SK13-TP Equivalent & Substitute Parts

Part Overview

The SK13-TP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 30 V DC reverse voltage and 1 A average rectified current in a DO-214AA (HSMB) surface mount package. This part is classified as obsolete, making equivalent and substitute components necessary for ongoing design support and procurement.

The SK13-TP serves as a fast recovery Schottky diode suitable for applications requiring low forward voltage drop and rapid switching characteristics. Equivalent parts maintain identical electrical specifications, while substitute parts offer compatible performance within defined parameter tolerances for the same application category.

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
Mounting Type	Surface Mount	—
Package / Case	DO-214AA, SMB	—
Operating Temperature - Junction	-55 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK13-TP is determined by the following critical parameters:

Mandatory Matching Parameters:

Voltage - DC Reverse (Vr) (Max): 30 V
Technology: Schottky
Mounting Type: Surface Mount
Package / Case: DO-214AA or SMB equivalent
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)

Allowable Variation Parameters:

Current - Average Rectified (Io): 1 A minimum (higher ratings acceptable for same voltage class)
Voltage - Forward (Vf) (Max) @ If: 500–600 mV range at rated current
Current - Reverse Leakage @ Vr: 500 µA to 1 mA at 30 V
Operating Temperature - Junction: -55°C minimum to 125°C minimum

Parts are grouped as parametric equivalents when all electrical specifications match within stated tolerances. Parts are grouped as similar substitutes when they maintain the same voltage and current ratings with acceptable forward voltage and leakage variations, provided they retain the same package footprint and thermal characteristics.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Ir @ Vr [µA]	Package	Temp Range [°C]	Product Status	RoHS Status
SK13-TP	Micro Commercial Co	30	1	550 @ 1A	500 @ 30V	DO-214AA, HSMB	-55 to 125	Obsolete	ROHS3 Compliant
SK13-TP (SMB5818)	Micro Commercial Co	30	1	550 @ 1A	500 @ 30V	DO-214AA, HSMB	-55 to 125	Active	ROHS3 Compliant
5818SMJ/TR13	Microchip Technology	30	1	550 @ 1A	1000 @ 30V	DO-214AA, SMB	-55 to 150	Active	RoHS non-compliant
B130B-13-F	Diodes Incorporated	30	1	500 @ 1A	500 @ 30V	DO-214AA, SMB	-65 to 150	Active	ROHS3 Compliant
B330B-13-F	Diodes Incorporated	30	3	500 @ 3A	500 @ 30V	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
MBRS130T3G	onsemi	30	1	600 @ 1A	1000 @ 30V	DO-214AA, SMB	-65 to 125	Active	ROHS3 Compliant
STPS130U	STMicroelectronics	30	1	550 @ 1A	10 @ 30V	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
VS-20BQ030HM3/5BT	Vishay General Semiconductor - Diodes Division	30	2	470 @ 2A	500 @ 30V	DO-214AA, SMB	-55 to 150	Active	ROHS3 Compliant
SK13	Good-Ark Semiconductor	30	1	500 @ 1A	500 @ 30V	DO-214AC, SMA	-55 to 150	Active	ROHS3 Compliant

Engineering Selection Recommendations

Parametric Equivalent (Direct Replacement):

SK13-TP (SMB5818) from Micro Commercial Co is the parametric equivalent with active product status. This part maintains identical electrical specifications and package designation, offering direct substitution for the obsolete SK13-TP. The active status ensures ongoing availability and supply chain continuity.

Primary Substitutes (1 A Rating, 30 V Class):

B130B-13-F (Diodes Incorporated), STPS130U (STMicroelectronics), and MBRS130T3G (onsemi) are active substitutes rated for 1 A at 30 V in DO-214AA/SMB packages. All three maintain ROHS3 compliance. B130B-13-F offers the lowest forward voltage (500 mV @ 1 A) and extended temperature range (-65°C to 150°C). STPS130U provides the lowest reverse leakage current (10 µA @ 30 V). MBRS130T3G operates to 125°C maximum junction temperature, matching the original SK13-TP thermal limit.

Higher Current Substitutes (2–3 A Rating, 30 V Class):

VS-20BQ030HM3/5BT (Vishay) and B330B-13-F (Diodes Incorporated) are rated for 2 A and 3 A respectively at 30 V. These parts are suitable for applications requiring higher current capacity within the same voltage class. Both carry automotive qualification (AEC-Q101) and ROHS3 compliance. VS-20BQ030HM3/5BT exhibits lower forward voltage (470 mV @ 2 A), beneficial for efficiency-sensitive applications.

Alternative Package Consideration:

SK13 from Good-Ark Semiconductor is a parametric equivalent in DO-214AC (SMA) package rather than DO-214AA (SMB). This part is suitable only if the PCB layout accommodates the SMA footprint. The SMA package is physically smaller than SMB and requires different land pattern design.

Compliance and Regulatory Status:

All recommended substitutes except 5818SMJ/TR13 (Microchip Technology) maintain ROHS3 compliance. The 5818SMJ/TR13 is RoHS non-compliant and should be selected only when legacy system requirements mandate its use. All parts carry REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can SK13-TP be directly replaced with SK13-TP (SMB5818)?

A: Yes. SK13-TP (SMB5818) is a parametric equivalent with identical electrical specifications and package designation. The active product status of SMB5818 makes it the recommended direct replacement for the obsolete SK13-TP.

Q: What is the difference between DO-214AA and SMB package designations?

A: DO-214AA and SMB refer to the same physical package outline. Both designations describe a surface mount rectifier package with identical footprint and thermal characteristics. The terms are used interchangeably by different manufacturers.

Q: Can B330B-13-F (3 A) be used in place of SK13-TP (1 A)?

A: Yes, with design verification. B330B-13-F is rated for 3 A at 30 V, exceeding the 1 A requirement of SK13-TP. The higher current rating does not prevent operation at lower currents. However, the increased capacitance (200 pF @ 4 V, 1 MHz versus unspecified for SK13-TP) may affect high-frequency switching performance. Circuit simulation or testing is necessary to confirm compatibility in frequency-sensitive applications.

Q: What is the significance of reverse leakage current variation among substitutes?

A: Reverse leakage current ranges from 10 µA (STPS130U) to 1 mA (5818SMJ/TR13, MBRS130T3G) at 30 V. Lower leakage reduces standby power consumption and heat generation. Applications with stringent power budget requirements benefit from STPS130U. Standard applications tolerate the higher leakage of alternative parts without performance degradation.

Q: Are all substitutes suitable for automotive applications?

A: B330B-13-F and VS-20BQ030HM3/5BT carry AEC-Q101 automotive qualification. SK13 (Good-Ark) also carries AEC-Q101 qualification. Other substitutes lack explicit automotive qualification but maintain ROHS3 compliance. Automotive system designs require parts with AEC-Q101 certification; non-qualified parts are unsuitable for automotive use regardless of other specifications.

Q: What is the impact of forward voltage differences on circuit performance?

A: Forward voltage ranges from 470 mV (VS-20BQ030HM3/5BT @ 2 A) to 600 mV (MBRS130T3G @ 1 A). Lower forward voltage reduces power dissipation and improves efficiency. In low-voltage applications (below 5 V), forward voltage drop becomes significant relative to supply voltage. High-efficiency designs benefit from parts with lower forward voltage. Standard rectification applications tolerate the full range without functional impact.

Q: Can SK13 (DO-214AC, SMA) be used on a PCB designed for SK13-TP (DO-214AA, SMB)?

A: No. DO-214AC (SMA) and DO-214AA (SMB) have different physical footprints and land patterns. PCB layout modification is required to accommodate the SMA package. Direct substitution on existing PCB layouts is not possible without redesign.

Q: What is the operating temperature range consideration for substitution?

A: SK13-TP operates from -55°C to 125°C. Most substitutes extend the upper limit to 150°C. Applications operating within the -55°C to 125°C range are compatible with all substitutes. Applications requiring operation above 125°C are limited to substitutes with 150°C maximum ratings. MBRS130T3G maintains the 125°C maximum of the original part.

Q: Is RoHS compliance a mandatory substitution criterion?

A: ROHS3 compliance is mandatory for new designs and most procurement specifications. All recommended substitutes except 5818SMJ/TR13 maintain ROHS3 compliance. Legacy system repairs or non-regulated applications may permit use of RoHS non-compliant parts. Verify compliance requirements with design specifications and procurement policy before part selection.

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