MMBD301LT3 Schottky Diode Equivalent & Substitute Parts

Part Overview

The MMBD301LT3 is an RF Schottky diode manufactured by onsemi, rated for 30V peak reverse voltage with 200mW power dissipation in a SOT-23-3 surface mount package. This part is classified as obsolete, making equivalent substitutes necessary for new designs and production continuity. Direct replacements and functionally equivalent alternatives are available from multiple manufacturers with active product status and improved compliance certifications.

Key Parameters

Parameter	MMBD301LT3
Manufacturer	onsemi
Diode Type	Schottky - Single
Voltage - Peak Reverse (Max)	30V
Power Dissipation (Max)	200 mW
Capacitance @ Vr, F	1.5pF @ 15V, 1MHz
Operating Temperature	-55°C ~ 125°C (TJ)
Package / Case	TO-236-3, SC-59, SOT-23-3
Product Status	Obsolete
RoHS Status	RoHS non-compliant

Substitute Part Grouping Explanation

Substitution for the MMBD301LT3 is determined by the following critical parameters:

Voltage Rating: 30V peak reverse voltage (Vr) maximum
Package Type: SOT-23-3 (TO-236-3, SC-59) surface mount configuration
Diode Technology: Schottky barrier construction
Power Dissipation: 200mW or greater capacity
Operating Temperature Range: -55°C to 125°C or higher

Substitute parts are grouped into two categories:

Direct Equivalents maintain identical electrical specifications and packaging, differing only in manufacturer or packaging format (bulk vs. tape & reel).

Functional Equivalents meet or exceed the core electrical requirements (30V rating, SOT-23-3 package, Schottky technology) while offering enhanced specifications such as higher current ratings, improved forward voltage characteristics, or superior compliance certifications. These parts are pin-compatible and functionally interchangeable in applications where the MMBD301LT3 was specified.

Parameter Comparison

Part Number	Manufacturer	Voltage - Peak Reverse (Max)	Power Dissipation / Current Rating	Capacitance @ Vr, F	Operating Temperature (Max)	Package	Product Status	RoHS Status
MMBD301LT3	onsemi	30V	200 mW	1.5pF @ 15V, 1MHz	125°C	SOT-23-3	Obsolete	Non-compliant
MMBD301LT3G	onsemi	30V	200 mW	1.5pF @ 15V, 1MHz	125°C	SOT-23-3	Active	ROHS3 Compliant
MMBD301-TP	Micro Commercial Co	30V	200 mW	Not specified	125°C	SOT-23-3	Active	ROHS3 Compliant
BAT54,215	Nexperia USA Inc.	30V	200mA	10pF @ 1V, 1MHz	150°C	SOT-23-3	Active	ROHS3 Compliant
BAT54,235	Nexperia USA Inc.	30V	200mA	10pF @ 1V, 1MHz	150°C	SOT-23-3	Active	ROHS3 Compliant
BAT754,215	Nexperia USA Inc.	30V	200mA	10pF @ 1V, 1MHz	125°C	SOT-23-3	Active	ROHS3 Compliant
CDBT0230-HF	Comchip Technology	30V	200mA	40pF @ 0V, 1MHz	125°C	SOT-23-3	Active	ROHS3 Compliant
PMEG3005ET,215	Nexperia USA Inc.	30V	500mA	55pF @ 1V, 1MHz	150°C	SOT-23-3	Active	ROHS3 Compliant
PMEG3010ET,215	Nexperia USA Inc.	30V	1A	70pF @ 1V, 1MHz	150°C	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation: MMBD301LT3G

The MMBD301LT3G is the direct successor to the MMBD301LT3, manufactured by onsemi with identical electrical specifications and package configuration. This part is in active production status with ROHS3 compliance certification, making it the preferred choice for direct replacement in existing designs. Inventory availability is substantial at 39,914 pieces.

Alternative Recommendation: MMBD301-TP

The MMBD301-TP from Micro Commercial Co maintains the same 30V rating, 200mW power dissipation, and SOT-23-3 package as the original part. This option provides an alternative source with active product status and ROHS3 compliance. Suitable for applications requiring supply chain diversification.

Higher Current Capacity Options: BAT54,215 / BAT54,235 / BAT754,215

These Nexperia parts offer 200mA current rating (versus 200mW power dissipation specification) with 30V voltage rating and SOT-23-3 packaging. All three maintain active product status and ROHS3 compliance. BAT54,215 and BAT54,235 support operating temperatures to 150°C. BAT754,215 includes automotive-grade qualification (AEC-Q100) with 125°C maximum junction temperature and reduced forward voltage (600mV @ 100mA).

Enhanced Performance Options: PMEG3005ET,215 / PMEG3010ET,215

These Nexperia parts provide higher current ratings (500mA and 1A respectively) while maintaining 30V voltage rating and SOT-23-3 package compatibility. Both support 150°C maximum junction temperature and ROHS3 compliance. PMEG3010ET,215 includes automotive-grade qualification (AEC-Q100). These options are suitable for applications requiring higher current capacity than the original 200mW specification.

Alternative Source: CDBT0230-HF

The Comchip Technology CDBT0230-HF provides 30V rating with 200mA current capacity in SOT-23-3 package. Active product status with ROHS3 compliance. This option offers supply chain flexibility from an alternative manufacturer.

Frequently Asked Questions (FAQ)

Q: Can MMBD301LT3G be used as a direct replacement for MMBD301LT3?

A: Yes. The MMBD301LT3G is electrically and mechanically identical to the MMBD301LT3, with the primary differences being active product status and ROHS3 compliance certification. Pin configuration and package dimensions are identical.

Q: What is the difference between the power dissipation specification (200mW) and current rating (200mA) listed for substitute parts?

A: The original MMBD301LT3 specifies power dissipation (200mW), while many substitute parts specify average rectified current (200mA). Both parameters define the part's thermal and electrical limits. Parts specified with current ratings can handle the equivalent power dissipation under their rated conditions.

Q: Are BAT54 and BAT754 variants interchangeable?

A: BAT54,215 and BAT54,235 are identical electrically and differ only in packaging format (Cut Tape vs. Tape & Reel). BAT754,215 differs in forward voltage characteristics (600mV vs. 800mV @ 100mA) and includes automotive qualification. All three are pin-compatible with the MMBD301LT3 in SOT-23-3 package.

Q: Can PMEG3005ET,215 or PMEG3010ET,215 be used in place of MMBD301LT3?

A: Yes. Both parts maintain 30V voltage rating and SOT-23-3 package compatibility. The higher current ratings (500mA and 1A) represent enhanced specifications that do not compromise backward compatibility. These parts are suitable for applications where higher current capacity is beneficial or required.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. The original MMBD301LT3 is non-compliant. All listed substitutes are ROHS3 compliant, making them suitable for modern manufacturing and regulatory requirements.

Q: Does package format (bulk vs. tape & reel) affect electrical performance?

A: No. Packaging format affects handling, storage, and automated assembly processes but does not alter electrical specifications or performance. Selection between bulk and tape & reel depends on production volume and assembly equipment requirements.

Q: Are automotive-qualified variants (BAT754,215 and PMEG3010ET,215) required for non-automotive applications?

A: No. Automotive qualification (AEC-Q100) indicates additional testing and reliability standards. These parts are fully functional in non-automotive applications. Selection should be based on application requirements rather than qualification status alone.

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