MSG150 Schottky Diode 50V 1A DO-204AL Equivalent & Substitute Parts

Part Overview

The MSG150 is a Schottky rectifier diode rated for 50V DC reverse voltage and 1A average rectified current in a DO-204AL (DO-41) through-hole axial package. This component is classified as obsolete, making identification of equivalent substitute parts necessary for ongoing design support and procurement. The MSG150 is manufactured by Microchip Technology and features fast recovery characteristics suitable for switching applications requiring low forward voltage drop.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	580 mV @ 1 A	mV
Current - Reverse Leakage @ Vr	100	µA @ 50 V
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Mounting Type	Through Hole	—
Package / Case	DO-204AL, DO-41, Axial	—
Operating Temperature - Junction	-65°C ~ 150°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the MSG150 is determined by strict equivalence across the following critical parameters:

Voltage Rating: DC reverse voltage must equal 50V maximum
Current Rating: Average rectified current must equal 1A
Package Type: DO-204AL (DO-41) axial through-hole configuration
Technology: Schottky rectifier diode
Speed Classification: Fast recovery characteristic ≤ 500ns at > 200mA

The MSG105 manufactured by Microsemi Corporation meets all substitution criteria. Both devices share identical voltage and current ratings, package configuration, and speed characteristics. Differences in forward voltage drop (Vf) and maximum junction temperature do not disqualify substitution when the MSG105 operates within the application's thermal and voltage margin requirements.

Parameter Comparison

Parameter	MSG150 (Microchip)	MSG105 (Microsemi)	Match Status
Voltage - DC Reverse (Vr) (Max)	50 V	50 V	Equivalent
Current - Average Rectified (Io)	1 A	1 A	Equivalent
Voltage - Forward (Vf) (Max) @ If	580 mV @ 1 A	690 mV @ 1 A	Substitute (Higher Vf)
Current - Reverse Leakage @ Vr	100 µA @ 50 V	100 µA @ 50 V	Equivalent
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Equivalent
Mounting Type	Through Hole	Through Hole	Equivalent
Package / Case	DO-204AL, DO-41, Axial	DO-204AL, DO-41, Axial	Equivalent
Operating Temperature - Junction	-65°C ~ 150°C	-65°C ~ 175°C	Substitute (Extended Range)
Product Status	Obsolete	Active	Substitute (Active)
RoHS Status	RoHS non-compliant	RoHS non-compliant	Equivalent

Engineering Selection Recommendations

The MSG105 is a direct functional substitute for the obsolete MSG150. Selection of the MSG105 is supported by the following factors:

Product Status: The MSG105 maintains active product status with Microsemi Corporation, ensuring continued availability and supply chain stability compared to the obsolete MSG150.

Electrical Equivalence: Both devices share identical voltage and current ratings (50V, 1A), reverse leakage characteristics (100 µA @ 50V), and fast recovery speed classification (≤ 500ns). The MSG105 exhibits higher forward voltage drop (690 mV versus 580 mV at 1A), which increases power dissipation by approximately 110 mV per device. Circuit designs must accommodate this additional voltage drop in power budget calculations.

Thermal Performance: The MSG105 provides extended maximum junction temperature rating (-65°C to 175°C) compared to the MSG150 (-65°C to 150°C), offering improved thermal margin in applications approaching upper temperature limits.

Package Compatibility: Both devices utilize identical DO-204AL (DO-41) axial through-hole packaging, enabling direct mechanical and electrical substitution without PCB redesign.

Compliance: Both devices maintain equivalent RoHS non-compliance status and REACH unaffected classification, with identical ECCN and HTSUS codes.

Frequently Asked Questions (FAQ)

Q: Can the MSG105 replace the MSG150 in existing designs?

A: The MSG105 is electrically and mechanically compatible with the MSG150 across all critical parameters. The primary design consideration is the 110 mV higher forward voltage drop of the MSG105, which increases power dissipation. Verify that circuit power budgets and thermal management accommodate this difference.

Q: What is the significance of the forward voltage difference between these devices?

A: The MSG150 exhibits 580 mV forward voltage drop at 1A, while the MSG105 exhibits 690 mV at the same current. This 110 mV difference results in proportionally higher power dissipation in the substitute device. For a 1A circuit, this represents approximately 110 mW additional heat generation. Applications with tight thermal constraints or high-frequency switching must account for this increase.

Q: Are the DO-204AL and DO-41 package designations interchangeable?

A: Yes. DO-204AL and DO-41 refer to the same axial through-hole package configuration. Both the MSG150 and MSG105 use this identical package, enabling direct board-level substitution without mechanical modification.

Q: Does the extended temperature range of the MSG105 provide any advantage?

A: The MSG105 supports junction temperatures to 175°C compared to the MSG150's 150°C maximum. This extended range provides additional thermal margin in applications operating near upper temperature limits, though it does not change the device's electrical performance within standard operating ranges.

Q: What compliance considerations apply to substitution?

A: Both devices maintain identical RoHS non-compliance status and REACH unaffected classification. No compliance advantage or disadvantage exists between the MSG150 and MSG105. Applications requiring RoHS-compliant components must source alternative part families.

Q: Is the MSG105 the only available substitute for the MSG150?

A: The provided substitute list contains only the MSG105. Other Schottky diodes with 50V/1A ratings in DO-204AL packaging may exist from alternative manufacturers, but only the MSG105 is documented as an equivalent substitute in this reference.

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