Texas Instruments TL4050C41IDBZR

Overview

TL4050C41IDBZR from Texas Instruments is a precision micropower shunt voltage reference with 4.096 V nominal output, ±21 mV (±0.5%) initial tolerance at 25°C, 50 ppm/°C max temperature coefficient, 93 μV_RMS wideband noise (10 Hz–10 kHz), and stable operation from 52 μA to 15 mA cathode current. It serves as a low-drift, low-noise reference in 12-bit data-acquisition systems requiring LSB = 1 mV.

For engineers reviewing the TL4050C41IDBZR datasheet, TL4050C41IDBZR pinout, TL4050C41IDBZR application, or TL4050C41IDBZR equivalent, key selection criteria include industrial-temperature operation (–40°C to 85°C), SOT-23-3 package compatibility, no-output-capacitor stability, and direct use with ADCs like ADS7842 in battery-powered instrumentation.

Technical Context

The TL4050C41IDBZR operates as a two-terminal shunt reference: cathode sinks current while anode connects to ground or low-impedance return path. Its bandgap-derived core delivers fixed 4.096 V reverse breakdown voltage with minimal dynamic impedance (0.5 Ω at 1 mA, 120 Hz) and thermal hysteresis of 1.148 mV over –40°C to 125°C cycling.

It requires no external capacitor for stability and maintains regulation across full capacitive loads. The C-grade variant trades tighter initial accuracy for cost-sensitive applications where long-term drift (120 ppm after 1000 h) and wide operating current range (52–15,000 μA) are prioritized over A/B-grade precision.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with gull-wing leads; compact 2.92 mm × 1.3 mm footprint and 1.02 mm height suitable for space-constrained PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050B41IDBZR, TL4050C41IDBZR reduces cost by relaxing initial tolerance while retaining identical temperature behavior, noise, and package - ideal for calibrated systems. REF3040AIDBZR offers series architecture benefits but demands layout changes and sacrifices noise performance.

Availability

TL4050C41IDBZR is available at Aetrix Electronics and suitable for data-acquisition systems, power-supply monitors, and battery-powered instrumentation requiring stable component supply across industrial temperature ranges.

Supply support for TL4050C41IDBZR 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TL4050 series targets cost-sensitive, space-constrained applications needing precision shunt references - designed specifically for 12-bit ADC interfacing, portable instrumentation, and industrial monitoring where micropower operation and capacitor-free stability are critical.

FAQ

What is the output voltage tolerance of TL4050C41IDBZR at 25°C?

The TL4050C41IDBZR has a reverse breakdown voltage tolerance of ±21 mV (±0.5%) at 25°C and I_Z = 100 μA. This specification is confirmed in Section 5.6 of the official TI datasheet (SLOS486B), which lists TL4050C41I electrical characteristics. The value reflects the maximum deviation from the nominal 4.096 V output under standard test conditions.

Does TL4050C41IDBZR require an external output capacitor?

No, TL4050C41IDBZR does not require an external output capacitor for stability. As stated in Section 8.1 of the TI datasheet, it is designed to remain stable with all capacitive loads - including ADC input capacitance - eliminating the need for bypass components. This simplifies layout and reduces BOM count in space-constrained designs.

What is the minimum cathode current needed for TL4050C41IDBZR to regulate properly?

The TL4050C41IDBZR requires a minimum cathode current of 52 μA (typical) at 25°C to maintain regulation, as specified in Table 5.6 of the TI datasheet. At full temperature range (–40°C to 85°C), the guaranteed minimum increases to 73 μA. This defines the lower bound for RS resistor sizing in shunt regulator configurations.

How does TL4050C41IDBZR achieve 1 mV LSB compatibility with 12-bit ADCs?

TL4050C41IDBZR's precise 4.096 V output directly maps to 4096 quantization steps in a 12-bit system powered from a 5 V supply, yielding exactly 1 mV per LSB. This eliminates scaling errors and simplifies firmware implementation - a design intent explicitly cited in Section 8.3 of the TI datasheet for applications like the ADS7842.

What is the thermal hysteresis specification for TL4050C41IDBZR?

The thermal hysteresis of TL4050C41IDBZR is 1.148 mV, defined as the difference between V_Z measured at 25°C after cycling to –40°C versus after cycling to 125°C. This parameter is documented in Section 5.6 of the TI datasheet and impacts repeatability in systems undergoing repeated thermal cycles.