LM317LCPWR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317LCPWR is a positive adjustable linear voltage regulator IC manufactured by Texas Instruments, designed for applications requiring regulated output voltage between 1.2V and 32V at up to 100mA output current. This device is classified as Last Time Buy, indicating discontinued production with limited inventory availability. Finding equivalent substitute parts is necessary to ensure design continuity and long-term supply chain reliability for new production runs and future maintenance requirements.

Substiute Parts

LM317LCPWR

Texas InstrumentsIn Stock: 4464LM317LCPWR Datasheet

Current PartRFQ

LM317LCDR

Texas InstrumentsIn Stock: 2782LM317LCDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM317LCPWR is determined by electrical and mechanical compatibility across the following critical parameters:

Electrical compatibility requires matching output configuration (Positive), output type (Adjustable), number of regulators (1), voltage specifications (Input Max 38V, Output Min 1.2V, Output Max 32V), current rating (100mA), quiescent current (2.5mA), PSRR performance (80dB ~ 65dB at 120Hz), and protection features (Over Current, Over Temperature, Short Circuit).

Mechanical compatibility requires surface mount mounting type and compliance with RoHS3, MSL Level 1, and REACH standards.

The LM317LCDR qualifies as a direct substitute based on identical electrical specifications and compliance certifications. The primary difference is packaging format: LM317LCPWR uses 8-TSSOP (0.173", 4.40mm Width) while LM317LCDR uses 8-SOIC (0.154", 3.90mm Width). Both packages are surface mount with equivalent pin configurations for the LM317 base product number.

Parameter Comparison

Engineering Selection Recommendations

The LM317LCDR is the manufacturer-recommended substitute for the LM317LCPWR. Both parts maintain identical electrical performance specifications and regulatory compliance (ROHS3, REACH Unaffected, MSL Level 1).

Selection between these parts is determined by PCB layout requirements and available board space. The LM317LCPWR in 8-TSSOP package (4.40mm width) accommodates designs with larger component spacing, while the LM317LCDR in 8-SOIC package (3.90mm width) suits space-constrained layouts. Pin configuration and electrical function remain equivalent across both packages.

The LM317LCDR carries Active product status, ensuring continued availability and supply chain stability compared to the Last Time Buy status of the LM317LCPWR. For new designs and production continuity, the LM317LCDR is the preferred selection.

Frequently Asked Questions (FAQ)

Q: Can LM317LCDR replace LM317LCPWR in existing designs?

A: Yes, provided PCB layout accommodates the 8-SOIC package (3.90mm width) instead of 8-TSSOP (4.40mm width). Electrical specifications and pin functions are identical. Board redesign may be required for package footprint compatibility.

Q: What is the primary difference between these substitute parts?

A: The only difference is packaging format. LM317LCPWR uses 8-TSSOP while LM317LCDR uses 8-SOIC. All electrical parameters, output voltage range (1.2V to 32V), current rating (100mA), and protection features are identical.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both LM317LCPWR and LM317LCDR are ROHS3 compliant, REACH unaffected, and carry MSL Level 1 (unlimited moisture sensitivity protection).

Q: Why is LM317LCPWR marked as Last Time Buy?

A: Last Time Buy status indicates Texas Instruments has discontinued production of this specific package variant. The LM317LCDR in 8-SOIC package remains in active production, providing long-term supply availability.

Q: Can these parts be used interchangeably on the same PCB?

A: No. Each part requires its specific package footprint (8-TSSOP or 8-SOIC). PCB redesign is necessary to switch between package types. However, electrical function and performance are fully interchangeable.