HCPL2730SD Equivalent & Substitute Parts

Part Overview

The HCPL2730SD is a 2-channel optoisolator with Darlington output manufactured by onsemi, rated for 2500Vrms isolation voltage. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The HCPL2730SD operates as a DC input optoisolator with dual Darlington outputs, suitable for applications requiring galvanic isolation in industrial and power management circuits.

Key Parameters

Parameter	HCPL2730SD
Manufacturer	onsemi
Number of Channels	2
Voltage - Isolation	2500Vrms
Current Transfer Ratio (Min)	300% @ 1.6mA
Output Type	Darlington
Voltage - Output (Max)	7V
Current - Output / Channel	60mA
Voltage - Forward (Vf) (Typ)	1.3V
Current - DC Forward (If) (Max)	20mA
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SMD, Gull Wing
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the HCPL2730SD is determined by the following critical parameters:

Primary Compatibility Criteria:

Number of Channels: 2 (all substitutes maintain this requirement)
Output Type: Darlington (all substitutes maintain this requirement)
Package / Case: 8-SMD, Gull Wing (all substitutes maintain this requirement)
Input Type: DC (all substitutes maintain this requirement)
Current - Output / Channel: 60mA (all substitutes maintain this requirement)

Secondary Compatibility Criteria:

Voltage - Isolation: Minimum 2500Vrms (substitutes may exceed this rating)
Current Transfer Ratio (Min): Minimum 300% @ 1.6mA (substitutes may exceed this rating)
Operating Temperature Range: Must encompass or exceed -40°C ~ 85°C
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment

The substitute parts are grouped into two categories based on isolation voltage rating and current transfer ratio performance:

Group 1 (HCPL-2730 Series): HCPL-2730-320E and HCPL-273L-500E maintain the HCPL-2730 base product number with enhanced isolation voltage ratings (5000Vrms and 3750Vrms respectively).

Group 2 (HCPL-4731 Series): HCPL-4731#300, HCPL-4731-300E, HCPL-4731-320E, HCPL-4731-500E, and HCPL-4731-520E offer higher current transfer ratios (600% minimum @ 500µA) and increased maximum output voltage (18V), providing enhanced performance margins.

Parameter Comparison

Parameter	HCPL2730SD	HCPL-2730-320E	HCPL-273L-500E	HCPL-4731#300	HCPL-4731-300E	HCPL-4731-320E	HCPL-4731-500E	HCPL-4731-520E
Manufacturer	onsemi	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited	Broadcom Limited
Number of Channels	2	2	2	2	2	2	2	2
Voltage - Isolation	2500Vrms	5000Vrms	3750Vrms	3750Vrms	3750Vrms	5000Vrms	3750Vrms	5000Vrms
Current Transfer Ratio (Min)	300% @ 1.6mA	300% @ 1.6mA	300% @ 1.6mA	600% @ 500µA	600% @ 500µA	600% @ 500µA	600% @ 500µA	600% @ 500µA
Output Type	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington	Darlington
Voltage - Output (Max)	7V	7V	7V	18V	18V	18V	18V	18V
Current - Output / Channel	60mA	60mA	60mA	60mA	60mA	60mA	60mA	60mA
Voltage - Forward (Vf) (Typ)	1.3V	1.4V	1.5V	1.25V	1.25V	1.25V	1.25V	1.25V
Current - DC Forward (If) (Max)	20mA	12mA	20mA	10mA	10mA	10mA	10mA	10mA
Operating Temperature	-40°C ~ 85°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C	0°C ~ 70°C
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
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Minimum Specification Match): HCPL-2730-320E and HCPL-273L-500E are direct functional replacements. Both maintain the HCPL-2730 base product lineage, preserve the 7V maximum output voltage, and are ROHS3 compliant. HCPL-2730-320E provides 5000Vrms isolation (double the original rating), while HCPL-273L-500E offers 3750Vrms isolation. Both are active products with established supply chains.

For Enhanced Performance Applications: The HCPL-4731 series (HCPL-4731-300E, HCPL-4731-320E, HCPL-4731-500E, HCPL-4731-520E) delivers superior current transfer ratios (600% minimum @ 500µA versus 300% @ 1.6mA) and higher maximum output voltage (18V). These parts are suitable when circuit designs require improved noise margins or higher output voltage swing. All HCPL-4731 variants except HCPL-4731#300 are ROHS3 compliant.

Temperature Range Consideration: The HCPL2730SD operates across -40°C to 85°C. All substitute parts operate within 0°C to 70°C. Applications requiring the extended low-temperature performance of the original part cannot use these substitutes without design modification or thermal management review.

Compliance and Supply Status: All recommended substitutes are active products with current manufacturing status. ROHS3 compliance is maintained across the HCPL-2730 series and most HCPL-4731 variants, ensuring regulatory alignment for new designs.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4731 series parts directly replace HCPL2730SD in existing designs? A: Electrical substitution is possible due to matching channel count, output type, package, and current ratings. However, the HCPL-4731 series exhibits higher current transfer ratios and maximum output voltage (18V versus 7V). Circuit designs relying on the 7V output limit must be reviewed. The reduced maximum forward current (10mA versus 20mA) may affect input drive requirements.

Q: What is the impact of the operating temperature range difference? A: The HCPL2730SD operates from -40°C to 85°C, while all substitutes operate from 0°C to 70°C. Applications requiring operation below 0°C or above 70°C cannot use these substitutes without additional thermal management or design modification.

Q: Are all substitute parts ROHS3 compliant? A: HCPL-2730-320E, HCPL-273L-500E, HCPL-4731-300E, HCPL-4731-320E, HCPL-4731-500E, and HCPL-4731-520E are ROHS3 compliant. HCPL-4731#300 is RoHS non-compliant and should not be used in applications requiring regulatory compliance.

Q: What is the difference between HCPL-2730 and HCPL-4731 series substitutes? A: The HCPL-2730 series maintains the original part's electrical characteristics with enhanced isolation voltage. The HCPL-4731 series provides higher current transfer ratios (600% minimum @ 500µA) and increased maximum output voltage (18V), offering improved performance margins but requiring circuit validation for compatibility.

Q: How do isolation voltage ratings affect substitution? A: All substitutes meet or exceed the 2500Vrms isolation requirement. HCPL-2730-320E and HCPL-4731-320E/520E provide 5000Vrms isolation. HCPL-273L-500E, HCPL-4731#300, HCPL-4731-300E, and HCPL-4731-500E provide 3750Vrms isolation. Higher isolation ratings provide additional safety margin but do not affect functional compatibility in applications designed for 2500Vrms.

Q: What packaging options are available? A: All substitute parts maintain the 8-SMD, Gull Wing package format. Packaging variants (Tube, Tape & Reel) differ by supplier but do not affect electrical performance or PCB compatibility.

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