HCPL3700 Optoisolator Darlington Output Equivalent & Substitute Parts

Part Overview

The HCPL3700 is a 2500Vrms optoisolator with Darlington output in 8-DIP through-hole packaging manufactured by onsemi. This component is classified as obsolete, necessitating identification of active equivalent and substitute parts for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility across isolation voltage, output characteristics, channel configuration, and package specifications.

Substiute Parts

HCPL3700

onsemiIn Stock: 3360HCPL3700 Datasheet

Current PartRFQ

HCPL3700M

onsemiIn Stock: 143338HCPL3700M Datasheet

MFR RecommendedRFQ

HCPL-3700

Broadcom LimitedIn Stock: 2139HCPL-3700 Datasheet

SimilarRFQ

HCPL-3700-000E

Broadcom LimitedIn Stock: 1726HCPL-3700-000E Datasheet

SimilarRFQ

HCPL-3700-020E

Broadcom LimitedIn Stock: 6102HCPL-3700-020E Datasheet

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HCPL-3760

Broadcom LimitedIn Stock: 4215HCPL-3760 Datasheet

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HCPL-3760-000E

Broadcom LimitedIn Stock: 9562HCPL-3760-000E Datasheet

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HCPL-3760-060E

Broadcom LimitedIn Stock: 859HCPL-3760-060E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the HCPL3700 are grouped based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Single channel configuration (1 channel)
• Darlington output type
• 8-DIP through-hole package (0.300", 7.62mm)
• AC/DC input capability
• 20V maximum output voltage
• 30mA output current per channel
• Operating temperature range -40°C to 85°C

Isolation Voltage Consideration: Substitute parts with equal or higher isolation voltage ratings (2500Vrms or greater) are functionally compatible. Parts with lower isolation voltage ratings do not meet minimum substitution requirements.

Timing Characteristics: Turn-on/turn-off times and rise/fall times vary among substitutes but do not prevent functional substitution when other parameters align.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - MFR Recommended Substitute: HCPL3700M (onsemi) is the manufacturer-recommended substitute. This part maintains identical electrical and timing characteristics to the original HCPL3700 while offering active product status and higher isolation voltage (5000Vrms). ROHS3 compliance is maintained.

Alternative Substitutes - Broadcom Limited Parts: All Broadcom Limited optoisolators listed (HCPL-3700, HCPL-3700-000E, HCPL-3700-020E, HCPL-3760, HCPL-3760-000E, HCPL-3760-060E) meet core functional requirements with identical channel count, output type, voltage ratings, current capacity, and package specifications. All maintain active product status.

Compliance Considerations:

• HCPL3700M, HCPL-3700-000E, HCPL-3700-020E, HCPL-3760, HCPL-3760-000E, and HCPL-3760-060E are ROHS3 compliant.
• HCPL-3700 (Broadcom) is RoHS non-compliant and should be avoided in applications requiring RoHS compliance.

Timing Performance: Broadcom parts exhibit faster switching characteristics (4µs to 4.5µs turn-on time versus 6µs for onsemi parts). This represents an improvement in switching speed and does not create compatibility issues in standard applications.

Frequently Asked Questions (FAQ)

Q: Can HCPL3700M directly replace HCPL3700 in existing designs? A: Yes. HCPL3700M is the onsemi manufacturer-recommended substitute with identical pin configuration, package, and electrical characteristics. The higher isolation voltage (5000Vrms versus 2500Vrms) provides additional safety margin without affecting circuit operation.

Q: Are Broadcom optoisolators compatible with HCPL3700 designs? A: Yes. All listed Broadcom parts (HCPL-3700 series and HCPL-3760 series) maintain identical channel count, output type, voltage ratings, current capacity, and 8-DIP package specifications. Pin-for-pin compatibility is maintained across all substitutes.

Q: What is the difference between HCPL-3700 and HCPL-3760 variants? A: Both series provide 3750Vrms isolation voltage and identical output specifications. The HCPL-3760 series exhibits slightly faster switching times (4.5µs turn-on versus 4µs for HCPL-3700 series) and faster rise/fall times (14µs/0.4µs versus 20µs/0.3µs). Functional substitution is direct.

Q: Does the "-000E" or "-020E" suffix affect substitution compatibility? A: No. These suffixes denote packaging variants and internal configuration codes. All parts with the same base number (HCPL-3700 or HCPL-3760) are functionally equivalent for substitution purposes.

Q: Which substitute should be selected for RoHS-compliant applications? A: HCPL3700M (onsemi), HCPL-3700-000E, HCPL-3700-020E, HCPL-3760, HCPL-3760-000E, and HCPL-3760-060E are all ROHS3 compliant. Avoid HCPL-3700 (Broadcom) in RoHS-regulated applications.

Q: Are there inventory considerations for substitute selection? A: HCPL3700M offers the highest inventory availability (143,290 pcs). HCPL-3760-000E provides 9,500 pcs, and HCPL-3700-020E provides 6,000 pcs. Original HCPL3700 inventory is limited (3,300 pcs).

Q: Do timing differences between substitutes affect circuit performance? A: Broadcom parts exhibit faster switching characteristics than the original onsemi HCPL3700. In standard applications, faster switching represents an improvement. Applications with specific timing requirements should verify compatibility with datasheet specifications.