HCPL4502SV Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL4502SV is a 2500Vrms optoisolator transistor with base output manufactured by onsemi in 8-SMD surface mount packaging. This component provides galvanic isolation for DC input signals with transistor output capability. The part is currently obsolete, making equivalent substitutes necessary for new designs or production continuity. Substitute parts must maintain compatibility across isolation voltage, channel configuration, output type, and mounting specifications.

Key Parameters

Parameter	HCPL4502SV
Manufacturer	onsemi
Number of Channels	1
Voltage - Isolation	2500Vrms
Output Type	Transistor with Base
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	8-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the HCPL4502SV is determined by the following critical parameters:

Mandatory Compatibility Criteria:

Single channel configuration (1 channel)
Transistor with base output type
8-SMD surface mount package with gull wing leads
DC input type
Maximum output voltage of 20V
Maximum output current of 8mA per channel
Isolation voltage rating of 2500Vrms or higher

Acceptable Variation:

Isolation voltage may exceed 2500Vrms (higher ratings are compatible)
Current transfer ratio may differ within the specified ranges
Operating temperature range may be narrower or wider
Turn-on/turn-off timing may vary
Forward voltage and forward current specifications may differ within rated limits

The substitute parts listed below meet all mandatory criteria and represent direct functional equivalents for the obsolete HCPL4502SV.

Parameter Comparison

Parameter	HCPL4502SV	HCPL4503SVM	HCPL-4504#300	HCPL-4562-300E	HCPL-4562-500E	HCPL-4562-520E	HCPL-J454-400E	HCPL-J454-600E
Manufacturer	onsemi	Fairchild Semiconductor	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Number of Channels	1	1	1	1	1	1	1	1
Voltage - Isolation	2500Vrms	5000Vrms	3750Vrms	3750Vrms	3750Vrms	5000Vrms	3750Vrms	3750Vrms
Output Type	Transistor with Base	Transistor with Base	Transistor	Transistor with Base	Transistor with Base	Transistor with Base	Transistor	Transistor
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	25% @ 16mA	—	—	—	19% @ 16mA	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA	50% @ 16mA	60% @ 16mA	—	—	—	60% @ 16mA	60% @ 16mA
Voltage - Output (Max)	20V	20V	20V	20V	20V	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA
Operating Temperature	-55°C ~ 100°C	-40°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 100°C	-55°C ~ 100°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing	8-SMD, Gull Wing
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitutes (Transistor with Base Output):

HCPL4503SVM and HCPL-4562-520E are the most direct functional replacements. Both maintain transistor with base output configuration and are in active production status. HCPL4503SVM provides 5000Vrms isolation with ROHS3 compliance. HCPL-4562-520E also offers 5000Vrms isolation with ROHS3 compliance and is available in tape and reel packaging for production volumes.

HCPL-4562-300E and HCPL-4562-500E provide 3750Vrms isolation with transistor with base output and ROHS3 compliance. These parts are suitable where the higher isolation voltage of the HCPL4502SV is not required.

Alternative Substitutes (Transistor Output without Base):

HCPL-4504#300 and HCPL-J454-400E/600E provide transistor output without base connection. These parts are functionally compatible for applications where base control is not required. HCPL-4504#300 offers 3750Vrms isolation and is available in active production. HCPL-J454-400E and HCPL-J454-600E both provide 3750Vrms isolation with ROHS3 compliance and extended temperature range matching the original part.

Compliance Considerations:

All recommended substitutes except HCPL-4504#300 are ROHS3 compliant. HCPL-4504#300 is RoHS non-compliant and should be selected only where RoHS compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4504#300 or HCPL-J454-400E replace HCPL4502SV if the base connection is not used in my circuit?

A: Yes. These parts provide equivalent isolation voltage, output current, and package configuration. The absence of a base connection does not prevent substitution if your circuit design does not require base control. However, verify that your PCB layout and schematic accommodate the different pin configuration.

Q: What is the difference between HCPL4503SVM and HCPL-4562-520E?

A: Both parts provide 5000Vrms isolation and transistor with base output in 8-SMD gull wing packaging. HCPL4503SVM is manufactured by Fairchild Semiconductor, while HCPL-4562-520E is manufactured by Broadcom Limited. HCPL-4562-520E is available in tape and reel packaging for automated assembly. Select based on supplier availability and packaging requirements.

Q: Why do some substitute parts have lower isolation voltage than HCPL4502SV?

A: Parts with 3750Vrms isolation (HCPL-4504#300, HCPL-4562-300E, HCPL-4562-500E, HCPL-J454-400E, HCPL-J454-600E) exceed the minimum isolation requirement of 2500Vrms and are functionally compatible. Higher isolation voltage provides additional safety margin and is acceptable for direct substitution.

Q: Are there temperature range differences I should consider?

A: HCPL4502SV operates from -55°C to 100°C. HCPL4503SVM, HCPL-4562-300E, HCPL-4562-500E, and HCPL-4562-520E operate from -40°C to 85°C, which is narrower. If your application requires the full -55°C to 100°C range, select HCPL-4504#300, HCPL-J454-400E, or HCPL-J454-600E.

Q: What does ROHS3 compliance mean for my selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. If your application or market requires RoHS compliance, select from HCPL4503SVM, HCPL-4562-300E, HCPL-4562-500E, HCPL-4562-520E, HCPL-J454-400E, or HCPL-J454-600E. HCPL-4504#300 is RoHS non-compliant.

Q: Can I use HCPL-4562-300E or HCPL-4562-500E instead of HCPL-4562-520E?

A: All three parts (HCPL-4562-300E, HCPL-4562-500E, HCPL-4562-520E) are electrically equivalent with 3750Vrms isolation and transistor with base output. The primary difference is packaging: HCPL-4562-520E is supplied in tape and reel format suitable for high-volume production, while HCPL-4562-300E and HCPL-4562-500E may have different packaging options. Select based on your assembly process requirements.

Q: Is the current transfer ratio difference between parts significant?

A: Current transfer ratio specifications vary among substitutes. HCPL4502SV specifies 19% to 50% at 16mA. HCPL-4504#300 and HCPL-J454-400E/600E specify 19% to 60%, providing higher maximum transfer ratio. HCPL-4562 series parts do not specify current transfer ratio in the provided data. Verify your circuit design accommodates the specified transfer ratio range for your selected substitute.

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