Texas Instruments TL4050C25QDCKR

Overview

TL4050C25QDCKR from Texas Instruments is a precision 2.5V shunt voltage reference in SC-70-3 package, rated for –40°C to 125°C operation, with ±0.5% initial tolerance, 50ppm/°C temperature coefficient, 41μVRMS noise, and stable operation down to 65μA cathode current. It serves as a low-power, high-stability reference in battery-powered data-acquisition front-ends.

For engineers reviewing the TL4050C25QDCKR datasheet, TL4050C25QDCKR pinout, TL4050C25QDCKR application, or TL4050C25QDCKR equivalent, key selection criteria include extended-temperature shunt reference performance, micropower biasing capability, noise-sensitive ADC/DAC reference requirements, and SOT-23/SC-70 footprint compatibility.

Technical Context

The TL4050C25QDCKR operates as a two-terminal shunt reference, requiring only an external series resistor to regulate cathode current between 65μA (min) and 15mA (max). Its internal bandgap core delivers fixed 2.5V reverse breakdown voltage with thermal hysteresis of 0.7mV over –40°C to 125°C cycling.

Designed for capacitive-load stability without output capacitor, it maintains low dynamic impedance (0.3Ω at 1mA/120Hz) and wide-band noise of 41μVRMS (10Hz–10kHz), enabling direct use in high-resolution analog signal chains where supply rejection and low drift are critical.

Key Specifications

Pinout & Package

TL4050C25QDCKR uses the SC-70-3 (DCK) package: 2.0mm × 2.1mm × 0.9mm body, 0.65mm pitch, gull-wing leads. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC (no internal connection; must be left floating or tied to Pin 2 per TI design note).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C25QDCKR, REF3025AIDBZR offers improved initial accuracy at identical package and temperature rating, while MAX6002EUR+T trades tempco and package compatibility for second-source availability in legacy SOT-23 designs.

Availability

TL4050C25QDCKR is available at Aetrix Electronics and suitable for automotive battery monitoring, portable data loggers, and industrial process transmitters requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050C25QDCKR 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 product line delivers micropower shunt references optimized for high-accuracy, low-drift applications in harsh environments-specifically targeting data acquisition, battery monitoring, and industrial control systems.

FAQ

What is the minimum cathode current required for TL4050C25QDCKR to maintain regulation?

The TL4050C25QDCKR requires a minimum cathode current of 65μA across its full operating temperature range of –40°C to 125°C. This value is specified in Section 5.5 of the datasheet under "IZ,min Full range" for the C-grade device. Operating below this current may result in loss of output voltage regulation and increased temperature coefficient error. The TL4050C25QDCKR remains functional at this micropower level, making it suitable for ultra-low-power applications such as battery-backed sensors.

Does TL4050C25QDCKR require an external output capacitor for stability?

No, TL4050C25QDCKR does not require an external output capacitor for stability. As confirmed in Section 8.1 and Feature list, it is designed to remain stable with all capacitive loads-including 0μF-and adding a capacitor is optional. This eliminates BOM cost and PCB area in space-constrained designs. However, if used, the capacitor must be placed directly between cathode and anode pins, and no series resistance is needed due to inherent stability.

What is the thermal hysteresis specification for TL4050C25QDCKR?

The thermal hysteresis of TL4050C25QDCKR is 0.7mV, defined as the difference between the 25°C output voltage measured after cycling to –40°C versus after cycling to 125°C. This parameter is explicitly listed in Table 5.5 under "VHYST" and applies to all grades (A/B/C) of the TL4050x25Q family. It represents a key repeatability metric for applications undergoing repeated thermal stress, such as automotive under-hood modules.

How does the 50ppm/°C temperature coefficient of TL4050C25QDCKR translate to voltage drift over temperature?

With a nominal 2.5V output and ±50ppm/°C temperature coefficient, TL4050C25QDCKR exhibits a maximum drift of ±1.25mV across its full –40°C to 125°C operating range (165°C span). This is calculated as 2.5V × 50ppm/°C × 165°C = 0.0020625V ≈ ±2.06mV worst-case, but the datasheet guarantees ±1.25mV max via characterization. This drift budget is critical for calibrating 12-bit systems where 1 LSB = 610μV at 2.5V full scale.

What is the pin configuration of TL4050C25QDCKR in the SC-70-3 package?

TL4050C25QDCKR uses the SC-70-3 (DCK) package with three gull-wing leads: Pin 1 is Cathode (output), Pin 2 is Anode (ground reference), and Pin 3 is NC (no internal connection). Per TI's guidance in Section 8.2, Pin 3 must be left floating or tied to Pin 2-never driven-to avoid unintended conduction paths. This pinout is distinct from SOT-23-3 variants and verified in TI's mechanical drawings for DCK package.