LM317LILPR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317LILPR is a positive adjustable linear voltage regulator IC manufactured by Texas Instruments, designed for applications requiring adjustable output voltage regulation up to 100mA. The device features integrated over-current, over-temperature, and short-circuit protection. This part is classified as Last Time Buy, indicating end-of-life status. Finding equivalent substitute parts is necessary to ensure design continuity and long-term supply chain reliability for new production runs and ongoing maintenance applications.

Substiute Parts

LM317LILPR

Texas InstrumentsIn Stock: 3485LM317LILPR Datasheet

Current PartRFQ

LM317LIDR

Texas InstrumentsIn Stock: 10194LM317LIDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM317LILPR is determined by strict electrical and mechanical parameter matching. The following criteria define valid substitute relationships:

Electrical Parameters (Must Match):

• Output Configuration: Positive
• Output Type: Adjustable
• Number of Regulators: 1
• Voltage - Input (Max): 38V
• Voltage - Output (Min/Fixed): 1.2V
• Voltage - Output (Max): 32V
• Current - Output: 100mA
• Current - Quiescent (Iq): 2.5 mA
• PSRR: 80dB ~ 65dB (120Hz)
• Protection Features: Over Current, Over Temperature, Short Circuit
• Operating Temperature: -40°C ~ 125°C

Mechanical Parameters (May Differ):

• Mounting Type (Through Hole vs. Surface Mount)
• Package / Case (TO-92-3 vs. 8-SOIC)

The LM317LIDR qualifies as a direct electrical substitute with identical performance specifications. The primary difference is packaging: LM317LILPR uses Through Hole mounting in TO-92-3 package, while LM317LIDR uses Surface Mount in 8-SOIC package. Both parts share the same base product number (LM317) and maintain full electrical compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LM317LIDR is the manufacturer-recommended substitute for the LM317LILPR. Both parts maintain identical electrical specifications and regulatory compliance (ROHS3 Compliant, REACH Unaffected). The LM317LIDR offers the additional advantage of Active product status, ensuring continued availability and long-term supply chain support compared to the Last Time Buy status of the LM317LILPR.

Selection between these parts depends on circuit board design requirements:

• LM317LILPR (Through Hole, TO-92-3): Suitable for through-hole PCB designs, breadboard prototyping, and legacy circuit board layouts.
• LM317LIDR (Surface Mount, 8-SOIC): Suitable for surface-mount PCB designs, high-density layouts, and modern manufacturing processes.

Both parts deliver equivalent electrical performance and protection characteristics. PCB layout and assembly process capabilities determine the appropriate choice.

Frequently Asked Questions (FAQ)

Q: Can LM317LIDR replace LM317LILPR in an existing design?

A: Electrical substitution is complete. However, the LM317LIDR requires surface-mount assembly capability and PCB redesign to accommodate the 8-SOIC package footprint, whereas the LM317LILPR uses through-hole TO-92-3 leads. Direct pin-for-pin replacement on existing through-hole boards is not possible without circuit board modification.

Q: Are the output voltage ranges identical between these parts?

A: Yes. Both parts provide adjustable output voltage from 1.2V to 32V with identical input voltage tolerance (38V maximum) and output current capability (100mA).

Q: What is the significance of the Last Time Buy status for LM317LILPR?

A: Last Time Buy indicates the manufacturer will discontinue production. The LM317LIDR, with Active status, represents the recommended path for ongoing production and future designs to ensure uninterrupted supply chain access.

Q: Do both parts require identical external component values for the same output voltage?

A: Yes. The adjustment network (reference voltage and resistor divider) operates identically on both parts, allowing the same external component values to achieve equivalent output voltage regulation.

Q: Are there differences in thermal performance between the packages?

A: The 8-SOIC package (LM317LIDR) and TO-92-3 package (LM317LILPR) have different thermal characteristics. Thermal design calculations should account for the specific package thermal resistance when operating near maximum current or temperature limits.

Q: What compliance certifications apply to both parts?

A: Both LM317LILPR and LM317LIDR are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.