LM1117S-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM1117S-ADJ is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 800mA output current in a surface-mount TO-263 (DDPAK-3) package. The main part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and component sourcing.

Substiute Parts

LM1117S-ADJ

Texas InstrumentsIn Stock: 25247LM1117S-ADJ Datasheet

Current PartRFQ

LM1117S-ADJ/NOPB

Texas InstrumentsIn Stock: 6403LM1117S-ADJ/NOPB Datasheet

DirectRFQ

TLV1117CKTTRG3

Texas InstrumentsIn Stock: 6197TLV1117CKTTRG3 Datasheet

DirectRFQ

TLV1117CKTTR

Texas InstrumentsIn Stock: 7452TLV1117CKTTR Datasheet

MFR RecommendedRFQ

TLV1117IKTTR

Texas InstrumentsIn Stock: 1813TLV1117IKTTR Datasheet

MFR RecommendedRFQ

LT1117CM#TRPBF

Analog Devices Inc.In Stock: 1380LT1117CM#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM1117S-ADJ are qualified based on the following electrical and mechanical parameters:

• Output configuration (positive adjustable)
• Output current rating (800mA)
• Input voltage maximum (15V)
• Output voltage range (1.25V to 13.8V minimum)
• Package type (TO-263 / DDPAK-3)
• Mounting type (surface mount)
• Protection features (over current, over temperature)

Parts meeting these criteria are grouped into direct equivalents and manufacturer-recommended alternatives. Variations in quiescent current, dropout voltage, and operating temperature range are noted but do not disqualify substitution when the primary electrical specifications align.

Parameter Comparison

Engineering Selection Recommendations

LM1117S-ADJ/NOPB is the direct equivalent with active product status and RoHS3 compliance. This part maintains identical electrical specifications to the original LM1117S-ADJ while offering improved compliance status and current availability.

TLV1117CKTTR and TLV1117CKTTRG3 are Texas Instruments alternatives with equivalent output current and package configuration. Both are RoHS3 compliant. These parts exhibit slightly higher quiescent current (10 mA vs. 5 mA) and marginally higher dropout voltage (1.3V vs. 1.2V @ 800mA), which may impact thermal performance in power-limited applications.

TLV1117IKTTR extends the operating temperature range to -40°C ~ 125°C, suitable for industrial and automotive applications requiring lower temperature operation. This part is designated Last Time Buy, indicating limited future availability.

LT1117CM#TRPBF from Analog Devices Inc. provides an active, cross-manufacturer alternative with matching electrical specifications and RoHS3 compliance. This option supports supply chain diversification and long-term availability.

Frequently Asked Questions (FAQ)

Q: Can LM1117S-ADJ/NOPB be used as a direct replacement for LM1117S-ADJ?

A: Yes. LM1117S-ADJ/NOPB is electrically and mechanically identical to the original part. The primary difference is RoHS3 compliance and active product status. Both share identical output current (800mA), voltage specifications (1.25V to 13.8V), dropout voltage (1.2V @ 800mA), and TO-263 packaging.

Q: What are the trade-offs when substituting TLV1117CKTTR for LM1117S-ADJ?

A: TLV1117CKTTR maintains 800mA output current and TO-263 packaging but exhibits higher quiescent current (10 mA vs. 5 mA) and slightly higher dropout voltage (1.3V vs. 1.2V @ 800mA). These differences increase power dissipation and heat generation, particularly in low-input-voltage or high-current applications. Operating temperature range remains 0°C ~ 125°C.

Q: Is LT1117CM#TRPBF compatible with LM1117S-ADJ designs?

A: Yes. LT1117CM#TRPBF matches the electrical specifications of LM1117S-ADJ, including 800mA output current, 1.25V to 13.8V output range, and 1.2V dropout voltage @ 800mA. The DDPAK-3 package is mechanically compatible with TO-263. The primary advantage is active product status and cross-manufacturer sourcing.

Q: Why does TLV1117IKTTR have a different operating temperature range?

A: TLV1117IKTTR is specified for -40°C ~ 125°C operation, extending the lower temperature limit from 0°C to -40°C. This variant is intended for industrial, automotive, and military applications requiring operation in cold environments. All other electrical specifications remain equivalent to other TLV1117 variants.

Q: What is the significance of RoHS compliance in these substitutes?

A: RoHS3 compliance indicates the part meets current environmental and hazardous substance restrictions. LM1117S-ADJ is RoHS non-compliant, while all substitute parts listed are ROHS3 compliant. This is relevant for new designs, regulatory requirements, and long-term supply chain sustainability.

Q: Can multiple substitute parts be used interchangeably in production?

A: Parts within the same electrical specification group (LM1117S-ADJ/NOPB, TLV1117CKTTR, TLV1117CKTTRG3, LT1117CM#TRPBF) are mechanically and electrically interchangeable for standard applications. However, thermal performance differences due to quiescent current and dropout voltage variations should be evaluated in power-constrained designs. Qualification testing is recommended before production transition.