MMBD4148-D87Z Equivalent & Substitute Parts

Part Overview

The MMBD4148-D87Z 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 SOT-23-3 package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. Equivalent parts maintain identical electrical and mechanical specifications, while substitute parts satisfy the same functional requirements within defined parameter tolerances.

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 @ mA
Reverse Recovery Time (trr)	4	ns
Current - Reverse Leakage @ Vr	5 µA @ 75 V	µA @ V
Capacitance @ Vr, F	4 pF @ 0V, 1MHz	pF @ V, MHz
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
Technology	Standard	—

Substitute Part Grouping Explanation

Substitution of the MMBD4148-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 4 ns
Package / Case must be TO-236-3, SC-59, or SOT-23-3

Mechanical Compatibility Criteria:

Mounting Type must be Surface Mount
Supplier Device Package must accommodate SOT-23-3 footprint

Substitute parts are grouped into two categories:

Direct Equivalents (Identical Specifications): Parts that match all electrical parameters and package specifications of the MMBD4148-D87Z, differing only in product status (active vs. obsolete) or packaging format (Cut Tape vs. Tape & Reel).

Parametric Equivalents (Functional Substitutes): Parts that meet or exceed the minimum electrical requirements but may differ in secondary parameters such as forward voltage, reverse leakage current, or capacitance, provided they maintain the same package and mounting type.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If	trr [ns]	Ir @ Vr	Package	Product Status
MMBD4148-D87Z	onsemi	100	200	1 V @ 10 mA	4	5 µA @ 75 V	SOT-23-3	Obsolete
MMBD914LT1G	onsemi	100	200	1 V @ 10 mA	4	5 µA @ 75 V	SOT-23-3	Active
MMBD914LT3G	onsemi	100	200	1 V @ 10 mA	4	5 µA @ 75 V	SOT-23-3	Active
SMMBD914LT1G	onsemi	100	200	1 V @ 10 mA	4	5 µA @ 75 V	SOT-23-3	Active
SMMBD914LT3G	onsemi	100	200	1 V @ 10 mA	4	5 µA @ 75 V	SOT-23-3	Active
MMBD1201	onsemi	100	200	1 V @ 200 mA	4	50 nA @ 50 V	SOT-23-3	Active
BAS16E6327HTSA1	Infineon Technologies	80	250	1.25 V @ 150 mA	4	1 µA @ 75 V	SOT-23-3	Last Time Buy
BAS16E6433HTMA1	Infineon Technologies	80	250	1.25 V @ 150 mA	4	1 µA @ 75 V	SOT-23-3	Last Time Buy
BAS19-E3-18	Vishay General Semiconductor - Diodes Division	100	200	1.25 V @ 200 mA	50	100 nA @ 100 V	SOT-23-3	Active
MMBD4148-7-F	Diodes Incorporated	75	300	1.25 V @ 150 mA	4	1 µA @ 75 V	SOT-23-3	Active
MMBD4148-TP	Micro Commercial Co	100	150	855 mV @ 10 mA	4	25 nA @ 20 V	SOT-23-3	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The MMBD914LT1G, MMBD914LT3G, SMMBD914LT1G, and SMMBD914LT3G are direct electrical and mechanical equivalents to the MMBD4148-D87Z. All four parts are manufactured by onsemi, maintain identical voltage, current, and recovery time specifications, and are housed in the SOT-23-3 package. The primary distinction among these parts is packaging format: MMBD914LT1G is supplied in Cut Tape (CT) & Digi-Reel® format with 324,662 units in stock; MMBD914LT3G is supplied in Tape & Reel (TR) format with 55,400 units in stock. SMMBD914LT1G and SMMBD914LT3G are also supplied in Tape & Reel format with 17,400 and 10,400 units respectively. All four parts carry Active product status and ROHS3 compliance, providing long-term availability and regulatory alignment.

Secondary Substitutes (Parametric Equivalents):

The MMBD1201 is a parametric equivalent manufactured by onsemi with identical voltage and current ratings. This part exhibits superior reverse leakage characteristics (50 nA @ 50 V versus 5 µA @ 75 V) and lower capacitance (2 pF versus 4 pF), making it suitable for applications requiring reduced leakage or lower parasitic capacitance. The MMBD1201 is Active status with 62,300 units in stock.

The BAS19-E3-18 manufactured by Vishay General Semiconductor maintains the 100 V voltage rating and 200 mA current rating. However, this part exhibits a longer reverse recovery time (50 ns versus 4 ns) and higher forward voltage (1.25 V @ 200 mA versus 1 V @ 10 mA), making it suitable only for applications where these parameter variations are acceptable.

Not Recommended for Direct Substitution:

The BAS16E6327HTSA1 and BAS16E6433HTMA1 (Infineon Technologies) have reduced voltage ratings (80 V versus 100 V) and are classified as Last Time Buy, indicating discontinued product lines. The MMBD4148-7-F (Diodes Incorporated) has a reduced voltage rating (75 V versus 100 V). The MMBD4148-TP (Micro Commercial Co) has a reduced current rating (150 mA versus 200 mA). These parts do not meet the minimum electrical requirements of the MMBD4148-D87Z.

Frequently Asked Questions (FAQ)

Q: Can MMBD914LT1G replace MMBD4148-D87Z in all applications?

A: Yes. The MMBD914LT1G is a direct electrical and mechanical equivalent with identical voltage (100 V), current (200 mA), recovery time (4 ns), and package specifications (SOT-23-3). The primary difference is product status: MMBD914LT1G is Active while MMBD4148-D87Z is Obsolete. Both parts are manufactured by onsemi and carry identical compliance certifications.

Q: What is the difference between MMBD914LT1G and MMBD914LT3G?

A: Both parts are electrically identical. The difference is packaging format: MMBD914LT1G is supplied in Cut Tape (CT) & Digi-Reel® format, while MMBD914LT3G is supplied in Tape & Reel (TR) format. Selection depends on assembly process requirements and procurement volume.

Q: Why are SMMBD914LT1G and SMMBD914LT3G listed as substitutes?

A: These parts are electrically and mechanically identical to the MMBD914 variants. The "S" prefix indicates a different product line designation from onsemi. All electrical parameters, package specifications, and compliance certifications are identical. These parts are suitable for direct substitution.

Q: Can MMBD1201 replace MMBD4148-D87Z?

A: The MMBD1201 is a parametric equivalent with identical voltage and current ratings and the same SOT-23-3 package. However, it exhibits different secondary characteristics: lower reverse leakage (50 nA @ 50 V versus 5 µA @ 75 V) and lower capacitance (2 pF versus 4 pF). Substitution is acceptable for applications where these parameter differences do not affect circuit performance.

Q: Why are BAS16 and BAS19 parts listed but not recommended?

A: The BAS16E6327HTSA1 and BAS16E6433HTMA1 have reduced voltage ratings (80 V versus 100 V) and Last Time Buy status. The BAS19-E3-18 has a significantly longer recovery time (50 ns versus 4 ns) and higher forward voltage. These parts do not meet the electrical requirements of the MMBD4148-D87Z and are not suitable for direct substitution.

Q: What does "Last Time Buy" status mean for BAS16 parts?

A: Last Time Buy indicates that the manufacturer has discontinued the product line and will no longer accept new orders after a specified date. These parts should not be selected for new designs requiring long-term availability.

Q: Are all substitute parts RoHS3 compliant?

A: All Active and Last Time Buy substitute parts listed carry ROHS3 compliance certification. The original MMBD4148-D87Z does not specify RoHS status. For applications requiring RoHS compliance, select from the Active status parts: MMBD914LT1G, MMBD914LT3G, SMMBD914LT1G, SMMBD914LT3G, MMBD1201, or BAS19-E3-18.

Q: Can I use MMBD4148-7-F as a substitute?

A: No. The MMBD4148-7-F has a reduced voltage rating (75 V versus 100 V), which does not meet the minimum electrical requirements of the MMBD4148-D87Z. This part is not suitable for direct substitution.

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

A: The MMBD4148-D87Z specifies a maximum junction temperature of 150°C without a minimum. Most Active substitute parts (MMBD914LT1G, MMBD914LT3G, SMMBD914LT1G, SMMBD914LT3G, BAS19-E3-18) specify an operating range of -55°C to 150°C. The MMBD1201 specifies a maximum of 150°C. Verify operating temperature requirements for your specific application.

Q: Are all parts available in the same package?

A: Yes. All substitute parts are housed in the TO-236-3, SC-59, or SOT-23-3 package designation, which are equivalent surface mount packages. All parts are compatible with the same PCB footprint and assembly process.

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