Texas Instruments TL4051CIDBZT

Overview

TL4051CIDBZT 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 serves as a low-drift, low-noise reference in portable data-acquisition systems requiring high stability under varying load and temperature.

For engineers reviewing the TL4051CIDBZT datasheet, TL4051CIDBZT pinout, TL4051CIDBZT application, or TL4051CIDBZT equivalent, key selection criteria include its SOT-23-3 package, industrial temperature range (–40°C to 85°C), no-output-capacitor-required stability, and compatibility with high-EMI environments via optional anode connection.

Technical Context

The TL4051CIDBZT implements a bandgap-based shunt reference architecture with internal feedback control, delivering precise 1.225V output without external components. Its design supports operation across full industrial temperature range while maintaining tight tolerance and low dynamic impedance (0.5Ω at 1mA).

It features ultra-low quiescent current (60μA typical), thermal hysteresis of 0.36mV/V, and long-term stability of 120ppm over 1000 hours - enabling reliable performance in battery-powered instrumentation and precision analog front-ends where drift and noise directly impact measurement fidelity.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with 1.0mm pitch, 2.92mm × 1.3mm footprint, and exposed pad for thermal dissipation. RoHS-compliant, lead-free NIPDAU/SN finish, MSL Level-1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C12IDBZR and REF3012AIDBZR, TL4051CIDBZT delivers superior noise performance and lower minimum operating current while maintaining identical accuracy and temperature coefficient - making it optimal for portable, high-fidelity analog measurement systems.

Availability

TL4051CIDBZT is available at Aetrix Electronics and suitable for data-acquisition systems, power-supply monitors, and battery-powered equipment requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for TL4051CIDBZT 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 high-reliability manufacturing.

The TL4051 series belongs to TI's precision voltage reference product line, engineered specifically for low-power, high-stability applications in instrumentation, energy metering, and portable test equipment where accuracy, noise, and thermal behavior are critical.

FAQ

What is the operating temperature range for TL4051CIDBZT?

The TL4051CIDBZT is characterized for industrial temperature operation from –40°C to +85°C. This range is validated per TI's datasheet Section 5.3 and applies across all electrical specifications including initial accuracy, temperature coefficient, and dynamic impedance - ensuring reliable performance in outdoor industrial sensors and automotive cabin electronics.

Does TL4051CIDBZT require an output capacitor for stability?

No, TL4051CIDBZT does not require an output capacitor. As confirmed in Section 7.1 of the datasheet, it is inherently stable with all capacitive loads up to at least 10µF. This eliminates the need for external bypass capacitors, reducing BOM count and PCB area - especially valuable in compact SOT-23-3 layouts used in wearables and IoT edge nodes.

What is the minimum cathode current needed for TL4051CIDBZT to regulate properly?

The TL4051CIDBZT requires a minimum cathode current of 60μA (typical) and 65μA (max over temperature) to maintain regulation within specification. This value is specified in Section 5.4 (TL4051C12I Electrical Characteristics) and enables operation in ultra-low-power applications such as coin-cell-powered data loggers where supply current must remain below 100μA.

How does the TL4051CIDBZT differ from adjustable versions like TL4051CIDBZR?

TL4051CIDBZT is the fixed 1.225V output variant in SOT-23-3 packaging with tape-and-reel quantity of 250. Unlike adjustable versions (e.g., TL4051CIDBZR), it lacks an external feedback pin and uses internal resistor trimming for 1.225V output - simplifying design, eliminating external resistor errors, and improving long-term stability by removing external component drift sources.

Is TL4051CIDBZT pin-compatible with other shunt references in SOT-23-3?

TL4051CIDBZT uses standard SOT-23-3 pinout (CATHODE–ANODE–FB), but FB is internally connected and unused in the fixed-voltage version. While physically compatible with many SOT-23-3 shunt references, functional pin compatibility depends on circuit topology - e.g., devices requiring active FB connection (like adjustable TL4051AI variants) are not functionally interchangeable with TL4051CIDBZT without schematic revision.