CDBMHT1100-HF Equivalent & Substitute Parts

Part Overview

The CDBMHT1100-HF is a Schottky diode manufactured by Comchip Technology, rated for 100V DC reverse voltage and 1A average rectified current in a surface mount SOD-123HT package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The part demonstrates fast recovery characteristics suitable for switching applications and maintains full RoHS3 compliance.

Substiute Parts

CDBMHT1100-HF

Comchip TechnologyIn Stock: 15671CDBMHT1100-HF Datasheet

Current PartRFQ

CDBMS1100-HF

Comchip TechnologyIn Stock: 2799CDBMS1100-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDBMHT1100-HF is determined by equivalence across the following critical parameters:

Electrical Equivalence Criteria:

• Voltage - DC Reverse (Vr) (Max): 100V
• Current - Average Rectified (Io): 1A
• Technology: Schottky
• Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Mechanical & Environmental Criteria:

• Mounting Type: Surface Mount
• Operating Temperature Range: Compatible with -55°C to 150°C junction temperature
• RoHS3 Compliance: Required
• Moisture Sensitivity Level: MSL 1 (Unlimited)

The CDBMS1100-HF qualifies as a direct substitute based on matching all electrical specifications and compliance requirements. The primary difference is the package variant (SOD-123F versus SOD-123HT) and improved capacitance characteristics, with active product status enabling continued supply.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: CDBMS1100-HF

The CDBMS1100-HF is the recommended substitute for the obsolete CDBMHT1100-HF based on the following factors:

1. Electrical Equivalence: All critical electrical parameters match the original specification, including reverse voltage rating (100V), average rectified current (1A), reverse leakage current (500µA @ 100V), and recovery speed characteristics.

2. Compliance Status: Both parts maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, ensuring compatibility with existing supply chain and manufacturing processes.

3. Product Availability: The substitute part maintains active product status with documented inventory, providing reliable long-term supply compared to the obsolete original part.

4. Package Consideration: The CDBMS1100-HF uses SOD-123F packaging instead of SOD-123HT. PCB layout verification is required to confirm footprint compatibility, as both are surface mount variants but may have dimensional differences.

5. Performance Characteristics: The substitute exhibits improved forward voltage (830mV vs 850mV @ 1A) and reduced capacitance (25pF vs 120pF @ 4V, 1MHz), which may provide marginal performance benefits in switching applications.

6. Temperature Range: The substitute operates from -50°C to 150°C junction temperature, compared to -55°C to 150°C for the original. Applications requiring operation below -50°C require design review.

Frequently Asked Questions (FAQ)

Q: Can CDBMS1100-HF directly replace CDBMHT1100-HF without PCB modifications?

A: Electrical substitution is valid. However, package variant differences (SOD-123F vs SOD-123HT) require PCB footprint verification. Physical dimensions and pad layouts may differ, necessitating layout confirmation before implementation.

Q: What is the significance of the lower forward voltage in the substitute part?

A: The CDBMS1100-HF exhibits 830mV forward voltage versus 850mV for the original at 1A. This 20mV reduction represents improved efficiency characteristics and lower power dissipation in the diode, beneficial for thermal management in high-frequency switching applications.

Q: Are there any temperature range limitations when substituting?

A: The substitute part specifies -50°C to 150°C junction temperature, compared to -55°C to 150°C for the original. Applications requiring operation at temperatures below -50°C must be evaluated separately. Standard commercial and industrial applications typically operate within the substitute's range.

Q: How do the capacitance differences affect circuit performance?

A: The substitute exhibits significantly lower capacitance (25pF vs 120pF @ 4V, 1MHz). Lower capacitance reduces switching losses and improves high-frequency performance. Circuit designs sensitive to junction capacitance effects may experience improved switching characteristics with the substitute part.

Q: Is the packaging difference critical for my application?

A: SOD-123F and SOD-123HT are both surface mount packages but represent different physical variants. Verify PCB footprint compatibility with your design documentation. If footprints are identical, substitution is straightforward. If differences exist, PCB redesign or component placement adjustment may be required.

Q: What compliance certifications apply to both parts?

A: Both CDBMHT1100-HF and CDBMS1100-HF maintain ROHS3 compliance, MSL 1 (Unlimited) moisture sensitivity rating, and EAR99 export classification. No additional compliance verification is required for standard applications.

Q: Why is the original part obsolete?

A: The CDBMHT1100-HF is classified as obsolete, indicating discontinued manufacturing. The CDBMS1100-HF represents the active equivalent from the same manufacturer, providing continued access to equivalent functionality with improved specifications and reliable supply.