HCPL4502 Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL4502 is a 2500Vrms optoisolator transistor with base output in 8-DIP packaging, manufactured by onsemi. This component provides galvanic isolation for DC input signals with transistor output capability. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Manufacturer	onsemi
Part Number	HCPL4502
Category	Optoisolators
Voltage - Isolation	2500Vrms
Number of Channels	1
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
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the HCPL4502 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Isolation voltage rating (minimum 2500Vrms for direct substitution)
Output type (transistor with base configuration)
Current transfer ratio range (19% to 50% @ 16mA)
Maximum output voltage (20V)
Output current per channel (8mA)
Input type (DC)

Mechanical Compatibility Requirements:

Package type (8-DIP, 0.300", 7.62mm)
Mounting type (Through Hole)
Pin count and pinout compatibility

Operational Requirements:

Operating temperature range (-55°C to 100°C minimum)

Substitute parts are grouped into three categories based on isolation voltage: parts with 2500Vrms isolation (direct equivalents), parts with 3750Vrms isolation (higher rated), and parts with 5000Vrms isolation (highest rated). All maintain the same output configuration, package, and electrical performance envelope.

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Output Type	CTR Min @ 16mA	CTR Max @ 16mA	Vout Max	Iout / Channel	Temp Range	Package	Status
HCPL4502	onsemi	2500Vrms	Transistor w/ Base	19%	50%	20V	8mA	-55 to 100°C	8-DIP	Obsolete
HCPL4503M	onsemi	5000Vrms	Transistor w/ Base	19%	50%	20V	8mA	-40 to 100°C	8-DIP	Active
HCPL-4502	Broadcom Limited	3750Vrms	Transistor	19%	50%	20V	8mA	-55 to 100°C	8-DIP	Active
HCPL-4502-000E	Broadcom Limited	3750Vrms	Transistor	19%	50%	20V	8mA	-55 to 100°C	8-DIP	Active
HCPL-4502-020E	Broadcom Limited	5000Vrms	Transistor	19%	50%	20V	8mA	-55 to 100°C	8-DIP	Active
HCPL-4503	Broadcom Limited	3750Vrms	Transistor	19%	50%	20V	8mA	-55 to 100°C	8-DIP	Active
HCPL-4503-000E	Broadcom Limited	3750Vrms	Transistor	19%	50%	20V	8mA	-55 to 100°C	8-DIP	Active
HCPL-4503-020E	Broadcom Limited	5000Vrms	Transistor	19%	50%	20V	8mA	-55 to 100°C	8-DIP	Active
HCPL-4562	Broadcom Limited	3750Vrms	Transistor w/ Base	—	—	20V	8mA	-40 to 85°C	8-DIP	Active
HCPL-4562-000E	Broadcom Limited	3750Vrms	Transistor w/ Base	—	—	20V	8mA	-40 to 85°C	8-DIP	Active
HCPL-4562-020E	Broadcom Limited	5000Vrms	Transistor w/ Base	—	—	20V	8mA	-40 to 85°C	8-DIP	Active

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

HCPL4503M and HCPL-4502-020E are the preferred active substitutes. Both provide 5000Vrms isolation, exceeding the original 2500Vrms specification, and maintain identical electrical performance parameters. HCPL4503M is manufactured by onsemi (original manufacturer) and carries ROHS3 compliance. HCPL-4502-020E is manufactured by Broadcom Limited with ROHS3 compliance and active product status.

Secondary Substitutes (Acceptable for Most Applications):

HCPL-4502, HCPL-4502-000E, HCPL-4503, and HCPL-4503-000E provide 3750Vrms isolation with identical electrical performance. These parts maintain the full operating temperature range (-55°C to 100°C) and are all ROHS3 compliant with active status. HCPL-4502-000E and HCPL-4503-000E offer the largest inventory availability.

Conditional Substitutes (Temperature-Dependent):

HCPL-4562, HCPL-4562-000E, and HCPL-4562-020E maintain transistor-with-base output configuration but operate within -40°C to 85°C temperature range. These are suitable only for applications not requiring the full -55°C lower temperature limit. HCPL-4562-020E provides 5000Vrms isolation with ROHS3 compliance.

Compliance Considerations:

All recommended substitutes carry REACH Unaffected status and EAR99 ECCN classification, matching the original part. ROHS3 compliance is available across all active substitutes. The original HCPL4502 carries MSL Level 1 (Unlimited), consistent with all substitute options.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4502 and HCPL-4503 be used interchangeably with HCPL4502?

A: HCPL-4502 and HCPL-4503 (Broadcom Limited versions) provide 3750Vrms isolation versus the original 2500Vrms. Both maintain identical current transfer ratio, output voltage, output current, and operating temperature range. They are electrically compatible substitutes with higher isolation rating. Pin configuration and package dimensions are identical.

Q: What is the difference between HCPL-4502-000E and HCPL-4502-020E?

A: Both are Broadcom Limited products in 8-DIP packaging with identical electrical performance. The primary difference is isolation voltage: HCPL-4502-000E provides 3750Vrms while HCPL-4502-020E provides 5000Vrms. Both carry ROHS3 compliance and active product status.

Q: Why do HCPL-4562 variants show no current transfer ratio specification?

A: The HCPL-4562 series does not provide published CTR specifications in the available data. While maintaining the same output configuration and package, these parts should be selected only when CTR specification is not critical to circuit operation.

Q: Is HCPL4503M suitable for applications requiring -55°C operation?

A: HCPL4503M operates from -40°C to 100°C, which does not meet the full -55°C lower limit of the original HCPL4502. For applications requiring -55°C operation, select HCPL-4502, HCPL-4502-000E, HCPL-4502-020E, HCPL-4503, or HCPL-4503-000E.

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

A: All substitute parts use 8-DIP (0.300", 7.62mm) through-hole packaging, identical to the original HCPL4502. Pinout compatibility is maintained across all listed substitutes.

Q: What is the inventory status of recommended substitutes?

A: HCPL-4503-000E has the highest inventory (15,885 pcs), followed by HCPL4503M (6,080 pcs) and HCPL-4502 (5,800 pcs). All recommended primary and secondary substitutes maintain active product status with new original stock availability.

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