Texas Instruments TL4051AQDBZT

Overview

TL4051AQDBZT from Texas Instruments is a precision micropower shunt voltage reference with fixed 1.225V output, ±0.1% initial accuracy (A grade), 50ppm/°C temperature coefficient, 20μVRMS wideband noise, and operation across –40°C to 125°C. It functions as a stable voltage reference in high-accuracy analog signal chains for battery-powered instrumentation and automotive power-supply monitors.

For engineers reviewing the TL4051AQDBZT datasheet, TL4051AQDBZT pinout, TL4051AQDBZT application, or TL4051AQDBZT equivalent, key selection factors include its extended-temperature qualification, ultra-low cathode current (60μA typical), no-output-capacitor stability, and SOT-23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The TL4051AQDBZT implements a bandgap-based shunt reference architecture with internal feedback and trimming for tight initial tolerance and low thermal drift. Its design supports operation over a 60μA–12mA cathode current range while maintaining <8mV output variation across full load and temperature extremes.

It features a 0.5Ω dynamic impedance at 1mA and exhibits stable behavior with all capacitive loads-eliminating mandatory output capacitance. The device's feedback terminal (FB) enables adjustable configurations, though TL4051AQDBZT is the fixed 1.225V variant and does not utilize FB in standard operation.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with 1.4mm × 2.9mm footprint, 1.1mm height, and gull-wing leads. RoHS-compliant, Pb-free, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4051AQDBZT, REF3012AIDBZR trades 0.1% tolerance and 125°C operation for lower unit cost, while MAX6012BEUR+T matches initial accuracy but lacks automotive-grade thermal range and exhibits higher drift-making TL4051AQDBZT optimal for high-reliability, extended-temperature designs.

Availability

TL4051AQDBZT is available at Aetrix Electronics and suitable for automotive electronics, precision data acquisition, and energy metering requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for TL4051AQDBZT 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-qualified components.

The TL4051 series was developed to deliver high-accuracy, micropower shunt references for safety-critical and battery-sensitive applications where size, thermal stability, and long-term reliability are paramount.

FAQ

What is the maximum cathode current rating for TL4051AQDBZT?

The absolute maximum cathode current for TL4051AQDBZT is 20mA, but the recommended operating limit is 12mA to ensure parametric performance and thermal reliability. Exceeding 12mA may increase junction temperature beyond safe margins, especially in SOT-23-3 packages with θ_JA = 206°C/W. Always verify power dissipation using P_D = (T_J(max) – T_A)/θ_JA in your layout.

Does TL4051AQDBZT require an output capacitor for stability?

No, TL4051AQDBZT does not require an output capacitor and is explicitly designed to remain stable with all capacitive loads-including zero capacitance. This eliminates capacitor-related aging, leakage, and board-space constraints. If added for filtering, any ceramic or tantalum capacitor up to 100µF may be used without risk of oscillation.

Is TL4051AQDBZT pin-compatible with other TL4051 variants in SOT-23-3?

Yes, TL4051AQDBZT shares identical SOT-23-3 pinout (CATHODE–ANODE–FB) and mechanical footprint with all TL4051xQ and TL4051xI variants in DBZ packaging. However, the FB pin is unused in TL4051AQDBZT and must remain unconnected; it is actively used only in adjustable versions.

What is the thermal hysteresis specification for TL4051AQDBZT?

TL4051AQDBZT has a thermal hysteresis of 0.36mV/V, measured as the difference between V_Z at 25°C after cycling to –40°C versus after cycling to 125°C. This low hysteresis ensures repeatable reference voltage across thermal cycles, critical for calibration-critical instruments and field-deployed meters where thermal history affects measurement fidelity.

Can TL4051AQDBZT be used in adjustable configurations?

No-TL4051AQDBZT is the fixed 1.225V output variant and is not intended for adjustable use. Its FB pin is internally connected and not functional for external resistor-divider programming. For adjustable operation across 1.225V–10V, select TL4051AQDBZR (same grade and temperature range) or TL4051AQDCKR in SC-70.