SI-3033KS Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The SI-3033KS is a linear voltage regulator IC manufactured by Sanken Electric USA Inc., designed to deliver a fixed 3.3V output at 1A maximum current in an 8-SOP surface mount package. This device is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity. The regulator incorporates over-current and over-temperature protection features, operating across the industrial temperature range of -40°C to 125°C.

Substiute Parts

SI-3033KS

Sanken Electric USA Inc.In Stock: 3260SI-3033KS Datasheet

Current PartRFQ

SI-3033KS-TL

Sanken Electric USA Inc.In Stock: 3211SI-3033KS-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SI-3033KS are identified based on strict parametric equivalence across electrical and mechanical specifications. The primary substitution criterion is packaging format compatibility, which determines whether a part can be used as a direct replacement in existing PCB designs.

The SI-3033KS is supplied in Tape & Reel (TR) packaging. The identified substitute, SI-3033KS-TL, maintains identical electrical specifications and mechanical form factor but is supplied in Cut Tape (CT) packaging. Both parts share the following critical parameters that define substitutability:

• Fixed output voltage: 3.3V
• Maximum output current: 1A
• Input voltage rating: 17V maximum
• Dropout voltage: 0.6V @ 1A
• Package type: 8-SOIC (0.173", 4.40mm Width)
• Surface mount configuration
• Operating temperature range: -40°C to 125°C
• Protection features: Over Current, Over Temperature
• RoHS compliance status

The difference in packaging format (Tape & Reel versus Cut Tape) does not affect electrical performance or PCB-level compatibility, as both formats contain the identical die and lead configuration.

Parameter Comparison

Engineering Selection Recommendations

Both the SI-3033KS and SI-3033KS-TL are classified as obsolete products. Selection between these parts should be based on packaging and supply chain requirements rather than electrical performance, as all functional parameters are identical.

The SI-3033KS in Tape & Reel format is suitable for high-volume automated assembly operations where reel-fed component handling is standard. The SI-3033KS-TL in Cut Tape format is appropriate for lower-volume applications, manual assembly processes, or situations where component inventory is managed in smaller quantities.

Both parts carry RoHS compliance certification and are suitable for applications requiring industrial temperature operation from -40°C to 125°C. The identical electrical specifications ensure that either part will perform identically within the same circuit design.

Frequently Asked Questions (FAQ)

Q: Can SI-3033KS-TL be used as a direct replacement for SI-3033KS in existing designs?

A: Yes. The SI-3033KS-TL is electrically and mechanically identical to the SI-3033KS. The only difference is the packaging format (Cut Tape versus Tape & Reel). Both parts use the same 8-SOIC package with identical pin configuration and lead spacing, making them directly interchangeable at the PCB level.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on a continuous reel suitable for automated pick-and-place assembly equipment. Cut Tape (CT) packaging provides the same components cut from the reel and supplied in smaller quantities, typically for manual assembly or lower-volume production. The component itself is identical in both formats.

Q: Are there any electrical performance differences between SI-3033KS and SI-3033KS-TL?

A: No. Both parts have identical electrical specifications, including output voltage (3.3V), output current (1A), dropout voltage (0.6V @ 1A), quiescent current (350 µA), PSRR (55dB), protection features, and operating temperature range (-40°C to 125°C).

Q: Why is the SI-3033KS marked as obsolete?

A: The product status reflects the manufacturer's discontinuation of this part. Obsolete status indicates that the part is no longer in active production. Both the main part and its substitute share this status, making long-term availability a consideration for new designs.

Q: What are the key parameters that determine substitutability for this regulator?

A: The critical parameters are fixed output voltage (3.3V), maximum output current (1A), input voltage rating (17V), package type (8-SOIC), and surface mount configuration. Any substitute must match these specifications exactly. Packaging format (Tape & Reel versus Cut Tape) does not affect electrical or mechanical compatibility.

Q: Is the SI-3033KS suitable for new product designs?

A: Given the obsolete status, the SI-3033KS is not recommended for new designs. However, it remains suitable for maintenance, repair, and production continuation of existing products that already incorporate this part.