SK33 Schottky Diode 30V 3A Equivalent & Substitute Parts

Part Overview

The SK33 is a Schottky rectifier diode rated for 30V DC reverse voltage and 3A average rectified current in a surface mount DO-214AB (SMC) package. Manufactured by Micro Commercial Co, this component is classified as obsolete product status. Due to its obsolete designation and limited availability for new production, identifying equivalent and substitute parts is necessary to maintain design continuity and ensure supply chain reliability for applications requiring 30V/3A Schottky rectification.

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
Operating Temperature - Junction	-55 to 150	°C
Mounting Type	Surface Mount
Package / Case	DO-214AB, SMC
Technology	Schottky

Substitute Part Grouping Explanation

Substitution of the SK33 is determined by strict equivalence across the following critical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) Maximum: 30V (exact match required)
Current - Average Rectified (Io): 3A minimum (equal or higher acceptable)
Voltage - Forward (Vf) @ If: 500 mV @ 3A or lower (lower forward voltage acceptable)
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Current - Reverse Leakage @ Vr: 500 µA @ 30V or lower
Package / Case: DO-214AB, SMC (mechanical compatibility)
Mounting Type: Surface Mount
Technology: Schottky

Substitution Categories:

Direct Equivalents (Same Electrical Ratings): Parts matching all primary criteria with identical 3A current rating and 500 mV forward voltage specification.

Higher Current Rated Substitutes (Uprated): Parts rated for 4A or 5A current capacity with 30V reverse voltage. These provide enhanced current handling capability while maintaining voltage and package compatibility. Forward voltage may vary based on higher current rating.

Compliance Variants: Parts with identical electrical specifications but different RoHS compliance status or packaging formats (Tape & Reel vs. Cut Tape).

Parameter Comparison

Part Number	Manufacturer	Vr (Max) V	Io (A)	Vf (Max) @ If (mV)	Reverse Leakage @ Vr (µA)	Tj (°C)	Package	Product Status	RoHS Status
SK33	Micro Commercial Co	30	3	500 @ 3A	500 @ 30V	-55 to 150	DO-214AB, SMC	Obsolete	Non-compliant
SK33-TP	Micro Commercial Co	30	3	500 @ 3A	500 @ 30V	-55 to 150	DO-214AB, SMC	Not For New Designs	ROHS3 Compliant
SS33-E3/57T	Vishay General Semiconductor - Diodes Division	30	3	500 @ 3A	500 @ 30V	-55 to 125	DO-214AB, SMC	Active	ROHS3 Compliant
SS33-E3/9AT	Vishay General Semiconductor - Diodes Division	30	3	500 @ 3A	500 @ 30V	-55 to 125	DO-214AB, SMC	Active	ROHS3 Compliant
B330-13-F	Diodes Incorporated	30	3	500 @ 3A	500 @ 30V	-55 to 125	DO-214AB, SMC	Active	ROHS3 Compliant
B530C-13-F	Diodes Incorporated	30	5	550 @ 5A	500 @ 30V	-55 to 150	DO-214AB, SMC	Active	ROHS3 Compliant
B530CQ-13-F	Diodes Incorporated	30	5	700 @ 5A	500 @ 30V	-55 to 150	DO-214AB, SMC	Active	ROHS3 Compliant
MBRS330T3G	onsemi	30	3	500 @ 3A	2 @ 30V	-65 to 150	DO-214AB, SMC	Active	ROHS3 Compliant
SK33/TR13	Microsemi Corporation	30	3	500 @ 3A	500 @ 30V	-55 to 125	DO-214AB, SMC	Active	Non-compliant
SK33E3/TR13	Microsemi Corporation	30	3	500 @ 3A	500 @ 30V	-55 to 125	DO-214AB, SMC	Active	ROHS3 Compliant
SL43-E3/57T	Vishay General Semiconductor - Diodes Division	30	4	420 @ 4A	500 @ 30V	-55 to 125	DO-214AB, SMC	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Specifications):

Select from the following parts when exact electrical equivalence is required:

SS33-E3/57T (Vishay): Active product status with ROHS3 compliance. Identical 30V/3A ratings and 500 mV forward voltage. Operating temperature range -55°C to 125°C. Suitable for new designs.
SS33-E3/9AT (Vishay): Active product status with ROHS3 compliance. Identical electrical specifications to SS33-E3/57T. Higher inventory availability (14,400 pcs). Tape & Reel packaging.
B330-13-F (Diodes Incorporated): Active product status with ROHS3 compliance. Identical 30V/3A ratings and 500 mV forward voltage. Highest inventory availability (62,100 pcs). Operating temperature range -55°C to 125°C.
MBRS330T3G (onsemi): Active product status with ROHS3 compliance. Identical voltage and current ratings. Lower reverse leakage current (2 µA vs. 500 µA). Extended operating temperature range -65°C to 150°C. Suitable for applications requiring lower leakage characteristics.
SK33E3/TR13 (Microsemi): Active product status with ROHS3 compliance. Identical electrical specifications. Microsemi variant of the original SK33 base product.

For Uprated Current Capacity (Higher Current Handling):

SL43-E3/57T (Vishay): 4A rated current with 30V reverse voltage. Lower forward voltage (420 mV @ 4A) compared to SK33. Active product status with ROHS3 compliance. Suitable when additional current margin is required.
B530C-13-F (Diodes Incorporated): 5A rated current with 30V reverse voltage. Higher forward voltage (550 mV @ 5A). Active product status with ROHS3 compliance. Extended operating temperature range -55°C to 150°C. Suitable for applications requiring significant current margin.
B530CQ-13-F (Diodes Incorporated): 5A rated current with 30V reverse voltage. AEC-Q101 automotive qualification. Higher forward voltage (700 mV @ 5A). Active product status with ROHS3 compliance. Extended operating temperature range -55°C to 150°C. Suitable for automotive applications.

Compliance Considerations:

The original SK33 is RoHS non-compliant and obsolete. For new designs and production, select ROHS3 compliant alternatives. SK33-TP (Micro Commercial Co) provides a direct equivalent with ROHS3 compliance but is designated "Not For New Designs." Vishay, Diodes Incorporated, and onsemi alternatives are all ROHS3 compliant and carry active product status.

Temperature Range Considerations:

The original SK33 supports -55°C to 150°C junction temperature. Most direct equivalents operate to -55°C to 125°C. MBRS330T3G and B530C/B530CQ series support the full -55°C to 150°C range, matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can I use SS33-E3/57T as a direct replacement for SK33?

A: Yes. SS33-E3/57T provides identical electrical specifications: 30V reverse voltage, 3A average rectified current, 500 mV forward voltage @ 3A, and fast recovery characteristics. Both use DO-214AB (SMC) surface mount packaging. SS33-E3/57T is active product status with ROHS3 compliance, whereas SK33 is obsolete and non-compliant.

Q: What is the difference between B330-13-F and B530C-13-F?

A: B330-13-F is rated for 3A current with 500 mV forward voltage @ 3A. B530C-13-F is rated for 5A current with 550 mV forward voltage @ 5A. Both maintain 30V reverse voltage and DO-214AB packaging. B530C-13-F provides higher current capacity and extended temperature range (-55°C to 150°C vs. -55°C to 125°C).

Q: Why does MBRS330T3G have lower reverse leakage current (2 µA vs. 500 µA)?

A: Reverse leakage current is a manufacturing and design characteristic that varies by manufacturer and process technology. MBRS330T3G achieves lower leakage while maintaining identical voltage and current ratings. Lower leakage reduces standby power consumption in applications where this parameter is critical.

Q: Can I use a 4A or 5A rated diode in place of the 3A SK33?

A: Yes. SL43-E3/57T (4A) and B530C-13-F (5A) are electrically compatible substitutes with higher current capacity. These parts maintain 30V reverse voltage and DO-214AB packaging. Higher current rating provides design margin and does not degrade performance in 3A applications. Forward voltage specifications differ due to higher current rating.

Q: What is the difference between Cut Tape (CT) and Tape & Reel (TR) packaging?

A: Both formats use identical DO-214AB (SMC) component packages. Cut Tape is supplied in individual strips suitable for manual assembly or small-volume production. Tape & Reel is supplied on continuous reels for automated pick-and-place assembly. Electrical specifications are identical; packaging format selection depends on assembly process requirements.

Q: Is SK33/TR13 from Microsemi a suitable replacement?

A: SK33/TR13 provides identical electrical specifications and is active product status. However, it is RoHS non-compliant, matching the original SK33 compliance status. For new designs requiring RoHS compliance, select SK33E3/TR13 (ROHS3 compliant variant) or alternatives from Vishay, Diodes Incorporated, or onsemi.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the component meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. For production systems subject to environmental regulations or customer requirements, ROHS3 compliant parts are mandatory. All active product alternatives listed are ROHS3 compliant except SK33/TR13.

Q: Can I use B530CQ-13-F in non-automotive applications?

A: Yes. B530CQ-13-F is AEC-Q101 automotive qualified but functions identically to B530C-13-F in non-automotive applications. Both are 5A/30V Schottky diodes with DO-214AB packaging. Automotive qualification does not restrict use in other applications; it indicates additional qualification testing has been performed.

Q: What is the operating temperature range difference between SK33 and its substitutes?

A: SK33 operates -55°C to 150°C junction temperature. Most direct equivalents (SS33 series, B330-13-F) operate -55°C to 125°C, a 25°C reduction at the upper limit. MBRS330T3G and B530 series maintain the full -55°C to 150°C range. For applications requiring maximum temperature operation, select MBRS330T3G or B530 series.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message