HCPL4502SD Optoisolator Equivalent & Substitute Parts

Part Overview

The HCPL4502SD is a 2500Vrms optoisolator transistor with base output manufactured by onsemi in 8-SMD gull wing packaging. This component provides galvanic isolation for single-channel DC input applications with transistor output and accessible base terminal. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Key Parameters

Parameter	Value
Isolation Voltage	2500Vrms
Number of Channels	1
Output Type	Transistor with Base
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 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
Package / Case	8-SMD, Gull Wing
Mounting Type	Surface Mount
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the HCPL4502SD is determined by the following critical parameters:

Isolation Voltage: Minimum 2500Vrms required; higher isolation ratings are acceptable
Output Type: Must be transistor with base output for circuit compatibility
Current Transfer Ratio: Range 19-50% @ 16mA maintains functional equivalence
Switching Speed: Turn on/off times within acceptable operational margins
Package Compatibility: 8-SMD gull wing form factor for PCB layout compatibility
Operating Temperature Range: Must support -55°C ~ 100°C minimum
Input Type: DC input required

Substitutes are grouped into three categories based on isolation voltage and output characteristics:

Category 1 - Enhanced Isolation (5000Vrms): HCPL4503SDM, HCPL-4562-520E Category 2 - Intermediate Isolation (3750Vrms): HCPL-4502-300E, HCPL-4502-320E, HCPL-4502-500E, HCPL-4504#300, HCPL-4562-300E, HCPL-4562-500E, HCPL-J454-400E, HCPL-J454-600E Category 3 - Functional Equivalents: Parts meeting isolation voltage, output type, and electrical parameter requirements

Parameter Comparison

Part Number	Manufacturer	Isolation Voltage	Output Type	CTR Min @ 16mA	CTR Max @ 16mA	Turn On / Turn Off (ns)	Vf (Typ)	If Max (mA)	Temp Range	Package	Status
HCPL4502SD	onsemi	2500Vrms	Transistor w/ Base	19%	50%	450 / 300	1.45V	25	-55 to 100°C	8-SMD GW	Obsolete
HCPL4503SDM	onsemi	5000Vrms	Transistor w/ Base	19%	50%	250 / 260	1.45V	25	-40 to 100°C	8-SMD GW	Active
HCPL-4502-300E	Broadcom Limited	3750Vrms	Transistor	19%	50%	200 / 600	1.5V	25	-55 to 100°C	8-SMD GW	Active
HCPL-4502-320E	Broadcom Limited	3750Vrms	Transistor	19%	50%	200 / 600	1.5V	25	-55 to 100°C	8-SMD GW	Active
HCPL-4502-500E	Broadcom Limited	3750Vrms	Transistor	19%	50%	200 / 600	1.5V	25	-55 to 100°C	8-SMD GW	Active
HCPL-4504#300	Broadcom Limited	3750Vrms	Transistor	25%	60%	200 / 300	1.5V	25	-55 to 100°C	8-SMD GW	Active
HCPL-4562-300E	Broadcom Limited	3750Vrms	Transistor w/ Base	—	—	—	1.3V	12	-40 to 85°C	8-SMD GW	Active
HCPL-4562-500E	Broadcom Limited	3750Vrms	Transistor w/ Base	—	—	—	1.3V	12	-40 to 85°C	8-SMD GW	Active
HCPL-4562-520E	Broadcom Limited	5000Vrms	Transistor w/ Base	—	—	—	1.3V	12	-40 to 85°C	8-SMD GW	Active
HCPL-J454-400E	Broadcom Limited	3750Vrms	Transistor	19%	60%	500 / 800	1.59V	25	-55 to 100°C	8-SMD GW	Active
HCPL-J454-600E	Broadcom Limited	3750Vrms	Transistor	19%	60%	500 / 800	1.59V	25	-55 to 100°C	8-SMD GW	Active

Engineering Selection Recommendations

Primary Substitute - HCPL4503SDM: Recommended for direct replacement where higher isolation voltage is acceptable. Maintains identical current transfer ratio range, transistor with base output configuration, and forward voltage characteristics. Active product status with unlimited moisture sensitivity level. Faster switching times (250ns/260ns) provide performance improvement. Operating temperature range -40°C to 100°C is compatible with most applications requiring -55°C minimum.

Secondary Substitutes - HCPL-4562 Series (300E, 500E, 520E): Suitable where base output is required and lower forward current (12mA max vs 25mA) is acceptable. HCPL-4562-520E provides 5000Vrms isolation matching HCPL4503SDM. All variants are ROHS3 compliant and active products. Operating temperature range limited to -40°C to 85°C; verify compatibility for applications requiring -55°C operation.

Alternative Substitutes - HCPL-4502 Series (300E, 320E, 500E): Broadcom Limited variants with 3750Vrms isolation. Maintain current transfer ratio and output voltage specifications. All support -55°C to 100°C operating range. Packaging variants (Tube, Tape & Reel) accommodate different procurement requirements. ROHS3 compliant.

Performance-Enhanced Substitutes - HCPL-4504#300, HCPL-J454 Series: Higher current transfer ratio (25-60% range) and improved switching characteristics. HCPL-4504#300 is RoHS non-compliant; verify regulatory requirements. HCPL-J454 variants (400E, 600E) are ROHS3 compliant with slower switching times (500ns/800ns).

Frequently Asked Questions (FAQ)

Q: Can HCPL4502SD be replaced with HCPL4503SDM in existing designs? A: Yes. HCPL4503SDM provides higher isolation voltage (5000Vrms vs 2500Vrms), identical current transfer ratio range, and transistor with base output. Verify operating temperature requirement; HCPL4503SDM minimum is -40°C versus -55°C for HCPL4502SD.

Q: What is the difference between HCPL-4502 and HCPL-4562 series substitutes? A: HCPL-4502 series lacks base output (transistor only), while HCPL-4562 series includes base output matching HCPL4502SD. HCPL-4562 series has lower maximum forward current (12mA vs 25mA) and narrower operating temperature range (-40°C to 85°C).

Q: Are all substitute parts RoHS compliant? A: Most substitutes are ROHS3 compliant. Exception: HCPL-4504#300 is RoHS non-compliant. Verify compliance requirements for your application before selection.

Q: Does packaging type affect electrical performance? A: No. Packaging variants (Tube, Tape & Reel, Cut Tape) are procurement and handling options only. Electrical specifications remain identical across packaging types for the same part number.

Q: Which substitute provides the fastest switching response? A: HCPL4503SDM offers the fastest switching times at 250ns turn-on and 260ns turn-off, compared to HCPL4502SD at 450ns/300ns.

Q: Can HCPL-4502-300E replace HCPL4502SD in applications requiring base output? A: No. HCPL-4502-300E is transistor output only without base terminal. Use HCPL-4562 series or HCPL4503SDM for base output requirement.

Q: What is the minimum isolation voltage acceptable for substitution? A: Minimum 2500Vrms to maintain electrical safety margin. All listed substitutes meet or exceed this requirement.

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