MMBD2838 Equivalent & Substitute Parts

Part Overview

The MMBD2838 is a general-purpose diode array in a 1 Pair Common Cathode configuration, rated for 75 V DC reverse voltage and 200 mA average rectified current per diode. Manufactured by onsemi, this component is packaged in SOT-23-3 (TO-236-3, SC-59) surface mount format. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility through matching diode configuration, package type, and electrical performance within acceptable operating parameters.

Key Parameters

Parameter	Value	Unit
Diode Configuration	1 Pair Common Cathode	—
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io) (per Diode)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	—
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	100 nA @ 50 V	—
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount	—
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Technology	Standard	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the MMBD2838 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Diode Configuration: Must be 1 Pair Common Cathode
Package Type: Must be SOT-23-3 (TO-236-3, SC-59) surface mount
Voltage - DC Reverse (Vr): Must be equal to or greater than 75 V
Current - Average Rectified (Io): Must be equal to or greater than 200 mA per diode
Operating Temperature Range: Must support -55°C to 150°C junction temperature
Technology: Standard diode technology
Compliance: ROHS3 compliant, MSL 1 (Unlimited)

Substitute parts are grouped into two categories based on voltage rating:

Category A - Direct Voltage Equivalents (100 V Rating): Parts with 100 V DC reverse voltage rating provide enhanced voltage margin while maintaining all other electrical specifications. These include BAV70LT1G, BAV70LT3G, SBAV70LT1G, and SBAV70LT3G from onsemi, plus MMBD4148CC from EVVO Semi.

Category B - Intermediate Voltage Equivalents (80 V Rating): Parts with 80 V DC reverse voltage rating from Infineon Technologies (BAV170E6327HTSA1, BAV170E6433HTMA1, BAV70E6327HTSA1, BAV70E6433HTMA1) provide voltage margin above the 75 V requirement while maintaining 200 mA current rating.

Category C - Reduced Performance Variant: MMBD2838LT1G from onsemi shares the same base product number but operates at reduced voltage (50 V) and current (100 mA) ratings, suitable only for applications with lower electrical requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io (per Diode) [mA]	Vf (Max) @ If	trr [ns]	Ir @ Vr	Tj (°C)	Package	Status
MMBD2838	onsemi	75	200	1.2 V @ 100 mA	4	100 nA @ 50 V	-55 to 150	SOT-23-3	Obsolete
BAV70LT1G	onsemi	100	200	1.25 V @ 150 mA	6	2.5 µA @ 70 V	-55 to 150	SOT-23-3	Active
BAV70LT3G	onsemi	100	200	1.25 V @ 150 mA	6	2.5 µA @ 70 V	-55 to 150	SOT-23-3	Active
MMBD2838LT1G	onsemi	50	100	1.2 V @ 100 mA	4	100 nA @ 50 V	-55 to 150	SOT-23-3	Active
MMBD4148CC	EVVO Semi	100	200	1 V @ 10 mA	4	5 µA @ 75 V	-55 to 150	SOT-23-3	Active
SBAV70LT1G	onsemi	100	200	1.25 V @ 150 mA	6	100 µA @ 70 V	-55 to 150	SOT-23-3	Active
SBAV70LT3G	onsemi	100	200	1.25 V @ 150 mA	6	100 µA @ 70 V	-55 to 150	SOT-23-3	Active
BAV170E6327HTSA1	Infineon Technologies	80	200	1.25 V @ 150 mA	1.5 µs	5 nA @ 75 V	-55 to 150	SOT-23-3	Last Time Buy
BAV170E6433HTMA1	Infineon Technologies	80	200	1.25 V @ 150 mA	1.5 µs	5 nA @ 75 V	-55 to 150	SOT-23-3	Last Time Buy
BAV70E6327HTSA1	Infineon Technologies	80	200	1.25 V @ 150 mA	4	150 nA @ 70 V	-55 to 150	SOT-23-3	Last Time Buy
BAV70E6433HTMA1	Infineon Technologies	80	200	1.25 V @ 150 mA	4	150 nA @ 70 V	-55 to 150	SOT-23-3	Last Time Buy

Engineering Selection Recommendations

Recommended Primary Substitutes (Active Status):

The BAV70LT1G and BAV70LT3G from onsemi are the preferred direct substitutes for the obsolete MMBD2838. Both parts maintain the 1 Pair Common Cathode configuration, SOT-23-3 package, and 200 mA current rating while providing enhanced voltage capability at 100 V DC reverse rating. Both are in active production status with substantial inventory availability (605,400 and 75,400 units respectively). These parts are ROHS3 compliant and maintain the same operating temperature range (-55°C to 150°C).

Automotive-Grade Alternative:

The SBAV70LT1G and SBAV70LT3G from onsemi provide equivalent electrical performance to the BAV70 series with automotive-grade qualification (AEC-Q101). These parts are suitable for applications requiring automotive-level reliability and traceability. SBAV70LT1G offers 179,200 units in inventory, while SBAV70LT3G provides 65,100 units.

Alternative Manufacturer Option:

The MMBD4148CC from EVVO Semi meets all substitution criteria with 100 V DC reverse voltage and 200 mA current rating in SOT-23-3 package. This part offers 305,100 units in inventory and is in active production status.

Transitional Substitutes (Last Time Buy Status):

The Infineon Technologies parts (BAV170E6327HTSA1, BAV170E6433HTMA1, BAV70E6327HTSA1, BAV70E6433HTMA1) are classified as Last Time Buy and provide 80 V DC reverse voltage with 200 mA current rating. These parts are suitable for applications where voltage margin above 75 V is acceptable but should not be selected for new long-term production due to end-of-life status.

Not Recommended for Direct Substitution:

The MMBD2838LT1G, while sharing the same base product number and manufacturer, operates at reduced electrical ratings (50 V, 100 mA) and is suitable only for applications with lower voltage and current requirements than the original MMBD2838.

Frequently Asked Questions (FAQ)

Q: Can BAV70LT1G directly replace MMBD2838 in existing designs?

A: Yes. The BAV70LT1G maintains the same 1 Pair Common Cathode configuration, SOT-23-3 package footprint, and 200 mA current rating. The 100 V DC reverse voltage rating exceeds the original 75 V specification, providing enhanced voltage margin. Pin configuration and package dimensions are identical, enabling direct PCB substitution.

Q: What is the difference between BAV70LT1G and BAV70LT3G?

A: Both parts are electrically identical with 100 V DC reverse voltage and 200 mA current rating. The difference is in packaging format: BAV70LT1G is supplied in Cut Tape (CT) & Digi-Reel format, while BAV70LT3G is supplied in Cut Tape (CT) & Digi-Reel format. Both are in active production status.

Q: Why do the Infineon parts (BAV170E6327HTSA1, etc.) show Last Time Buy status?

A: Last Time Buy status indicates these parts are approaching end-of-life and will no longer be manufactured after a specified date. While they meet all electrical and package requirements for substitution, they should not be selected for new designs requiring long-term component availability. Active alternatives from onsemi are recommended for new production.

Q: Is SBAV70LT1G suitable for non-automotive applications?

A: Yes. The SBAV70LT1G is an automotive-grade part with AEC-Q101 qualification, but it functions identically to the standard BAV70LT1G in non-automotive applications. The automotive qualification provides additional process control and traceability but does not restrict use in general-purpose applications.

Q: Can MMBD2838LT1G be used as a substitute?

A: No. The MMBD2838LT1G operates at 50 V DC reverse voltage and 100 mA current rating, both significantly lower than the original MMBD2838 (75 V, 200 mA). This part is suitable only for applications with reduced electrical requirements and cannot provide equivalent performance in circuits designed for the original specifications.

Q: What is the significance of the reverse recovery time (trr) differences?

A: The MMBD2838 specifies 4 ns reverse recovery time. Substitute parts from onsemi (BAV70 series) specify 6 ns, while Infineon parts vary between 4 ns and 1.5 µs. For small-signal switching applications operating at frequencies below 200 mA, these differences are within acceptable performance margins. Applications with specific high-frequency switching requirements should evaluate trr specifications against circuit timing constraints.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed are ROHS3 compliant with Moisture Sensitivity Level (MSL) 1 (Unlimited), matching the compliance profile of the original MMBD2838.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Cut Tape (CT) packaging is supplied in individual tape segments suitable for manual handling and small-quantity applications. Tape & Reel (TR) packaging is supplied on continuous reels suitable for automated assembly equipment. Both formats contain identical components; the difference is in supply format and handling method. Selection depends on production volume and assembly equipment capability.

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