SS25HM4G Equivalent & Substitute Parts

Part Overview

The SS25HM4G is a Schottky rectifier diode rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-214AA (SMB) surface mount package. Manufactured by Taiwan Semiconductor Corporation, this component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent alternatives for ongoing production and repair applications. The part meets automotive-grade specifications with AEC-Q101 qualification and operates across a junction temperature range of -55°C to 150°C. Equivalent and substitute parts must maintain electrical performance characteristics and mechanical compatibility while considering current product availability and design status.

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
Technology	Schottky
Package / Case	DO-214AA, SMB
Mounting Type	Surface Mount
Operating Temperature - Junction	-55°C ~ 150°C
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SS25HM4G is determined by strict equivalence in the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 50 V
Current - Average Rectified (Io): 2 A
Voltage - Forward (Vf) (Max) @ If: 700 mV @ 2 A
Technology: Schottky
Package / Case: DO-214AA, SMB
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Operating Temperature Range: Minimum -55°C junction temperature
Speed Classification: Fast Recovery ≤ 500ns, > 200mA (Io)
Reverse Leakage Current: ≤ 500 µA @ 50 V
Compliance: ROHS3 Compliant, REACH Unaffected

Parts meeting all primary criteria are direct electrical and mechanical equivalents. Parts with identical electrical ratings but different package designations (SMA vs. SMB) require board-level design verification. Parts with lower current ratings (1 A) or higher current ratings (3 A) are not direct substitutes but may be considered for specific application requirements where thermal and current handling differ from the original design.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf @ If	Package	Temp Range (Tj)	Product Status	Grade
SS25HM4G	Taiwan Semiconductor Corporation	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-55°C ~ 150°C	Discontinued	Automotive
B250-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-65°C ~ 150°C	Active	Not specified
B250Q-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-65°C ~ 150°C	Active	Automotive
B250A-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	DO-214AC, SMA	-65°C ~ 150°C	Active	Not specified
SS25	Taiwan Semiconductor Corporation	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-55°C ~ 150°C	Active	Not specified
SS25-M3/52T	Vishay General Semiconductor - Diodes Division	50 V	2 A	700 mV @ 2 A	DO-214AA, SMB	-65°C ~ 150°C	Active	Not specified
B150BQ-13-F	Diodes Incorporated	50 V	1 A	700 mV @ 1 A	DO-214AA, SMB	-65°C ~ 150°C	Active	Automotive
SK15-LTP	Micro Commercial Co	50 V	1 A	720 mV @ 1 A	DO-214AA, SMB	-55°C ~ 125°C	Not For New Designs	Not specified
SK15-TP (SMBSR105)	Micro Commercial Co	50 V	1 A	720 mV @ 1 A	DO-214AA, SMB	-55°C ~ 125°C	Active	Not specified
SK15E3/TR13	Microsemi Corporation	50 V	1 A	720 mV @ 1 A	DO-214AA, SMB	-65°C ~ 175°C	Active	Not specified
SK35B-LTP	Micro Commercial Co	50 V	3 A	750 mV @ 3 A	DO-214AA, SMB	-55°C ~ 150°C	Not For New Designs	Not specified

Engineering Selection Recommendations

Direct Electrical and Mechanical Equivalents (2 A, 50 V, DO-214AA SMB):

The following parts provide direct substitution for the SS25HM4G with identical electrical ratings and package configuration:

B250-13-F (Diodes Incorporated): Active product status with extended temperature range (-65°C to 150°C). Suitable for applications requiring higher reliability and current availability.
B250Q-13-F (Diodes Incorporated): Active product with automotive-grade classification and AEC-Q101 qualification, matching the original part's automotive requirements. Extended temperature range (-65°C to 150°C).
SS25 (Taiwan Semiconductor Corporation): Active product from the same manufacturer as the original part. Maintains identical electrical specifications and temperature range (-55°C to 150°C). Highest inventory availability (35,100 pcs).
SS25-M3/52T (Vishay General Semiconductor - Diodes Division): Active product with extended temperature range (-65°C to 150°C). Tape & Reel packaging for production environments.

Package Variant (2 A, 50 V, DO-214AC SMA):

B250A-13-F (Diodes Incorporated): Identical electrical specifications but in SMA package (DO-214AC) instead of SMB. Requires PCB footprint modification. Active product status.

Lower Current Rating (1 A, 50 V, DO-214AA SMB):

The following parts are not direct substitutes but may be considered for applications with reduced current requirements:

B150BQ-13-F (Diodes Incorporated): Automotive-grade, AEC-Q101 qualified. Active product.
SK15-TP (SMBSR105) (Micro Commercial Co): Active product with extended temperature range capability.
SK15E3/TR13 (Microsemi Corporation): Active product with extended temperature range (-65°C to 175°C).

Higher Current Rating (3 A, 50 V, DO-214AA SMB):

SK35B-LTP (Micro Commercial Co): Not recommended for new designs. Current rating exceeds original specification.

Selection Priority for Replacement:

B250Q-13-F: Recommended for automotive applications requiring AEC-Q101 qualification and active product support.
SS25: Recommended for cost-optimized solutions with highest inventory availability.
B250-13-F: Recommended for extended temperature range requirements.
SS25-M3/52T: Recommended for tape & reel production environments.

Frequently Asked Questions (FAQ)

Q: Can B250-13-F directly replace SS25HM4G without PCB modifications?

A: Yes. B250-13-F provides identical electrical specifications (50 V, 2 A, 700 mV forward voltage) and identical package configuration (DO-214AA SMB). No PCB modifications are required.

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

A: Both parts have identical electrical ratings and package configuration. B250Q-13-F carries automotive-grade classification with AEC-Q101 qualification, matching the original SS25HM4G. B250-13-F does not specify automotive grade. For automotive applications, B250Q-13-F is the appropriate selection.

Q: Can I use B250A-13-F as a substitute?

A: B250A-13-F has identical electrical specifications but uses SMA package (DO-214AC) instead of SMB package (DO-214AA). This requires PCB footprint modification. Electrical performance is equivalent.

Q: Why is SS25 listed as a substitute when it is also from Taiwan Semiconductor Corporation?

A: SS25 is the active product variant of the discontinued SS25HM4G. Both parts share identical electrical specifications and temperature range. SS25 is currently in production with significantly higher inventory availability (35,100 pcs vs. 679 pcs for the original part).

Q: Can I use 1 A rated parts like B150BQ-13-F or SK15-TP?

A: 1 A rated parts are not direct substitutes for the 2 A rated SS25HM4G. These parts have lower current handling capacity and should only be used if the application circuit has been redesigned for reduced current requirements.

Q: What is the significance of the temperature range difference between -55°C and -65°C minimum?

A: The extended minimum temperature range (-65°C vs. -55°C) in parts like B250-13-F and B250Q-13-F provides additional margin for low-temperature operation. This is a superset capability and does not prevent substitution. Applications operating above -55°C are unaffected by this difference.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance of the original SS25HM4G.

Q: What does "Not For New Designs" mean for SK15-LTP and SK35B-LTP?

A: Parts marked "Not For New Designs" are in legacy status and may have limited future availability or support. These parts should not be selected for new product development. Existing designs using these parts may continue to source them, but alternatives with "Active" status are preferred.

Q: Is automotive qualification required for my application?

A: Automotive qualification (AEC-Q101) is required only for applications in automotive systems. B250Q-13-F and B150BQ-13-F carry this qualification. For non-automotive applications, parts without automotive grade designation are acceptable.

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