Texas Instruments TL4050A25QDCKT

Overview

TL4050A25QDCKT from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±0.1% initial tolerance and ±50 ppm/°C temperature coefficient over –40°C to 125°C. It operates from 60 μA to 15 mA cathode current, exhibits 41 μV_RMS wideband noise, and maintains stability with all capacitive loads-enabling use in high-accuracy data acquisition and automotive power-supply monitoring.

For engineers reviewing the TL4050A25QDCKT datasheet, TL4050A25QDCKT pinout, TL4050A25QDCKT application, or TL4050A25QDCKT equivalent, key selection criteria include extended-temperature operation, low dynamic impedance (0.3 Ω), thermal hysteresis (0.7 mV), long-term stability (120 ppm), and SC-70 package compatibility for space-constrained embedded systems.

Technical Context

The TL4050A25QDCKT functions as a two-terminal shunt reference, requiring only an external series resistor to regulate voltage across a load. Its internal bandgap core achieves tight initial accuracy and low drift via curvature-compensated design, with reverse dynamic impedance of 0.3 Ω at 1 mA enabling minimal output voltage shift under varying load currents.

It is characterized across –40°C to 125°C ambient, with guaranteed performance including 0.3–0.8 mV output change over 60 μA–1 mA cathode current and ≤8 mV change up to 15 mA. Thermal hysteresis is specified at 0.7 mV, and long-term stability is 120 ppm after 1000 hours at 25°C.

Key Specifications

Pinout & Package

TL4050A25QDCKT is housed in a 3-pin SC-70 (DCK) package, measuring 2.0 mm × 2.1 mm × 0.9 mm, optimized for high-density 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 REF3025AIDBZR and LM4040C25IDCKR, TL4050A25QDCKT delivers superior initial accuracy and extended-temperature qualification-making it the only choice among the three for automotive-grade 2.5 V reference needs without derating or additional calibration.

Availability

TL4050A25QDCKT is available at Aetrix Electronics and suitable for automotive power-supply monitors, industrial process controls, and battery-powered equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050A25QDCKT 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 for high-accuracy, low-drift, and micropower operation in safety-critical and thermally demanding environments.

FAQ

What is the maximum cathode current rating for TL4050A25QDCKT?

The absolute maximum cathode current for TL4050A25QDCKT is 20 mA, but the recommended operating range is 65 μA to 15 mA. Operating above 15 mA risks exceeding thermal limits in the SC-70 package, especially at high ambient temperatures. The device's 0.3 Ω dynamic impedance ensures stable regulation within this range, and TI specifies 15 mA as the upper limit for guaranteed electrical performance across –40°C to 125°C.

Does TL4050A25QDCKT require an output capacitor for stability?

No, TL4050A25QDCKT does not require an output capacitor for stability. Its internal design is inherently stable with all capacitive loads, including direct connection to ADC reference inputs or op-amp feedback networks. While adding a capacitor (e.g., 100 nF) may further reduce high-frequency noise, it is never necessary for loop stability-eliminating a common failure point in space-constrained or high-reliability designs using TL4050A25QDCKT.

How does the SC-70 package of TL4050A25QDCKT affect thermal performance?

The SC-70 (DCK) package of TL4050A25QDCKT has a thermal impedance (θ_JA) of 252°C/W, meaning junction temperature rises ~25°C per milliwatt of dissipated power in still air. At 15 mA and 2.5 V, power dissipation is 37.5 mW, resulting in ~9.5°C rise above ambient. This allows reliable operation up to 125°C ambient, provided PCB copper area and airflow meet TI's layout recommendations-confirming TL4050A25QDCKT's suitability for sealed automotive enclosures.

Can TL4050A25QDCKT be used as a replacement for TL4050A25IDCKT?

Yes, TL4050A25QDCKT can replace TL4050A25IDCKT in designs requiring extended temperature operation, as both share identical SC-70 packaging, pinout, and electrical specs-except TL4050A25QDCKT is rated for –40°C to 125°C versus –40°C to 85°C for the 'I' version. No PCB or schematic changes are needed; however, validation across the full 125°C range is required for automotive or industrial deployments using TL4050A25QDCKT.

What is the thermal hysteresis specification for TL4050A25QDCKT, and why does it matter?

TL4050A25QDCKT has a thermal hysteresis of 0.7 mV, defined as the difference in 2.5 V output measured at 25°C after cycling to –40°C versus after cycling to 125°C. This parameter matters in applications like automotive ECU calibration or field instrument recalibration, where repeated thermal cycling must not introduce irreversible offset shifts. A 0.7 mV hysteresis corresponds to just 0.028% of full scale-critical for maintaining traceable accuracy without periodic re-zeroing.