BAS40 Equivalent & Substitute Parts

Part Overview

The BAS40 is a Schottky diode manufactured by Taiwan Semiconductor Corporation, designed for surface mount applications in the SOT-23 package. This component operates at a maximum reverse voltage of 40 V with an average rectified current of 200 mA, making it suitable for small-signal switching and rectification circuits. The part is currently in active production status with RoHS3 compliance and REACH unaffected classification. Equivalent and substitute parts are identified to provide design flexibility, accommodate supply chain variations, and support applications requiring different current ratings or thermal specifications within the same voltage class and package footprint.

Substiute Parts

BAS40

Taiwan Semiconductor CorporationIn Stock: 65302BAS40 Datasheet

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BAT750TA

Diodes IncorporatedIn Stock: 1982BAT750TA Datasheet

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CMPSH05-4 TR PBFREE

Central Semiconductor CorpIn Stock: 22827CMPSH05-4 TR PBFREE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the BAS40 are qualified based on the following criteria:

Mandatory Compatibility Parameters:

• Voltage - DC Reverse (Vr) (Max): 40 V (exact match required)
• Package / Case: TO-236-3, SC-59, SOT-23-3 (identical footprint)
• Technology: Schottky (same diode type)
• Mounting Type: Surface Mount (same assembly method)

Allowable Variation Parameters:

• Current - Average Rectified (Io): Substitute parts must equal or exceed 200 mA
• Voltage - Forward (Vf): Substitute parts must not exceed the original specification at equivalent current levels
• Reverse Recovery Time (trr): Substitute parts must not exceed 5 ns
• Operating Temperature - Junction: Substitute parts must support the original range or extend it
• RoHS and REACH compliance: Substitute parts must maintain or exceed compliance status

The identified substitute parts BAT750TA and CMPSH05-4 TR PBFREE meet all mandatory compatibility requirements and provide enhanced current ratings (750 mA and 500 mA respectively) while maintaining the 40 V reverse voltage specification and SOT-23 package footprint.

Parameter Comparison

Engineering Selection Recommendations

BAS40 (Taiwan Semiconductor Corporation) Select this part for applications requiring the lowest reverse leakage current (200 nA @ 30 V) and minimal junction capacitance (5 pF @ 1 V, 1 MHz). This part is optimal for precision switching circuits and high-impedance applications where leakage minimization is critical. The part maintains full temperature range operation from -65°C to 125°C and is ROHS3 compliant.

BAT750TA (Diodes Incorporated) Select this part for applications requiring higher current capacity (750 mA) within the same 40 V reverse voltage specification. The BAT750TA provides superior current handling with lower forward voltage drop (490 mV @ 750 mA) compared to the BAS40. This part is ROHS3 compliant and includes MSL 1 moisture sensitivity rating. Note that the maximum operating temperature is specified as 125°C without a minimum temperature specification provided.

CMPSH05-4 TR PBFREE (Central Semiconductor Corp) Select this part for applications requiring moderate current capacity (500 mA) with extended operating temperature range (-65°C to 150°C). The CMPSH05-4 TR PBFREE offers the widest temperature specification and is ROHS3 compliant with MSL 1 rating. This part is suitable for applications requiring thermal margin beyond standard industrial specifications.

All three parts maintain identical 40 V reverse voltage ratings, SOT-23 package compatibility, and Schottky technology classification. Selection should be based on specific application requirements for current capacity, leakage characteristics, and operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can BAT750TA be used as a direct replacement for BAS40? A: BAT750TA is mechanically and electrically compatible with BAS40 in terms of reverse voltage (40 V) and package footprint (SOT-23). However, BAT750TA has a higher current rating (750 mA vs. 200 mA) and higher reverse leakage current (100 µA @ 30 V vs. 200 nA @ 30 V). Direct substitution is permissible only if the application circuit can tolerate the increased leakage current and does not require the lower leakage characteristics of the BAS40.

Q: What is the difference between CMPSH05-4 TR PBFREE and BAS40 in terms of speed? A: Both parts specify a reverse recovery time (trr) of 5 ns, indicating equivalent switching speed performance. The CMPSH05-4 TR PBFREE is classified as Fast Recovery (≤ 500 ns, > 200 mA), while the BAS40 is classified as Small Signal (≤ 200 mA). Both classifications are compatible for the intended application range.

Q: Are all three parts RoHS3 compliant? A: Yes, BAS40, BAT750TA, and CMPSH05-4 TR PBFREE are all ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Which substitute part has the lowest forward voltage drop? A: CMPSH05-4 TR PBFREE exhibits the lowest forward voltage drop at 470 mV @ 500 mA, followed by BAT750TA at 490 mV @ 750 mA. The BAS40 forward voltage is specified at 1 V @ 40 mA, which is not directly comparable due to different measurement currents.

Q: Can I use CMPSH05-4 TR PBFREE in a circuit designed for BAS40 if the circuit operates at temperatures above 125°C? A: Yes, CMPSH05-4 TR PBFREE supports operating temperatures up to 150°C, providing 25°C additional thermal margin compared to BAS40. This part is suitable for high-temperature applications within its specified range.

Q: What is the packaging difference between these parts? A: All three parts use identical SOT-23 package footprints (TO-236-3, SC-59, SOT-23-3). The primary packaging difference is that BAT750TA and CMPSH05-4 TR PBFREE are supplied in Tape & Reel (TR) format, while BAS40 packaging format is not specified in the provided data.

Q: Which part should I select for minimum circuit board space? A: All three parts use the same SOT-23 package, resulting in identical board space requirements. Selection should be based on electrical performance requirements rather than physical size.