MMBD1501 Equivalent & Substitute Parts

Part Overview

The MMBD1501 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 part is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. The MMBD1501 serves applications requiring small-signal rectification, switching, and general-purpose diode functions in compact surface mount form factors.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	200	V
Current - Average Rectified (Io)	200	mA
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 200 mA	V
Current - Reverse Leakage @ Vr	10 nA @ 180 V	nA
Capacitance @ Vr, F	4 pF @ 0V, 1MHz	pF
Package / Case	TO-236-3, SC-59, SOT-23-3	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction (Max)	150	°C
Technology	Standard	—
Speed	Small Signal ≤ 200mA (Io), Any Speed	—

Substitute Part Grouping Explanation

Substitution of the MMBD1501 is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 200 V minimum
Current - Average Rectified (Io): 200 mA minimum
Package / Case: TO-236-3, SC-59, SOT-23-3
Mounting Type: Surface Mount
Technology: Standard

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: Up to 1.25 V @ 200 mA
Current - Reverse Leakage @ Vr: Up to 100 nA
Capacitance @ Vr, F: Up to 5 pF @ 0V, 1MHz
Operating Temperature - Junction: -55°C to 150°C range acceptable
Product Status: Active or Last Time Buy acceptable for obsolete part replacement

Substitute parts are classified into two categories:

Direct Equivalents: Parts meeting all mandatory parameters with identical or superior electrical characteristics and active product status.

Similar Substitutes: Parts meeting all mandatory parameters with minor variations in forward voltage, reverse leakage, or current rating that remain within acceptable application tolerances.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [mA]	Vf (Max) @ If [V]	Reverse Leakage @ Vr [nA]	Capacitance @ Vr [pF]	Package	Product Status	RoHS Status
MMBD1501	onsemi	200	200	1.1 @ 200 mA	10 @ 180 V	4 @ 0V, 1MHz	SOT-23-3	Obsolete	—
MMBD1501A	onsemi	200	200	1.1 @ 200 mA	10 @ 180 V	4 @ 0V, 1MHz	SOT-23-3	Active	ROHS3 Compliant
BAS20LT1G	onsemi	200	200	1.25 @ 200 mA	100 @ 150 V	5 @ 0V, 1MHz	SOT-23-3	Active	ROHS3 Compliant
BAS21-7-F	Diodes Incorporated	200	200	1.25 @ 200 mA	100 @ 200 V	5 @ 0V, 1MHz	SOT-23-3	Active	ROHS3 Compliant
BAS20-E3-08	Vishay General Semiconductor - Diodes Division	150	200	1.25 @ 200 mA	100 @ 150 V	5 @ 0V, 1MHz	SOT-23-3	Active	ROHS3 Compliant
BAS21E6327HTSA1	Infineon Technologies	200	250	1.25 @ 200 mA	100 @ 200 V	5 @ 0V, 1MHz	SOT-23-3	Last Time Buy	ROHS3 Compliant
MMBD1501-TP	Micro Commercial Co	180	200	1.3 @ 200 mA	10 @ 180 V	—	SOT-23-3	Active	ROHS3 Compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Equivalent:

MMBD1501A (onsemi) is the direct equivalent replacement for the obsolete MMBD1501. This part maintains identical electrical specifications including 200 V reverse voltage, 200 mA current rating, 1.1 V forward voltage, and 10 nA reverse leakage. The MMBD1501A carries Active product status and ROHS3 compliance, making it suitable for new designs and production continuity. Inventory availability is 56,100 pieces.

Secondary Recommendations - Full Parameter Equivalents:

BAS20LT1G (onsemi) and BAS21-7-F (Diodes Incorporated) both meet the 200 V / 200 mA specification with Active product status and ROHS3 compliance. These parts exhibit slightly elevated forward voltage (1.25 V) and reverse leakage (100 nA) compared to the MMBD1501, but remain within acceptable operating tolerances for general-purpose rectification applications. BAS20LT1G offers 125,200 pieces in inventory; BAS21-7-F offers 86,100 pieces.

Alternative for Voltage-Reduced Applications:

BAS20-E3-08 (Vishay) is suitable only for applications where 150 V reverse voltage rating is acceptable. This part does not meet the full 200 V specification of the MMBD1501 and should be selected only when circuit design permits reduced voltage operation.

Higher Current Capability Option:

BAS21E6327HTSA1 (Infineon) provides 250 mA current rating with 200 V reverse voltage, offering increased current margin. This part carries Last Time Buy status and should be evaluated for long-term availability. It is suitable for applications requiring higher current capacity within the same package footprint.

Reduced Voltage Alternative:

MMBD1501-TP (Micro Commercial Co) operates at 180 V reverse voltage with 200 mA current rating. This part is appropriate only for applications where 180 V reverse voltage meets circuit requirements. Forward voltage is elevated to 1.3 V compared to the original specification.

Frequently Asked Questions (FAQ)

Q: Can MMBD1501A be used as a direct replacement for MMBD1501?

A: Yes. MMBD1501A is the direct equivalent with identical electrical specifications (200 V, 200 mA, 1.1 V forward voltage, 10 nA reverse leakage) and maintains the same SOT-23-3 package. MMBD1501A carries Active product status and ROHS3 compliance, making it the primary replacement for the obsolete MMBD1501.

Q: What is the difference between MMBD1501 and BAS20LT1G?

A: Both parts share 200 V reverse voltage, 200 mA current rating, and SOT-23-3 packaging. BAS20LT1G exhibits 1.25 V forward voltage (versus 1.1 V) and 100 nA reverse leakage (versus 10 nA). These differences are acceptable for general-purpose rectification applications. BAS20LT1G is manufactured by onsemi and carries Active status with ROHS3 compliance.

Q: Can BAS20-E3-08 replace MMBD1501 in all applications?

A: No. BAS20-E3-08 is rated for 150 V reverse voltage, which is below the MMBD1501 specification of 200 V. This part is suitable only for applications where circuit design permits 150 V operation. All other electrical parameters and packaging are compatible.

Q: What is the significance of "Last Time Buy" status for BAS21E6327HTSA1?

A: Last Time Buy status indicates that Infineon has announced end-of-life for this part. While currently available (44,100 pieces in inventory), future availability is limited. This part should be selected only when its higher 250 mA current rating provides specific design advantage, and long-term supply is not critical.

Q: Are all substitute parts available in the same packaging?

A: Yes. All listed substitute parts use TO-236-3, SC-59, or SOT-23-3 package designations, which are mechanically and electrically equivalent. Surface mount assembly equipment and PCB footprints remain unchanged across all substitutes.

Q: What is the impact of forward voltage variation between MMBD1501 and substitute parts?

A: The MMBD1501 specifies 1.1 V forward voltage at 200 mA, while BAS20LT1G and BAS21-7-F specify 1.25 V. This 0.15 V difference results in approximately 7.5% additional voltage drop across the diode. For most general-purpose rectification applications, this variation is acceptable. Applications with tight voltage budget constraints should verify compatibility through circuit simulation or testing.

Q: Which substitute part offers the best inventory availability?

A: BAS20LT1G (onsemi) offers the highest inventory with 125,200 pieces in stock, followed by BAS21-7-F (Diodes Incorporated) with 86,100 pieces. MMBD1501A (onsemi) provides 56,100 pieces. All three parts carry Active product status and ROHS3 compliance.

Q: Can MMBD1501-TP be used as a cost-effective alternative?

A: MMBD1501-TP is suitable only for applications where 180 V reverse voltage meets circuit requirements. This part does not provide full 200 V rating and exhibits elevated forward voltage (1.3 V). Selection should be based on specific circuit voltage requirements rather than cost considerations alone.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message