LLSD103B-13 Equivalent & Substitute Parts

Part Overview

The LLSD103B-13 is a Schottky diode manufactured by Diodes Incorporated, rated for 30 V DC reverse voltage and 350 mA average rectified current in a Surface Mount Mini MELF package. This component is classified as obsolete, necessitating identification of equivalent substitute parts for ongoing design requirements and production continuity. Substitute parts must maintain electrical compatibility within the specified voltage and current parameters while accommodating available packaging and supplier options.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	30 V
Current - Average Rectified (Io)	350 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA
Technology	Schottky
Mounting Type	Surface Mount
Package / Case	DO-213AA (Mini MELF)
Operating Temperature - Junction	-55°C ~ 125°C
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the LLSD103B-13 is determined by the following critical electrical and mechanical parameters:

Voltage Compatibility: All substitute parts must maintain a DC reverse voltage rating of 30 V or greater to ensure safe operation within the original design envelope.

Current Rating: The original part specifies 350 mA average rectified current. Substitute parts rated at 200 mA represent a reduced current capacity and are suitable only for applications where the actual circuit current does not exceed 200 mA. Designs requiring the full 350 mA capability cannot use 200 mA-rated substitutes.

Technology: All substitutes employ Schottky diode technology, maintaining the same rectification characteristics and forward voltage behavior as the original part.

Package Compatibility: The original part uses DO-213AA (Mini MELF) packaging. Substitute parts must use compatible Surface Mount packages (DO-213AA, DO-213AC, MINI-MELF, or SOD-80) to ensure mechanical fit and soldering compatibility.

Temperature Range: Operating temperature specifications must accommodate the circuit's thermal environment. The original part operates from -55°C to 125°C; substitute parts with maximum junction temperatures of 125°C are suitable for applications not requiring the -55°C lower limit.

Compliance: All substitute parts maintain ROHS3 compliance and MSL 1 rating, ensuring regulatory and moisture handling compatibility.

Parameter Comparison

Parameter	LLSD103B-13	BAS85,115	BAS85,135	TMMBAT42FILM	TMMBAT43FILM
Manufacturer	Diodes Incorporated	Nexperia USA Inc.	Nexperia USA Inc.	STMicroelectronics	STMicroelectronics
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	350 mA	200 mA	200 mA	200 mA	200 mA
Voltage - Forward (Vf) (Max) @ If	600 mV @ 200 mA	800 mV @ 100 mA	800 mV @ 100 mA	1 V @ 200 mA	1 V @ 200 mA
Technology	Schottky	Schottky	Schottky	Schottky	Schottky
Current - Reverse Leakage @ Vr	5 µA @ 20 V	2.3 µA @ 25 V	2.3 µA @ 25 V	500 nA @ 25 V	500 nA @ 25 V
Capacitance @ Vr, F	50 pF @ 0 V, 1 MHz	10 pF @ 1 V, 1 MHz	10 pF @ 1 V, 1 MHz	7 pF @ 1 V, 1 MHz	7 pF @ 1 V, 1 MHz
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	DO-213AA	DO-213AC, MINI-MELF, SOD-80	DO-213AC, MINI-MELF, SOD-80	DO-213AA (Glass)	DO-213AA (Glass)
Operating Temperature - Junction	-55°C ~ 125°C	125°C (Max)	125°C (Max)	-65°C ~ 125°C	-65°C ~ 125°C
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Current Capacity Consideration: The LLSD103B-13 is rated for 350 mA average rectified current. All four substitute parts are rated for 200 mA maximum. Selection of any substitute part is limited to applications where the actual circuit current does not exceed 200 mA. Designs requiring the full 350 mA capability of the original part cannot use these substitutes.

Active Product Status: All substitute parts (BAS85,115, BAS85,135, TMMBAT42FILM, TMMBAT43FILM) maintain active product status with established supply chains and ongoing manufacturing support, providing long-term availability compared to the obsolete LLSD103B-13.

Packaging Compatibility: TMMBAT42FILM and TMMBAT43FILM maintain the DO-213AA (Mini MELF) package identical to the original part, ensuring direct mechanical and thermal compatibility. BAS85,115 and BAS85,135 offer DO-213AC and SOD-80 package options in addition to MINI-MELF, providing layout flexibility.

Regulatory Compliance: All substitute parts maintain ROHS3 compliance and MSL 1 rating, meeting the same environmental and handling requirements as the original part.

Temperature Range: TMMBAT42FILM and TMMBAT43FILM extend the lower operating temperature to -65°C, providing enhanced performance in low-temperature environments. BAS85,115 and BAS85,135 specify a maximum junction temperature of 125°C without a defined lower limit, suitable for applications within standard industrial temperature ranges.

Reverse Leakage and Capacitance: TMMBAT42FILM and TMMBAT43FILM exhibit significantly lower reverse leakage (500 nA versus 5 µA) and reduced capacitance (7 pF versus 50 pF), characteristics beneficial for high-frequency and low-leakage applications.

Frequently Asked Questions (FAQ)

Q: Can the LLSD103B-13 be directly replaced with any of the listed substitute parts?

A: Direct replacement is limited by current rating. The LLSD103B-13 is rated for 350 mA, while all substitute parts are rated for 200 mA maximum. Substitution is valid only for applications where the actual circuit current does not exceed 200 mA. Designs requiring 350 mA operation cannot use these substitutes.

Q: Are the substitute parts mechanically compatible with the original LLSD103B-13 footprint?

A: TMMBAT42FILM and TMMBAT43FILM use the DO-213AA (Mini MELF) package, identical to the original part, ensuring direct mechanical compatibility. BAS85,115 and BAS85,135 offer MINI-MELF packaging as an option, also compatible with the original footprint. Verify specific package selection when ordering.

Q: What is the difference between BAS85,115 and BAS85,135?

A: Both parts are electrically identical Schottky diodes rated for 30 V and 200 mA. The primary difference is packaging: BAS85,115 is supplied in Cut Tape (CT) & Digi-Reel format, while BAS85,135 is supplied in Tape & Reel (TR) format. Selection depends on procurement and assembly requirements.

Q: How do TMMBAT42FILM and TMMBAT43FILM differ?

A: TMMBAT42FILM and TMMBAT43FILM are electrically identical Schottky diodes with identical electrical specifications. Both are rated for 30 V and 200 mA with -65°C to 125°C operating temperature range. Selection between these parts is based on availability and supplier preference.

Q: What are the implications of the lower current rating in substitute parts?

A: Substitute parts rated for 200 mA are suitable for applications where the actual circuit current does not exceed this limit. If the original design requires sustained operation at currents above 200 mA, these substitutes will not provide equivalent performance and alternative solutions must be evaluated.

Q: Do the substitute parts maintain the same forward voltage characteristics?

A: Forward voltage specifications differ across substitutes. The original LLSD103B-13 specifies 600 mV at 200 mA. BAS85,115 and BAS85,135 specify 800 mV at 100 mA. TMMBAT42FILM and TMMBAT43FILM specify 1 V at 200 mA. Circuit designs sensitive to forward voltage drop must account for these variations.

Q: Are all substitute parts compliant with current regulatory requirements?

A: All substitute parts maintain ROHS3 compliance and MSL 1 rating, meeting current regulatory and environmental handling standards equivalent to the original part.

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