Texas Instruments LM4040A10IDCKR

Overview

LM4040A10IDCKR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 10V output with ±0.1% initial accuracy (A-grade), 100ppm/°C temperature coefficient, 35μVRMS wideband noise, and stable operation from 45μA to 15mA cathode current. It serves as a high-stability voltage reference in analog-to-digital converters and sensor signal conditioning circuits.

For engineers reviewing the LM4040A10IDCKR datasheet, LM4040A10IDCKR pinout, LM4040A10IDCKR application, or LM4040A10IDCKR equivalent, key selection criteria include initial tolerance, thermal drift, low-noise performance, minimum operating current, and SC-70 package compatibility for space-constrained PCB layouts.

Technical Context

The LM4040A10IDCKR operates as a two-terminal shunt reference, sinking cathode current to maintain a precise 10V reverse breakdown voltage across its terminals. Its Zener-zap trimmed silicon design achieves tight initial tolerance without external components.

It features low dynamic impedance (≤0.8Ω at 1mA), stable performance with all capacitive loads (no output capacitor required), and guaranteed operation over –40°C to +85°C ambient temperature. Thermal hysteresis is limited to 0.08% after cycling between –40°C and +125°C.

Key Specifications

Pinout & Package

LM4040A10IDCKR is packaged in a 5-pin SC-70 (DCK) surface-mount package measuring 2.00mm × 1.25mm. Pin 1 is Anode (ground reference), Pin 3 is Cathode (voltage output), Pins 4 and 5 are No Connect (NC), and Pin 2 is the floating or anode-connected control terminal used for EMI mitigation in noisy environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3010AIDBZR and ADR3410ARJZ-R7, LM4040A10IDCKR offers true 2-terminal simplicity and lowest minimum operating current (45μA), making it optimal for passive, space-limited, or battery-powered shunt reference applications where supply rails are unavailable or costly to generate.

Availability

LM4040A10IDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, energy infrastructure monitoring, and analog input modules requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for LM4040A10IDCKR 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 company specializing in analog and embedded processing technologies, with leadership in precision analog ICs and industrial-grade components.

The LM4040 family is designed for high-accuracy, low-power voltage reference applications in industrial automation, test equipment, and sensor interfaces where stability, size, and reliability are critical.

FAQ

What is the maximum cathode current rating for LM4040A10IDCKR?

The absolute maximum cathode current for LM4040A10IDCKR is 25mA per TI's Absolute Maximum Ratings. However, the recommended operating range is 45μA to 15mA - exceeding 15mA risks thermal overload in the SC-70 package due to its 252°C/W junction-to-ambient thermal resistance, potentially degrading long-term stability or causing parametric shift.

Does LM4040A10IDCKR require an output capacitor for stability?

No, LM4040A10IDCKR is inherently stable with all capacitive loads and does not require an output capacitor. Its internal design ensures phase margin is maintained even when directly driving ADC input capacitors or op-amp feedback networks - a key advantage over many series references that mandate specific output capacitance for stability.

How does the Pin 2 (control terminal) function in LM4040A10IDCKR?

Pin 2 on LM4040A10IDCKR is a dedicated control terminal intended to reduce EMI susceptibility. It must either float or be tied directly to the anode (Pin 1). When placed near switching regulators or transformers, connecting Pin 2 to Pin 1 suppresses noise coupling into the reference junction, preventing output voltage perturbation without affecting regulation accuracy or thermal performance.

What is the long-term stability specification for LM4040A10IDCKR?

LM4040A10IDCKR exhibits 120ppm long-term stability after 1000 hours of operation at 25°C with 100μA cathode current. This value reflects typical parametric drift under accelerated life testing and supports recalibration intervals of ≥2 years in deployed instrumentation where annual drift must remain below 60ppm for metrology-grade performance.

Can LM4040A10IDCKR operate across the full –40°C to +125°C range?

No - LM4040A10IDCKR (suffix "I") is characterized for operation from –40°C to +85°C only. The "Q" grade (e.g., LM4040A10IQ) is required for extended temperature operation up to +125°C. Using the "I" variant beyond +85°C may result in increased temperature coefficient deviation and potential violation of the 100ppm/°C spec, especially near the upper limit.