CDST-4148-G Equivalent & Substitute Parts

Part Overview

The CDST-4148-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 75V DC reverse voltage and 150mA average rectified current in a surface mount SOT-23-3 package. This part is classified as obsolete, necessitating identification of active equivalent alternatives for ongoing design support and procurement continuity. Substitute parts must maintain electrical and mechanical compatibility within the specified parameter ranges.

Substiute Parts

CDST-4148-G

Comchip TechnologyIn Stock: 11816CDST-4148-G Datasheet

Current PartRFQ

BAS16-HF

Comchip TechnologyIn Stock: 2343BAS16-HF Datasheet

MFR RecommendedRFQ

CDST-16-G

Comchip TechnologyIn Stock: 857CDST-16-G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the CDST-4148-G are qualified based on strict equivalence of the following electrical and mechanical parameters:

Critical Equivalence Parameters:

• Voltage - DC Reverse (Vr) (Max): 75 V
• Current - Average Rectified (Io): 150 mA
• Voltage - Forward (Vf) (Max) @ If: 1.25 V @ 150 mA
• Package / Case: TO-236-3, SC-59, SOT-23-3
• Mounting Type: Surface Mount
• Technology: Standard
• Operating Temperature - Junction (Max): 150 °C

Allowable Parameter Variations: Substitute parts may exhibit differences in Reverse Recovery Time (trr), Current - Reverse Leakage @ Vr, and Capacitance @ Vr, F within the ranges specified for small-signal rectifier diodes, provided all critical parameters remain equivalent.

Two substitute parts meet these criteria:

1. BAS16-HF (MFR Recommended): Active product status with identical electrical ratings and package specifications.
2. CDST-16-G (Parametric Equivalent): Active product status with identical electrical ratings and package specifications.

Parameter Comparison

Engineering Selection Recommendations

BAS16-HF is designated as the manufacturer-recommended substitute. This part carries active product status, ensuring long-term availability and supply chain continuity. It maintains full electrical equivalence across all critical parameters and is ROHS3 compliant with unlimited moisture sensitivity rating.

CDST-16-G is a parametric equivalent alternative, also with active product status. This part provides identical electrical performance and package compatibility. Selection between BAS16-HF and CDST-16-G may be determined by supplier availability, packaging format preference (Tape & Reel), or procurement lead time requirements.

Both substitutes exhibit lower reverse leakage current (1 µA versus 2.5 µA) and slightly extended reverse recovery time (6 ns versus 4 ns) compared to the obsolete CDST-4148-G. These variations remain within acceptable tolerances for standard small-signal rectifier diode applications and do not compromise functional equivalence.

Frequently Asked Questions (FAQ)

Q: Can BAS16-HF and CDST-16-G be used interchangeably with CDST-4148-G?

A: Yes. Both substitute parts maintain identical voltage ratings (75V), current ratings (150mA), forward voltage characteristics (1.25V @ 150mA), and package specifications (SOT-23-3). All three parts are surface mount devices with equivalent thermal ratings (150°C junction temperature).

Q: What is the difference between the two substitute parts?

A: BAS16-HF and CDST-16-G are electrically identical across all critical parameters. Both are manufactured by Comchip Technology and carry active product status. The primary difference is packaging format: BAS16-HF is supplied in Tape & Reel format, while CDST-16-G is also supplied in Tape & Reel format. Selection may depend on supplier availability or procurement preferences.

Q: Why does the obsolete CDST-4148-G have lower reverse leakage current than the substitutes?

A: The CDST-4148-G specifies 2.5 µA reverse leakage at 75V, while both BAS16-HF and CDST-16-G specify 1 µA at the same voltage. This represents an improvement in the substitute parts. Lower reverse leakage current is beneficial for circuit performance and does not create compatibility issues.

Q: Are there any thermal or reliability differences between these parts?

A: All three parts share identical maximum junction operating temperature (150°C) and moisture sensitivity level (MSL 1, Unlimited). No thermal or reliability trade-offs exist between the main part and substitutes.

Q: What is the significance of the reverse recovery time difference?

A: The CDST-4148-G specifies 4 ns reverse recovery time, while substitutes specify 6 ns. Both values fall within the small-signal rectifier diode category (≤200mA). This 2 ns difference is negligible for standard rectification applications and does not affect functional compatibility.

Q: Are all parts RoHS compliant?

A: Yes. CDST-4148-G, BAS16-HF, and CDST-16-G are all ROHS3 compliant with REACH unaffected status, ensuring regulatory compliance for current manufacturing and assembly standards.

Q: Can I mix these parts in the same production batch?

A: Yes. All three parts are electrically and mechanically equivalent within the specified parameter ranges and carry identical compliance certifications. PCB layout and assembly processes require no modification when substituting between these parts.