CDSSC4148N-G Equivalent & Substitute Parts

Part Overview

The CDSSC4148N-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 100 V DC reverse voltage and 150 mA average rectified current in a 0805 surface mount package. This component is classified as obsolete, necessitating identification of active equivalent parts for new designs and ongoing production requirements. The small signal diode technology with 4 ns reverse recovery time supports high-frequency switching applications.

Substiute Parts

CDSSC4148N-G

Comchip TechnologyIn Stock: 849CDSSC4148N-G Datasheet

Current PartRFQ

CDSF4148-HF

Comchip TechnologyIn Stock: 883CDSF4148-HF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CDSSC4148N-G is determined by the following electrical and mechanical criteria:

Primary Substitution Criteria:

• Current rating: 150 mA average rectified current (Io) must be maintained or exceeded
• Reverse recovery time: 4 ns small signal performance classification
• Reverse leakage current: Maximum 5 µA @ 75 V
• Capacitance: 4 pF @ 0V, 1MHz
• Mounting type: Surface mount technology
• Technology class: Standard small signal diode

Secondary Considerations:

• Reverse voltage rating: The main part is rated 100 V; substitutes with lower voltage ratings (75 V) are acceptable only in applications where the circuit maximum reverse voltage does not exceed the substitute rating
• Package compatibility: Physical dimensions and footprint must accommodate board layout constraints
• Product status: Active parts are preferred for long-term availability

The CDSF4148-HF qualifies as a functional substitute based on matching current rating, reverse recovery time, leakage current, and capacitance specifications, despite differences in reverse voltage rating and package form factor.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The CDSSC4148N-G is classified as obsolete. The CDSF4148-HF is an active product from the same manufacturer, ensuring continued availability and supply chain stability for new designs and production continuity.

Compliance and Certification: The CDSF4148-HF carries ROHS3 compliance certification, meeting current environmental and regulatory requirements for electronic components in regulated markets. Both parts maintain REACH Unaffected status and EAR99 export classification.

Electrical Compatibility: The substitute part maintains the critical electrical parameters: 150 mA current rating, 4 ns reverse recovery time, and 4 pF capacitance. The reverse voltage rating is reduced from 100 V to 75 V; this substitution is valid only in circuits where the maximum reverse voltage applied to the diode does not exceed 75 V.

Thermal Performance: The main part operates to 150°C junction temperature; the substitute operates to 125°C. Applications requiring operation above 125°C junction temperature require thermal analysis to confirm the substitute is suitable.

Package Footprint: The substitute uses a 1005 (2512 Metric) package compared to the 0805 (2012 Metric) main part. PCB layout modifications are required to accommodate the larger package dimensions.

Frequently Asked Questions (FAQ)

Q: Can CDSF4148-HF directly replace CDSSC4148N-G without circuit modification?

A: Electrical substitution is valid if the circuit maximum reverse voltage does not exceed 75 V. Physical substitution requires PCB layout changes due to package size difference (0805 to 1005). Thermal design must confirm operation within 125°C junction temperature limit.

Q: What is the significance of the reverse voltage rating difference (100 V vs. 75 V)?

A: The reverse voltage rating defines the maximum reverse bias voltage the diode can withstand without breakdown. In applications where reverse voltage remains below 75 V, the substitute performs identically. In circuits designed for 100 V reverse voltage margin, the substitute reduces safety margin by 25 V.

Q: Are the forward voltage characteristics equivalent?

A: The main part specifies 1.25 V @ 100 mA; the substitute specifies 1 V @ 50 mA. These measurements are at different current levels, making direct comparison imprecise. Both parts exhibit typical small signal diode forward characteristics suitable for general-purpose rectification.

Q: Does the package size change affect circuit performance?

A: Package size (0805 vs. 1005) affects PCB layout, trace routing, and thermal dissipation area. Electrical performance is not affected by package size alone. Thermal performance may improve slightly due to larger package surface area.

Q: Is the CDSF4148-HF suitable for high-frequency switching applications?

A: Both parts are classified as small signal diodes with 4 ns reverse recovery time, supporting high-frequency switching. The substitute maintains this performance characteristic.

Q: What is the impact of the 25°C lower maximum junction temperature on the substitute?

A: The substitute operates to 125°C maximum junction temperature compared to 150°C for the main part. Thermal design must ensure the substitute does not exceed 125°C in the application. This may require additional thermal management or derating in high-power or high-ambient-temperature environments.

Q: Are both parts available in the same packaging format (Tape & Reel)?

A: The main part packaging is not specified. The substitute is available in Tape & Reel (TR) format, standard for production assembly. Confirm packaging availability for the main part if required for specific procurement or assembly processes.