LM4140ACM-4.1 Equivalent & Substitute Parts

Part Overview

The LM4140ACM-4.1 is a Series Voltage Reference IC manufactured by Texas Instruments, delivering a fixed 4.096V output with ±0.1% tolerance. This component is classified as Power Management (PMIC) and is housed in an 8-SOIC package. The part is currently listed as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. Equivalent parts must maintain the same output voltage, tolerance specifications, and package form factor to ensure direct compatibility in existing circuit designs.

Substiute Parts

LM4140ACM-4.1

Texas InstrumentsIn Stock: 2251LM4140ACM-4.1 Datasheet

Current PartRFQ

LM4140ACM-4.1/NOPB

Texas InstrumentsIn Stock: 1416LM4140ACM-4.1/NOPB Datasheet

DirectRFQ

LTC1798CS8-4.1#PBF

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

MFR RecommendedRFQ

LTC1798CS8-4.1#TRPBF

Analog Devices Inc.In Stock: 863LTC1798CS8-4.1#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute components for the LM4140ACM-4.1 are evaluated based on the following critical parameters that determine functional compatibility:

Primary Substitution Criteria:

• Fixed output voltage of 4.096V
• 8-SOIC package form factor (0.154", 3.90mm Width)
• Surface mount mounting type
• Operating temperature range of 0°C ~ 70°C

Secondary Compatibility Factors:

• Output current capability (minimum 8 mA required)
• Input voltage range compatibility
• Tolerance and temperature coefficient specifications
• Product status and compliance certifications

The LM4140ACM-4.1/NOPB represents a direct equivalent from Texas Instruments with identical electrical specifications and active product status. The LTC1798CS8-4.1#PBF and LTC1798CS8-4.1#TRPBF are manufacturer-recommended alternatives from Analog Devices Inc., offering the same 4.096V fixed output and 8-SOIC package, though with different tolerance and temperature coefficient characteristics.

Parameter Comparison

Engineering Selection Recommendations

LM4140ACM-4.1/NOPB (Direct Equivalent)

This part is the recommended primary substitute. It maintains identical electrical specifications to the original LM4140ACM-4.1, including ±0.1% tolerance, 3ppm/°C temperature coefficient, and 1.8V ~ 5.5V input voltage range. The part is in active production status and ROHS3 compliant, providing long-term availability and regulatory compliance advantages over the obsolete original part. The only difference is packaging format (Tube vs. unspecified original packaging).

LTC1798CS8-4.1#PBF and LTC1798CS8-4.1#TRPBF (Manufacturer-Recommended Alternatives)

These Analog Devices components provide functional substitution with the same 4.096V fixed output and 8-SOIC package. Both parts are in active production and ROHS3 compliant. However, they exhibit different electrical characteristics: ±0.15% tolerance (versus ±0.1%), 40ppm/°C temperature coefficient (versus 3ppm/°C), and higher noise levels (8µVp-p versus 2.2µVp-p). The input voltage range is also different (4.296V ~ 12.6V versus 1.8V ~ 5.5V). These parts are suitable for applications where the relaxed tolerance and temperature coefficient specifications are acceptable. The LTC1798CS8-4.1#TRPBF variant is supplied in Tape & Reel format, while the LTC1798CS8-4.1#PBF is supplied in Tube format.

Frequently Asked Questions (FAQ)

Q: Can the LM4140ACM-4.1/NOPB be used as a direct replacement for the LM4140ACM-4.1?

A: Yes. The LM4140ACM-4.1/NOPB is a direct equivalent with identical electrical specifications. The primary difference is packaging format and product status (active versus obsolete). No circuit modifications are required.

Q: What are the key differences between the Texas Instruments LM4140 and Analog Devices LTC1798 alternatives?

A: The LTC1798 variants maintain the same 4.096V output voltage and 8-SOIC package, but differ in tolerance (±0.15% vs. ±0.1%), temperature coefficient (40ppm/°C vs. 3ppm/°C), noise performance (8µVp-p vs. 2.2µVp-p), and input voltage range (4.296V ~ 12.6V vs. 1.8V ~ 5.5V). Selection depends on application requirements for accuracy and stability.

Q: Are the LTC1798CS8-4.1#PBF and LTC1798CS8-4.1#TRPBF electrically identical?

A: Yes, both parts are electrically identical. The difference is packaging format: Tube versus Tape & Reel (TR). Selection depends on assembly process requirements and quantity needs.

Q: What is the impact of the different input voltage ranges between the LM4140 and LTC1798?

A: The LM4140ACM-4.1 accepts input voltages from 1.8V to 5.5V, while the LTC1798 requires 4.296V to 12.6V. If your circuit uses input voltages below 4.296V, the LTC1798 is not suitable. Verify your power supply specifications before substitution.

Q: Are all substitute parts RoHS compliant?

A: The LM4140ACM-4.1 is RoHS non-compliant. The LM4140ACM-4.1/NOPB and both LTC1798 variants are ROHS3 compliant. If RoHS compliance is required for your application, use the compliant alternatives.

Q: Can I use the LTC1798 if my application requires ±0.1% tolerance?

A: No. The LTC1798 variants specify ±0.15% tolerance, which exceeds the ±0.1% requirement of the original LM4140ACM-4.1. Use the LM4140ACM-4.1/NOPB for applications requiring ±0.1% accuracy.