LM4120IM5-2.0 Equivalent & Substitute Parts

Part Overview

The LM4120IM5-2.0 is a Series Voltage Reference IC with fixed 2.048V output, ±0.5% tolerance, and 5 mA output current in SOT-23-5 surface mount packaging. This component is classified as Obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity. The part operates across a 2V to 12V input range with 275µA supply current and maintains performance across -40°C to 85°C operating temperature.

Key Parameters

Parameter	Value
Output Voltage (Fixed)	2.048V
Output Current	5 mA
Tolerance	±0.5%
Temperature Coefficient	50ppm/°C
Noise (0.1Hz to 10Hz)	20µVp-p
Noise (10Hz to 10kHz)	36µVp-p
Input Voltage Range	2V ~ 12V
Supply Current	275µA
Operating Temperature	-40°C ~ 85°C
Package	SOT-23-5 (SC-74A)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution for the LM4120IM5-2.0 is determined by strict alignment of electrical and mechanical parameters. The critical substitution criteria are:

Fixed output voltage of 2.048V
Output current capability of 5 mA
Tolerance specification of ±0.5%
Temperature coefficient of 50ppm/°C
Noise performance (0.1Hz to 10Hz: 20µVp-p; 10Hz to 10kHz: 36µVp-p)
SOT-23-5 package compatibility
Operating temperature range of -40°C to 85°C

Two substitute parts meet these criteria: LM4120IM5-2.0/NOPB and LM4125IM5-2.0/NOPB. Both are Texas Instruments Series Voltage Reference ICs with identical output specifications and packaging. The primary distinction lies in input voltage range and supply current specifications, which determine application suitability.

Parameter Comparison

Parameter	LM4120IM5-2.0	LM4120IM5-2.0/NOPB	LM4125IM5-2.0/NOPB
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Output Voltage	2.048V	2.048V	2.048V
Output Current	5 mA	5 mA	5 mA
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)	36µVp-p	36µVp-p	36µVp-p
Input Voltage Range	2V ~ 12V	2V ~ 12V	3.3V ~ 8V
Supply Current	275µA	275µA	290µA
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
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

Engineering Selection Recommendations

LM4120IM5-2.0/NOPB is the direct parametric equivalent to the obsolete LM4120IM5-2.0. Both parts maintain identical electrical specifications including input voltage range (2V ~ 12V) and supply current (275µA). The primary advantage of LM4120IM5-2.0/NOPB is its Last Time Buy status and ROHS3 compliance, providing regulatory alignment for new designs while maintaining full backward compatibility.

LM4125IM5-2.0/NOPB is a functional substitute with identical output voltage, current, tolerance, and noise specifications. The input voltage range is restricted to 3.3V ~ 8V, and supply current increases to 290µA. This part is suitable for applications where the narrower input voltage range and slightly higher supply current are acceptable. LM4125IM5-2.0/NOPB also carries ROHS3 compliance and Last Time Buy status.

For applications requiring the full 2V ~ 12V input range, LM4120IM5-2.0/NOPB is the appropriate selection. For applications operating within 3.3V ~ 8V input range, either substitute part is acceptable based on design requirements and supply chain availability.

Frequently Asked Questions (FAQ)

Q: Can LM4125IM5-2.0/NOPB replace LM4120IM5-2.0 in all applications?

A: LM4125IM5-2.0/NOPB is a functional substitute only for applications where the input voltage remains within 3.3V ~ 8V. The original LM4120IM5-2.0 supports 2V ~ 12V input range. If your design requires operation below 3.3V or above 8V input voltage, LM4120IM5-2.0/NOPB is required.

Q: What is the difference between LM4120IM5-2.0 and LM4120IM5-2.0/NOPB?

A: Both parts are electrically identical with matching output voltage (2.048V), tolerance (±0.5%), and all performance specifications. The primary differences are product status (Obsolete vs. Last Time Buy) and RoHS compliance (non-compliant vs. ROHS3 compliant). LM4120IM5-2.0/NOPB is the recommended replacement for new designs.

Q: Are all three parts pin-compatible?

A: Yes. LM4120IM5-2.0, LM4120IM5-2.0/NOPB, and LM4125IM5-2.0/NOPB all use SOT-23-5 packaging with identical pinout, enabling direct board-level substitution.

Q: What does the /NOPB suffix indicate?

A: The /NOPB suffix indicates the part is supplied without plumbum (lead-free), reflecting RoHS3 compliance and modern manufacturing standards.

Q: Which substitute part should I select for a new design?

A: LM4120IM5-2.0/NOPB is the direct equivalent and recommended choice for new designs. It maintains full electrical compatibility with the original part while providing ROHS3 compliance and Last Time Buy availability.

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