HCPL-0708 Equivalent & Substitute Parts

Part Overview

The HCPL-0708 is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed digital isolation applications requiring 3750Vrms isolation voltage. This component features a push-pull, totem pole output configuration with a 15MBd data rate and 10kV/µs common mode transient immunity. The device is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

HCPL-0708

Broadcom LimitedIn Stock: 1893HCPL-0708 Datasheet

Current PartRFQ

FODM8071

onsemiIn Stock: 1528FODM8071 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HCPL-0708 is determined by the following critical parameters:

• Isolation Voltage: Must maintain 3750Vrms minimum isolation rating
• Output Configuration: Must provide push-pull, totem pole output topology
• Number of Channels: Single channel requirement
• Input Type: DC input compatibility
• Common Mode Transient Immunity: Minimum 10kV/µs performance
• Data Rate: Minimum 15MBd capability
• Supply Voltage Range: Must operate within or encompass 4.5V ~ 5.5V
• Operating Temperature Range: Must support -40°C ~ 100°C minimum
• Mounting Type: Surface mount configuration required

The FODM8071 from onsemi meets all mandatory substitution criteria while offering enhanced performance characteristics in several parameters.

Parameter Comparison

Engineering Selection Recommendations

The FODM8071 qualifies as a functional substitute for the HCPL-0708 based on equivalence in isolation voltage, output topology, channel count, and input type. The FODM8071 is an active product with current manufacturing support, addressing the obsolescence status of the HCPL-0708.

The FODM8071 demonstrates superior performance in common mode transient immunity (20kV/µs versus 10kV/µs), output current capability (10mA versus 2mA), propagation delay (55ns versus 60ns), and rise/fall time characteristics. The extended operating temperature range (-40°C ~ 110°C) and expanded supply voltage range (3V ~ 5.5V) provide additional design flexibility.

The FODM8071 achieves ROHS3 compliance, whereas the HCPL-0708 is RoHS non-compliant. Both components maintain identical isolation voltage ratings and DC input/push-pull output configurations required for direct functional replacement.

Package geometry differs between the two devices: the HCPL-0708 uses an 8-SOIC package (0.154" width), while the FODM8071 uses a 6-SOIC package (0.173" width) with 5 leads. PCB layout modifications are required for physical implementation.

Frequently Asked Questions (FAQ)

Q: Can the FODM8071 directly replace the HCPL-0708 without circuit modifications?

A: The FODM8071 maintains functional equivalence in isolation voltage, output topology, and channel configuration. However, package geometry differs (8-SOIC versus 6-SOIC with 5 leads), requiring PCB layout redesign. The expanded supply voltage range (3V ~ 5.5V) and superior performance characteristics are compatible with applications designed for the HCPL-0708.

Q: What are the key differences in electrical performance?

A: The FODM8071 provides enhanced common mode transient immunity (20kV/µs versus 10kV/µs), higher output current (10mA versus 2mA), faster propagation delay (55ns versus 60ns), and significantly faster rise/fall times (5.8ns/5.3ns versus 20ns/25ns). These improvements represent performance enhancements rather than limitations.

Q: Are there compliance differences between these components?

A: The FODM8071 is ROHS3 compliant, while the HCPL-0708 is RoHS non-compliant. Both components are REACH unaffected and classified under ECCN EAR99. The FODM8071's active product status ensures ongoing compliance support and manufacturing availability.

Q: What package considerations apply to substitution?

A: The HCPL-0708 uses an 8-SOIC package (0.154" width), while the FODM8071 uses a 6-SOIC package (0.173" width) with 5 leads. Pin count and spacing differ, necessitating PCB footprint redesign. Verify pinout compatibility with application schematics before implementation.

Q: Is the FODM8071 suitable for new designs?

A: Yes. The FODM8071 is an active product with current manufacturing support. Its enhanced performance characteristics, expanded operating ranges, and ROHS3 compliance make it suitable for new applications requiring 3750Vrms isolation with push-pull output topology.