitution is acceptable for applications designed within this isolation specification. Design review is required if the original application specifically requires 5300Vrms isolation margin.

Q: What design consideration applies to the narrower supply voltage range of the HCPL-261A-020E?

A: The HCPL-261A-020E operates within 4.5V to 5.5V supply range, compared to the SFH6705 range of 4.5V to 15V. If the original design uses supply voltages exceeding 5.5V, the HCPL-261A-020E is not suitable without additional voltage regulation circuitry.

Q: Are there performance advantages to using the HCPL-261A-020E?

A: The HCPL-261A-020E provides enhanced data rate capability (10MBd vs. 5MBd), faster propagation delay (100ns vs. 300ns), and higher output current (50 mA vs. 25 mA). These improvements support higher-speed signal isolation applications while maintaining backward compatibility with lower-speed designs.

Q: What certifications and compliance standards apply to both components?

A: Both the SFH6705 and HCPL-261A-020E are ROHS3 compliant, REACH unaffected, and classified under ECCN EAR99 with HTSUS code 8541.49.8000. Both maintain MSL 1 (unlimited) moisture sensitivity level.