HCPL2503 Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL2503 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 obsolete, making equivalent substitutes necessary for new designs or component replacement in legacy systems. Substitute parts must maintain compatibility across isolation voltage, output type, package format, and electrical performance parameters.

Key Parameters

Parameter	HCPL2503
Manufacturer	onsemi
Product Status	Obsolete
Isolation Voltage	2500Vrms
Number of Channels	1
Output Type	Transistor with Base
Input Type	DC
Package / Case	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole
Operating Temperature	-55°C ~ 100°C
Current Transfer Ratio (Min)	12% @ 16mA
Voltage - Output (Max)	20V
Current - Output / Channel	8mA

Substitute Part Grouping Explanation

Substitution for the HCPL2503 is determined by the following criteria:

Primary Compatibility Requirements:

Package format: 8-DIP (0.300", 7.62mm) through-hole mounting
Output type: Transistor with base output
Input type: DC
Isolation voltage: Equal to or greater than 2500Vrms
Output voltage rating: Minimum 20V
Output current: Minimum 8mA per channel
Single channel configuration
Operating temperature range: Must encompass or match -55°C ~ 100°C

Substitution Logic: Parts meeting all primary requirements are classified as direct substitutes. The HCPL2503 operates at 2500Vrms isolation; substitute parts with higher isolation ratings (3750Vrms, 5000Vrms, 5300Vrms) provide enhanced isolation margin and are electrically compatible. Current transfer ratio, forward voltage, and switching times are secondary parameters that may vary between substitutes while maintaining functional equivalence.

Parameter Comparison

Parameter	HCPL2503	HCPL-2502	HCPL-4562	HCPL-4562-000E	HCPL-4562-020E	HCPL-4562-060E	SFH6345
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Vishay Semiconductor Opto Division
Product Status	Obsolete	Active	Active	Active	Active	Active	Active
Isolation Voltage	2500Vrms	3750Vrms	3750Vrms	3750Vrms	5000Vrms	3750Vrms	5300Vrms
Number of Channels	1	1	1	1	1	1	1
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor with Base	Transistor
Input Type	DC	DC	DC	DC	DC	DC	DC
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)	8-DIP (0.300", 7.62mm)	8-DIP (0.300", 7.62mm)
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Voltage - Output (Max)	20V	20V	20V	20V	20V	20V	25V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA	8mA
Current Transfer Ratio (Min)	12% @ 16mA	15% @ 16mA	—	—	—	—	19% @ 16mA
Voltage - Forward (Vf) (Typ)	1.45V	1.5V	1.3V	1.3V	1.3V	1.3V	1.33V
Current - DC Forward (If) (Max)	25 mA	25 mA	12 mA	12 mA	12 mA	12 mA	25 mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-55°C ~ 100°C
RoHS Status	—	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

HCPL-2502 (Broadcom Limited): Active product with 3750Vrms isolation, matching the original operating temperature range of -55°C ~ 100°C. Provides higher isolation margin than the obsolete HCPL2503. RoHS non-compliant status should be evaluated against design requirements.

HCPL-4562, HCPL-4562-000E, HCPL-4562-060E (Broadcom Limited): Active products with 3750Vrms isolation and ROHS3 compliance. Operating temperature range is -40°C ~ 85°C, which is narrower than the original part. These variants are suitable for applications not requiring the full -55°C lower temperature limit. HCPL-4562-000E and HCPL-4562-060E are supplied in tube packaging.

HCPL-4562-020E (Broadcom Limited): Active product with 5000Vrms isolation and ROHS3 compliance. Provides the highest isolation voltage among Broadcom substitutes. Operating temperature range is -40°C ~ 85°C. Tube packaging supplied.

SFH6345 (Vishay Semiconductor Opto Division): Active product with 5300Vrms isolation, matching the original operating temperature range of -55°C ~ 100°C. ROHS3 compliant. Output voltage rating is 25V, exceeding the original 20V specification. Current transfer ratio of 19% @ 16mA exceeds the original 12% minimum.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4562 series parts replace HCPL2503 in all applications?

A: HCPL-4562 series parts are electrically compatible with HCPL2503 for package, output type, and isolation voltage requirements. However, the operating temperature range is -40°C ~ 85°C versus the original -55°C ~ 100°C. Applications requiring operation below -40°C or above 85°C must use HCPL-2502 or SFH6345.

Q: What is the difference between HCPL-4562, HCPL-4562-000E, HCPL-4562-020E, and HCPL-4562-060E?

A: All variants share the same base product number HCPL-4562 and are functionally equivalent in 8-DIP package format. HCPL-4562-020E provides 5000Vrms isolation versus 3750Vrms for the others. Packaging differs: HCPL-4562 has unspecified packaging, while HCPL-4562-000E and HCPL-4562-060E are supplied in tubes.

Q: Is SFH6345 a direct substitute for HCPL2503?

A: SFH6345 meets all primary compatibility requirements: 8-DIP package, transistor output, DC input, 5300Vrms isolation (exceeds 2500Vrms requirement), 25V output voltage rating (exceeds 20V), 8mA output current, and -55°C ~ 100°C operating temperature range. The output type is listed as transistor rather than transistor with base; verify base connection availability in the specific application circuit.

Q: Why do some substitute parts have narrower operating temperature ranges?

A: HCPL-4562 series parts from Broadcom are specified for -40°C ~ 85°C operation. This is a design characteristic of these active products. Applications requiring -55°C ~ 100°C operation must select HCPL-2502 or SFH6345.

Q: What does RoHS compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. HCPL-2502 is RoHS non-compliant; all other substitutes are ROHS3 compliant. Design standards or customer requirements may mandate RoHS compliance.

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

A: All substitute parts use 8-DIP (0.300", 7.62mm) through-hole package. Packaging material differs: HCPL-2502, HCPL-4562-000E, HCPL-4562-020E, and HCPL-4562-060E are supplied in tubes. HCPL-4562 and SFH6345 packaging is specified differently but maintains the same 8-DIP footprint.

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