SPX3819S-L Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The SPX3819S-L is a linear voltage regulator IC from MaxLinear, Inc., designed for positive adjustable output applications with 500mA current capability in an 8-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent substitute parts necessary for ongoing design support and procurement. The SPX3819S-L provides adjustable output voltage regulation from 1.235V to 15.3V with integrated protection features including over-current, over-temperature, and reverse polarity protection.

Substiute Parts

SPX3819S-L

MaxLinear, Inc.In Stock: 3323SPX3819S-L Datasheet

Current PartRFQ

MIC5209YM

Microchip TechnologyIn Stock: 17255MIC5209YM Datasheet

MFR RecommendedRFQ

MIC5209YM-TR

Microchip TechnologyIn Stock: 25812MIC5209YM-TR Datasheet

MFR RecommendedRFQ

TL5209DR

Texas InstrumentsIn Stock: 22761TL5209DR Datasheet

MFR RecommendedRFQ

TL5209DRG4

Texas InstrumentsIn Stock: 8395TL5209DRG4 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SPX3819S-L is determined by the following critical parameters:

Mandatory Matching Parameters:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Output Configuration: Positive
• Output Type: Adjustable
• Current - Output: 500mA
• Mounting Type: Surface Mount
• Operating Temperature Range: -40°C ~ 125°C
• Control Features: Enable

Compatible Parameter Ranges:

• Voltage - Input (Max): 16V or greater
• Voltage Dropout (Max): 0.7V @ 500mA or lower
• Protection Features: Must include Over Temperature and Reverse Polarity; Over Current protection is preferred

Output Voltage Flexibility: The SPX3819S-L supports adjustable output from 1.235V to 15.3V. Substitute parts with different minimum or maximum output voltage specifications remain compatible if the application's required output voltage falls within the substitute part's adjustable range.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status):

MIC5209YM and MIC5209YM-TR from Microchip Technology are the preferred substitutes for the SPX3819S-L. Both parts are currently active in production with high inventory availability (17,200 and 25,800 units respectively). These devices match all mandatory parameters and provide improved dropout voltage performance (0.6V vs. 0.7V). The MIC5209YM-TR variant in Cut Tape & Digi-Reel packaging offers superior supply chain continuity. Both variants maintain full protection feature parity and ROHS3 compliance.

Secondary Substitutes (Limited Availability):

TL5209DR from Texas Instruments is available as a Last Time Buy option with 22,700 units in stock. This part meets all mandatory electrical and mechanical requirements but has a restricted output voltage maximum of 6.5V compared to the SPX3819S-L's 15.3V. Applications requiring output voltages above 6.5V cannot use this substitute. The TL5209DR lacks over-current protection, relying only on over-temperature and reverse polarity protection.

TL5209DRG4 from Texas Instruments is classified as obsolete with limited inventory (8,345 units). This part shares identical electrical specifications with TL5209DR, including the 6.5V output voltage limitation and absence of over-current protection. Selection of this part is not recommended for new designs due to obsolete status.

Compliance Considerations:

All substitute parts maintain RoHS compliance (ROHS3 standard). The MIC5209 variants provide REACH Unaffected status, offering additional regulatory assurance for international applications.

Frequently Asked Questions (FAQ)

Q: Can MIC5209YM replace SPX3819S-L in all applications?

A: MIC5209YM is electrically and mechanically compatible with SPX3819S-L for applications requiring output voltages between 1.8V and 15V. The substitute provides superior dropout voltage performance (0.6V vs. 0.7V). Quiescent current is higher (170 µA vs. 8 µA), which may impact battery-powered applications with extended idle periods. Both parts share identical 8-SOIC packaging, enable control features, and comprehensive protection capabilities.

Q: What is the difference between MIC5209YM and MIC5209YM-TR?

A: Both parts are electrically identical. The primary difference is packaging format: MIC5209YM is supplied in Tube packaging, while MIC5209YM-TR uses Cut Tape & Digi-Reel format. MIC5209YM-TR offers higher inventory availability (25,800 vs. 17,200 units) and is preferred for high-volume production environments requiring automated assembly.

Q: Why is TL5209DR not recommended as a primary substitute?

A: TL5209DR has a maximum output voltage of 6.5V, compared to SPX3819S-L's 15.3V maximum. Applications requiring higher output voltages cannot use this part. Additionally, TL5209DR lacks over-current protection, providing only over-temperature and reverse polarity protection. The part is in Last Time Buy status, indicating limited future availability.

Q: Are there any quiescent current differences I should consider?

A: SPX3819S-L has exceptionally low quiescent current of 8 µA. All substitute parts (MIC5209YM, MIC5209YM-TR, TL5209DR, TL5209DRG4) have quiescent current of 170 µA. For battery-powered or ultra-low-power applications where the regulator operates in standby mode for extended periods, this 162 µA difference may require circuit redesign or alternative component selection.

Q: Is the 8-SOIC package identical across all parts?

A: Yes. All parts use 8-SOIC (0.154", 3.90mm Width) packaging with identical pinout and mechanical dimensions. PCB layout and footprints are directly interchangeable without modification.

Q: What protection features should I verify for my application?

A: SPX3819S-L and MIC5209 variants provide three protection layers: over-current, over-temperature, and reverse polarity protection. TL5209 variants provide only over-temperature and reverse polarity protection, lacking over-current protection. Verify your application's fault tolerance requirements before selecting TL5209 alternatives.