MMBD4148-7 Equivalent & Substitute Parts

Part Overview

The MMBD4148-7 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 75 V DC reverse voltage and 300 mA average rectified current in a surface-mount SOT-23-3 package. This part is discontinued at DiGi Electronics, necessitating identification of equivalent and substitute components for ongoing design support and procurement. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts offer functional alternatives with variations in specific parameters such as voltage rating, current capacity, or speed classification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	300	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 150	V @ mA
Speed Classification	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	1	µA @ 75 V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-65 to 150	°C
RoHS Status	RoHS non-compliant	—

Substitute Part Grouping Explanation

Substitution logic for the MMBD4148-7 is determined by the following critical parameters:

Parametric Equivalents maintain all electrical specifications: 75 V reverse voltage, 300 mA average rectified current, 1.25 V forward voltage at 150 mA, 4 ns reverse recovery time, and identical SOT-23-3 packaging. These parts differ only in product status (active vs. discontinued) and RoHS compliance. Parametric equivalents include BAS16-7-F, BAS16Q-13-F, BAS16Q-7-F, MMBD4148-7-F, and MMBD914-7-F.

Manufacturer-Recommended Substitutes deviate from one or more electrical parameters while maintaining SOT-23-3 package compatibility and surface-mount mounting type. Deviations include:

Reduced current rating (200 mA vs. 300 mA): BAS116LT1G, BAS16LT1G, BAS16LT3G
Increased voltage rating (100 V vs. 75 V): BAS16LT1G, BAS16LT3G, MMBD4148-TP, SMBD914E6327HTSA1
Reduced current rating with increased voltage: BAS116LT1G, BAS16LT1G, BAS16LT3G, MMBD4148-TP
Speed classification change (Small Signal vs. Fast Recovery): BAS116LT1G, BAS16LT1G, BAS16LT3G, MMBD4148-TP

All substitute parts maintain the SOT-23-3 package footprint and surface-mount technology, ensuring mechanical compatibility with existing PCB designs.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	trr [ns]	Speed	Package	Product Status	RoHS
MMBD4148-7	Diodes Incorporated	75	300	1.25 @ 150	4	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Discontinued	Non-compliant
BAS16-7-F	Diodes Incorporated	75	300	1.25 @ 150	4	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
BAS16Q-13-F	Diodes Incorporated	75	300	1.25 @ 150	4	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
BAS16Q-7-F	Diodes Incorporated	75	300	1.25 @ 150	4	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
MMBD4148-7-F	Diodes Incorporated	75	300	1.25 @ 150	4	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
MMBD914-7-F	Diodes Incorporated	75	300	1.25 @ 150	4	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Active	ROHS3 Compliant
BAS116LT1G	onsemi	75	200	1.25 @ 150	3000	Small Signal ≤ 200mA, Any Speed	SOT-23-3	Active	ROHS3 Compliant
BAS16LT1G	onsemi	100	200	1.25 @ 150	6	Small Signal ≤ 200mA, Any Speed	SOT-23-3	Active	ROHS3 Compliant
BAS16LT3G	onsemi	100	200	1.25 @ 150	6	Small Signal ≤ 200mA, Any Speed	SOT-23-3	Active	ROHS3 Compliant
MMBD4148-TP	Micro Commercial Co	100	150	855 mV @ 10	4	Small Signal ≤ 200mA, Any Speed	SOT-23-3	Active	ROHS3 Compliant
SMBD914E6327HTSA1	Infineon Technologies	100	250	1.25 @ 150	4	Fast Recovery ≤ 500ns, > 200mA	SOT-23-3	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

For applications requiring identical electrical performance and specifications, the following active parts are direct replacements for the discontinued MMBD4148-7:

BAS16-7-F (Diodes Incorporated): Identical specifications with ROHS3 compliance and active product status. Available in Cut Tape and Digi-Reel packaging with 310,700 units in stock.
BAS16Q-7-F (Diodes Incorporated): Identical specifications with automotive-grade qualification (AEC-Q101) and ROHS3 compliance. Available with 158,300 units in stock.
MMBD4148-7-F (Diodes Incorporated): Identical specifications with ROHS3 compliance and active product status. Available in Cut Tape and Digi-Reel packaging with 74,100 units in stock.
MMBD914-7-F (Diodes Incorporated): Identical specifications with ROHS3 compliance and active product status. Available in Cut Tape and Digi-Reel packaging with 1,376 units in stock.

Conditional Substitutes (Parameter Deviations):

For applications where reduced current capacity or increased voltage rating is acceptable:

BAS116LT1G (onsemi): Maintains 75 V reverse voltage but reduces current to 200 mA. Suitable for designs where maximum current demand does not exceed 200 mA. Speed classification changes to Small Signal. ROHS3 compliant with 17,300 units in stock.
BAS16LT1G and BAS16LT3G (onsemi): Increase reverse voltage to 100 V but reduce current to 200 mA. Suitable for designs requiring higher voltage margin. Speed classification changes to Small Signal. ROHS3 compliant with 665,100 and 18,150 units in stock respectively.
MMBD4148-TP (Micro Commercial Co): Increases reverse voltage to 100 V but reduces current to 150 mA. Speed classification changes to Small Signal. ROHS3 compliant with 30,100 units in stock.
SMBD914E6327HTSA1 (Infineon Technologies): Increases reverse voltage to 100 V and reduces current to 250 mA. Maintains Fast Recovery speed classification. Product status is Last Time Buy. ROHS3 compliant with 57,118 units in stock.

All substitute parts maintain SOT-23-3 package compatibility and surface-mount mounting technology. Selection should be based on circuit requirements for voltage margin, current capacity, and speed performance.

Frequently Asked Questions (FAQ)

Q: Can BAS16-7-F be used as a direct replacement for MMBD4148-7?

A: Yes. BAS16-7-F is a parametric equivalent with identical electrical specifications: 75 V reverse voltage, 300 mA average rectified current, 1.25 V forward voltage at 150 mA, 4 ns reverse recovery time, and SOT-23-3 packaging. The part is active and ROHS3 compliant, addressing the discontinued status of MMBD4148-7.

Q: What is the difference between BAS16Q-7-F and BAS16-7-F?

A: Both parts are parametric equivalents with identical electrical specifications and SOT-23-3 packaging. BAS16Q-7-F includes automotive-grade qualification (AEC-Q101) and is designated for automotive applications. Selection depends on application requirements for automotive certification.

Q: Can I use BAS16LT1G or BAS16LT3G in place of MMBD4148-7?

A: BAS16LT1G and BAS16LT3G are conditional substitutes. They maintain the SOT-23-3 package and forward voltage specification but differ in three parameters: reverse voltage increases to 100 V, average rectified current reduces to 200 mA, and speed classification changes from Fast Recovery to Small Signal. These parts are suitable only if the circuit design accommodates reduced current capacity and does not require fast recovery characteristics.

Q: What does "Last Time Buy" status mean for SMBD914E6327HTSA1?

A: Last Time Buy status indicates that the manufacturer has announced end-of-life for this part. While currently available, future procurement may become impossible. This part should be considered only for applications where no other suitable alternatives exist, and long-term supply cannot be guaranteed.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original MMBD4148-7 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the listed substitute parts satisfy this requirement.

Q: Does package compatibility guarantee mechanical interchangeability?

A: Yes. All listed parts use the SOT-23-3 package (also designated TO-236-3 or SC-59), ensuring identical PCB footprint and surface-mount assembly compatibility. No PCB redesign is required for mechanical substitution.

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

A: Reverse recovery time affects switching speed and is critical in high-frequency applications. The original MMBD4148-7 has 4 ns trr (Fast Recovery classification). Substitutes with longer trr values (such as BAS116LT1G at 3 µs) are classified as Small Signal and may not perform identically in fast-switching circuits. Verify circuit operating frequency before selecting parts with different trr specifications.

Q: Can I use MMBD4148-TP as a substitute if my circuit operates at lower currents?

A: MMBD4148-TP is a conditional substitute suitable only if circuit current demand does not exceed 150 mA (the part's rated capacity). The part also increases reverse voltage to 100 V and changes speed classification to Small Signal. Verify that both current and speed requirements are met before selection.

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