Texas Instruments LM4041C12ILP

Overview

LM4041C12ILP from Texas Instruments is a precision micropower shunt voltage reference with a fixed 1.225 V output, ±0.5% initial tolerance (C grade), 100 ppm/°C max temperature coefficient, 20 μV_RMS wideband noise, and stable operation from 45 μA to 12 mA cathode current. It serves as a low-drift, low-noise voltage reference in high-accuracy analog signal chains for industrial data acquisition systems.

For engineers reviewing the LM4041C12ILP datasheet, LM4041C12ILP pinout, LM4041C12ILP application, or LM4041C12ILP equivalent, key selection criteria include guaranteed 1.225 V output accuracy over –40°C to +85°C, no-output-capacitor stability, SC-70-5 package compatibility, and verified performance under capacitive load conditions up to 1 μF.

Technical Context

The LM4041C12ILP implements a Zener-based shunt reference architecture trimmed via Zener-zap during wafer sort to achieve ±0.5% output tolerance at 25°C and ≤100 ppm/°C drift across –40°C to +85°C. Its dynamic impedance remains ≤1.5 Ω at 1 mA, enabling tight regulation under varying load currents.

Unlike series references, it operates without an input supply rail - instead sinking cathode current to maintain a precise 1.225 V between cathode and anode terminals. It requires no external capacitor for stability and maintains low noise (20 μV_RMS, 10 Hz–10 kHz) even with full capacitive loading.

Key Specifications

Pinout & Package

LM4041C12ILP is packaged in a 5-pin SC-70 (DCK) surface-mount package with exposed pad for thermal enhancement. Pin 1 = FB (feedback), Pin 2 = NC, Pin 3 = Cathode, Pin 4 = NC, Pin 5 = Anode.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar shunt voltage reference applications.

Compared with TL431CDBZR and REF3012AIDBZR, the LM4041C12ILP uniquely delivers 1.225 V fixed output with micropower operation (45 μA), no-input-rail simplicity, and SC-70-5 compactness - making it optimal for space- and energy-constrained 1.2 V reference applications where absolute minimum component count is critical.

Availability

LM4041C12ILP is available at Aetrix Electronics and suitable for industrial data acquisition, power-supply monitoring, and battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for LM4041C12ILP includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision reference design and high-reliability manufacturing.

The LM4041 product line was engineered for cost-sensitive, space-constrained applications demanding high initial accuracy, low drift, and zero-output-capacitor operation - especially in portable instrumentation, process control, and energy metering.

FAQ

What is the output voltage tolerance of the LM4041C12ILP at room temperature?

The LM4041C12ILP has a maximum initial output voltage tolerance of ±0.5% at 25°C, corresponding to ±6.125 mV around the nominal 1.225 V output. This C-grade specification is verified across production lots and is documented in Section 5.5 of the LM4041 datasheet (SLCS146H). The LM4041C12ILP maintains this tolerance without calibration or trimming.

Does the LM4041C12ILP require an external output capacitor for stability?

No, the LM4041C12ILP does not require an external output capacitor for stability. Its internal design ensures unconditional stability with capacitive loads ranging from 0 to at least 1 μF, as confirmed in Section 7.1 and Figure 5-7 of the LM4041 datasheet. This eliminates capacitor-related drift, leakage, and board space - a key advantage over many competing shunt references. The LM4041C12ILP remains stable even with no capacitor installed.

What is the operating temperature range for the LM4041C12ILP?

The LM4041C12ILP is characterized for operation across an ambient temperature range of –40°C to +85°C (industrial grade). This range is explicitly defined in Section 3 (Description) and Table 5.5 of the LM4041 datasheet. Performance parameters including output voltage drift (≤100 ppm/°C), minimum cathode current (80 μA max over full range), and dynamic impedance are guaranteed within this interval.

Which package type is used by the LM4041C12ILP?

The LM4041C12ILP uses the 5-pin SC-70 (DCK) package, as indicated by the "LP" suffix in the orderable part number convention and confirmed in TI's Packaging Information addendum. Pin configuration follows Figure 4-2 and Table "Pin Functions" for the DCK variant: Pin 1 = FB (NC for fixed version), Pins 2 & 4 = NC, Pin 3 = Cathode, Pin 5 = Anode. This package measures 2.0 mm × 1.25 mm with 0.65 mm pitch.

How does the LM4041C12ILP differ from the adjustable LM4041 variants?

The LM4041C12ILP is a fixed-output variant with 1.225 V nominal voltage and no functional FB pin - unlike adjustable versions (e.g., LM4041CIZ) which require external resistors and use Pin 1 as an active feedback input. The LM4041C12ILP's FB pin is internally unused and must be left floating. Its electrical specs - including tighter cathode current range definition and absence of ΔVREF/ΔVKA parameter - reflect its fixed-voltage optimization, simplifying design and validation.