LM4140BCM-4.1 Equivalent & Substitute Parts

Part Overview

The LM4140BCM-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 is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The part operates across a 1.8V to 5.5V input range with 8mA output current capability and is packaged in an 8-SOIC surface mount configuration.

Substiute Parts

LM4140BCM-4.1

Texas InstrumentsIn Stock: 1223LM4140BCM-4.1 Datasheet

Current PartRFQ

LM4140BCM-4.1/NOPB

Texas InstrumentsIn Stock: 1422LM4140BCM-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 LM4140BCM-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 configuration with 0.154" width (3.90mm)
• Surface mount mounting type
• Operating temperature range of 0°C to 70°C
• Series voltage reference topology

Secondary Compatibility Parameters:

• Output current capability (minimum 8mA required)
• Tolerance specification (±0.1% preferred, ±0.15% acceptable with design verification)
• Temperature coefficient performance
• Input voltage range compatibility (minimum 1.8V to 5.5V support)

The substitute parts listed maintain the same output voltage, package footprint, and basic operational characteristics, ensuring direct replacement capability in existing PCB designs.

Parameter Comparison

Engineering Selection Recommendations

LM4140BCM-4.1/NOPB (Direct Equivalent)

This part is the recommended primary substitute. It is manufactured by Texas Instruments and maintains identical electrical specifications to the obsolete LM4140BCM-4.1, including output voltage, current rating, tolerance, and temperature coefficient. The primary distinction is product status: LM4140BCM-4.1/NOPB is active and carries ROHS3 compliance certification, whereas the original part is obsolete and RoHS non-compliant. The packaging format differs only in designation (Tube vs. unspecified), with no impact on component functionality. This part provides direct pin-for-pin and functional replacement with improved regulatory compliance.

LTC1798CS8-4.1#PBF (Functional Substitute)

This Analog Devices part maintains the same 4.096V fixed output voltage and 8-SOIC package configuration. However, it introduces measurable differences in secondary parameters: tolerance is ±0.15% (versus ±0.1%), temperature coefficient is 40ppm/°C (versus 6ppm/°C), and input voltage range is 4.296V to 12.6V (versus 1.8V to 5.5V). The LTC1798CS8-4.1#PBF offers higher output current (10mA) and significantly lower supply current (8.5µA). This part is suitable for applications where the wider input voltage range and lower supply current provide system-level advantages, provided the relaxed tolerance and higher temperature coefficient are acceptable for the specific circuit design.

Frequently Asked Questions (FAQ)

Q: Can LM4140BCM-4.1/NOPB be used as a direct replacement for LM4140BCM-4.1?

A: Yes. The LM4140BCM-4.1/NOPB is electrically and mechanically identical to the obsolete LM4140BCM-4.1. Both parts deliver 4.096V fixed output with ±0.1% tolerance, 8mA output current, and 6ppm/°C temperature coefficient. The primary difference is product status and regulatory compliance. No circuit modifications are required.

Q: What are the key differences between LM4140BCM-4.1/NOPB and LTC1798CS8-4.1#PBF?

A: Both parts provide 4.096V output in 8-SOIC packages. The LM4140BCM-4.1/NOPB maintains ±0.1% tolerance and 6ppm/°C temperature coefficient with a 1.8V to 5.5V input range. The LTC1798CS8-4.1#PBF has ±0.15% tolerance, 40ppm/°C temperature coefficient, and requires 4.296V to 12.6V input. The LTC1798 offers higher output current (10mA vs. 8mA) and lower supply current (8.5µA vs. 400µA).

Q: Is the LTC1798CS8-4.1#PBF compatible with designs requiring 1.8V input supply?

A: No. The LTC1798CS8-4.1#PBF requires a minimum input voltage of 4.296V. Designs operating with 1.8V to 5.5V input supplies must use LM4140BCM-4.1/NOPB or the original LM4140BCM-4.1.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both LM4140BCM-4.1/NOPB and LTC1798CS8-4.1#PBF carry ROHS3 compliance certification. The original LM4140BCM-4.1 is RoHS non-compliant.

Q: Will the 8-SOIC package footprint be identical across all three parts?

A: Yes. All three parts use 8-SOIC packaging with 0.154" width (3.90mm). PCB footprints are mechanically compatible without modification.

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

A: For new designs requiring the lowest tolerance and temperature coefficient performance with flexible input voltage requirements, LM4140BCM-4.1/NOPB is the preferred choice. For applications benefiting from lower supply current and higher output current capability, LTC1798CS8-4.1#PBF is suitable if the higher input voltage minimum and relaxed tolerance specifications are acceptable.