HCPL2631 Equivalent & Substitute Parts

Part Overview

The HCPL2631 is a logic output optoisolator manufactured by onsemi, featuring 2.5kV isolation voltage, 2 channels, open collector output, and 10Mbps data rate in an 8-DIP package. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing system support and new design implementations. The HCPL2631 serves applications requiring galvanic isolation in digital signal transmission with moderate isolation voltage requirements and open collector output topology.

Substiute Parts

HCPL2631

onsemiIn Stock: 20447HCPL2631 Datasheet

Current PartRFQ

HCPL2631M

onsemiIn Stock: 12659HCPL2631M Datasheet

MFR RecommendedRFQ

HCPL-2631

Broadcom LimitedIn Stock: 25362HCPL-2631 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the HCPL2631 is determined by the following critical parameters:

• Number of Channels: Must be 2 channels
• Package Type: Must be 8-DIP (0.300", 7.62mm) for mechanical compatibility
• Output Configuration: Must be open collector topology
• Data Rate: Must support 10Mbps or higher
• Supply Voltage Range: Must operate within 4.5V ~ 5.5V
• Isolation Voltage: Minimum 2500Vrms (higher values provide enhanced isolation margin)
• Common Mode Transient Immunity: Minimum 5kV/µs

Two substitute parts meet these criteria: HCPL2631M (onsemi, active product) and HCPL-2631 (Broadcom Limited, active product). Both maintain identical channel count, package form factor, output type, and data rate specifications while offering enhanced or equivalent isolation performance.

Parameter Comparison

Engineering Selection Recommendations

HCPL2631M (onsemi) is the primary recommended substitute. This part is manufactured by the same supplier as the original HCPL2631, maintains active product status, and provides doubled isolation voltage (5000Vrms versus 2500Vrms), offering superior isolation margin. The HCPL2631M is ROHS3 compliant and extends the operating temperature range to -40°C ~ 110°C. The primary design consideration is reduced output current per channel (25 mA versus 50 mA), which must be evaluated against application load requirements.

HCPL-2631 (Broadcom Limited) is an alternative substitute with active product status. This part provides 3750Vrms isolation voltage and maintains the original 50 mA output current per channel. The Broadcom variant features enhanced common mode transient immunity (10kV/µs versus 5kV/µs) and Schottky clamped output topology. However, this part is RoHS non-compliant and exhibits slightly longer propagation delay (100ns versus 75ns). Selection of the Broadcom part is appropriate for applications where RoHS compliance is not required and higher CMTI performance is beneficial.

Frequently Asked Questions (FAQ)

Q: Can HCPL2631M be used as a direct replacement for HCPL2631?

A: HCPL2631M is mechanically and functionally compatible with HCPL2631 in the same 8-DIP package. Both parts feature 2 channels, open collector output, 10Mbps data rate, and identical supply voltage range. The primary difference is reduced output current per channel (25 mA versus 50 mA). Direct substitution is possible if application load current does not exceed 25 mA per channel.

Q: What is the difference between HCPL2631M and HCPL-2631?

A: Both are active substitutes for the obsolete HCPL2631. HCPL2631M (onsemi) provides higher isolation voltage (5000Vrms) and is ROHS3 compliant. HCPL-2631 (Broadcom) maintains the original 50 mA output current and features higher common mode transient immunity (10kV/µs). HCPL-2631 is RoHS non-compliant. Selection depends on isolation voltage requirements, output current needs, and regulatory compliance mandates.

Q: Are all three parts pin-compatible?

A: Yes. HCPL2631, HCPL2631M, and HCPL-2631 all use the 8-DIP (0.300", 7.62mm) package with identical pinout, enabling direct PCB substitution without layout modifications.

Q: What is the impact of reduced output current in HCPL2631M?

A: HCPL2631M provides 25 mA maximum output current per channel compared to 50 mA in the original HCPL2631. Applications requiring higher output current must either use HCPL-2631 (Broadcom) or implement external buffering circuitry with HCPL2631M.

Q: Does RoHS compliance status affect substitution decisions?

A: RoHS compliance is a regulatory requirement dependent on application and market jurisdiction. HCPL2631M is ROHS3 compliant, while HCPL-2631 is RoHS non-compliant. Applications subject to RoHS regulations must use HCPL2631M. Applications without RoHS requirements may use either substitute based on performance criteria.

Q: What is the significance of extended operating temperature range in HCPL2631M?

A: HCPL2631M operates from -40°C to 110°C, compared to -40°C to 85°C for both HCPL2631 and HCPL-2631. This extended range accommodates applications requiring higher temperature operation without thermal derating.