LM317LIBPX Equivalent & Substitute Parts

Part Overview

The LM317LIBPX is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 100mA output current with an adjustable voltage range from 1.2V to 37V, suitable for power management applications requiring precision voltage regulation. The device is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements.

Substiute Parts

LM317LIBPX

Texas InstrumentsIn Stock: 899LM317LIBPX Datasheet

Current PartRFQ

LM317LITP/NOPB

Texas InstrumentsIn Stock: 15225LM317LITP/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM317LIBPX is determined by strict equivalence across the following critical parameters:

• Base product number (LM317 series)
• Output configuration (Positive adjustable)
• Voltage specifications (Input max 40V, Output 1.2V to 37V)
• Current rating (100mA output)
• Operating temperature range (-40°C to 125°C)
• Package type (6-DSBGA / 6-UFBGA)
• Protection features (Over Current, Over Temperature, Short Circuit)

The LM317LITP/NOPB qualifies as a direct substitute based on identical electrical specifications and compatible packaging. The primary distinction is product status: LM317LITP/NOPB is active and available in higher inventory quantities, whereas LM317LIBPX is obsolete.

Parameter Comparison

Engineering Selection Recommendations

The LM317LITP/NOPB is the direct substitute for LM317LIBPX based on electrical and functional equivalence. Selection of LM317LITP/NOPB is supported by the following factors:

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance meets current regulatory requirements, whereas LM317LIBPX is RoHS non-compliant
• Identical electrical specifications across all critical parameters (voltage, current, temperature range, protection features)
• Compatible 6-DSBGA package footprint
• Higher inventory availability (15203 units versus 851 units)

The quiescent current difference (5 mA versus 2.5 mA) is within acceptable tolerance for most applications and does not preclude substitution.

Frequently Asked Questions (FAQ)

Q: Can LM317LITP/NOPB be used as a direct replacement for LM317LIBPX?

A: Yes. Both devices share identical electrical specifications, including voltage range (1.2V to 37V output), current rating (100mA), operating temperature (-40°C to 125°C), and protection features. The 6-DSBGA package is compatible between both parts.

Q: What is the difference in quiescent current between these parts?

A: LM317LIBPX has a quiescent current of 2.5 mA, while LM317LITP/NOPB has 5 mA. This difference does not affect functional substitution for standard applications and remains within acceptable operating parameters.

Q: Why is LM317LIBPX listed as obsolete?

A: Product obsolescence is determined by manufacturer lifecycle status. LM317LITP/NOPB is the active equivalent and recommended for new designs and production.

Q: Are there packaging differences between these parts?

A: Both use the 6-DSBGA supplier device package. LM317LIBPX is supplied in bulk packaging, while LM317LITP/NOPB is supplied in Tape & Reel (TR) format, which is standard for production environments.

Q: Does RoHS compliance affect substitution?

A: LM317LITP/NOPB is ROHS3 compliant, whereas LM317LIBPX is RoHS non-compliant. For applications requiring RoHS compliance, LM317LITP/NOPB is the appropriate selection.

Q: Are the PSRR specifications identical?

A: Yes. Both devices have identical Power Supply Rejection Ratio specifications of 80dB ~ 65dB at 120Hz.