SS33 Equivalent & Substitute Parts

Part Overview

The SS33 is a Schottky rectifier diode manufactured by onsemi, rated for 30 V DC reverse voltage and 3 A average rectified current in a surface mount SMC (DO-214AB) package. This component is classified as "Not For New Designs," indicating it has been superseded in onsemi's product portfolio. Equivalent and substitute parts are necessary for applications requiring continued supply, design flexibility, or performance optimization within the specified electrical parameters.

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-214AB, SMC	—
Mounting Type	Surface Mount	—
Operating Temperature - Junction	-55 to 150	°C
Technology	Schottky	—
RoHS Status	ROHS3 Compliant	—

Substitute Part Grouping Explanation

Substitution of the SS33 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

Voltage - DC Reverse (Vr) (Max): 30 V minimum
Current - Average Rectified (Io): 3 A minimum
Voltage - Forward (Vf) (Max) @ If: 500 mV or lower at rated current
Speed: Fast Recovery ≤ 500ns, > 200mA (Io)
Package / Case: DO-214AB, SMC
Mounting Type: Surface Mount
Technology: Schottky

Direct Equivalents maintain all electrical specifications and operating temperature range (-55°C to 150°C).

Functional Substitutes meet or exceed the primary electrical parameters but may differ in secondary characteristics such as reverse leakage current, forward voltage at higher current ratings, or operating temperature range. These parts are suitable for applications where the SS33 specifications are met or exceeded.

Higher Current Rated Substitutes (5 A and 15 A) are included as they satisfy the 3 A requirement and provide additional design margin. These parts are backward compatible for 3 A applications.

Voltage Rated Substitutes (40 V) exceed the 30 V requirement and are suitable for applications requiring higher reverse voltage margin.

Parameter Comparison

Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) [mV]	Ir @ Vr [µA]	Tj (Max) [°C]	Product Status	RoHS
SS33	onsemi	30	3	500 @ 3A	500 @ 30V	150	Not For New Designs	ROHS3
MBRS330T3G	onsemi	30	3	500 @ 3A	2000 @ 30V	150	Active	ROHS3
SK33-TP	Micro Commercial Co	30	3	500 @ 3A	500 @ 30V	150	Not For New Designs	ROHS3
5821SMJ/TR13	Microchip Technology	30	3	480 @ 3A	1500 @ 30V	150	Active	Non-compliant
B330-13-F	Diodes Incorporated	30	3	500 @ 3A	500 @ 30V	125	Active	ROHS3
B530C-13-F	Diodes Incorporated	30	5	550 @ 5A	500 @ 30V	150	Active	ROHS3
B530CQ-13-F	Diodes Incorporated	30	5	700 @ 5A	500 @ 30V	150	Active	ROHS3
SK153-TP	Micro Commercial Co	30	15	550 @ 15A	1000 @ 30V	125	Obsolete	ROHS3
SK33_R1_00001	Panjit International Inc.	30	3	500 @ 3A	200 @ 30V	125	Active	ROHS3
SS33-E3/57T	Vishay General Semiconductor - Diodes Division	30	3	500 @ 3A	500 @ 30V	125	Active	ROHS3
STPS340S	STMicroelectronics	40	3	630 @ 3A	20 @ 40V	150	Active	ROHS3

Engineering Selection Recommendations

For Active Product Status Requirement:

Applications requiring components in active production status should prioritize the following parts:

MBRS330T3G (onsemi): Direct onsemi equivalent with Active status. Identical electrical specifications to SS33. Suitable for designs requiring onsemi product continuity.
B330-13-F (Diodes Incorporated): Active status, identical 30 V / 3 A specifications, ROHS3 compliant. Operating temperature maximum of 125°C is suitable for most applications within the -55°C to 125°C range.
5821SMJ/TR13 (Microchip Technology): Active status with improved forward voltage (480 mV vs. 500 mV). Note: RoHS non-compliant status requires verification against procurement requirements.
SS33-E3/57T (Vishay): Active status, identical electrical specifications, ROHS3 compliant. Operating temperature maximum of 125°C.
SK33_R1_00001 (Panjit International Inc.): Active status, identical specifications, ROHS3 compliant. Lower reverse leakage current (200 µA) provides improved performance margin.

For Higher Current Margin Applications:

B530C-13-F (Diodes Incorporated): 5 A rated current provides 67% design margin over 3 A requirement. Active status, ROHS3 compliant, -55°C to 150°C operating range.

For Higher Voltage Margin Applications:

STPS340S (STMicroelectronics): 40 V reverse voltage rating provides 33% margin over 30 V requirement. Active status, ROHS3 compliant. Forward voltage of 630 mV at 3 A is higher than SS33 specification.

For Automotive Applications:

B530CQ-13-F (Diodes Incorporated): AEC-Q101 qualified, automotive grade, 5 A rated current. Active status, ROHS3 compliant.

Parts to Avoid for New Designs:

SK33-TP and SS33: Both marked "Not For New Designs"
SK153-TP: Obsolete status

Frequently Asked Questions (FAQ)

Q: Can MBRS330T3G directly replace SS33 in existing designs?

A: Yes. MBRS330T3G is manufactured by onsemi and maintains identical electrical specifications (30 V, 3 A, 500 mV forward voltage). The primary difference is higher reverse leakage current (2 mA vs. 500 µA), which is acceptable for most rectifier applications. Packaging is DO-214AB, SMC, identical to SS33.

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

A: B330-13-F is rated for 3 A average rectified current, matching SS33 specifications. B530C-13-F is rated for 5 A, providing additional current capacity. Both maintain 30 V reverse voltage rating and DO-214AB packaging. B530C-13-F is suitable for applications requiring design margin or higher current capability.

Q: Is STPS340S compatible with SS33 applications?

A: STPS340S is electrically compatible for 3 A applications due to its 40 V reverse voltage rating and 3 A current capacity. However, forward voltage is higher (630 mV vs. 500 mV at 3 A), resulting in increased power dissipation. Use STPS340S only when higher reverse voltage margin is required.

Q: Why does 5821SMJ/TR13 show RoHS non-compliant status?

A: 5821SMJ/TR13 is manufactured by Microchip Technology and does not meet ROHS3 compliance requirements. Verify procurement and regulatory requirements before selection. The part is electrically suitable with improved forward voltage (480 mV).

Q: Can I use SK33_R1_00001 in place of SS33?

A: Yes. SK33_R1_00001 (Panjit International Inc.) maintains identical 30 V / 3 A specifications with lower reverse leakage current (200 µA vs. 500 µA), providing improved performance. Operating temperature maximum is 125°C vs. 150°C for SS33. Verify thermal requirements for your application.

Q: What is the significance of the DO-214AB package designation?

A: DO-214AB is the industry standard package designation for SMC (Surface Mount Case) Schottky diodes. All listed substitute parts use DO-214AB packaging, ensuring mechanical and thermal compatibility with SS33 footprints and PCB layouts.

Q: Are there any substitutes with lower forward voltage than SS33?

A: Yes. 5821SMJ/TR13 specifies 480 mV forward voltage at 3 A, compared to SS33 at 500 mV. This 20 mV reduction decreases power dissipation and improves efficiency in rectifier circuits. However, verify RoHS compliance requirements before selection.

Q: Which substitute offers the best reverse leakage performance?

A: SK33_R1_00001 (Panjit International Inc.) specifies 200 µA reverse leakage at 30 V, the lowest among all listed substitutes. This reduces standby power consumption and improves circuit performance in low-leakage applications.

Q: Can B530CQ-13-F be used in non-automotive applications?

A: Yes. B530CQ-13-F is AEC-Q101 qualified for automotive use but is not restricted to automotive applications. The automotive qualification indicates higher reliability and testing standards. It is suitable for any application requiring 30 V / 5 A Schottky rectification with enhanced quality assurance.

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