LM317LZRP Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM317LZRP is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications with 100mA current capability in a TO-92 package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The LM317LZRP provides adjustable output voltage regulation from 1.2V to 37V with integrated protection features including over-current, over-temperature, and short-circuit protection.

Substiute Parts

LM317LZRP

onsemiIn Stock: 1120LM317LZRP Datasheet

Current PartRFQ

LM317LZRPG

onsemiIn Stock: 1314LM317LZRPG Datasheet

DirectRFQ

LM317LZRMG

onsemiIn Stock: 3062LM317LZRMG Datasheet

Parametric EquivalentRFQ

LM217LZ-TR

STMicroelectronicsIn Stock: 5201LM217LZ-TR Datasheet

SimilarRFQ

LM317LCLPR

Texas InstrumentsIn Stock: 10948LM317LCLPR Datasheet

SimilarRFQ

LM317LZ-AP

STMicroelectronicsIn Stock: 17987LM317LZ-AP Datasheet

SimilarRFQ

LM317LZ-TR

STMicroelectronicsIn Stock: 1994LM317LZ-TR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM317LZRP are classified based on the following substitution criteria:

Direct Manufacturer Substitutes maintain identical electrical and mechanical specifications from the original manufacturer (onsemi), differing only in packaging format or product status. These parts share the same base product number (LM317) and are pin-compatible with identical TO-92 package geometry.

Parametric Equivalents are parts from the same manufacturer that meet all critical electrical parameters: 40V maximum input voltage, 1.2V to 37V adjustable output range, 100mA output current, and identical protection features. These parts are functionally interchangeable in circuit applications.

Similar Parts from Alternative Manufacturers (STMicroelectronics, Texas Instruments) provide equivalent functionality with the same TO-92 package and electrical performance envelope. Substitution is valid when all critical parameters align: positive adjustable output, 100mA current capability, 40V input maximum, and identical protection features.

Key Parameters Determining Substitutability:

• Output Configuration: Positive (all substitutes)
• Output Type: Adjustable (all substitutes)
• Current - Output: 100mA (all substitutes)
• Package / Case: TO-92-3 compatible (all substitutes)
• Protection Features: Over Temperature and Short Circuit minimum (all substitutes)
• Operating Temperature Range: 0°C ~ 125°C minimum (all substitutes)

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM317LZRPG (onsemi)

The LM317LZRPG is the direct successor to the LM317LZRP, maintaining identical electrical specifications and TO-92 package compatibility. This part carries Active product status and ROHS3 compliance, providing long-term availability and regulatory alignment. The only difference from the original part is packaging format (Cut Tape vs. bulk) and RoHS certification status.

Secondary Recommendation: LM317LZRMG (onsemi)

The LM317LZRMG offers identical electrical performance to the LM317LZRP with Active product status and superior inventory availability (3014 Pcs). This part maintains the same quiescent current specification (10 mA) and is fully compatible with existing circuit designs.

Alternative Recommendation: LM317LZ-AP or LM317LZ-TR (STMicroelectronics)

Both STMicroelectronics parts meet all critical electrical parameters and maintain Active product status. The LM317LZ-AP and LM317LZ-TR feature lower quiescent current (5 mA vs. 10 mA), which may provide power efficiency benefits in battery-powered applications. Both parts are ROHS3 compliant and available in TO-92-3 package.

Not Recommended: LM317LCLPR (Texas Instruments)

While functionally similar, the LM317LCLPR carries Last Time Buy status, indicating discontinued production. Additionally, this part specifies reduced maximum input voltage (38V vs. 40V) and lower maximum output voltage (32V vs. 37V), which may limit application flexibility. The lower quiescent current (2.5 mA) does not offset the availability and specification constraints.

Not Recommended: LM217LZ-TR (STMicroelectronics)

The LM217LZ-TR is a different product line (LM217 vs. LM317) with different electrical characteristics. While pin-compatible in TO-92 package, this part should only be selected if the application specifically requires LM217 specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM317LZRP with LM317LZRPG in my existing design?

A: Yes. The LM317LZRPG is electrically and mechanically identical to the LM317LZRP. Both parts share the same TO-92-3 package geometry, pin configuration, and electrical specifications (40V input, 1.2V-37V adjustable output, 100mA current). The primary difference is product status (Active vs. Obsolete) and RoHS compliance.

Q: What is the difference between LM317LZRPG and LM317LZRMG?

A: Both parts are onsemi LM317 regulators with identical electrical specifications. The difference lies in packaging format: LM317LZRPG is supplied in Cut Tape (CT) packaging, while LM317LZRMG is also in Cut Tape format. Both are ROHS3 compliant and Active status. Selection between them depends on inventory availability and supplier preference.

Q: Can I use STMicroelectronics LM317LZ-AP instead of the onsemi LM317LZRP?

A: Yes, with consideration of quiescent current differences. The LM317LZ-AP maintains identical output voltage range (1.2V-37V), input voltage rating (40V), and output current (100mA). However, the quiescent current is 5 mA versus 10 mA in the original part. This lower quiescent current may improve power efficiency but does not affect functional compatibility in most applications.

Q: Why is the LM317LCLPR (Texas Instruments) not recommended as a substitute?

A: The LM317LCLPR carries Last Time Buy status, indicating production discontinuation and limited future availability. Additionally, this part specifies lower maximum ratings: 38V input (vs. 40V) and 32V maximum output (vs. 37V). These reduced specifications may not support all applications designed for the original LM317LZRP.

Q: Are all substitute parts available in the same TO-92 package?

A: Yes. All recommended substitute parts use TO-92-3 or TO-226-3 package designations, which are mechanically and electrically compatible. Pin configuration and lead spacing are identical across all listed parts, enabling direct PCB-level substitution without layout modifications.

Q: What is the significance of ROHS3 compliance in these parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. The original LM317LZRP is RoHS non-compliant, while all recommended substitutes (LM317LZRPG, LM317LZRMG, and STMicroelectronics variants) are ROHS3 compliant. This compliance status is important for applications subject to EU regulations or customer requirements.

Q: Can I use LM217LZ-TR as a substitute for LM317LZRP?

A: LM217LZ-TR is a different product line (LM217 base number vs. LM317). While both are adjustable linear regulators in TO-92 packages, they have different electrical characteristics and should not be considered interchangeable unless your application specifically requires LM217 specifications. Consult the respective datasheets for detailed differences.