SPX2954AS-L-5-0 Equivalent & Substitute Parts

Part Overview

The SPX2954AS-L-5-0 is a linear voltage regulator IC from MaxLinear, Inc., designed for positive fixed 5V output at 250mA in an 8-SOIC surface mount package. This component is classified as a Power Management (PMIC) device and is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs.

Substiute Parts

SPX2954AS-L-5-0

MaxLinear, Inc.In Stock: 986SPX2954AS-L-5-0 Datasheet

Current PartRFQ

LP2951-50QDRQ1

Texas InstrumentsIn Stock: 23497LP2951-50QDRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SPX2954AS-L-5-0 is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Output voltage configuration: Positive fixed 5V output
• Maximum input voltage: 30V or greater
• Output current capability: Minimum 100mA (note: substitute provides lower current rating)
• Voltage dropout: Maximum 0.6V or lower
• Operating temperature range: -40°C to 125°C or wider
• Package type: 8-SOIC surface mount

Functional Compatibility:

• Enable control feature
• Over current and over temperature protection
• Surface mount technology compatibility

The LP2951-50QDRQ1 from Texas Instruments meets these substitution criteria with compatible electrical specifications and identical package geometry, enabling direct replacement in PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

The LP2951-50QDRQ1 is the manufacturer-recommended substitute for the discontinued SPX2954AS-L-5-0. Selection of this alternative is supported by the following factors:

Product Availability: The LP2951-50QDRQ1 maintains active product status with substantial inventory availability (23,477 pcs), ensuring supply chain continuity for new designs and production requirements.

Compliance & Certification: The substitute part carries ROHS3 compliance and AEC-Q100 automotive qualification, exceeding the RoHS compliance of the original part. This enhanced qualification status provides additional assurance for applications requiring automotive-grade reliability.

Electrical Compatibility: Both devices operate within identical input voltage ranges (30V maximum), temperature ranges (-40°C to 125°C), and package geometry (8-SOIC). The substitute provides enhanced protection features including short circuit protection in addition to over current and over temperature protection.

Current Rating Consideration: The LP2951-50QDRQ1 provides 100mA output current versus the original 250mA specification. Applications requiring the full 250mA output current must evaluate alternative parts with higher current ratings or implement load distribution strategies.

Frequently Asked Questions (FAQ)

Q: Can the LP2951-50QDRQ1 directly replace the SPX2954AS-L-5-0 in existing PCB designs?

A: Yes, direct PCB replacement is possible due to identical 8-SOIC package geometry and pinout compatibility. However, the reduced output current rating (100mA vs. 250mA) must be evaluated against circuit load requirements.

Q: What is the primary limitation of the LP2951-50QDRQ1 as a substitute?

A: The output current capability is reduced from 250mA to 100mA. Applications drawing more than 100mA from the 5V output require alternative parts with higher current ratings or circuit redesign.

Q: Are there functional differences in control features between these parts?

A: The original SPX2954AS-L-5-0 includes both Enable and Power On Reset control features. The LP2951-50QDRQ1 provides Enable control but does not include Power On Reset functionality. Circuit designs dependent on Power On Reset behavior require evaluation of alternative substitutes.

Q: Does the LP2951-50QDRQ1 provide better protection than the original part?

A: Yes. The substitute includes over current, over temperature, and short circuit protection, compared to over current and over temperature protection in the original part. Enhanced short circuit protection provides additional circuit safeguarding.

Q: Is the LP2951-50QDRQ1 suitable for automotive applications?

A: Yes. The substitute carries AEC-Q100 automotive qualification and automotive-grade designation, making it suitable for automotive applications. The original SPX2954AS-L-5-0 does not specify automotive qualification.

Q: What are the quiescent current differences?

A: The LP2951-50QDRQ1 draws 120 µA quiescent current compared to 170 µA for the SPX2954AS-L-5-0, representing approximately 29% lower standby power consumption.