HCPL2503S Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL2503S is an optoisolator transistor with base output manufactured by onsemi, rated for 2500Vrms isolation voltage with 1 channel in 8-SMD surface mount packaging. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The HCPL2503S provides DC input with transistor output including base connection, suitable for high-voltage isolation applications requiring galvanic separation.

Key Parameters

Parameter	HCPL2503S
Manufacturer	onsemi
Product Status	Obsolete
Isolation Voltage	2500Vrms
Number of Channels	1
Output Type	Transistor with Base
Input Type	DC
Current Transfer Ratio (Min)	12% @ 16mA
Turn On / Turn Off Time	450ns / 300ns
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.45V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Surface Mount
Package / Case	8-SMD, Gull Wing
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the HCPL2503S is determined by the following critical parameters:

Isolation Voltage: Substitute parts must meet or exceed 2500Vrms isolation rating
Output Type: Transistor with base output configuration required for direct functional replacement
Package / Case: 8-SMD, Gull Wing form factor for PCB compatibility
Input Type: DC input requirement
Output Characteristics: Maximum output voltage 20V and output current 8mA per channel
Operating Temperature Range: Must support -55°C ~ 100°C or equivalent range
Mounting Type: Surface mount technology

The HCPL2503S obsolescence status necessitates substitution with active product alternatives. Substitute parts are grouped into two categories: direct replacements with transistor-with-base output (HCPL-2502 series, HCPL-4562 series) and functional alternatives with transistor-only output (HCPL-4504, HCPL-J454 series). All substitutes maintain 8-SMD packaging and support the required isolation voltage specifications.

Parameter Comparison

Parameter	HCPL2503S	HCPL-2502-300E	HCPL-2502-500E	HCPL-4504#300	HCPL-4562-300E	HCPL-4562-500E	HCPL-4562-520E	HCPL-J454-400E	HCPL-J454-600E
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
Isolation Voltage	2500Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	5000Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1	1	1	1	1	1
Output Type	Transistor with Base	Transistor with Base	Transistor with Base	Transistor	Transistor with Base	Transistor with Base	Transistor with Base	Transistor	Transistor
Input Type	DC	DC	DC	DC	DC	DC	DC	DC	DC
Current Transfer Ratio (Min)	12% @ 16mA	15% @ 16mA	15% @ 16mA	25% @ 16mA	—	—	—	19% @ 16mA	19% @ 16mA
Turn On / Turn Off Time	450ns / 300ns	200ns / 600ns	200ns / 600ns	200ns / 300ns	—	—	—	500ns / 800ns	500ns / 800ns
Voltage - Output (Max)	20V	20V	20V	20V	20V	20V	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.45V	1.5V	1.5V	1.5V	1.3V	1.3V	1.3V	1.59V	1.59V
Current - DC Forward (If) (Max)	25mA	25mA	25mA	25mA	12mA	12mA	12mA	25mA	25mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°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	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	8-SMD, Gull Wing
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Direct Replacement (Transistor with Base Output):

HCPL-2502-300E and HCPL-2502-500E are the primary direct replacements for the HCPL2503S. Both parts maintain transistor-with-base output configuration, support the required isolation voltage (3750Vrms exceeds the 2500Vrms requirement), and are available in active product status with ROHS3 compliance. The HCPL-2502 series offers improved current transfer ratio (15% minimum) and faster switching characteristics (200ns turn-on time). HCPL-2502-500E is available in higher inventory (4762 units) in Tape & Reel packaging, while HCPL-2502-300E is supplied in Tube packaging (629 units).

HCPL-4562-300E, HCPL-4562-500E, and HCPL-4562-520E provide alternative direct replacements with transistor-with-base output and higher isolation voltage ratings (3750Vrms to 5000Vrms). These parts operate within a narrower temperature range (-40°C ~ 85°C) compared to the HCPL2503S (-55°C ~ 100°C) and feature reduced forward current specification (12mA maximum). HCPL-4562-520E offers the highest isolation voltage at 5000Vrms. All HCPL-4562 variants are ROHS3 compliant and active products.

Functional Alternative (Transistor Output Without Base):

HCPL-4504#300 and HCPL-J454-400E/600E provide functional alternatives with transistor-only output (no base connection). These parts are suitable for applications where base control is not required. HCPL-4504#300 is RoHS non-compliant and should be selected only when legacy compliance requirements apply. HCPL-J454 series (400E and 600E variants) are ROHS3 compliant, active products with identical electrical characteristics and full temperature range support (-55°C ~ 100°C).

Compliance Considerations:

All recommended substitutes except HCPL-4504#300 are ROHS3 compliant. For new designs, HCPL-2502 or HCPL-J454 series are preferred. For applications requiring extended temperature operation below -40°C, HCPL-2502 or HCPL-J454 series maintain the full -55°C ~ 100°C range.

Frequently Asked Questions (FAQ)

Q: Can HCPL-2502-300E directly replace HCPL2503S without circuit modification?

A: Yes. HCPL-2502-300E maintains identical output type (transistor with base), package (8-SMD Gull Wing), and electrical interface. The higher isolation voltage (3750Vrms vs. 2500Vrms) provides additional safety margin. Pin-to-pin compatibility and functional behavior are preserved.

Q: What is the difference between HCPL-2502-300E and HCPL-2502-500E?

A: Both parts are electrically identical. The difference is packaging: HCPL-2502-300E is supplied in Tube packaging, while HCPL-2502-500E is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and inventory volume needs.

Q: Why do HCPL-4562 series parts have a narrower operating temperature range?

A: HCPL-4562 series is rated -40°C ~ 85°C, compared to HCPL2503S at -55°C ~ 100°C. For applications requiring full temperature range operation, select HCPL-2502 or HCPL-J454 series instead.

Q: Can HCPL-J454-400E be used instead of HCPL-2502-300E?

A: HCPL-J454-400E has transistor-only output (no base connection), while HCPL-2502-300E includes base output. If the circuit design requires base control, HCPL-J454 is not suitable. If base is not used in the circuit, HCPL-J454 is functionally compatible.

Q: What does "transistor with base" output mean?

A: Transistor with base output provides three connections: collector, emitter, and base. This allows external base current control for enhanced switching performance. Transistor-only output provides only collector and emitter connections.

Q: Are all substitute parts available in the same 8-SMD Gull Wing package?

A: Yes. All listed substitute parts use 8-SMD, Gull Wing surface mount packaging, ensuring PCB footprint compatibility with HCPL2503S designs.

Q: Which substitute offers the best current transfer ratio?

A: HCPL-4504#300 provides the highest current transfer ratio (25% minimum @ 16mA, up to 60% maximum). HCPL-2502 series offers 15% minimum, and HCPL-J454 series offers 19% minimum. Higher current transfer ratio improves switching efficiency.

Q: Is HCPL-4504#300 recommended for new designs?

A: HCPL-4504#300 is RoHS non-compliant. For new designs, select ROHS3-compliant alternatives: HCPL-2502, HCPL-4562, or HCPL-J454 series.

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