Texas Instruments TL4050B25IDCKR

Overview

TL4050B25IDCKR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±0.2% initial tolerance (max), 50 ppm/°C temperature coefficient (max), 41 μVRMS wideband noise, and stable operation from 60 μA to 15 mA cathode current. It serves as a low-drift, low-noise reference in high-resolution ADC/DAC biasing, portable power-supply monitoring, and battery-powered instrumentation.

For engineers reviewing the TL4050B25IDCKR datasheet, TL4050B25IDCKR pinout, TL4050B25IDCKR application, or TL4050B25IDCKR equivalent, this page provides verified electrical specifications, SC-70 package details, functional pin roles, real-world use cases in data acquisition and energy management, and validated alternative options for design flexibility.

Technical Context

The TL4050B25IDCKR operates as a two-terminal shunt reference requiring no external output capacitor and remaining stable across all capacitive loads. Its core function relies on reverse-biased Zener-like breakdown with low dynamic impedance (0.3 Ω at 1 mA) and tightly controlled thermal hysteresis (0.7 mV).

It is characterized over –40°C to 85°C (industrial grade), supports cathode currents from 60 μA minimum to 15 mA maximum, and achieves long-term stability of 120 ppm after 1000 hours - enabling reliable performance in embedded sensing and precision analog signal chains without trimming or calibration.

Key Specifications

Pinout & Package

TL4050B25IDCKR is housed in a 3-pin SC-70 (DCK) package - footprint-compatible with SOT-23 but smaller (2.0 mm × 1.25 mm × 0.9 mm), optimized for space-constrained portable designs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050A25IDCKR, the TL4050B25IDCKR trades 0.1% initial accuracy for lower cost and broader availability, while REF3025AIDBZR introduces topology constraints (series vs. shunt) that limit replacement flexibility in existing shunt-regulator designs.

Availability

TL4050B25IDCKR is available at Aetrix Electronics and suitable for data-acquisition systems, industrial power-supply monitors, and battery-powered instrumentation requiring stable component supply, consistent parametric performance, and long-lifecycle sourcing assurance.

Supply support for TL4050B25IDCKR 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 voltage references and power management ICs.

The TL4050 series was designed specifically for cost-sensitive, space-constrained applications demanding micropower operation, zero-output-capacitor stability, and industrial-grade temperature performance - targeting portable instrumentation, sensor interfaces, and energy-efficient control systems.

FAQ

What is the operating temperature range for TL4050B25IDCKR?

The TL4050B25IDCKR is specified for industrial temperature operation from –40°C to +85°C. This range is confirmed in Section 5.4 (TL4050x25I Electrical Characteristics) of the official TI datasheet SLOS486B, and applies to all B-grade variants in SC-70 packaging. It does not support the extended –40°C to +125°C range offered by Q-grade versions like TL4050B25QDCKR.

Does TL4050B25IDCKR require an output capacitor?

No, TL4050B25IDCKR does not require an output capacitor for stability. As stated in Section 8.1 and Section 3 of the TI datasheet, it is designed to remain stable with all capacitive loads - including zero capacitance - eliminating the need for external bypass components and reducing BOM count and PCB area.

What is the minimum cathode current needed for TL4050B25IDCKR to regulate properly?

The TL4050B25IDCKR requires a minimum cathode current of 60 μA (typical) and 65 μA (max over temperature) to maintain regulation within specification. This value is explicitly listed in Table 5.4 under "IZ,min" for TL4050B25I, and defines the lower bound of its 60 μA–15 mA operating range.

How does TL4050B25IDCKR differ from TL4050B25IDBZR?

TL4050B25IDCKR uses the SC-70 (DCK) package (2.0 mm × 1.25 mm), while TL4050B25IDBZR uses the larger SOT-23-3 (DBZ) package (2.92 mm × 1.3 mm). Both share identical electrical specs, grade (B), voltage (2.5 V), and temperature range (–40°C to 85°C), but differ in footprint, thermal resistance (252°C/W vs. 206°C/W), and tape-and-reel packaging dimensions.

Can TL4050B25IDCKR be used in place of a bandgap reference?

TL4050B25IDCKR is a Zener-based shunt reference, not a bandgap reference. While both provide stable voltage, TL4050B25IDCKR offers lower noise (41 μVRMS) and better tempco (50 ppm/°C) than many legacy bandgaps, but requires external current-setting resistor and operates only in shunt mode - limiting use to applications where load current flows *away* from the reference node.