CDBC240SLR-HF Equivalent & Substitute Parts

Part Overview

The CDBC240SLR-HF is a Schottky rectifier diode manufactured by Comchip Technology, rated for 40 V DC reverse voltage and 2 A average rectified current in a DO-214AB (SMC) surface mount package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and procurement needs. Substitute parts must maintain compatibility with the original electrical specifications and mechanical form factor while offering active product status and improved availability.

Substiute Parts

CDBC240SLR-HF

Comchip TechnologyIn Stock: 1174CDBC240SLR-HF Datasheet

Current PartRFQ

B340-13-F

Diodes IncorporatedIn Stock: 51481B340-13-F Datasheet

MFR RecommendedRFQ

VSSC8L45-M3/9AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 16342VSSC8L45-M3/9AT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDBC240SLR-HF are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mandatory Compatibility Criteria:

• Technology: Schottky rectifier diode
• Voltage - DC Reverse (Vr) (Max): Equal to or greater than 40 V
• Current - Average Rectified (Io): Equal to or greater than 2 A
• Package / Case: DO-214AB (SMC) surface mount
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
• Mounting Type: Surface Mount

Acceptable Parameter Variations:

• Forward voltage (Vf) may vary within typical Schottky diode ranges
• Reverse leakage current may vary within acceptable limits for the voltage class
• Operating temperature range may differ provided it encompasses the application requirements
• Capacitance values may vary due to different semiconductor designs

Two substitute parts meet these criteria and are listed below.

Parameter Comparison

Engineering Selection Recommendations

B340-13-F (Diodes Incorporated):

The B340-13-F is an active product with identical voltage rating (40 V) and superior current rating (3 A versus 2 A). This part provides direct electrical compatibility with the CDBC240SLR-HF while offering higher current capacity for the same voltage class. The B340-13-F is ROHS3 compliant and maintains the same DO-214AB (SMC) package footprint. The operating temperature range (-55°C to 125°C) is narrower than the original part but covers standard industrial and commercial applications. This substitute is recommended for applications where the 2 A current requirement is firm and higher current capacity provides design margin.

VSSC8L45-M3/9AT (Vishay General Semiconductor - Diodes Division):

The VSSC8L45-M3/9AT is an active product from the TMBS® series with a higher voltage rating (45 V) and significantly higher current rating (4.9 A). This part exceeds the electrical requirements of the CDBC240SLR-HF in both voltage and current dimensions, providing substantial design margin. The VSSC8L45-M3/9AT is ROHS3 compliant and maintains the DO-214AB (SMC) package compatibility. The operating temperature range (-40°C to 150°C) matches the upper limit of the original part. This substitute is recommended for applications requiring enhanced performance headroom or where higher current capacity is anticipated in future design iterations.

Both substitute parts are available in high inventory quantities and carry active product status, ensuring long-term procurement viability.

Frequently Asked Questions (FAQ)

Q: Can the B340-13-F be used as a direct replacement for the CDBC240SLR-HF?

A: Yes. The B340-13-F meets all mandatory compatibility criteria: identical 40 V reverse voltage rating, equal or greater 3 A current rating (exceeds the 2 A requirement), identical DO-214AB (SMC) package, fast recovery speed specification, and surface mount mounting type. The part is electrically and mechanically compatible.

Q: What is the primary difference between the B340-13-F and VSSC8L45-M3/9AT substitutes?

A: The B340-13-F maintains the exact 40 V voltage rating of the original part with a 3 A current rating. The VSSC8L45-M3/9AT provides a higher 45 V voltage rating and 4.9 A current rating, offering greater design margin. Both are compatible; selection depends on whether exact voltage matching or enhanced performance headroom is prioritized.

Q: Are there package compatibility concerns when substituting these parts?

A: No. All three parts (CDBC240SLR-HF, B340-13-F, and VSSC8L45-M3/9AT) use the DO-214AB (SMC) surface mount package. PCB footprints and land patterns are identical, enabling direct substitution without layout modifications.

Q: Does the higher current rating of the VSSC8L45-M3/9AT affect circuit performance?

A: No. Higher current rating indicates the device can safely handle greater current without exceeding thermal or electrical limits. In circuits designed for 2 A operation, the VSSC8L45-M3/9AT operates within its safe operating area with additional margin. Forward voltage characteristics remain within acceptable Schottky diode ranges.

Q: What is the significance of the ROHS3 compliance status?

A: ROHS3 compliance indicates the substitute parts meet Restriction of Hazardous Substances Directive requirements, confirming absence of restricted materials (lead, cadmium, mercury, hexavalent chromium, PBBs, PBDEs). This is relevant for applications subject to environmental regulations or customer specifications requiring ROHS compliance.

Q: How do the operating temperature ranges compare?

A: The CDBC240SLR-HF operates from -50°C to 150°C. The B340-13-F operates from -55°C to 125°C (lower upper limit). The VSSC8L45-M3/9AT operates from -40°C to 150°C (higher lower limit but matches upper limit). For applications requiring the full -50°C to 150°C range, the VSSC8L45-M3/9AT is preferred.

Q: Is the higher reverse leakage current of the VSSC8L45-M3/9AT (1.85 mA @ 45 V versus 500 µA @ 40 V) a concern?

A: The reverse leakage current is specified at different voltage points (45 V versus 40 V). At the same 40 V operating point, the VSSC8L45-M3/9AT would exhibit lower leakage than specified. Reverse leakage increases with voltage; the higher specification reflects the higher voltage rating. For 40 V applications, this difference is not operationally significant.

Q: What inventory status should be considered for procurement?

A: The CDBC240SLR-HF is obsolete with 1,093 pieces in stock. The B340-13-F is active with 51,465 pieces in stock. The VSSC8L45-M3/9AT is active with 16,251 pieces in stock. Both substitutes offer substantially higher inventory availability, supporting long-term procurement reliability.