BAS40-04T-7 Equivalent & Substitute Parts

Part Overview

The BAS40-04T-7 is a Schottky diode array in a 1 Pair Series Connection configuration, rated for 40 V DC reverse voltage and 200 mA average rectified current per diode. This component is designed for surface mount applications in the SOT-523 package. The BAS40-04T-7 is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement needs.

Substiute Parts

BAS40-04T-7

Diodes IncorporatedIn Stock: 1025BAS40-04T-7 Datasheet

Current PartRFQ

BAS40-04T-7-F

Diodes IncorporatedIn Stock: 35360BAS40-04T-7-F Datasheet

DirectRFQ

BAT54SFILM

STMicroelectronicsIn Stock: 91173BAT54SFILM Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BAS40-04T-7 is determined by the following critical parameters:

Primary Substitution Criteria:

• Diode configuration (1 Pair Series Connection)
• Technology (Schottky)
• Voltage rating (40 V DC reverse minimum)
• Current rating (200 mA DC minimum per diode)
• Reverse recovery time (5 ns)
• Surface mount capability

Packaging Considerations:

• The BAS40-04T-7-F maintains identical electrical specifications and package type (SOT-523), differing only in tape & reel packaging format
• The BAT54SFILM operates in a different package format (SOT-23-3) but maintains core electrical compatibility with enhanced current rating and operating temperature range

Substitutes are valid when all critical electrical parameters meet or exceed the original specification requirements.

Parameter Comparison

Engineering Selection Recommendations

BAS40-04T-7-F (Direct Equivalent)

The BAS40-04T-7-F is the primary substitute for the discontinued BAS40-04T-7. Both parts are manufactured by Diodes Incorporated and share identical electrical specifications, diode configuration, and package type (SOT-523). The BAS40-04T-7-F differs only in packaging format (Tape & Reel versus bulk) and compliance status. The BAS40-04T-7-F is ROHS3 compliant and currently active in production with substantial inventory availability (35,300 units). This part is the direct replacement for applications requiring the SOT-523 package format.

BAT54SFILM (Functional Equivalent with Package Change)

The BAT54SFILM, manufactured by STMicroelectronics, is a functional equivalent that operates within the same electrical parameters but requires PCB layout modification due to package format change (SOT-23-3 instead of SOT-523). The BAT54SFILM provides enhanced specifications including higher current rating (300 mA versus 200 mA), improved forward voltage characteristics (900 mV @ 100 mA), and extended operating temperature range (-40°C to 150°C). Both parts are ROHS3 compliant and currently active. Selection of the BAT54SFILM is appropriate when PCB redesign is feasible and enhanced current capacity is beneficial.

Frequently Asked Questions (FAQ)

Q: Can the BAS40-04T-7-F be used as a direct replacement for the BAS40-04T-7?

A: Yes. The BAS40-04T-7-F is a direct equivalent with identical electrical specifications, diode configuration, and SOT-523 package. The only differences are packaging format (Tape & Reel) and RoHS compliance status. No circuit modifications are required.

Q: What are the key differences between the BAS40-04T-7 and BAT54SFILM?

A: Both parts maintain the same 40 V reverse voltage rating and 5 ns reverse recovery time. The BAT54SFILM provides higher current capacity (300 mA versus 200 mA per diode), operates across a wider temperature range (-40°C to 150°C versus -55°C to 125°C), and uses a different package format (SOT-23-3 versus SOT-523). Forward voltage characteristics also differ slightly.

Q: Is package compatibility a concern when substituting with BAT54SFILM?

A: Yes. The BAT54SFILM uses the SOT-23-3 package while the original BAS40-04T-7 uses SOT-523. These packages have different pin configurations and footprints. PCB layout modification is required for BAT54SFILM substitution.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the BAS40-04T-7-F and BAT54SFILM are ROHS3 compliant. The original BAS40-04T-7 is RoHS non-compliant.

Q: Which substitute part should be selected for new designs?

A: For applications requiring the SOT-523 package format, select the BAS40-04T-7-F. For applications where package redesign is acceptable and enhanced current capacity is beneficial, the BAT54SFILM is suitable. Both parts are currently in active production with adequate inventory.

Q: What is the reverse leakage current difference between the substitutes?

A: The BAS40-04T-7 and BAS40-04T-7-F both specify 200 nA @ 30 V reverse leakage. The BAT54SFILM specifies 1 µA @ 30 V, representing a higher leakage current. This difference is relevant for low-power or precision applications.