SS25 M4G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS25 M4G is a 50V, 2A Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation in DO-214AA (SMB) surface mount package. This component is classified as discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing production and repair applications. The part operates across a junction temperature range of -55°C to 150°C and exhibits fast recovery characteristics suitable for high-frequency switching applications.

Key Parameters

Parameter	Value
Voltage - DC Reverse (Vr) (Max)	50 V
Current - Average Rectified (Io)	2 A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 2 A
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr	400 µA @ 50 V
Package / Case	DO-214AA, SMB
Operating Temperature - Junction	-55°C ~ 150°C
Technology	Schottky
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS25 M4G is determined by strict electrical and mechanical parameter matching within the Schottky diode rectifier category. The primary substitution criteria are:

Critical Parameters for Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50 V
Current - Average Rectified (Io): Must equal or exceed 2 A
Package / Case: Must be DO-214AA (SMB) or compatible surface mount package
Technology: Schottky rectifier type
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount

Substitute parts are grouped into two categories based on current rating compatibility:

Category 1 - Direct Current Rating Match (2A): Parts with 2A average rectified current in DO-214AA SMB package or equivalent surface mount packages (SMA).

Category 2 - Higher Current Rating (3A): Parts with 3A average rectified current in DO-214AA SMB package, suitable for applications where the SS25 M4G operates below maximum current specifications.

Parts with 1A current rating are excluded from primary substitution due to insufficient current capacity for the 2A design specification of the SS25 M4G.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io (A)	Vf (Max) @ If	Package	Temp Range (°C)	Product Status
SS25 M4G	Taiwan Semiconductor Corporation	50 V	2	700 mV @ 2 A	DO-214AA, SMB	-55 ~ 150	Discontinued
B250-13-F	Diodes Incorporated	50 V	2	700 mV @ 2 A	DO-214AA, SMB	-65 ~ 150	Active
B250Q-13-F	Diodes Incorporated	50 V	2	700 mV @ 2 A	DO-214AA, SMB	-65 ~ 150	Active
B250A-13-F	Diodes Incorporated	50 V	2	700 mV @ 2 A	DO-214AC, SMA	-65 ~ 150	Active
B350B-E3/52T	Vishay General Semiconductor - Diodes Division	50 V	3	660 mV @ 3 A	DO-214AA, SMB	-55 ~ 150	Active
B350B-E3/5BT	Vishay General Semiconductor - Diodes Division	50 V	3	660 mV @ 3 A	DO-214AA, SMB	-55 ~ 150	Active

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

The B250-13-F and B250Q-13-F from Diodes Incorporated are direct electrical and mechanical equivalents to the SS25 M4G. Both parts maintain identical voltage and current ratings (50V, 2A), forward voltage characteristics (700 mV @ 2A), and package configuration (DO-214AA SMB). Both are in active production status with extended temperature operating ranges (-65°C to 150°C). The B250Q-13-F carries AEC-Q101 automotive qualification, providing additional reliability assurance for critical applications.

Alternative Package Option:

The B250A-13-F provides equivalent electrical performance in a DO-214AC (SMA) surface mount package. This part is suitable for applications where SMA package footprints are acceptable or preferred. Mechanical board layout modifications are required for package transition.

Higher Current Capacity Alternatives:

The B350B-E3/52T and B350B-E3/5BT from Vishay General Semiconductor provide 3A average rectified current in the same DO-214AA SMB package. These parts are suitable for designs operating the SS25 M4G below its 2A maximum specification, offering additional current margin. Forward voltage is reduced to 660 mV @ 3A, providing improved efficiency characteristics. Both variants maintain identical package footprints and operating temperature ranges matching the original part.

Compliance and Certification:

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status consistent with the SS25 M4G. The B250Q-13-F and B350B variants carry AEC-Q101 automotive qualification for applications requiring automotive-grade component certification.

Frequently Asked Questions (FAQ)

Q: Can the B250-13-F directly replace the SS25 M4G without circuit modifications?

A: Yes. The B250-13-F is electrically and mechanically equivalent. Both parts share identical voltage ratings (50V), current ratings (2A), forward voltage characteristics (700 mV @ 2A), and DO-214AA SMB package configuration. No circuit modifications are required.

Q: What is the difference between B250-13-F and B250Q-13-F?

A: Both parts are electrically identical with 50V, 2A ratings and 700 mV forward voltage. The B250Q-13-F carries AEC-Q101 automotive qualification and is specified for automotive applications. Selection depends on application requirements for automotive-grade certification.

Q: Why would I select the B350B-E3/5BT over the B250-13-F?

A: The B350B-E3/5BT provides 3A average rectified current capacity compared to 2A for the B250-13-F. Selection is appropriate for applications where the SS25 M4G operates below maximum current specifications and additional current margin is beneficial. The B350B also exhibits lower forward voltage (660 mV @ 3A) compared to 700 mV @ 2A for the B250-13-F.

Q: Is the B250A-13-F compatible with existing PCB layouts designed for the SS25 M4G?

A: No. The B250A-13-F uses a DO-214AC (SMA) package, which differs mechanically from the DO-214AA (SMB) package of the SS25 M4G. PCB footprint modifications are required for this substitution.

Q: What is the temperature operating range difference between the SS25 M4G and substitute parts?

A: The SS25 M4G operates from -55°C to 150°C. The B250-13-F and B250Q-13-F extend the lower temperature limit to -65°C. The B350B variants maintain the -55°C lower limit. All parts share the 150°C upper temperature limit.

Q: Are all substitute parts in active production status?

A: Yes. All recommended substitute parts (B250-13-F, B250Q-13-F, B250A-13-F, B350B-E3/52T, B350B-E3/5BT) are in active production status. The SS25 M4G is discontinued at DiGi Electronics, making these active alternatives necessary for ongoing supply.

Q: Do the substitute parts maintain the same reverse leakage current specifications?

A: No. The SS25 M4G specifies 400 µA @ 50V reverse leakage. The B250 series parts specify 500 µA @ 50V. The B350B series parts specify 100 µA @ 50V, providing superior reverse leakage performance.

Q: What packaging format is available for the substitute parts?

A: The B250-13-F, B250Q-13-F, B350B-E3/52T, and B350B-E3/5BT are supplied in Tape & Reel (TR) format. The B250A-13-F is also supplied in Tape & Reel format. All parts are suitable for automated assembly processes.

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