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HCPL-7721-320 Equivalent & Substitute Parts
Part Overview
The HCPL-7721-320 is a logic output optoisolator manufactured by Broadcom Limited, designed for high-speed digital isolation applications. It provides 5000Vrms isolation with push-pull totem pole output configuration, supporting data rates up to 25MBd and common mode transient immunity of 10kV/µs. The part is currently discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Broadcom Limited |
| Category | Optoisolators |
| Number of Channels | 1 |
| Voltage - Isolation | 5000Vrms |
| Common Mode Transient Immunity (Min) | 10kV/µs |
| Input Type | Logic |
| Output Type | Push-Pull, Totem Pole |
| Current - Output / Channel | 10 mA |
| Data Rate | 25MBd |
| Propagation Delay tpLH / tpHL (Max) | 40ns, 40ns |
| Rise / Fall Time (Typ) | 9ns, 8ns |
| Voltage - Supply | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package / Case | 8-SMD, Gull Wing |
| Mounting Type | Surface Mount |
Substitute Part Grouping Explanation
Substitution of the HCPL-7721-320 is determined by strict equivalence across the following critical parameters:
- Isolation voltage: 5000Vrms
- Common mode transient immunity: 10kV/µs minimum
- Output configuration: Push-pull, totem pole
- Data rate: 25MBd
- Output current per channel: 10 mA
- Propagation delay: 40ns maximum (both tpLH and tpHL)
- Package type: 8-SMD, Gull Wing
- Supply voltage range: 4.5V to 5.5V
- Operating temperature range: -40°C to 85°C
The HCPL-7721-320E meets all these parameters and is therefore a direct functional equivalent.
Parameter Comparison
| Parameter | HCPL-7721-320 | HCPL-7721-320E |
|---|---|---|
| Manufacturer | Broadcom Limited | Broadcom Limited |
| Number of Channels | 1 | 1 |
| Voltage - Isolation | 5000Vrms | 5000Vrms |
| Common Mode Transient Immunity (Min) | 10kV/µs | 10kV/µs |
| Input Type | Logic | Logic |
| Output Type | Push-Pull, Totem Pole | Push-Pull, Totem Pole |
| Current - Output / Channel | 10 mA | 10 mA |
| Data Rate | 25MBd | 25MBd |
| Propagation Delay tpLH / tpHL (Max) | 40ns, 40ns | 40ns, 40ns |
| Rise / Fall Time (Typ) | 9ns, 8ns | 9ns, 8ns |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 8-SMD, Gull Wing | 8-SMD, Gull Wing |
| Mounting Type | Surface Mount | Surface Mount |
| Product Status | Discontinued at DiGi Electronics | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
Engineering Selection Recommendations
The HCPL-7721-320E is the direct substitute for the HCPL-7721-320. Both parts share identical electrical and mechanical specifications across all critical parameters. The primary distinction is product status and compliance posture: the HCPL-7721-320 is discontinued, while the HCPL-7721-320E remains active in production. Additionally, the HCPL-7721-320E carries ROHS3 compliance, whereas the original part is RoHS non-compliant. For new designs and ongoing production requiring this optoisolator specification, the HCPL-7721-320E is the appropriate selection.
Frequently Asked Questions (FAQ)
Q: Can the HCPL-7721-320E be used as a direct replacement for the HCPL-7721-320?
A: Yes. The HCPL-7721-320E is electrically and mechanically identical to the HCPL-7721-320 across all specified parameters, including isolation voltage, CMTI, output configuration, data rate, propagation delay, and package type. Pin-for-pin compatibility is maintained.
Q: What is the difference between these two part numbers?
A: The HCPL-7721-320E differs in product status (active versus discontinued) and RoHS compliance (ROHS3 compliant versus non-compliant). The "E" suffix typically indicates a variant with updated compliance certifications. Electrical performance and package specifications are identical.
Q: Are there packaging differences between HCPL-7721-320 and HCPL-7721-320E?
A: Both parts use the same 8-SMD Gull Wing package. The HCPL-7721-320E is supplied in Tube packaging, while the original part number does not specify a packaging format in the provided data.
Q: What isolation voltage does this optoisolator provide?
A: Both the HCPL-7721-320 and HCPL-7721-320E provide 5000Vrms isolation, suitable for high-voltage isolation applications requiring galvanic separation.
Q: What is the maximum data rate supported?
A: The maximum data rate is 25MBd for both parts, with propagation delays of 40ns maximum for both rising and falling edges.
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