Texas Instruments TL4051BIDCKT

Overview

TL4051BIDCKT 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 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 TL4051BIDCKT datasheet, TL4051BIDCKT pinout, TL4051BIDCKT application, or TL4051BIDCKT equivalent, key selection criteria include its SC-70 package footprint, low-noise shunt topology, absence of required output capacitor, and compatibility with capacitive loads up to 10μF without instability.

Technical Context

The TL4051BIDCKT implements a bandgap-based shunt reference architecture with internal feedback control, delivering stable 1.225V output independent of cathode current over 60μA–12mA. Its design eliminates need for external compensation while maintaining <0.5Ω dynamic impedance at 1mA and thermal hysteresis of 0.36mV/V across –40°C to 125°C cycling.

It features a three-terminal configuration (Cathode, Anode, Feedback) optimized for adjustable or fixed-voltage configurations; the B-grade variant targets cost-sensitive industrial applications requiring tighter tolerance than C-grade but relaxed vs A-grade, with identical temperature coefficient and noise performance across grades.

Key Specifications

Pinout & Package

TL4051BIDCKT is packaged in SC-70 (DCK), a 5-pin surface-mount package with 0.65mm pitch and 2.0mm × 1.25mm footprint. Pin 1 is Cathode, Pin 2 is Anode, Pin 3 is NC (no internal connection), Pin 4 is Feedback, Pin 5 is Anode (tied internally to Pin 2). The NC pin must remain unconnected per TI design guidance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4051AIDCKT, TL4051BIDCKT trades 0.1% initial accuracy for lower unit cost while retaining identical noise, tempco, and micropower capability; versus REF3012AIDBZR, it delivers superior noise performance and lower operating current but requires SC-70 layout adaptation.

Availability

TL4051BIDCKT is available at Aetrix Electronics and suitable for data-acquisition systems, power-supply monitors, and battery-powered instrumentation requiring stable component supply with guaranteed long-term availability and consistent parametric performance.

Supply support for TL4051BIDCKT 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 broad industrial portfolio coverage.

The TL4051 series was designed for high-accuracy, low-power shunt reference applications in space-constrained and battery-operated systems, emphasizing stability across temperature, time, and load variations without external components.

FAQ

What is the maximum cathode current rating for TL4051BIDCKT?

The absolute maximum cathode current for TL4051BIDCKT is 20mA per Absolute Maximum Ratings (Section 5.1), but the recommended operating range is 60μA to 12mA. Operating above 12mA risks exceeding thermal limits in the SC-70 package, especially at elevated ambient temperatures, and may degrade long-term stability. Always verify power dissipation using θJA = 252°C/W and TJ(max) = 150°C.

Does TL4051BIDCKT require an output capacitor for stability?

No, TL4051BIDCKT does not require an output capacitor and is explicitly characterized as stable with all capacitive loads, including up to 10μF. This eliminates mandatory bypassing in low-noise designs and avoids ESR-related oscillation risks common in other shunt references. Adding a capacitor is optional and only beneficial for localized high-frequency noise suppression.

What is the function of Pin 3 (NC) on TL4051BIDCKT?

Pin 3 on TL4051BIDCKT is a no-connect terminal with no internal connection. TI documentation mandates that it remain unconnected; tying it to Anode or Cathode may alter device behavior or reliability. This pin exists for mechanical symmetry and family pinout consistency across adjustable variants, but it serves no electrical purpose in the fixed-output TL4051BIDCKT.

How does TL4051BIDCKT perform at –40°C and 85°C?

TL4051BIDCKT is fully specified over –40°C to 85°C (I-grade). Its reverse breakdown voltage changes by ≤±10.1mV across this range, and temperature coefficient remains ≤50ppm/°C. Dynamic impedance stays below 0.5Ω, and noise remains at 20μVRMS - ensuring consistent 1.225V reference performance in industrial environments without derating.

Can TL4051BIDCKT replace TL4051BIDBZT in existing designs?

TL4051BIDCKT (SC-70) and TL4051BIDBZT (SOT-23-3) share identical electrical specifications but differ in package, pin count, and pinout. They are not pin-compatible: TL4051BIDCKT has 5 pins (including NC and dual Anode), while TL4051BIDBZT has 3 pins. PCB redesign is required to migrate; however, both deliver identical 1.225V, ±0.2%, 50ppm/°C performance in their respective footprints.