SK33-7 Schottky Diode 30V 3A Equivalent & Substitute Parts

Part Overview

The SK33-7 is a Schottky rectifier diode rated for 30V DC reverse voltage and 3A average rectified current in a Surface Mount SMC (DO-214AB) package. Manufactured by Diodes Incorporated, this component is classified as discontinued at DiGi Electronics, necessitating identification of equivalent and substitute parts for ongoing production and repair applications. The part exhibits fast recovery characteristics with switching speeds ≤500ns for currents >200mA, making it suitable for high-frequency rectification circuits. Due to its discontinued status, alternative sources and equivalent devices are required to maintain design continuity.

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 @ A
Speed - Fast Recovery	≤500ns, >200mA (Io)	ns
Current - Reverse Leakage @ Vr	500 µA @ 30 V	µA @ V
Capacitance @ Vr, F	300pF @ 4V, 1MHz	pF @ V, MHz
Package / Case	DO-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-65°C to 150°C	°C
Technology	Schottky	—
RoHS Status	RoHS non-compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitution of the SK33-7 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 (exact match required)
Technology: Schottky (exact match required)
Mounting Type: Surface Mount (exact match required)
Package / Case: DO-214AB or SMC compatible (exact match required)
Speed: Fast Recovery ≤500ns, >200mA (exact match required)

Secondary Compatibility Factors:

Operating Temperature Range: Must encompass or match the original -65°C to 150°C range
Forward Voltage (Vf): Variations within ±100mV at rated current are acceptable for circuit operation
Reverse Leakage Current: Variations acceptable within typical device tolerances
Capacitance: Variations acceptable for non-critical frequency applications

Substitute parts are classified into two categories: MFR Recommended (manufacturer-designated equivalents with identical electrical ratings) and Parametric Equivalent (parts meeting all critical electrical and mechanical parameters).

Parameter Comparison

Parameter	SK33-7 (Main)	SK33-TP	SS33	PMEG3030EP,115	NRVBS330T3G
Manufacturer	Diodes Incorporated	Micro Commercial Co	Fairchild Semiconductor	Nexperia USA Inc.	onsemi
Voltage - DC Reverse (Vr) Max	30 V	30 V	30 V	30 V	30 V
Current - Average Rectified (Io)	3 A	3 A	3 A	3 A	3 A
Voltage - Forward (Vf) Max @ If	500 mV @ 3 A	500 mV @ 3 A	500 mV @ 3 A	360 mV @ 3 A	500 mV @ 3 A
Speed - Fast Recovery	≤500ns, >200mA	≤500ns, >200mA	≤500ns, >200mA	≤500ns, >200mA	≤500ns, >200mA
Current - Reverse Leakage @ Vr	500 µA @ 30 V	500 µA @ 30 V	500 µA @ 30 V	5 mA @ 30 V	2 mA @ 40 V
Capacitance @ Vr, F	300pF @ 4V, 1MHz	250pF @ 4V, 1MHz	Not specified	470pF @ 1V, 1MHz	Not specified
Package / Case	DO-214AB, SMC	DO-214AB, SMC	DO-214AB, SMC	SOD-128	DO-214AB, SMC
Operating Temperature - Junction	-65°C to 150°C	-55°C to 150°C	-55°C to 150°C	150°C (Max)	-65°C to 150°C
Product Status	Discontinued	Not For New Designs	Active	Active	Obsolete
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Active Production (New Designs):

The SS33 manufactured by Fairchild Semiconductor is the primary recommended substitute. This part maintains identical electrical specifications to the SK33-7 (30V, 3A, 500mV forward voltage, fast recovery ≤500ns) in the same DO-214AB SMC package. The SS33 is currently active in production with 26,200 units in stock. While RoHS compliance status is not specified, this part provides direct functional equivalence with established supply availability.

The PMEG3030EP,115 manufactured by Nexperia USA Inc. is an alternative active substitute with superior electrical performance characteristics. This part offers lower forward voltage (360mV @ 3A versus 500mV), reducing power dissipation in rectification circuits. However, it uses a different package format (SOD-128/CFP5) requiring PCB layout modification. This part is ROHS3 compliant with 68,285 units in stock. Selection of this part is appropriate when thermal management or power efficiency improvements are prioritized and package redesign is feasible.

For Existing Designs (Maintenance and Repair):

The SK33-TP manufactured by Micro Commercial Co provides direct form-factor and electrical equivalence to the SK33-7. This part is marked "Not For New Designs" but remains available with 5,722 units in stock. It maintains the DO-214AB SMC package, identical voltage and current ratings, and identical forward voltage characteristics. This part is ROHS3 compliant and suitable for field replacement and repair applications where design modification is not permitted.

For Automotive or High-Reliability Applications:

The NRVBS330T3G manufactured by onsemi is a parametric equivalent qualified to AEC-Q101 automotive standards. This part maintains identical electrical specifications (30V, 3A, 500mV forward voltage) in the DO-214AB SMC package with extended temperature range (-65°C to 150°C). This part is ROHS3 compliant with 5,200 units in stock and is appropriate for automotive, industrial, or mission-critical applications requiring automotive-grade qualification.

Package Compatibility Note:

The SK153-TP is not recommended as a direct substitute despite sharing the same package and manufacturer. This part is rated for 15A average rectified current, exceeding the SK33-7 specification by 5x. While higher current rating does not prevent functional operation in 3A circuits, this part is marked obsolete and represents over-specification for the intended application.

Frequently Asked Questions (FAQ)

Q: Can the PMEG3030EP,115 be used as a direct replacement for the SK33-7 without circuit modification?

A: The PMEG3030EP,115 provides electrical equivalence but uses a different package format (SOD-128/CFP5 versus DO-214AB SMC). Direct PCB substitution is not possible without layout redesign. However, the electrical characteristics are compatible: identical 30V reverse voltage, 3A current rating, and fast recovery speed. If circuit board modification is acceptable, this part offers improved performance through lower forward voltage (360mV versus 500mV).

Q: What is the difference between the SK33-7 and SK33-TP?

A: Both parts are manufactured by different companies (Diodes Incorporated versus Micro Commercial Co) but share identical electrical specifications: 30V reverse voltage, 3A current rating, 500mV forward voltage, and DO-214AB SMC package. The primary differences are product status (SK33-7 is discontinued; SK33-TP is not for new designs) and RoHS compliance (SK33-TP is ROHS3 compliant). For existing designs, SK33-TP provides direct substitution.

Q: Is the SS33 suitable for new product designs?

A: Yes. The SS33 is currently active in production status with 26,200 units in stock. It provides identical electrical specifications to the SK33-7 (30V, 3A, 500mV forward voltage, fast recovery ≤500ns) in the same DO-214AB SMC package. This part is the recommended choice for new designs requiring direct form-factor compatibility.

Q: Why does the NRVBS330T3G have different reverse leakage current specifications?

A: The NRVBS330T3G specifies 2mA reverse leakage at 40V, compared to 500µA at 30V for the SK33-7. This difference reflects measurement at different voltage levels and is within acceptable parametric variation for Schottky diodes. The NRVBS330T3G is qualified to AEC-Q101 automotive standards, which may account for specification differences. Both parts remain functionally equivalent for rectification applications.

Q: Can the SK153-TP be used in place of the SK33-7?

A: The SK153-TP shares the same DO-214AB SMC package and 30V reverse voltage rating but is specified for 15A average rectified current, compared to 3A for the SK33-7. While higher current rating does not prevent operation in 3A circuits, this represents over-specification. The SK153-TP is marked obsolete, making it unsuitable for new designs. The SS33 or SK33-TP are preferred alternatives.

Q: What is the impact of forward voltage differences between substitute parts?

A: Forward voltage differences directly affect power dissipation in rectification circuits. The PMEG3030EP,115 operates at 360mV @ 3A, compared to 500mV for the SK33-7. This 140mV reduction decreases power loss by approximately 28% at rated current. In high-frequency or high-current applications, this difference may reduce thermal stress on the component and surrounding circuitry. In low-power applications, the difference is negligible.

Q: Are all substitute parts RoHS compliant?

A: No. The SK33-7 is RoHS non-compliant. Among active substitutes, the SS33 RoHS status is not specified, while the SK33-TP, PMEG3030EP,115, and NRVBS330T3G are all ROHS3 compliant. For applications requiring RoHS compliance, the PMEG3030EP,115, SK33-TP, or NRVBS330T3G are appropriate selections.

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

A: The SK33-7 operates from -65°C to 150°C. The SK33-TP and SS33 operate from -55°C to 150°C, providing 10°C less low-temperature capability. The PMEG3030EP,115 specifies only a maximum of 150°C without a minimum. The NRVBS330T3G matches the original -65°C to 150°C range. For applications requiring full -65°C operation, the SK33-7 or NRVBS330T3G are required.

Q: Is the PMEG3030EP,115 available in the same packaging format as the SK33-7?

A: No. The PMEG3030EP,115 uses SOD-128/CFP5 packaging, while the SK33-7 uses DO-214AB SMC. These are different physical packages requiring different PCB footprints. Substitution requires circuit board redesign. All other recommended substitutes (SK33-TP, SS33, NRVBS330T3G) use the same DO-214AB SMC package and allow direct PCB substitution.

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