MMBD4448-7 Equivalent & Substitute Parts

Part Overview

The MMBD4448-7 is a general-purpose rectifier diode manufactured by Diodes Incorporated, rated for 75 V DC reverse voltage and 250 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 and procurement requirements. Equivalent parts maintain identical or superior electrical characteristics within the same package footprint, while substitute parts offer functional alternatives with minor parameter variations.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	250	mA
Voltage - Forward (Vf) (Max) @ If	1.25 @ 150	V @ mA
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	2.5 @ 75	µA @ V
Capacitance @ Vr, F	4 @ 0, 1MHz	pF @ V, MHz
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 of the MMBD4448-7 is determined by the following critical parameters: DC reverse voltage rating (75 V minimum), average rectified current capacity (250 mA minimum for direct equivalents), forward voltage drop (1.25 V maximum at 150 mA), recovery speed characteristics, and package compatibility (SOT-23-3). Parts are grouped into three categories:

Category 1: Direct Equivalents (Identical Current Rating) Parts maintaining 250 mA current rating with identical voltage and speed specifications. These include MMBD4448-7-F and MMBD4448W-7-F, both active products with RoHS3 compliance.

Category 2: Parametric Equivalents (Higher Current Rating) Parts rated for 300 mA current capacity with identical voltage and speed characteristics. BAL99-7 and BAL99-7-F provide increased current headroom while maintaining all other electrical parameters.

Category 3: Manufacturer-Recommended Alternatives (Reduced Current Rating) Parts with lower current ratings (200 mA or 150 mA) but identical voltage ratings and compatible packages. BAS116LT1G and BAS16-E3-18 are manufacturer-recommended alternatives with different speed classifications and leakage characteristics.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	Speed	trr [ns/µs]	Ir @ Vr [µA/nA]	Package	Product Status	RoHS Status
MMBD4448-7	Diodes Incorporated	75	250	1.25 @ 150	Fast Recovery ≤ 500ns, > 200mA	4	2.5 @ 75	SOT-23-3	Discontinued	Non-compliant
MMBD4448-7-F	Diodes Incorporated	75	250	1.25 @ 150	Fast Recovery ≤ 500ns, > 200mA	4	2.5 @ 75	SOT-23-3	Active	ROHS3 Compliant
MMBD4448W-7-F	Diodes Incorporated	75	250	1.25 @ 150	Fast Recovery ≤ 500ns, > 200mA	4	1 @ 75	SOT-23-3	Active	ROHS3 Compliant
MMBD4448-TP	Micro Commercial Co	75	250	1.25 @ 150	Fast Recovery ≤ 500ns, > 200mA	4	2.5 @ 75	SOT-23-3	Active	ROHS3 Compliant
BAL99-7	Diodes Incorporated	75	300	1.25 @ 150	Fast Recovery ≤ 500ns, > 200mA	4	2.5 @ 75	SOT-23-3	Discontinued	Non-compliant
BAL99-7-F	Diodes Incorporated	75	300	1.25 @ 150	Fast Recovery ≤ 500ns, > 200mA	4	2.5 @ 75	SOT-23-3	Active	ROHS3 Compliant
BAS116LT1G	onsemi	75	200	1.25 @ 150	Small Signal ≤ 200mA, Any Speed	3 µs	5 nA @ 75	SOT-23-3	Active	ROHS3 Compliant
BAS16-E3-18	Vishay General Semiconductor	75	150	1.25 @ 150	Small Signal ≤ 200mA, Any Speed	6	1 @ 75	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): MMBD4448-7-F is the primary active equivalent, manufactured by Diodes Incorporated with identical electrical parameters and RoHS3 compliance. This part is available in Cut Tape and Digi-Reel packaging with 55,839 units in stock. MMBD4448W-7-F offers the same current and voltage ratings with improved reverse leakage characteristics (1 µA versus 2.5 µA) and is available in Tape & Reel packaging. MMBD4448-TP, manufactured by Micro Commercial Co, provides an alternative source with identical specifications and active product status.

For Increased Current Capacity: BAL99-7-F is recommended when designs require higher current capacity (300 mA versus 250 mA) while maintaining identical voltage ratings, speed characteristics, and package compatibility. This part is RoHS3 compliant and active with 17,420 units in stock.

For Reduced Current Applications: BAS116LT1G (onsemi) and BAS16-E3-18 (Vishay) are manufacturer-recommended alternatives suitable for applications requiring lower current ratings (200 mA and 150 mA respectively). Both parts maintain the 75 V voltage rating and SOT-23-3 package compatibility. These parts employ small signal diode technology with different recovery time characteristics and are RoHS3 compliant.

Compliance Considerations: The original MMBD4448-7 is RoHS non-compliant. All active substitute parts listed are RoHS3 compliant, meeting current regulatory requirements for new designs and procurement.

Frequently Asked Questions (FAQ)

Q: Can MMBD4448-7-F be used as a direct replacement for MMBD4448-7? A: Yes. MMBD4448-7-F maintains identical electrical specifications including 75 V reverse voltage, 250 mA average rectified current, 1.25 V forward voltage drop at 150 mA, 4 ns reverse recovery time, and SOT-23-3 package compatibility. The primary difference is product status (active versus discontinued) and RoHS3 compliance.

Q: What is the difference between MMBD4448-7-F and MMBD4448W-7-F? A: Both parts share identical voltage, current, and speed ratings with SOT-23-3 packaging. MMBD4448W-7-F features lower reverse leakage current (1 µA at 75 V versus 2.5 µA) and lower capacitance (2 pF versus 4 pF at 0 V, 1 MHz). Selection depends on leakage and capacitance requirements for the specific application.

Q: Can BAL99-7-F replace MMBD4448-7 in all applications? A: BAL99-7-F is electrically compatible with identical voltage, forward voltage, speed, and recovery time specifications. The primary difference is higher current rating (300 mA versus 250 mA), which provides additional design margin. Package compatibility is identical (SOT-23-3). Substitution is valid for applications operating at or below 250 mA.

Q: Why would BAS116LT1G or BAS16-E3-18 be selected over direct equivalents? A: These parts are suitable only for applications where current requirements are lower than the original specification. BAS116LT1G is rated for 200 mA and BAS16-E3-18 for 150 mA. Both employ small signal diode technology with different recovery characteristics. Selection is appropriate only when circuit current demands do not exceed these ratings.

Q: Are all substitute parts available in the same packaging options? A: All listed parts use SOT-23-3 package footprint compatibility. Packaging formats differ: MMBD4448-7-F is available in Cut Tape and Digi-Reel; MMBD4448W-7-F and BAL99-7-F are supplied in Tape & Reel; BAS116LT1G and BAS16-E3-18 are supplied in Tape & Reel. Verify packaging requirements for procurement and assembly processes.

Q: What is the operating temperature range difference between MMBD4448-7 and substitute parts? A: MMBD4448-7 operates from -65°C to 150°C junction temperature. MMBD4448-7-F, MMBD4448W-7-F, and BAL99-7-F maintain the same -65°C to 150°C range. BAS116LT1G and BAS16-E3-18 operate from -55°C to 150°C, providing a narrower low-temperature range. Verify application requirements before substitution in extreme temperature environments.

Q: Is RoHS compliance a factor in selecting substitute parts? A: The original MMBD4448-7 is RoHS non-compliant. All active substitute parts listed (MMBD4448-7-F, MMBD4448W-7-F, MMBD4448-TP, BAL99-7-F, BAS116LT1G, BAS16-E3-18) are RoHS3 compliant. New designs and procurement should utilize RoHS3 compliant alternatives to meet current regulatory and customer requirements.

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