SK35A-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK35A-TP is a surface mount Schottky diode manufactured by Micro Commercial Co, rated for 50V DC reverse voltage and 3A average rectified current in a DO-214AC (SMA) package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing design support and procurement continuity. Schottky diodes in this rating class are widely used in power supply circuits, voltage regulation, and reverse polarity protection applications where fast switching and low forward voltage drop are required.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	50	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	750 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 50 V
Capacitance @ Vr, F	250	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Operating Temperature - Junction	-50 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK35A-TP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 50V
Current - Average Rectified (Io): Must equal or exceed 3A
Package / Case: Must be DO-214AC (SMA) surface mount
Technology: Schottky or equivalent fast-switching rectifier technology
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Secondary Compatibility Factors:

Mounting Type: Surface Mount (required)
Operating Temperature Range: Must accommodate application requirements
RoHS Compliance: ROHS3 Compliant (required for regulatory alignment)

Substitute parts are grouped into two categories:

Category 1 - Parametric Equivalents (50V, 3A Rating): Parts that match or exceed the primary electrical specifications of the SK35A-TP, maintaining the 50V reverse voltage rating and 3A current capacity.

Category 2 - Functional Substitutes (40V, 3A Rating): Parts with reduced reverse voltage rating (40V) but identical current capacity (3A). These substitutes are suitable for applications where the circuit design operates below 40V, providing cost or performance advantages while maintaining current handling capability.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Speed	Ir @ Vr	Package	Temp Range	Product Status
SK35A-TP	Micro Commercial Co	50V	3A	750 mV @ 3A	Fast Recovery ≤ 500ns	500 µA @ 50V	DO-214AC (SMA)	-50 to 125°C	Obsolete
SK35A-LTP	Micro Commercial Co	50V	3A	750 mV @ 3A	Fast Recovery ≤ 500ns	500 µA @ 50V	DO-214AC (SMA)	-50 to 125°C	Not For New Designs
B350A-13-F	Diodes Incorporated	50V	3A	700 mV @ 3A	Fast Recovery ≤ 500ns	500 µA @ 50V	DO-214AC (SMA)	-55 to 150°C	Active
CDBA340-HF	Comchip Technology	40V	3A	500 mV @ 3A	Fast Recovery ≤ 500ns	500 µA @ 40V	DO-214AC (SMA)	-50 to 150°C	Active
MBRA340T3G	onsemi	40V	3A	450 mV @ 3A	Fast Recovery ≤ 500ns	300 µA @ 40V	DO-214AC (SMA)	-55 to 150°C	Active
RB058L-40TE25	Rohm Semiconductor	40V	3A	700 mV @ 3A	Fast Recovery ≤ 500ns	5 µA @ 40V	DO-214AC (SMA)	—	Not For New Designs
SBR3A40SAQ-13	Diodes Incorporated	40V	3A	480 mV @ 3A	Standard Recovery >500ns	400 µA @ 40V	DO-214AC (SMA)	-65 to 150°C	Active
XBS204V19R-G	Torex Semiconductor Ltd	40V	2A	490 mV @ 2A	Fast Recovery ≤ 500ns	100 µA @ 40V	DO-214AC (SMA)	—	Active

Engineering Selection Recommendations

Recommended Primary Substitute: B350A-13-F (Diodes Incorporated)

The B350A-13-F is the preferred substitute for the SK35A-TP. This part maintains the 50V reverse voltage rating and 3A current capacity, ensuring direct electrical compatibility. The B350A-13-F is in Active product status with AEC-Q101 automotive qualification, providing design continuity and long-term availability. The extended operating temperature range (-55 to 150°C) exceeds the original SK35A-TP specification, offering improved thermal margin. Forward voltage performance (700 mV @ 3A) is superior to the original part, reducing power dissipation. RoHS3 compliance and unlimited moisture sensitivity level (MSL 1) align with current manufacturing standards.

Alternative Parametric Equivalent: SK35A-LTP (Micro Commercial Co)

The SK35A-LTP provides identical electrical specifications to the SK35A-TP with matching 50V/3A ratings and forward voltage characteristics. However, this part carries a "Not For New Designs" status, limiting its suitability for new development. It remains available for legacy system support and repair applications where exact parameter matching is required.

Functional Substitutes for 40V Applications: CDBA340-HF, MBRA340T3G, SBR3A40SAQ-13

These parts are suitable for applications where the circuit design operates at or below 40V reverse voltage. Each offers distinct performance characteristics:

CDBA340-HF (Comchip Technology): Active status, 40V/3A rating, 500 mV forward voltage, fast recovery speed. Maintains identical capacitance specification (250pF @ 4V, 1MHz) to the original part.
MBRA340T3G (onsemi): Active status, 40V/3A rating, superior forward voltage performance (450 mV @ 3A), reduced reverse leakage (300 µA @ 40V). Extended temperature range (-55 to 150°C) provides thermal margin.
SBR3A40SAQ-13 (Diodes Incorporated): Active status with AEC-Q101 automotive qualification, 40V/3A rating, 480 mV forward voltage. Employs Super Barrier technology with standard recovery speed (>500ns). Extended temperature range (-65 to 150°C) supports demanding thermal environments.

Not Recommended: XBS204V19R-G, RB058L-40TE25

The XBS204V19R-G has reduced current capacity (2A versus 3A required), making it unsuitable for direct substitution. The RB058L-40TE25 carries "Not For New Designs" status and lacks complete temperature range specification, limiting its applicability for new development.

Frequently Asked Questions (FAQ)

Q: Can the SK35A-TP be directly replaced with a 40V-rated diode?

A: Direct replacement with a 40V-rated diode is permissible only if the circuit design operates exclusively at or below 40V reverse voltage. The SK35A-TP is rated for 50V operation. If the application requires the full 50V capability, only 50V-rated substitutes (B350A-13-F or SK35A-LTP) are appropriate. Verify circuit maximum reverse voltage before selecting a 40V substitute.

Q: What is the difference between Fast Recovery and Standard Recovery speed classifications?

A: Fast Recovery diodes (≤ 500ns) exhibit shorter reverse recovery time, enabling higher switching frequencies and reduced switching losses. Standard Recovery diodes (>500ns) have longer recovery times, limiting their use in high-frequency applications. The SK35A-TP specifies Fast Recovery. The SBR3A40SAQ-13 substitute uses Standard Recovery technology and is suitable only for applications where switching frequency does not require fast recovery performance.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 compliance, aligning with current environmental and regulatory requirements. The SK35A-TP original part is also ROHS3 compliant.

Q: What does "Not For New Designs" product status mean?

A: Parts designated "Not For New Designs" are in production but manufacturers recommend against their use in new circuit designs. These parts remain available for legacy system support, repair, and maintenance. For new development, select parts with "Active" product status to ensure long-term availability and manufacturer support.

Q: How do forward voltage differences affect circuit performance?

A: Forward voltage (Vf) directly impacts power dissipation and voltage drop across the diode. Lower forward voltage reduces heat generation and improves efficiency. The B350A-13-F (700 mV) and CDBA340-HF (500 mV) exhibit different forward voltage characteristics. In high-current applications, the 200 mV difference between these parts results in measurable power dissipation variation. Select based on thermal budget and efficiency requirements.

Q: Can I use a diode with lower reverse leakage current than the original?

A: Yes. Lower reverse leakage current (Ir) is a performance improvement. The MBRA340T3G (300 µA @ 40V) and RB058L-40TE25 (5 µA @ 40V) exhibit significantly lower leakage than the SK35A-TP (500 µA @ 50V). This reduces standby power consumption and improves circuit performance in low-power applications.

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

A: Operating temperature range defines the thermal environment in which the component functions reliably. The SK35A-TP operates from -50 to 125°C. Substitutes with extended ranges (such as B350A-13-F at -55 to 150°C) provide additional thermal margin and suitability for demanding environments. Verify that the substitute's temperature range encompasses the application's operating conditions.

Q: Are automotive-qualified parts (AEC-Q101) required for all applications?

A: AEC-Q101 qualification is required for automotive and safety-critical applications. The B350A-13-F and SBR3A40SAQ-13 carry this qualification. For non-automotive applications, AEC-Q101 qualification is not mandatory but indicates enhanced reliability testing and quality assurance.

Q: What packaging format differences exist between substitutes?

A: All substitute parts use DO-214AC (SMA) surface mount packaging, maintaining mechanical and thermal compatibility with the SK35A-TP. Packaging format differences (Tape & Reel versus Cut Tape & Digi-Reel) affect procurement and handling but do not impact electrical performance or PCB assembly compatibility.

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