FOD270LSD Equivalent & Substitute Parts

Part Overview

The FOD270LSD is an optoisolator with Darlington output and base connection, manufactured by onsemi. It provides 5000Vrms isolation with a single channel configuration in an 8-SMD gull wing package. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across isolation voltage, output type, channel count, and thermal operating range.

Substiute Parts

FOD270LSD

onsemiIn Stock: 1000FOD270LSD Datasheet

Current PartRFQ

HCPL-270L-500E

Broadcom LimitedIn Stock: 841HCPL-270L-500E Datasheet

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HCPL-4701#300

Broadcom LimitedIn Stock: 927HCPL-4701#300 Datasheet

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HCPL-4701-320E

Broadcom LimitedIn Stock: 1045HCPL-4701-320E Datasheet

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HCPL-4701-360E

Broadcom LimitedIn Stock: 892HCPL-4701-360E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FOD270LSD is determined by the following critical parameters:

Primary Criteria (Must Match):

• Number of Channels: 1
• Output Type: Darlington with Base
• Package / Case: 8-SMD, Gull Wing
• Voltage - Isolation: 5000Vrms (minimum requirement)
• Current - Output / Channel: 60mA (minimum requirement)
• Moisture Sensitivity Level: 1 (Unlimited)

Secondary Criteria (Functional Compatibility):

• Input Type: DC
• Current Transfer Ratio range compatibility
• Operating Temperature range (substitute must cover or exceed the original range)

The substitute parts identified below meet these criteria with active product status and current manufacturing availability.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: HCPL-4701-320E

The HCPL-4701-320E is the closest functional equivalent to the FOD270LSD. It maintains the 5000Vrms isolation voltage requirement, Darlington with Base output configuration, and 60mA output current. The part is manufactured by Broadcom Limited with active product status and ROHS3 compliance. Operating temperature range is 0°C to 70°C, which covers the standard industrial range but does not extend to the original -40°C lower limit. Current Transfer Ratio specifications exceed the original part, providing improved performance margin.

Secondary Substitutes: HCPL-4701-360E and HCPL-4701#300

Both parts provide Darlington with Base output and 60mA current capability with active product status. HCPL-4701-360E offers ROHS3 compliance, while HCPL-4701#300 is RoHS non-compliant. Both operate at 3750Vrms isolation, which is lower than the original 5000Vrms specification. These parts are suitable only for applications where 3750Vrms isolation meets system requirements.

Alternative Substitute: HCPL-270L-500E

The HCPL-270L-500E provides 3750Vrms isolation with Darlington output (without base connection). This part lacks the base output feature of the original FOD270LSD and operates at reduced isolation voltage. It is suitable only for applications where base connection is not required and 3750Vrms isolation is acceptable. ROHS3 compliance is confirmed.

Compliance Considerations:

For new designs requiring RoHS compliance, HCPL-4701-320E and HCPL-4701-360E are ROHS3 compliant. HCPL-4701#300 does not meet RoHS requirements. All substitute parts maintain MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4701-320E directly replace FOD270LSD in all applications?

A: HCPL-4701-320E is functionally compatible for applications operating within 0°C to 70°C. If your application requires operation below 0°C or above 70°C, the reduced operating temperature range must be evaluated against system requirements. All other electrical parameters are compatible or exceed the original specification.

Q: What is the difference between HCPL-4701-320E and HCPL-4701-360E?

A: Both parts are electrically identical with 5000Vrms and 3750Vrms isolation respectively. HCPL-4701-320E maintains 5000Vrms isolation matching the original FOD270LSD. HCPL-4701-360E operates at 3750Vrms. Both have identical electrical performance characteristics and ROHS3 compliance.

Q: Why does HCPL-270L-500E lack a base connection?

A: HCPL-270L-500E is configured with Darlington output only, without the base pin connection present on FOD270LSD. This part is suitable only for applications that do not require base control functionality.

Q: Are all substitute parts available in the same package?

A: All substitute parts use 8-SMD gull wing packaging, maintaining mechanical compatibility with FOD270LSD PCB layouts.

Q: What is the impact of lower isolation voltage on HCPL-4701#300 and HCPL-270L-500E?

A: These parts operate at 3750Vrms isolation versus the original 5000Vrms. They are suitable only for applications where system isolation requirements do not exceed 3750Vrms. Verify isolation voltage requirements before selection.

Q: Which substitute part has the best compliance status?

A: HCPL-4701-320E and HCPL-4701-360E both carry ROHS3 compliance certification. HCPL-4701#300 is RoHS non-compliant and should not be used in applications requiring RoHS compliance.