SK33B-TP Schottky Diode Equivalent & Substitute Parts

Part Overview

The SK33B-TP is a 30V, 3A Schottky rectifier diode manufactured by Micro Commercial Co in the DO-214AA (SMB) surface mount package. This component is classified as obsolete, necessitating identification of equivalent and substitute parts for ongoing production and design requirements. Schottky diodes in this voltage and current class are widely used in power supply circuits, reverse polarity protection, and high-frequency rectification applications where fast recovery characteristics are essential.

Key Parameters

Parameter	Value	Unit
Voltage - DC Reverse (Vr) Maximum	30	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) Maximum @ If	500 mV @ 3 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 SK33B-TP is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 30V
Current - Average Rectified (Io): 3A
Voltage - Forward (Vf) Maximum @ If: 500 mV @ 3A
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Mounting Type: Surface Mount
Package / Case: DO-214AA (SMB)
Technology: Schottky

Secondary Compatibility Factors:

Operating Temperature Range: -55°C to 125°C minimum
RoHS3 Compliance
Current - Reverse Leakage @ Vr: 500 µA @ 30V (or lower)

Parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Substitutes: Parts from the same manufacturer (Micro Commercial Co) with identical electrical specifications and packaging, differing only in packaging format or product status.

Similar Manufacturer Parts: Parts from alternative manufacturers (Diodes Incorporated, onsemi, Fairchild Semiconductor) meeting all primary electrical and mechanical criteria with active product status.

Parametric Equivalents: Parts from multiple manufacturers (Microsemi Corporation, Taiwan Semiconductor Corporation, Panjit International Inc.) with identical core electrical specifications and surface mount DO-214AA packaging.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (mV)	Speed (ns)	Ir @ Vr (µA)	Package	Temp Range (°C)	Product Status	RoHS Status
SK33B-TP	Micro Commercial Co	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 125	Obsolete	ROHS3
SK33B-LTP	Micro Commercial Co	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 150	Not For New Designs	ROHS3
B330B-13-F	Diodes Incorporated	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 150	Active	ROHS3
MBRS230LT3G	onsemi	30	2	500 @ 2A	≤ 500	1000 @ 30V	DO-214AA (SMB)	-55 to 125	Active	ROHS3
SS33	Fairchild Semiconductor	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AB (SMC)	-55 to 150	Active	Not specified
SK33AE3/TR13	Microsemi Corporation	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 125	Active	ROHS3
SK33B	Taiwan Semiconductor Corporation	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 125	Active	ROHS3
SK33B/TR13	Microsemi Corporation	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 125	Active	RoHS non-compliant
SK33BE3/TR13	Microsemi Corporation	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 125	Active	ROHS3
SK33BH	Taiwan Semiconductor Corporation	30	3	500 @ 3A	≤ 500	500 @ 30V	DO-214AA (SMB)	-55 to 125	Active	ROHS3
SR33_R1_00001	Panjit International Inc.	30	3	500 @ 3A	≤ 500	200 @ 30V	DO-214AA (SMB)	-55 to 125	Active	ROHS3

Engineering Selection Recommendations

Tier 1 - Direct Replacement (Highest Compatibility):

The B330B-13-F (Diodes Incorporated) is the primary recommended substitute. This part maintains full electrical equivalence across all critical parameters, operates across an extended temperature range (-55°C to 150°C), carries active product status, and holds AEC-Q101 automotive qualification. ROHS3 compliance ensures regulatory alignment with the original SK33B-TP specification.

The SK33AE3/TR13, SK33BE3/TR13, and SK33BH from Microsemi Corporation and Taiwan Semiconductor Corporation are parametric equivalents with active product status and ROHS3 compliance. These parts are suitable for direct substitution in applications where the extended temperature range of the B330B-13-F is not required.

Tier 2 - Functional Substitutes (Conditional Use):

The SK33B-LTP (Micro Commercial Co) is a direct manufacturer variant with identical electrical specifications but carries "Not For New Designs" status. This part is suitable only for legacy system maintenance or repair applications where design continuity is required.

The SR33_R1_00001 (Panjit International Inc.) provides full electrical equivalence with the advantage of lower reverse leakage current (200 µA versus 500 µA at 30V). This characteristic may provide improved performance in low-leakage applications. Active product status and ROHS3 compliance support its use in new designs.

Tier 3 - Current-Reduced Substitute (Limited Application):

The MBRS230LT3G (onsemi) operates at 2A average rectified current, below the 3A specification of the SK33B-TP. This part is suitable only for applications where the actual operating current does not exceed 2A. All other electrical parameters remain equivalent. Active product status and ROHS3 compliance are maintained.

Package Consideration:

The SS33 (Fairchild Semiconductor) uses the DO-214AB (SMC) package instead of the DO-214AA (SMB) package. While electrically equivalent, the larger SMC package requires PCB layout modification and is not a direct mechanical substitute. This part is suitable only when PCB redesign is acceptable.

Compliance and Status:

All recommended Tier 1 and Tier 2 substitutes maintain ROHS3 compliance and REACH unaffected status. The SK33B/TR13 (Microsemi Corporation) is RoHS non-compliant and should be avoided in applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can the MBRS230LT3G replace the SK33B-TP in all applications?

A: The MBRS230LT3G is electrically equivalent but rated for 2A average rectified current versus the SK33B-TP's 3A rating. Substitution is valid only when the actual circuit operating current does not exceed 2A. Exceeding this current rating will result in component failure.

Q: What is the difference between SK33B-TP and SK33B-LTP?

A: Both parts are manufactured by Micro Commercial Co with identical electrical specifications and DO-214AA packaging. The primary difference is packaging format: SK33B-TP uses standard packaging while SK33B-LTP uses Tape & Reel format. SK33B-LTP carries "Not For New Designs" status, limiting its use to legacy applications.

Q: Is the SS33 a direct replacement for the SK33B-TP?

A: The SS33 is electrically equivalent but uses the DO-214AB (SMC) package instead of DO-214AA (SMB). The SMC package is physically larger and requires different PCB footprint and layout. Direct mechanical substitution is not possible without PCB redesign.

Q: Why does SR33_R1_00001 have lower reverse leakage current?

A: The SR33_R1_00001 specifies 200 µA reverse leakage at 30V compared to 500 µA for the SK33B-TP. This is a manufacturing characteristic variation within the Schottky diode technology. Lower leakage current may provide performance benefits in low-power or precision applications but does not affect basic substitution compatibility.

Q: Are all substitute parts ROHS3 compliant?

A: All recommended Tier 1 and Tier 2 substitutes are ROHS3 compliant except SK33B/TR13 (Microsemi Corporation), which is RoHS non-compliant. Verify compliance requirements for your specific application before selection.

Q: What is the temperature range difference between SK33B-TP and B330B-13-F?

A: The SK33B-TP operates from -55°C to 125°C junction temperature, while B330B-13-F extends to -55°C to 150°C. The extended upper temperature limit of B330B-13-F provides additional thermal margin in high-temperature environments but is not required for applications within the original -55°C to 125°C range.

Q: Can I use SK33B-LTP in new product designs?

A: SK33B-LTP carries "Not For New Designs" status from the manufacturer. While electrically suitable, this designation indicates the manufacturer does not recommend its use in new designs. Use B330B-13-F, SK33AE3/TR13, SK33BE3/TR13, or SK33BH for new product development.

Q: What is the significance of AEC-Q101 qualification on B330B-13-F?

A: AEC-Q101 is an automotive industry qualification standard. B330B-13-F's AEC-Q101 qualification indicates it meets automotive reliability and quality requirements. This qualification is beneficial for automotive applications but is not required for general industrial or consumer applications.

Q: Are there inventory differences between substitute parts?

A: Yes. B330B-13-F has the highest inventory (188,300 pcs), while SK33B/TR13 and SK33BH have lower inventory (768 and 923 pcs respectively). For high-volume production, B330B-13-F offers superior supply chain availability.

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