Texas Instruments TL4051B12IDCKT

Overview

TL4051B12IDCKT from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225V output, ±0.2% initial accuracy (B grade), 50ppm/°C temperature coefficient, 20μVRMS wideband noise, and stable operation from 60μA to 12mA cathode current. It serves as a high-stability reference in portable data-acquisition systems requiring low quiescent current and minimal board space.

For engineers reviewing the TL4051B12IDCKT datasheet, TL4051B12IDCKT pinout, TL4051B12IDCKT application, or TL4051B12IDCKT equivalent, key selection criteria include guaranteed 0.2% tolerance at 25°C, industrial temperature range (–40°C to 85°C), SC-70-5 package compatibility, and no-output-capacitor stability for battery-powered instrumentation.

Technical Context

The TL4051B12IDCKT operates as a two-terminal shunt reference, regulating voltage by sinking adjustable cathode current while maintaining a precise 1.225V reverse breakdown across its terminals. Its internal bandgap core delivers low thermal hysteresis (0.36mV/V) and long-term stability (120ppm over 1000h).

It exhibits low dynamic impedance (0.5Ω at 1mA, 120Hz) and supports full capacitive load stability without external compensation-enabling direct integration into ADC reference inputs, DAC bias networks, and precision power-supply monitor circuits.

Key Specifications

Pinout & Package

TL4051B12IDCKT is packaged in SC-70-5 (DCK), a 5-pin surface-mount 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, Pin 5 is NC. The device functions as a two-terminal shunt reference; only Cathode and Anode are electrically active.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4051B12IDBZT, TL4051B12IDCKT saves 30% board area and improves thermal dissipation margin; versus REF3012AIDBZR, it eliminates capacitor dependency and reduces minimum operating current by 10μA-critical for energy harvesting and coin-cell applications.

Availability

TL4051B12IDCKT is available at Aetrix Electronics and suitable for portable instrumentation, industrial power-monitoring systems, and battery-health diagnostics requiring stable component supply, consistent parametric performance, and long-lifecycle availability.

Supply support for TL4051B12IDCKT 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and personal electronics markets.

The TL4051 series was designed specifically for micropower, space-constrained shunt reference applications-emphasizing zero-capacitor stability, sub-100μA operation, and robustness across extended temperature ranges.

FAQ

What is the maximum cathode current rating for TL4051B12IDCKT?

The TL4051B12IDCKT has an absolute maximum cathode current rating of 20mA, but its recommended operating range is 60μA to 12mA per the datasheet. Operating above 12mA risks exceeding thermal limits in the SC-70-5 package, especially at elevated ambient temperatures, and may degrade long-term stability beyond the specified 120ppm over 1000 hours.

Does TL4051B12IDCKT require an output capacitor for stability?

No, TL4051B12IDCKT does not require an output capacitor for stability. It is explicitly characterized as stable with all capacitive loads-including 0μF-and TI confirms no external capacitor is needed. This eliminates BOM cost and PCB area, making TL4051B12IDCKT ideal for ultra-compact, low-power designs where capacitor placement is impractical.

What is the function of Pin 3 on TL4051B12IDCKT?

Pin 3 on TL4051B12IDCKT is a no-connect (NC) terminal with no internal bond wire. TI documentation states it must be left floating or connected to the Anode (Pin 2) to mitigate electromagnetic interference in noisy environments-such as near switching regulators or transformers-without affecting electrical performance.

How does the temperature coefficient of TL4051B12IDCKT impact accuracy over –40°C to 85°C?

With a maximum temperature coefficient of 50ppm/°C, TL4051B12IDCKT contributes up to ±61.25μV/°C drift. Across the full –40°C to 85°C range (125°C ΔT), worst-case drift is ±6.25mV (0.51% of 1.225V),叠加 ±0.2% initial tolerance yields a total error band of ±0.71%-well within requirements for 12-bit systems and acceptable for calibrated 14-bit implementations.

Can TL4051B12IDCKT be used in automotive under-hood applications?

TL4051B12IDCKT is rated for –40°C to +85°C operation and is not qualified for automotive under-hood use (which typically requires AEC-Q100 Grade 1 or 0, –40°C to +125°C). For such environments, TI's TL4051B12QDCKT (–40°C to +125°C, Q-grade) is the qualified alternative-TL4051B12IDCKT itself lacks the extended temperature validation and qualification testing required for under-hood deployment.