LM4121AIM5X-1.2 Equivalent & Substitute Parts

Part Overview

The LM4121AIM5X-1.2 is a Series Voltage Reference IC from Texas Instruments, designed to provide a fixed 1.25V output with ±0.2% tolerance. This component is classified as a Power Management (PMIC) device and is packaged in SOT-23-5 (SC-74A, SOT-753). The part is currently marked as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity.

Substiute Parts

LM4121AIM5X-1.2

Texas InstrumentsIn Stock: 3356LM4121AIM5X-1.2 Datasheet

Current PartRFQ

LM4121AIM5-1.2/NOPB

Texas InstrumentsIn Stock: 23243LM4121AIM5-1.2/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the LM4121AIM5X-1.2 is determined by strict equivalence across the following critical parameters:

• Fixed output voltage of 1.25V
• Output tolerance of ±0.2%
• Output current capability of 5 mA
• Temperature coefficient of 50ppm/°C
• Input voltage range of 1.5V ~ 12V
• Supply current of 275µA
• Operating temperature range of -40°C ~ 85°C
• SOT-23-5 package configuration
• Surface mount mounting type

The substitute part LM4121AIM5-1.2/NOPB meets all these electrical and mechanical parameters, providing direct functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The LM4121AIM5-1.2/NOPB is the direct parametric equivalent for the obsolete LM4121AIM5X-1.2. Both parts are manufactured by Texas Instruments and share identical electrical specifications and package configuration. The substitute part carries Last Time Buy status, indicating limited availability but continued support from the manufacturer.

Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current production environments. The substitute part is available in higher inventory quantities (23,148 pcs vs. 3,327 pcs), providing better supply chain accessibility for ongoing production needs.

Frequently Asked Questions (FAQ)

Q: Can LM4121AIM5-1.2/NOPB be used as a direct replacement for LM4121AIM5X-1.2?

A: Yes. Both parts are electrically and mechanically identical across all specified parameters, including output voltage, tolerance, temperature coefficient, noise characteristics, input voltage range, and SOT-23-5 package configuration. No circuit modifications are required.

Q: What is the difference between the two part numbers?

A: The primary difference is product status. LM4121AIM5X-1.2 is Obsolete, while LM4121AIM5-1.2/NOPB is Last Time Buy. The "/NOPB" suffix indicates lead-free (Pb-free) compliance. Both parts meet identical electrical and mechanical specifications.

Q: Are there any compliance or certification differences?

A: No. Both parts are ROHS3 compliant and REACH unaffected. They meet the same regulatory standards for current production environments.

Q: What packaging options are available for the substitute part?

A: The LM4121AIM5-1.2/NOPB is available in Cut Tape (CT) and Digi-Reel® packaging formats, providing flexibility for different procurement and assembly workflows.

Q: Is the SOT-23-5 package the same for both parts?

A: Yes. Both parts use the SC-74A, SOT-753 package designation, ensuring identical PCB footprint and assembly compatibility.