Texas Instruments TL4051C12QDCKT

Overview

TL4051C12QDCKT 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, and 20μVRMS wideband noise. It operates from –40°C to 125°C, requires only 65μA minimum cathode current, and remains stable with all capacitive loads-enabling use in high-accuracy battery-powered instrumentation and automotive sensor signal conditioning.

For engineers reviewing the TL4051C12QDCKT datasheet, TL4051C12QDCKT pinout, TL4051C12QDCKT application, or TL4051C12QDCKT equivalent, key selection criteria include extended-temperature operation, low-noise performance at microamp bias, shunt topology compatibility with high-impedance feedback networks, and SC-70 package suitability for space-constrained PCB layouts.

Technical Context

The TL4051C12QDCKT implements a bandgap-based shunt reference architecture optimized for micropower operation across industrial and automotive ambient ranges. Its internal circuitry maintains stable 1.225V output over cathode currents from 65μA to 12mA while delivering 0.5Ω dynamic impedance at 1mA and thermal hysteresis of just 0.36mV/V over –40°C to 125°C cycling.

Unlike series references, this device functions as a two-terminal programmable sink: cathode draws current proportional to load demand and external series resistor value, while anode serves as the reference ground node. No output capacitor is required, and stability is guaranteed even with >100nF capacitive loading on the cathode terminal.

Key Specifications

Pinout & Package

TL4051C12QDCKT is housed in a 5-pin SC-70 (DCK) package with exposed pad for thermal enhancement. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is NC (no internal connection; must be left floating or tied to Anode per TI guidance), Pin 4 is NC, and Pin 5 is Anode (dual-anode configuration).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4051C12IDCKT, the TL4051C12QDCKT adds 40°C higher max operating temperature and automotive-grade qualification-justifying its use in engine bay modules. Against REF3012AIDBZR, it eliminates supply dependency and enables simpler two-wire sensor interfaces but requires careful series-resistor sizing for load regulation.

Availability

TL4051C12QDCKT is available at Aetrix Electronics and suitable for automotive sensor interfaces, battery-powered process transmitters, and high-accuracy data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4051C12QDCKT 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 for industrial, automotive, and personal electronics markets.

The TL4051 product line delivers micropower shunt voltage references optimized for high-accuracy, low-quiescent-current applications-including automotive sensor signal chains, portable instrumentation, and energy metering platforms-where space, power, and thermal robustness are critical constraints.

FAQ

What is the maximum operating temperature for TL4051C12QDCKT?

The TL4051C12QDCKT is characterized for continuous operation from –40°C to +125°C ambient temperature, making it suitable for under-hood automotive applications and industrial environments with elevated thermal stress. This extended range is confirmed in Section 5.5 of the official TI datasheet SLOS487A, which specifies electrical characteristics over the full –40°C to 125°C range for the Q-grade variant.

Does TL4051C12QDCKT require an output capacitor for stability?

No, TL4051C12QDCKT does not require an output capacitor for stability. As stated in Section 7.1 of the TI datasheet, the device is designed to remain stable with all capacitive loads-including values exceeding 100nF-and no external capacitor is needed across cathode and anode terminals. This simplifies layout and reduces BOM count in space-constrained designs.

What is the minimum cathode current needed for TL4051C12QDCKT to regulate properly?

The TL4051C12QDCKT requires a minimum cathode current of 65μA over its full operating temperature range (–40°C to 125°C), as specified in Table 5.5 of the TI datasheet. At 25°C, typical minimum current is 60μA, but design margins must accommodate the worst-case 65μA value to guarantee regulation across all conditions.

How does the SC-70 (DCK) package of TL4051C12QDCKT differ from the SOT-23 option?

The TL4051C12QDCKT uses a 5-pin SC-70 (DCK) package with dual anode pins (Pins 2 and 5) and two NC pins (Pins 3 and 4), whereas SOT-23 variants use a 3-pin DBZ package. The DCK package offers lower thermal resistance and improved high-frequency noise immunity due to its symmetric pinout and exposed pad-critical for precision analog layouts in automotive and industrial applications.

What is the long-term stability specification for TL4051C12QDCKT?

The TL4051C12QDCKT exhibits 120ppm long-term stability after 1000 hours of operation at 25°C ±0.1°C with 100μA cathode current, as documented in Section 5.5 of the TI datasheet. This parameter reflects drift due to silicon aging and ensures predictable calibration retention in field-deployed equipment such as utility meters and medical sensors.