HCPL-2531#020 Equivalent & Substitute Parts

Part Overview

The HCPL-2531#020 is a 2-channel optoisolator with transistor output manufactured by Broadcom Limited, rated for 5000Vrms isolation voltage. This component is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The part operates across the industrial temperature range of -55°C to 100°C and is packaged in an 8-DIP through-hole configuration.

Key Parameters

Parameter	Value
Manufacturer Part Number	HCPL-2531#020
Manufacturer	Broadcom Limited
Category	Optoisolators
Number of Channels	2
Voltage - Isolation	5000Vrms
Current Transfer Ratio (Min)	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA
Turn On / Turn Off Time (Typ)	200ns, 600ns
Output Type	Transistor
Voltage - Output (Max)	20V
Current - Output / Channel	8mA
Voltage - Forward (Vf) (Typ)	1.5V
Current - DC Forward (If) (Max)	25mA
Operating Temperature	-55°C ~ 100°C
Mounting Type	Through Hole
Package / Case	8-DIP (0.300", 7.62mm)
RoHS Status	RoHS non-compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the HCPL-2531#020 is determined by the following critical parameters:

Direct Functional Equivalents (2-Channel Configuration):

HCPL-2531-020E: Identical electrical specifications with active product status and RoHS3 compliance

Parametric Equivalents (1-Channel Configuration):

HCPL-4502-020E, HCPL-4503#020, HCPL-4503-020E, EL4502, EL4502-V: These parts maintain the same isolation voltage (5000Vrms), current transfer ratio range (19%-50% @ 16mA), output voltage (20V max), output current (8mA), operating temperature range (-55°C ~ 100°C), and 8-DIP package. The primary difference is single-channel output versus dual-channel, requiring circuit design adaptation.

Substitution eligibility is based strictly on matching: isolation voltage, current transfer ratio specifications, output type (transistor), maximum output voltage, maximum output current per channel, operating temperature range, and physical package dimensions.

Parameter Comparison

Parameter	HCPL-2531#020	HCPL-2531-020E	HCPL-4502-020E	HCPL-4503#020	HCPL-4503-020E	EL4502	EL4502-V
Manufacturer	Broadcom	Broadcom	Broadcom	Broadcom	Broadcom	Everlight	Everlight
Number of Channels	2	2	1	1	1	1	1
Voltage - Isolation	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms	5000Vrms
Current Transfer Ratio (Min)	19% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA	19% @ 16mA
Current Transfer Ratio (Max)	50% @ 16mA	50% @ 16mA	50% @ 16mA	50% @ 16mA	50% @ 16mA	50% @ 16mA	50% @ 16mA
Turn On / Turn Off Time (Typ)	200ns, 600ns	200ns, 600ns	200ns, 600ns	200ns, 600ns	200ns, 600ns	350ns, 300ns	350ns, 300ns
Voltage - Output (Max)	20V	20V	20V	20V	20V	20V	20V
Current - Output / Channel	8mA	8mA	8mA	8mA	8mA	8mA	8mA
Voltage - Forward (Vf) (Typ)	1.5V	1.5V	1.5V	1.5V	1.5V	1.45V	1.45V
Current - DC Forward (If) (Max)	25mA	25mA	25mA	25mA	25mA	25mA	25mA
Operating Temperature	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C	-55°C ~ 100°C
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)
Product Status	Discontinued	Active	Active	Active	Active	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (2-Channel Requirement): HCPL-2531-020E is the primary selection. It maintains identical electrical and mechanical specifications while offering active product status and RoHS3 compliance, addressing regulatory requirements for new designs.

For Single-Channel Applications: HCPL-4503-020E (Broadcom) or EL4502 (Everlight) are suitable when circuit design permits single-channel operation. HCPL-4503-020E provides RoHS3 compliance and active status. EL4502 and EL4502-V offer higher inventory availability with RoHS3 compliance, though turn-on/turn-off timing differs (350ns/300ns versus 200ns/600ns).

For Legacy or Non-Compliant Applications: HCPL-4503#020 maintains the original RoHS non-compliant status if required for existing product lines, with active product status and equivalent electrical performance.

Compliance Considerations: All active substitute parts except HCPL-4503#020 meet RoHS3 compliance. Selection should align with end-product regulatory requirements and supply chain policies.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4502-020E or HCPL-4503-020E replace HCPL-2531#020 directly? A: These single-channel parts are parametrically equivalent in isolation voltage, current transfer ratio, output specifications, and package. Direct PCB substitution requires circuit modification to accommodate single-channel operation instead of dual-channel.

Q: What is the difference between Broadcom and Everlight optoisolators? A: Both manufacturers provide 5000Vrms isolation with matching current transfer ratios and output specifications. Everlight parts (EL4502, EL4502-V) have different turn-on/turn-off timing (350ns/300ns) compared to Broadcom (200ns/600ns). Selection depends on timing requirements and supply chain preferences.

Q: Is HCPL-2531-020E a true equivalent to HCPL-2531#020? A: Yes. HCPL-2531-020E is electrically and mechanically identical, with the primary differences being active product status and RoHS3 compliance. The packaging format changes from unspecified to Tube.

Q: Why do some parts show different forward voltage (Vf)? A: Everlight EL4502 and EL4502-V specify 1.45V typical forward voltage versus 1.5V for Broadcom parts. Both values fall within acceptable operating ranges for the input LED stage and do not affect substitution eligibility.

Q: Can I use a single-channel part in a dual-channel application? A: No. Applications requiring two independent isolated channels must use HCPL-2531-020E or equivalent dual-channel parts. Single-channel parts require circuit redesign.

Q: What does RoHS3 compliance mean for component selection? A: RoHS3 compliance indicates the part meets Restriction of Hazardous Substances regulations. For new designs or products sold in regulated markets, RoHS3-compliant parts (HCPL-2531-020E, HCPL-4502-020E, HCPL-4503-020E, EL4502, EL4502-V) are required.

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