SK13-13 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK13-13 is a 30V, 1A Schottky rectifier diode manufactured by Diodes Incorporated in a Surface Mount SMB (DO-214AA) package. This component is classified as discontinued at DiGi Electronics, indicating that direct procurement of the original part number is no longer available through primary distribution channels. The part operates across a junction temperature range of -65°C to 125°C and carries a RoHS non-compliant status with unlimited moisture sensitivity rating (MSL 1).

Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and rectification applications where low forward voltage drop and fast switching characteristics are required. The discontinuation of the SK13-13 necessitates identification of functionally equivalent alternatives that maintain electrical performance within the original design specifications.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	1	A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 30 V
Capacitance @ Vr, F	110	pF @ 4V, 1MHz
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-65 to 125	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SK13-13 is determined by strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Mandatory Matching Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 30V
Current - Average Rectified (Io): Must equal or exceed 1A
Technology: Must be Schottky diode type
Mounting Type: Must be Surface Mount
Package / Case: Must be compatible with DO-214AA, SMB footprint or equivalent surface mount package

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max) @ If: Lower values indicate improved efficiency; values at or below 550 mV @ 1A are acceptable
Current - Reverse Leakage @ Vr: Lower values indicate superior performance; values at or below 500 µA @ 30V are acceptable
Speed: Must maintain Fast Recovery characteristic (≤ 500ns, > 200mA)
Operating Temperature Range: Must accommodate the application's thermal requirements

Substitute parts are grouped into two categories based on current rating:

Category 1 - Direct Current Rating Match (1A): Parts with 1A average rectified current maintain identical current handling capacity to the original SK13-13.

Category 2 - Higher Current Rating (2A, 3A, 4A): Parts with current ratings exceeding 1A provide electrical headroom and are suitable for applications where the original 1A specification is not a limiting constraint. These parts maintain the same 30V reverse voltage rating and fast recovery characteristics.

Parameter Comparison

Parameter	SK13-13	PMEG3010EP,115	SK33B-LTP	SK43BL-TP	SS23	STPS130U	STPS1L30U
Manufacturer	Diodes Inc.	Nexperia USA Inc.	Micro Commercial Co	Micro Commercial Co	Taiwan Semiconductor	STMicroelectronics	Vishay General Semiconductor
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	1 A	1 A	3 A	4 A	2 A	1 A	1 A
Voltage - Forward (Vf) (Max) @ If	550 mV @ 1 A	360 mV @ 1 A	500 mV @ 3 A	450 mV @ 4 A	500 mV @ 2 A	550 mV @ 1 A	420 mV @ 1 A
Speed	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA	Fast Recovery ≤ 500ns, > 200mA
Current - Reverse Leakage @ Vr	500 µA @ 30 V	1.5 mA @ 30 V	500 µA @ 30 V	500 µA @ 30 V	400 µA @ 30 V	10 µA @ 30 V	200 µA @ 30 V
Package / Case	DO-214AA, SMB	SOD-128	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB	DO-214AA, SMB
Operating Temperature - Junction	-65 to 125°C	150°C (Max)	-55 to 150°C	-55 to 150°C	-55 to 125°C	150°C (Max)	-55 to 150°C
Product Status	Discontinued	Active	Not For New Designs	Not For New Designs	Active	Active	Obsolete
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Non-compliant

Engineering Selection Recommendations

Primary Recommendation - Direct Replacement (1A Current Rating):

STPS130U (STMicroelectronics) is the preferred substitute for the SK13-13. This part maintains identical electrical specifications (30V, 1A, 550 mV forward voltage @ 1A, fast recovery ≤ 500ns) and is housed in the same DO-214AA SMB package. The STPS130U carries Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The part demonstrates superior reverse leakage performance (10 µA @ 30V versus 500 µA @ 30V), resulting in lower standby current consumption. Operating temperature maximum of 150°C provides thermal margin for demanding applications.

Secondary Recommendation - Direct Replacement with Enhanced Performance:

STPS1L30U (Vishay General Semiconductor - Diodes Division) provides identical voltage and current ratings in the DO-214AA SMB package with improved forward voltage characteristics (420 mV @ 1A versus 550 mV @ 1A). This reduction in forward voltage drop results in lower power dissipation and improved circuit efficiency. The part supports an extended operating temperature range (-55°C to 150°C) and demonstrates moderate reverse leakage (200 µA @ 30V). However, the STPS1L30U carries Obsolete product status and RoHS non-compliant classification, limiting suitability for new design implementations or applications requiring regulatory compliance.

Alternative Recommendation - Higher Current Capacity:

SS23 (Taiwan Semiconductor Corporation) offers 2A average rectified current in the DO-214AA SMB package with 30V reverse voltage rating. This part is Active with ROHS3 compliance and provides electrical headroom for applications where 1A capacity is marginal. Forward voltage is maintained at 500 mV @ 2A, and reverse leakage is 400 µA @ 30V. Operating temperature range of -55°C to 125°C is suitable for standard industrial applications.

Package Variant Recommendation - SOD-128 Package:

PMEG3010EP,115 (Nexperia USA Inc.) provides 30V, 1A specifications in a SOD-128/CFP5 surface mount package. This part is Active with ROHS3 compliance and demonstrates superior forward voltage performance (360 mV @ 1A). The SOD-128 package is physically smaller than DO-214AA SMB, enabling space-constrained designs. This option requires PCB layout modification to accommodate the different footprint. Operating temperature maximum of 150°C and reverse leakage of 1.5 mA @ 30V are within acceptable parameters.

Not Recommended for New Designs:

SK33B-LTP and SK43BL-TP carry "Not For New Designs" product status and should not be selected for new circuit implementations. STPS1L30U is classified as Obsolete and carries RoHS non-compliant status, making it unsuitable for applications requiring regulatory compliance or long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can the SK13-13 be directly replaced with STPS130U without circuit modification?

A: Yes. The STPS130U maintains identical electrical specifications (30V reverse voltage, 1A average rectified current, 550 mV forward voltage @ 1A, fast recovery ≤ 500ns) and is housed in the same DO-214AA SMB package. No circuit modification is required. The footprint and pin configuration are identical, enabling direct PCB substitution.

Q: What is the difference between the SK13-13 and STPS1L30U?

A: Both parts share identical voltage (30V) and current (1A) ratings in the DO-214AA SMB package. The STPS1L30U offers improved forward voltage performance (420 mV @ 1A versus 550 mV @ 1A), resulting in lower power dissipation. However, the STPS1L30U is classified as Obsolete with RoHS non-compliant status, limiting its use in new designs or applications requiring regulatory compliance. For new implementations, STPS130U is the preferred choice.

Q: Why is PMEG3010EP,115 listed as a substitute if it uses a different package (SOD-128)?

A: The PMEG3010EP,115 is electrically equivalent to the SK13-13 (30V, 1A, Schottky technology, fast recovery) and is functionally suitable for applications where the original part is no longer available. However, the SOD-128 package differs from the DO-214AA SMB package, requiring PCB layout redesign and new footprint implementation. This option is appropriate for new circuit designs or redesigns where package optimization is beneficial. For direct board-level substitution without layout changes, DO-214AA SMB package alternatives (STPS130U, SS23, SK33B-LTP, SK43BL-TP) are required.

Q: Can I use SS23 (2A) or SK33B-LTP (3A) in place of the SK13-13 (1A)?

A: Yes. Both SS23 and SK33B-LTP maintain the 30V reverse voltage rating and fast recovery characteristics. The higher current ratings (2A and 3A respectively) provide electrical headroom and are suitable for applications where the original 1A specification is not a limiting constraint. These parts are housed in the same DO-214AA SMB package and require no circuit modification. However, verify that the application does not depend on the 1A current rating as a design constraint. SS23 is Active with ROHS3 compliance; SK33B-LTP carries "Not For New Designs" status.

Q: What is the significance of the "Fast Recovery ≤ 500ns, > 200mA" specification?

A: This specification indicates that all substitute parts maintain the same switching speed characteristic as the original SK13-13. Fast recovery Schottky diodes exhibit reduced reverse recovery time (≤ 500ns), enabling efficient operation in high-frequency switching applications. The "> 200mA" qualifier indicates this recovery time specification applies at forward currents exceeding 200mA. All listed substitutes meet this requirement, ensuring compatibility in switching power supply and rectification circuits.

Q: Why does STPS130U show lower reverse leakage (10 µA) compared to the SK13-13 (500 µA)?

A: Lower reverse leakage current indicates superior diode quality and reduced standby power consumption. The STPS130U's 10 µA reverse leakage at 30V is significantly lower than the SK13-13's 500 µA, resulting in decreased quiescent current draw in powered-down or standby states. This improvement is a benefit of more modern manufacturing processes and does not affect forward conduction characteristics. The lower leakage is compatible with all applications designed for the SK13-13.

Q: Is the SK13-13 RoHS non-compliant status a concern for substitution?

A: The SK13-13's RoHS non-compliant status reflects its manufacturing date and regulatory environment at production. For new designs or applications requiring RoHS compliance, substitute parts with ROHS3 compliant status (STPS130U, SS23, SK33B-LTP, SK43BL-TP, PMEG3010EP,115) are required. These alternatives meet current regulatory requirements while maintaining electrical equivalence. For legacy system repairs or applications without compliance requirements, RoHS status is not a technical constraint.

Q: What is the operating temperature difference between SK13-13 (-65°C to 125°C) and STPS130U (150°C max)?

A: The SK13-13 specifies a junction temperature range of -65°C to 125°C, while STPS130U specifies a maximum junction temperature of 150°C. The STPS130U's higher maximum temperature provides thermal margin for high-power or thermally constrained applications. Both parts operate across the full -65°C to 125°C range required by the original SK13-13 specification. The STPS130U's extended upper limit does not affect compatibility; it represents an improvement for applications approaching thermal limits.

Q: Can I use PMEG3010EP,115 in a design that requires the DO-214AA SMB package?

A: No. The PMEG3010EP,115 uses a SOD-128/CFP5 package, which has a different footprint and pin configuration than the DO-214AA SMB package. Direct PCB substitution is not possible without layout redesign. If the original design requires the DO-214AA SMB package form factor, select STPS130U, SS23, SK33B-LTP, or SK43BL-TP instead. The PMEG3010EP,115 is suitable only for new circuit designs where package optimization is acceptable.

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