SMMBD301LT3G Equivalent & Substitute Parts

Part Overview

The SMMBD301LT3G is a Schottky rectifier diode manufactured by onsemi, rated for 30 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. This component is classified as Active product status and carries AEC-Q101 automotive qualification. The device is designed for applications requiring fast switching characteristics and low forward voltage drop typical of Schottky technology.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter ranges. Alternative sources may be required due to supply chain considerations, manufacturing availability, or design flexibility across qualified component families.

Substiute Parts

SMMBD301LT3G

onsemiIn Stock: 5883SMMBD301LT3G Datasheet

Current PartRFQ

TBAT54,LM

Toshiba Semiconductor and StorageIn Stock: 1000424TBAT54,LM Datasheet

DirectRFQ

TBAT54S,LM

Toshiba Semiconductor and StorageIn Stock: 4171TBAT54S,LM Datasheet

DirectRFQ

BAT54 RFG

Taiwan Semiconductor CorporationIn Stock: 48220BAT54 RFG Datasheet

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BAT54-E3-18

Vishay General Semiconductor - Diodes DivisionIn Stock: 19308BAT54-E3-18 Datasheet

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BAT54-G3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 27127BAT54-G3-08 Datasheet

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CMPSH-3 TR PBFREE

Central Semiconductor CorpIn Stock: 2677CMPSH-3 TR PBFREE Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMMBD301LT3G is determined by the following critical parameters:

Mandatory Matching Criteria:

• Voltage - DC Reverse (Vr) (Max): 30 V
• Technology: Schottky
• Package / Case: TO-236-3, SC-59, SOT-23-3 (surface mount compatibility)
• Current - Average Rectified (Io): 200 mA or greater
• Mounting Type: Surface Mount

Acceptable Variation Parameters:

• Voltage - Forward (Vf) (Max) @ If: Forward voltage may vary within application tolerance
• Current - Reverse Leakage @ Vr: Leakage current variation acceptable if within design margins
• Capacitance @ Vr, F: Capacitance variation acceptable for non-frequency-critical applications
• Operating Temperature - Junction: Maximum junction temperature may exceed 125°C
• Reverse Recovery Time (trr): Parameter variation acceptable for switching applications

Compliance Requirements:

• Product Status: Active
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Substitute parts are grouped as Direct Equivalents when all mandatory criteria are met with identical current ratings. Similar alternatives are identified when current ratings meet or exceed the 200 mA requirement while maintaining all other mandatory parameters.

Parameter Comparison

Engineering Selection Recommendations

Direct Equivalent Substitutes (200 mA Current Rating):

The following parts maintain full electrical and mechanical compatibility with the SMMBD301LT3G:

• TBAT54S,LM (Toshiba Semiconductor and Storage): Diode array configuration with 1 pair series connection, 200 mA per diode, operating temperature range -55 to 150°C. All compliance certifications match (ROHS3, REACH Unaffected, MSL 1).

• BAT54 RFG (Taiwan Semiconductor Corporation): Single diode, 200 mA rating, operating temperature -55 to 125°C. Meets all mandatory electrical and compliance requirements.

• BAT54-E3-18 (Vishay General Semiconductor - Diodes Division): Single diode, 200 mA rating, maximum junction temperature 125°C. Full compliance with ROHS3 and MSL 1 specifications.

• BAT54-G3-08 (Vishay General Semiconductor - Diodes Division): Single diode, 200 mA rating, maximum junction temperature 125°C. Supplied in Cut Tape (CT) & Digi-Reel® packaging. Full compliance with ROHS3 and MSL 1 specifications.

Reduced Current Rating Substitute (140 mA / 100 mA):

• TBAT54,LM (Toshiba Semiconductor and Storage): Single diode, 140 mA rating. Suitable for applications where current requirement does not exceed 140 mA. Operating temperature maximum 150°C exceeds original specification.

• CMPSH-3 TR PBFREE (Central Semiconductor Corp): Single diode, 100 mA rating. Suitable only for applications where current requirement does not exceed 100 mA. Extended operating temperature range -65 to 150°C provides thermal margin.

All substitute parts maintain Active product status, ROHS3 compliance, and MSL 1 (Unlimited) moisture sensitivity rating. Selection between direct equivalents should be based on packaging format availability (Tape & Reel versus Cut Tape), manufacturer qualification requirements, and supply chain considerations.

Frequently Asked Questions (FAQ)

Q: Can TBAT54,LM (140 mA) be used as a direct replacement for SMMBD301LT3G (200 mA)?

A: TBAT54,LM is not a direct replacement. The 140 mA current rating is below the 200 mA specification of the SMMBD301LT3G. This substitute is acceptable only in applications where the actual circuit current requirement does not exceed 140 mA. Circuit design review is required to confirm current margins.

Q: What is the difference between BAT54-E3-18 and BAT54-G3-08?

A: Both parts are manufactured by Vishay and share identical electrical specifications (30 V, 200 mA, SOT-23-3 package). The primary difference is packaging format: BAT54-E3-18 is supplied in Tape & Reel (TR), while BAT54-G3-08 is supplied in Cut Tape (CT) & Digi-Reel®. Electrical performance and compliance are equivalent.

Q: Is TBAT54S,LM a diode array or a single diode?

A: TBAT54S,LM is a diode array configured as 1 pair series connection in a single SOT-23-3 package. Each diode in the pair is rated for 200 mA. This configuration differs from single-diode alternatives but maintains the same package footprint and voltage/current ratings per diode element.

Q: Can CMPSH-3 TR PBFREE be used in high-current applications?

A: CMPSH-3 TR PBFREE is rated for 100 mA average rectified current, which is 50% of the SMMBD301LT3G specification. This part is suitable only for applications with maximum current requirements of 100 mA or less. Use in higher-current circuits will result in device overstress.

Q: Are all substitute parts automotive-qualified?

A: The SMMBD301LT3G carries AEC-Q101 automotive qualification. Substitute parts listed do not explicitly state AEC-Q101 qualification in the provided specifications. Applications requiring automotive qualification should confirm qualification status with the respective manufacturer before selection.

Q: What is the significance of forward voltage (Vf) variation among substitutes?

A: Forward voltage varies from 580 mV to 1 V across the substitute parts. This variation affects power dissipation and circuit performance. Applications sensitive to forward voltage drop (such as precision rectification or low-voltage circuits) should select substitutes with Vf specifications closest to the original 600 mV @ 10 mA rating.

Q: Do all substitutes have the same package footprint?

A: All listed substitutes use TO-236-3, SC-59, or SOT-23-3 package designations, which are mechanically and electrically equivalent. PCB footprints are identical, allowing direct board-level substitution without layout modification.

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

A: The SMMBD301LT3G specifies 200 nA @ 25 V leakage current, while most substitutes specify 2 µA @ 25 V (10 times higher). CMPSH-3 TR PBFREE specifies 500 nA. Higher leakage current increases standby power consumption. Applications with strict leakage requirements should prioritize SMMBD301LT3G or CMPSH-3 TR PBFREE.

Q: Can substitutes with higher maximum junction temperature be used in place of the original part?

A: Yes. Substitutes with maximum junction temperatures of 150°C (TBAT54,LM, TBAT54S,LM, CMPSH-3 TR PBFREE) provide additional thermal margin compared to the 125°C specification of SMMBD301LT3G. This represents a design advantage in high-temperature environments but does not affect compatibility in standard operating conditions.