BAS 40-04 B5003 Equivalent & Substitute Parts

Part Overview

The BAS 40-04 B5003 is a Schottky diode array manufactured by Infineon Technologies, configured as 1 pair series connection with a maximum reverse voltage of 40 V and average rectified current of 120 mA per diode. The device is packaged in TO-236-3 (SOT-23-3) surface mount configuration and is classified as obsolete product status.

Due to obsolescence, direct replacement with active production equivalents is necessary for new designs and ongoing procurement. Substitute parts maintain identical electrical specifications while offering active product status and improved availability from multiple manufacturers including Nexperia USA Inc., onsemi, Diodes Incorporated, Micro Commercial Co, and STMicroelectronics.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Series Connection	—
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io) (per Diode)	120	mA (DC)
Voltage - Forward (Vf) (Max) @ If	1	V @ 40 mA
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Operating Temperature - Junction (Max)	150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the BAS 40-04 B5003 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: 1 Pair Series Connection (mandatory)
Technology: Schottky (mandatory)
Voltage - DC Reverse (Vr) (Max): 40 V (mandatory)
Current - Average Rectified (Io) (per Diode): 120 mA minimum (mandatory)
Voltage - Forward (Vf) (Max) @ If: 1 V @ 40 mA (mandatory)
Speed Classification: Small Signal ≤ 200mA (Io), Any Speed (mandatory)
Operating Temperature - Junction (Max): 150°C (mandatory)
Mounting Type: Surface Mount (mandatory)
Package / Case: TO-236-3, SC-59, SOT-23-3 or SC-70, SOT-323 (mandatory for form factor compatibility)
Moisture Sensitivity Level (MSL): 1 (Unlimited) (mandatory)

Substitute Categories:

Category 1: Direct Parametric Equivalents (Identical Specifications, Active Status) Parts BAS4004E6433HTMA1 and BAS4004E6327HTSA1 from Infineon Technologies match all electrical parameters identically. These differ only in packaging format (Tape & Reel versus Cut Tape & Digi-Reel) and represent the active production continuation of the BAS 40-04 series.

Category 2: Automotive-Grade Equivalents (Enhanced Leakage Specification) Parts BAS40-04,215 and BAS40-04,235 from Nexperia USA Inc. maintain all core electrical parameters with automotive qualification (AEC-Q100). Reverse leakage current is specified at 10 µA @ 40 V versus 1 µA @ 30 V in the original part, representing a minor specification variance acceptable for general applications.

Category 3: Compact Package Alternatives (SOT-323 Form Factor) Parts 1PS70SB44,115 and BAS40-04W,115 from Nexperia USA Inc. provide identical electrical performance in SC-70 (SOT-323) package, enabling space-constrained designs. These maintain automotive qualification (AEC-Q100) and are suitable for applications where reduced PCB footprint is required.

Category 4: Enhanced Current Rating Alternatives (200 mA Rated Current) Parts BAS40-04-7-F from Diodes Incorporated and BAS40-04-TP from Micro Commercial Co provide 200 mA average rectified current rating while maintaining 40 V reverse voltage and 1 V forward voltage specifications. These offer increased current margin for applications approaching the 120 mA limit.

Category 5: Standard Equivalent (onsemi Production) Part BAS40-04LT1G from onsemi provides identical electrical specifications in TO-236-3 (SOT-23-3) package with active product status and high inventory availability.

Category 6: Higher Current Capability Alternative (300 mA Rated Current) Part BAT54SFILM from STMicroelectronics provides 300 mA average rectified current rating with identical 40 V reverse voltage and 1 V forward voltage specifications. This part offers significant current margin for applications requiring enhanced thermal headroom or higher current transients.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ If [V @ mA]	Package / Case	Product Status	Automotive Grade
BAS 40-04 B5003	Infineon Technologies	40	120	1 @ 40	TO-236-3, SC-59, SOT-23-3	Obsolete	No
BAS4004E6433HTMA1	Infineon Technologies	40	120	1 @ 40	TO-236-3, SC-59, SOT-23-3	Active	No
BAS4004E6327HTSA1	Infineon Technologies	40	120	1 @ 40	TO-236-3, SC-59, SOT-23-3	Active	No
BAS40-04,215	Nexperia USA Inc.	40	120	1 @ 40	TO-236-3, SC-59, SOT-23-3	Active	Yes (AEC-Q100)
BAS40-04,235	Nexperia USA Inc.	40	120	1 @ 40	TO-236-3, SC-59, SOT-23-3	Active	Yes (AEC-Q100)
1PS70SB44,115	Nexperia USA Inc.	40	120	1 @ 40	SC-70, SOT-323	Active	Yes (AEC-Q100)
BAS40-04-7-F	Diodes Incorporated	40	200	1 @ 40	TO-236-3, SC-59, SOT-23-3	Active	No
BAS40-04-TP	Micro Commercial Co	40	200	1 @ 40	TO-236-3, SC-59, SOT-23-3	Active	No
BAS40-04LT1G	onsemi	40	120	1 @ 40	TO-236-3, SC-59, SOT-23-3	Active	No
BAS40-04W,115	Nexperia USA Inc.	40	120	1 @ 40	SC-70, SOT-323	Active	Yes (AEC-Q100)
BAT54SFILM	STMicroelectronics	40	300	0.9 @ 100	TO-236-3, SC-59, SOT-23-3	Active	No

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications, Same Package):

Select BAS4004E6433HTMA1 or BAS4004E6327HTSA1 from Infineon Technologies for seamless substitution. Both parts maintain identical electrical specifications and TO-236-3 (SOT-23-3) package footprint. Choose based on packaging format: BAS4004E6433HTMA1 for Tape & Reel supply, BAS4004E6327HTSA1 for Cut Tape & Digi-Reel supply. Both are ROHS3 compliant and carry active product status.

For Automotive Applications:

Select BAS40-04,215 or BAS40-04,235 from Nexperia USA Inc. Both parts carry AEC-Q100 automotive qualification and maintain identical electrical specifications in TO-236-3 (SOT-23-3) package. Choose BAS40-04,215 for Cut Tape supply or BAS40-04,235 for Tape & Reel supply based on procurement requirements.

For Space-Constrained Designs:

Select 1PS70SB44,115 or BAS40-04W,115 from Nexperia USA Inc. Both parts provide identical electrical performance in compact SC-70 (SOT-323) package, reducing PCB footprint by approximately 30% compared to SOT-23-3. Both carry AEC-Q100 automotive qualification. Choose based on packaging format preference.

For Enhanced Current Margin:

Select BAS40-04-7-F from Diodes Incorporated or BAS40-04-TP from Micro Commercial Co for applications requiring 200 mA current rating. Both maintain 40 V reverse voltage and 1 V forward voltage specifications while providing 67% higher current capacity than the original 120 mA rating. Both are ROHS3 compliant with active product status.

For Maximum Current Capability:

Select BAT54SFILM from STMicroelectronics for applications requiring 300 mA average rectified current. This part maintains 40 V reverse voltage specification and provides 150% higher current capacity. Forward voltage is specified at 0.9 V @ 100 mA, representing a minor improvement over the 1 V specification. ROHS3 compliant with active product status.

For General-Purpose Applications with High Availability:

Select BAS40-04LT1G from onsemi. This part provides identical electrical specifications in TO-236-3 (SOT-23-3) package with the highest inventory availability (605,200 pieces in stock). ROHS3 compliant with active product status and extended operating temperature range (-55°C to 150°C).

Frequently Asked Questions (FAQ)

Q1: Can I directly replace BAS 40-04 B5003 with BAS4004E6433HTMA1?

Yes. BAS4004E6433HTMA1 provides identical electrical specifications: 40 V reverse voltage, 120 mA average rectified current, 1 V forward voltage @ 40 mA, and identical TO-236-3 (SOT-23-3) package. The only difference is packaging format (Tape & Reel versus bulk). No circuit modifications are required.

Q2: What is the difference between the Infineon BAS4004E6433HTMA1 and BAS4004E6327HTSA1?

Both parts are electrically identical with matching specifications. The difference is packaging format: BAS4004E6433HTMA1 is supplied in Tape & Reel (TR) format, while BAS4004E6327HTSA1 is supplied in Cut Tape (CT) & Digi-Reel format. Select based on your procurement and assembly equipment requirements.

Q3: Should I use the Nexperia automotive-grade parts (BAS40-04,215 or BAS40-04,235) for non-automotive applications?

Automotive-grade parts are suitable for non-automotive applications. The AEC-Q100 qualification indicates enhanced reliability testing and stricter manufacturing controls. These parts are fully compatible with the original BAS 40-04 B5003 specifications and offer improved quality assurance at no electrical performance penalty.

Q4: Can I use 1PS70SB44,115 or BAS40-04W,115 (SOT-323 package) as direct replacements?

These parts are electrically equivalent but use SC-70 (SOT-323) package instead of TO-236-3 (SOT-23-3). PCB layout modifications are required as the package footprint differs. SOT-323 provides approximately 30% smaller footprint, making it suitable for space-constrained designs. Verify PCB layout compatibility before selection.

Q5: What is the advantage of using BAS40-04-7-F or BAS40-04-TP with 200 mA rating?

These parts provide 200 mA average rectified current rating versus 120 mA in the original part, offering 67% additional current margin. This is beneficial for applications approaching the 120 mA limit or requiring thermal headroom for transient current spikes. Electrical specifications (40 V reverse voltage, 1 V forward voltage) remain identical.

Q6: When should I select BAT54SFILM instead of standard BAS40-04 equivalents?

Select BAT54SFILM when your application requires 300 mA average rectified current or when thermal margin is critical. This part provides 150% higher current capacity while maintaining 40 V reverse voltage. Forward voltage is 0.9 V @ 100 mA, representing a slight improvement. Use only if your circuit design can accommodate the higher current rating.

Q7: Are all substitute parts ROHS3 compliant?

Yes. All substitute parts listed carry ROHS3 compliance status. The original BAS 40-04 B5003 does not specify ROHS status, but all active production equivalents meet ROHS3 requirements.

Q8: Which substitute part has the best availability?

BAS40-04LT1G from onsemi has the highest inventory availability with 605,200 pieces in stock. This part provides identical electrical specifications and TO-236-3 (SOT-23-3) package compatibility with the original BAS 40-04 B5003.

Q9: Can I mix different manufacturers' parts in the same design?

Yes. All substitute parts maintain identical electrical specifications (40 V reverse voltage, 120 mA average rectified current, 1 V forward voltage @ 40 mA) and are functionally interchangeable. However, maintain consistent sourcing within a production batch to ensure consistent performance characteristics and supply chain stability.

Q10: What is the difference between "Current - Reverse Leakage @ Vr" specifications across different parts?

Reverse leakage current varies slightly between manufacturers: Infineon specifies 1 µA @ 30 V, Nexperia specifies 10 µA @ 40 V, Diodes Incorporated specifies 200 nA @ 30 V, and STMicroelectronics specifies 1 µA @ 30 V. These variations are within acceptable tolerances for Schottky diode applications and do not affect circuit functionality. Select based on your specific leakage current requirements if your application is leakage-sensitive.

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