Texas Instruments TL4051C12IDCKT

Overview

TL4051C12IDCKT 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 85°C and is used in high-accuracy data acquisition, battery-powered instrumentation, and power-supply monitoring circuits.

For engineers reviewing the TL4051C12IDCKT datasheet, TL4051C12IDCKT pinout, TL4051C12IDCKT application, or TL4051C12IDCKT equivalent, key selection criteria include its C-grade tolerance, SC-70-5 package footprint, low-noise performance at microamp bias, and compatibility with all capacitive loads without external stabilization.

Technical Context

The TL4051C12IDCKT implements a bandgap-based shunt reference architecture optimized for micropower operation. Its internal circuit maintains regulation via feedback-controlled Zener-like breakdown, delivering stable 1.225V output with dynamic impedance of 0.5Ω at 1mA and thermal hysteresis of 0.36mV/V over –40°C to 125°C cycling.

It requires no output capacitor and remains stable under full capacitive loading. The device supports both fixed-output (1.225V) and adjustable configurations, though TL4051C12IDCKT is factory-configured as fixed-output with cathode-anode-terminal topology and no feedback pin.

Key Specifications

Pinout & Package

TL4051C12IDCKT is housed in a 5-pin SC-70 package (DCK), with pin 1 = Cathode, pin 2 = Anode, pin 3 = NC (no internal connection), pin 4 = NC, pin 5 = NC. Pins 3–5 are unconnected die pads; only pins 1 and 2 are electrically active. The device functions as a two-terminal shunt reference.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3012AIDBZR and LM4040C12IDCKR, TL4051C12IDCKT offers the lowest noise (20μVRMS) and guaranteed zero-capacitor stability in the SC-70-5 footprint, making it optimal for space-constrained, low-drift, low-noise applications where C-grade accuracy suffices.

Availability

TL4051C12IDCKT is available at Aetrix Electronics and suitable for data-acquisition systems, portable instrumentation, and energy metering applications requiring stable component supply, long-term parametric consistency, and RoHS-compliant packaging.

Supply support for TL4051C12IDCKT 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 industrial-grade components.

The TL4051 series was designed for high-accuracy, low-power shunt reference applications in portable, battery-operated, and metrology-grade systems where minimal quiescent current and predictable thermal behavior are essential.

FAQ

What is the operating temperature range for TL4051C12IDCKT?

The TL4051C12IDCKT is specified for industrial temperature operation from –40°C to +85°C. This range is validated per TI's characterization data in Section 5.4 of the datasheet and applies to all electrical parameters including initial accuracy, temperature coefficient, and dynamic impedance.

Does TL4051C12IDCKT require an output capacitor for stability?

No, TL4051C12IDCKT does not require an output capacitor. It is explicitly designed to remain stable with all capacitive loads from 1pF to 10μF, as confirmed in Section 7.1 and Section 3 of the datasheet. Adding a capacitor is optional and does not improve stability.

What is the minimum cathode current needed for TL4051C12IDCKT to regulate properly?

The TL4051C12IDCKT requires a minimum cathode current of 60μA (typical) and 65μA (max over temperature) to maintain regulation within specifications. Below this, output voltage deviates beyond the ±0.5% initial tolerance band, as documented in Table 5.4.

How does the 50ppm/°C temperature coefficient of TL4051C12IDCKT translate to voltage drift over temperature?

With a nominal 1.225V output and ±50ppm/°C coefficient, TL4051C12IDCKT exhibits ≤±0.49mV/°C drift. Over the full –40°C to +85°C range (125°C span), maximum drift is ±6.125mV - well within the ±10.1mV full-range tolerance limit specified in Table 5.4.

Is TL4051C12IDCKT pin-compatible with other SC-70 shunt references like LM4040C12IDCKR?

Yes, TL4051C12IDCKT uses the same SC-70-5 package with identical pin 1 (cathode) and pin 2 (anode) assignments as LM4040C12IDCKR. Pins 3–5 are NC on both devices. However, functional equivalence requires verification of noise, tempco, and load regulation - TL4051C12IDCKT offers lower noise (20μVRMS vs 35μVRMS) and tighter tempco (50ppm/°C vs 100ppm/°C).