SSL33 Schottky Diode Equivalent & Substitute Parts

Part Overview

The SSL33 is an active Schottky rectifier diode manufactured by Taiwan Semiconductor Corporation, rated for 30V DC reverse voltage and 3A average rectified current in a surface mount DO-214AB (SMC) package. This component is designed for fast recovery applications requiring switching speeds of 500ns or less at currents exceeding 200mA. The SSL33 remains in active production status with 685 units currently in stock.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are required due to supply constraints, inventory availability, or design flexibility within established parameter tolerances.

Key Parameters

Parameter	Value	Unit	Significance for Substitution
Voltage - DC Reverse (Vr) (Max)	30	V	Critical - must match or exceed
Current - Average Rectified (Io)	3	A	Critical - must match or exceed
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	ns	Critical - switching performance requirement
Package / Case	DO-214AB, SMC	-	Critical - mechanical and thermal compatibility
Mounting Type	Surface Mount	-	Critical - PCB assembly compatibility
Operating Temperature - Junction	-55°C ~ 125°C	°C	Important - thermal operating range
Technology	Schottky	-	Critical - device type and characteristics
RoHS Status	ROHS3 Compliant	-	Important - regulatory compliance

Substitute Part Grouping Explanation

Substitution eligibility for the SSL33 is determined by strict equivalence across the following parameters:

Critical Electrical Parameters:

Voltage - DC Reverse (Vr) (Max): 30V minimum
Current - Average Rectified (Io): 3A minimum
Technology: Schottky diode type
Speed: Fast Recovery ≤ 500ns at currents > 200mA

Critical Mechanical Parameters:

Package / Case: DO-214AB (SMC) surface mount package
Mounting Type: Surface mount configuration

Compliance Parameters:

RoHS3 Compliance required
Operating Temperature Range: -55°C to 125°C minimum

The SK33 manufactured by SMC Diode Solutions meets all critical electrical and mechanical requirements for direct substitution with the SSL33. Both devices share identical voltage ratings, current ratings, package specifications, and fast recovery switching characteristics. Compliance certifications and operating temperature ranges are equivalent or superior.

Parameter Comparison

Parameter	SSL33 (Taiwan Semiconductor)	SK33 (SMC Diode Solutions)	Match Status
Voltage - DC Reverse (Vr) (Max)	30 V	30 V	Equivalent
Current - Average Rectified (Io)	3 A	3 A	Equivalent
Technology	Schottky	Schottky	Equivalent
Speed	Fast Recovery ≤ 500ns, > 200mA (Io)	Fast Recovery ≤ 500ns, > 200mA (Io)	Equivalent
Package / Case	DO-214AB, SMC	DO-214AB, SMC	Equivalent
Mounting Type	Surface Mount	Surface Mount	Equivalent
Operating Temperature - Junction	-55°C ~ 125°C	-65°C ~ 125°C	SK33 Superior Range
Current - Reverse Leakage @ Vr	200 µA @ 30 V	500 µA @ 30 V	SSL33 Lower Leakage
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Equivalent
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	Equivalent

Engineering Selection Recommendations

SSL33 Selection Criteria: The SSL33 is the primary component choice when lower reverse leakage current (200 µA @ 30V) is a design requirement. This characteristic is beneficial in applications where leakage-induced power dissipation or signal integrity must be minimized. The SSL33 maintains active production status with established supply availability.

SK33 Selection Criteria: The SK33 serves as a direct functional substitute when SSL33 availability is constrained or when the extended lower operating temperature limit (-65°C versus -55°C) is required. The SK33 provides equivalent electrical performance across all critical parameters with higher inventory availability (7550 units in stock versus 685 units). The SK33 is suitable for applications where the higher reverse leakage specification (500 µA @ 30V) does not impact circuit performance.

Compliance Considerations: Both devices maintain ROHS3 compliance and unlimited moisture sensitivity classification (MSL 1), ensuring compatibility with standard surface mount assembly processes and long-term storage without special handling requirements.

Frequently Asked Questions (FAQ)

Q: Can the SK33 replace the SSL33 in existing designs without PCB modification?

A: Yes. Both devices use identical DO-214AB (SMC) surface mount packages with matching pin configurations and thermal characteristics. No PCB layout changes are required for direct substitution.

Q: What is the primary electrical difference between SSL33 and SK33?

A: The reverse leakage current differs: SSL33 specifies 200 µA @ 30V while SK33 specifies 500 µA @ 30V. Both values are within acceptable ranges for standard rectifier applications. Applications sensitive to leakage current should retain the SSL33.

Q: Are both parts suitable for high-temperature applications?

A: Both devices operate to 125°C junction temperature. The SK33 extends the lower temperature limit to -65°C, providing a wider operating range. For applications requiring operation below -55°C, the SK33 is required.

Q: Do both parts meet current industry compliance standards?

A: Yes. Both SSL33 and SK33 are ROHS3 compliant and carry MSL 1 (unlimited) moisture sensitivity ratings, meeting current regulatory requirements for electronics manufacturing.

Q: What is the switching speed specification for both devices?

A: Both devices are specified as fast recovery Schottky diodes with recovery time ≤ 500ns at currents exceeding 200mA, ensuring equivalent performance in high-frequency switching applications.

Q: Which part should be selected for new designs?

A: Either part is acceptable for new designs. Selection should be based on specific application requirements: choose SSL33 for lower leakage current sensitivity; choose SK33 for extended low-temperature operation or when higher inventory availability is advantageous.

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