LM140K-12 Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The LM140K-12 is a linear voltage regulator IC manufactured by Texas Instruments, classified as a Power Management (PMIC) component. This positive fixed output regulator delivers 1A at a fixed 12V output and operates across an input voltage range up to 35V. The device is actively produced and widely used in applications requiring stable 12V power regulation with thermal and short-circuit protection. Substitute parts are identified when component availability is limited or when procurement from alternative stock sources is necessary while maintaining identical electrical and mechanical specifications.

Substiute Parts

LM140K-12

Texas InstrumentsIn Stock: 1227LM140K-12 Datasheet

Current PartRFQ

LM140K-12/NOPB

Texas InstrumentsIn Stock: 1136LM140K-12/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM140K-12 are identified based on strict equivalence across all critical electrical and mechanical parameters. The substitution criteria are:

• Fixed output voltage of 12V
• Output current rating of 1A
• Maximum input voltage of 35V
• Voltage dropout specification of 2V @ 1A
• Quiescent current of 6 mA
• PSRR of 72dB (120Hz)
• TO-39-3 Metal Can package (TO-205AD)
• Through-hole mounting configuration
• Operating temperature range of -55°C to 125°C
• Over temperature and short circuit protection features
• Active product status from Texas Instruments

Parts meeting all these parameters are classified as direct parametric equivalents and may be substituted without circuit redesign or performance degradation.

Parameter Comparison

Engineering Selection Recommendations

Both the LM140K-12 and LM140K-12/NOPB are active products from Texas Instruments with identical electrical and mechanical specifications. Selection between these parts should be based on:

• Inventory availability from procurement sources
• REACH compliance status: LM140K-12 is REACH Affected; LM140K-12/NOPB is REACH Unaffected
• Supply chain requirements and regulatory obligations in target markets
• Current stock levels and lead times

For applications subject to REACH regulations, the LM140K-12/NOPB variant is the appropriate selection. Both parts carry ROHS3 compliance and are suitable for industrial and commercial applications across the specified operating temperature range.

Frequently Asked Questions (FAQ)

Q: Can LM140K-12/NOPB be used as a direct replacement for LM140K-12?

A: Yes. Both parts are manufactured by Texas Instruments and share identical electrical parameters, output voltage, current rating, package type, and protection features. The primary difference is REACH compliance status.

Q: What does the "/NOPB" suffix indicate?

A: The "/NOPB" suffix indicates the part is supplied without lead-free plating on the leads. This designation affects REACH compliance classification but does not alter electrical or mechanical performance.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use the TO-39-3 Metal Can package (TO-205AD) with identical through-hole mounting configuration and pinout.

Q: What is the significance of the REACH compliance difference?

A: REACH compliance status is relevant for applications and markets with specific regulatory requirements. The LM140K-12/NOPB variant is REACH Unaffected, making it suitable for applications where REACH compliance is mandatory.

Q: Can these parts be used interchangeably in existing designs?

A: Yes, provided that the application's regulatory and compliance requirements are satisfied by the selected variant. No circuit modifications are required.

Q: What protection features are included in both parts?

A: Both the LM140K-12 and LM140K-12/NOPB include over-temperature protection and short-circuit protection, ensuring safe operation across the specified temperature range.