CPDF24V TVS Diode Equivalent & Substitute Parts

Part Overview

The CPDF24V is a 24V Zener transient voltage suppressor (TVS) diode manufactured by Comchip Technology, designed for general-purpose overvoltage protection applications. This bidirectional TVS diode features a 24V reverse standoff voltage with 47V maximum clamping voltage and 1A peak pulse current capability in a compact 1005/SOD-323F surface mount package. The component is ROHS3 compliant and carries unlimited moisture sensitivity rating (MSL 1), indicating robust reliability for industrial and commercial applications.

Substitute parts are necessary when the original CPDF24V becomes unavailable due to supply constraints, end-of-life status, or when alternative voltage ratings better match specific circuit protection requirements while maintaining functional compatibility.

Substiute Parts

CPDF24V

Comchip TechnologyIn Stock: 1101CPDF24V Datasheet

Current PartRFQ

SMF28CA-TP

Micro Commercial CoIn Stock: 12762SMF28CA-TP Datasheet

MFR RecommendedRFQ

SMF33CA-TP

Micro Commercial CoIn Stock: 3989SMF33CA-TP Datasheet

MFR RecommendedRFQ

SMF36CA-TP

Micro Commercial CoIn Stock: 6287SMF36CA-TP Datasheet

MFR RecommendedRFQ

SMF40CA-TP

Micro Commercial CoIn Stock: 30275SMF40CA-TP Datasheet

MFR RecommendedRFQ

SMF48CA-TP

Micro Commercial CoIn Stock: 12533SMF48CA-TP Datasheet

MFR RecommendedRFQ

SMF5.0CA-TP

Micro Commercial CoIn Stock: 10301SMF5.0CA-TP Datasheet

MFR RecommendedRFQ

SMF64CA-TP

Micro Commercial CoIn Stock: 12928SMF64CA-TP Datasheet

MFR RecommendedRFQ

SMF70CA-TP

Micro Commercial CoIn Stock: 32076SMF70CA-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CPDF24V is determined by the following critical parameters:

Primary Substitution Criteria:

• Bidirectional Zener TVS diode type with single channel configuration
• Voltage - Reverse Standoff rating between 24V and 28V (acceptable tolerance range for 24V protection circuits)
• Voltage - Clamping (Max) @ Ipp between 45V and 53V (maintains overvoltage suppression effectiveness)
• Current - Peak Pulse capability of 1A or greater (meets or exceeds original specification)
• Surface mount package configuration (SOD-123F or equivalent form factor)
• ROHS3 compliance and MSL 1 rating (environmental and reliability standards)
• Active product status (ongoing manufacturer support and availability)

Substitute Parts Identified:

• SMF28CA-TP (28V standoff, 45.4V clamp, 4.4A peak pulse)
• SMF33CA-TP (33V standoff, 53.3V clamp, 3.8A peak pulse)
• SMF36CA-TP (36V standoff, 58.1V clamp, 3.4A peak pulse)
• SMF40CA-TP (40V standoff, 64.5V clamp, 3.1A peak pulse)
• SMF48CA-TP (48V standoff, 77.4V clamp, 2.6A peak pulse)

Parts outside the acceptable voltage range (SMF5.0CA-TP, SMF64CA-TP, SMF70CA-TP) are not suitable substitutes for 24V protection circuits.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring equivalent environmental and reliability standards to the original CPDF24V. All substitute parts carry active product status with ongoing manufacturer support.

SMF28CA-TP provides the closest voltage alignment to the CPDF24V with 28V reverse standoff and 45.4V clamping voltage. This part offers superior peak pulse current capability (4.4A versus 1A) and increased power dissipation (200W versus 47W), making it suitable for applications requiring enhanced transient protection margin.

SMF33CA-TP, SMF36CA-TP, and SMF40CA-TP represent progressively higher voltage ratings suitable for circuits where the protected voltage bus exceeds 24V nominal. These parts maintain the same surface mount package family (SOD-123F) and offer increased current handling and power dissipation capabilities.

SMF48CA-TP addresses higher voltage protection requirements (48V standoff) while maintaining the same compliance certifications and reliability ratings as the original component.

Package form factor differences exist between the original 1005/SOD-323F and substitute SOD-123F packages. PCB layout modifications may be required to accommodate the different footprint geometry.

Frequently Asked Questions (FAQ)

Q: Can SMF28CA-TP directly replace CPDF24V without circuit modifications?

A: SMF28CA-TP is electrically compatible for 24V protection circuits. The 28V reverse standoff voltage provides adequate margin above the 24V nominal bus voltage. However, the SOD-123F package footprint differs from the original 1005/SOD-323F package, requiring PCB layout changes. Verify that the increased clamping voltage (45.4V versus 47V) and higher peak pulse current (4.4A versus 1A) are acceptable for your specific application.

Q: Which substitute part should I select for a 24V protection circuit?

A: SMF28CA-TP is the primary recommendation for direct voltage equivalence to the CPDF24V. The 28V reverse standoff voltage maintains appropriate protection margin for 24V nominal circuits. If your application requires higher voltage protection (above 28V nominal), select the substitute part matching your circuit voltage requirement: SMF33CA-TP for 33V circuits, SMF36CA-TP for 36V circuits, SMF40CA-TP for 40V circuits, or SMF48CA-TP for 48V circuits.

Q: Are all substitute parts available in the same packaging options as the original CPDF24V?

A: The CPDF24V is supplied in Tape & Reel (TR) packaging. SMF28CA-TP and SMF48CA-TP are available in Cut Tape (CT) & Digi-Reel® packaging. SMF33CA-TP, SMF36CA-TP, and SMF40CA-TP are available in Tape & Reel (TR) packaging. Verify packaging availability with your supplier to match your assembly requirements.

Q: What is the impact of the different package form factor (SOD-123F versus 1005/SOD-323F)?

A: The SOD-123F package used by all substitute parts differs in physical dimensions and footprint from the original 1005/SOD-323F package. PCB redesign is required to accommodate the new package geometry. Verify that the new footprint fits within your available board space and does not create signal integrity or thermal management issues.

Q: Do all substitute parts meet the same compliance standards as the CPDF24V?

A: Yes. All identified substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental and reliability certifications of the original CPDF24V. All parts maintain active product status with ongoing manufacturer support.

Q: Can I use SMF64CA-TP or SMF70CA-TP as substitutes for the CPDF24V?

A: No. SMF64CA-TP (64V standoff) and SMF70CA-TP (70V standoff) exceed the acceptable voltage range for 24V protection circuits. These parts are designed for significantly higher voltage applications and would not provide appropriate protection for 24V nominal circuits.