LM4121IM5-ADJ Equivalent & Substitute Parts

Part Overview

The LM4121IM5-ADJ is a Series Voltage Reference IC manufactured by Texas Instruments, designed for adjustable output applications in power management circuits. This component operates with an adjustable output range from 1.216V to 12V, delivering up to 5mA output current with ±0.5% tolerance. The part is classified as Obsolete, making identification of compatible substitutes essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Texas Instruments
Part Number	LM4121IM5-ADJ
Category	Power Management (PMIC)
Reference Type	Series
Output Type	Adjustable
Voltage Output Range	1.216V to 12V
Output Current	5mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C
Input Voltage Range	1.5V to 12V
Supply Current	275µA
Operating Temperature	-40°C to 85°C
Package	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the LM4121IM5-ADJ is determined by strict equivalence across all electrical and mechanical parameters. The substitute parts identified maintain identical specifications for voltage reference functionality, output range, current delivery, tolerance, temperature coefficient, noise characteristics, input voltage range, supply current, operating temperature range, and package configuration.

The key parameters governing substitution are:

Output voltage range (1.216V to 12V)
Output current capability (5mA)
Tolerance specification (±0.5%)
Temperature coefficient (50ppm/°C)
Noise performance (20µVp-p at 0.1Hz to 10Hz; 30µVrms at 10Hz to 10kHz)
Input voltage range (1.5V to 12V)
Supply current (275µA)
Operating temperature range (-40°C to 85°C)
Package type (SOT-23-5)

All identified substitutes meet these criteria without deviation.

Parameter Comparison

Parameter	LM4121IM5-ADJ	LM4121IM5-ADJ/NOPB	LM4121IM5X-ADJ/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Reference Type	Series	Series	Series
Output Type	Adjustable	Adjustable	Adjustable
Voltage Output (Min/Fixed)	1.216V	1.216V	1.216V
Voltage Output (Max)	12V	12V	12V
Output Current	5mA	5mA	5mA
Tolerance	±0.5%	±0.5%	±0.5%
Temperature Coefficient	50ppm/°C	50ppm/°C	50ppm/°C
Noise (0.1Hz to 10Hz)	20µVp-p	20µVp-p	20µVp-p
Noise (10Hz to 10kHz)	30µVrms	30µVrms	30µVrms
Input Voltage Range	1.5V to 12V	1.5V to 12V	1.5V to 12V
Supply Current	275µA	275µA	275µA
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 85°C
Package / Case	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	SOT-23-5	SOT-23-5	SOT-23-5
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Last Time Buy	Last Time Buy
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Packaging Type	Not specified	Cut Tape (CT)	Tape & Reel (TR)

Engineering Selection Recommendations

The LM4121IM5-ADJ is designated as Obsolete. For new designs and production continuity, LM4121IM5-ADJ/NOPB and LM4121IM5X-ADJ/NOPB are the identified substitutes, both classified as Last Time Buy.

LM4121IM5-ADJ/NOPB is supplied in Cut Tape (CT) packaging and carries ROHS3 compliance certification, making it suitable for applications requiring RoHS compliance.

LM4121IM5X-ADJ/NOPB is supplied in Tape & Reel (TR) packaging and also carries ROHS3 compliance certification, making it appropriate for high-volume production environments.

Both substitutes maintain full electrical and mechanical equivalence to the original part. Selection between them depends on packaging requirements and procurement volume. Both parts carry REACH Unaffected status and EAR99 export classification.

Frequently Asked Questions (FAQ)

Q: Can LM4121IM5-ADJ/NOPB and LM4121IM5X-ADJ/NOPB be used interchangeably with LM4121IM5-ADJ?

A: Yes. All three parts are electrically and mechanically equivalent. They share identical voltage reference specifications, output characteristics, noise performance, and SOT-23-5 package configuration. The differences are limited to product status and packaging format.

Q: What is the difference between Cut Tape and Tape & Reel packaging?

A: Cut Tape (CT) packaging is supplied in smaller quantities on individual tape strips, suitable for lower-volume applications. Tape & Reel (TR) packaging is supplied on continuous reels, optimized for automated assembly in high-volume production. Both formats contain the same component in the same SOT-23-5 package.

Q: Why is the original LM4121IM5-ADJ marked as Obsolete?

A: Obsolete status indicates the part is no longer in active production. The identified substitutes (LM4121IM5-ADJ/NOPB and LM4121IM5X-ADJ/NOPB) are classified as Last Time Buy, meaning they remain available for a limited period before discontinuation. Procurement planning should account for this timeline.

Q: Are there RoHS compliance differences between the substitutes and the original part?

A: Yes. The original LM4121IM5-ADJ is RoHS non-compliant. Both substitutes (LM4121IM5-ADJ/NOPB and LM4121IM5X-ADJ/NOPB) are ROHS3 compliant. For applications requiring RoHS compliance, either substitute is appropriate.

Q: Do all three parts have the same electrical performance?

A: Yes. All three parts deliver identical electrical performance across all specified parameters: voltage reference range, output current, tolerance, temperature coefficient, noise characteristics, and operating temperature range.

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