Equivalent & Substitute Parts for BAS 40 B5003 Schottky Diode

Part Overview

The BAS 40 B5003 is a 40V, 120mA Schottky diode manufactured by Infineon Technologies in SOT-23-3 surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The BAS 40 series serves as the base product number for multiple equivalent variants across different manufacturers, all meeting the same core electrical specifications for low-voltage rectification and switching applications.

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
Reverse Recovery Time (trr)	100	ps
Current - Reverse Leakage @ Vr	1	µA @ 30 V
Capacitance @ Vr, F	5	pF @ 0V, 1MHz
Technology	Schottky	—
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 150	°C
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAS 40 B5003 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 40 V (exact match required)
Current - Average Rectified (Io): 120 mA minimum (equal or higher acceptable)
Voltage - Forward (Vf) (Max) @ If: 1 V @ 40 mA (exact match required)
Technology: Schottky (exact match required)
Package / Case: TO-236-3, SC-59, SOT-23-3 (exact match required)
Mounting Type: Surface Mount (exact match required)

Substitution Categories:

Category 1: Parametric Equivalents (Infineon Technologies) Parts BAS40E6327HTSA1 and BAS40E6433HTMA1 are parametric equivalents with identical electrical specifications to the main part. These differ only in product status (Active vs. Obsolete) and packaging format (Tape & Reel). Both maintain 120 mA current rating and all electrical parameters.

Category 2: Direct Manufacturer Equivalents (Nexperia USA Inc.) Parts BAS40,215 and BAS40,235 are direct equivalents from Nexperia USA Inc. with identical core specifications. These parts include automotive-grade qualification (AEC-Q100) and differ in reverse leakage specification (10 µA @ 40 V vs. 1 µA @ 30 V for the main part) and maximum junction temperature rating (150°C Max vs. -55 to 150°C range).

Category 3: Manufacturer Recommended Upgrades (Higher Current Rating) Parts BAS40-7-F (Diodes Incorporated) and BAS40-TP (Micro Commercial Co) are manufacturer-recommended alternatives with 200 mA current rating, exceeding the 120 mA specification of the main part. These maintain 40 V reverse voltage and identical forward voltage characteristics. Reverse recovery time is specified as 5 ns (vs. 100 ps for main part).

Category 4: Package Variant (SOT-323) Part BAS40W,115 (Nexperia USA Inc.) maintains identical electrical specifications but uses SOT-323 package instead of SOT-23-3. This represents a smaller footprint alternative with automotive qualification.

Category 5: Higher Current Alternatives Parts BAT54FILM (STMicroelectronics, 300 mA) and BAT720,215 / BAT720,235 (Nexperia USA Inc., 500 mA) are higher-current Schottky diodes at 40 V. These are suitable only when circuit design permits higher current capacity and can accommodate different electrical characteristics (forward voltage, reverse leakage, capacitance).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	trr [ps/ns]	Ir @ Vr [µA/nA]	Package	Product Status	Automotive Grade
BAS 40 B5003	Infineon Technologies	40	120	1 @ 40	100 ps	1 µA @ 30V	SOT-23-3	Obsolete	—
BAS40E6327HTSA1	Infineon Technologies	40	120	1 @ 40	100 ps	1 µA @ 30V	SOT-23-3	Active	—
BAS40E6433HTMA1	Infineon Technologies	40	120	1 @ 40	100 ps	1 µA @ 30V	SOT-23-3	Active	—
BAS40,215	Nexperia USA Inc.	40	120	1 @ 40	—	10 µA @ 40V	SOT-23-3	Active	AEC-Q100
BAS40,235	Nexperia USA Inc.	40	120	1 @ 40	—	10 µA @ 40V	SOT-23-3	Active	AEC-Q100
BAS40-7-F	Diodes Incorporated	40	200	1 @ 40	5 ns	200 nA @ 30V	SOT-23-3	Active	—
BAS40-TP	Micro Commercial Co	40	200	1 @ 40	5 ns	200 nA @ 30V	SOT-23-3	Active	—
BAS40W,115	Nexperia USA Inc.	40	120	1 @ 40	—	10 µA @ 40V	SOT-323	Active	AEC-Q100
BAT54FILM	STMicroelectronics	40	300	0.9 @ 100	5 ns	1 µA @ 30V	SOT-23-3	Active	—
BAT720,215	Nexperia USA Inc.	40	500	0.55 @ 500	5 ns	100 µA @ 35V	SOT-23-3	Active	—
BAT720,235	Nexperia USA Inc.	40	500	0.55 @ 500	5 ns	100 µA @ 35V	SOT-23-3	Active	—

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select BAS40E6327HTSA1 or BAS40E6433HTMA1 from Infineon Technologies. Both parts maintain exact electrical and mechanical compatibility with the obsolete BAS 40 B5003. These are active products with unlimited moisture sensitivity level and ROHS3 compliance.

For Active Production with Automotive Qualification: Select BAS40,215 or BAS40,235 from Nexperia USA Inc. Both parts are AEC-Q100 qualified and maintain the 40 V / 120 mA specification. The higher reverse leakage specification (10 µA @ 40 V) is acceptable for most applications. These parts offer the highest inventory availability (6,100 and 10,552 units respectively).

For Compact Package Requirement: Select BAS40W,115 from Nexperia USA Inc. This part provides SOT-323 package with identical electrical specifications and AEC-Q100 automotive qualification. Use only when PCB layout constraints require smaller footprint.

For Higher Current Margin: Select BAS40-7-F from Diodes Incorporated or BAS40-TP from Micro Commercial Co. Both provide 200 mA current rating with identical 40 V reverse voltage and forward voltage characteristics. These are suitable when circuit design permits higher current capacity and offers improved reliability margin.

For Maximum Current Capacity: Select BAT54FILM (300 mA) or BAT720,215 / BAT720,235 (500 mA) only when application requires higher current handling. These parts introduce different electrical characteristics and should be selected only after circuit analysis confirms compatibility.

Frequently Asked Questions (FAQ)

Q: Can BAS40E6327HTSA1 directly replace BAS 40 B5003 without circuit modification?

A: Yes. BAS40E6327HTSA1 is a parametric equivalent with identical electrical specifications: 40 V reverse voltage, 120 mA current rating, 1 V forward voltage @ 40 mA, and SOT-23-3 package. The only difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel). No circuit modification is required.

Q: What is the difference between BAS40,215 and BAS40,235?

A: Both parts are from Nexperia USA Inc. with identical electrical specifications and AEC-Q100 automotive qualification. The primary difference is packaging format: BAS40,215 is supplied in Cut Tape format, while BAS40,235 is supplied in Tape & Reel format. Electrical performance is identical.

Q: Can I use BAS40-7-F as a drop-in replacement?

A: BAS40-7-F is mechanically compatible (SOT-23-3 package) and electrically compatible for most applications. However, it has a higher current rating (200 mA vs. 120 mA) and different reverse recovery time (5 ns vs. 100 ps). It is suitable as a replacement when circuit design permits higher current capacity. Verify that the higher current rating does not introduce unintended circuit behavior.

Q: What is the advantage of BAS40W,115 over standard BAS40 variants?

A: BAS40W,115 uses SOT-323 package instead of SOT-23-3, providing a smaller footprint for space-constrained PCB layouts. Electrical specifications remain identical (40 V, 120 mA). This part includes AEC-Q100 automotive qualification. Select only when PCB layout requires compact package size.

Q: Are BAT54FILM and BAT720 series suitable replacements?

A: BAT54FILM and BAT720 series are not direct replacements. These parts have higher current ratings (300 mA and 500 mA respectively) and different electrical characteristics including forward voltage and reverse leakage. Use these parts only when circuit analysis confirms that higher current capacity is required and the different electrical parameters are acceptable for the application.

Q: Which substitute part has the best availability?

A: BAS40,235 from Nexperia USA Inc. has the highest inventory availability at 10,552 units in stock. BAS40-7-F from Diodes Incorporated has 35,400 units available. Both are active products suitable for new designs.

Q: Is RoHS3 compliance important for my selection?

A: All active substitute parts listed are RoHS3 compliant. The obsolete BAS 40 B5003 does not specify RoHS status. If RoHS3 compliance is a design requirement, select from the active product list: BAS40E6327HTSA1, BAS40E6433HTMA1, BAS40,215, BAS40,235, BAS40-7-F, BAS40-TP, BAS40W,115, BAT54FILM, BAT720,215, or BAT720,235.

Q: What is the difference between Infineon and Nexperia variants?

A: Infineon Technologies offers BAS40E6327HTSA1 and BAS40E6433HTMA1 as parametric equivalents with 1 µA reverse leakage @ 30 V. Nexperia USA Inc. offers BAS40,215 and BAS40,235 with 10 µA reverse leakage @ 40 V and AEC-Q100 automotive qualification. Both manufacturers provide active products with identical core specifications. Selection depends on reverse leakage tolerance and automotive qualification requirements.

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