HCPL4502S Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL4502S 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 and integrated base connection. The part is currently obsolete, making equivalent substitutes necessary for new designs or production continuity. Substitute parts must maintain compatibility across isolation voltage, output type, channel configuration, and thermal operating range.

Key Parameters

Parameter	HCPL4502S
Manufacturer	onsemi
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
Mounting Type	Surface Mount
Package / Case	8-SMD, Gull Wing
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution for the HCPL4502S is determined by the following critical parameters:

Primary Substitution Criteria:

Output Type: Transistor with Base (required for pin-compatible replacement)
Number of Channels: 1 channel
Voltage - Isolation: Minimum 2500Vrms (equal or higher isolation voltage acceptable)
Current Transfer Ratio: 19% minimum @ 16mA
Voltage - Output (Max): 20V
Current - Output / Channel: 8mA
Mounting Type: Surface Mount
Package / Case: 8-SMD, Gull Wing

Acceptable Substitutes: Parts meeting all primary criteria are direct substitutes. Parts with higher isolation voltage (3750Vrms or 5000Vrms) are acceptable as they exceed the minimum requirement. Parts with different output types (Transistor without Base) or different package configurations are not direct substitutes.

Parameter Comparison

Part Number	Manufacturer	Voltage - Isolation	Output Type	CTR Min @ 16mA	CTR Max @ 16mA	Voltage - Output (Max)	Current - Output	Operating Temp	Package	Product Status
HCPL4502S	onsemi	2500Vrms	Transistor with Base	19%	50%	20V	8mA	-55°C ~ 100°C	8-SMD, Gull Wing	Obsolete
HCPL4503SM	onsemi	5000Vrms	Transistor with Base	19%	50%	20V	8mA	-40°C ~ 100°C	8-SMD, Gull Wing	Active
HCPL-4562-520E	Broadcom Limited	5000Vrms	Transistor with Base	—	—	20V	8mA	-40°C ~ 85°C	8-SMD, Gull Wing	Active
HCPL-4562-300E	Broadcom Limited	3750Vrms	Transistor with Base	—	—	20V	8mA	-40°C ~ 85°C	8-SMD, Gull Wing	Active
HCPL-4562-500E	Broadcom Limited	3750Vrms	Transistor with Base	—	—	20V	8mA	-40°C ~ 85°C	8-SMD, Gull Wing	Active

Engineering Selection Recommendations

Primary Recommendation: HCPL4503SM

The HCPL4503SM is the direct functional equivalent with active product status. It maintains identical output type (Transistor with Base), channel count, output voltage, and output current specifications. The isolation voltage is increased to 5000Vrms, providing superior performance margin. Current transfer ratio specifications are identical. The operating temperature range is -40°C to 100°C, which covers the original -55°C to 100°C range except at the lower extreme. This part is manufactured by onsemi, the original manufacturer, ensuring design continuity.

Secondary Recommendations: HCPL-4562 Series (300E, 500E, 520E)

The HCPL-4562 series parts maintain Transistor with Base output type and meet isolation voltage requirements (3750Vrms to 5000Vrms). All variants are RoHS3 compliant and carry active product status. Operating temperature range is -40°C to 85°C, which is narrower than the original specification. These parts are manufactured by Broadcom Limited and provide functional substitution with higher isolation ratings.

Compliance Considerations:

HCPL4503SM carries ROHS3 compliance status. HCPL-4562 series parts are ROHS3 compliant. All recommended substitutes maintain REACH Unaffected status and EAR99 ECCN classification matching the original part.

Frequently Asked Questions (FAQ)

Q: Can I use HCPL-4502-300E or HCPL-4502-320E as substitutes?

A: No. These parts have Transistor output type without Base connection, making them incompatible with designs requiring base drive capability. The HCPL4502S specifically includes base output for external base drive control.

Q: What is the minimum isolation voltage acceptable for substitution?

A: The minimum acceptable isolation voltage is 2500Vrms, matching the original HCPL4502S specification. Higher isolation voltages (3750Vrms, 5000Vrms) are acceptable and provide additional safety margin.

Q: Does the HCPL4503SM work at -55°C like the original part?

A: The HCPL4503SM operating temperature range is -40°C to 100°C. If operation below -40°C is required, the original HCPL4502S specification cannot be fully matched by active substitutes in this comparison set.

Q: Are HCPL-4562 parts suitable for high-speed switching applications?

A: The HCPL-4562 series does not provide turn-on/turn-off time specifications in the available data. The HCPL4503SM specifies 250ns turn-on and 260ns turn-off times, suitable for moderate-speed applications.

Q: What is the difference between HCPL-4562-300E, -500E, and -520E?

A: These variants differ in packaging format (Tube, Tape & Reel, Cut Tape) and isolation voltage rating. The -300E and -500E are rated 3750Vrms, while the -520E is rated 5000Vrms. Electrical specifications are identical across variants.

Q: Can I substitute parts with different package types?

A: All recommended substitutes maintain 8-SMD, Gull Wing surface mount packaging. Package type must remain consistent for PCB compatibility.

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