Texas Instruments TL4050B50QDCKR

Overview

TL4050B50QDCKR from Texas Instruments is a precision micropower shunt voltage reference delivering a stable 5.0 V output with ±0.2% initial tolerance (max) and ±50 ppm/°C temperature coefficient across –40°C to 125°C. It operates from 60 μA to 15 mA cathode current, exhibits 93 μV_RMS wideband noise (10 Hz–10 kHz), and maintains stability with any capacitive load-enabling use in high-accuracy data acquisition and automotive power-supply monitoring.

For engineers reviewing the TL4050B50QDCKR datasheet, TL4050B50QDCKR pinout, TL4050B50QDCKR application, or TL4050B50QDCKR equivalent, key selection criteria include extended-temperature operation, low-noise performance, minimal bias current requirement, and SOT-23-3/SC-70 package compatibility in space-constrained industrial and automotive designs.

Technical Context

The TL4050B50QDCKR functions as a two-terminal shunt reference, sinking cathode current to regulate voltage across its terminals. Its internal bandgap core achieves tight initial accuracy and low thermal drift via curvature-compensated design, while low dynamic impedance (0.5 Ω at 1 mA) ensures minimal output variation under load transients.

It requires no external capacitor for stability and supports operation across full cathode current range (60 μA–15 mA) without oscillation-even when driving large capacitive loads. Thermal hysteresis is specified at 1.4 mV over –40°C to 125°C cycling, confirming robust long-term repeatability in harsh environments.

Key Specifications

Pinout & Package

TL4050B50QDCKR is packaged in SC-70 (DCK), a 3-pin surface-mount package measuring 2.0 mm × 2.1 mm × 0.9 mm with gull-wing leads. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is NC (no connect) - internally floating or tied to Pin 2 per TI's SOT-23/SC-70 parasitic diode constraint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050A50QDCKR, TL4050B50QDCKR trades 0.1% tolerance for lower cost while retaining identical thermal stability and noise; versus REF3050AIDBZR, it eliminates output capacitance requirements and simplifies layout-but demands external current limiting.

Availability

TL4050B50QDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, automotive electronics, and industrial process controls requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050B50QDCKR 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 specializing in analog, embedded processing, and digital signal technologies, with decades of expertise in precision analog ICs.

The TL4050 family was designed specifically for cost-sensitive, high-stability shunt reference applications in automotive, industrial, and portable instrumentation-emphasizing micropower operation, wide temperature capability, and capacitor-free stability.

FAQ

What is the maximum cathode current rating for TL4050B50QDCKR?

The absolute maximum cathode current for TL4050B50QDCKR is 15 mA, as specified in the Absolute Maximum Ratings table. Operation beyond this limit risks permanent damage due to junction overheating. For reliable long-term performance, design cathode current within the recommended 60 μA to 15 mA range, ensuring adequate power dissipation margin based on ambient temperature and package thermal resistance (252 °C/W for DCK).

Does TL4050B50QDCKR require an output capacitor for stability?

No, TL4050B50QDCKR does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads-from 0 pF up to several microfarads-making it ideal for space-constrained layouts where bypass caps would add cost and footprint. This feature is explicitly confirmed in the datasheet's "Stable with all capacitive loads" specification and Section 8.1.

What is the thermal hysteresis specification for TL4050B50QDCKR?

The thermal hysteresis of TL4050B50QDCKR is 1.4 mV, defined as the difference between its 25°C output voltage after cycling to –40°C versus after cycling to 125°C. This parameter reflects mechanical stress memory in the silicon and packaging; it directly impacts calibration repeatability in systems undergoing repeated thermal excursions, such as automotive ECUs or outdoor industrial controllers.

Can TL4050B50QDCKR be used in place of TL4050B41QDCKR?

No-TL4050B50QDCKR and TL4050B41QDCKR are not interchangeable without circuit redesign. While both share the same B-grade accuracy, Q-temp range, and SC-70 package, their output voltages differ: TL4050B50QDCKR delivers 5.0 V, whereas TL4050B41QDCKR outputs 4.096 V. Substituting one for the other will cause systematic gain errors in ADC/DAC interfaces calibrated for the original voltage.

What is the long-term stability of TL4050B50QDCKR over 1000 hours?

TL4050B50QDCKR exhibits 120 ppm long-term stability after 1000 hours of operation at 25°C ± 0.1°C with 100 μA cathode current. This value represents typical parametric drift due to silicon aging and is consistent across all TL4050 grades and output voltages. It informs reliability modeling for systems requiring decade-level calibration intervals, such as utility metering or aerospace subsystems.