CDBC240LR-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBC240LR-HF is an active Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 2A average rectified current in a surface mount DO-214AB (SMC) package. This component is designed for fast recovery applications requiring switching speeds of 500ns or less at currents exceeding 200mA. The part is RoHS3 compliant with unlimited moisture sensitivity level (MSL 1) and is currently in active production with 1158 pieces available in new original stock.

Equivalent and substitute parts are identified when component availability is limited, supply chain disruptions occur, or design flexibility permits higher current ratings within the same voltage class and package footprint.

Substiute Parts

CDBC240LR-HF

Comchip TechnologyIn Stock: 1268CDBC240LR-HF Datasheet

Current PartRFQ

B340-13-F

Diodes IncorporatedIn Stock: 51481B340-13-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBC240LR-HF is permissible when the following conditions are met:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) Maximum: 40V (exact match required)
• Package / Case: DO-214AB or SMC (mechanical and thermal compatibility)
• Technology: Schottky (fast recovery characteristic)
• Mounting Type: Surface Mount (assembly compatibility)
• RoHS Status: ROHS3 Compliant (regulatory requirement)

Allowable Variation Parameters:

• Current - Average Rectified (Io): Equal to or greater than 2A (uprating permitted)
• Voltage - Forward (Vf) Maximum: Equal to or less than 450 mV @ rated current (lower forward drop acceptable)
• Operating Temperature - Junction: Range must encompass or exceed -50°C to +150°C
• Current - Reverse Leakage @ Vr: Equal to or less than 500 µA @ 40V (lower leakage acceptable)
• Capacitance @ Vr, F: No constraint specified for substitution

The B340-13-F from Diodes Incorporated qualifies as a manufacturer-recommended substitute based on these criteria.

Parameter Comparison

Engineering Selection Recommendations

Primary Part: CDBC240LR-HF

Select the CDBC240LR-HF when:

• Design specifications require the full operating temperature range of -50°C to +150°C
• Current demand is limited to 2A or below
• Comchip Technology supply chain is preferred or established
• Forward voltage drop at 2A (450 mV maximum) is a critical design parameter

Substitute Part: B340-13-F

Select the B340-13-F when:

• CDBC240LR-HF availability is constrained
• Circuit design permits operation within the -55°C to +125°C temperature range
• Higher current capacity (3A) provides design margin for future load increases
• Diodes Incorporated supply chain offers better availability or lead time
• Forward voltage drop at 3A (500 mV maximum) is acceptable within circuit tolerance
• Both parts are RoHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity rating

Thermal Consideration:

The B340-13-F operating temperature range (-55°C to +125°C) does not extend to the +150°C maximum junction temperature of the CDBC240LR-HF. Applications requiring sustained operation above +125°C must use the CDBC240LR-HF or verify that the B340-13-F thermal design margin is adequate for the specific application.

Frequently Asked Questions (FAQ)

Q1: Can the B340-13-F directly replace the CDBC240LR-HF in all applications?

A: The B340-13-F is mechanically and electrically compatible for applications operating within -55°C to +125°C junction temperature. Applications requiring operation above +125°C must retain the CDBC240LR-HF. Both parts share identical 40V reverse voltage rating, DO-214AB package, and fast recovery Schottky technology.

Q2: What is the significance of the 3A current rating on the B340-13-F versus the 2A rating on the CDBC240LR-HF?

A: The B340-13-F is rated for 3A average rectified current, which exceeds the 2A requirement of the CDBC240LR-HF. This uprating provides additional thermal and electrical margin. Circuits designed for 2A operation will function within the B340-13-F specifications without modification.

Q3: Does the higher forward voltage drop of the B340-13-F (500 mV @ 3A) affect circuit performance?

A: The forward voltage drop difference (500 mV @ 3A for B340-13-F versus 450 mV @ 2A for CDBC240LR-HF) must be evaluated in the specific circuit context. At the original 2A operating point, the B340-13-F forward drop will be lower than 500 mV. Circuit designers must verify that the power dissipation and voltage regulation remain within acceptable limits.

Q4: Are both parts suitable for high-frequency switching applications?

A: Both the CDBC240LR-HF and B340-13-F are specified for fast recovery Schottky operation with switching speeds of 500 nanoseconds or less at currents exceeding 200mA. Both parts are suitable for high-frequency rectification and switching applications within their respective current and temperature ratings.

Q5: What packaging differences exist between the CDBC240LR-HF and B340-13-F?

A: Both parts use the DO-214AB (SMC) surface mount package with identical mechanical footprint and thermal characteristics. The CDBC240LR-HF is supplied in Tape & Reel (TR) format, while the B340-13-F is available in Cut Tape (CT) and Digi-Reel® formats. PCB assembly compatibility is identical.

Q6: Are there any compliance or certification differences between these parts?

A: Both parts are RoHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity level. Both are classified under ECCN EAR99 and HTSUS 8541.10.0080. The B340-13-F includes REACH Unaffected status. No compliance barriers exist for substitution.

Q7: Which part should be selected for new design?

A: For new designs, either part is acceptable based on thermal requirements and supply chain considerations. The B340-13-F offers higher current capacity and broader availability (51,465 pieces in stock versus 1,158 for CDBC240LR-HF). The CDBC240LR-HF should be selected only if the extended temperature range to +150°C is a mandatory design requirement.