SS25-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS25-TP is a surface mount Schottky rectifier diode manufactured by Micro Commercial Co, rated for 50 V DC reverse voltage and 2 A average rectified current in a DO-214AC (SMA) package. The part is classified as Obsolete, necessitating identification of equivalent and substitute components for ongoing production and design requirements. Substitute parts are selected based on electrical performance parameters, mechanical compatibility, and manufacturing availability.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	2	A
Voltage - Forward (Vf) (Max) @ If	700 mV @ 2 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 50 V	µA
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 125°C	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SS25-TP are categorized into two groups based on electrical parameter alignment:

Direct Equivalent (Same Electrical Ratings): The SS25-LTP from Micro Commercial Co maintains identical electrical specifications: 50 V reverse voltage, 2 A average rectified current, 700 mV forward voltage at 2 A, and fast recovery characteristics. This part differs only in product status (Not For New Designs) and includes specified capacitance data (50 pF @ 4V, 1MHz).

Functional Equivalents (Reduced Ratings): The STPS140AY, STPS140A, and STPS1L40A from STMicroelectronics, along with the B250A-13-F from Diodes Incorporated, operate at reduced voltage and current ratings. These parts are suitable for applications where the full 50 V / 2 A capability of the SS25-TP is not required. Substitution is valid only when circuit design permits operation within the lower electrical envelope of these alternatives.

Key Parameters Determining Substitution:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed circuit requirements
Current - Average Rectified (Io): Must equal or exceed circuit requirements
Package / Case: Must be DO-214AC (SMA) for mechanical compatibility
Mounting Type: Must be Surface Mount
Technology: Must be Schottky
Speed: Must maintain Fast Recovery characteristics

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Reverse Leakage @ Vr	Package	Product Status	Temp Range
SS25-TP	Micro Commercial Co	50 V	2 A	700 mV @ 2 A	500 µA @ 50 V	DO-214AC (SMA)	Obsolete	-55°C ~ 125°C
SS25-LTP	Micro Commercial Co	50 V	2 A	700 mV @ 2 A	500 µA @ 50 V	DO-214AC (SMA)	Not For New Designs	-55°C ~ 125°C
B250A-13-F	Diodes Incorporated	50 V	2 A	700 mV @ 2 A	500 µA @ 50 V	DO-214AC (SMA)	Active	-65°C ~ 150°C
STPS140AY	STMicroelectronics	40 V	1 A	650 mV @ 2 A	12 µA @ 40 V	DO-214AC (SMA)	Active	-40°C ~ 150°C
STPS140A	STMicroelectronics	40 V	1 A	550 mV @ 1 A	12 µA @ 40 V	DO-214AC (SMA)	Active	—
STPS1L40A	STMicroelectronics	40 V	1 A	500 mV @ 1 A	35 µA @ 40 V	DO-214AC (SMA)	Active	—

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): The B250A-13-F from Diodes Incorporated is the recommended substitute for the obsolete SS25-TP. This part maintains all critical electrical specifications (50 V reverse voltage, 2 A average rectified current, 700 mV forward voltage) and is classified as Active product status. The B250A-13-F offers an extended operating temperature range (-65°C ~ 150°C) compared to the original SS25-TP (-55°C ~ 125°C), providing improved thermal margin. Both parts are ROHS3 Compliant, MSL 1, and REACH Unaffected, ensuring regulatory compliance.

The SS25-LTP from Micro Commercial Co provides electrical equivalence but carries a "Not For New Designs" status, limiting its suitability for new production applications despite higher inventory availability.

For Reduced-Rating Applications: The STPS140AY, STPS140A, and STPS1L40A from STMicroelectronics are suitable only for circuits designed to operate within 40 V reverse voltage and 1 A average rectified current limits. These parts are Active status and widely available. Selection among these three STMicroelectronics options depends on forward voltage performance requirements: STPS1L40A offers the lowest forward voltage (500 mV @ 1 A), while STPS140AY includes automotive-grade qualification (-40°C ~ 150°C operating range).

Compliance and Certification: All recommended substitute parts maintain ROHS3 compliance, MSL 1 moisture sensitivity, and REACH Unaffected status, matching the original SS25-TP specifications.

Frequently Asked Questions (FAQ)

Q: Can the STPS140AY be used as a direct replacement for the SS25-TP?

A: No. The STPS140AY is rated for 40 V reverse voltage and 1 A average rectified current, compared to the SS25-TP's 50 V and 2 A ratings. Substitution is valid only if the circuit design operates within these reduced electrical limits. Direct replacement requires a part with matching 50 V / 2 A specifications.

Q: What is the primary difference between SS25-LTP and B250A-13-F?

A: Both parts provide identical electrical performance (50 V, 2 A, 700 mV forward voltage). The key difference is product status: SS25-LTP is "Not For New Designs," while B250A-13-F is "Active." For new production, B250A-13-F is the preferred choice. Additionally, B250A-13-F offers an extended operating temperature range (-65°C ~ 150°C versus -55°C ~ 125°C).

Q: Are all substitute parts compatible with the DO-214AC (SMA) package footprint?

A: Yes. All listed substitute parts use the DO-214AC (SMA) package and are surface mount devices, ensuring mechanical and footprint compatibility with the original SS25-TP design.

Q: Why do the STMicroelectronics parts (STPS140AY, STPS140A, STPS1L40A) have lower current ratings?

A: These parts are designed for lower current applications (1 A versus 2 A). They are not reduced-rating versions of the SS25-TP but rather distinct product lines optimized for different power levels. Substitution requires circuit verification that the 1 A rating is sufficient.

Q: What is the significance of the "Automotive" grade designation on STPS140AY?

A: The STPS140AY carries automotive-grade qualification, indicating it meets automotive industry reliability and testing standards. This designation does not affect electrical compatibility but may be relevant for automotive applications requiring qualified components.

Q: Can forward voltage differences between substitute parts affect circuit performance?

A: Yes. Forward voltage variations (ranging from 500 mV to 700 mV across the substitute options) directly impact voltage drop across the diode and power dissipation. Circuit designs with tight voltage margin requirements must account for these differences during substitution evaluation.

Q: Is the SS25-TP still available for purchase?

A: The SS25-TP is classified as Obsolete. While 3110 pieces are listed as in stock, long-term availability is not guaranteed. The B250A-13-F (39,825 pieces in stock) and STMicroelectronics alternatives (16,900 to 105,400 pieces) offer superior supply continuity.

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