LL43-GS18 Equivalent & Substitute Parts

Part Overview

The LL43-GS18 is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 30 V DC reverse voltage and 200 mA average rectified current in a Surface Mount SOD-80 MiniMELF package. This component is classified as Active product status and carries AEC-Q101 automotive qualification. Substitute parts are identified when equivalent electrical performance, mechanical compatibility, and compliance certifications align with the original specification, enabling component sourcing flexibility across multiple manufacturers while maintaining circuit functionality.

Substiute Parts

LL43-GS18

Vishay General Semiconductor - Diodes DivisionIn Stock: 9815LL43-GS18 Datasheet

Current PartRFQ

TMMBAT42FILM

STMicroelectronicsIn Stock: 42789TMMBAT42FILM Datasheet

UpgradeRFQ

TMMBAT43FILM

STMicroelectronicsIn Stock: 23622TMMBAT43FILM Datasheet

UpgradeRFQ

BAS85,115

Nexperia USA Inc.In Stock: 235206BAS85,115 Datasheet

MFR RecommendedRFQ

BAS85,135

Nexperia USA Inc.In Stock: 4485BAS85,135 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LL43-GS18 is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Voltage - DC Reverse (Vr) (Max): 30 V
• Current - Average Rectified (Io): 200 mA
• Technology: Schottky
• Speed Classification: Small Signal ≤ 200mA (Io), Any Speed
• Mounting Type: Surface Mount
• Package / Case: DO-213AC, MINI-MELF, SOD-80 or equivalent Mini MELF form factor
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts meet these core electrical and mechanical requirements. Variations in forward voltage (Vf), reverse leakage current, and capacitance are within acceptable tolerances for Schottky diode applications and do not preclude substitution when the critical parameters align.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts—TMMBAT42FILM, TMMBAT43FILM, BAS85,115, and BAS85,135—are Active product status components with ROHS3 compliance and MSL 1 rating, matching the environmental and regulatory requirements of the LL43-GS18.

Packaging Considerations:

The LL43-GS18 is supplied in Cut Tape (CT) packaging. TMMBAT42FILM and TMMBAT43FILM are available in both Cut Tape (CT) and Digi-Reel® formats. BAS85,115 is available in Cut Tape (CT) and Digi-Reel® formats. BAS85,135 is supplied in Tape & Reel (TR) format. Packaging format selection depends on procurement and assembly requirements.

Electrical Performance:

All substitute parts maintain the 30 V reverse voltage rating and 200 mA current rating. Forward voltage characteristics vary slightly: the LL43-GS18 specifies 450 mV @ 15 mA, while STMicroelectronics parts specify 1 V @ 200 mA, and Nexperia parts specify 800 mV @ 100 mA. These variations are within normal Schottky diode tolerances and do not affect circuit substitution validity.

Inventory Availability:

BAS85,115 (Nexperia) offers the highest inventory level at 235,100 pieces. TMMBAT42FILM (STMicroelectronics) provides 42,700 pieces. TMMBAT43FILM (STMicroelectronics) provides 23,600 pieces. BAS85,135 (Nexperia) provides 4,390 pieces.

Frequently Asked Questions (FAQ)

Q: Can TMMBAT42FILM or TMMBAT43FILM replace LL43-GS18 in automotive applications?

A: Both TMMBAT42FILM and TMMBAT43FILM are Active status Schottky diodes with 30 V reverse voltage and 200 mA current ratings, matching the LL43-GS18 electrical specification. However, the LL43-GS18 carries AEC-Q101 automotive qualification, while the STMicroelectronics parts do not list this certification in the provided data. Automotive application suitability depends on design requirements for AEC-Q101 compliance.

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

A: Both parts are Nexperia BAS85 base product numbers with identical electrical specifications: 30 V reverse voltage, 200 mA current, 800 mV forward voltage @ 100 mA, and Mini MELF packaging. The primary difference is packaging format: BAS85,115 is supplied in Cut Tape (CT) and Digi-Reel® formats, while BAS85,135 is supplied in Tape & Reel (TR) format.

Q: Are the Mini MELF packages (DO-213AA) from STMicroelectronics mechanically compatible with the SOD-80 MiniMELF package (DO-213AC) of the LL43-GS18?

A: Both DO-213AA and DO-213AC are Mini MELF form factors used for surface mount diodes. Mechanical compatibility for PCB assembly depends on footprint design. Standard Mini MELF footprints accommodate both package variants. Verification with PCB layout documentation is necessary to confirm footprint compatibility for specific applications.

Q: What is the operating temperature range difference between LL43-GS18 and the substitute parts?

A: The LL43-GS18 specifies a maximum junction temperature of 125°C. TMMBAT42FILM and TMMBAT43FILM specify an operating temperature range of −65°C to 125°C. BAS85,115 and BAS85,135 specify a maximum junction temperature of 125°C. The STMicroelectronics parts provide extended low-temperature operation capability.

Q: Can I use BAS85,115 or BAS85,135 in place of LL43-GS18 without circuit redesign?

A: BAS85,115 and BAS85,135 meet the core electrical parameters: 30 V reverse voltage, 200 mA current, Schottky technology, and Mini MELF packaging. Both are ROHS3 compliant with MSL 1 rating. Direct substitution is supported from an electrical and compliance standpoint. Package footprint compatibility with PCB design must be confirmed.

Q: Why does the LL43-GS18 have a lower forward voltage specification (450 mV @ 15 mA) compared to substitute parts?

A: Forward voltage specifications are measured at different current levels. The LL43-GS18 is specified at 15 mA, while STMicroelectronics parts are specified at 200 mA and Nexperia parts at 100 mA. Schottky diode forward voltage increases with current. Specifications at different measurement points reflect manufacturer characterization practices and do not indicate substitution incompatibility.

Q: Is reverse leakage current a concern when substituting LL43-GS18 with BAS85 variants?

A: The LL43-GS18 specifies 500 nA reverse leakage @ 25 V. BAS85,115 and BAS85,135 specify 2.3 µA reverse leakage @ 25 V. This represents a higher leakage current in the Nexperia parts. For applications sensitive to leakage current, this difference must be evaluated against circuit requirements. STMicroelectronics parts (TMMBAT42FILM, TMMBAT43FILM) specify 500 nA leakage, matching the LL43-GS18.