MMBD4148 Equivalent & Substitute Parts

Part Overview

The MMBD4148 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, indicating that direct procurement from the original manufacturer may be limited or unavailable. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production requirements for applications utilizing this component.

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	TO-236-3, SC-59, SOT-23-3	—
Operating Temperature - Junction (Max)	150	°C
Technology	Standard	—
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitution of the MMBD4148 is determined by electrical and mechanical compatibility within the following criteria:

Primary Substitution Parameters:

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 SOT-23-3 (TO-236-3, SC-59) for direct mechanical compatibility
Mounting Type: Surface Mount
Technology: Standard rectifier diode technology

Secondary Compatibility Factors:

Reverse Recovery Time (trr): Acceptable range 3–50 ns for small-signal applications
Forward Voltage (Vf): Acceptable range 0.855–1.25 V @ specified current
Reverse Leakage Current: Acceptable range 25 nA–500 nA @ specified voltage
Operating Temperature Range: Must support minimum junction temperature of 150°C (Max)

Substitute parts are grouped into three categories:

Direct Equivalents (Same Package, Matching Specifications): Parts with identical or superior electrical ratings in SOT-23-3 packaging from active manufacturers.
Parametric Equivalents (Same Package, Comparable Performance): Parts with equivalent voltage and current ratings but minor variations in secondary parameters (forward voltage, leakage current, recovery time).
Alternative Configurations (Different Package): Parts with matching electrical specifications but different package types, suitable only when board layout permits redesign.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) [V]	trr [ns]	Package	Product Status	RoHS Status
MMBD4148	onsemi	100	200	1.0 @ 10 mA	4	SOT-23-3	Obsolete	—
BAS16LT1G	onsemi	100	200	1.25 @ 150 mA	6	SOT-23-3	Active	ROHS3 Compliant
BAS16LT3G	onsemi	100	200	1.25 @ 150 mA	6	SOT-23-3	Active	ROHS3 Compliant
MMBD1201	onsemi	100	200	1.0 @ 200 mA	4	SOT-23-3	Active	ROHS3 Compliant
MMBD4148 RFG	Taiwan Semiconductor Corporation	100	200	1.0 @ 10 mA	4	SOT-23-3	Active	ROHS3 Compliant
BAS19-E3-18	Vishay General Semiconductor - Diodes Division	100	200	1.25 @ 200 mA	50	SOT-23-3	Active	ROHS3 Compliant
MMBD4148,215	Nexperia USA Inc.	75	215	1.25 @ 150 mA	4	SOT-23-3	Active	ROHS3 Compliant
MMBD4148-7-F	Diodes Incorporated	75	300	1.25 @ 150 mA	4	SOT-23-3	Active	ROHS3 Compliant
MMBD4148-TP	Micro Commercial Co	100	150	0.855 @ 10 mA	4	SOT-23-3	Active	ROHS3 Compliant
MMBD4148_R1_00001	Panjit International Inc.	75	150	1.25 @ 150 mA	4	SOT-23-3	Active	ROHS3 Compliant
HN2D02FUTW1T1G	onsemi	80	100 (per diode)	1.2 @ 100 mA	3	SC-88/SOT-363	Active	ROHS3 Compliant

Engineering Selection Recommendations

Tier 1 – Direct Equivalents (Recommended for Drop-In Replacement):

MMBD4148 RFG (Taiwan Semiconductor Corporation): Identical electrical specifications to the original MMBD4148, matching 100 V reverse voltage, 200 mA current rating, 4 ns recovery time, and SOT-23-3 packaging. Active product status with ROHS3 compliance. Suitable for direct substitution without circuit modification.
MMBD1201 (onsemi): Matches all critical parameters (100 V, 200 mA, 4 ns trr, SOT-23-3). Active product status with ROHS3 compliance. Forward voltage specification at 200 mA provides improved performance margin. Recommended for new designs and production continuity.

Tier 2 – Parametric Equivalents (Compatible with Minor Performance Variation):

BAS16LT1G and BAS16LT3G (onsemi): Both rated 100 V, 200 mA in SOT-23-3 packaging. Forward voltage increases to 1.25 V @ 150 mA and recovery time extends to 6 ns. Active product status with ROHS3 compliance. Acceptable for applications where forward voltage drop and recovery time variations do not impact circuit performance.
BAS19-E3-18 (Vishay General Semiconductor - Diodes Division): Meets 100 V, 200 mA requirements in SOT-23-3 packaging. Recovery time of 50 ns indicates slower switching characteristics; suitable only for low-frequency rectification applications. Active product status with ROHS3 compliance.

Tier 3 – Reduced Voltage Rating (Conditional Use Only):

MMBD4148,215 (Nexperia USA Inc.): Reduced to 75 V reverse voltage with increased current rating (215 mA). Acceptable only in applications where circuit voltage does not exceed 75 V. Active product status with ROHS3 compliance.
MMBD4148-7-F (Diodes Incorporated): Reduced to 75 V reverse voltage with higher current capability (300 mA). Acceptable only in 75 V or lower voltage circuits. Active product status with ROHS3 compliance.
MMBD4148-TP (Micro Commercial Co): Maintains 100 V rating but reduced current to 150 mA. Acceptable only in applications where current demand does not exceed 150 mA. Active product status with ROHS3 compliance.
MMBD4148_R1_00001 (Panjit International Inc.): Reduced to 75 V reverse voltage and 150 mA current. Acceptable only in applications meeting both reduced voltage and current constraints. Active product status with ROHS3 compliance.

Tier 4 – Alternative Package Configuration (Redesign Required):

HN2D02FUTW1T1G (onsemi): Diode array configuration (3 independent diodes) in SC-88/SOT-363 package. Reduced voltage (80 V) and current per diode (100 mA). Suitable only for applications requiring multiple diodes and permitting PCB layout modification. Active product status with ROHS3 compliance.

Compliance and Certification:

All recommended substitute parts carry ROHS3 compliance and REACH Unaffected status, matching the regulatory requirements of the original MMBD4148. All parts are classified as Standard technology rectifier diodes suitable for general-purpose applications.

Frequently Asked Questions (FAQ)

Q1: Can I use BAS16LT1G as a direct replacement for MMBD4148?

A: BAS16LT1G is electrically compatible with MMBD4148 in terms of voltage (100 V) and current (200 mA) ratings and uses the same SOT-23-3 package. However, forward voltage increases from 1.0 V to 1.25 V, and recovery time extends from 4 ns to 6 ns. These differences are acceptable in most general-purpose rectification circuits but should be evaluated in applications sensitive to forward voltage drop or switching speed.

Q2: What is the difference between MMBD1201 and MMBD4148?

A: Both parts share identical voltage (100 V), current (200 mA), recovery time (4 ns), and package (SOT-23-3) specifications. MMBD1201 is an active product from onsemi with ROHS3 compliance, whereas MMBD4148 is obsolete. MMBD1201 is the recommended replacement for new designs and ongoing production.

Q3: Can I substitute MMBD4148 with MMBD4148,215?

A: MMBD4148,215 has reduced reverse voltage (75 V vs. 100 V) but increased current capability (215 mA vs. 200 mA). Substitution is acceptable only if the circuit operates at 75 V or lower. If the circuit requires 100 V rating, this part is not suitable.

Q4: Why is HN2D02FUTW1T1G listed as a substitute if it has a different package?

A: HN2D02FUTW1T1G is included as an alternative configuration option for applications that can accommodate a diode array in SC-88/SOT-363 packaging. It is not a direct replacement due to package differences and reduced per-diode ratings (80 V, 100 mA). Board redesign is required for implementation.

Q5: Are all substitute parts RoHS compliant?

A: All recommended substitute parts carry ROHS3 compliance certification. The original MMBD4148 does not specify RoHS status, but all active alternatives meet current RoHS3 requirements, ensuring regulatory compliance for new production.

Q6: Which substitute part has the lowest forward voltage drop?

A: MMBD4148-TP (Micro Commercial Co) specifies the lowest forward voltage at 0.855 mV @ 10 mA. However, this part has reduced current rating (150 mA vs. 200 mA). For applications requiring both 200 mA current and low forward voltage, MMBD4148 RFG or MMBD1201 are preferred, both rated at 1.0 V @ 10 mA.

Q7: Can I use BAS19-E3-18 in high-frequency switching applications?

A: BAS19-E3-18 has a recovery time of 50 ns, significantly slower than the original MMBD4148 (4 ns). This part is suitable only for low-frequency rectification and is not recommended for high-frequency switching applications where fast recovery is required.

Q8: What is the operating temperature range for substitute parts?

A: The original MMBD4148 specifies a maximum junction temperature of 150°C without a minimum range. Most substitute parts (BAS16LT1G, BAS16LT3G, BAS19-E3-18, MMBD4148 RFG, MMBD4148-7-F, MMBD4148-TP, MMBD4148_R1_00001) operate from −55°C to 150°C. MMBD1201 and MMBD4148,215 specify 150°C maximum only. Verify the required operating temperature range for your application.

Q9: Are there any inventory considerations when selecting a substitute?

A: Inventory levels vary significantly among substitute parts. MMBD1201 (62,300 pcs), BAS16LT1G (665,100 pcs), and MMBD4148-7-F (74,100 pcs) have substantial stock availability. BAS19-E3-18 has limited inventory (765 pcs). Verify current availability with your supplier before finalizing part selection.

Q10: What packaging options are available for MMBD4148 substitutes?

A: All recommended Tier 1 and Tier 2 substitutes use SOT-23-3 (TO-236-3, SC-59) packaging, matching the original MMBD4148. Packaging options include Cut Tape (CT) & Digi-Reel® and Tape & Reel (TR) formats. HN2D02FUTW1T1G uses SC-88/SOT-363 packaging and requires board redesign. Confirm packaging format compatibility with your assembly process.

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