LM4140ACMX-4.1 Equivalent & Substitute Parts

Part Overview

The LM4140ACMX-4.1 is a Series Voltage Reference IC manufactured by Texas Instruments, designed to provide a fixed 4.096V output with ±0.1% tolerance. This component operates across a 1.8V to 5.5V input range and delivers up to 8 mA output current in an 8-SOIC surface mount package. The part is currently classified as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Substiute Parts

LM4140ACMX-4.1

Texas InstrumentsIn Stock: 2215LM4140ACMX-4.1 Datasheet

Current PartRFQ

LM4140ACMX-4.1/NOPB

Texas InstrumentsIn Stock: 1559LM4140ACMX-4.1/NOPB Datasheet

DirectRFQ

LTC1798CS8-4.1#PBF

Analog Devices Inc.In Stock: 1238LTC1798CS8-4.1#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM4140ACMX-4.1 are identified based on the following critical parameters that determine functional equivalence:

Primary Matching Criteria:

• Fixed output voltage of 4.096V
• 8-SOIC package form factor
• Surface mount mounting type
• Operating temperature range of 0°C ~ 70°C

Secondary Compatibility Parameters:

• Output current capability (minimum 8 mA required)
• Tolerance specification (±0.1% or better)
• Input voltage range compatibility
• Temperature coefficient stability

Two substitute parts meet these criteria with varying degrees of parameter alignment and product status differences.

Parameter Comparison

Engineering Selection Recommendations

LM4140ACMX-4.1/NOPB (Direct Successor)

This part is the recommended primary substitute. It maintains identical electrical specifications to the obsolete LM4140ACMX-4.1, including output voltage, current, tolerance, temperature coefficient, and input voltage range. The /NOPB suffix indicates lead-free, RoHS3-compliant manufacturing. Product status is Active, ensuring long-term availability and supply chain stability. This part provides drop-in compatibility with existing designs.

LTC1798CS8-4.1#PBF (Cross-Manufacturer Alternative)

This Analog Devices part shares the same 4.096V output voltage, 8-SOIC package, and operating temperature range. It provides higher output current (10 mA versus 8 mA) and significantly lower supply current (8.5 µA versus 400 µA). However, it exhibits relaxed tolerance (±0.15% versus ±0.1%), higher temperature coefficient (40 ppm/°C versus 3 ppm/°C), and higher noise levels (8 µVp-p versus 2.2 µVp-p). The input voltage range is narrower (4.296V ~ 12.6V versus 1.8V ~ 5.5V). This part is suitable for applications where the relaxed specifications are acceptable and lower quiescent current is beneficial. Product status is Active with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can LM4140ACMX-4.1/NOPB be used as a direct replacement for LM4140ACMX-4.1?

A: Yes. Both parts share identical electrical specifications, package form factor, and operating parameters. The primary difference is product status (Active versus Obsolete) and RoHS compliance level. The /NOPB variant is the current production equivalent.

Q: What are the key differences between LM4140ACMX-4.1 and LTC1798CS8-4.1#PBF?

A: Both provide 4.096V output in 8-SOIC packages. The LTC1798CS8-4.1#PBF offers higher output current (10 mA) and lower supply current (8.5 µA). However, it has relaxed tolerance (±0.15%), higher temperature coefficient (40 ppm/°C), higher noise (8 µVp-p), and a narrower input voltage range (4.296V ~ 12.6V). Selection depends on application requirements for accuracy and stability.

Q: Is the 8-SOIC package identical across all three parts?

A: Yes. All three parts use the 8-SOIC package with 0.154" width (3.90mm). Physical footprint and pin configuration are compatible for PCB layout purposes.

Q: Which substitute is recommended for new designs?

A: LM4140ACMX-4.1/NOPB is recommended for new designs requiring specifications matching the original LM4140ACMX-4.1. It is the active production part from the original manufacturer with full RoHS3 compliance.

Q: Can LTC1798CS8-4.1#PBF be used in applications requiring ±0.1% tolerance?

A: No. The LTC1798CS8-4.1#PBF is specified at ±0.15% tolerance, which exceeds the ±0.1% requirement of the original part. Applications with strict tolerance requirements must use LM4140ACMX-4.1/NOPB.

Q: What is the impact of the different input voltage ranges?

A: The LM4140ACMX-4.1 and LM4140ACMX-4.1/NOPB operate from 1.8V to 5.5V. The LTC1798CS8-4.1#PBF requires 4.296V minimum input. Designs with input voltages below 4.296V cannot use the LTC1798CS8-4.1#PBF variant.