BAS40 Equivalent & Substitute Parts

Part Overview

The BAS40 is an active Schottky diode manufactured by Infineon Technologies, designed for surface mount applications in the SOT-23-3 package. This component operates at a maximum reverse voltage of 40 V with an average rectified current rating of 200 mA. The BAS40 is utilized in applications requiring small-signal rectification, switching, and protection circuits where low forward voltage drop and fast switching characteristics are essential. Equivalent and substitute parts are identified to provide design flexibility, support supply chain alternatives, and accommodate specific application requirements while maintaining electrical and mechanical compatibility.

Substiute Parts

BAS40

Infineon TechnologiesIn Stock: 65286BAS40 Datasheet

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BAT54FILM

STMicroelectronicsIn Stock: 47310BAT54FILM Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BAS40 are identified based on the following critical parameters that determine functional compatibility:

Matching Criteria:

• Technology classification: Schottky diode
• Package compatibility: SOT-23-3 (TO-236-3, SC-59)
• Mounting type: Surface mount
• Reverse voltage rating: 40 V maximum
• Reverse recovery time: 5 ns
• Operating temperature range: Minimum -40°C to maximum 150°C

Allowable Variations:

• Current - Average Rectified (Io): Equal to or greater than 200 mA
• Voltage - Forward (Vf): Equal to or less than 1 V at specified test current
• Current - Reverse Leakage: Equal to or less than 200 nA at 30 V
• Capacitance: Variations permitted within typical application tolerances

The BAT54FILM from STMicroelectronics meets all matching criteria and allowable variation parameters, qualifying it as a direct substitute for the BAS40 in applications requiring Schottky rectification in the SOT-23-3 package.

Parameter Comparison

Engineering Selection Recommendations

Both the BAS40 and BAT54FILM are active products with established supply availability. The BAT54FILM provides a higher current rating (300 mA versus 200 mA), making it suitable for applications requiring additional current margin. The BAT54FILM demonstrates RoHS3 compliance and REACH unaffected status, supporting regulatory requirements in restricted substance applications.

The BAS40 supports an extended lower operating temperature limit of -50°C compared to the BAT54FILM at -40°C, making the BAS40 the appropriate selection for applications requiring operation below -40°C. Both devices maintain identical reverse voltage ratings and reverse recovery time specifications, ensuring equivalent switching performance in rectification and protection circuits.

Selection between these parts should be based on specific application requirements regarding current capacity, temperature range, and regulatory compliance status. Both components are suitable for direct substitution within their respective parameter boundaries.

Frequently Asked Questions (FAQ)

Q: Can the BAT54FILM replace the BAS40 in all applications?

A: The BAT54FILM is electrically compatible with the BAS40 for applications operating within the temperature range of -40°C to 150°C. Applications requiring operation below -40°C must use the BAS40 due to its extended lower temperature rating of -50°C.

Q: What are the key differences between these two parts?

A: The primary differences are current rating (BAT54FILM: 300 mA versus BAS40: 200 mA), reverse leakage current (BAT54FILM: 1 µA versus BAS40: 200 nA at 30 V), capacitance (BAT54FILM: 10 pF versus BAS40: 5 pF), and minimum operating temperature (BAT54FILM: -40°C versus BAS40: -50°C). Both maintain identical reverse voltage and recovery time specifications.

Q: Are the packages physically identical?

A: Yes, both the BAS40 and BAT54FILM use the SOT-23-3 package (also designated TO-236-3 or SC-59), ensuring identical PCB footprint and mounting compatibility.

Q: Does the higher current rating of the BAT54FILM affect circuit performance?

A: The higher current rating of the BAT54FILM does not negatively affect circuit performance. It provides additional design margin and allows operation at higher current levels without exceeding device ratings. For applications designed for 200 mA operation, both parts perform identically.

Q: What is the significance of reverse leakage current differences?

A: The BAS40 exhibits lower reverse leakage current (200 nA) compared to the BAT54FILM (1 µA) at 30 V. For applications sensitive to leakage current, such as precision analog circuits or high-impedance switching applications, the BAS40 is the preferred selection.

Q: Are both parts suitable for high-frequency switching applications?

A: Yes, both parts are suitable for high-frequency switching applications. Both maintain a reverse recovery time of 5 ns, supporting fast switching operation in rectification, protection, and signal conditioning circuits.