MMSD4148 Equivalent & Substitute Parts

Part Overview

The MMSD4148 is a general-purpose rectifier diode manufactured by onsemi, rated for 100 V DC reverse voltage and 200 mA average rectified current in a surface mount SOD-123 package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design and procurement requirements. Active alternatives with identical or superior electrical characteristics are available from onsemi and other manufacturers.

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
Capacitance @ Vr, F	4	pF @ 0V, 1MHz
Package / Case	SOD-123	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

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

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 100 V
Current - Average Rectified (Io): Must equal or exceed 200 mA
Package / Case: Must be SOD-123 or compatible surface mount package
Reverse Recovery Time (trr): Must equal or be faster than 4 ns
Mounting Type: Must be Surface Mount

Substitution Categories:

Direct Equivalents (onsemi): Parts MMSD4148T1G, MMSD914T3G, SMMSD4148T1G, SMMSD914T3G, and SMMSD914T1G meet or exceed all electrical parameters and are manufactured by onsemi. These parts are active products with RoHS3 compliance and identical or superior specifications.

Parametric Equivalents: Part MMSD4448 from Fairchild Semiconductor meets all core electrical requirements with identical voltage, current, and recovery time specifications.

Similar Parts (Lower Current Rating): Parts 1N4148W-E3-18 and 1N4148W_R1_00001 have reduced current ratings (150 mA and 200 mA respectively) or reduced voltage ratings (75 V), making them suitable only for applications with lower current or voltage demands than the original specification.

Similar Parts (Different Package): Part BAS16H,115 uses SOD-123F package instead of SOD-123, with higher current capability (215 mA) and automotive qualification.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [V]	trr [ns]	Package	Product Status	RoHS Status
MMSD4148	onsemi	100	200	1.0 @ 10 mA	4	SOD-123	Obsolete	—
MMSD4148T1G	onsemi	100	200	1.0 @ 10 mA	4	SOD-123	Active	ROHS3 Compliant
MMSD914T3G	onsemi	100	200	1.0 @ 10 mA	4	SOD-123	Active	ROHS3 Compliant
SMMSD4148T1G	onsemi	100	200	1.0 @ 10 mA	4	SOD-123	Active	ROHS3 Compliant
SMMSD914T3G	onsemi	100	200	1.0 @ 10 mA	4	SOD-123	Active	ROHS3 Compliant
SMMSD914T1G	onsemi	100	200	1.0 @ 10 mA	4	SOD-123	Active	ROHS3 Compliant
MMSD4448	Fairchild Semiconductor	100	200	1.0 @ 100 mA	4	SOD-123	Active	—
1N4148W-E3-18	Vishay General Semiconductor	75	150	1.2 @ 100 mA	4	SOD-123	Active	ROHS3 Compliant
1N4148W-TP	Micro Commercial Co	100	150	1.25 @ 150 mA	4	SOD-123	Active	ROHS3 Compliant
1N4148W_R1_00001	Panjit International Inc.	75	200	1.25 @ 150 mA	4	SOD-123	Active	ROHS3 Compliant
BAS16H,115	NXP USA Inc.	100	215	1.25 @ 150 mA	4	SOD-123F	Active	—

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement:

MMSD4148T1G, MMSD914T3G, SMMSD4148T1G, SMMSD914T3G, and SMMSD914T1G are direct functional equivalents manufactured by onsemi. All five parts are active products with RoHS3 compliance and identical electrical specifications to the obsolete MMSD4148. These parts are suitable for direct substitution without circuit modification. SMMSD914T3G and SMMSD914T1G carry automotive qualification (AEC-Q101), making them appropriate for automotive applications.

Secondary Recommendation - Cross-Manufacturer Equivalent:

MMSD4448 from Fairchild Semiconductor meets all core electrical parameters (100 V, 200 mA, 4 ns recovery time) and is an active product. This part is suitable for applications where onsemi parts are unavailable.

Conditional Substitution - Reduced Current Rating:

1N4148W-TP from Micro Commercial Co maintains the 100 V reverse voltage specification but has a reduced current rating of 150 mA. This part is suitable only for applications where the circuit current requirement does not exceed 150 mA.

Not Recommended for Direct Substitution:

1N4148W-E3-18 and 1N4148W_R1_00001 have reduced reverse voltage ratings (75 V), making them unsuitable for circuits requiring the full 100 V specification. BAS16H,115 uses a different package variant (SOD-123F) and should be selected only when package compatibility is confirmed.

Frequently Asked Questions (FAQ)

Q: Can MMSD4148T1G be used as a direct replacement for MMSD4148?

A: Yes. MMSD4148T1G is an active product from onsemi with identical electrical specifications (100 V, 200 mA, 4 ns recovery time) and the same SOD-123 package. It is a direct functional equivalent.

Q: What is the difference between MMSD914T3G and SMMSD914T3G?

A: Both parts have identical electrical specifications and are manufactured by onsemi. SMMSD914T3G carries automotive qualification (AEC-Q101), making it suitable for automotive applications. MMSD914T3G is the standard industrial version.

Q: Can 1N4148W-TP replace MMSD4148 in all applications?

A: 1N4148W-TP has a reduced current rating of 150 mA compared to the MMSD4148 specification of 200 mA. It is suitable only for applications where the circuit current does not exceed 150 mA. The reverse voltage specification (100 V) is maintained.

Q: Why is BAS16H,115 listed as a similar part rather than a direct equivalent?

A: BAS16H,115 uses the SOD-123F package instead of SOD-123. While it exceeds the electrical specifications (215 mA current, 100 V voltage), the different package footprint requires board layout verification before substitution.

Q: Are all substitute parts RoHS3 compliant?

A: The onsemi parts (MMSD4148T1G, MMSD914T3G, SMMSD4148T1G, SMMSD914T3G, SMMSD914T1G), Micro Commercial Co part (1N4148W-TP), Vishay part (1N4148W-E3-18), and Panjit part (1N4148W_R1_00001) are RoHS3 compliant. MMSD4448 and BAS16H,115 do not list RoHS status in the provided specifications.

Q: What is the operating temperature range for substitute parts?

A: The original MMSD4148 specifies a maximum junction temperature of 150°C. Most active substitutes (MMSD4148T1G, MMSD914T3G, SMMSD4148T1G, SMMSD914T3G, SMMSD914T1G, 1N4148W-TP, 1N4148W_R1_00001) operate from -55°C to 150°C. 1N4148W-E3-18 operates from -55°C to 150°C. 1N4148W-TP operates from -65°C to 150°C.

Q: Can automotive-grade parts (SMMSD914T3G, SMMSD914T1G) be used in non-automotive applications?

A: Yes. Automotive-qualified parts meet or exceed industrial specifications and are suitable for any application. The AEC-Q101 qualification indicates additional testing and reliability requirements.

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