LLSD103A-13 Equivalent & Substitute Parts

Part Overview

The LLSD103A-13 is a Schottky diode rated for 40 V DC reverse voltage with 350 mA average rectified current, packaged in a Surface Mount Mini MELF (DO-213AA) configuration. This component is designed for fast recovery applications with a reverse recovery time of 10 ns and operates across a junction temperature range of -55°C to 125°C.

The LLSD103A-13 carries an Obsolete product status. Locating equivalent substitute components is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

Substiute Parts

LLSD103A-13

Diodes IncorporatedIn Stock: 1037LLSD103A-13 Datasheet

Current PartRFQ

TMMBAT48FILM

STMicroelectronicsIn Stock: 75370TMMBAT48FILM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the LLSD103A-13 are identified based on electrical and mechanical parameter equivalence within the Schottky diode category. The substitution criteria are:

Primary Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 40 V
• Current - Average Rectified (Io): 350 mA
• Technology: Schottky
• Package / Case: DO-213AA (Mini MELF)
• Mounting Type: Surface Mount
• Reverse Recovery Time (trr): 10 ns

Secondary Compatibility Factors:

• Operating Temperature Range: Minimum -55°C junction temperature
• RoHS3 Compliance: Required
• Moisture Sensitivity Level: 1 (Unlimited)

The TMMBAT48FILM meets all primary matching parameters and maintains compatibility across secondary factors, qualifying it as a direct electrical and mechanical substitute.

Parameter Comparison

Engineering Selection Recommendations

The TMMBAT48FILM is a qualified substitute for the LLSD103A-13 based on the following engineering criteria:

Electrical Equivalence: Both components share identical voltage ratings (40 V DC reverse), current ratings (350 mA average rectified), and reverse recovery time (10 ns). These parameters define the core functional performance in Schottky diode applications.

Mechanical Compatibility: Both components utilize the DO-213AA Mini MELF package in Surface Mount configuration, ensuring PCB layout and assembly process compatibility without design modification.

Compliance Status: The TMMBAT48FILM maintains ROHS3 compliance and MSL 1 rating, matching the regulatory and environmental requirements of the original component.

Supply Availability: The TMMBAT48FILM carries Active product status with substantial inventory availability (75,300 pcs), addressing the supply chain limitation created by the LLSD103A-13 Obsolete status.

Parameter Variations: The TMMBAT48FILM exhibits higher forward voltage drop (750 mV vs. 600 mV @ 200 mA) and higher reverse leakage current (25 µA @ 40 V vs. 5 µA @ 30 V). These differences fall within acceptable tolerances for standard rectification and switching applications. The TMMBAT48FILM provides lower junction capacitance (20 pF vs. 50 pF) and an extended operating temperature range (-65°C to 125°C vs. -55°C to 125°C), both favorable characteristics.

Frequently Asked Questions (FAQ)

Q: Can the TMMBAT48FILM directly replace the LLSD103A-13 without circuit modification?

A: Yes. Both components share identical voltage ratings, current ratings, reverse recovery time, and DO-213AA Mini MELF package configuration. No circuit modification is required for direct substitution in standard applications.

Q: What is the significance of the forward voltage difference (600 mV vs. 750 mV)?

A: The TMMBAT48FILM exhibits 150 mV higher forward voltage drop at 200 mA. In rectification circuits, this results in slightly increased power dissipation. For switching applications, this difference is typically negligible. Circuit thermal analysis should confirm acceptable performance in power-sensitive designs.

Q: Why does the TMMBAT48FILM have higher reverse leakage current?

A: The TMMBAT48FILM reverse leakage is measured at 40 V (full rated voltage) versus the LLSD103A-13 measurement at 30 V. At equivalent voltage levels, leakage differences are minimal. This parameter does not affect substitution suitability for standard applications.

Q: Is the lower capacitance of the TMMBAT48FILM beneficial?

A: Lower junction capacitance (20 pF vs. 50 pF) improves high-frequency switching performance and reduces parasitic effects. This represents an improvement over the original component specification.

Q: Are there packaging differences between the two components?

A: Both components use DO-213AA Mini MELF Surface Mount packages. The TMMBAT48FILM specifies "DO-213AA (Glass)" indicating a glass-encapsulated variant, which is standard for this package type and presents no compatibility issues.

Q: What is the impact of the extended temperature range in the TMMBAT48FILM?

A: The TMMBAT48FILM operates from -65°C to 125°C versus -55°C to 125°C for the LLSD103A-13. The extended lower temperature limit provides additional margin for applications in extreme cold environments. This represents a performance advantage with no negative impact.

Q: Is the TMMBAT48FILM suitable for all applications using the LLSD103A-13?

A: The TMMBAT48FILM is suitable for applications where the LLSD103A-13 was specified, provided circuit design accommodates the stated parameter variations (forward voltage and reverse leakage). Standard rectification, switching, and protection applications present no compatibility concerns.