SI-3033LSA Linear Voltage Regulator

Part Overview

The SI-3033LSA is a linear voltage regulator IC manufactured by Sanken Electric USA Inc., designed for positive fixed 3.3V output applications with 1A current capacity in an 8-SOP surface mount package. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing production support and design continuity. The part delivers regulated 3.3V output from input voltages up to 5.2V with integrated over-current and over-temperature protection features.

Key Parameters

Parameter	Value
Manufacturer	Sanken Electric USA Inc.
Category	Power Management (PMIC)
Output Voltage (Fixed)	3.3V
Output Current	1A
Input Voltage (Max)	5.2V
Voltage Dropout (Max)	0.8V @ 1A
Quiescent Current	2.5 mA
PSRR	55dB (100Hz ~ 120Hz)
Operating Temperature Range	-20°C ~ 125°C
Package	8-SOIC (0.173", 4.40mm Width)
Mounting Type	Surface Mount
Protection Features	Over Current, Over Temperature
Control Features	Enable
RoHS Status	RoHS Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SI-3033LSA is determined by strict equivalence across all electrical and mechanical parameters. The substitute part SI-3033LSA-TL maintains identical specifications for output voltage (3.3V fixed), output current (1A), input voltage rating (5.2V maximum), voltage dropout characteristics (0.8V @ 1A), quiescent current (2.5 mA), PSRR performance (55dB at 100Hz ~ 120Hz), operating temperature range (-20°C ~ 125°C), and package configuration (8-SOIC). Both parts share the same protection features (over-current and over-temperature), control features (enable function), and compliance certifications (RoHS compliant, MSL 1). The only distinction between these parts is the packaging format: the main part is supplied in standard packaging, while the substitute is supplied in cut tape (CT) format.

Parameter Comparison

Parameter	SI-3033LSA	SI-3033LSA-TL	Match
Manufacturer	Sanken Electric USA Inc.	Sanken Electric USA Inc.	✓
Output Voltage (Fixed)	3.3V	3.3V	✓
Output Current	1A	1A	✓
Input Voltage (Max)	5.2V	5.2V	✓
Voltage Dropout (Max)	0.8V @ 1A	0.8V @ 1A	✓
Quiescent Current	2.5 mA	2.5 mA	✓
PSRR	55dB (100Hz ~ 120Hz)	55dB (100Hz ~ 120Hz)	✓
Operating Temperature Range	-20°C ~ 125°C	-20°C ~ 125°C	✓
Package / Case	8-SOIC (0.173", 4.40mm Width)	8-SOIC (0.173", 4.40mm Width)	✓
Mounting Type	Surface Mount	Surface Mount	✓
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature	✓
Control Features	Enable	Enable	✓
RoHS Status	RoHS Compliant	RoHS Compliant	✓
MSL Rating	1 (Unlimited)	1 (Unlimited)	✓
Packaging Format	Standard	Cut Tape (CT)	Different

Engineering Selection Recommendations

The SI-3033LSA-TL is a direct parametric equivalent to the SI-3033LSA. Both parts are classified as obsolete products from the same manufacturer with identical electrical performance and mechanical specifications. Selection between these parts should be based on packaging and supply requirements: the SI-3033LSA-TL in cut tape format offers significantly higher inventory availability (121,600 pcs vs. 4,180 pcs) and is suitable for automated assembly processes. Both parts maintain full RoHS compliance and MSL 1 rating, ensuring compatibility with standard manufacturing and storage conditions. The electrical characteristics, thermal performance, and protection mechanisms are identical across both part numbers.

Frequently Asked Questions (FAQ)

Q: Can SI-3033LSA-TL be used as a direct replacement for SI-3033LSA? A: Yes. Both parts are electrically and mechanically identical. The only difference is packaging format (cut tape vs. standard packaging). They are pin-compatible, have identical electrical specifications, and can be substituted without circuit modification.

Q: What is the difference between the two part numbers? A: The SI-3033LSA-TL designation indicates cut tape (CT) packaging format, while SI-3033LSA uses standard packaging. All electrical parameters, output voltage, current rating, thermal characteristics, and protection features are identical.

Q: Are both parts suitable for high-volume production? A: Yes. Both parts are surface mount components in 8-SOIC packages compatible with standard pick-and-place assembly equipment. The SI-3033LSA-TL in cut tape format is optimized for automated high-volume production environments.

Q: What are the key parameters that define substitution eligibility? A: Substitution is determined by matching output voltage (3.3V fixed), output current (1A), input voltage rating (5.2V maximum), voltage dropout (0.8V @ 1A), quiescent current (2.5 mA), PSRR (55dB), operating temperature range (-20°C ~ 125°C), package type (8-SOIC), and protection features (over-current and over-temperature).

Q: Are there any compliance or certification differences? A: No. Both parts are RoHS compliant with MSL 1 rating. They share identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications.

Q: What is the MSL 1 rating significance? A: MSL 1 (Moisture Sensitivity Level 1) indicates unlimited shelf life without moisture control requirements. Both parts can be stored under standard conditions without special desiccant packaging or time-limited exposure windows.

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