MMSD4148-D87Z Equivalent & Substitute Parts

Part Overview

The MMSD4148-D87Z is a general-purpose surface mount diode manufactured by onsemi, rated for 100 V DC reverse voltage and 200 mA average rectified current in a SOD-123 package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design requirements and production continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts provide functional alternatives within acceptable parameter tolerances for the application.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	100	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1 V @ 10 mA	V
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	µA
Capacitance @ Vr, F	4 pF @ 0V, 1MHz	pF
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the MMSD4148-D87Z is determined by the following critical parameters:

Electrical Compatibility Criteria:

Voltage - DC Reverse (Vr) must equal or exceed 100 V
Current - Average Rectified (Io) must equal or exceed 200 mA
Reverse Recovery Time (trr) must equal or be less than 4 ns
Package / Case must be SOD-123
Mounting Type must be Surface Mount

Substitute Categories:

Direct Equivalents (Identical Electrical Specifications): Parts meeting all electrical parameters with identical or superior ratings. These include MMSD4148T3G, MMSD914T3G, SMMSD4148T1G, and SMMSD914T3G from onsemi, all rated 100 V / 200 mA with 4 ns recovery time.

Parametric Equivalents (Functionally Compatible): Parts with matching or superior voltage and current ratings but minor variations in secondary parameters. MMSD4448 from Fairchild Semiconductor meets voltage and current requirements with identical recovery time, though capacitance differs (2 pF vs. 4 pF).

Similar Parts (Acceptable Substitutes with Parameter Variations): Parts with matching voltage rating but higher current capacity or different recovery characteristics. BAV16W-7-F and BAV19W-7-F from Diodes Incorporated provide 100 V rating with higher current ratings (300 mA and 400 mA respectively) and are suitable where increased current margin is acceptable. 1N4148W-E3-18 from Vishay operates at reduced voltage (75 V) and current (150 mA) and is suitable only for applications with lower voltage and current requirements.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [µA]	C @ Vr [pF]	Package	Product Status	Packaging Type
MMSD4148-D87Z	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	4 @ 0V, 1MHz	SOD-123	Obsolete	—
MMSD4148T3G	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	4 @ 0V, 1MHz	SOD-123	Active	Tape & Reel (TR)
MMSD914T3G	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	4 @ 0V, 1MHz	SOD-123	Active	Tape & Reel (TR)
SMMSD4148T1G	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	4 @ 0V, 1MHz	SOD-123	Active	Cut Tape (CT) & Digi-Reel®
SMMSD914T3G	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	4 @ 0V, 1MHz	SOD-123	Active	Tape & Reel (TR)
SMMSD914T1G	onsemi	100	200	1 @ 10 mA	4	5 @ 75 V	4 @ 0V, 1MHz	SOD-123	Active	Tape & Reel (TR)
MMSD4448	Fairchild Semiconductor	100	200	1 @ 100 mA	4	5 @ 75 V	2 @ 0V, 1MHz	SOD-123	Active	Bulk
BAV16W-7-F	Diodes Incorporated	100	300	1.25 @ 150 mA	4	1 @ 100 V	2 @ 0V, 1MHz	SOD-123	Active	Cut Tape (CT) & Digi-Reel®
BAV19W-7-F	Diodes Incorporated	100	400	1.25 @ 200 mA	50	100 nA @ 100 V	5 @ 0V, 1MHz	SOD-123	Active	Cut Tape (CT) & Digi-Reel®
1N4148W-E3-18	Vishay General Semiconductor - Diodes Division	75	150	1.2 @ 100 mA	4	100 µA @ 100 V	4 @ 0V, 1MHz	SOD-123	Active	Cut Tape (CT) & Digi-Reel®

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalents:

For applications requiring exact electrical and mechanical compatibility with the obsolete MMSD4148-D87Z, the following active onsemi parts provide identical specifications:

MMSD4148T3G: Active status, Tape & Reel packaging, 95,300 units in stock, ROHS3 compliant
MMSD914T3G: Active status, Tape & Reel packaging, 10,400 units in stock, ROHS3 compliant
SMMSD4148T1G: Active status, Cut Tape & Digi-Reel® packaging, 36,300 units in stock, ROHS3 compliant
SMMSD914T3G: Active status, Tape & Reel packaging, AEC-Q101 automotive qualified, 15,120 units in stock, ROHS3 compliant
SMMSD914T1G: Active status, Tape & Reel packaging, AEC-Q101 automotive qualified, 21,100 units in stock, ROHS3 compliant

Selection among these direct equivalents depends on packaging requirements (Tape & Reel vs. Cut Tape & Digi-Reel®) and automotive qualification needs. SMMSD914T3G and SMMSD914T1G are suitable for automotive applications requiring AEC-Q101 qualification.

Secondary Recommendation - Parametric Equivalent:

MMSD4448 (Fairchild Semiconductor): Meets voltage and current specifications with identical recovery time. Forward voltage specification differs (1 V @ 100 mA vs. 1 V @ 10 mA). Suitable for general-purpose applications where forward voltage measurement conditions are not critical. Limited inventory (1,145 units).

Tertiary Recommendation - Higher Current Capacity Substitutes:

BAV16W-7-F (Diodes Incorporated): 100 V / 300 mA rating provides 50% current margin above the original specification. Suitable for applications where increased current capacity is beneficial. ROHS3 compliant, 155,400 units in stock.
BAV19W-7-F (Diodes Incorporated): 100 V / 400 mA rating provides 100% current margin. Recovery time is 50 ns (vs. 4 ns original), which may affect high-frequency switching performance. Suitable only for low-frequency or DC applications.

Not Recommended for Direct Substitution:

1N4148W-E3-18 (Vishay): Reduced voltage rating (75 V vs. 100 V) and reduced current rating (150 mA vs. 200 mA). Suitable only for applications with lower voltage and current requirements than the original design.

Frequently Asked Questions (FAQ)

Q: Can MMSD4148T3G be used as a direct replacement for MMSD4148-D87Z?

A: Yes. MMSD4148T3G is electrically and mechanically identical to MMSD4148-D87Z. Both are rated 100 V / 200 mA with 4 ns recovery time in SOD-123 package. The primary difference is product status (Active vs. Obsolete) and packaging format (Tape & Reel vs. unspecified). MMSD4148T3G is ROHS3 compliant.

Q: What is the difference between MMSD914T3G and MMSD4148T3G?

A: Both parts are electrically identical (100 V / 200 mA, 4 ns recovery time, SOD-123 package). The difference is in the base product number designation (MMSD914 vs. MMSD4148). Both are manufactured by onsemi and are active products. Selection between them depends on design documentation and supplier availability.

Q: Are SMMSD914T3G and SMMSD914T1G interchangeable?

A: Yes, electrically and mechanically. Both are rated 100 V / 200 mA with 4 ns recovery time in SOD-123 package, manufactured by onsemi, and AEC-Q101 automotive qualified. The difference is packaging format: SMMSD914T3G is Tape & Reel, while SMMSD914T1G is also Tape & Reel. Both are suitable for automotive applications.

Q: Can BAV16W-7-F replace MMSD4148-D87Z?

A: BAV16W-7-F is functionally compatible for voltage rating (100 V) but has higher current capacity (300 mA vs. 200 mA). It is suitable as a substitute where increased current margin is acceptable. Recovery time is identical (4 ns). Forward voltage specification differs (1.25 V @ 150 mA vs. 1 V @ 10 mA), which may affect circuit performance in voltage-sensitive applications.

Q: Why is BAV19W-7-F not recommended as a direct substitute?

A: While BAV19W-7-F meets the 100 V voltage requirement and exceeds current capacity (400 mA), its reverse recovery time is 50 ns compared to 4 ns for the original part. This 12.5× increase in recovery time makes it unsuitable for high-frequency switching applications. It is suitable only for low-frequency or DC rectification circuits.

Q: What does ROHS3 compliance mean for this diode?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive 3 requirements, restricting the use of specific hazardous materials including lead, mercury, cadmium, and certain flame retardants. All active substitute parts listed are ROHS3 compliant.

Q: What is AEC-Q101 qualification?

A: AEC-Q101 is an automotive electronics qualification standard. Parts meeting this qualification have undergone additional testing and reliability screening for automotive applications. SMMSD914T3G and SMMSD914T1G carry this qualification, making them suitable for automotive designs requiring qualified components.

Q: Does packaging format (Tape & Reel vs. Cut Tape & Digi-Reel®) affect electrical performance?

A: No. Packaging format affects only handling, storage, and assembly processes. Electrical and mechanical specifications remain identical regardless of packaging format. Selection depends on manufacturing equipment compatibility and supply chain requirements.

Q: Is 1N4148W-E3-18 suitable for replacing MMSD4148-D87Z?

A: No. 1N4148W-E3-18 has reduced voltage rating (75 V vs. 100 V) and reduced current rating (150 mA vs. 200 mA). It is suitable only for applications with lower voltage and current requirements than the original design. Using it in a circuit designed for 100 V / 200 mA would result in inadequate voltage margin and potential component failure.

Q: What inventory levels should be considered when selecting a substitute?

A: Inventory levels are provided for reference. MMSD4148T3G (95,300 units), SMMSD4148T1G (36,300 units), and BAV16W-7-F (155,400 units) have substantial inventory. MMSD914T3G (10,400 units) and SMMSD914T3G (15,120 units) have moderate inventory. MMSD4448 (1,145 units) has limited inventory. Selection should balance electrical requirements with supply availability.

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