Texas Instruments LM4040A50IDCKRG4

Overview

LM4040A50IDCKRG4 from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 5.0 V output with ±0.1% initial accuracy (A-grade), 100 ppm/°C temperature coefficient, 35 μV_RMS wideband noise, and stable operation from 45 μA to 15 mA cathode current. It serves as a low-drift, low-noise voltage基准 in high-resolution ADC/DAC biasing, sensor excitation, and portable instrumentation.

For engineers reviewing the LM4040A50IDCKRG4 datasheet, LM4040A50IDCKRG4 pinout, LM4040A50IDCKRG4 application, or LM4040A50IDCKRG4 equivalent, key selection criteria include guaranteed 5.0 V output tolerance over –40°C to 85°C, SC-70-5 package compatibility, no-output-capacitor stability, and verified long-term drift of ≤120 ppm after 1000 hours.

Technical Context

The LM4040A50IDCKRG4 uses Zener-zap trimming during wafer sort to achieve 0.1% initial accuracy at 25°C and maintains tight thermal stability via low-tempco Zener architecture. Its two-terminal shunt topology requires only an external series resistor for biasing and operates without output capacitance across all load conditions.

Designed for industrial ambient temperatures (–40°C to 85°C), it features low dynamic impedance (≤0.8 Ω at 1 mA), thermal hysteresis of 0.08%, and ESD robustness (±2000 V HBM). The device's cathode-anode configuration enables direct integration into feedback loops of precision regulators and analog front-ends.

Key Specifications

Pinout & Package

LM4040A50IDCKRG4 is packaged in a 5-pin SC-70 (DCK) package measuring 2.00 mm × 1.25 mm. Pin 1 = Anode (ground reference), Pin 2 = Cathode (output/reference node), Pin 3 = NC (no internal connection), Pins 4–5 = NC.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040B50IDCKR, the LM4040A50IDCKRG4 delivers half the initial error (±5 mV vs. ±10 mV) at identical temperature stability and package footprint; versus REF3050AIDBZR, it offers simpler 2-pin biasing and zero-supply dependency but trades 50 ppm/°C for 100 ppm/°C tempco.

Availability

LM4040A50IDCKRG4 is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and field transmitter designs requiring stable component supply with guaranteed long-term calibration integrity.

Supply support for LM4040A50IDCKRG4 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, embedded processing, and connectivity technologies with over 90 years of innovation in precision analog ICs.

The LM4040 family was engineered for cost-sensitive, space-constrained applications demanding high initial accuracy and low drift - particularly in portable instrumentation, industrial sensors, and automotive subsystems.

FAQ

What is the maximum cathode current rating for LM4040A50IDCKRG4?

The LM4040A50IDCKRG4 has an absolute maximum cathode current rating of 25 mA, though its recommended operating range is 45 μA to 15 mA. Exceeding 15 mA may increase self-heating and degrade long-term stability; operation above 25 mA risks permanent damage per TI's Absolute Maximum Ratings table.

Does LM4040A50IDCKRG4 require an output capacitor for stability?

No, the LM4040A50IDCKRG4 is inherently stable with all capacitive loads and does not require an external output capacitor. This is confirmed in TI's datasheet Section 1 Features and Section 3 Description, which explicitly state "stable with all capacitive loads; no output capacitor required" - simplifying layout in compact PCBs.

What is the thermal hysteresis specification for LM4040A50IDCKRG4?

The LM4040A50IDCKRG4 exhibits 0.08% thermal hysteresis, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This value is consistent across all LM4040 grades and is documented in Tables 6.5–6.22 of the TI datasheet under the VHYST parameter.

Can LM4040A50IDCKRG4 operate in extended temperature environments up to 125°C?

No - the LM4040A50IDCKRG4 is rated for the industrial temperature range of –40°C to 85°C only. For operation up to 125°C, TI offers the LM4040C50Q or LM4040D50Q variants (Q-grade), which are characterized across –40°C to 125°C but with looser initial accuracy (0.5% or 1.0%).

How does the LM4040A50IDCKRG4 compare to the LM4040A50IDBZR in terms of package and performance?

The LM4040A50IDCKRG4 uses a 5-pin SC-70 (DCK) package, while LM4040A50IDBZR uses a 3-pin SOT-23 (DBZ) package. Both share identical electrical specs (5.0 V, 0.1%, 100 ppm/°C), but DCK offers better thermal resistance (252°C/W vs. 206°C/W) and includes two NC pins for enhanced layout flexibility and grounding options.