BAS40W,115 Equivalent & Substitute Parts

Part Overview

The BAS40W,115 is a Schottky diode manufactured by Nexperia USA Inc., rated for 40 V DC reverse voltage and 120 mA average rectified current in a surface mount SOT-323 package. This component is classified as Active product status and carries AEC-Q100 automotive qualification. Equivalent and substitute parts are identified based on matching or exceeding the electrical specifications and package compatibility requirements for applications requiring Schottky rectification in compact form factors.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	120	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 40 mA	V @ mA
Current - Reverse Leakage @ Vr	10	µA @ 40 V
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Operating Temperature - Junction (Max)	150	°C
Package / Case	SC-70, SOT-323	—
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAS40W,115 is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 40 V or higher to ensure safe operation within the application's voltage envelope.

Current Rating: Substitute parts must support a minimum average rectified current of 120 mA. Parts with higher current ratings (200 mA, 300 mA) are acceptable as they provide additional design margin.

Package Compatibility: The primary package is SOT-323 (SC-70). Substitute parts in alternative packages such as SOT-23-3 (SC-59, TO-236-3) are listed separately due to different PCB footprints and assembly requirements.

Technology: All listed substitutes employ Schottky diode technology, maintaining consistent forward voltage characteristics and switching speed performance.

Compliance & Qualification: RoHS3 compliance and MSL rating are consistent across all parts. Automotive-grade parts (AEC-Q100, AEC-Q101) are identified where applicable.

Substitutes are grouped into two categories:

Direct SOT-323 Package Substitutes: Parts maintaining the same physical package footprint with equivalent or superior electrical performance.
Alternative Package Substitutes: Parts with different package geometries (SOT-23-3) that require PCB redesign but offer equivalent electrical functionality.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	Ir @ Vr [µA]	Package	Temp Range [°C]	Automotive Grade
BAS40W,115	Nexperia USA Inc.	40	120	1 @ 40	10 @ 40V	SOT-323	–55 to 150	AEC-Q100
BAS40WT-TP	Micro Commercial Co	40	200	1 @ 40	1 @ 30V	SOT-323	–55 to 150	No
BAS40W-7-F	Diodes Incorporated	40	200	1 @ 40	0.2 @ 30V	SOT-323	–55 to 125	No
BAS40W-AU_R1_000A1	Panjit International Inc.	40	200	1 @ 40	1 @ 40V	SOT-323	–55 to 150	AEC-Q101
BAS40E6327HTSA1	Infineon Technologies	40	120	1 @ 40	1 @ 30V	SOT-23-3	–55 to 150	No
BAS40E6433HTMA1	Infineon Technologies	40	120	1 @ 40	1 @ 30V	SOT-23-3	–55 to 150	No
BAS4005E6327HTSA1	Infineon Technologies	40	120	1 @ 40	1 @ 30V	SOT-23-3	–55 to 150	No
BAS4005E6433HTMA1	Infineon Technologies	40	120	1 @ 40	1 @ 30V	SOT-23-3	–55 to 150	No
BAT54FILM	STMicroelectronics	40	300	0.9 @ 100	1 @ 30V	SOT-23-3	–40 to 150	No
SDMG0340L-7-F	Diodes Incorporated	40	30	0.37 @ 1	1 @ 10V	SOT-323	–40 to 125	No

Engineering Selection Recommendations

For Direct Package Replacement (SOT-323):

The BAS40WT-TP (Micro Commercial Co) and BAS40W-7-F (Diodes Incorporated) are direct SOT-323 package substitutes with 200 mA current ratings, providing 67% additional current capacity over the BAS40W,115. Both maintain 40 V reverse voltage rating and 1 V forward voltage specification. The BAS40W-7-F exhibits lower reverse leakage (0.2 µA @ 30 V) compared to the original part. The BAS40W-AU_R1_000A1 (Panjit International Inc.) offers automotive AEC-Q101 qualification with 200 mA rating and maintains the full –55°C to 150°C temperature range.

For Automotive Applications:

The BAS40W-AU_R1_000A1 is the preferred substitute when AEC-Q101 automotive qualification is required. It maintains SOT-323 package compatibility and provides enhanced current capacity (200 mA) with automotive-grade reliability.

For Alternative Package Implementations (SOT-23-3):

The Infineon BAS40E6327HTSA1, BAS40E6433HTMA1, BAS4005E6327HTSA1, and BAS4005E6433HTMA1 are electrically equivalent to the BAS40W,115 with 120 mA current ratings but employ SOT-23-3 packaging. These require PCB redesign due to different footprint geometry. The BAS4005 series represents diode array configurations (1 Pair Common Cathode), which differ functionally from single-diode implementations.

For Higher Current Applications (SOT-23-3):

The BAT54FILM (STMicroelectronics) provides 300 mA current capacity in SOT-23-3 package with 40 V rating. Forward voltage is specified at 0.9 V @ 100 mA, representing a lower forward drop than the BAS40W,115 at higher currents.

Not Recommended for Direct Substitution:

The SDMG0340L-7-F (Diodes Incorporated) is rated for only 30 mA average rectified current, which is insufficient for applications requiring the full 120 mA capacity of the BAS40W,115.

Frequently Asked Questions (FAQ)

Q: Can the BAS40WT-TP replace the BAS40W,115 without circuit modification?

A: Yes. The BAS40WT-TP maintains identical SOT-323 package geometry, 40 V reverse voltage rating, and 1 V forward voltage specification. The 200 mA current rating exceeds the 120 mA requirement, providing additional design margin. No circuit modification is required.

Q: What is the difference between SOT-323 and SOT-23-3 packages?

A: SOT-323 (SC-70) and SOT-23-3 (SC-59, TO-236-3) are distinct surface mount packages with different physical dimensions and PCB footprints. Parts in SOT-23-3 package require PCB redesign and cannot be directly substituted on existing SOT-323 layouts without rework.

Q: Are the Infineon BAS4005 series parts direct equivalents?

A: The BAS4005 series parts are diode arrays with 1 Pair Common Cathode configuration, differing functionally from the single-diode BAS40W,115. While electrical parameters match (40 V, 120 mA per diode), the internal configuration and pin arrangement differ. These are not direct pin-for-pin substitutes.

Q: Why is the SDMG0340L-7-F listed if it has only 30 mA rating?

A: The SDMG0340L-7-F is listed as a substitute from the original BAS40W,115 manufacturer data but is not recommended for applications requiring the full 120 mA capacity. It is suitable only for applications with reduced current requirements.

Q: What is the significance of AEC-Q100 and AEC-Q101 qualifications?

A: AEC-Q100 and AEC-Q101 are automotive reliability qualifications. The original BAS40W,115 carries AEC-Q100 qualification. The BAS40W-AU_R1_000A1 carries AEC-Q101 qualification. Both certifications indicate automotive-grade reliability; selection depends on specific application requirements and qualification documentation.

Q: Can the BAT54FILM be used in place of the BAS40W,115?

A: The BAT54FILM provides 300 mA current capacity and 40 V reverse voltage, exceeding the BAS40W,115 specifications. However, it uses SOT-23-3 package, requiring PCB redesign. Forward voltage is specified at 0.9 V @ 100 mA rather than 1 V @ 40 mA, representing different operating conditions. Substitution requires circuit validation.

Q: What does MSL 1 (Unlimited) mean?

A: Moisture Sensitivity Level 1 (Unlimited) indicates the component has no moisture sensitivity restrictions. These parts can be stored indefinitely without desiccant packaging and do not require special handling procedures related to moisture exposure.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All listed substitute parts carry RoHS3 compliance status, consistent with the original BAS40W,115. All parts are also REACH Unaffected and classified under ECCN EAR99.

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