SD101C-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SD101C-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 15 mA average rectified current in a DO-35 through-hole package. This component is classified as obsolete, necessitating identification of active equivalent parts for ongoing design requirements and production continuity. Substitute parts must maintain functional compatibility within the electrical and mechanical constraints of the original specification.

Key Parameters

Parameter	SD101C-TP
Voltage - DC Reverse (Vr) (Max)	40 V
Current - Average Rectified (Io)	15 mA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 15 mA
Reverse Recovery Time (trr)	1 ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V
Technology	Schottky
Mounting Type	Through Hole
Package / Case	DO-204AH, DO-35, Axial
Operating Temperature - Junction (Max)	125°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the obsolete SD101C-TP requires identification of active Schottky diodes that satisfy the following criteria:

Mandatory Compatibility Parameters:

Technology: Schottky rectifier diode
Mounting Type: Through Hole
Package / Case: DO-35 (DO-204AH, Axial)
Voltage - DC Reverse (Vr): Equal to or greater than 40 V
Current - Average Rectified (Io): Equal to or greater than 15 mA
RoHS Compliance: ROHS3 Compliant

The BAT42 manufactured by STMicroelectronics meets the package and technology requirements. However, the BAT42 is rated for 30 V maximum reverse voltage, which is below the 40 V specification of the SD101C-TP. The BAT42 is therefore suitable only for applications where the actual operating reverse voltage does not exceed 30 V, despite the original design specification of 40 V.

Parameter Comparison

Parameter	SD101C-TP (Micro Commercial Co)	BAT42 (STMicroelectronics)
Voltage - DC Reverse (Vr) (Max)	40 V	30 V
Current - Average Rectified (Io)	15 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 15 mA	1 V @ 200 mA
Reverse Recovery Time (trr)	1 ns	5 ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	500 nA @ 25 V
Technology	Schottky	Schottky
Mounting Type	Through Hole	Through Hole
Package / Case	DO-35	DO-35
Operating Temperature - Junction	125°C (Max)	-65°C ~ 125°C
Product Status	Obsolete	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

The BAT42 is an active product with established supply availability and ROHS3 compliance, making it suitable for replacement in applications where the circuit design accommodates a 30 V maximum reverse voltage rating. The BAT42 provides superior current handling capability (200 mA versus 15 mA) and extended operating temperature range (-65°C to 125°C versus 125°C maximum).

Selection of the BAT42 as a substitute requires verification that the actual reverse voltage stress in the application circuit does not exceed 30 V. The BAT42 exhibits higher forward voltage drop (1 V @ 200 mA) and longer reverse recovery time (5 ns versus 1 ns) compared to the SD101C-TP, which may affect circuit performance in high-frequency or precision applications.

Frequently Asked Questions (FAQ)

Q: Can the BAT42 directly replace the SD101C-TP in all applications?

A: The BAT42 is mechanically and functionally compatible in terms of package type (DO-35 through-hole) and technology (Schottky). However, the BAT42 maximum reverse voltage rating of 30 V is lower than the SD101C-TP specification of 40 V. Substitution is valid only when the actual circuit reverse voltage stress remains below 30 V.

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

A: The SD101C-TP is rated for 40 V reverse voltage with 1 ns reverse recovery time, while the BAT42 is rated for 30 V reverse voltage with 5 ns reverse recovery time. The BAT42 supports higher average rectified current (200 mA versus 15 mA) and exhibits higher forward voltage drop at rated current.

Q: Are both parts RoHS compliant?

A: Yes, both the SD101C-TP and BAT42 are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the impact of the longer reverse recovery time in the BAT42?

A: The BAT42 reverse recovery time of 5 ns is longer than the SD101C-TP specification of 1 ns. In high-frequency switching applications, this difference may introduce additional switching losses and affect circuit timing. Applications operating at low frequencies or DC conditions are not affected by this parameter difference.

Q: Can the BAT42 be used in circuits designed for 40 V operation?

A: The BAT42 is rated for 30 V maximum reverse voltage and must not be used in circuits where reverse voltage stress exceeds this limit. Use of the BAT42 in 40 V circuits requires circuit redesign or voltage limiting measures to ensure the diode reverse voltage does not exceed 30 V.

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