MMBD1401 Equivalent & Substitute Parts

Part Overview

The MMBD1401 is a general-purpose rectifier diode manufactured by onsemi, rated for 200 V DC reverse voltage and 200 mA average rectified current in a surface mount SOT-23-3 package. This small-signal diode is designed for applications requiring efficient rectification at moderate voltage and current levels. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are necessary when the primary MMBD1401 becomes unavailable due to supply constraints, manufacturing discontinuation, or when alternative manufacturers' components meet the electrical and mechanical requirements of the application.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1	V @ 200 mA
Reverse Recovery Time (trr)	50	ns
Current - Reverse Leakage @ Vr	100	nA @ 175 V
Capacitance @ Vr, F	2	pF @ 0V, 1MHz
Package / Case	SOT-23-3	-
Operating Temperature - Junction (Max)	150	°C
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level (MSL)	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitute parts for the MMBD1401 are grouped based on the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 200 V
Current - Average Rectified (Io): Must equal or exceed 200 mA
Package / Case: Must be SOT-23-3 or equivalent surface mount package
Mounting Type: Must be surface mount
Operating Temperature - Junction: Must support 150°C maximum

Secondary Compatibility Parameters:

Reverse Recovery Time (trr): 50 ns or faster
Current - Reverse Leakage: 100 nA or lower at rated voltage
RoHS3 Compliance: Required for regulatory alignment
Moisture Sensitivity Level: MSL 1 preferred for handling consistency

Parts that meet all primary criteria are considered direct substitutes. Parts that exceed the primary electrical specifications (higher voltage or current ratings) are also acceptable substitutes provided they maintain the same package form factor and compliance certifications.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	trr [ns]	Ir @ Vr [nA]	Package	Product Status
MMBD1401	onsemi	200	200	1.0 @ 200 mA	50	100 @ 175 V	SOT-23-3	Active
BAS21-7-F	Diodes Incorporated	200	200	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Active
BAS21E6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	50	100 @ 200 V	SOT-23-3	Last Time Buy
BAS20-7-F	Diodes Incorporated	150	200	1.25 @ 200 mA	50	100 @ 150 V	SOT-23-3	Active
PMBD914,215	NXP Semiconductors	100	215	1.25 @ 150 mA	4	1 µA @ 75 V	SOT-23-3	Active
PMBD6050,215	NXP Semiconductors	70	215	1.25 @ 150 mA	4	100 nA @ 50 V	SOT-23-3	Active
PMBD6050,235	Nexperia USA Inc.	70	215	1.25 @ 150 mA	4	100 nA @ 50 V	SOT-23-3	Active

Engineering Selection Recommendations

Full Electrical Equivalents (Direct Substitutes):

BAS21-7-F (Diodes Incorporated) is the primary direct substitute for MMBD1401. This part matches the 200 V reverse voltage rating, 200 mA current rating, and SOT-23-3 package specification. The forward voltage is slightly higher at 1.25 V versus 1.0 V, which represents a minor performance difference acceptable in most rectification applications. BAS21-7-F maintains active production status and RoHS3 compliance with MSL 1 rating.

Higher Current Rated Equivalent:

BAS21E6327HTSA1 (Infineon Technologies) provides a 250 mA current rating while maintaining the 200 V voltage specification and SOT-23-3 package. This part is suitable for applications requiring additional current margin. However, this part carries a Last Time Buy product status, indicating limited future availability. Selection of this part should account for long-term supply planning.

Reduced Voltage Alternatives:

BAS20-7-F (Diodes Incorporated) is rated for 150 V reverse voltage with 200 mA current in SOT-23-3 package. This part is suitable only for applications where the circuit voltage does not exceed 150 V. The part maintains active production status and full compliance certifications.

Lower Voltage Rated Parts (Not Recommended for Direct Substitution):

PMBD914,215 (NXP Semiconductors) and PMBD6050,215 (NXP Semiconductors) are rated for 100 V and 70 V reverse voltage respectively. These parts do not meet the 200 V specification of MMBD1401 and are not suitable substitutes for applications requiring the full 200 V rating. These parts should be considered only when circuit design permits reduced voltage operation.

Compliance and Availability:

All recommended substitute parts maintain RoHS3 compliance and MSL 1 moisture sensitivity rating, ensuring compatibility with standard manufacturing and handling procedures. Inventory availability varies by part number, with BAS21-7-F offering the highest stock levels (86,100 pieces) among full electrical equivalents.

Frequently Asked Questions (FAQ)

Q: Can BAS21-7-F replace MMBD1401 in all applications?

A: BAS21-7-F is electrically compatible with MMBD1401 for applications operating at 200 V or below with 200 mA or less average rectified current. The forward voltage difference (1.25 V versus 1.0 V) is typically negligible in rectification circuits. Both parts use identical SOT-23-3 packaging and mounting methods. Verification of circuit performance should be performed for applications with tight voltage regulation requirements.

Q: What is the difference between BAS21-7-F and BAS20-7-F?

A: The primary difference is the maximum reverse voltage rating. BAS21-7-F is rated for 200 V while BAS20-7-F is rated for 150 V. Both parts carry 200 mA current ratings and use SOT-23-3 packaging. BAS20-7-F is suitable only for circuits operating at 150 V or below. Selection depends on the maximum reverse voltage present in the application circuit.

Q: Why are PMBD6050 and PMBD914 listed as substitutes if they have lower voltage ratings?

A: These parts are listed in the provided substitute list but do not meet the 200 V voltage requirement of MMBD1401. They are included for reference only and are not recommended as direct substitutes for applications requiring 200 V operation. These parts are suitable only for lower voltage applications (70 V and 100 V respectively).

Q: Is BAS21E6327HTSA1 a suitable long-term substitute?

A: BAS21E6327HTSA1 provides full electrical compatibility with higher current margin (250 mA versus 200 mA). However, this part carries Last Time Buy status, indicating that production will be discontinued. For new designs or long-term applications, BAS21-7-F is the preferred substitute due to its active production status and unlimited availability horizon.

Q: Are there any package differences between MMBD1401 and its substitutes?

A: All recommended substitute parts use SOT-23-3 or equivalent surface mount packages (SOT-23-3 Flat Leads, PG-SOT23, TO-236AB). These packages are mechanically and electrically compatible for PCB assembly. Supplier device package designations may vary by manufacturer, but the physical form factor and pin configuration remain consistent across all listed substitutes.

Q: What compliance certifications should I verify when selecting a substitute?

A: All recommended substitute parts maintain RoHS3 compliance and MSL 1 moisture sensitivity rating, matching the MMBD1401 specifications. These certifications ensure compatibility with standard manufacturing processes and handling procedures. REACH compliance status is consistent across all parts listed.

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