MMSD4148T1 Equivalent & Substitute Parts Reference

Part Overview

The MMSD4148T1 is a small-signal switching 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. The MMSD4148T1 serves general-purpose switching and signal detection applications where fast switching characteristics and compact packaging are required.

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
Mounting Type	Surface Mount	—
Package / Case	SOD-123	—
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—
Product Status	Obsolete	—

Substitute Part Grouping Explanation

Substitution of the MMSD4148T1 is determined by strict adherence to the following electrical and mechanical 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
Reverse Recovery Time (trr): Must equal 4 ns
Mounting Type: Surface Mount
Package / Case: SOD-123 or compatible surface mount package

Substitution Categories:

Direct Equivalent (Identical Electrical and Package Specifications): Parts meeting all primary criteria with matching SOD-123 packaging and identical electrical performance.

Functional Equivalent (Enhanced Electrical Performance, Same Package): Parts exceeding the minimum current rating (Io > 200 mA) or voltage rating (Vr > 100 V) while maintaining SOD-123 packaging and 4 ns reverse recovery time. These parts are electrically superior and backward-compatible.

Compatible Substitute (Different Package, Equivalent Electrical Performance): Parts meeting electrical criteria but utilizing alternative surface mount packages (SOD-123F, SOT-23) due to manufacturing or availability constraints. Package compatibility must be verified for PCB layout.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If	trr [ns]	Package	Product Status	RoHS Compliance
MMSD4148T1	onsemi	100	200	1 V @ 10 mA	4	SOD-123	Obsolete	Non-compliant
MMSD4148T1G	onsemi	100	200	1 V @ 10 mA	4	SOD-123	Active	ROHS3 Compliant
1N4148W-13-F	Diodes Incorporated	100	300	1.25 V @ 150 mA	4	SOD-123	Active	ROHS3 Compliant
1N4148W-7-F	Diodes Incorporated	100	300	1.25 V @ 150 mA	4	SOD-123	Active	ROHS3 Compliant
1N4148W-E3-18	Vishay General Semiconductor	75	150	1.2 V @ 100 mA	4	SOD-123	Active	ROHS3 Compliant
1N4148W-TP	Micro Commercial Co	100	150	1.25 V @ 150 mA	4	SOD-123	Active	ROHS3 Compliant
BAS16H,115	NXP USA Inc.	100	215	1.25 V @ 150 mA	4	SOD-123F	Active	ROHS3 Compliant
SMBD914E6327HTSA1	Infineon Technologies	100	250	1.25 V @ 150 mA	4	SOT-23	Last Time Buy	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Recommended for New Designs):

MMSD4148T1G (onsemi) is the direct active equivalent of the obsolete MMSD4148T1. This part maintains identical electrical specifications (100 V, 200 mA, 4 ns trr) and SOD-123 packaging. MMSD4148T1G is ROHS3 compliant and carries active product status with substantial inventory availability (2,828,400 pcs). This part is the preferred substitution path for designs currently using MMSD4148T1.

Tier 2 - Functional Equivalents (Enhanced Performance, Same Package):

1N4148W-13-F and 1N4148W-7-F (Diodes Incorporated) both provide enhanced current rating (300 mA vs. 200 mA) while maintaining 100 V reverse voltage and 4 ns reverse recovery time in SOD-123 packaging. Both parts are ROHS3 compliant and active. These parts are suitable for applications requiring higher current margin or where design flexibility permits component upgrade.

Tier 3 - Conditional Substitutes (Reduced Specifications or Package Variation):

1N4148W-E3-18 (Vishay) operates at reduced voltage (75 V) and current (150 mA) ratings. This part is suitable only for applications where the circuit operates below 75 V reverse voltage and requires less than 150 mA current. ROHS3 compliant and active status.

1N4148W-TP (Micro Commercial Co) provides 100 V rating but reduced current (150 mA). Suitable for lower-current applications. ROHS3 compliant and active.

BAS16H,115 (NXP USA Inc.) meets electrical requirements (100 V, 215 mA, 4 ns trr) but uses SOD-123F packaging instead of SOD-123. PCB layout compatibility must be verified. ROHS3 compliant, active status, and automotive-qualified (AEC-Q101).

SMBD914E6327HTSA1 (Infineon Technologies) meets electrical requirements (100 V, 250 mA, 4 ns trr) but uses SOT-23 packaging. This represents a significant package change requiring PCB redesign. Product status is Last Time Buy. ROHS3 compliant.

Frequently Asked Questions (FAQ)

Q1: Can MMSD4148T1G be used as a direct replacement for MMSD4148T1?

A: Yes. MMSD4148T1G is the active equivalent of the obsolete MMSD4148T1. Both parts share identical electrical specifications (100 V reverse voltage, 200 mA average rectified current, 4 ns reverse recovery time) and SOD-123 packaging. MMSD4148T1G is ROHS3 compliant and recommended for all new designs and obsolescence mitigation.

Q2: What is the difference between SOD-123 and SOD-123F packaging?

A: SOD-123F is a variant of SOD-123 with different lead geometry and footprint. While both are surface mount packages, PCB layout and assembly tooling differ. BAS16H,115 uses SOD-123F packaging. Verify PCB compatibility before substitution.

Q3: Can I use 1N4148W-13-F or 1N4148W-7-F in place of MMSD4148T1?

A: Yes, with design verification. Both parts exceed the minimum specifications (300 mA vs. 200 mA current rating) while maintaining 100 V reverse voltage and 4 ns reverse recovery time in SOD-123 packaging. Higher current rating provides design margin but does not degrade performance in applications designed for 200 mA operation.

Q4: Why is 1N4148W-E3-18 listed as a substitute if it has lower voltage and current ratings?

A: 1N4148W-E3-18 is included for applications where circuit operating conditions are known to remain below 75 V reverse voltage and 150 mA current. It is not a universal substitute but serves specific lower-power applications. Verify circuit requirements before selection.

Q5: What does "Last Time Buy" status mean for SMBD914E6327HTSA1?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part. Existing inventory may be available, but future procurement is not guaranteed. This part should be avoided for new designs unless inventory is secured and long-term supply is confirmed.

Q6: Is RoHS compliance important for my application?

A: RoHS3 compliance is mandatory for products sold in the European Union and increasingly required by global OEMs. MMSD4148T1 is RoHS non-compliant (obsolete status). All active substitutes listed (MMSD4148T1G, 1N4148W series, BAS16H,115, SMBD914E6327HTSA1) are ROHS3 compliant.

Q7: Can SMBD914E6327HTSA1 replace MMSD4148T1 despite the different package?

A: Electrically, yes. SMBD914E6327HTSA1 meets voltage (100 V), current (250 mA), and speed (4 ns trr) requirements. However, it uses SOT-23 packaging instead of SOD-123, requiring PCB redesign. This substitution is not recommended unless PCB layout modification is acceptable and inventory is available (Last Time Buy status).

Q8: Which substitute offers the best long-term availability?

A: MMSD4148T1G (onsemi) offers the best long-term availability with 2,828,400 pcs in stock and active product status. This part is the recommended primary substitute for all applications.

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