CDBM220-HF Equivalent & Substitute Parts

Part Overview

The CDBM220-HF is a Schottky diode manufactured by Comchip Technology, rated for 20 V DC reverse voltage and 2 A average rectified current in a Surface Mount Mini SMA/SOD-123 package. This component is classified as Obsolete, making identification of suitable substitute parts essential for ongoing design support and procurement continuity. The fast recovery characteristic (≤500ns, >200mA) and low forward voltage drop (500 mV @ 2 A) define its primary application domain in rectification and switching circuits requiring efficient power conversion.

Substiute Parts

CDBM220-HF

Comchip TechnologyIn Stock: 788CDBM220-HF Datasheet

Current PartRFQ

CDBM240-HF

Comchip TechnologyIn Stock: 10117CDBM240-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBM220-HF is determined by the following critical parameters:

Mandatory Compatibility Criteria:

• Technology: Schottky diode
• Package / Case: SOD-123T (Surface Mount Mini SMA/SOD-123)
• Current - Average Rectified (Io): 2 A minimum
• Voltage - Forward (Vf) (Max) @ If: 500 mV @ 2 A or lower
• Speed: Fast Recovery ≤500ns, >200mA (Io)
• Operating Temperature - Junction: -55°C to 125°C minimum range
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

Voltage Rating Consideration: The CDBM220-HF operates at 20 V DC reverse voltage. Substitute parts may have equal or higher voltage ratings, provided all other electrical and mechanical parameters remain within specification. A higher voltage rating does not disqualify a substitute; it represents a design margin increase.

The CDBM240-HF qualifies as a direct substitute because it maintains identical current, forward voltage, speed, temperature range, and package specifications while providing an elevated voltage rating of 40 V.

Parameter Comparison

Engineering Selection Recommendations

CDBM240-HF as Primary Substitute:

The CDBM240-HF is the qualified substitute for the obsolete CDBM220-HF. Selection is based on the following engineering factors:

1. Electrical Equivalence: All critical electrical parameters—current rating (2 A), forward voltage (500 mV @ 2 A), recovery speed (≤500ns, >200mA), and leakage current characteristics—are identical to the main part.

2. Voltage Rating Upgrade: The CDBM240-HF provides a 40 V reverse voltage rating compared to the CDBM220-HF's 20 V rating. This represents a design margin increase and does not introduce incompatibility in circuits designed for 20 V operation.

3. Package Compatibility: Both parts use the SOD-123T package, ensuring mechanical and thermal compatibility in existing PCB layouts without redesign.

4. Product Status: The CDBM240-HF holds Active product status with 10,100 pieces in stock, providing long-term availability and supply chain stability compared to the Obsolete CDBM220-HF.

5. Compliance and Certification: The CDBM240-HF is RoHS3 Compliant and REACH Unaffected, meeting current regulatory requirements. Both parts share identical MSL (1 - Unlimited) and ECCN/HTSUS classifications.

6. Temperature and Reliability: Operating temperature range (-55°C to 125°C) and moisture sensitivity specifications are identical, ensuring equivalent reliability performance.

Frequently Asked Questions (FAQ)

Q: Can the CDBM240-HF directly replace the CDBM220-HF without circuit modification?

A: Yes. The CDBM240-HF maintains identical current, forward voltage, speed, temperature range, and package specifications. The higher voltage rating (40 V vs. 20 V) provides additional design margin and does not require circuit changes for applications originally designed for 20 V operation.

Q: What is the significance of the voltage rating difference between these parts?

A: The CDBM220-HF is rated for 20 V DC reverse voltage, while the CDBM240-HF is rated for 40 V. In rectification and switching applications, a higher voltage rating indicates the diode can withstand greater reverse bias without breakdown. Substituting a 40 V part into a 20 V circuit increases the safety margin without affecting forward conduction characteristics.

Q: Are the package dimensions identical between CDBM220-HF and CDBM240-HF?

A: Yes. Both parts use the SOD-123T package (Mini SMA/SOD-123), ensuring identical footprint, lead spacing, and mounting compatibility on existing PCBs.

Q: Why is the CDBM220-HF classified as Obsolete?

A: Obsolete status indicates the manufacturer has discontinued production. The CDBM240-HF, with Active status and higher voltage rating, represents the current production equivalent and recommended replacement.

Q: What is the difference in reverse leakage current between the two parts?

A: The CDBM220-HF specifies 500 µA @ 20 V reverse leakage, while the CDBM240-HF specifies 500 µA @ 40 V. The leakage current is measured at the respective rated voltages. At equivalent operating conditions, leakage characteristics remain functionally similar.

Q: Are there any compliance or certification differences?

A: The CDBM240-HF includes RoHS3 Compliance and REACH Unaffected certifications, meeting current regulatory standards. Both parts share identical MSL (1 - Unlimited), ECCN (EAR99), and HTSUS (8541.10.0080) classifications.

Q: What packaging options are available for the CDBM240-HF?

A: The CDBM240-HF is supplied in Tape & Reel (TR) packaging, standard for high-volume surface mount assembly operations.