Texas Instruments TL4050A10QDBZR

Overview

TL4050A10QDBZR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 10V output with ±0.1% initial tolerance and ±50ppm/°C temperature coefficient across –40°C to 125°C. It operates from 60μA to 15mA cathode current, exhibits 150μVRMS wideband noise, and maintains stability with all capacitive loads-ideal for high-accuracy ADC/DAC biasing in automotive and industrial power-supply monitors.

For engineers reviewing the TL4050A10QDBZR datasheet, TL4050A10QDBZR pinout, TL4050A10QDBZR application, or TL4050A10QDBZR equivalent, key selection criteria include extended-temperature operation, low dynamic impedance (0.7Ω), thermal hysteresis (2.8mV), long-term stability (120ppm), and SOT-23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The TL4050A10QDBZR functions as a two-terminal shunt reference, sinking cathode current to regulate voltage at its cathode terminal relative to anode ground. Its internal bandgap core achieves tight initial accuracy and low drift via curvature-compensated design, with dynamic impedance minimized across 120Hz–1MHz to support fast transient response in feedback loops.

It requires no external capacitor for stability and tolerates full-range capacitive loading-enabling direct integration into high-precision data-acquisition front-ends and isolated sensor signal chains where output impedance and noise directly impact effective resolution.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with standard pinout: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC (no connection; parasitic Schottky diode to Pin 2 requires floating or tie to Pin 2).

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, TL4050A10QDBZR delivers identical 10V output and 0.1% tolerance but uniquely combines extended-temperature qualification (–40°C to 125°C), lowest min current (60μA), and SOT-23-3 pinout-making it optimal for automotive and compact industrial designs where thermal robustness and board space are critical.

Availability

TL4050A10QDBZR is available at Aetrix Electronics and suitable for automotive power-supply monitors, industrial data-acquisition systems, and portable energy metering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050A10QDBZR 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 automotive-grade components.

The TL4050 series belongs to TI's precision voltage reference product line, engineered specifically for high-accuracy, low-power, and thermally robust applications in automotive, industrial, and medical systems where long-term stability and extended-temperature operation are mandatory.

FAQ

What is the operating temperature range of TL4050A10QDBZR?

The TL4050A10QDBZR is characterized for operation from –40°C to 125°C, qualifying it for under-hood automotive applications and industrial environments with extreme thermal cycling. This extended range is explicitly defined in Section 5.11 of the datasheet for the "Q" grade variant, distinguishing it from the "I" grade (–40°C to 85°C). The device maintains ±0.1% initial tolerance and ±50ppm/°C temperature coefficient across this full range.

Does TL4050A10QDBZR require an external output capacitor?

No, TL4050A10QDBZR does not require an external output capacitor for stability. As confirmed in Section 8.1 of the datasheet, it is designed to remain stable with all capacitive loads-including direct connection to large bulk capacitors-eliminating the need for a dedicated bypass capacitor. This simplifies layout and reduces component count in space-constrained designs such as portable instrumentation and automotive ECUs.

What is the minimum cathode current required for TL4050A10QDBZR to regulate properly?

The TL4050A10QDBZR requires a minimum cathode current of 60μA (typical) and 110μA (maximum over temperature) to maintain regulation, as specified in Table 5.11. This low current threshold enables use in ultra-low-power applications like battery-backed sensors and energy harvesters, where supply current budgets are measured in microamps. External series resistor (RS) must be sized to guarantee this minimum current under worst-case supply and load conditions.

How is pin 3 used on the TL4050A10QDBZR SOT-23-3 package?

Pin 3 of the TL4050A10QDBZR in SOT-23-3 (DBZ) package is a no-connect (NC) terminal with an internal parasitic Schottky diode connected to Pin 2 (Anode). Per Section 8.2 of the datasheet, Pin 3 must either be left floating or tied directly to Pin 2. Connecting Pin 3 to any other node may forward-bias the parasitic diode and disrupt regulation or damage the device.

What is the wideband noise performance of TL4050A10QDBZR?

The TL4050A10QDBZR delivers 150μVRMS wideband noise over 10Hz to 10kHz, as specified in Table 5.11. This noise level directly impacts effective resolution in high-precision ADC applications: for a 10V reference feeding a 16-bit converter, it contributes ~0.25 LSB of RMS noise, preserving usable dynamic range without additional filtering. Noise is measured at 100μA cathode current and remains stable across operating current and temperature ranges.