Texas Instruments TL4050C41QDBZR

Overview

TL4050C41QDBZR from Texas Instruments is a precision micropower shunt voltage reference with a fixed 4.096V output, ±21mV (±0.5%) initial tolerance at 25°C, 50ppm/°C max temperature coefficient, 93μVRMS typical wideband noise, and operation across –40°C to 125°C. It serves as a stable reference in high-resolution ADC/DAC circuits, battery-powered instrumentation, and automotive power-supply monitors where low drift and minimal quiescent current are critical.

For engineers reviewing the TL4050C41QDBZR datasheet, TL4050C41QDBZR pinout, TL4050C41QDBZR application, or TL4050C41QDBZR equivalent, this page delivers verified specifications, SOT-23-3 terminal mapping, real-world use cases in 12-bit data acquisition and extended-temperature industrial sensing, and two validated alternative parts with documented parametric differences.

Technical Context

The TL4050C41QDBZR operates as a two-terminal shunt reference requiring no external capacitor for stability and supporting all capacitive loads. Its internal bandgap core delivers 4.096V with thermal hysteresis of 1.148mV over –40°C to 125°C cycling and long-term stability of 120ppm after 1000 hours.

It maintains low dynamic impedance (0.5Ω at 1mA, 120Hz) and tight cathode current regulation - minimum operating current is 52μA (typical), maximum rated cathode current is 15mA, and reverse breakdown voltage change remains ≤10mV across 1mA–15mA I_Z.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with gull-wing leads, 1.45mm × 2.9mm footprint, and 1.1mm height - optimized for space-constrained PCB layouts and automated assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3040AIDBZR and LM4040C41IDBZR, TL4050C41QDBZR provides identical 4.096V output and SOT-23-3 compatibility with tighter thermal performance (50ppm/°C vs. 100ppm/°C) and lower minimum bias (52μA vs. 85μA), making it optimal for extended-temperature, battery-constrained designs without layout changes.

Availability

TL4050C41QDBZR is available at Aetrix Electronics and suitable for data-acquisition systems, automotive power-supply monitors, and industrial process controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050C41QDBZR 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 ICs, embedded processors, and connectivity solutions for industrial, automotive, and consumer markets.

The TL4050 series was designed as a precision micropower shunt reference targeting high-resolution data converters, portable instrumentation, and automotive subsystems needing guaranteed operation from –40°C to 125°C.

FAQ

What is the operating temperature range of TL4050C41QDBZR?

The TL4050C41QDBZR is characterized for operation from –40°C to +125°C ambient temperature, qualifying it for under-hood automotive, industrial control, and outdoor equipment applications where extended thermal performance is mandatory. This range is confirmed in Section 5.7 of the official TI datasheet (SLOS486B) and distinguishes it from industrial-grade variants limited to 85°C.

Does TL4050C41QDBZR require an output capacitor?

No, TL4050C41QDBZR does not require an output capacitor for stability - it is explicitly designed to remain stable with all capacitive loads, including direct connection to ADC reference inputs or large bulk capacitance. This eliminates BOM cost and layout complexity while maintaining regulation integrity across load transients.

What is the minimum cathode current needed for TL4050C41QDBZR to regulate properly?

The TL4050C41QDBZR requires a minimum cathode current of 52μA (typical) and 78μA (max over temperature) to maintain regulation within specification. Below this threshold, output voltage deviates beyond the ±0.5% initial tolerance, making it critical to size the series bias resistor (R_S) to ensure sufficient current even at lowest input voltage and highest load current.

How does the noise performance of TL4050C41QDBZR impact 12-bit ADC accuracy?

With 93μVRMS wideband noise (10Hz–10kHz), TL4050C41QDBZR contributes <0.1 LSB of RMS noise to a 4.096V-referenced 12-bit ADC (1mV/LSB), preserving effective number of bits (ENOB) without requiring external filtering. This enables direct interface to precision SAR ADCs like ADS7842 without degrading SNR or introducing calibration overhead.

Is TL4050C41QDBZR pin-compatible with other TL4050 variants?

Yes, TL4050C41QDBZR uses the SOT-23-3 (DBZ) package and shares identical pinout (Anode–Cathode–NC) with all TL4050x41Q and TL4050x41I variants in the same package - enabling direct substitution within the 4.096V family when grade (A/B/C) or temperature range (I/Q) changes are acceptable per design requirements.