SK33A-LTP Equivalent & Substitute Parts

Part Overview

The SK33A-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 30V DC reverse voltage and 3A average rectified current in a DO-214AC (SMA) surface mount package. This component is classified as "Not For New Designs," indicating it has been superseded in the manufacturer's product line. Identifying equivalent and substitute parts is necessary for design continuity, inventory management, and sourcing alternatives that maintain electrical and mechanical compatibility.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	mV
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns
Current - Reverse Leakage @ Vr	500	µA @ 30 V
Capacitance @ Vr, F	250	pF @ 4V, 1MHz
Package / Case	DO-214AC, SMA	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-50 to 125	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SK33A-LTP is determined by the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): Must equal or exceed 30V
Current - Average Rectified (Io): Must equal or exceed 3A
Package / Case: Must be DO-214AC (SMA) or compatible surface mount package
Technology: Schottky rectifier diode
Mounting Type: Surface Mount

Secondary Compatibility Factors:

Voltage - Forward (Vf) (Max): Operating point compatibility at rated current
Speed: Fast Recovery characteristic (≤ 500ns, > 200mA)
Operating Temperature Range: Must accommodate application requirements
RoHS Compliance: ROHS3 Compliant status for regulatory alignment

Substitute parts are grouped into two categories:

Direct Equivalents (3A Rating): Parts meeting or exceeding all primary criteria with 3A current rating and compatible package specifications.

Functional Alternatives (Lower Current Rating): Parts with reduced current ratings (1A or 2A) that may be used in applications where the full 3A capacity is not required, provided circuit design accommodates the lower current limit.

Parameter Comparison

Part Number	Manufacturer	Vr (Max)	Io	Vf (Max) @ If	Package	Technology	Temp Range	Product Status
SK33A-LTP	Micro Commercial Co	30V	3A	500 mV @ 3A	DO-214AC (SMA)	Schottky	-50 to 125°C	Not For New Designs
B330A-13-F	Diodes Incorporated	30V	3A	500 mV @ 3A	DO-214AC (SMA)	Schottky	-55 to 150°C	Active
PMEG3030BEP,115	Nexperia USA Inc.	30V	3A	450 mV @ 3A	SOD-128	Schottky	—	Active
RSX301L-30TE25	Rohm Semiconductor	30V	3A	420 mV @ 3A	DO-214AC (SMA)	Schottky	—	Not For New Designs
B130L-13-F	Diodes Incorporated	30V	1A	410 mV @ 1A	DO-214AC (SMA)	Schottky	-55 to 125°C	Active
B230A-13-F	Diodes Incorporated	30V	2A	500 mV @ 2A	DO-214AC (SMA)	Schottky	-65 to 150°C	Active
MBRA130LT3G	onsemi	30V	1A	410 mV @ 1A	DO-214AC (SMA)	Schottky	-55 to 125°C	Active
SBR2U30SA-13	Diodes Incorporated	30V	2A	400 mV @ 2A	DO-214AC (SMA)	Super Barrier	-65 to 150°C	Active
SS13	Fairchild Semiconductor	30V	1A	500 mV @ 1A	DO-214AC (SMA)	Schottky	-65 to 125°C	Active
STPS130A	STMicroelectronics	30V	1A	550 mV @ 1A	DO-214AC (SMA)	Schottky	—	Active

Engineering Selection Recommendations

Direct Equivalent (Recommended Primary Substitute):

The B330A-13-F from Diodes Incorporated is the primary direct equivalent to the SK33A-LTP. It matches all critical electrical parameters (30V, 3A, 500 mV forward voltage at 3A) and maintains the DO-214AC (SMA) package specification. The B330A-13-F carries Active product status and includes AEC-Q101 automotive qualification, providing enhanced reliability assurance. The extended operating temperature range (-55 to 150°C) exceeds the original part specification. This part is suitable for direct replacement in new designs and existing applications.

Alternative 3A Equivalent (Package Variation):

The PMEG3030BEP,115 from Nexperia USA Inc. provides 3A capacity with improved forward voltage characteristics (450 mV @ 3A). However, this part uses a SOD-128 package rather than DO-214AC (SMA), requiring PCB layout modification. This substitution is applicable only when package footprint changes are acceptable.

Reduced Current Alternatives (2A Rating):

The B230A-13-F from Diodes Incorporated and SBR2U30SA-13 from Diodes Incorporated both provide 2A current capacity in the DO-214AC (SMA) package. These parts are suitable for applications where circuit design permits operation at 2A maximum current. The SBR2U30SA-13 employs Super Barrier technology with lower forward voltage (400 mV @ 2A) and extended temperature range (-65 to 150°C).

Reduced Current Alternatives (1A Rating):

The B130L-13-F from Diodes Incorporated, MBRA130LT3G from onsemi, SS13 from Fairchild Semiconductor, and STPS130A from STMicroelectronics all provide 1A current capacity in the DO-214AC (SMA) package. These parts are applicable only in circuits designed for 1A maximum current operation. All maintain 30V reverse voltage rating and fast recovery characteristics.

Obsolete Status Consideration:

The RSX301L-30TE25 from Rohm Semiconductor carries "Not For New Designs" status, similar to the SK33A-LTP. While electrically compatible at 30V/3A, this part should not be selected for new designs due to its obsolescence classification.

Frequently Asked Questions (FAQ)

Q: Can the B330A-13-F directly replace the SK33A-LTP without circuit modification?

A: Yes. The B330A-13-F matches all critical electrical parameters (30V reverse voltage, 3A average rectified current, 500 mV forward voltage at 3A) and uses the identical DO-214AC (SMA) package. No circuit modification is required for direct substitution.

Q: What is the difference between the SK33A-LTP and PMEG3030BEP,115?

A: Both parts are rated for 30V/3A operation. The primary difference is package type: SK33A-LTP uses DO-214AC (SMA), while PMEG3030BEP,115 uses SOD-128. The PMEG3030BEP,115 also exhibits lower forward voltage (450 mV vs. 500 mV at 3A). Package change requires PCB layout modification.

Q: Can I use a 1A or 2A rated part instead of the 3A SK33A-LTP?

A: Substitution with lower current-rated parts (1A or 2A) is possible only if circuit design analysis confirms that maximum current requirements do not exceed the substitute part's rating. The application must operate within the reduced current limit. This substitution requires circuit validation.

Q: Why is the SK33A-LTP marked "Not For New Designs"?

A: This designation indicates the part has been superseded by the manufacturer and is no longer recommended for new product development. Existing inventory may remain available, but new designs should specify active alternatives such as B330A-13-F.

Q: Are all substitute parts RoHS3 compliant?

A: All listed substitute parts carry RoHS3 Compliant status, matching the original SK33A-LTP specification. This ensures regulatory alignment for applications requiring RoHS compliance.

Q: What is the temperature operating range difference between SK33A-LTP and B330A-13-F?

A: The SK33A-LTP operates from -50 to 125°C junction temperature. The B330A-13-F extends this range to -55 to 150°C, providing broader thermal operating capability. Both ranges are suitable for standard industrial and commercial applications.

Q: Does package type affect electrical performance?

A: Package type (DO-214AC vs. SOD-128) does not affect electrical performance characteristics. However, package selection impacts PCB layout, thermal dissipation, and manufacturing compatibility. Substitutions requiring package changes necessitate PCB redesign.

Q: What is the difference between Schottky and Super Barrier technology in these parts?

A: Both technologies are fast recovery rectifier types suitable for the same voltage and current ratings. The SBR2U30SA-13 employs Super Barrier technology, which typically offers lower forward voltage drop (400 mV @ 2A) compared to standard Schottky devices. Technology selection depends on application power dissipation requirements.

Q: Can I mix different substitute parts in the same circuit?

A: Yes, provided all parts meet the circuit's voltage and current requirements. However, mixing parts with different forward voltage characteristics may result in unequal current distribution in parallel configurations. Circuit design should account for forward voltage variations among selected parts.

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