HCPL-0720#500 Equivalent & Substitute Parts

Part Overview

The HCPL-0720#500 is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed digital isolation applications. This 3750Vrms isolation device operates at 25MBd with push-pull totem pole output configuration, housed in an 8-SO Tall package. The part is currently active in production with 1869 units in stock.

Substitute parts are necessary when the HCPL-0720#500 becomes unavailable, when alternative packaging formats are required, or when design requirements permit operation with modified electrical characteristics within the same functional class.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Input Type	Logic
Output Type	Push-Pull, Totem Pole
Current - Output / Channel	10 mA
Data Rate	25MBd
Common Mode Transient Immunity (Min)	10kV/µs
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the HCPL-0720#500 is determined by the following critical parameters:

Isolation Voltage: 3750Vrms (all substitutes maintain this specification)
Number of Channels: 1 channel (single-channel configuration required)
Output Configuration: Push-Pull, Totem Pole (output stage topology must match)
Package / Case: 8-SOIC (0.154", 3.90mm Width) (physical footprint compatibility)
Voltage - Supply: 4.5V ~ 5.5V (power supply range)
Mounting Type: Surface Mount (PCB assembly compatibility)

Substitutes are grouped into two categories based on data rate capability:

Category A - Direct Rate Match (25MBd/25Mbps): HCPL-0720-500E, FOD0720, FOD0720R2, FOD0721, FOD0721R2

Category B - Reduced Rate (12.5Mbps): FOD0710, FOD0710R2

Parameter Comparison

Part Number	Manufacturer	Data Rate	CMTI (Min)	Temp Range	Packaging	RoHS Status	Inventory
HCPL-0720#500	Broadcom Limited	25MBd	10kV/µs	-40°C ~ 85°C	8-SO Tall	RoHS non-compliant	1869 Pcs
HCPL-0720-500E	Broadcom Limited	25MBd	10kV/µs	-40°C ~ 85°C	Cut Tape (CT) & Digi-Reel®	ROHS3 Compliant	6603 Pcs
FOD0710	Fairchild Semiconductor	12.5Mbps	20kV/µs	-40°C ~ 100°C	8-SOIC	Not specified	19100 Pcs
FOD0710R2	onsemi	12.5Mbps	20kV/µs	-40°C ~ 100°C	8-SOIC	ROHS3 Compliant	3620 Pcs
FOD0720	Fairchild Semiconductor	25Mbps	20kV/µs	-40°C ~ 100°C	8-SOIC	Not specified	5394 Pcs
FOD0720R2	Fairchild Semiconductor	25Mbps	20kV/µs	-40°C ~ 100°C	8-SOIC	Not specified	3720 Pcs
FOD0721	onsemi	25Mbps	20kV/µs	-40°C ~ 100°C	8-SOIC	ROHS3 Compliant	1923 Pcs
FOD0721R2	onsemi	25Mbps	20kV/µs	-40°C ~ 100°C	8-SOIC	ROHS3 Compliant	3820 Pcs

Engineering Selection Recommendations

HCPL-0720-500E is the primary direct substitute, offering identical electrical specifications with improved RoHS3 compliance and higher inventory availability (6603 units). This part maintains the same data rate, isolation voltage, and operating temperature range as the original HCPL-0720#500.

FOD0720, FOD0720R2, FOD0721, and FOD0721R2 are functionally equivalent at the 25Mbps data rate with enhanced common mode transient immunity (20kV/µs versus 10kV/µs) and extended operating temperature range (-40°C to 100°C). FOD0721 and FOD0721R2 carry ROHS3 compliance certification. These parts are suitable for applications where the improved CMTI and temperature range provide design margin.

FOD0710 and FOD0710R2 operate at 12.5Mbps, half the data rate of the original part. These substitutes are applicable only in applications where the reduced bandwidth requirement is acceptable. FOD0710R2 provides ROHS3 compliance with tape and reel packaging.

Selection should prioritize parts with active product status and compliance certifications matching system requirements.

Frequently Asked Questions (FAQ)

Q: Can FOD0710 or FOD0710R2 replace HCPL-0720#500 in all applications?

A: No. FOD0710 and FOD0710R2 operate at 12.5Mbps, which is half the data rate of HCPL-0720#500 (25MBd). These parts are substitutes only for applications where the reduced bandwidth is acceptable.

Q: What is the difference between HCPL-0720#500 and HCPL-0720-500E?

A: Both parts are manufactured by Broadcom Limited with identical electrical specifications. The primary differences are packaging format (8-SO Tall versus Cut Tape & Digi-Reel®) and RoHS compliance status (non-compliant versus ROHS3 compliant). HCPL-0720-500E has higher inventory availability.

Q: Do FOD0720 and FOD0721 parts fit the same PCB footprint?

A: Yes. All substitute parts use the 8-SOIC (0.154", 3.90mm Width) package, which is mechanically compatible with the original HCPL-0720#500 8-SO Tall package for surface mount assembly.

Q: What is the significance of the higher CMTI rating (20kV/µs) in FOD parts?

A: The FOD series parts (FOD0710, FOD0720, FOD0721) specify 20kV/µs common mode transient immunity compared to 10kV/µs for HCPL-0720#500. This indicates improved performance in high-speed switching environments with steep voltage transitions.

Q: Are all substitute parts RoHS compliant?

A: No. HCPL-0720-500E, FOD0710R2, FOD0721, and FOD0721R2 are ROHS3 compliant. FOD0710, FOD0720, and FOD0720R2 do not specify RoHS compliance status. Verify compliance requirements for your application before selection.

Q: What is the operating temperature difference between HCPL-0720#500 and substitute parts?

A: HCPL-0720#500 operates from -40°C to 85°C. FOD0710, FOD0710R2, FOD0720, FOD0720R2, FOD0721, and FOD0721R2 extend the upper limit to 100°C, providing 15°C additional thermal margin.

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