CFRM101-HF Equivalent & Substitute Parts

Part Overview

The CFRM101-HF is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 50 V DC reverse voltage and 1 A average rectified current in a Surface Mount Mini SMA/SOD-123 package. This component is classified as Obsolete, indicating discontinuation from active production. Identification of equivalent substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and system upgrades.

Substiute Parts

CFRM101-HF

Comchip TechnologyIn Stock: 781CFRM101-HF Datasheet

Current PartRFQ

CFRM104-HF

Comchip TechnologyIn Stock: 1797CFRM104-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CFRM101-HF is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

• Current - Average Rectified (Io): 1 A
• Voltage - Forward (Vf) (Max) @ If: 1.3 V @ 1 A
• Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
• Reverse Recovery Time (trr): 150 ns
• Package / Case: SOD-123T (Mini SMA/SOD-123)
• Mounting Type: Surface Mount
• Operating Temperature Range: -55°C to 150°C
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Allowable Variation Parameter:

• Voltage - DC Reverse (Vr) (Max): Substitute parts may exceed the original specification, provided all other parameters remain identical. Higher reverse voltage ratings maintain backward compatibility in applications where the original 50 V rating is sufficient.

The CFRM104-HF qualifies as a direct substitute because it maintains identical electrical performance characteristics (current, forward voltage, recovery time, capacitance, leakage current, and temperature range) while providing an elevated reverse voltage rating of 400 V. This higher voltage specification does not compromise functionality in circuits designed for 50 V operation.

Parameter Comparison

Engineering Selection Recommendations

CFRM104-HF as Primary Substitute:

The CFRM104-HF is the manufacturer-recommended substitute for the obsolete CFRM101-HF. Selection of this part is based on the following engineering criteria:

1. Product Status: The CFRM104-HF maintains Active product status, ensuring long-term availability and supply chain continuity. The CFRM101-HF is Obsolete and no longer manufactured.

2. Compliance and Certifications: The CFRM104-HF is RoHS3 Compliant and REACH Unaffected, meeting current regulatory requirements for electronic components in regulated markets. Moisture Sensitivity Level 1 (Unlimited) indicates no special handling requirements during storage or assembly.

3. Electrical Equivalence: All critical electrical parameters (current rating, forward voltage, recovery time, capacitance, and leakage current) are identical between the two parts. The elevated reverse voltage rating (400 V vs. 50 V) provides enhanced design margin without introducing incompatibility.

4. Package and Mounting Compatibility: Both parts use identical SOD-123T packaging and Surface Mount technology, enabling direct PCB layout substitution without redesign.

5. Inventory Availability: The CFRM104-HF is available in higher stock quantities (1740 Pcs) compared to the obsolete CFRM101-HF (761 Pcs), supporting production scalability.

Frequently Asked Questions (FAQ)

Q: Can the CFRM104-HF be used as a direct replacement for the CFRM101-HF without circuit modification?

A: Yes. The CFRM104-HF is electrically and mechanically equivalent to the CFRM101-HF across all critical parameters. The higher reverse voltage rating (400 V vs. 50 V) does not require circuit changes in applications designed for 50 V operation. Direct PCB substitution is possible without layout modifications.

Q: What is the significance of the higher reverse voltage rating on the CFRM104-HF?

A: The 400 V reverse voltage rating on the CFRM104-HF exceeds the original 50 V specification of the CFRM101-HF. This provides additional design margin and allows the part to function safely in circuits with higher transient voltage spikes or in applications where voltage headroom is beneficial. It does not degrade performance in lower-voltage applications.

Q: Are the forward voltage characteristics identical between these parts?

A: Yes. Both the CFRM101-HF and CFRM104-HF specify a maximum forward voltage of 1.3 V at 1 A. Forward voltage drop in rectification circuits will be equivalent, ensuring identical power dissipation and thermal behavior.

Q: Do the recovery time specifications match?

A: Yes. Both parts specify a reverse recovery time (trr) of 150 ns and are classified as Fast Recovery diodes (≤ 500ns, > 200mA). Switching performance in high-frequency applications is identical.

Q: Is the SOD-123T package identical on both parts?

A: Yes. Both the CFRM101-HF and CFRM104-HF use the SOD-123T package (Mini SMA/SOD-123). Footprint, lead spacing, and mounting requirements are identical, enabling direct PCB substitution.

Q: What is the Moisture Sensitivity Level (MSL) for these parts?

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity. Standard storage conditions and handling procedures are sufficient; no special dry-pack or baking procedures are required.

Q: Why is the CFRM104-HF recommended over the CFRM101-HF?

A: The CFRM104-HF is the manufacturer-recommended substitute because it is in Active production status, ensuring long-term availability. The CFRM101-HF is Obsolete and no longer manufactured. The CFRM104-HF also carries current regulatory certifications (RoHS3 Compliant, REACH Unaffected) and is available in higher stock quantities.

Q: Are there any temperature range differences between these parts?

A: No. Both parts specify an operating junction temperature range of -55°C to 150°C, ensuring equivalent thermal performance across all operating conditions.