SS33-E3/9AT Equivalent & Substitute Parts

Part Overview

The SS33-E3/9AT is a Schottky rectifier diode manufactured by Vishay General Semiconductor - Diodes Division, rated for 30 V DC reverse voltage and 3 A average rectified current in a surface mount DO-214AB (SMC) package. This component is classified as Active and is ROHS3 Compliant. Equivalent and substitute parts are identified based on matching electrical specifications and mechanical compatibility within the Schottky diode rectifier category. Alternative part numbers may be required due to supply chain availability, packaging format preferences, or manufacturer transitions while maintaining functional equivalence in circuit applications.

Key Parameters

Parameter	Value	Unit
Technology	Schottky	—
Voltage - DC Reverse (Vr) (Max)	30	V
Current - Average Rectified (Io)	3	A
Voltage - Forward (Vf) (Max) @ If	500 mV @ 3 A	—
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	—
Current - Reverse Leakage @ Vr	500 µA @ 30 V	—
Mounting Type	Surface Mount	—
Package / Case	DO-214AB, SMC	—
Operating Temperature - Junction	-55 to 125	°C
RoHS Status	ROHS3 Compliant	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	—

Substitute Part Grouping Explanation

Substitute parts for the SS33-E3/9AT are classified into three categories based on electrical and mechanical compatibility:

Parametric Equivalents maintain identical electrical specifications: 30 V reverse voltage, 3 A average rectified current, 500 mV forward voltage drop at 3 A, and fast recovery characteristics. These parts differ only in packaging format (Tape & Reel versus Cut Tape) or manufacturer source. Parametric equivalents include SS33-E3/57T (Vishay, Cut Tape format), SK33_R1_00001 (Panjit International Inc.), B330-13-F (Diodes Incorporated), and SK33-TP (Micro Commercial Co).

Direct Equivalents provide identical electrical performance with the same package type but from alternative manufacturers. STPS340S (STMicroelectronics) and STPS3L40S (STMicroelectronics) operate at higher reverse voltage ratings (40 V) while maintaining 3 A current capacity and compatible package dimensions, allowing direct substitution in applications with voltage margin requirements.

Upgrade Options include the base part number SS33 (Fairchild Semiconductor) in bulk packaging, which matches all electrical specifications and supports higher junction temperature operation (-55°C to 150°C versus -55°C to 125°C).

Substitution is determined by matching the following critical parameters: Schottky technology, 30 V minimum reverse voltage rating, 3 A current capacity, fast recovery speed, DO-214AB (SMC) package compatibility, and surface mount mounting type.

Parameter Comparison

Manufacturer Part Number	Manufacturer	Vr (Max) [V]	Io [A]	Vf (Max) @ If [mV]	Reverse Leakage @ Vr [µA]	Package	Packaging Format	Product Status	Tj (Max) [°C]
SS33-E3/9AT	Vishay General Semiconductor	30	3	500 @ 3 A	500 @ 30 V	DO-214AB, SMC	Tape & Reel (TR)	Active	125
SS33-E3/57T	Vishay General Semiconductor	30	3	500 @ 3 A	500 @ 30 V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	125
SK33-TP	Micro Commercial Co	30	3	500 @ 3 A	500 @ 30 V	DO-214AB, SMC	Tape & Reel (TR)	Not For New Designs	150
SK33_R1_00001	Panjit International Inc.	30	3	500 @ 3 A	200 @ 30 V	DO-214AB, SMC	Tape & Reel (TR)	Active	125
B330-13-F	Diodes Incorporated	30	3	500 @ 3 A	500 @ 30 V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	125
STPS340S	STMicroelectronics	40	3	630 @ 3 A	20 @ 40 V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	150
STPS3L40S	STMicroelectronics	40	3	500 @ 3 A	100 @ 40 V	DO-214AB, SMC	Cut Tape (CT) & Digi-Reel®	Active	150
SS33	Fairchild Semiconductor	30	3	500 @ 3 A	500 @ 30 V	DO-214AB, SMC	Bulk	Active	150

Engineering Selection Recommendations

Primary Equivalents for Direct Substitution:

SS33-E3/57T (Vishay General Semiconductor) is the direct equivalent differing only in packaging format (Cut Tape & Digi-Reel® versus Tape & Reel). Selection between these formats depends on assembly line requirements and tape configuration compatibility.

B330-13-F (Diodes Incorporated) and SK33_R1_00001 (Panjit International Inc.) are parametric equivalents with identical electrical specifications and Active product status, suitable for applications requiring alternative sourcing or supply chain diversification.

Alternative Selections with Enhanced Specifications:

STPS3L40S (STMicroelectronics) provides 40 V reverse voltage rating with matching 3 A current capacity and 500 mV forward voltage drop, enabling use in circuits requiring higher voltage margin. This part maintains Active status and extended junction temperature range (-55°C to 150°C).

STPS340S (STMicroelectronics) offers 40 V reverse voltage with 3 A current capacity and Active product status. Forward voltage drop is specified at 630 mV @ 3 A, representing a 26% increase compared to the SS33-E3/9AT. This part is suitable for applications where voltage margin is prioritized over forward voltage characteristics.

SS33 (Fairchild Semiconductor) in bulk packaging provides identical electrical specifications with extended junction temperature operation to 150°C, supporting applications requiring higher thermal performance.

Parts Not Recommended for New Designs:

SK33-TP (Micro Commercial Co) carries "Not For New Designs" status and should not be selected for new circuit development, despite electrical equivalence.

SK153-TP (Micro Commercial Co) is classified as Obsolete and is not suitable for any new applications.

Compliance Verification:

All recommended substitute parts maintain ROHS3 Compliance, REACH Unaffected status, and Moisture Sensitivity Level 1 (Unlimited), matching the compliance profile of the SS33-E3/9AT.

Frequently Asked Questions (FAQ)

Q: Can SS33-E3/57T be used as a direct replacement for SS33-E3/9AT?

A: Yes. SS33-E3/57T is a parametric equivalent manufactured by Vishay General Semiconductor with identical electrical specifications (30 V, 3 A, 500 mV forward voltage). The only difference is packaging format: SS33-E3/57T is supplied in Cut Tape & Digi-Reel® format while SS33-E3/9AT is supplied in Tape & Reel format. Compatibility depends on assembly equipment tape format compatibility.

Q: What is the difference between parametric equivalents and direct equivalents?

A: Parametric equivalents (such as B330-13-F and SK33_R1_00001) match all electrical specifications and package type but originate from different manufacturers. Direct equivalents (such as STPS340S and STPS3L40S) may have enhanced specifications (higher voltage rating) while maintaining package compatibility and current capacity, allowing substitution in applications with additional design margin requirements.

Q: Can STPS340S replace SS33-E3/9AT in all applications?

A: STPS340S is electrically compatible for circuits designed for 30 V operation, as it is rated for 40 V reverse voltage. However, forward voltage drop is specified at 630 mV @ 3 A compared to 500 mV for the SS33-E3/9AT, representing a 26% increase. This higher forward voltage drop may affect circuit performance in applications sensitive to voltage regulation or power dissipation. Verification of circuit tolerance to this parameter difference is required.

Q: Why is SK33-TP marked "Not For New Designs"?

A: SK33-TP carries "Not For New Designs" status from the manufacturer, indicating the part is in a transition phase or being phased out. While electrically equivalent, this designation indicates the manufacturer does not recommend its use in new circuit development. Alternative sources such as B330-13-F or SK33_R1_00001 should be selected for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this reference maintain ROHS3 Compliance and REACH Unaffected status, matching the environmental compliance profile of the SS33-E3/9AT.

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

A: DO-214AB is the industry standard package designation for surface mount Schottky diodes in the 3 A current class. SMC (Surface Mount Component) indicates the package is designed for automated surface mount assembly. All substitute parts use this identical package, ensuring mechanical and thermal compatibility on printed circuit boards designed for the SS33-E3/9AT.

Q: Can bulk-packaged SS33 be used in place of tape-and-reel SS33-E3/9AT?

A: Electrically and mechanically, yes. SS33 (Fairchild Semiconductor) in bulk packaging provides identical electrical specifications and package type. However, bulk packaging requires manual handling and tape conversion for automated assembly lines. Selection depends on assembly process requirements and whether tape conversion equipment is available.

Q: What is the operating temperature range difference between SS33-E3/9AT and substitute parts?

A: SS33-E3/9AT is rated for -55°C to 125°C junction temperature. Substitute parts from STMicroelectronics (STPS340S, STPS3L40S) and Fairchild Semiconductor (SS33) extend the maximum junction temperature to 150°C, providing 25°C additional thermal margin. This extended range is beneficial for applications operating in elevated ambient temperature environments.

Q: How does reverse leakage current affect part selection?

A: Reverse leakage current is specified at the maximum reverse voltage rating. SS33-E3/9AT specifies 500 µA @ 30 V. Substitute parts show variation: SK33_R1_00001 specifies 200 µA @ 30 V (lower leakage), while STPS340S specifies 20 µA @ 40 V (significantly lower). Lower reverse leakage reduces standby power consumption and heat generation in applications with sustained reverse bias conditions.

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