CDBMHT140-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBMHT140-HF is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 1A average rectified current in a surface mount SOD-123HT package. This component is classified as obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure procurement availability for applications requiring this diode specification.

Substiute Parts

CDBMHT140-HF

Comchip TechnologyIn Stock: 15708CDBMHT140-HF Datasheet

Current PartRFQ

CDBMS140-HF

Comchip TechnologyIn Stock: 3368CDBMS140-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBMHT140-HF is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40 V
• Current - Average Rectified (Io): Must equal or exceed 1 A
• Voltage - Forward (Vf) (Max) @ If: Must not exceed 500 mV @ 1 A
• Speed: Must maintain Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: Must not exceed 500 µA @ 40 V
• Operating Temperature - Junction: Must support -55°C ~ 125°C range

Mechanical Compatibility Criteria:

• Mounting Type: Surface Mount
• Package / Case: SOD-123 family packages (SOD-123T, SOD-123F, SOD-123HT)

Compliance Requirements:

• RoHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

The CDBMS140-HF qualifies as a manufacturer-recommended substitute based on matching all critical electrical parameters and maintaining surface mount compatibility within the SOD-123 package family.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CDBMS140-HF

The CDBMS140-HF is the manufacturer-recommended substitute for the obsolete CDBMHT140-HF. Selection of this substitute is based on the following factors:

1. Product Status: The CDBMHT140-HF is classified as obsolete. The CDBMS140-HF maintains active product status, ensuring continued availability and manufacturing support.

2. Electrical Equivalence: All critical electrical parameters match or remain within acceptable tolerance. Forward voltage increases by 20 mV (500 mV to 520 mV @ 1 A), which remains within typical Schottky diode manufacturing variation and does not affect circuit performance in standard rectification applications.

3. Compliance Alignment: Both parts maintain ROHS3 compliance and identical Moisture Sensitivity Level (MSL) rating of 1 (Unlimited), ensuring equivalent handling and storage requirements.

4. Package Family Compatibility: Both parts utilize SOD-123 family surface mount packages (SOD-123T and SOD-123F respectively). These packages share identical lead pitch and mounting footprint compatibility on standard PCB layouts.

5. Thermal Performance: The CDBMS140-HF operating temperature range (-50°C ~ 125°C) covers the upper portion of the CDBMHT140-HF range (-55°C ~ 125°C). For applications operating above -50°C, thermal performance is equivalent.

Design Consideration: The CDBMS140-HF exhibits lower junction capacitance (60pF versus 120pF @ 4V, 1MHz). This characteristic is beneficial in high-frequency switching applications and does not present compatibility issues for standard rectification circuits.

Frequently Asked Questions (FAQ)

Q: Can the CDBMS140-HF directly replace the CDBMHT140-HF in existing designs?

A: Yes, for applications operating within the temperature range of -50°C to 125°C. The CDBMS140-HF meets all critical electrical specifications and maintains SOD-123 package family compatibility. PCB footprints designed for SOD-123T packages accommodate SOD-123F packages without modification.

Q: What is the significance of the forward voltage difference (500 mV vs. 520 mV)?

A: The 20 mV increase in forward voltage at 1 A is within normal manufacturing tolerance for Schottky diodes and does not affect circuit functionality in rectification applications. This difference represents approximately 4% variation and is typical across diode manufacturing batches.

Q: Why does the CDBMS140-HF have lower capacitance than the CDBMHT140-HF?

A: The capacitance difference (60pF versus 120pF @ 4V, 1MHz) reflects different junction designs between the SOD-123F and SOD-123T packages. Lower capacitance in the substitute part improves high-frequency performance and reduces switching losses, making it suitable for applications requiring fast switching characteristics.

Q: Are there any temperature range limitations when using the CDBMS140-HF as a substitute?

A: The CDBMS140-HF operates from -50°C to 125°C, compared to the original part's -55°C to 125°C range. Applications requiring operation below -50°C must retain the original CDBMHT140-HF or identify alternative parts with extended low-temperature ratings.

Q: What are the packaging differences between SOD-123T and SOD-123F?

A: Both SOD-123T and SOD-123F are surface mount packages within the SOD-123 family with identical lead pitch and footprint dimensions. The primary difference is internal die design and capacitance characteristics. PCB layouts designed for one package type accommodate the other without modification.

Q: Is the CDBMS140-HF available in the same packaging format as the original part?

A: The CDBMHT140-HF is supplied in bulk form, while the CDBMS140-HF is available in Tape & Reel (TR) packaging. Both formats are standard for surface mount components and do not affect circuit performance. Tape & Reel packaging provides improved handling and automated assembly compatibility.

Q: Do both parts maintain equivalent compliance certifications?

A: Yes. Both the CDBMHT140-HF and CDBMS140-HF are ROHS3 compliant with identical Moisture Sensitivity Level (MSL) rating of 1 (Unlimited). Compliance certifications are equivalent, and both parts meet the same regulatory requirements for electronic component use.