LM4140BCMX-2.5 Equivalent & Substitute Parts

Part Overview

The LM4140BCMX-2.5 is a Series Voltage Reference IC manufactured by Texas Instruments, designed to provide a fixed 2.5V output with ±0.1% tolerance. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part is housed in an 8-SOIC surface mount package and operates across an input voltage range of 1.8V to 5.5V with a maximum output current of 8 mA.

Substiute Parts

LM4140BCMX-2.5

Texas InstrumentsIn Stock: 701LM4140BCMX-2.5 Datasheet

Current PartRFQ

LM4140BCMX-2.5/NOPB

Texas InstrumentsIn Stock: 4070LM4140BCMX-2.5/NOPB Datasheet

DirectRFQ

LTC1798CS8-2.5#PBF

Analog Devices Inc.In Stock: 1938LTC1798CS8-2.5#PBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM4140BCMX-2.5 is determined by the following critical parameters:

• Fixed output voltage of 2.5V
• 8-SOIC package form factor with identical physical dimensions
• Surface mount mounting type
• Operating temperature range of 0°C to 70°C
• Input voltage compatibility within 1.8V to 5.5V range
• Output current capability of 8 mA or greater
• Output tolerance of ±0.1% or better
• Series voltage reference topology

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

Parameter Comparison

Engineering Selection Recommendations

The LM4140BCMX-2.5/NOPB is the direct equivalent substitute. It is manufactured by Texas Instruments with identical electrical specifications and package configuration. The primary distinction is product status: the substitute is active while the original is obsolete. The LM4140BCMX-2.5/NOPB carries ROHS3 compliance, whereas the original part is RoHS non-compliant. This part is available in Tape & Reel packaging with 4006 units in stock.

The LTC1798CS8-2.5#PBF from Analog Devices Inc. is a functional alternative that maintains the 2.5V fixed output and 8-SOIC package. This part is active and ROHS3 compliant. However, it exhibits differences in output tolerance (±0.15% versus ±0.1%), temperature coefficient (40ppm/°C versus 6ppm/°C), noise performance (8µVp-p versus 2.2µVp-p), and input voltage range (2.7V to 12.6V versus 1.8V to 5.5V). The LTC1798CS8-2.5#PBF offers higher output current (10 mA) and significantly lower supply current (8.5µA). This part is supplied in Tube packaging with 1900 units in stock.

Frequently Asked Questions (FAQ)

Q: Can the LM4140BCMX-2.5/NOPB be used as a direct replacement for the LM4140BCMX-2.5?

A: Yes. The LM4140BCMX-2.5/NOPB is electrically and mechanically identical to the original part. The primary differences are product status (active versus obsolete) and RoHS compliance level. Both parts share identical output voltage, tolerance, current ratings, temperature coefficient, and noise specifications.

Q: What are the limitations of using the LTC1798CS8-2.5#PBF as a substitute?

A: The LTC1798CS8-2.5#PBF differs in four key parameters: output tolerance is ±0.15% instead of ±0.1%, temperature coefficient is 40ppm/°C instead of 6ppm/°C, noise is 8µVp-p instead of 2.2µVp-p, and the input voltage range is 2.7V to 12.6V instead of 1.8V to 5.5V. Applications requiring the tighter tolerance, lower temperature coefficient, or lower noise performance of the original part may not be suitable for this substitute.

Q: Are all substitute parts compatible with the same PCB layout?

A: Yes. Both substitute parts use the 8-SOIC package with identical physical dimensions (0.154" width, 3.90mm). PCB footprints and land patterns are compatible without modification.

Q: What is the difference between the LM4140BCMX-2.5 and LM4140BCMX-2.5/NOPB packaging?

A: The original part is supplied in standard packaging, while the LM4140BCMX-2.5/NOPB is supplied in Tape & Reel (TR) format. Both contain the same die and electrical specifications. The packaging difference affects handling, storage, and automated assembly processes.

Q: Which substitute part should be selected for new designs?

A: For direct replacement with identical electrical performance, select the LM4140BCMX-2.5/NOPB. For applications where lower supply current is beneficial and the specified tolerance and noise parameters are acceptable, the LTC1798CS8-2.5#PBF is a viable alternative. Verify input voltage range compatibility with your application before selection.