LLSD103C-7 Equivalent & Substitute Parts

Part Overview

The LLSD103C-7 is a Schottky rectifier diode manufactured by Diodes Incorporated, rated for 20 V DC reverse voltage with 350 mA average rectified current. The device is packaged in a DO-213AC Mini MELF surface mount configuration and is designed for fast recovery applications with a reverse recovery time of 10 ns.

The LLSD103C-7 carries an Obsolete product status. Identification of equivalent and substitute parts is necessary to maintain design continuity and ensure component availability for new production runs, repairs, and ongoing system support.

Substiute Parts

LLSD103C-7

Diodes IncorporatedIn Stock: 5473LLSD103C-7 Datasheet

Current PartRFQ

SD103CW-13-F

Diodes IncorporatedIn Stock: 4200SD103CW-13-F Datasheet

MFR RecommendedRFQ

SD103CW-7-F

Diodes IncorporatedIn Stock: 17448SD103CW-7-F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LLSD103C-7 is determined by electrical parameter equivalence and mechanical compatibility. The following criteria establish valid substitution:

Electrical Parameters (Must Match):

• Voltage - DC Reverse (Vr) (Max): 20 V
• Current - Average Rectified (Io): 350 mA
• Voltage - Forward (Vf) (Max) @ If: 600 mV @ 200 mA
• Reverse Recovery Time (trr): 10 ns
• Current - Reverse Leakage @ Vr: 5 µA @ 10 V
• Technology: Schottky

Mechanical Parameters (Must Match):

• Mounting Type: Surface Mount
• Manufacturer: Diodes Incorporated

Acceptable Variations:

• Package / Case: Different surface mount packages (DO-213AC Mini MELF to SOD-123) are acceptable provided the footprint is compatible with the application circuit board design
• Capacitance @ Vr, F: Variation from 50 pF to 28 pF is acceptable as this parameter does not affect primary rectification function
• Operating Temperature - Junction: Extended range (-65°C to 125°C versus -55°C to 125°C) is acceptable as a substitute

The substitute parts SD103CW-13-F and SD103CW-7-F meet all electrical parameter requirements and are manufactured by the same supplier, ensuring functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

SD103CW-13-F (Tape & Reel Packaging)

The SD103CW-13-F is an active product with full electrical equivalence to the LLSD103C-7. This part is suitable for applications requiring tape and reel packaging for automated assembly processes. The extended operating temperature range (-65°C to 125°C) provides additional thermal margin compared to the original part. ROHS3 compliance and unlimited moisture sensitivity rating ensure regulatory and environmental compatibility. This substitute is appropriate for high-volume production environments.

SD103CW-7-F (Cut Tape & Digi-Reel® Packaging)

The SD103CW-7-F is an active product with full electrical equivalence to the LLSD103C-7. This part is available in Cut Tape and Digi-Reel® packaging, suitable for both manual and semi-automated assembly processes. Inventory availability (17,400 pieces) exceeds that of the SD103CW-13-F variant. The extended operating temperature range and ROHS3 compliance match the SD103CW-13-F. This substitute is appropriate for mixed-volume production and prototyping applications.

Package Compatibility Consideration

Both substitute parts use SOD-123 packaging, which differs from the original DO-213AC Mini MELF package. Circuit board layout and footprint design must accommodate the SOD-123 package geometry. Electrical performance is equivalent; mechanical integration requires design verification.

Frequently Asked Questions (FAQ)

Q: Can SD103CW-13-F and SD103CW-7-F be used interchangeably with LLSD103C-7?

A: Yes, both parts are electrically equivalent to the LLSD103C-7. All critical electrical parameters—reverse voltage, rectified current, forward voltage, and reverse recovery time—are identical. The primary difference is packaging format (tape and reel versus cut tape) and the physical package type (SOD-123 versus Mini MELF). Circuit board footprint compatibility must be confirmed before substitution.

Q: What is the difference between SD103CW-13-F and SD103CW-7-F?

A: Both parts are electrically identical. The difference is packaging: SD103CW-13-F is supplied in Tape & Reel format, while SD103CW-7-F is supplied in Cut Tape and Digi-Reel® format. SD103CW-7-F has higher inventory availability. Selection depends on assembly process requirements and volume needs.

Q: Why does the capacitance differ between LLSD103C-7 and the substitute parts?

A: The LLSD103C-7 has 50 pF capacitance while SD103CW-13-F and SD103CW-7-F have 28 pF capacitance, both measured at 0V and 1 MHz. This difference is a result of different package geometries (Mini MELF versus SOD-123). The lower capacitance of the SOD-123 package does not affect rectification performance and is acceptable for substitution.

Q: Are the substitute parts RoHS compliant?

A: Yes, both SD103CW-13-F and SD103CW-7-F are ROHS3 compliant, matching the compliance status of the original LLSD103C-7.

Q: What is the operating temperature range for the substitute parts?

A: Both substitute parts operate from -65°C to 125°C junction temperature, which is a wider range than the original LLSD103C-7 (-55°C to 125°C). This extended range provides additional thermal margin and is acceptable for substitution.

Q: Is circuit board redesign required to use the substitute parts?

A: The substitute parts use SOD-123 packaging instead of the original Mini MELF package. The footprint dimensions differ, so circuit board layout must be updated to accommodate the new package geometry. Electrical connections and functionality remain equivalent.

Q: What is the moisture sensitivity level for these parts?

A: All three parts—LLSD103C-7, SD103CW-13-F, and SD103CW-7-F—have Moisture Sensitivity Level (MSL) 1, which indicates unlimited shelf life and no special moisture control requirements during storage or handling.