SK33B-LTP Equivalent & Substitute Parts

Part Overview

The SK33B-LTP is a Schottky rectifier diode manufactured by Micro Commercial Co, rated for 30 V DC reverse voltage and 3 A average rectified current in a DO-214AA (SMB) surface mount package. This part is classified as "Not For New Designs," indicating it has reached end-of-life status. Equivalent and substitute parts are necessary to support existing designs, provide design flexibility, and ensure supply chain continuity for applications requiring 30 V, 3 A Schottky diode functionality in surface mount form factor.

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
Package / Case	DO-214AA, SMB	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55°C ~ 150°C	°C
Technology	Schottky	—

Substitute Part Grouping Explanation

Substitution of the SK33B-LTP is determined by the following critical parameters:

Voltage Rating: All substitute parts must maintain a DC reverse voltage rating of 30 V or higher to ensure safe operation in the same circuit topology.

Current Rating: Substitute parts are grouped by average rectified current capacity. Parts rated for 3 A provide direct equivalence. Parts rated for 2 A or 1 A represent current-limited alternatives suitable only for applications where the full 3 A capacity is not required.

Package Type: The DO-214AA (SMB) package is the primary form factor. One substitute part (PMEG3030BEP,115) uses SOD-128 packaging, which differs in physical dimensions and PCB footprint, requiring layout modification.

Forward Voltage: Forward voltage drop at rated current varies across substitutes. Lower forward voltage (445 mV at 2 A or 3 A) indicates improved efficiency; higher forward voltage (600 mV at 1 A) indicates increased power dissipation.

Reverse Leakage Current: Leakage current ranges from 150 µA to 1 mA at 30 V. Lower leakage improves standby power consumption and circuit performance in high-impedance applications.

RoHS Compliance: Substitutes are available in both RoHS3-compliant and non-compliant versions. Design requirements determine compliance necessity.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Io (A)	Vf (Max) @ If	Vr (Max) (V)	Ir @ Vr (µA)	Package	Tj (°C)	RoHS Status	Product Status
SK33B-LTP	Micro Commercial Co	3	500 mV @ 3 A	30	500 @ 30 V	DO-214AA, SMB	-55 ~ 150	ROHS3 Compliant	Not For New Designs
5818SMJ/TR13	Microchip Technology	1	550 mV @ 1 A	30	1000 @ 30 V	DO-214AA, SMB	-55 ~ 150	RoHS non-compliant	Active
B130B-13-F	Diodes Incorporated	1	500 mV @ 1 A	30	500 @ 30 V	DO-214AA, SMB	-65 ~ 150	ROHS3 Compliant	Active
B130LB-13-F	Diodes Incorporated	2	445 mV @ 2 A	30	1000 @ 30 V	DO-214AA, SMB	-55 ~ 125	ROHS3 Compliant	Active
B230-13-F	Diodes Incorporated	2	500 mV @ 2 A	30	500 @ 30 V	DO-214AA, SMB	-65 ~ 150	ROHS3 Compliant	Active
MBRS130LT3G	onsemi	2	445 mV @ 2 A	30	1000 @ 30 V	DO-214AA, SMB	-65 ~ 125	ROHS3 Compliant	Active
MBRS130T3G	onsemi	1	600 mV @ 1 A	30	1000 @ 30 V	DO-214AA, SMB	-65 ~ 125	ROHS3 Compliant	Active
MBRS230LT3G	onsemi	2	500 mV @ 2 A	30	1000 @ 30 V	DO-214AA, SMB	-55 ~ 125	ROHS3 Compliant	Active
PMEG3030BEP,115	Nexperia USA Inc.	3	450 mV @ 3 A	30	150 @ 30 V	SOD-128	-55 ~ 150	ROHS3 Compliant	Active
SK33B/TR13	Microsemi Corporation	3	500 mV @ 3 A	30	500 @ 30 V	DO-214AA, SMB	-55 ~ 125	RoHS non-compliant	Active
SS23	Taiwan Semiconductor Corporation	2	500 mV @ 2 A	30	400 @ 30 V	DO-214AA, SMB	-55 ~ 125	ROHS3 Compliant	Active

Engineering Selection Recommendations

Direct Equivalent (3 A Rating, DO-214AA Package):

SK33B/TR13 (Microsemi Corporation) provides functional equivalence with identical 3 A current rating, 500 mV forward voltage at 3 A, and DO-214AA package. This part is Active status. However, it is RoHS non-compliant, which may conflict with design requirements for new applications or regulated markets.

PMEG3030BEP,115 (Nexperia USA Inc.) provides 3 A current rating with superior electrical characteristics: 450 mV forward voltage (50 mV lower than SK33B-LTP) and 150 µA reverse leakage (lower than SK33B-LTP). This part is ROHS3 compliant and Active status. The SOD-128 package differs from DO-214AA, requiring PCB layout modification and footprint redesign.

Current-Limited Alternatives (2 A Rating, DO-214AA Package):

B130LB-13-F (Diodes Incorporated) and MBRS130LT3G (onsemi) both provide 2 A rating with 445 mV forward voltage at 2 A, representing improved efficiency. Both are ROHS3 compliant and Active status. These parts are suitable for applications where 3 A capacity is not required.

B230-13-F (Diodes Incorporated) and MBRS230LT3G (onsemi) provide 2 A rating with 500 mV forward voltage at 2 A, matching the SK33B-LTP forward voltage characteristic. Both are ROHS3 compliant and Active status.

SS23 (Taiwan Semiconductor Corporation) provides 2 A rating with 500 mV forward voltage at 2 A and 400 µA reverse leakage. This part is ROHS3 compliant and Active status.

Current-Limited Alternatives (1 A Rating, DO-214AA Package):

B130B-13-F (Diodes Incorporated) provides 1 A rating with 500 mV forward voltage at 1 A and 500 µA reverse leakage, matching SK33B-LTP leakage characteristics. This part is ROHS3 compliant and Active status.

5818SMJ/TR13 (Microchip Technology) provides 1 A rating with 550 mV forward voltage at 1 A. This part is RoHS non-compliant and Active status.

MBRS130T3G (onsemi) provides 1 A rating with 600 mV forward voltage at 1 A, indicating higher power dissipation. This part is ROHS3 compliant and Active status.

Compliance Considerations:

For applications requiring RoHS3 compliance, select from: B130B-13-F, B130LB-13-F, B230-13-F, MBRS130LT3G, MBRS130T3G, MBRS230LT3G, PMEG3030BEP,115, or SS23.

For applications with no RoHS requirement, 5818SMJ/TR13 and SK33B/TR13 are available as alternatives.

Temperature Range Considerations:

SK33B-LTP operates to 150°C junction temperature. Substitutes with identical or extended temperature range: B130B-13-F (-65 ~ 150°C), B230-13-F (-65 ~ 150°C), and PMEG3030BEP,115 (-55 ~ 150°C). Substitutes with reduced maximum temperature (125°C): B130LB-13-F, MBRS130LT3G, MBRS130T3G, MBRS230LT3G, SK33B/TR13, and SS23.

Frequently Asked Questions (FAQ)

Q: Can I use a 2 A rated diode in place of the 3 A SK33B-LTP?

A: A 2 A rated diode can be used only if the application circuit does not require the full 3 A capacity. The 2 A diode will operate safely at currents up to 2 A. If the circuit demands 3 A, a 2 A substitute will exceed its current rating and may fail. Verify actual circuit current requirements before substitution.

Q: What is the difference between DO-214AA and SOD-128 packages?

A: DO-214AA (SMB) and SOD-128 are different physical packages with different PCB footprints, lead spacing, and mounting dimensions. PMEG3030BEP,115 uses SOD-128 packaging, which is not pin-compatible with DO-214AA. Substitution requires PCB layout redesign and footprint modification.

Q: Why does forward voltage vary across substitute parts?

A: Forward voltage is a material and design characteristic of the Schottky junction. Lower forward voltage (445 mV) indicates improved efficiency and lower power dissipation compared to higher forward voltage (600 mV). Selection depends on thermal budget and efficiency requirements of the application.

Q: Is RoHS compliance mandatory for all substitutes?

A: RoHS compliance is mandatory only if the application or end market requires it. For consumer electronics sold in the European Union, RoHS3 compliance is required. For other applications, non-compliant parts may be acceptable. Verify regulatory requirements for your specific application.

Q: Can I substitute SK33B-LTP with SK33B/TR13?

A: SK33B/TR13 provides identical electrical specifications and current rating (3 A). Both parts use the same DO-214AA package. However, SK33B/TR13 is RoHS non-compliant, while SK33B-LTP is ROHS3 compliant. Substitution is electrically valid but may violate compliance requirements depending on application.

Q: What does "Not For New Designs" mean for SK33B-LTP?

A: "Not For New Designs" indicates the part has reached end-of-life status and the manufacturer no longer recommends it for new product development. Existing designs may continue to use available inventory, but new designs should select from Active status alternatives such as SK33B/TR13, PMEG3030BEP,115, or other listed substitutes.

Q: How do I choose between multiple 2 A alternatives?

A: Compare forward voltage, reverse leakage, temperature range, and compliance status. B130LB-13-F and MBRS130LT3G offer 445 mV forward voltage (lower power dissipation). B230-13-F and MBRS230LT3G offer 500 mV forward voltage (matching SK33B-LTP). SS23 offers 400 µA reverse leakage (lower standby current). All are ROHS3 compliant and Active status.

Q: What is reverse leakage current and why does it matter?

A: Reverse leakage current is the small current that flows through the diode when reverse biased. Lower leakage reduces standby power consumption and improves performance in high-impedance circuits. SK33B-LTP has 500 µA leakage; PMEG3030BEP,115 has 150 µA (lower), while some alternatives have 1000 µA (higher).

Q: Can I use PMEG3030BEP,115 as a direct replacement?

A: PMEG3030BEP,115 provides superior electrical performance (3 A rating, 450 mV forward voltage, 150 µA leakage) and is ROHS3 compliant. However, it uses SOD-128 packaging instead of DO-214AA, requiring PCB footprint redesign. Electrical substitution is valid; physical substitution requires layout modification.

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