CDBB540-G Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBB540-G is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 5A average rectified current in a surface mount DO-214AA (SMB) package. This component is classified as "Not For New Designs," indicating it has reached end-of-life status. The CDBB540-HF serves as the direct active substitute, offering identical electrical and mechanical specifications while maintaining current production status and full component availability.

Substiute Parts

CDBB540-G

Comchip TechnologyIn Stock: 9234CDBB540-G Datasheet

Current PartRFQ

CDBB540-HF

Comchip TechnologyIn Stock: 990CDBB540-HF Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBB540-G is determined by strict equivalence across the following electrical and mechanical parameters:

Critical Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 5 A
• Voltage - Forward (Vf) (Max) @ If: 550 mV @ 5 A
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Current - Reverse Leakage @ Vr: 500 µA @ 40 V
• Capacitance @ Vr, F: 300 pF @ 4V, 1MHz
• Package / Case: DO-214AA (SMB)
• Operating Temperature - Junction: -50°C to 125°C
• Technology: Schottky

The CDBB540-HF meets all specified electrical and mechanical parameters identically to the CDBB540-G. Both components are manufactured by Comchip Technology and share the same base product number (CDBB540). The primary distinction is product status: CDBB540-G is designated "Not For New Designs," while CDBB540-HF maintains "Active" status with current manufacturing and inventory support.

Parameter Comparison

Engineering Selection Recommendations

For New Designs: Select CDBB540-HF. This component carries "Active" product status, ensuring continued manufacturing support, long-term availability, and compliance with current industry standards. ROHS3 compliance and REACH unaffected status confirm regulatory alignment for current applications.

For Legacy System Maintenance: CDBB540-G remains available with substantial inventory (9200 units). However, use of this component is restricted to repair and maintenance of existing systems only, as it is designated "Not For New Designs." Both components maintain identical electrical performance and package specifications, ensuring direct functional equivalence in legacy applications.

Compliance Considerations: Both CDBB540-G and CDBB540-HF are ROHS3 compliant and REACH unaffected. Moisture Sensitivity Level 1 (Unlimited) indicates no special moisture control requirements during storage or handling. Both components carry EAR99 export classification and HTSUS code 8541.10.0080.

Frequently Asked Questions (FAQ)

Q: Can CDBB540-HF directly replace CDBB540-G in existing circuit designs?

A: Yes. Both components are electrically and mechanically identical across all specified parameters: 40V reverse voltage rating, 5A average rectified current, 550mV forward voltage drop at 5A, fast recovery switching characteristics, and DO-214AA surface mount package. Direct substitution requires no circuit modifications.

Q: What is the difference between CDBB540-G and CDBB540-HF?

A: The components are electrically and mechanically identical. The primary difference is product lifecycle status: CDBB540-G is "Not For New Designs" (end-of-life), while CDBB540-HF is "Active" (current production). CDBB540-HF is recommended for all new circuit designs and long-term applications.

Q: Are there any package or pinout differences between these parts?

A: No. Both components use the DO-214AA (SMB) surface mount package with identical pinout and mechanical dimensions. PCB footprints and assembly processes are interchangeable.

Q: What are the key electrical parameters that define substitution eligibility?

A: Substitution is determined by matching: reverse voltage rating (40V), average rectified current (5A), forward voltage drop (550mV @ 5A), switching speed (fast recovery ≤500ns), reverse leakage current (500µA @ 40V), and junction capacitance (300pF @ 4V, 1MHz). All parameters must match exactly.

Q: Can CDBB540-G be used in new product designs?

A: No. CDBB540-G carries "Not For New Designs" status. Use CDBB540-HF for all new designs to ensure long-term supply chain stability and manufacturer support.

Q: Are both components RoHS and REACH compliant?

A: Yes. Both CDBB540-G and CDBB540-HF are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

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

A: Both components have MSL 1 (Unlimited), indicating no special moisture control or baking requirements during storage, handling, or assembly.