MMBD4448 Equivalent & Substitute Parts

Part Overview

The MMBD4448 is a general-purpose rectifier diode manufactured by onsemi, rated for 75 V DC reverse voltage and 200 mA average rectified current in a surface-mount SOT-23-3 package. This component is classified as obsolete, indicating that direct replacements from the original manufacturer are no longer in active production. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this diode specification.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	75	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 100 mA	V @ mA
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	µA @ V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction	-55 to 150	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the MMBD4448 is determined by the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 75 V
Current - Average Rectified (Io): Must equal or exceed 200 mA
Package / Case: Must be SOT-23-3 (TO-236-3, SC-59) or compatible surface-mount package
Mounting Type: Surface Mount
Operating Temperature Range: Must encompass -55°C to 150°C or be compatible with application requirements

Secondary Compatibility Factors:

Reverse Recovery Time (trr): 4 ns baseline; parts with equal or faster recovery times are acceptable
Forward Voltage (Vf): Variations within 1 V @ 100 mA are acceptable for general-purpose applications
Reverse Leakage Current: Variations acceptable within standard small-signal diode specifications
RoHS and REACH Compliance: All substitutes must maintain ROHS3 compliance and REACH unaffected status

Substitute parts are grouped into two categories:

Direct Electrical Equivalents (100 V rated): Parts with higher voltage ratings (100 V) that maintain identical or superior current handling and package compatibility. These provide enhanced voltage margin while maintaining functional equivalence.
Functional Equivalents (75 V rated): Parts with matching 75 V voltage ratings and equal or superior current ratings in compatible packages, offering direct replacement capability.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V @ mA]	trr [ns]	Package	Product Status
MMBD4448	onsemi	75	200	1 @ 100	4	SOT-23-3	Obsolete
BAS16LT1G	onsemi	100	200	1.25 @ 150	6	SOT-23-3	Active
MMBD914LT1G	onsemi	100	200	1 @ 10	4	SOT-23-3	Active
MMBD914LT3G	onsemi	100	200	1 @ 10	4	SOT-23-3	Active
BAS16-7-F	Diodes Incorporated	75	300	1.25 @ 150	4	SOT-23-3	Active
BAS16W-7-F	Diodes Incorporated	75	150	1.25 @ 150	4	SOT-323	Active
CMPD4448 BK PBFREE	Central Semiconductor Corp	75	250	1 @ 100	4	SOT-23-3	Active
CMPD4448 TR PBFREE	Central Semiconductor Corp	75	250	1 @ 100	4	SOT-23-3	Active
CMPD914 BK PBFREE	Central Semiconductor Corp	75	250	1 @ 10	4	SOT-23-3	Active
CMPD914 TR PBFREE	Central Semiconductor Corp	75	250	1 @ 10	4	SOT-23-3	Active
CMPD914E TR PBFREE	Central Semiconductor Corp	75	250	0.97 @ 100	4	SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitutes (Recommended for Direct Replacement):

The MMBD914LT1G and MMBD914LT3G from onsemi are the preferred substitutes. Both parts maintain active product status, offer 100 V reverse voltage rating (providing enhanced voltage margin over the original 75 V specification), support 200 mA average rectified current, and are packaged in SOT-23-3. These parts are ROHS3 compliant and REACH unaffected, matching the compliance profile of the original component. The MMBD914LT3G is supplied in Tape & Reel packaging, while MMBD914LT1G is available in Cut Tape & Digi-Reel format.

Secondary Substitutes (Functional Equivalents):

The CMPD4448 series (BK PBFREE and TR PBFREE variants) from Central Semiconductor Corp provides functional equivalence with identical 75 V voltage rating and superior 250 mA current rating. Both variants maintain SOT-23-3 package compatibility, 4 ns reverse recovery time, and full compliance certifications. The TR (Tape & Reel) variant is preferred for high-volume production environments.

The BAS16-7-F from Diodes Incorporated offers 75 V rating with enhanced 300 mA current capacity in SOT-23-3 package, providing additional design margin for current-sensitive applications.

Alternative Consideration:

The BAS16LT1G from onsemi provides 100 V rating with 200 mA current in SOT-23-3 package. This part is suitable where voltage margin is prioritized, though forward voltage specification (1.25 V @ 150 mA) differs from the original.

Package Constraint:

The BAS16W-7-F from Diodes Incorporated uses SOT-323 package (smaller footprint) rather than SOT-23-3. This part is suitable only for designs where PCB layout accommodates SOT-323 dimensions and where 150 mA current rating is sufficient.

Frequently Asked Questions (FAQ)

Q: Can I use a 100 V rated diode as a substitute for the 75 V MMBD4448?

A: Yes. Parts rated for 100 V reverse voltage (such as MMBD914LT1G or MMBD914LT3G) are acceptable substitutes. The higher voltage rating provides additional design margin and does not compromise functionality in circuits designed for 75 V operation. All electrical and thermal characteristics remain compatible.

Q: What is the difference between MMBD914LT1G and MMBD914LT3G?

A: Both parts are electrically identical with 100 V rating and 200 mA current capacity in SOT-23-3 package. The primary difference is packaging format: MMBD914LT1G is supplied in Cut Tape & Digi-Reel format, while MMBD914LT3G is supplied in Tape & Reel format. Selection depends on production volume and handling requirements.

Q: Are CMPD4448 and CMPD914 variants interchangeable?

A: CMPD4448 and CMPD914 variants from Central Semiconductor Corp are not directly interchangeable. CMPD4448 is specified for 1 V forward voltage @ 100 mA, while CMPD914 is specified for 1 V forward voltage @ 10 mA. Selection depends on circuit operating point and forward voltage requirements at specific current levels.

Q: Can I substitute BAS16W-7-F for MMBD4448?

A: BAS16W-7-F is not recommended as a direct substitute. While it maintains 75 V voltage rating and 4 ns recovery time, it uses SOT-323 package (smaller than SOT-23-3) and is rated for only 150 mA average rectified current, below the 200 mA requirement. Substitution is only viable if PCB layout accommodates SOT-323 footprint and circuit current requirements do not exceed 150 mA.

Q: What does "PBFREE" designation mean in part numbers?

A: PBFREE indicates lead-free construction, compliant with RoHS directives. All CMPD variants with PBFREE designation maintain ROHS3 compliance and are suitable for applications requiring lead-free components.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and REACH unaffected status, matching the regulatory profile of the original MMBD4448 component.

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

A: Reverse recovery time indicates how quickly the diode transitions from conducting to blocking state. The MMBD4448 specifies 4 ns. Substitute parts with equal or faster recovery times (4 ns or less) are acceptable. Slower recovery times may introduce switching delays in high-frequency applications.

Q: Can I use CMPD914E TR PBFREE instead of CMPD914 TR PBFREE?

A: CMPD914E TR PBFREE differs in forward voltage specification (0.97 V @ 100 mA versus 1 V @ 10 mA) and reverse leakage current (100 µA @ 150 V versus 25 nA @ 20 V). Selection depends on circuit sensitivity to forward voltage drop and leakage current characteristics at operating conditions.

Q: What inventory considerations apply to substitute selection?

A: Inventory availability varies significantly among substitutes. MMBD914LT1G and MMBD914LT3G from onsemi offer substantial stock (324,662 and 55,400 units respectively). CMPD914 TR PBFREE from Central Semiconductor Corp provides 99,546 units. Selection should consider both technical compatibility and supply chain availability for production timelines.

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