SD101A-T Schottky Diode Equivalent & Substitute Parts

Part Overview

The SD101A-T is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 60 V DC reverse voltage and 15 mA average rectified current in a through-hole DO-35 package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with modified parameters suitable for specific application requirements.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	60	V
Current - Average Rectified (Io)	15	mA
Voltage - Forward (Vf) (Max) @ If	1	V @ 15 mA
Reverse Recovery Time (trr)	1	ns
Current - Reverse Leakage @ Vr	200	nA @ 50 V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction	-65 to 175	°C
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SD101A-T is determined by alignment of the following critical parameters: Schottky technology classification, voltage rating (60 V minimum), current rating (15 mA minimum), forward voltage characteristics, reverse recovery time, and package compatibility. Substitute parts are grouped into three categories based on substitution type:

Direct Equivalent (Package Variant): Parts maintaining identical electrical specifications with alternative mounting technology. The SD101AW-7-F represents a direct electrical equivalent with surface-mount SOD-123 packaging, enabling substitution in redesigned circuit layouts.

Upgrade Equivalent (Enhanced Specifications): Parts exceeding the minimum electrical requirements while maintaining through-hole DO-35 packaging. The 1N6263 provides identical voltage and current ratings with extended junction temperature range and marginally improved capacitance characteristics.

Functional Substitute (Parameter Relaxation): Parts with relaxed electrical specifications suitable for applications where the full SD101A-T performance envelope is not required. The 1N5711 and BAT42 offer higher voltage or current ratings, accommodating designs with modified performance margins.

Parameter Comparison

Parameter	SD101A-T	SD101AW-7-F	1N6263	1N5711	BAT42
Manufacturer	Diodes Incorporated	Diodes Incorporated	STMicroelectronics	Microchip Technology	STMicroelectronics
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	60 V	60 V	60 V	70 V	30 V
Current - Average Rectified (Io)	15 mA	15 mA	15 mA	33 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 15 mA	1 V @ 15 mA	1 V @ 15 mA	1 V @ 15 mA	1 V @ 200 mA
Reverse Recovery Time (trr)	1 ns	—	—	1 ns	5 ns
Current - Reverse Leakage @ Vr	200 nA @ 50 V	200 nA @ 50 V	200 nA @ 50 V	200 nA @ 50 V	500 nA @ 25 V
Capacitance @ Vr, F	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	2.2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	7 pF @ 1V, 1MHz
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole
Package / Case	DO-35	SOD-123	DO-35	DO-35	DO-35
Operating Temperature - Junction	-65 to 175°C	-65 to 125°C	-65 to 200°C	-65 to 150°C	-65 to 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

The SD101AW-7-F is the direct electrical equivalent of the SD101A-T, maintaining 60 V reverse voltage, 15 mA current rating, and identical forward voltage characteristics. This part is manufactured by the same supplier (Diodes Incorporated) and carries active product status with ROHS3 compliance. Selection of SD101AW-7-F requires circuit board redesign to accommodate surface-mount SOD-123 packaging in place of through-hole DO-35 mounting. Operating temperature range is reduced to -65 to 125°C compared to the original -65 to 175°C specification.

For Through-Hole Replacement with Enhanced Specifications:

The 1N6263 manufactured by STMicroelectronics provides identical voltage and current ratings in the original DO-35 through-hole package. This part offers extended junction temperature range (-65 to 200°C) and maintains ROHS3 compliance with active product status. Capacitance specification is marginally higher at 2.2 pF versus 2 pF, representing negligible deviation for most applications.

For Applications Requiring Higher Performance Margins:

The 1N5711 manufactured by Microchip Technology provides 70 V reverse voltage and 33 mA current rating in DO-35 through-hole packaging. This part maintains 1 ns reverse recovery time and ROHS3-equivalent electrical characteristics. However, this part carries RoHS non-compliant status, requiring evaluation against regulatory requirements for the end application.

For High-Current Applications:

The BAT42 manufactured by STMicroelectronics provides 200 mA current rating with 30 V reverse voltage in DO-35 through-hole packaging. This part is suitable only for applications where the 60 V reverse voltage specification is not required. BAT42 exhibits higher reverse leakage current (500 nA @ 25 V) and longer reverse recovery time (5 ns) compared to the SD101A-T.

Frequently Asked Questions (FAQ)

Q: Can the SD101AW-7-F be used as a direct replacement for the SD101A-T without circuit modification?

A: The SD101AW-7-F is electrically equivalent but requires circuit board redesign. The original SD101A-T uses through-hole DO-35 axial packaging, while the SD101AW-7-F uses surface-mount SOD-123 packaging. Direct socket substitution is not possible without board layout changes.

Q: What is the primary difference between the 1N6263 and the SD101A-T?

A: The 1N6263 maintains identical voltage (60 V) and current (15 mA) ratings with the same DO-35 through-hole package. The primary differences are extended junction temperature range (-65 to 200°C versus -65 to 175°C) and marginally higher capacitance (2.2 pF versus 2 pF). Both parts are ROHS3 compliant with active product status.

Q: Is the 1N5711 a suitable replacement for the SD101A-T?

A: The 1N5711 provides higher voltage (70 V) and current (33 mA) ratings in the same DO-35 through-hole package. It maintains identical forward voltage and reverse recovery time characteristics. However, the 1N5711 carries RoHS non-compliant status, which may restrict use in regulated applications. Regulatory compliance verification is required before selection.

Q: Why is the BAT42 not recommended as a primary substitute?

A: The BAT42 has a maximum reverse voltage rating of 30 V, which is insufficient for the 60 V specification of the SD101A-T. While it provides higher current capacity (200 mA), it cannot be used in circuits requiring the full 60 V reverse voltage rating. The BAT42 is suitable only for applications with relaxed voltage requirements.

Q: What are the inventory considerations for substitute part selection?

A: The SD101AW-7-F has 9,594 pieces in stock, the 1N6263 has 3,200 pieces, the 1N5711 has 47,190 pieces, and the BAT42 has 45,200 pieces available. The original SD101A-T has 1,012 pieces in stock with obsolete status. Inventory availability should be evaluated against production volume and lead-time requirements.

Q: Are all substitute parts RoHS compliant?

A: The SD101AW-7-F, 1N6263, and BAT42 are ROHS3 compliant. The 1N5711 is RoHS non-compliant. Regulatory requirements for the end application determine whether RoHS compliance is mandatory for substitute part selection.

Q: What is the operating temperature range consideration for substitute selection?

A: The SD101A-T operates from -65 to 175°C. The SD101AW-7-F and BAT42 are limited to -65 to 125°C, the 1N5711 to -65 to 150°C, and the 1N6263 extends to -65 to 200°C. Applications requiring operation above 125°C must select either the original SD101A-T or the 1N6263.

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