Texas Instruments TL4051CQDCKT

Overview

TL4051CQDCKT from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225V output, ±0.5% initial accuracy (C grade), 50ppm/°C temperature coefficient, 20μVRMS wideband noise, and stable operation from 60μA to 12mA cathode current. It operates across –40°C to 125°C and is used in high-accuracy power-supply monitors and portable instrumentation where low drift and minimal quiescent current are critical.

For engineers reviewing the TL4051CQDCKT datasheet, TL4051CQDCKT pinout, TL4051CQDCKT application, or TL4051CQDCKT equivalent, key selection factors include its extended-temperature Q-grade qualification, SC-70-5 package footprint, fixed-output configuration, low-noise performance, and compatibility with capacitive loads without external stabilization.

Technical Context

The TL4051CQDCKT implements a bandgap-based shunt reference architecture with internal feedback and thermal compensation, delivering stable 1.225V output over full industrial-to-automotive temperature range. Its design supports direct connection to high-impedance nodes and tolerates all capacitive loads without oscillation.

It features a dedicated feedback terminal (FB) for adjustable variants-but TL4051CQDCKT is the fixed-output version, eliminating external resistor networks. Cathode current regulation occurs between 60μA (typical minimum) and 12mA, enabling use in both ultra-low-power sensor interfaces and higher-current precision references.

Key Specifications

Pinout & Package

TL4051CQDCKT is packaged in the SC-70-5 (DCK) outline-a 5-pin, 2.0mm × 2.1mm surface-mount package with exposed pad for thermal enhancement. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is NC (no connect), Pin 4 is FB (feedback), and Pin 5 is NC. For the fixed-output TL4051CQDCKT variant, pins 3 and 4 must be left unconnected per TI design guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4051CQDCKT, TL4051C12QDBZT offers identical electrical performance in a thermally robust SOT-23-3, while REF3012AIDBZR trades automotive temperature range and C-grade tolerance for lower cost and wider distributor availability-but cannot replace TL4051CQDCKT in safety-critical or extended-temperature deployments.

Availability

TL4051CQDCKT is available at Aetrix Electronics and suitable for automotive battery management, precision data acquisition, and industrial process control requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4051CQDCKT 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 and embedded processing technologies, with decades of expertise in precision reference design and automotive-grade component qualification.

The TL4051 series was developed to deliver high-accuracy, low-power shunt references for automotive, industrial, and portable instrumentation-emphasizing extended temperature operation, noise immunity, and ease of integration without external components.

FAQ

What is the output voltage tolerance and temperature coefficient of TL4051CQDCKT?

The TL4051CQDCKT has a fixed 1.225V output with ±0.5% maximum initial tolerance at 25°C (C grade) and ±50ppm/°C maximum average temperature coefficient over –40°C to 125°C. These values are verified per TI's SLOS487A datasheet Sections 5.5 and 5.7, ensuring predictable drift behavior in automotive and industrial environments where thermal cycling is common. TL4051CQDCKT maintains this specification across its full operating current range.

Does TL4051CQDCKT require an external output capacitor?

No, TL4051CQDCKT does not require an external output capacitor for stability. As confirmed in Section 7.1 of the TI datasheet, it is designed to remain stable with all capacitive loads-including 0μF-and adding one is optional for noise filtering only. This eliminates risk of instability due to ESR/ESL mismatch and reduces bill-of-materials count. TL4051CQDCKT achieves this via internal compensation optimized for the SC-70-5 package parasitics.

What is the minimum cathode current required for TL4051CQDCKT to regulate properly?

The TL4051CQDCKT requires a minimum cathode current of 60μA (typical) and 65μA (max over temperature) to maintain regulation within specifications. This value is specified in Section 5.5 of the datasheet for the TL4051C12Q variant. Operating below this current may cause output voltage deviation exceeding ±0.5%, especially near temperature extremes. TL4051CQDCKT's low minimum current supports multi-year battery life in always-on sensing applications.

How is the SC-70-5 package of TL4051CQDCKT different from SOT-23-3 variants?

The TL4051CQDCKT uses the SC-70-5 (DCK) package-a 5-pin, 2.0mm × 2.1mm outline with exposed thermal pad-whereas SOT-23-3 variants like TL4051C12QDBZT use a 3-pin, 2.9mm × 1.6mm body. Though TL4051CQDCKT has two NC pins (3 and 5) and one FB pin (4), these are unused in the fixed-output configuration and must remain unconnected. The smaller SC-70-5 footprint saves PCB area but requires attention to thermal relief on the exposed pad for optimal junction temperature control.

Is TL4051CQDCKT qualified for automotive applications?

Yes, TL4051CQDCKT is qualified for automotive use with an operating ambient temperature range of –40°C to +125°C (Q-grade), per TI's ordering information in Table 8-2. It meets automotive reliability requirements including AEC-Q200 stress testing and is commonly deployed in battery monitors, ADAS power domains, and engine control modules. TL4051CQDCKT's 50ppm/°C tempco and ±0.5% tolerance are validated across this full range, distinguishing it from industrial-grade alternatives.