MMBD4448W-7-F Equivalent & Substitute Parts

Part Overview

The MMBD4448W-7-F is a general-purpose fast recovery 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 component is actively produced and RoHS3 compliant, making it suitable for standard rectification applications in consumer and industrial electronics.

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges, or when alternative packaging formats of the same base product are required for manufacturing flexibility or inventory availability.

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	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	ROHS3 Compliant	—
Product Status	Active	—

Substitute Part Grouping Explanation

Substitution eligibility for the MMBD4448W-7-F is determined by the following criteria:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 75 V
Current - Average Rectified (Io): Must equal or exceed 250 mA
Voltage - Forward (Vf) (Max) @ If: Must not exceed 1.25 V @ 150 mA
Speed: Must support Fast Recovery ≤ 500ns for currents > 200mA
Reverse Recovery Time (trr): Must not exceed 4 ns
Package / Case: Must be SOT-23-3 compatible (TO-236-3, SC-59)
Operating Temperature - Junction: Must support -65°C to 150°C range
RoHS Status: Must be ROHS3 Compliant for new designs

Secondary Considerations:

Reverse Leakage Current: Lower values indicate superior performance
Capacitance: Lower values preferred for high-frequency applications
Product Status: Active status preferred for long-term availability
Packaging Format: Tape & Reel (TR) or Cut Tape (CT) formats support different assembly workflows

Substitutes are grouped into three categories: Direct Equivalents (identical electrical specifications with packaging variations), Parametric Equivalents (higher current ratings with compatible electrical characteristics), and Manufacturer-Recommended Alternatives (different manufacturers or package formats meeting core requirements).

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	trr [ns]	Ir @ Vr [µA @ V]	Package	Status	RoHS
MMBD4448W-7-F	Diodes Incorporated	75	250	1.25 @ 150	4	1 @ 75	SOT-23-3	Active	ROHS3
MMBD4448-7-F	Diodes Incorporated	75	250	1.25 @ 150	4	2.5 @ 75	SOT-23-3	Active	ROHS3
BAL99-7-F	Diodes Incorporated	75	300	1.25 @ 150	4	2.5 @ 75	SOT-23-3	Active	ROHS3
BAL99-7	Diodes Incorporated	75	300	1.25 @ 150	4	2.5 @ 75	SOT-23-3	Discontinued	Non-compliant
BAS116LT1G	onsemi	75	200	1.25 @ 150	3000	0.005 @ 75	SOT-23-3	Active	ROHS3
MMBD4448-TP	Micro Commercial Co	75	250	1.25 @ 150	4	2.5 @ 75	SOT-23-3	Active	ROHS3
MMBD4448WT-TP	Micro Commercial Co	75	250	1.25 @ 150	4	2.5 @ 75	SOT-323	Active	ROHS3

Engineering Selection Recommendations

Direct Equivalent (Preferred for Drop-In Replacement):

MMBD4448-7-F (Diodes Incorporated) is the direct electrical equivalent available in Cut Tape & Digi-Reel packaging format. This part maintains identical voltage, current, and switching characteristics while offering higher inventory availability (55,839 units). Selection is appropriate when packaging format flexibility is acceptable and cost optimization is a secondary consideration.

Higher Current Rating Alternative:

BAL99-7-F (Diodes Incorporated) provides 300 mA average rectified current while maintaining 75 V reverse voltage and 4 ns reverse recovery time. This part is suitable for applications requiring design margin above the 250 mA specification. Active product status and ROHS3 compliance ensure long-term supply continuity. Inventory availability is significantly higher (17,420 units).

Cross-Manufacturer Option:

MMBD4448-TP (Micro Commercial Co) offers identical electrical specifications to the main part with active product status and ROHS3 compliance. This option provides supply chain diversification and maintains 250 mA current rating. Operating temperature range is -55°C to 150°C, which is narrower than the main part's -65°C to 150°C range.

Smaller Package Alternative:

MMBD4448WT-TP (Micro Commercial Co) uses SOT-323 package instead of SOT-23-3, providing a smaller footprint for space-constrained applications. Electrical specifications remain identical at 250 mA and 75 V. This part is suitable only when PCB layout permits the smaller package format.

Not Recommended for New Designs:

BAL99-7 (Diodes Incorporated) is discontinued at DiGi Electronics and does not meet ROHS3 compliance requirements. This part should not be selected for new product designs.

Limited Suitability:

BAS116LT1G (onsemi) has a lower average rectified current rating of 200 mA, which is below the 250 mA specification of the main part. Additionally, reverse recovery time is 3 µs, significantly longer than the 4 ns fast recovery specification. This part is suitable only for applications with reduced current requirements and where fast recovery is not critical.

Frequently Asked Questions (FAQ)

Q: Can MMBD4448-7-F be used as a direct replacement for MMBD4448W-7-F?

A: Yes. Both parts share identical electrical specifications: 75 V reverse voltage, 250 mA average rectified current, 1.25 V forward voltage at 150 mA, and 4 ns reverse recovery time. The primary difference is packaging format: MMBD4448-7-F is supplied in Cut Tape & Digi-Reel format, while MMBD4448W-7-F is supplied in Tape & Reel format. Both are ROHS3 compliant and actively produced.

Q: What is the difference between MMBD4448W-7-F and BAL99-7-F?

A: BAL99-7-F has a higher average rectified current rating of 300 mA compared to 250 mA for MMBD4448W-7-F. Both maintain 75 V reverse voltage, 1.25 V forward voltage at 150 mA, and 4 ns reverse recovery time. BAL99-7-F is suitable when the application requires higher current capacity or design margin. Reverse leakage current is 2.5 µA for BAL99-7-F versus 1 µA for MMBD4448W-7-F.

Q: Why is BAS116LT1G not recommended as a substitute?

A: BAS116LT1G has a maximum average rectified current of 200 mA, which is below the 250 mA requirement of MMBD4448W-7-F. Additionally, its reverse recovery time is 3 µs, which does not meet the fast recovery specification of ≤ 500 ns. This part is classified as small signal technology and is suitable only for lower-current applications.

Q: Can MMBD4448WT-TP replace MMBD4448W-7-F in existing designs?

A: MMBD4448WT-TP uses SOT-323 package instead of SOT-23-3, requiring PCB layout modification. Electrical specifications are identical: 75 V, 250 mA, 1.25 V forward voltage, and 4 ns reverse recovery time. This substitution is viable only when the smaller SOT-323 footprint is compatible with the PCB design and assembly process.

Q: What is the significance of the -7-F suffix in part numbers?

A: The -7-F suffix indicates the specific manufacturing code and packaging designation assigned by Diodes Incorporated. Parts with this suffix are supplied in Tape & Reel format. Equivalent parts from other manufacturers or packaging formats may use different suffix conventions (such as -TP for Micro Commercial Co).

Q: Are all listed substitutes ROHS3 compliant?

A: No. BAL99-7 is RoHS non-compliant and is discontinued at DiGi Electronics. All other listed substitutes, including MMBD4448-7-F, BAL99-7-F, BAS116LT1G, MMBD4448-TP, and MMBD4448WT-TP, are ROHS3 compliant and suitable for new product designs.

Q: What is the operating temperature range difference between MMBD4448W-7-F and MMBD4448-TP?

A: MMBD4448W-7-F operates from -65°C to 150°C junction temperature, while MMBD4448-TP operates from -55°C to 150°C. The main part has a 10°C lower minimum operating temperature. For applications requiring operation below -55°C, MMBD4448W-7-F or MMBD4448-7-F must be selected.

Q: How do reverse leakage current specifications affect part selection?

A: MMBD4448W-7-F has 1 µA reverse leakage at 75 V, while MMBD4448-7-F and BAL99-7-F have 2.5 µA. Lower reverse leakage indicates lower standby current consumption. For battery-powered or low-power applications, MMBD4448W-7-F is preferred. For general-purpose rectification, the difference is typically negligible.

Q: Can BAL99-7-F be used in applications designed for 250 mA operation?

A: Yes. BAL99-7-F is rated for 300 mA average rectified current, which exceeds the 250 mA requirement. All other electrical parameters match or exceed MMBD4448W-7-F specifications. This part provides design margin and is suitable for applications with potential current growth or thermal stress reduction.

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