HCPL-0721#560 Equivalent & Substitute Parts

Part Overview

The HCPL-0721#560 is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed digital isolation applications. This 3750Vrms isolation device features push-pull totem pole output topology with 25MBd data rate capability and 10kV/µs common mode transient immunity. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing system support and new designs.

Key Parameters

Parameter	Value
Voltage - Isolation	3750Vrms
Number of Channels	1
Input Type	Logic
Output Type	Push-Pull, Totem Pole
Data Rate	25MBd
Common Mode Transient Immunity (Min)	10kV/µs
Current - Output / Channel	10 mA
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-0721#560 is determined by the following critical parameters:

Isolation Voltage: 3750Vrms (all substitutes must match)
Output Configuration: Push-Pull, Totem Pole topology (all substitutes must match)
Package: 8-SOIC form factor (all substitutes must match)
Supply Voltage Range: 4.5V ~ 5.5V (all substitutes must match)
Output Current: 10 mA per channel (all substitutes must match)
Number of Channels: 1 channel (all substitutes must match)

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

Category A - Direct Rate Match (25MBd): HCPL-0721-560E, FOD0720, FOD0720R2, FOD0721, FOD0721R2

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

All listed substitutes maintain identical isolation voltage, output topology, package form factor, and supply voltage specifications. Category B substitutes operate at half the data rate but retain full electrical compatibility for lower-speed applications.

Parameter Comparison

Parameter	HCPL-0721#560	HCPL-0721-560E	FOD0710	FOD0710R2	FOD0720	FOD0720R2	FOD0721	FOD0721R2
Manufacturer	Broadcom Limited	Broadcom Limited	Fairchild Semiconductor	onsemi	Fairchild Semiconductor	Fairchild Semiconductor	onsemi	onsemi
Voltage - Isolation	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms	3750Vrms
Number of Channels	1	1	1	1	1	1	1	1
Input Type	Logic	Logic	Logic	Logic	Logic	Logic	Logic	Logic
Output Type	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole
Data Rate	25MBd	25MBd	12.5Mbps	12.5Mbps	25Mbps	25Mbps	25Mbps	25Mbps
Common Mode Transient Immunity (Min)	10kV/µs	10kV/µs	20kV/µs	20kV/µs	20kV/µs	20kV/µs	20kV/µs	20kV/µs
Current - Output / Channel	10 mA	10 mA	10 mA	10 mA	10 mA	10 mA	10 mA	10 mA
Propagation Delay tpLH / tpHL (Max)	40ns, 40ns	40ns, 40ns	40ns, 40ns	40ns, 40ns	40ns, 40ns	40ns, 40ns	40ns, 40ns	40ns, 40ns
Rise / Fall Time (Typ)	9ns, 8ns	9ns, 8ns	5ns, 4.5ns	5ns, 4.5ns	5ns, 4.5ns	5ns, 4.5ns	5ns, 4.5ns	5ns, 4.5ns
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C	-40°C ~ 100°C
Package / Case	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	Not specified	Not specified	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Active	Active	Active	Active	Active	Active

Engineering Selection Recommendations

Primary Recommendation: HCPL-0721-560E

The HCPL-0721-560E is the direct equivalent from Broadcom Limited, maintaining identical electrical specifications including 25MBd data rate and 10kV/µs CMTI. This part is currently active in production and ROHS3 compliant, providing the most direct replacement path. Packaging is available in Tape & Reel format.

Secondary Recommendations for 25Mbps Applications: FOD0720, FOD0720R2, FOD0721, FOD0721R2

These substitutes maintain full electrical compatibility with identical isolation voltage, output topology, package form factor, and 25Mbps data rate performance. All are currently active products with ROHS3 compliance. FOD0720R2 and FOD0721R2 are available in Tape & Reel packaging. These parts feature improved common mode transient immunity (20kV/µs versus 10kV/µs) and faster rise/fall times, providing enhanced performance margins.

Alternative for Reduced-Speed Applications: FOD0710, FOD0710R2

For applications where 12.5Mbps data rate is sufficient, FOD0710 and FOD0710R2 provide full electrical compatibility with identical isolation voltage, output topology, and package specifications. These parts are currently active and offer superior common mode transient immunity at 20kV/µs. FOD0710R2 is available in Tape & Reel format.

Compliance Consideration

The original HCPL-0721#560 is RoHS non-compliant. All recommended substitutes except FOD0710 and FOD0720 (status not specified) are ROHS3 compliant, supporting modern supply chain requirements.

Frequently Asked Questions (FAQ)

Q: Can FOD0710 or FOD0710R2 be used as direct replacements for the HCPL-0721#560?

A: Yes, electrically and mechanically. Both parts maintain identical isolation voltage (3750Vrms), output topology (push-pull totem pole), package form factor (8-SOIC), and supply voltage range (4.5V ~ 5.5V). The primary difference is reduced data rate (12.5Mbps versus 25MBd). Use these substitutes only if your application does not require the full 25MBd bandwidth.

Q: What is the difference between FOD0720 and FOD0720R2?

A: Both parts are electrically identical. The primary difference is packaging: FOD0720 is supplied in bulk format, while FOD0720R2 is supplied in Tape & Reel (TR) format. Select based on your procurement and assembly requirements.

Q: Are all substitute parts pin-compatible with the HCPL-0721#560?

A: Yes. All listed substitutes use the 8-SOIC package with identical pin assignments, enabling direct PCB replacement without layout modifications.

Q: Why do some substitutes show 20kV/µs CMTI instead of 10kV/µs?

A: The substitute parts (FOD series) feature enhanced common mode transient immunity specifications. This represents improved performance and does not affect compatibility. Applications designed for 10kV/µs CMTI will operate correctly with parts rated for 20kV/µs.

Q: Is the HCPL-0721-560E the recommended choice for new designs?

A: Yes. The HCPL-0721-560E is the direct Broadcom equivalent with identical specifications, active product status, and ROHS3 compliance. It is the preferred choice for design continuity and supply chain stability.

Q: Can I use FOD0721 or FOD0721R2 in place of HCPL-0721#560?

A: Yes. Both parts are electrically and mechanically compatible. FOD0721 is supplied in tube packaging, while FOD0721R2 is supplied in Tape & Reel format. Both are manufactured by onsemi and are ROHS3 compliant.

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