SS15 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SS15 is a Schottky rectifier diode manufactured by onsemi, rated for 50 V DC reverse voltage and 1 A average rectified current in a DO-214AC (SMA) surface mount package. This device is classified as "Not For New Designs," indicating it has reached end-of-life status. The fast recovery characteristic (≤500 ns) and low forward voltage drop (700 mV @ 1 A) make it suitable for switching power supplies, battery charging circuits, and general rectification applications. Due to its discontinued status, equivalent and substitute parts from active manufacturers are necessary for ongoing production and design updates.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	50	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) Maximum @ If	700 mV @ 1 A	mV
Speed	Fast Recovery ≤500 ns, >200 mA (Io)	ns
Current - Reverse Leakage @ Vr	200	µA @ 50 V
Mounting Type	Surface Mount	—
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS15 is determined by the following critical parameters:

Mandatory Matching Criteria:

Schottky diode technology
Minimum 50 V DC reverse voltage rating
Minimum 1 A average rectified current rating
Surface mount package (DO-214AC/SMA or compatible)
Fast recovery speed (≤500 ns)
RoHS3 compliance

Acceptable Variation Ranges:

Forward voltage drop: 530 mV to 700 mV @ rated current (lower values indicate improved efficiency)
Reverse leakage current: 12 µA to 500 µA @ rated voltage (lower values indicate better performance)
Operating temperature range: Minimum -55°C to maximum 150°C (must encompass -65°C to 125°C)
Current rating: Equal to or greater than 1 A
Voltage rating: Equal to or greater than 50 V

Substitute parts are grouped into three categories:

Direct Equivalents (50 V, 1 A): Parts with identical voltage and current ratings, suitable for direct replacement without circuit modification.

Higher Current Ratings (50 V, 2 A or 3 A): Parts with increased current capacity, electrically compatible and physically interchangeable in DO-214AC/SMA packages, providing design margin for higher load conditions.

Lower Voltage Ratings (40 V, 1 A): Parts with reduced voltage ratings, suitable only for applications where the maximum reverse voltage does not exceed 40 V.

Different Package Types (SOD-123W): Parts with different surface mount packages, requiring PCB layout modification but offering alternative electrical characteristics.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Reverse Leakage [µA]	Package	Tj (Max) [°C]	Product Status
SS15	onsemi	50	1	700 @ 1 A	200 @ 50 V	DO-214AC (SMA)	125	Not For New Designs
B150Q-13-F	Diodes Incorporated	50	1	700 @ 1 A	500 @ 40 V	DO-214AC (SMA)	150	Active
B150-13-F	Diodes Incorporated	50	1	700 @ 1 A	500 @ 50 V	DO-214AC (SMA)	150	Active
B250A-13-F	Diodes Incorporated	50	2	700 @ 2 A	500 @ 50 V	DO-214AC (SMA)	150	Active
B250AQ-13-F	Diodes Incorporated	50	2	700 @ 2 A	500 @ 50 V	DO-214AC (SMA)	150	Active
B350A-13-F	Diodes Incorporated	50	3	700 @ 3 A	500 @ 50 V	DO-214AC (SMA)	150	Active
MBRA140T3G	onsemi	40	1	550 @ 1 A	500 @ 40 V	DO-214AC (SMA)	125	Active
STPS140A	STMicroelectronics	40	1	550 @ 1 A	12 @ 40 V	DO-214AC (SMA)	150	Active
STPS140AY	STMicroelectronics	40	1	650 @ 2 A	12 @ 40 V	DO-214AC (SMA)	150	Active
PMEG6010ER,115	Nexperia USA Inc.	60	1	530 @ 1 A	60 @ 60 V	SOD-123W	150	Active
PMEG6010ETR,115	Nexperia USA Inc.	60	1	530 @ 1 A	60 @ 60 V	SOD-123W	175	Active

Engineering Selection Recommendations

For Direct Replacement (Same Voltage and Current Rating):

The B150-13-F (Diodes Incorporated) is the primary direct equivalent to the SS15. Both devices are rated for 50 V and 1 A with identical forward voltage characteristics (700 mV @ 1 A). The B150-13-F is in active production status with extended operating temperature range (-65°C to 150°C) and RoHS3 compliance. This part is suitable for immediate substitution in existing designs without circuit modification.

The B150Q-13-F (Diodes Incorporated) offers automotive-grade qualification (AEC-Q101) with identical electrical specifications. This variant is appropriate for applications requiring automotive-level reliability and traceability.

For Higher Current Capacity Applications:

The B250A-13-F and B250AQ-13-F (Diodes Incorporated) provide 2 A current rating while maintaining 50 V voltage rating and identical forward voltage characteristics. These parts are physically interchangeable in DO-214AC/SMA packages and provide design margin for circuits with higher current demands. The B250AQ-13-F includes automotive qualification (AEC-Q101).

The B350A-13-F (Diodes Incorporated) extends current capacity to 3 A with automotive qualification (AEC-Q101), suitable for high-current rectification applications requiring the same 50 V rating.

For Lower Voltage Applications (40 V Maximum):

The STPS140A (STMicroelectronics) is rated for 40 V and 1 A with superior reverse leakage characteristics (12 µA @ 40 V) compared to the SS15. This part is suitable only for applications where reverse voltage does not exceed 40 V. The lower forward voltage (550 mV @ 1 A) provides improved efficiency.

The MBRA140T3G (onsemi) is a 40 V, 1 A alternative with active production status. This part maintains onsemi manufacturing continuity for users preferring single-source supply chains.

For Alternative Package Configurations:

The PMEG6010ETR,115 (Nexperia USA Inc.) provides 60 V, 1 A rating in SOD-123W package with superior reverse leakage (60 µA @ 60 V) and lower forward voltage (530 mV @ 1 A). This part requires PCB layout modification due to different package geometry but offers enhanced thermal performance and higher voltage margin. Maximum junction temperature of 175°C supports high-temperature applications.

Compliance and Production Status:

All recommended substitute parts maintain RoHS3 compliance and REACH unaffected status, matching the SS15 environmental requirements. All substitute parts are in active production, ensuring long-term availability and supply chain stability. Selection should prioritize active production status parts to avoid future obsolescence.

Frequently Asked Questions (FAQ)

Q: Can the B150-13-F directly replace the SS15 without any circuit changes?

A: Yes. The B150-13-F is electrically and mechanically compatible with the SS15. Both devices are rated for 50 V and 1 A with identical forward voltage characteristics (700 mV @ 1 A) and fast recovery speed. The B150-13-F is in active production and offers extended operating temperature range, making it a suitable direct replacement.

Q: What is the difference between B150Q-13-F and B150-13-F?

A: The B150Q-13-F includes automotive-grade qualification (AEC-Q101) and is specified for automotive applications. The B150-13-F is the standard industrial version. Both have identical electrical specifications (50 V, 1 A, 700 mV forward voltage). Selection depends on application requirements for automotive qualification.

Q: Can I use a 40 V rated diode (STPS140A or MBRA140T3G) in place of the SS15?

A: No. The SS15 is rated for 50 V reverse voltage. Using a 40 V rated diode creates risk of diode failure if reverse voltage exceeds 40 V. These parts are suitable only for applications where maximum reverse voltage is confirmed to be 40 V or less.

Q: Why would I choose a higher current rated part like B250A-13-F instead of B150-13-F?

A: Higher current rated parts provide design margin and reduce thermal stress in circuits with variable or peak current conditions. The B250A-13-F (2 A rating) and B350A-13-F (3 A rating) are physically interchangeable in the same DO-214AC/SMA package but offer improved reliability for higher current applications. Forward voltage remains identical at 700 mV.

Q: What are the advantages of the PMEG6010ETR,115 (SOD-123W package)?

A: The PMEG6010ETR,115 offers 60 V rating (10 V higher margin than SS15), lower forward voltage (530 mV @ 1 A for improved efficiency), and superior reverse leakage (60 µA @ 60 V). Maximum junction temperature of 175°C supports high-temperature environments. The SOD-123W package requires PCB layout modification but provides better thermal characteristics for compact designs.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All recommended substitute parts listed maintain RoHS3 compliance and REACH unaffected status, matching the environmental requirements of the SS15.

Q: What is the significance of "Not For New Designs" status on the SS15?

A: This designation indicates the SS15 has reached end-of-life and is no longer recommended for new product designs. Existing inventory may be available, but long-term supply is not guaranteed. New designs should specify active production alternatives such as B150-13-F, STPS140A, or PMEG6010ETR,115 to ensure supply chain continuity.

Q: Can I use STPS140AY (automotive grade) in non-automotive applications?

A: Yes. STPS140AY is rated for 40 V and 1 A with automotive qualification (AEC-Q101). It can be used in non-automotive applications, but the 40 V rating limits its use to circuits where reverse voltage does not exceed 40 V. The automotive qualification does not restrict use in other applications.

Q: What is the difference between reverse leakage specifications across substitute parts?

A: Reverse leakage current varies from 12 µA (STPS140A) to 500 µA (Diodes Incorporated B-series) at their respective rated voltages. Lower reverse leakage indicates better diode quality and reduced power dissipation in standby conditions. STPS140A and PMEG6010ETR,115 offer superior leakage characteristics compared to the SS15 (200 µA @ 50 V).

Q: Are the Diodes Incorporated B150 and B250 series interchangeable in the same PCB footprint?

A: Yes. All Diodes Incorporated B-series parts (B150-13-F, B250A-13-F, B250AQ-13-F, B350A-13-F) use the same DO-214AC (SMA) package and are physically interchangeable. Electrical differences are limited to current rating and forward voltage at higher currents. No PCB modification is required for substitution within this series.

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