HCPL2730 Equivalent & Substitute Parts

Part Overview

The HCPL2730 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 requirements. The HCPL2730 operates as a DC input optoisolator with Darlington output configuration, suitable for applications requiring galvanic isolation in industrial and power management circuits.

Substiute Parts

HCPL2730

onsemiIn Stock: 5575HCPL2730 Datasheet

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HCPL-2730

Broadcom LimitedIn Stock: 1381HCPL-2730 Datasheet

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HCPL-2730-000E

Broadcom LimitedIn Stock: 1423HCPL-2730-000E Datasheet

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HCPL-4731

Broadcom LimitedIn Stock: 2354HCPL-4731 Datasheet

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HCPL-4731-000E

Broadcom LimitedIn Stock: 2316HCPL-4731-000E Datasheet

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HCPL-4731-020E

Broadcom LimitedIn Stock: 803HCPL-4731-020E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the HCPL2730 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use the 8-DIP (0.300", 7.62mm) through-hole package to ensure mechanical and electrical compatibility with existing PCB layouts.

Channel Configuration: The 2-channel Darlington output configuration is maintained across all substitutes, preserving functional equivalence.

Isolation Voltage: Substitute parts must meet or exceed the 2500Vrms isolation requirement. Parts with higher isolation ratings (3750Vrms, 5000Vrms) are acceptable as they provide enhanced isolation margin.

Output Characteristics: Maximum output voltage and current per channel (7V, 60mA) establish the baseline performance envelope. Substitutes with equal or superior ratings maintain compatibility.

Input Type and Output Type: DC input with Darlington output configuration is consistent across all substitutes.

Operating Temperature Range: The HCPL2730 operates from -40°C to 85°C. Substitutes with narrower ranges (0°C to 70°C) are acceptable for applications within that overlap window.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (HCPL-2730 and HCPL-2730-000E): These Broadcom parts maintain the same isolation voltage class (3750Vrms), channel count, and output voltage rating as the onsemi HCPL2730. Both are active products with full availability. HCPL-2730-000E is preferred for new designs due to ROHS3 compliance. The narrower operating temperature range (0°C to 70°C) applies only to applications within this window.

Enhanced Performance Substitutes (HCPL-4731, HCPL-4731-000E, HCPL-4731-020E): These parts offer higher isolation voltage ratings (3750Vrms or 5000Vrms) and increased maximum output voltage (18V). The HCPL-4731 series features higher current transfer ratios (600% minimum at 500µA) compared to the HCPL2730 (300% at 1.6mA). HCPL-4731-000E and HCPL-4731-020E are ROHS3 compliant and suitable for regulatory-sensitive applications. HCPL-4731-020E provides the highest isolation rating at 5000Vrms for maximum isolation margin.

Compliance Considerations: For applications requiring RoHS3 compliance, select HCPL-2730-000E, HCPL-4731-000E, or HCPL-4731-020E. All substitute parts maintain EAR99 export classification and REACH unaffected status consistent with the original HCPL2730.

Frequently Asked Questions (FAQ)

Q: Can HCPL-4731 series parts replace HCPL2730 in existing designs?

A: Yes. The HCPL-4731 series maintains the same 8-DIP package, 2-channel configuration, and 60mA output current per channel. The higher isolation voltage (3750Vrms or 5000Vrms) and increased output voltage rating (18V) provide enhanced performance margins. Applications limited to 7V output must account for the higher rating, which does not create incompatibility.

Q: What is the impact of the narrower operating temperature range in Broadcom substitutes?

A: Broadcom HCPL-2730 and HCPL-4731 series parts operate from 0°C to 70°C, compared to the onsemi HCPL2730 range of -40°C to 85°C. For applications operating within 0°C to 70°C, there is no functional impact. Applications requiring operation below 0°C or above 70°C must remain with the original onsemi part or identify alternative solutions.

Q: Are there differences in current transfer ratio between HCPL2730 and its substitutes?

A: Yes. The onsemi HCPL2730 specifies 300% minimum CTR at 1.6mA input current. Broadcom HCPL-2730 variants maintain this specification. HCPL-4731 series parts specify 600% minimum CTR at 500µA input current, indicating higher gain at lower input drive levels. This difference does not prevent substitution but may affect circuit design parameters.

Q: Which substitute is recommended for new production designs?

A: HCPL-2730-000E or HCPL-4731-000E are recommended for new designs. Both are active products with ROHS3 compliance and full availability. Selection between them depends on whether the enhanced isolation voltage and output voltage of HCPL-4731-000E are required for the application.

Q: Is the 8-DIP package consistent across all parts?

A: Yes. All substitute parts use the 8-DIP (0.300", 7.62mm) through-hole package, ensuring direct PCB compatibility without layout modifications.