SS25 R5G Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS25 R5G 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 switching power supply and rectification circuits.

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
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS25 R5G is determined by strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 50 V minimum
Current - Average Rectified (Io): 2 A minimum
Package / Case: DO-214AA, SMB (mechanical compatibility)
Technology: Schottky (functional equivalence)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Acceptable Variation Parameters:

Voltage - Forward (Vf) (Max) @ If: ±50 mV tolerance acceptable
Current - Reverse Leakage @ Vr: Higher values acceptable within design margins
Operating Temperature - Junction: Extended ranges acceptable

Substitute parts are grouped into two categories:

Category A - Direct Electrical Equivalents (2A Rating): Parts meeting or exceeding the 2A current specification with identical 50V reverse voltage rating and DO-214AA package. These include B250-13-F, B250Q-13-F, and B250A-13-F (SMA variant).

Category B - Higher Current Capability (3A Rating): Parts exceeding the 2A specification with 3A current rating, providing design margin. These include B350B-E3/52T and B350B-E3/5BT.

Category C - Lower Current Capability (1A Rating): Parts with reduced current specification. These include B150BQ-13-F, SK15-LTP, SK15-TP, and SK15E3/TR13. These are suitable only for applications where the 2A requirement can be reduced.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Temp Range	Status
SS25 R5G	Taiwan Semiconductor	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-55°C ~ 150°C	Discontinued
B250-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-65°C ~ 150°C	Active
B250Q-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-65°C ~ 150°C	Active
B250A-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	DO-214AC, SMA	-65°C ~ 150°C	Active
B350B-E3/52T	Vishay General Semiconductor	50 V	3 A	660 mV @ 3 A	DO-214AA, SMB	-55°C ~ 150°C	Active
B350B-E3/5BT	Vishay General Semiconductor	50 V	3 A	660 mV @ 3 A	DO-214AA, SMB	-55°C ~ 150°C	Active
B150BQ-13-F	Diodes Incorporated	50 V	1 A	700 mV @ 1 A	DO-214AA, SMB	-65°C ~ 150°C	Active
SK15-LTP	Micro Commercial Co	50 V	1 A	720 mV @ 1 A	DO-214AA, SMB	-55°C ~ 125°C	Not For New Designs
SK15-TP	Micro Commercial Co	50 V	1 A	720 mV @ 1 A	DO-214AA, SMB	-55°C ~ 125°C	Active
SK15E3/TR13	Microsemi Corporation	50 V	1 A	720 mV @ 1 A	DO-214AA, SMB	-65°C ~ 175°C	Active
SK35B-LTP	Micro Commercial Co	50 V	3 A	750 mV @ 3 A	DO-214AA, SMB	-55°C ~ 150°C	Not For New Designs

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents):

B250-13-F and B250Q-13-F from Diodes Incorporated are the preferred direct substitutes for the SS25 R5G. Both parts maintain identical electrical specifications (50V, 2A, 700mV forward voltage) and DO-214AA package compatibility. B250Q-13-F carries AEC-Q101 automotive qualification, suitable for applications requiring automotive-grade reliability. Both parts are in active production status with extended operating temperature ranges (-65°C to 150°C) compared to the original part.

Alternative with Package Consideration:

B250A-13-F provides electrical equivalence but uses DO-214AC (SMA) package instead of DO-214AA (SMB). This part is suitable only for applications where the larger SMA footprint can be accommodated on the PCB. The electrical performance is identical to B250-13-F.

Higher Current Capability Option:

B350B-E3/52T and B350B-E3/5BT from Vishay General Semiconductor provide 3A current rating with identical 50V reverse voltage and DO-214AA package. These parts exhibit lower forward voltage (660mV @ 3A) and lower reverse leakage current (100µA @ 50V) compared to the SS25 R5G. These are suitable for applications where increased current margin is required or where the lower forward voltage provides thermal benefits.

Lower Current Alternatives:

B150BQ-13-F, SK15-TP, and SK15E3/TR13 are 1A-rated alternatives suitable only for applications where the circuit current requirement does not exceed 1A. These parts maintain 50V reverse voltage and DO-214AA package compatibility. SK15E3/TR13 offers the widest operating temperature range (-65°C to 175°C) among 1A options.

Compliance and Production Status:

All recommended active-status substitutes maintain ROHS3 compliance and REACH unaffected status consistent with the original SS25 R5G. Parts marked "Not For New Designs" (SK15-LTP, SK35B-LTP) are suitable for legacy system maintenance only and should not be selected for new product development.

Frequently Asked Questions (FAQ)

Q: Can B250-13-F directly replace SS25 R5G without PCB modification?

A: Yes. B250-13-F maintains identical electrical specifications (50V, 2A, 700mV forward voltage) and DO-214AA package footprint. No PCB layout changes 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 DO-214AA packages. B250Q-13-F carries AEC-Q101 automotive qualification and is suitable for automotive applications. B250-13-F is the standard industrial-grade version. Selection depends on application requirements.

Q: Why would I select B350B-E3/52T over B250-13-F if both fit the same package?

A: B350B-E3/52T provides 3A current capability versus 2A, offering design margin for applications with variable or peak current demands. The lower forward voltage (660mV @ 3A) also reduces power dissipation. Selection depends on whether the additional current capacity and thermal benefits justify the part cost.

Q: Can B250A-13-F be used as a substitute?

A: B250A-13-F is electrically equivalent but uses DO-214AC (SMA) package instead of DO-214AA (SMB). It can be used only if the PCB layout accommodates the larger SMA footprint. The electrical performance is identical to B250-13-F.

Q: Are 1A-rated parts like B150BQ-13-F suitable substitutes?

A: B150BQ-13-F and other 1A-rated alternatives are suitable only for applications where the circuit current requirement does not exceed 1A. They maintain 50V reverse voltage and DO-214AA package compatibility but provide reduced current capacity. Circuit analysis is required to confirm 1A adequacy.

Q: What is the significance of the operating temperature range difference?

A: The SS25 R5G operates from -55°C to 150°C. Most active substitutes (B250-13-F, B250Q-13-F) extend the lower limit to -65°C, providing wider environmental operating margin. SK15E3/TR13 extends to 175°C maximum. Selection depends on application temperature requirements.

Q: Why is SK15-LTP marked "Not For New Designs"?

A: Parts marked "Not For New Designs" are in legacy status and may have limited future availability or production support. For new product development, active-status parts such as B250-13-F, B250Q-13-F, or B350B-E3/52T are recommended.

Q: What does RoHS3 compliance mean for this application?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All recommended substitutes maintain ROHS3 compliance consistent with the original SS25 R5G, ensuring regulatory compliance for end applications.

Q: How do I determine if a substitute part will work in my circuit?

A: Verify three critical parameters: (1) Reverse voltage rating must equal or exceed 50V, (2) Average rectified current must equal or exceed your circuit requirement, (3) Package must be DO-214AA (SMB) for direct PCB compatibility. Forward voltage and reverse leakage variations within the specified ranges do not affect circuit function.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message