SD101B-T Schottky Diode Equivalent & Substitute Parts

Part Overview

The SD101B-T is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 50 V DC reverse voltage and 15 mA average rectified current in a through-hole DO-35 package. The device is classified as obsolete, necessitating identification of equivalent and substitute components for ongoing design support and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives with modified parameters suitable for specific application requirements.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	15	mA
Voltage - Forward (Vf) (Max) @ If	950 mV @ 15 mA	mV
Reverse Recovery Time (trr)	1	ns
Current - Reverse Leakage @ Vr	200 nA @ 40 V	nA
Capacitance @ Vr, F	2.1 pF @ 0V, 1MHz	pF
Technology	Schottky	—
Mounting Type	Through Hole	—
Package / Case	DO-204AH, DO-35, Axial	—
Operating Temperature - Junction	-65°C ~ 175°C	°C
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the SD101B-T is determined by the following critical parameters: reverse voltage rating (Vr), average rectified current (Io), forward voltage drop (Vf), reverse recovery time (trr), and package type. Equivalent parts must maintain identical or superior electrical characteristics within the same package family. Substitute parts may deviate in current rating, voltage rating, or package configuration while remaining functionally compatible within defined application constraints.

The substitute parts are grouped into three categories:

Direct Manufacturer Equivalent (Same Electrical Specifications, Different Package): SD101BW-7-F maintains identical voltage and current ratings with surface-mount SOD-123 packaging.

Parametric Equivalent (Same Package, Enhanced Current Rating): SD101B-TAP provides identical voltage rating with doubled current capacity (30 mA) in the same through-hole DO-35 package.

Manufacturer Recommended Alternatives (Modified Electrical Specifications): 1N6263, BAT42, and BAT43 provide alternative voltage and current combinations suitable for applications where the original specifications exceed circuit requirements.

Parameter Comparison

Parameter	SD101B-T	SD101BW-7-F	SD101B-TAP	1N6263	BAT42	BAT43
Manufacturer	Diodes Inc.	Diodes Inc.	Vishay	STMicroelectronics	STMicroelectronics	STMicroelectronics
Vr (Max) [V]	50	50	50	60	30	30
Io [mA]	15	15	30	15	200	200
Vf (Max) @ If [mV]	950 @ 15 mA	950 @ 15 mA	950 @ 15 mA	1000 @ 15 mA	1000 @ 200 mA	1000 @ 200 mA
trr [ns]	1	1	Not specified	Not specified	5	5
Ir @ Vr [nA]	200 @ 40 V	200 @ 40 V	200 @ 40 V	200 @ 50 V	500 @ 25 V	500 @ 25 V
Capacitance @ Vr [pF]	2.1 @ 0V	2.1 @ 0V	2.1 @ 0V	2.2 @ 0V	7 @ 1V	7 @ 1V
Mounting Type	Through Hole	Surface Mount	Through Hole	Through Hole	Through Hole	Through Hole
Package	DO-35	SOD-123	DO-35	DO-35	DO-35	DO-35
Tj (Max) [°C]	175	125	125	200	125	125
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	Request verification	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Package Replacement (Through-Hole DO-35):

SD101B-TAP is the primary through-hole substitute, offering identical 50 V reverse voltage rating with enhanced 30 mA current capacity. This part is manufactured by Vishay and carries AEC-Q101 automotive qualification with ROHS3 compliance. The increased current rating provides design margin for applications operating near the original 15 mA specification.

For Surface-Mount Applications:

SD101BW-7-F provides electrical equivalence to the SD101B-T with identical 50 V / 15 mA specifications in SOD-123 surface-mount packaging. This Diodes Incorporated part is active and ROHS3 compliant, suitable for PCB designs requiring compact form factors.

For Voltage-Rated Alternatives:

1N6263 (STMicroelectronics) offers superior 60 V reverse voltage rating with identical 15 mA current in DO-35 through-hole package. This part supports extended operating temperature range to 200°C and is ROHS3 compliant.

For Current-Rated Alternatives:

BAT42 and BAT43 (both STMicroelectronics) provide 200 mA current capacity in DO-35 through-hole package with reduced 30 V reverse voltage rating. These parts are suitable for applications where the original 50 V specification exceeds circuit requirements and higher current handling is beneficial. Both are ROHS3 compliant and active products.

All substitute parts maintain Schottky technology classification and small-signal speed characteristics. Product status verification confirms all recommended substitutes are active components with established supply chains.

Frequently Asked Questions (FAQ)

Q: Can SD101BW-7-F replace SD101B-T in a through-hole PCB design?

A: No. SD101BW-7-F uses SOD-123 surface-mount packaging, which is incompatible with through-hole PCB layouts. For through-hole applications, use SD101B-TAP or 1N6263.

Q: What is the primary difference between SD101B-TAP and the original SD101B-T?

A: SD101B-TAP maintains identical 50 V reverse voltage and forward voltage characteristics but provides doubled current capacity (30 mA versus 15 mA). Both use DO-35 through-hole packaging. SD101B-TAP is manufactured by Vishay and carries AEC-Q101 automotive qualification.

Q: Can BAT42 or BAT43 be used as direct replacements?

A: BAT42 and BAT43 are functional alternatives only for applications where 30 V reverse voltage is sufficient. These parts provide 200 mA current capacity, significantly exceeding the original 15 mA specification. They are not direct replacements but are suitable for designs with lower voltage requirements and higher current demands.

Q: Why does 1N6263 have a higher reverse voltage rating than the original SD101B-T?

A: 1N6263 is rated for 60 V reverse voltage compared to the SD101B-T's 50 V. This higher rating provides additional design margin and is compatible with applications designed for 50 V operation. The part maintains identical 15 mA current rating and DO-35 through-hole packaging.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts (SD101BW-7-F, SD101B-TAP, 1N6263, BAT42, BAT43) are ROHS3 compliant. The original SD101B-T requires RoHS status verification due to its obsolete classification.

Q: What is the impact of different reverse recovery times on substitution?

A: The original SD101B-T specifies 1 ns reverse recovery time. BAT42 and BAT43 specify 5 ns. For high-frequency switching applications, the faster 1 ns recovery time of SD101B-T and SD101BW-7-F may be preferred. For standard rectification applications, the 5 ns specification is functionally acceptable.

Q: Can SD101B-T be replaced with BAT42 in a 50 V circuit?

A: No. BAT42 is rated for maximum 30 V reverse voltage. Using it in a 50 V circuit exceeds the component's voltage specification and creates reliability risk. Use 1N6263 or SD101B-TAP for 50 V applications.

Q: What packaging options are available for equivalent parts?

A: Through-hole DO-35 packages are available in SD101B-TAP, 1N6263, BAT42, and BAT43. Surface-mount SOD-123 packaging is available in SD101BW-7-F. Package selection depends on PCB assembly technology and design requirements.

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