HCPL-273L-500E Equivalent & Substitute Parts

Part Overview

The HCPL-273L-500E is a 2-channel optoisolator with Darlington output manufactured by Broadcom Limited. This component provides 3750Vrms isolation voltage and is designed for applications requiring high-voltage signal isolation in surface mount configurations. The part is currently in active production status with 736 units in stock. Substitute parts are necessary when the primary part becomes unavailable, when alternative isolation voltage ratings are acceptable for the application, or when different current transfer ratio specifications better match system requirements.

Substiute Parts

HCPL-273L-500E

Broadcom LimitedIn Stock: 781HCPL-273L-500E Datasheet

Current PartRFQ

HCPL2730S

Fairchild SemiconductorIn Stock: 2300HCPL2730S Datasheet

MFR RecommendedRFQ

HCPL2730SD

onsemiIn Stock: 4478HCPL2730SD Datasheet

MFR RecommendedRFQ

HCPL2731S

onsemiIn Stock: 1131HCPL2731S Datasheet

MFR RecommendedRFQ

HCPL2731SD

onsemiIn Stock: 3156HCPL2731SD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the HCPL-273L-500E is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Number of Channels: 2 (all substitutes maintain this requirement)
• Output Type: Darlington (all substitutes use Darlington output)
• Mounting Type: Surface Mount (all substitutes are surface mount)
• Package / Case: 8-SMD, Gull Wing (all substitutes use this package)
• Input Type: DC (all substitutes accept DC input)
• Current - Output / Channel: 60mA (all substitutes support this current)
• Voltage - Forward (Vf): 1.3V to 1.5V range (acceptable across all substitutes)
• Current - DC Forward (If) (Max): 20mA (all substitutes support this specification)

Variable Parameters Affecting Substitution:

• Voltage - Isolation: 3750Vrms (main part) vs. 2500Vrms (substitute parts) — lower isolation voltage in substitutes requires application verification
• Current Transfer Ratio (Min): 300% to 500% range — higher ratios in some substitutes provide improved performance margin
• Voltage - Output (Max): 7V (main part) vs. 18V (HCPL2731 variants) — higher output voltage in some substitutes expands application flexibility
• Operating Temperature: 0°C ~ 70°C (main part) vs. -40°C ~ 85°C (substitute parts) — wider temperature range in substitutes
• Product Status: Active (main part) vs. Obsolete (substitute parts) — availability and long-term support considerations

The four substitute parts (HCPL2730S, HCPL2730SD, HCPL2731S, HCPL2731SD) are grouped into two functional categories: HCPL2730 variants with 300% minimum current transfer ratio and HCPL2731 variants with 500% minimum current transfer ratio.

Parameter Comparison

Engineering Selection Recommendations

HCPL2730S (Fairchild Semiconductor) This part maintains the 300% minimum current transfer ratio and 7V maximum output voltage of the HCPL-273L-500E while reducing isolation voltage to 2500Vrms. The part is in active production status with 2200 units in stock. HCPL2730S is suitable for applications where 2500Vrms isolation meets system requirements and where active product status is preferred for long-term availability. RoHS compliance status is not specified in available documentation.

HCPL2730SD (onsemi) This part is functionally equivalent to HCPL2730S with identical electrical specifications but is marked as obsolete. HCPL2730SD offers 4400 units in stock and carries ROHS3 compliance certification. Selection of this part should be limited to applications where existing inventory requirements justify use of an obsolete component, or where supply chain constraints necessitate alternative sourcing.

HCPL2731S (onsemi) This part increases the minimum current transfer ratio to 500% and maximum output voltage to 18V while maintaining 2500Vrms isolation. HCPL2731S is marked as obsolete with 1074 units available. The higher current transfer ratio provides improved performance margin for applications with marginal input signal levels. The 18V output voltage rating expands compatibility with higher-voltage load circuits.

HCPL2731SD (onsemi) This part is functionally equivalent to HCPL2731S with identical electrical specifications and carries ROHS3 compliance certification. HCPL2731SD is marked as obsolete but offers the highest inventory availability at 3100 units. This part combines the enhanced current transfer ratio and output voltage specifications of the HCPL2731 series with certified compliance status.

Primary Selection Criteria:

• For active product status with standard specifications: HCPL2730S
• For enhanced current transfer ratio and output voltage with compliance certification: HCPL2731SD
• For applications requiring 3750Vrms isolation: HCPL-273L-500E (no substitute available at equivalent isolation voltage)

Frequently Asked Questions (FAQ)

Q: Can HCPL2730 variants be used as direct replacements for HCPL-273L-500E? A: HCPL2730 variants are electrically compatible in applications where 2500Vrms isolation voltage is acceptable. The 1250Vrms reduction in isolation rating must be evaluated against system isolation requirements. All other electrical parameters, package configuration, and channel count are identical.

Q: What is the difference between HCPL2730 and HCPL2731 series? A: HCPL2731 variants provide 500% minimum current transfer ratio compared to 300% in HCPL2730 variants, and support 18V maximum output voltage compared to 7V. These enhancements allow HCPL2731 parts to drive higher-voltage loads and provide improved performance with weak input signals.

Q: Why are some substitute parts marked as obsolete? A: HCPL2730SD, HCPL2731S, and HCPL2731SD are marked as obsolete by their manufacturers. These parts remain available through current inventory but may not be produced in future manufacturing runs. Active product status is limited to HCPL-273L-500E and HCPL2730S.

Q: Are all substitute parts ROHS3 compliant? A: HCPL2730SD, HCPL2731S, and HCPL2731SD carry ROHS3 compliance certification. HCPL2730S compliance status is not specified in available documentation and should be confirmed with the supplier.

Q: What is the operating temperature range difference? A: HCPL-273L-500E operates from 0°C to 70°C. All substitute parts operate from -40°C to 85°C, providing extended temperature range capability suitable for industrial and automotive applications.

Q: Can packaging be mixed between HCPL-273L-500E and substitute parts? A: All parts use identical 8-SMD Gull Wing surface mount packaging. PCB footprints and reflow profiles are compatible across all listed parts.

Q: Which substitute part offers the best inventory availability? A: HCPL2730SD offers the highest inventory at 4400 units, followed by HCPL2731SD at 3100 units. HCPL2730S provides 2200 units with active product status.