LM317LCLP Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317LCLP is a positive adjustable linear voltage regulator IC manufactured by Texas Instruments, designed for applications requiring adjustable output voltage regulation up to 100mA. This device features a TO-92-3 through-hole package and is classified as Last Time Buy, indicating discontinued production with limited inventory availability. Due to its Last Time Buy status, identifying equivalent substitute parts with active production status is essential for long-term design continuity and supply chain reliability.

Substiute Parts

LM317LCLP

Texas InstrumentsIn Stock: 1601LM317LCLP Datasheet

Current PartRFQ

LM317LCDR

Texas InstrumentsIn Stock: 2782LM317LCDR Datasheet

MFR RecommendedRFQ

LM317LCLP

Texas InstrumentsIn Stock: 1601LM317LCLP Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM317LCLP is determined by electrical and mechanical parameter equivalence within the LM317 product family. The primary substitution criterion is functional equivalence across the following parameters:

• Output voltage range: 1.2V to 32V adjustable
• Maximum output current: 100mA
• Maximum input voltage: 38V
• Quiescent current: 2.5 mA
• Protection features: Over Current, Over Temperature, Short Circuit
• Operating temperature range: 0°C ~ 125°C
• Regulatory compliance: ROHS3 Compliant, REACH Unaffected

The LM317LCDR represents a functionally equivalent substitute with identical electrical specifications. The primary difference is packaging format: LM317LCDR uses 8-SOIC surface mount packaging with Active product status, whereas LM317LCLP uses TO-92-3 through-hole packaging with Last Time Buy status. Both devices share the same base product number (LM317) and are manufactured by Texas Instruments.

Parameter Comparison

Engineering Selection Recommendations

The LM317LCDR is the recommended substitute for the LM317LCLP based on the following engineering criteria:

Electrical Equivalence: Both parts share identical electrical specifications across all critical parameters including input/output voltage ranges, output current capability, quiescent current, and protection features. This ensures functional compatibility in circuit applications.

Regulatory Compliance: Both devices maintain ROHS3 Compliance and REACH Unaffected status, satisfying environmental and regulatory requirements for equivalent component selection.

Product Status Advantage: The LM317LCDR carries Active product status, ensuring continued manufacturing availability and supply chain stability. This addresses the Last Time Buy status of the LM317LCLP, which indicates production discontinuation.

Package Consideration: Selection between these parts depends on circuit board design requirements. The LM317LCLP uses through-hole TO-92-3 packaging suitable for breadboard prototyping and through-hole PCB designs. The LM317LCDR uses 8-SOIC surface mount packaging, appropriate for compact PCB layouts and automated assembly processes. Circuit board layout and assembly methodology must determine the appropriate selection.

Frequently Asked Questions (FAQ)

Q: Are the LM317LCLP and LM317LCDR electrically interchangeable?

A: Yes. Both devices share identical electrical specifications including voltage regulation range (1.2V to 32V), output current (100mA), input voltage rating (38V maximum), quiescent current (2.5 mA), and protection features. Electrical performance is equivalent.

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

A: The primary difference is packaging format. The LM317LCLP uses TO-92-3 through-hole packaging for traditional PCB assembly, while the LM317LCDR uses 8-SOIC surface mount packaging for modern automated assembly. Both are manufactured by Texas Instruments and share the same base product number (LM317).

Q: Why is the LM317LCLP marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued production of this part number. Existing inventory is available for purchase, but no future production is planned. The LM317LCDR with Active status represents the recommended path for continued supply.

Q: Can I use the LM317LCDR as a direct replacement in a circuit designed for the LM317LCLP?

A: Electrical substitution is valid. However, physical board layout changes are required due to different package types. The LM317LCLP requires through-hole PCB footprints, while the LM317LCDR requires surface mount footprints. PCB redesign is necessary for mechanical compatibility.

Q: Are both parts compliant with environmental regulations?

A: Yes. Both the LM317LCLP and LM317LCDR are ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory standards for electronic components.

Q: What is the moisture sensitivity level for these parts?

A: The LM317LCLP has Not Applicable moisture sensitivity level. The LM317LCDR has MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for either device.