M1MA151KT1 Equivalent & Substitute Parts

Part Overview

The M1MA151KT1 is a general-purpose rectifier diode rated for 40 V DC reverse voltage and 100 mA average rectified current in a surface mount SC-59 (SOT-23-3) package. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and procurement needs. Active alternatives with identical or enhanced electrical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	40	V
Current - Average Rectified (Io)	100	mA
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	V
Reverse Recovery Time (trr)	3	ns
Current - Reverse Leakage @ Vr	100 nA @ 35 V	nA
Capacitance @ Vr, F	2 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 M1MA151KT1 is determined by the following critical parameters:

Electrical Compatibility Requirements:

Voltage - DC Reverse (Vr) must equal or exceed 40 V
Current - Average Rectified (Io) must equal or exceed 100 mA
Voltage - Forward (Vf) characteristics must be compatible with circuit design
Reverse Recovery Time (trr) must support circuit switching requirements
Operating Temperature - Junction must support thermal environment

Mechanical Compatibility Requirements:

Mounting Type: Surface Mount
Package / Case: TO-236-3, SC-59, SOT-23-3 footprint compatibility

Compliance Requirements:

RoHS Status: Active alternatives must meet current regulatory standards
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are classified into two categories:

Direct Equivalent: Identical electrical specifications and packaging with active product status and current compliance certifications.

Similar Substitute: Enhanced electrical ratings (higher voltage or current capacity) within the same package family, suitable for applications where the original specifications are met or exceeded.

Parameter Comparison

Parameter	M1MA151KT1 (Main)	M1MA151KT1G (Direct)	BAL74,215 (Similar)	DAN202KT146 (Similar)
Manufacturer	onsemi	onsemi	Nexperia USA Inc.	Rohm Semiconductor
Product Status	Obsolete	Active	Active	Active
Voltage - DC Reverse (Vr) (Max)	40 V	40 V	50 V	80 V
Current - Average Rectified (Io)	100 mA	100 mA	215 mA	100 mA (per Diode)
Voltage - Forward (Vf) (Max) @ If	1.2 V @ 100 mA	1.2 V @ 100 mA	1.25 V @ 150 mA	1.2 V @ 100 mA
Reverse Recovery Time (trr)	3 ns	3 ns	4 ns	4 ns
Current - Reverse Leakage @ Vr	100 nA @ 35 V	100 nA @ 35 V	100 nA @ 50 V	100 nA @ 70 V
Capacitance @ Vr, F	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	2 pF @ 0V, 1MHz	Not specified
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	SC-59	SC-59	TO-236AB	SMD3
Operating Temperature - Junction (Max)	150°C	150°C	150°C	150°C
Technology	Standard	Standard	Standard	Standard
Speed Classification	Small Signal ≤ 200mA (Io), Any Speed	Small Signal ≤ 200mA (Io), Any Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Small Signal ≤ 200mA (Io), Any Speed
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications):

The M1MA151KT1G from onsemi is the direct equivalent to the M1MA151KT1. This part maintains identical electrical specifications (40 V reverse voltage, 100 mA average rectified current, 1.2 V forward voltage at 100 mA, 3 ns reverse recovery time) and identical package configuration (SC-59, SOT-23-3). The M1MA151KT1G holds active product status and meets ROHS3 compliance, making it suitable for new designs and ongoing production requiring regulatory compliance.

For Enhanced Performance Applications:

The BAL74,215 from Nexperia USA Inc. provides enhanced electrical ratings with 50 V reverse voltage and 215 mA average rectified current while maintaining the same SC-59/SOT-23-3 package footprint. This part is suitable for applications where higher voltage or current margins are required. The BAL74,215 exhibits fast recovery characteristics (4 ns reverse recovery time) and meets ROHS3 compliance.

The DAN202KT146 from Rohm Semiconductor is a diode array configuration (1 Pair Common Cathode) with 80 V reverse voltage rating and 100 mA per diode current rating in the same package family. This part is applicable to designs requiring dual-diode functionality with enhanced voltage rating and meets ROHS3 compliance.

Compliance Considerations:

All active substitute parts (M1MA151KT1G, BAL74,215, DAN202KT146) meet ROHS3 compliance and REACH unaffected status, addressing regulatory requirements for current manufacturing standards. The original M1MA151KT1 is RoHS non-compliant and obsolete; transition to an active equivalent is recommended for new procurement.

Frequently Asked Questions (FAQ)

Q: Can the M1MA151KT1G be used as a direct replacement for the M1MA151KT1?

A: Yes. The M1MA151KT1G is a direct equivalent with identical electrical specifications (40 V, 100 mA, 1.2 V forward voltage, 3 ns recovery time) and identical SC-59 package. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: What is the difference between the M1MA151KT1 and BAL74,215?

A: The BAL74,215 has enhanced electrical ratings: 50 V reverse voltage (vs. 40 V) and 215 mA average rectified current (vs. 100 mA). Both use the same SC-59/SOT-23-3 package footprint. The BAL74,215 exhibits fast recovery characteristics (4 ns vs. 3 ns). Applications requiring higher voltage or current capacity can use the BAL74,215 as a substitute.

Q: Is the DAN202KT146 compatible with circuits designed for the M1MA151KT1?

A: The DAN202KT146 is a diode array (1 Pair Common Cathode) rather than a single diode. While it shares the same SC-59/SOT-23-3 package footprint and meets the 100 mA per diode current requirement, circuit topology must accommodate the dual-diode configuration and common cathode connection. Electrical specifications (80 V reverse voltage, 100 mA per diode, 1.2 V forward voltage) exceed the original part requirements.

Q: What packaging formats are available for these substitute parts?

A: M1MA151KT1G is available in Tape & Reel (TR) format. BAL74,215 is available in Tape & Reel (TR) format. DAN202KT146 is available in Cut Tape (CT) & Digi-Reel® format. All parts use the same SC-59/SOT-23-3 footprint for PCB assembly.

Q: Are all substitute parts RoHS compliant?

A: Yes. M1MA151KT1G, BAL74,215, and DAN202KT146 all meet ROHS3 compliance. The original M1MA151KT1 is RoHS non-compliant. For applications subject to RoHS regulations, transition to an active substitute is required.

Q: What is the moisture sensitivity level for these parts?

A: All parts (M1MA151KT1, M1MA151KT1G, BAL74,215, DAN202KT146) have Moisture Sensitivity Level (MSL) 1 (Unlimited), indicating no moisture sensitivity restrictions for storage and handling.

Q: Can I use the BAL74,215 in a circuit designed for 40 V operation?

A: Yes. The BAL74,215 has a 50 V reverse voltage rating, which exceeds the 40 V requirement. The part operates safely in circuits rated for 40 V. The higher voltage rating provides additional design margin without affecting circuit functionality at lower voltages.

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