HCPL-573K Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL-573K is a 2-channel optoisolator with Darlington output manufactured by Broadcom Limited. This component provides 1500VDC isolation and is designed for applications requiring galvanic isolation in control and signal transmission circuits. The part is currently active in production with RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified based on matching electrical isolation characteristics, output configuration, and mechanical compatibility within the 8-DIP package format. Alternative models may be required due to inventory availability, compliance requirements, or specific application constraints.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL-573K
Manufacturer	Broadcom Limited
Category	Optoisolators
Number of Channels	2
Voltage - Isolation	1500VDC
Current Transfer Ratio (Min)	200% @ 5mA
Output Type	Darlington
Voltage - Output (Max)	20V
Current - Output / Channel	40mA
Vce Saturation (Max)	110mV
Operating Temperature	-55°C ~ 125°C
Package / Case	8-DIP (0.300", 7.62mm)
Product Status	Active
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the HCPL-573K are classified based on the following critical parameters that determine functional equivalence:

Primary Substitution Criteria:

Voltage - Isolation: 1500VDC (mandatory match)
Output Type: Darlington (mandatory match)
Package / Case: 8-DIP (0.300", 7.62mm) (mandatory match)
Current Transfer Ratio (Min): 200% @ 5mA (mandatory match)
Operating Temperature: -55°C ~ 125°C (mandatory match)

Secondary Consideration:

Number of Channels: The HCPL-573K features 2 channels. Single-channel variants (HCPL-5700, HCPL-5701) are functionally equivalent for applications requiring only one isolation channel but represent a reduced-feature alternative.

Compliance Variation:

The 5962-8978501PA is a parametric equivalent but is RoHS non-compliant, distinguishing it from the RoHS3-compliant main part and other substitutes.

Parameter Comparison

Parameter	HCPL-573K	HCPL-5730	5962-8978501PA	HCPL-5700	HCPL-5701
Number of Channels	2	2	2	1	1
Voltage - Isolation	1500VDC	1500VDC	1500VDC	1500VDC	1500VDC
Current Transfer Ratio (Min)	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA	200% @ 5mA
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	20V	20V	20V	20V	20V
Current - Output / Channel	40mA	40mA	40mA	40mA	40mA
Vce Saturation (Max)	110mV	110mV	110mV	110mV	110mV
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C	-55°C ~ 125°C
Package / Case	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Full 2-Channel Equivalents (Direct Substitutes):

HCPL-5730 is a direct parametric equivalent to the HCPL-573K. Both parts share identical electrical specifications, 2-channel configuration, and RoHS3 compliance. Selection between these parts is based on inventory availability and procurement lead times.

5962-8978501PA is a parametric equivalent with identical electrical and mechanical specifications but carries RoHS non-compliant status. This part is suitable only for applications where RoHS compliance is not a requirement or where legacy system compatibility is necessary.

Single-Channel Alternatives:

HCPL-5700 and HCPL-5701 are functionally equivalent single-channel variants. These parts match all critical electrical parameters and thermal specifications of the HCPL-573K but provide only one isolation channel. Selection of these parts is appropriate for applications requiring only single-channel isolation or where cost reduction through reduced channel count is acceptable.

Compliance Considerations:

All parts except 5962-8978501PA maintain RoHS3 compliance. For applications subject to RoHS directives or customer compliance requirements, HCPL-5730, HCPL-5700, and HCPL-5701 are preferred selections.

Frequently Asked Questions (FAQ)

Q: Can HCPL-5700 or HCPL-5701 be used as direct replacements for HCPL-573K?

A: HCPL-5700 and HCPL-5701 are functionally equivalent in terms of electrical performance and isolation characteristics but provide only one isolation channel instead of two. Direct substitution is possible only if the application circuit requires only single-channel isolation. PCB layout modifications may be necessary to accommodate the different pin configuration.

Q: What is the difference between HCPL-5730 and HCPL-573K?

A: HCPL-5730 and HCPL-573K are parametric equivalents with identical specifications across all measured parameters. Both are 2-channel Darlington optoisolators with 1500VDC isolation in 8-DIP packages. Selection between them is based on availability and procurement considerations.

Q: Is 5962-8978501PA suitable for new designs?

A: 5962-8978501PA is electrically and mechanically equivalent to HCPL-573K but is RoHS non-compliant. This part is suitable for applications where RoHS compliance is not required or for legacy system maintenance. For new designs subject to RoHS directives, HCPL-5730, HCPL-5700, or HCPL-5701 are recommended.

Q: Are all substitute parts available in the same packaging format?

A: All listed substitute parts are supplied in 8-DIP (0.300", 7.62mm) through-hole packages, matching the HCPL-573K package specification. No package conversion or adapter requirements are necessary for mechanical compatibility.

Q: What are the key parameters that must match for substitution?

A: Critical parameters for substitution are 1500VDC isolation voltage, Darlington output type, 200% minimum current transfer ratio at 5mA, 8-DIP package format, and -55°C to 125°C operating temperature range. Channel count (1 or 2) and RoHS compliance status are secondary considerations dependent on application requirements.

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