CDBB240LR-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBB240LR-HF is a surface mount Schottky rectifier diode manufactured by Comchip Technology, rated for 40V DC reverse voltage and 2A average rectified current in a DO-214AA (SMB) package. This component is classified as Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Equivalent and substitute parts are identified when design requirements permit higher current ratings, alternative packaging formats, or when primary part availability is constrained. The CDBB240LR-HF maintains fast recovery characteristics (≤500ns at >200mA) suitable for switching power supply and rectification applications requiring low forward voltage drop and minimal reverse leakage.

Substiute Parts

CDBB240LR-HF

Comchip TechnologyIn Stock: 1188CDBB240LR-HF Datasheet

Current PartRFQ

SSB44HR5G

Taiwan Semiconductor CorporationIn Stock: 1813SSB44HR5G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBB240LR-HF is determined by the following critical parameters:

Mandatory Matching Parameters:

• Voltage - DC Reverse (Vr) Maximum: 40V (exact match required)
• Package / Case: DO-214AA (SMB) (exact match required for PCB compatibility)
• Technology: Schottky (rectifier type)
• Mounting Type: Surface Mount

Allowable Variation Parameters:

• Current - Average Rectified (Io): Substitute parts may have equal or higher current rating (≥2A)
• Voltage - Forward (Vf): Substitute parts may have equal or lower forward voltage drop
• Current - Reverse Leakage: Substitute parts may have equal or lower reverse leakage
• Capacitance: Substitute parts may have equal or lower capacitance values
• Operating Temperature Range: Substitute parts must maintain minimum -50°C to 150°C or wider range
• Product Status: Active or Discontinued parts are acceptable; availability and compliance status must be verified

The SSB44HR5G qualifies as a substitute because it maintains the 40V reverse voltage rating and DO-214AA package while offering higher current capacity (4A vs. 2A), lower reverse leakage (200µA vs. 500µA), and automotive-grade qualification (AEC-Q101).

Parameter Comparison

Engineering Selection Recommendations

CDBB240LR-HF Selection Criteria:

• Primary choice for applications requiring 2A rectified current at 40V
• Active product status ensures ongoing availability and supply chain stability
• Standard industrial-grade qualification suitable for consumer and general industrial applications
• Lower capacitance (30pF) preferred in high-frequency switching applications where junction capacitance affects performance

SSB44HR5G Selection Criteria:

• Substitute when higher current capacity (4A) is required within the same 40V voltage class
• Automotive-grade qualification (AEC-Q101) required for automotive or mission-critical applications
• Lower reverse leakage current (200µA vs. 500µA) beneficial in low-power standby or precision rectification circuits
• Discontinued product status at DiGi Electronics requires verification of alternative supply sources before design commitment
• Higher junction capacitance (235pF) may impact high-frequency performance; evaluate switching frequency requirements

Compatibility Verification: Both parts share identical package (DO-214AA), mounting type (Surface Mount), voltage rating (40V), and compliance status (RoHS3, MSL 1). PCB footprints are interchangeable. Thermal management and current distribution must be verified for applications operating at or near the 2A limit of the CDBB240LR-HF when considering substitution with the higher-rated SSB44HR5G.

Frequently Asked Questions (FAQ)

Q: Can SSB44HR5G directly replace CDBB240LR-HF on an existing PCB?

A: Yes, from a physical and electrical standpoint. Both components use identical DO-214AA (SMB) package and surface mount configuration. PCB footprints are interchangeable. However, verify that your circuit design does not depend on the specific forward voltage or capacitance characteristics of the original part, as these parameters differ between the two devices.

Q: What is the primary difference between these two parts?

A: The SSB44HR5G is rated for 4A average rectified current compared to the CDBB240LR-HF's 2A rating, while maintaining the same 40V reverse voltage. The SSB44HR5G also features lower reverse leakage current (200µA vs. 500µA) and automotive-grade qualification (AEC-Q101). The CDBB240LR-HF remains the active product with current availability.

Q: Is SSB44HR5G suitable for my 2A application?

A: Yes. A substitute part with higher current rating (4A) is acceptable for applications requiring 2A or less. The component will operate within its safe operating area with margin. However, the higher forward voltage (500mV @ 4A vs. 450mV @ 2A) and higher capacitance (235pF vs. 30pF) may affect power dissipation and switching characteristics in precision applications.

Q: Why is SSB44HR5G listed as discontinued?

A: Discontinued status at DiGi Electronics indicates this distributor no longer stocks the part. The part may remain available through other authorized distributors or direct from Taiwan Semiconductor Corporation. Verify supply availability before committing to this substitute in new designs.

Q: Does the higher capacitance of SSB44HR5G affect my circuit?

A: Junction capacitance (235pF vs. 30pF) becomes significant in high-frequency switching applications (>1MHz). Higher capacitance increases switching losses and may slow switching transitions. For applications operating below 100kHz, this difference is typically negligible. Evaluate your circuit's switching frequency and transient response requirements.

Q: Are both parts RoHS3 compliant?

A: Yes. Both CDBB240LR-HF and SSB44HR5G are RoHS3 compliant with MSL 1 (unlimited moisture sensitivity), suitable for standard PCB assembly and storage conditions without special handling.

Q: What is AEC-Q101 qualification on SSB44HR5G?

A: AEC-Q101 is the automotive electronics council qualification standard for discrete semiconductors. SSB44HR5G meets this standard, making it suitable for automotive applications requiring higher reliability and temperature cycling performance. CDBB240LR-HF does not carry this qualification.

Q: Can I use CDBB240LR-HF in an automotive application?

A: CDBB240LR-HF is standard industrial-grade without automotive qualification. For automotive applications requiring AEC-Q101 compliance, SSB44HR5G is the appropriate choice, provided supply availability is confirmed.