CDBMT220L-HF Schottky Diode Equivalent & Substitute Parts

Part Overview

The CDBMT220L-HF is an active Schottky rectifier diode manufactured by Comchip Technology, rated for 20V DC reverse voltage and 2A average rectified current in a surface mount SOD-123H 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 MSL Level 1 (unlimited moisture sensitivity) and maintains active product status with 1014 units in current inventory.

Equivalent and substitute parts are identified when alternative manufacturers offer Schottky diodes with compatible electrical ratings and mechanical packaging that satisfy the same circuit requirements without design modification.

Substiute Parts

CDBMT220L-HF

Comchip TechnologyIn Stock: 1052CDBMT220L-HF Datasheet

Current PartRFQ

SS12FP

Fairchild SemiconductorIn Stock: 155383SS12FP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBMT220L-HF is determined by strict equivalence of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): Must equal or exceed 20V
• Current - Average Rectified (Io): Must equal or exceed 2A
• Technology: Must be Schottky diode type
• Package / Case: Must be SOD-123H or compatible surface mount variant
• Speed: Must support Fast Recovery ≤ 500ns at currents > 200mA
• Mounting Type: Must be Surface Mount

Secondary Compatibility Factors:

• Forward voltage (Vf) characteristics at rated current
• Reverse leakage current at rated voltage
• Operating temperature range
• Regulatory compliance (RoHS, REACH, ECCN)

The substitute part SS12FP from Fairchild Semiconductor is identified based on matching voltage rating (20V), compatible package designation (SOD-123H), Schottky technology, and fast recovery speed specification. Current rating differences and other parameter variations are documented in the comparison table below.

Parameter Comparison

Engineering Selection Recommendations

CDBMT220L-HF (Primary Selection): The CDBMT220L-HF remains the primary component choice when specified in original designs. It is actively manufactured, ROHS3 compliant, and rated for 2A average rectified current with 20V reverse voltage in SOD-123H packaging. Current inventory of 1014 units supports immediate procurement. This part is suitable for general industrial and consumer applications requiring Schottky rectification.

SS12FP (Substitute Selection): The SS12FP from Fairchild Semiconductor is a qualified substitute when CDBMT220L-HF availability is constrained. Both parts share identical voltage ratings (20V), package form factor (SOD-123H), Schottky technology, and fast recovery speed specifications (≤500ns). The SS12FP carries automotive-grade qualification (AEC-Q101) and extended operating temperature range (-55°C to 150°C versus -55°C to 100°C).

Critical Substitution Limitation: The SS12FP is rated for 1A average rectified current, which is 50% of the CDBMT220L-HF rating. Substitution is valid only in circuits where the actual operating current does not exceed 1A. Circuits requiring sustained 2A operation must use the CDBMT220L-HF or identify alternative parts with equivalent 2A ratings.

Compliance Considerations: Both parts are designated ECCN EAR99 and HTSUS 8541.10.0080. The CDBMT220L-HF carries explicit ROHS3 compliance certification. The SS12FP automotive qualification (AEC-Q101) provides additional reliability assurance for automotive and high-reliability applications.

Frequently Asked Questions (FAQ)

Q: Can SS12FP directly replace CDBMT220L-HF in all applications?

A: No. While both parts share 20V voltage rating, SOD-123H packaging, and Schottky technology, the SS12FP is rated for 1A average rectified current compared to the CDBMT220L-HF at 2A. Substitution is valid only when circuit operating current does not exceed 1A. For applications requiring 2A operation, the CDBMT220L-HF must be used.

Q: What are the key electrical differences between these parts?

A: The primary difference is current rating: CDBMT220L-HF at 2A versus SS12FP at 1A. Secondary differences include forward voltage (380mV @ 2A for CDBMT220L-HF versus 450mV @ 1A for SS12FP), reverse leakage current (1mA versus 400µA at 20V), and junction capacitance (160pF versus 80pF). Operating temperature range differs: CDBMT220L-HF operates to 100°C while SS12FP extends to 150°C.

Q: Are the package designations identical?

A: Both parts use SOD-123H package form factor for surface mount assembly. The supplier device package designation differs slightly (SOD-123H for CDBMT220L-HF versus SOD-123HE for SS12FP), but both are mechanically and electrically compatible for PCB placement and soldering.

Q: Does SS12FP carry any additional certifications?

A: Yes. The SS12FP holds automotive-grade qualification (AEC-Q101) and is designated as automotive-grade component. The CDBMT220L-HF does not carry automotive qualification but is ROHS3 compliant. Selection between these certifications depends on application requirements.

Q: What is the impact of different reverse leakage currents?

A: The CDBMT220L-HF exhibits 1mA reverse leakage at 20V, while SS12FP shows 400µA at the same voltage. Lower leakage in the SS12FP may provide marginal benefits in low-power or precision analog circuits, but both values are within typical Schottky diode specifications for general rectification applications.

Q: Can these parts be used interchangeably in high-temperature environments?

A: The SS12FP supports operation to 150°C junction temperature, exceeding the CDBMT220L-HF maximum of 100°C. For applications requiring sustained operation above 100°C, the SS12FP is the appropriate choice. For applications limited to 100°C or below, both parts are suitable.

Q: What inventory considerations apply to these parts?

A: The CDBMT220L-HF has 1014 units in current stock. The SS12FP has significantly higher inventory at 155,300 units. When supply chain constraints affect CDBMT220L-HF availability and current requirements do not exceed 1A, the SS12FP offers superior supply security.