BAS40WT-TP Equivalent & Substitute Parts

Part Overview

The BAS40WT-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 40 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-323 package. This component is classified as Active product status and is RoHS3 compliant. Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to inventory constraints, supply chain considerations, or design flexibility needs.

Substiute Parts

BAS40WT-TP

Micro Commercial CoIn Stock: 3819BAS40WT-TP Datasheet

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BAS40W-7-F

Diodes IncorporatedIn Stock: 29332BAS40W-7-F Datasheet

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RB450FT106

Rohm SemiconductorIn Stock: 2294RB450FT106 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BAS40WT-TP is determined by the following critical parameters:

Primary Substitution Criteria:

• Voltage - DC Reverse (Vr) (Max): 40 V minimum
• Current - Average Rectified (Io): 200 mA minimum
• Package / Case: SC-70, SOT-323 (mechanical compatibility)
• Technology: Schottky (functional equivalence)
• RoHS Status: ROHS3 Compliant (regulatory compliance)

Secondary Compatibility Parameters:

• Voltage - Forward (Vf) (Max) @ If: 1 V @ 40 mA or lower
• Reverse Recovery Time (trr): 5 ns or lower
• Operating Temperature - Junction: -55°C minimum, 125°C minimum
• Mounting Type: Surface Mount

Parts meeting all primary criteria and maintaining secondary parameter specifications are classified as direct substitutes. Parts with reduced current ratings or modified package designations are classified as partial substitutes with application-specific limitations.

Parameter Comparison

Engineering Selection Recommendations

BAS40W-7-F (Diodes Incorporated) - Direct Substitute

The BAS40W-7-F is a direct electrical and mechanical substitute for the BAS40WT-TP. Both components share identical voltage ratings (40 V), current ratings (200 mA), forward voltage characteristics (1 V @ 40 mA), reverse recovery time (5 ns), and package designation (SC-70, SOT-323). Both are ROHS3 compliant and maintain Unlimited moisture sensitivity level (MSL 1). The BAS40W-7-F exhibits superior reverse leakage performance (200 nA @ 30 V versus 1 µA @ 30 V), representing a functional improvement. The operating temperature range of the BAS40W-7-F extends to 125°C maximum, which is lower than the BAS40WT-TP (150°C maximum). This component is suitable for applications where the BAS40WT-TP is specified and thermal requirements do not exceed 125°C.

RB450FT106 (Rohm Semiconductor) - Partial Substitute

The RB450FT106 is a partial substitute with application-specific limitations. This component shares the 40 V voltage rating and SC-70, SOT-323 package compatibility. However, the average rectified current rating is 100 mA, which is 50% of the BAS40WT-TP specification. The forward voltage is lower (450 mV @ 10 mA), indicating superior switching characteristics. The RB450FT106 is suitable only for applications where the circuit current requirement does not exceed 100 mA. The maximum operating temperature is specified as 125°C. This component is ROHS3 compliant and maintains MSL 1 rating. Selection of the RB450FT106 requires verification that circuit current demands remain within the 100 mA maximum specification.

Frequently Asked Questions (FAQ)

Q: Can BAS40W-7-F be used as a direct replacement for BAS40WT-TP in all applications?

A: The BAS40W-7-F is electrically and mechanically compatible with the BAS40WT-TP for applications operating at or below 125°C junction temperature. Both components have identical voltage (40 V), current (200 mA), forward voltage (1 V @ 40 mA), and package specifications (SOT-323). The BAS40W-7-F exhibits lower reverse leakage current, which is a functional improvement. Applications requiring junction temperatures above 125°C must use the BAS40WT-TP, which is rated to 150°C.

Q: What are the limitations of using RB450FT106 as a substitute?

A: The RB450FT106 has a maximum average rectified current rating of 100 mA, compared to 200 mA for the BAS40WT-TP. This component is suitable only for circuits where the average rectified current does not exceed 100 mA. The voltage rating (40 V) and package (SOT-323) are compatible. The maximum operating temperature is 125°C. Applications requiring 200 mA current capacity must use the BAS40WT-TP or BAS40W-7-F.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The BAS40W-7-F and RB450FT106 are both ROHS3 compliant, matching the compliance status of the BAS40WT-TP. All three components are REACH unaffected and classified under ECCN EAR99.

Q: What is the difference in reverse leakage current between the main part and substitutes?

A: The BAS40WT-TP has reverse leakage of 1 µA @ 30 V. The BAS40W-7-F has superior performance at 200 nA @ 30 V. The RB450FT106 has reverse leakage of 1 µA @ 10 V. Lower reverse leakage current indicates reduced standby power consumption and improved high-temperature stability.

Q: Can packaging format (Tape & Reel versus Cut Tape) affect substitution decisions?

A: Packaging format affects procurement and handling but does not impact electrical or mechanical compatibility. The BAS40WT-TP is supplied in Tape & Reel (TR) format, while the RB450FT106 is supplied in Cut Tape (CT) & Digi-Reel® format. Both formats are compatible with standard surface mount assembly equipment. Selection between formats depends on production volume and assembly line requirements.

Q: What is the significance of the 5 ns reverse recovery time specification?

A: Reverse recovery time (trr) of 5 ns indicates the speed at which the diode transitions from forward conduction to reverse blocking. Both the BAS40WT-TP and BAS40W-7-F specify 5 ns, indicating identical switching performance. The RB450FT106 does not specify reverse recovery time in the provided data. Lower reverse recovery time reduces switching losses and improves high-frequency performance.

Q: Are there temperature derating considerations for these components?

A: The BAS40WT-TP is rated to 150°C junction temperature, while the BAS40W-7-F is rated to 125°C. The RB450FT106 specifies 125°C maximum. Applications operating near maximum junction temperature should account for component derating and thermal management. The BAS40WT-TP provides additional thermal margin for high-temperature environments.