SPX2954S-L-5-0 Equivalent & Substitute Parts

Part Overview

The SPX2954S-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 device is classified as a Power Management (PMIC) component and is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives for ongoing design requirements and production needs.

Substiute Parts

SPX2954S-L-5-0

MaxLinear, Inc.In Stock: 4144SPX2954S-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 SPX2954S-L-5-0 is determined by the following critical parameters:

• Package Compatibility: 8-SOIC surface mount package (0.154", 3.90mm Width)
• Output Voltage: Fixed 5V output requirement
• Maximum Input Voltage: 30V maximum rating
• Operating Temperature Range: -40°C ~ 125°C
• Output Current Capability: Minimum 250mA required for direct replacement
• Control Features: Enable and Power On Reset functionality
• Protection Features: Over Current and Over Temperature protection

The LP2951-50QDRQ1 from Texas Instruments qualifies as a substitute based on matching package type, input voltage rating, operating temperature range, and protection features. However, the output current rating differs, requiring application-level evaluation.

Parameter Comparison

Engineering Selection Recommendations

The LP2951-50QDRQ1 is an active product from Texas Instruments with ROHS3 compliance and AEC-Q100 automotive qualification, providing supply continuity for the discontinued SPX2954S-L-5-0. Both devices share identical package geometry, input voltage rating, and operating temperature range.

The primary design consideration is output current capacity: the LP2951-50QDRQ1 provides 100mA maximum output versus 250mA for the SPX2954S-L-5-0. Direct substitution is applicable only in applications where load current does not exceed 100mA. For applications requiring the full 250mA output capability of the original part, alternative regulators with higher current ratings in the same package must be evaluated.

The LP2951-50QDRQ1 offers enhanced protection features including short circuit protection and automotive-grade qualification, which may provide additional reliability benefits in applicable designs.

Frequently Asked Questions (FAQ)

Q: Can the LP2951-50QDRQ1 directly replace the SPX2954S-L-5-0 in all applications?

A: Direct substitution is limited by output current rating. The LP2951-50QDRQ1 provides 100mA maximum output, while the SPX2954S-L-5-0 provides 250mA. Substitution is valid only for applications where load current does not exceed 100mA.

Q: Are the packages physically identical?

A: Yes. Both devices use the 8-SOIC package with 0.154" (3.90mm) width, enabling identical PCB footprints and board-level compatibility.

Q: What are the key electrical differences between these parts?

A: The primary differences are output current capacity (250mA vs. 100mA), quiescent current (170 µA vs. 120 µA), and dropout voltage specifications. The LP2951-50QDRQ1 includes additional short circuit protection and automotive qualification.

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

A: Yes. The LP2951-50QDRQ1 carries AEC-Q100 automotive qualification and automotive-grade designation, making it suitable for automotive environments. The original SPX2954S-L-5-0 does not carry automotive qualification.

Q: What is the impact of the adjustable output feature on the LP2951-50QDRQ1?

A: The LP2951-50QDRQ1 is configurable as adjustable or fixed output. When configured for fixed 5V output (as indicated by the -50 suffix), it functions equivalently to the fixed-output SPX2954S-L-5-0 for this parameter.