CDST-116-G Equivalent & Substitute Parts

Part Overview

The CDST-116-G is a general-purpose rectifier diode manufactured by Comchip Technology, rated for 75V DC reverse voltage with 215mA average rectified current in a surface mount SOT-23-3 package. This component is classified as obsolete, making identification of equivalent substitute parts essential for ongoing design support and procurement continuity. The fast recovery characteristics (≤500ns) and compact form factor position this diode for applications requiring efficient switching performance in low-voltage rectification circuits.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	215	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 150	V @ mA
Speed Classification	Fast Recovery ≤500ns, >200mA	—
Reverse Recovery Time (trr)	3	ns
Current - Reverse Leakage @ Vr	5	µA @ 75V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Package / Case	SOT-23-3 (TO-236-3, SC-59)	—
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the CDST-116-G is determined by strict equivalence across the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 75V
Current - Average Rectified (Io): 215mA
Voltage - Forward (Vf) (Max) @ If: 1.25V @ 150mA
Speed Classification: Fast Recovery ≤500ns, >200mA
Package / Case: SOT-23-3 (TO-236-3, SC-59)
Operating Temperature - Junction (Max): 150°C

Compliance Parameters:

RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

The MMBD4148,215 manufactured by Nexperia USA Inc. meets all mandatory matching parameters and compliance requirements, establishing it as a parametric equivalent substitute for the obsolete CDST-116-G.

Parameter Comparison

Parameter	CDST-116-G (Comchip)	MMBD4148,215 (Nexperia)	Match Status
Voltage - DC Reverse (Vr) (Max)	75 V	75 V	Equivalent
Current - Average Rectified (Io)	215 mA	215 mA	Equivalent
Voltage - Forward (Vf) (Max) @ If	1.25 V @ 150 mA	1.25 V @ 150 mA	Equivalent
Speed Classification	Fast Recovery ≤500ns, >200mA	Fast Recovery ≤500ns, >200mA	Equivalent
Reverse Recovery Time (trr)	3 ns	4 ns	Within Tolerance
Current - Reverse Leakage @ Vr	5 µA @ 75 V	500 nA @ 75 V	Substitute Superior
Capacitance @ Vr, F	2 pF @ 0V, 1MHz	1.5 pF @ 0V, 1MHz	Substitute Superior
Package / Case	SOT-23-3	SOT-23-3	Equivalent
Operating Temperature - Junction (Max)	150°C	150°C	Equivalent
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent
Product Status	Obsolete	Active	Substitute Available

Engineering Selection Recommendations

The MMBD4148,215 from Nexperia USA Inc. is the direct parametric equivalent for the obsolete CDST-116-G. Selection of this substitute is supported by:

Product Status: The MMBD4148,215 maintains active product status with 4400 units in stock, ensuring long-term availability compared to the obsolete CDST-116-G (987 units, no further production).

Electrical Equivalence: All critical electrical parameters match exactly: 75V reverse voltage rating, 215mA average rectified current, 1.25V forward voltage drop at 150mA, and fast recovery speed classification. The reverse recovery time of 4ns versus 3ns remains within the fast recovery specification envelope (≤500ns).

Performance Advantages: The MMBD4148,215 demonstrates superior performance characteristics with reverse leakage current of 500nA (versus 5µA) and lower junction capacitance of 1.5pF (versus 2pF), providing improved switching efficiency and reduced parasitic effects.

Compliance Certification: Both components maintain ROHS3 compliance and MSL Level 1 (unlimited moisture sensitivity), ensuring compatibility with modern manufacturing and storage requirements.

Package Compatibility: Identical SOT-23-3 surface mount package enables direct PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can the MMBD4148,215 be used as a direct replacement for CDST-116-G in existing designs?

A: Yes. The MMBD4148,215 is a parametric equivalent with identical voltage rating (75V), current rating (215mA), forward voltage (1.25V @ 150mA), and package (SOT-23-3). No circuit modifications are required.

Q: What is the significance of the difference in reverse recovery time (3ns vs 4ns)?

A: Both values fall within the fast recovery classification (≤500ns for >200mA). The 1ns difference is negligible for general-purpose rectification applications and does not affect functional compatibility.

Q: Why is the reverse leakage current lower in the MMBD4148,215?

A: The MMBD4148,215 exhibits 500nA leakage versus 5µA in the CDST-116-G. This represents improved semiconductor manufacturing and represents a performance advantage, not a compatibility issue. Lower leakage reduces power dissipation in standby conditions.

Q: Are there any packaging differences between these parts?

A: Both components use the SOT-23-3 package designation (also referenced as TO-236-3 or SC-59). The MMBD4148,215 is supplied in Tape & Reel (TR) format, while the CDST-116-G packaging format was not specified. This does not affect electrical compatibility or PCB mounting.

Q: What compliance certifications apply to the MMBD4148,215?

A: The MMBD4148,215 is ROHS3 compliant and REACH unaffected, matching the compliance profile of the CDST-116-G. Both components carry MSL Level 1 (unlimited moisture sensitivity), requiring standard ESD and moisture control during handling.

Q: Is the MMBD4148,215 suitable for high-frequency switching applications?

A: Yes. The fast recovery characteristic (≤500ns) and low reverse recovery time (4ns) support high-frequency switching. The lower junction capacitance (1.5pF) of the MMBD4148,215 provides additional advantage for frequency-sensitive applications.

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