LM1117T-ADJ Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM1117T-ADJ is a positive adjustable linear voltage regulator IC manufactured by Texas Instruments, designed for applications requiring 800mA output current with adjustable output voltage from 1.25V to 13.8V. The device is classified as obsolete, which necessitates identification of active equivalent and substitute parts for new designs and ongoing production support. This reference provides direct substitutes and manufacturer-recommended alternatives that maintain electrical and mechanical compatibility within the TO-220-3 package.

Substiute Parts

LM1117T-ADJ

Texas InstrumentsIn Stock: 77456LM1117T-ADJ Datasheet

Current PartRFQ

LM1117T-ADJ/NOPB

Texas InstrumentsIn Stock: 3143LM1117T-ADJ/NOPB Datasheet

DirectRFQ

TLV1117CKCS

Texas InstrumentsIn Stock: 3983TLV1117CKCS Datasheet

MFR RecommendedRFQ

TLV1117IKCS

Texas InstrumentsIn Stock: 2156TLV1117IKCS Datasheet

MFR RecommendedRFQ

TLV1117IKCSE3

Texas InstrumentsIn Stock: 1666TLV1117IKCSE3 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM1117T-ADJ is determined by the following critical parameters that must remain constant across all equivalent parts:

• Package / Case: TO-220-3 (mechanical and thermal compatibility)
• Output Configuration: Positive
• Output Type: Adjustable
• Voltage - Input (Max): 15V
• Voltage - Output (Min/Fixed): 1.25V
• Current - Output: 800mA
• Protection Features: Over Current, Over Temperature
• Mounting Type: Through Hole

The substitute parts identified below maintain these core electrical and mechanical specifications. Variations in secondary parameters such as voltage dropout, quiescent current, and operating temperature range are noted in the comparison table and do not affect functional substitution within the specified design envelope.

Parameter Comparison

Engineering Selection Recommendations

LM1117T-ADJ/NOPB is the direct equivalent substitute for the obsolete LM1117T-ADJ. This part maintains identical electrical specifications including voltage dropout and quiescent current characteristics. The primary distinction is product status: LM1117T-ADJ/NOPB is active and ROHS3 compliant, making it the preferred choice for new designs and production continuity.

TLV1117CKCS is an active manufacturer-recommended alternative from Texas Instruments. This part operates within the commercial temperature range (0°C ~ 125°C) and maintains all critical electrical parameters. The TLV1117 series exhibits slightly higher voltage dropout (1.3V vs. 1.2V) and quiescent current (10mA vs. 5mA), which may impact thermal performance in power-sensitive applications. ROHS3 compliance is confirmed.

TLV1117IKCS and TLV1117IKCSE3 are manufacturer-recommended alternatives with extended operating temperature range (-40°C ~ 125°C), suitable for industrial and automotive applications. Both parts carry Last Time Buy status, indicating limited future availability. These variants share the same electrical characteristics as TLV1117CKCS with the addition of low-temperature operation capability. ROHS3 compliance is confirmed for both variants.

For new production designs, LM1117T-ADJ/NOPB is the primary recommendation due to active status and direct specification match. For applications requiring extended temperature range, TLV1117IKCS or TLV1117IKCSE3 provide suitable alternatives with the understanding that these parts are in Last Time Buy status.

Frequently Asked Questions (FAQ)

Q: Can LM1117T-ADJ/NOPB be used as a direct replacement for LM1117T-ADJ?

A: Yes. LM1117T-ADJ/NOPB is electrically and mechanically identical to LM1117T-ADJ. The primary difference is product status: LM1117T-ADJ/NOPB is active and ROHS3 compliant, while LM1117T-ADJ is obsolete and RoHS non-compliant. No circuit modifications are required.

Q: What is the difference between LM1117T-ADJ/NOPB and TLV1117CKCS?

A: Both parts are active and ROHS3 compliant. LM1117T-ADJ/NOPB maintains the original LM1117 specifications with 1.2V dropout and 5mA quiescent current. TLV1117CKCS exhibits 1.3V dropout and 10mA quiescent current. For applications with tight thermal budgets or low-power requirements, LM1117T-ADJ/NOPB is preferred. TLV1117CKCS is suitable for general-purpose applications where the increased dropout and quiescent current are acceptable.

Q: Are TLV1117IKCS and TLV1117IKCSE3 suitable for new designs?

A: Both parts are functionally suitable and ROHS3 compliant. However, both carry Last Time Buy status, indicating limited future availability. For new designs with extended temperature requirements (-40°C ~ 125°C), these parts are acceptable with the understanding that long-term supply cannot be guaranteed. For designs without extended temperature requirements, LM1117T-ADJ/NOPB or TLV1117CKCS are recommended for better supply continuity.

Q: Do all substitute parts use the same TO-220-3 package?

A: Yes. All substitute parts identified in this reference use the TO-220-3 package, ensuring mechanical and thermal compatibility with the original LM1117T-ADJ. No PCB layout modifications are required for substitution.

Q: What is the impact of increased voltage dropout in TLV1117 variants?

A: The TLV1117 series exhibits 1.3V dropout compared to 1.2V in the LM1117T-ADJ/NOPB. This 0.1V difference increases power dissipation and heat generation, particularly at maximum output current (800mA). In applications with marginal input voltage headroom or high ambient temperature, thermal performance may be affected. Verify that the power supply input voltage and thermal design accommodate the higher dropout specification.

Q: Are all substitute parts RoHS compliant?

A: LM1117T-ADJ/NOPB, TLV1117CKCS, TLV1117IKCS, and TLV1117IKCSE3 are all ROHS3 compliant. The original LM1117T-ADJ is RoHS non-compliant. For applications requiring RoHS compliance, any of the substitute parts are acceptable.