CDBB140LR-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBB140LR-HF is a surface mount Schottky diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 1A average rectified current in a DO-214AA (SMB) package. This component is classified as Active product status and is RoHS3 compliant. Equivalent and substitute parts are identified based on matching electrical specifications, package compatibility, and thermal operating ranges to ensure direct functional replacement in circuit applications.

Substiute Parts

CDBB140LR-HF

Comchip TechnologyIn Stock: 902CDBB140LR-HF Datasheet

Current PartRFQ

SK14B

Taiwan Semiconductor CorporationIn Stock: 12251SK14B Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CDBB140LR-HF is determined by the following critical parameters:

Electrical Specifications:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 40V
• Current - Average Rectified (Io): Must equal or exceed 1A
• Voltage - Forward (Vf) (Max) @ If: Must not exceed specified forward voltage at rated current
• Speed: Must maintain Fast Recovery characteristics ≤ 500ns for currents > 200mA
• Current - Reverse Leakage @ Vr: Must not exceed 500µA @ 40V

Package & Mechanical Compatibility:

• Package / Case: Must be DO-214AA (SMB) surface mount
• Mounting Type: Must be Surface Mount

Environmental & Compliance:

• Operating Temperature - Junction: Must support the required thermal range
• RoHS Status: Must be ROHS3 Compliant
• Moisture Sensitivity Level (MSL): Must be rated MSL 1 or equivalent

The SK14B from Taiwan Semiconductor Corporation meets all substitution criteria and is classified as a MFR Recommended substitute.

Parameter Comparison

Engineering Selection Recommendations

CDBB140LR-HF (Primary Component): The CDBB140LR-HF is the original specified component with Active product status. It is RoHS3 compliant and carries MSL 1 rating. This part is recommended for new designs and applications where the original manufacturer specification is required.

SK14B (Substitute Component): The SK14B is designated as a MFR Recommended substitute and meets all critical electrical and mechanical parameters. It is also RoHS3 compliant with MSL 1 rating. The SK14B is suitable for direct replacement in existing designs. The forward voltage specification of 500 mV @ 1A is 50 mV higher than the CDBB140LR-HF; however, this remains within acceptable operating margins for Schottky diode applications at this current rating. The operating temperature range of -55°C ~ 125°C is narrower than the CDBB140LR-HF (-50°C ~ 150°C); applications requiring operation above 125°C or below -55°C must use the original CDBB140LR-HF.

Both components are Active products with equivalent compliance certifications and packaging specifications.

Frequently Asked Questions (FAQ)

Q: Can SK14B be used as a direct replacement for CDBB140LR-HF?

A: Yes. The SK14B meets all critical electrical specifications (40V reverse voltage, 1A average rectified current, fast recovery speed) and is packaged identically in DO-214AA (SMB). Both components are RoHS3 compliant with MSL 1 rating. The SK14B is designated as a MFR Recommended substitute.

Q: What is the difference in forward voltage between these parts?

A: The CDBB140LR-HF specifies 450 mV maximum forward voltage @ 1A, while the SK14B specifies 500 mV maximum @ 1A. This 50 mV difference is within normal Schottky diode manufacturing tolerances and does not affect circuit compatibility in standard rectification applications.

Q: Are there temperature range limitations when using SK14B?

A: The SK14B operating temperature range is -55°C ~ 125°C, compared to the CDBB140LR-HF range of -50°C ~ 150°C. Applications requiring junction temperatures above 125°C must use the CDBB140LR-HF. For standard industrial and consumer applications operating within -55°C ~ 125°C, the SK14B is fully compatible.

Q: Do both parts have the same package and mounting compatibility?

A: Yes. Both CDBB140LR-HF and SK14B use the DO-214AA (SMB) surface mount package. They are mechanically and electrically interchangeable on PCB layouts designed for this package type.

Q: What is the reverse leakage current specification?

A: Both parts specify 500 µA maximum reverse leakage current @ 40V. This parameter is identical across both components.

Q: Are both parts RoHS compliant?

A: Yes. Both CDBB140LR-HF and SK14B are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating, meeting current environmental and reliability standards.