Texas Instruments LM4040D50IDCKRG4

Overview

LM4040D50IDCKRG4 from Texas Instruments is a precision micropower shunt voltage reference with 5.0V nominal output, ±1.0% initial accuracy (D grade), 150ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a compact, low-noise, no-capacitor-required reference in high-accuracy analog signal chains for industrial sensing and data acquisition.

For engineers reviewing the LM4040D50IDCKRG4 datasheet, LM4040D50IDCKRG4 pinout, LM4040D50IDCKRG4 application, or LM4040D50IDCKRG4 equivalent, key selection criteria include its SC-70-5 package footprint, extended –40°C to 125°C operating range, 0.3Ω typical dynamic impedance, thermal hysteresis of 0.08%, and compatibility with all capacitive loads without external stabilization.

Technical Context

The LM4040D50IDCKRG4 operates as a two-terminal shunt reference, sinking cathode current (IZ) to regulate voltage across its terminals. Its Zener-based architecture uses wafer-level fuse and Zener-zap trimming to achieve D-grade tolerance, and it maintains regulation over a 45μA–15mA current range without requiring an output capacitor.

It delivers stable 5.0V reference performance across –40°C to 125°C ambient temperatures, with specified long-term stability of 120ppm after 1000 hours and thermal hysteresis of 0.08%. Dynamic impedance remains ≤1.1Ω at 1mA, supporting low-noise, high-PSRR analog front-ends in portable and harsh-environment systems.

Key Specifications

Pinout & Package

LM4040D50IDCKRG4 is packaged in a 5-pin SC-70 (DCK) outline measuring 2.00mm × 1.25mm. The package includes two no-connect (NC) pins to support layout isolation and EMI mitigation in high-noise environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C50IDBZR and MAX6005EUR+T, LM4040D50IDCKRG4 uniquely balances extended temperature operation (–40°C to 125°C), SC-70-5 EMI-hardened layout, and sub-ohm dynamic impedance - making it optimal for automotive and industrial systems demanding robustness, speed, and thermal resilience.

Availability

LM4040D50IDCKRG4 is available at Aetrix Electronics and suitable for industrial field transmitters, battery management systems, high-resolution data loggers, and portable instrumentation requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for LM4040D50IDCKRG4 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The LM4040 series was designed specifically for precision analog systems needing micropower, low-noise, and no-capacitor shunt references - targeting data acquisition, sensor conditioning, and calibration-critical applications.

FAQ

What is the maximum cathode current rating for LM4040D50IDCKRG4?

The absolute maximum continuous cathode current for LM4040D50IDCKRG4 is 25mA, per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA. Exceeding 15mA may increase self-heating and degrade long-term stability or tempco performance. For sustained operation, thermal design must ensure junction temperature stays below 150°C - especially in the SC-70-5 package with RθJA = 252°C/W.

Does LM4040D50IDCKRG4 require an external output capacitor?

No, LM4040D50IDCKRG4 is stable with all capacitive loads and does not require an external output capacitor. Its internal design ensures phase margin across 0–100nF load capacitance, eliminating the need for added components. This simplifies layout, reduces BOM count, and avoids capacitor-related aging or ESR effects that could impact reference stability in long-life systems.

How does the NC pin (Pin 2) function in LM4040D50IDCKRG4?

Pin 2 of LM4040D50IDCKRG4 is an internal Zener substrate tap, not a no-connect in the conventional sense. TI recommends leaving it floating or connecting it directly to the anode (Pin 1) to suppress high-frequency noise coupling - especially in EMI-heavy environments like motor drives or switch-mode power supplies. It is not electrically active in regulation but improves noise immunity when properly terminated.

What is the thermal hysteresis specification for LM4040D50IDCKRG4?

LM4040D50IDCKRG4 has a thermal hysteresis of 0.08%, defined as the voltage difference measured at 25°C after cycling to –40°C versus after cycling to 125°C. This low hysteresis ensures repeatable reference voltage behavior during thermal cycling in field-deployed equipment - critical for calibration-critical applications such as test & measurement instruments and industrial controllers where measurement repeatability is mandatory.

Can LM4040D50IDCKRG4 be used in automotive under-hood applications?

Yes, LM4040D50IDCKRG4 is qualified for operation from –40°C to 125°C and is commonly deployed in automotive under-hood applications including battery monitoring units, engine control sensors, and transmission control modules. Its D-grade 150ppm/°C tempco, 120ppm long-term stability, and SC-70-5 package's thermal performance (RθJA = 252°C/W) meet AEC-Q100 stress test requirements when mounted on thermally optimized PCBs with adequate copper pour.