LLSD101C-TP Equivalent & Substitute Parts

Part Overview

The LLSD101C-TP is a Schottky diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 15 mA average rectified current in a Mini MELF surface mount package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design requirements and production continuity. Substitute parts are selected based on matching or exceeding electrical specifications while maintaining compatibility with surface mount assembly processes.

Key Parameters

Parameter	Value
Technology	Schottky
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
Mounting Type	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80
Operating Temperature - Junction	-55°C ~ 150°C
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitute parts for the LLSD101C-TP are classified into two categories based on electrical and mechanical compatibility:

Direct Equivalent (Package Variant): SD101CW-TP maintains identical electrical specifications (40 V, 15 mA, 900 mV forward voltage, 1 ns recovery time) with a different surface mount package (SOD-123 instead of Mini MELF). This part is suitable for designs where package footprint change is acceptable.

Functional Equivalents (Higher Current Rating): BAS81-GS08, BAS81-GS18, LL103A-GS08, and LL103A-GS18 are Schottky diodes with 40 V reverse voltage rating that exceed the 15 mA current requirement. These parts maintain the same reverse voltage specification and Schottky technology, with higher current capacity (30 mA or 200 mA) and compatible surface mount packages (SOD-80 Mini MELF). These substitutes are applicable in circuits where the 15 mA specification represents a design margin rather than a hard limit.

Key Parameters for Substitution Compatibility:

Voltage - DC Reverse (Vr) (Max): 40 V (required match)
Technology: Schottky (required match)
Mounting Type: Surface Mount (required match)
Current - Average Rectified (Io): 15 mA minimum (equal or higher acceptable)
RoHS Status: ROHS3 Compliant (required match)

Parameter Comparison

Parameter	LLSD101C-TP	SD101CW-TP	BAS81-GS08	BAS81-GS18	LL103A-GS08	LL103A-GS18
Manufacturer	Micro Commercial Co	Micro Commercial Co	Vishay	Vishay	Vishay	Vishay
Product Status	Obsolete	Active	Active	Active	Active	Active
Technology	Schottky	Schottky	Schottky	Schottky	Schottky	Schottky
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	40 V	40 V	40 V	40 V
Current - Average Rectified (Io)	15 mA	15 mA	30 mA	30 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	900 mV @ 15 mA	900 mV @ 15 mA	1 V @ 15 mA	1 V @ 15 mA	600 mV @ 200 mA	600 mV @ 200 mA
Reverse Recovery Time (trr)	1 ns	1 ns	Not specified	Not specified	10 ns	10 ns
Current - Reverse Leakage @ Vr	200 nA @ 30 V	200 nA @ 30 V	200 nA @ 40 V	200 nA @ 40 V	5 µA @ 30 V	5 µA @ 30 V
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AC, MINI-MELF, SOD-80	SOD-123	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80
Operating Temperature - Junction (Max)	150°C	125°C	125°C	125°C	125°C	125°C
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Not specified	Tape & Reel (TR)	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT)	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Qualification	Not specified	Not specified	Not specified	AEC-Q101	Not specified	Not specified

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance):

SD101CW-TP is the primary substitute when package footprint change is permissible. This part maintains all electrical specifications of the LLSD101C-TP (40 V, 15 mA, 900 mV forward voltage, 1 ns recovery time) and is currently in active production status. The SOD-123 package is smaller than Mini MELF, requiring PCB layout modification. Both parts are ROHS3 compliant with unlimited moisture sensitivity level.

For Higher Current Capacity Applications:

BAS81-GS08 and BAS81-GS18 provide 30 mA current capacity with identical 40 V reverse voltage rating and Mini MELF package compatibility. Both are manufactured by Vishay and maintain ROHS3 compliance. BAS81-GS18 includes AEC-Q101 automotive qualification, suitable for automotive-grade applications. These parts are appropriate for designs where the original 15 mA specification provides design margin.

LL103A-GS08 and LL103A-GS18 provide 200 mA current capacity with 40 V reverse voltage rating and Mini MELF package compatibility. These parts are manufactured by Vishay and maintain ROHS3 compliance. The higher current rating accommodates applications requiring greater current handling without voltage derating. Both variants are in active production with substantial inventory availability.

Temperature Consideration:

The LLSD101C-TP operates to 150°C junction temperature. All substitute parts are rated to 125°C maximum junction temperature. Applications requiring operation above 125°C require thermal analysis to confirm compatibility.

Frequently Asked Questions (FAQ)

Q: Can SD101CW-TP be used as a direct replacement for LLSD101C-TP?

A: SD101CW-TP is electrically equivalent with identical voltage, current, and forward voltage specifications. The primary difference is package format: SOD-123 versus Mini MELF. PCB layout modification is required. Both parts are ROHS3 compliant and currently in active production.

Q: What is the difference between BAS81-GS08 and BAS81-GS18?

A: Both parts are identical Schottky diodes with 40 V, 30 mA specifications and Mini MELF packaging. BAS81-GS18 includes AEC-Q101 automotive qualification and is supplied in Cut Tape format. BAS81-GS08 is supplied in Cut Tape & Digi-Reel format. Selection depends on packaging requirements and automotive qualification necessity.

Q: Can LL103A series parts replace LLSD101C-TP in all applications?

A: LL103A-GS08 and LL103A-GS18 have identical 40 V reverse voltage rating and Mini MELF package compatibility. The 200 mA current rating exceeds the 15 mA requirement. These parts are suitable for applications where the original 15 mA specification is not a hard limit. Reverse recovery time differs (10 ns versus 1 ns), which may affect high-frequency switching performance.

Q: What is the difference between LL103A-GS08 and LL103A-GS18?

A: Both parts are identical Schottky diodes with 40 V, 200 mA specifications and Mini MELF packaging. LL103A-GS08 is supplied in Cut Tape & Digi-Reel format. LL103A-GS18 is supplied in Tape & Reel format. Selection depends on packaging and handling requirements for production assembly.

Q: Are all substitute parts RoHS compliant?

A: All substitute parts listed (SD101CW-TP, BAS81-GS08, BAS81-GS18, LL103A-GS08, LL103A-GS18) are ROHS3 compliant, matching the compliance status of the LLSD101C-TP.

Q: What is the impact of higher current ratings on circuit design?

A: Substitute parts with higher current ratings (30 mA or 200 mA) are suitable for circuits designed for 15 mA operation. The higher rating provides design margin and does not degrade performance in lower-current applications. Forward voltage characteristics differ slightly; verify thermal performance in power-dissipation-critical applications.

Q: Can these parts be used interchangeably in the same PCB?

A: SD101CW-TP requires PCB layout modification due to different package (SOD-123). BAS81-GS08, BAS81-GS18, LL103A-GS08, and LL103A-GS18 are compatible with Mini MELF footprints and can be used interchangeably on existing LLSD101C-TP PCB layouts without modification.

Q: What is the maximum junction temperature for substitute parts?

A: All substitute parts are rated to 125°C maximum junction temperature. The original LLSD101C-TP is rated to 150°C. Applications requiring operation above 125°C require thermal analysis to confirm substitute part compatibility.

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