Texas Instruments TL4051B12QDCKT

Overview

TL4051B12QDCKT 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 operation across –40°C to 125°C. It delivers stable reference performance in low-current, high-accuracy analog signal chains for battery-powered instrumentation and automotive power-supply monitors.

For engineers reviewing the TL4051B12QDCKT datasheet, TL4051B12QDCKT pinout, TL4051B12QDCKT application, or TL4051B12QDCKT equivalent, key selection criteria include its extended-temperature qualification, ultra-low cathode current (60μA typ), no-output-capacitor stability, and SC-70 package compatibility with space-constrained PCB layouts.

Technical Context

The TL4051B12QDCKT operates as a two-terminal shunt reference requiring only an external current-limiting resistor. Its internal bandgap core achieves ±50ppm/°C max drift over –40°C to 125°C and maintains 0.5Ω dynamic impedance at 1mA, enabling precise regulation under varying load and supply conditions.

Unlike series references, it draws cathode current (IZ) ranging from 60μA to 12mA - with minimum operating current validated at 65μA over full temperature range - and exhibits thermal hysteresis of just 0.36mV/V after cycling between –40°C and 125°C, critical for repeatable metrology-grade measurements.

Key Specifications

Pinout & Package

TL4051B12QDCKT is packaged in a 5-pin SC-70 (DCK) outline per JEDEC MO-203AB. 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 contains a parasitic Schottky diode between Pins 2 and 3; improper connection risks forward conduction and reference instability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4051B12IDCKT, TL4051B12QDCKT adds 125°C operation for automotive under-hood use; compared with REF3012AIDBZR, it offers lower minimum current and SC-70 footprint flexibility but requires attention to NC pin handling.

Availability

TL4051B12QDCKT is available at Aetrix Electronics and suitable for automotive electronics, precision instrumentation, and battery-powered equipment requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TL4051B12QDCKT 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 delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.

The TL4051 series was designed specifically for precision shunt reference applications demanding micropower operation, wide temperature range, and capacitor-free stability - targeting data acquisition, power monitoring, and portable instrumentation.

FAQ

What is the maximum cathode current rating for TL4051B12QDCKT?

The absolute maximum cathode current for TL4051B12QDCKT is 20mA, but the recommended operating limit is 12mA to ensure long-term reliability and maintain specified electrical characteristics across –40°C to 125°C. Exceeding 12mA may increase thermal stress and accelerate parametric drift over time. Always verify power dissipation using PD = (VZ × IZ) and ensure junction temperature remains below 150°C.

Does TL4051B12QDCKT require an output capacitor for stability?

No, TL4051B12QDCKT does not require an output capacitor for stability and is explicitly characterized to remain stable with all capacitive loads. This eliminates the need for external bypass components, reducing bill-of-materials cost and PCB area. However, if added for noise filtering, the device tolerates any capacitance value without oscillation risk - a key advantage over many competing shunt references.

How is the SC-70 package pinout configured for TL4051B12QDCKT?

TL4051B12QDCKT uses a 5-pin SC-70 (DCK) package: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC (must be left floating or tied to Anode), Pins 4 and 5 = NC. TI documentation confirms Pin 3 contains a parasitic Schottky diode to Pin 2; incorrect connection introduces leakage paths that degrade reference accuracy and temperature stability. Always follow TI's SOT-23/SC-70 pin connection guidance in Section 7.2.

What is the long-term stability specification for TL4051B12QDCKT?

TL4051B12QDCKT exhibits 120ppm long-term stability after 1000 hours of operation at 25°C ± 0.1°C with 100μA cathode current. This metric reflects cumulative drift due to silicon aging and is measured under controlled burn-in conditions. In real-world applications, actual drift is typically lower - especially when operated below maximum ratings - supporting multi-decade reliability in energy metering and process control systems where calibration intervals exceed five years.

Can TL4051B12QDCKT be used in adjustable-output configurations?

No, TL4051B12QDCKT is the fixed-output variant (1.225V) and does not support adjustable operation. Only part numbers ending in "Q" *and* "I" (e.g., TL4051BQDCKT) or "AQ", "CQ" denote the adjustable version with FB pin functionality. TL4051B12QDCKT lacks the internal feedback node and has only Cathode and Anode terminals - attempting to configure it as adjustable will result in undefined behavior and loss of regulation.