LLSD101B-7 Equivalent & Substitute Parts

Part Overview

The LLSD101B-7 is a Schottky diode manufactured by Diodes Incorporated, rated for 50V DC reverse voltage with 15mA average rectified current. The device is packaged in a Mini MELF (DO-213AC, SOD-80) surface mount configuration and operates across a junction temperature range of -55°C to 125°C. This part is classified as obsolete, necessitating identification of equivalent substitute components that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

LLSD101B-7

Diodes IncorporatedIn Stock: 769LLSD101B-7 Datasheet

Current PartRFQ

SD101BW-7-F

Diodes IncorporatedIn Stock: 16111SD101BW-7-F Datasheet

MFR RecommendedRFQ

BAS86,115

Nexperia USA Inc.In Stock: 17099BAS86,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LLSD101B-7 is determined by strict equivalence across the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 50V minimum
• Current - Average Rectified (Io): 15mA minimum
• Technology: Schottky
• Mounting Type: Surface Mount
• Package compatibility: DO-213AC/MINI-MELF/SOD-80 or equivalent surface mount packages

Secondary Compatibility Parameters:

• Voltage - Forward (Vf) (Max): 950mV or lower at rated current
• Reverse Recovery Time (trr): 1ns or lower
• Current - Reverse Leakage @ Vr: 200nA or lower at 40V
• Operating Temperature Range: -55°C to 125°C minimum

Two substitute parts meet these criteria with varying degrees of parameter alignment. The SD101BW-7-F maintains identical electrical specifications with a different surface mount package (SOD-123). The BAS86,115 provides higher current capability (200mA) and identical voltage ratings while maintaining the same Mini MELF package form factor as the original part.

Parameter Comparison

Engineering Selection Recommendations

SD101BW-7-F (Diodes Incorporated)

The SD101BW-7-F is the manufacturer-recommended primary substitute for the LLSD101B-7. Both parts are manufactured by Diodes Incorporated and share identical electrical specifications: 50V reverse voltage, 15mA average rectified current, 950mV forward voltage, 1ns reverse recovery time, and 200nA reverse leakage current. The SD101BW-7-F maintains active product status and ROHS3 compliance. The primary difference is packaging: the SD101BW-7-F uses SOD-123 surface mount package instead of Mini MELF. This substitution is suitable for applications where PCB layout accommodates SOD-123 footprint. The SD101BW-7-F offers extended lower operating temperature range (-65°C to 125°C) and REACH unaffected status, providing regulatory advantages over the original part.

BAS86,115 (Nexperia USA Inc.)

The BAS86,115 is an alternative substitute manufactured by Nexperia USA Inc. that maintains the original Mini MELF package form factor (DO-213AC, SOD-80), enabling direct mechanical compatibility with existing PCB designs. The BAS86,115 shares the 50V reverse voltage rating and provides higher current capability at 200mA average rectified current, exceeding the original 15mA specification. Forward voltage is lower at 900mV @ 100mA. Reverse recovery time is 4ns, higher than the original 1ns specification. Reverse leakage current is 5µA @ 40V, higher than the original 200nA specification. The BAS86,115 is active product status with ROHS3 compliance and REACH unaffected status. This substitution is suitable for applications requiring package-compatible replacement where the higher current rating and increased leakage current do not present circuit constraints.

Frequently Asked Questions (FAQ)

Q: Can the SD101BW-7-F directly replace the LLSD101B-7 on existing PCBs?

A: Electrical substitution is direct; the SD101BW-7-F matches all electrical specifications of the LLSD101B-7. However, mechanical substitution requires PCB redesign. The SD101BW-7-F uses SOD-123 package while the LLSD101B-7 uses Mini MELF (DO-213AC). PCB footprints are not compatible without layout modification.

Q: Can the BAS86,115 directly replace the LLSD101B-7 on existing PCBs?

A: The BAS86,115 maintains the same Mini MELF package (DO-213AC, SOD-80) as the LLSD101B-7, enabling direct mechanical compatibility. Electrical parameters differ: the BAS86,115 provides 200mA current capability versus 15mA, 4ns reverse recovery time versus 1ns, and 5µA reverse leakage versus 200nA. These differences are acceptable in applications where the higher current rating and increased leakage do not violate circuit requirements.

Q: What is the primary difference between the two substitute parts?

A: The SD101BW-7-F provides electrical equivalence with package change (SOD-123). The BAS86,115 provides package equivalence with electrical parameter differences (higher current, higher leakage, slower recovery). Selection depends on whether PCB layout flexibility or package compatibility is the priority.

Q: Are both substitute parts compliant with current regulations?

A: Both substitute parts are ROHS3 compliant and carry MSL 1 (Unlimited) moisture sensitivity rating. The SD101BW-7-F and BAS86,115 are both REACH unaffected, providing regulatory advantage over the original LLSD101B-7 which is REACH affected.

Q: What is the operating temperature range difference between substitutes?

A: The SD101BW-7-F operates from -65°C to 125°C, extending the lower temperature limit by 10°C compared to the LLSD101B-7 (-55°C to 125°C). The BAS86,115 specifies 125°C maximum without a defined minimum, requiring verification for applications requiring operation below 0°C.

Q: How do reverse recovery time differences affect circuit performance?

A: The LLSD101B-7 and SD101BW-7-F both specify 1ns reverse recovery time. The BAS86,115 specifies 4ns. In high-frequency switching applications, the longer recovery time of the BAS86,115 may introduce additional switching losses and heat generation. For low-frequency or DC applications, this difference is negligible.

Q: Can the higher current rating of the BAS86,115 cause issues?

A: The BAS86,115 is rated for 200mA average rectified current, exceeding the original 15mA specification. In circuits designed for 15mA operation, the higher current rating does not cause functional issues; the device operates within its safe operating area. However, the higher reverse leakage current (5µA versus 200nA) may affect precision analog circuits requiring minimal leakage.