LM317LCPW Equivalent & Substitute Parts

Part Overview

The LM317LCPW 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 32V, making it suitable for precision power management circuits requiring flexible voltage regulation. The device is currently in Last Time Buy status, indicating end-of-life production. Identifying equivalent substitute parts ensures design continuity and supply chain reliability for applications currently utilizing this component.

Substiute Parts

LM317LCPW

Texas InstrumentsIn Stock: 3941LM317LCPW Datasheet

Current PartRFQ

LM317LCDR

Texas InstrumentsIn Stock: 2782LM317LCDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM317LCPW are identified based on electrical and mechanical compatibility within the LM317 product family. The substitution criteria are strictly defined by the following parameters:

• Base Product Number: Both parts must share the LM317 base designation, ensuring identical electrical characteristics and functional behavior
• Output Configuration & Type: Positive adjustable output with identical voltage range (1.2V to 32V) and current rating (100mA)
• Electrical Specifications: Matching input voltage maximum (38V), quiescent current (2.5mA), PSRR performance (80dB ~ 65dB at 120Hz), and protection features (Over Current, Over Temperature, Short Circuit)
• Operating Temperature Range: Identical 0°C to 125°C specification
• Compliance & Certifications: ROHS3 compliance, MSL Level 1, and REACH Unaffected status must be maintained
• Mounting Type: Surface mount technology required

The primary difference between the main part and substitute lies in package configuration, which affects board layout and assembly compatibility but does not alter electrical performance.

Parameter Comparison

Engineering Selection Recommendations

The LM317LCDR serves as the primary substitute for the LM317LCPW. Both components are manufactured by Texas Instruments and maintain identical electrical specifications across all critical parameters including voltage regulation range, output current, quiescent current, and protection features.

The LM317LCDR is currently in Active product status, ensuring continued availability and supply chain support, whereas the LM317LCPW is designated Last Time Buy. This status difference makes the LM317LCDR the preferred choice for new designs and ongoing production requirements.

Both parts maintain full ROHS3 compliance and REACH Unaffected status, satisfying regulatory requirements for industrial and commercial applications. The MSL Level 1 rating for both components indicates unlimited moisture sensitivity protection, suitable for standard storage and handling conditions.

The package difference between 8-TSSOP and 8-SOIC requires PCB layout modification and assembly process adjustment, but does not affect electrical performance or functional compatibility. Pin configuration and electrical characteristics remain identical between the two packages.

Frequently Asked Questions (FAQ)

Q: Can the LM317LCDR directly replace the LM317LCPW without circuit modification?

A: The LM317LCDR is electrically equivalent to the LM317LCPW and requires no circuit schematic changes. However, the different package types (8-TSSOP versus 8-SOIC) necessitate PCB layout redesign and assembly process updates. Pin assignments and electrical functionality are identical.

Q: What is the primary reason to substitute the LM317LCPW?

A: The LM317LCPW is in Last Time Buy status, indicating end-of-life production. The LM317LCDR is in Active status, ensuring long-term availability and supply chain continuity for current and future production.

Q: Are there any electrical performance differences between these parts?

A: No. Both components share identical electrical specifications including voltage regulation range (1.2V to 32V), output current (100mA), quiescent current (2.5mA), PSRR performance, and protection features. Electrical behavior is functionally equivalent.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the LM317LCPW and LM317LCDR are ROHS3 compliant, REACH Unaffected, and carry MSL Level 1 rating. Regulatory and environmental compliance requirements are identical.

Q: What assembly considerations apply when switching from 8-TSSOP to 8-SOIC packaging?

A: The 8-SOIC package (0.154" width) is narrower than the 8-TSSOP package (0.173" width). PCB footprint design, solder reflow profiles, and pick-and-place machine programming require adjustment. Pin pitch and lead configuration differ between packages, requiring complete PCB layout revision.

Q: Is the LM317LCDR suitable for the same operating temperature range?

A: Yes. Both parts operate across the identical temperature range of 0°C to 125°C, ensuring compatibility in applications with equivalent thermal requirements.