Texas Instruments TL4050A25IDCKR

Overview

TL4050A25IDCKR from Texas Instruments is a precision 2.5V micropower shunt voltage reference in SC-70-3 package, featuring ±0.1% initial tolerance, 50ppm/°C max temperature coefficient, 41μVRMS wideband noise, 60μA typical minimum cathode current, and stable operation across –40°C to 85°C ambient. It serves as a low-drift, low-noise reference in high-resolution ADCs, portable power monitors, and battery-powered instrumentation.

For engineers reviewing the TL4050A25IDCKR datasheet, TL4050A25IDCKR pinout, TL4050A25IDCKR application, or TL4050A25IDCKR equivalent, this page delivers verified specifications, validated pin functions, real-world use cases in data acquisition and energy management, and two confirmed alternative parts with documented technical and application differences.

Technical Context

The TL4050A25IDCKR operates as a two-terminal shunt reference requiring no external output capacitor and maintaining regulation across 60μA–15mA cathode current. Its internal bandgap core delivers fixed 2.5V reverse breakdown voltage with low dynamic impedance (0.3Ω at 1mA) and thermal hysteresis of 0.7mV over –40°C to 125°C cycling.

Designed for industrial temperature range (–40°C to 85°C), it achieves ±20ppm/°C typical tempco at 1mA bias and supports stable operation with all capacitive loads-enabling direct integration into compact, low-power signal chains without stability compensation.

Key Specifications

Pinout & Package

TL4050A25IDCKR uses the SC-70-3 (DCK) package: 1.25mm × 2.1mm footprint, 0.65mm pitch, 0.9mm max height. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC (no internal connection; must be left floating or tied to Pin 2 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 TL4050A25IDCKR, REF3025AIDBZR trades 0.1% accuracy and 9μV noise headroom for lower cost and identical SC-70 compatibility, while ADR3425ARJZ-R7 delivers 5× better tempco and 5× lower noise at the expense of higher current and non-pin-compatible packaging.

Availability

TL4050A25IDCKR 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 sourcing.

Supply support for TL4050A25IDCKR 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 delivering analog ICs, embedded processors, and system solutions for industrial, automotive, and personal electronics markets.

The TL4050 series targets precision analog signal chains in resource-constrained environments, emphasizing micropower operation, zero-capacitor stability, and industrial-temperature reliability without sacrificing accuracy.

FAQ

What is the operating temperature range for TL4050A25IDCKR?

The TL4050A25IDCKR is specified for industrial temperature operation from –40°C to +85°C ambient. This range is explicitly defined in the "Recommended Operating Conditions" section of the datasheet and applies to all electrical characteristics in the TL4050A25I family-including the DCK package variant TL4050A25IDCKR. It is not rated for extended temperature (–40°C to 125°C) operation; that capability belongs to the TL4050A25Q variants.

Does TL4050A25IDCKR require an output capacitor?

No, TL4050A25IDCKR does not require an output capacitor for stability. As confirmed in Section 8.1 of the datasheet, the device is designed to remain stable with all capacitive loads-including zero capacitance-and adding a capacitor is optional for noise filtering only. This eliminates BOM cost and PCB area in space-limited applications like handheld instruments and sensor nodes.

What is the minimum cathode current needed for TL4050A25IDCKR to regulate properly?

The TL4050A25IDCKR requires a minimum cathode current of 60μA typical (65μA maximum over temperature) to maintain regulation. This value is specified in Table 5.4 ("TL4050x25I Electrical Characteristics") under IZ,min at 25°C and full range. Below this current, the output voltage deviates significantly from 2.5V, compromising accuracy in low-power sleep modes.

How does the SC-70-3 package of TL4050A25IDCKR affect thermal performance?

The SC-70-3 (DCK) package has a thermal impedance (θJA) of 252°C/W, as stated in Section 5.1 Absolute Maximum Ratings. This is higher than the SOT-23-3 (DBZ) variant (206°C/W), meaning TL4050A25IDCKR dissipates heat less efficiently. At 15mA cathode current and 2.5V drop, power dissipation reaches 37.5mW-resulting in ~9.4°C junction rise above ambient. Layout must include adequate copper pour to manage thermal rise in continuous-use applications.

Can TL4050A25IDCKR be used as a replacement for TL4050A25IDBZR?

Yes, TL4050A25IDCKR and TL4050A25IDBZR share identical electrical specifications (2.5V, ±0.1%, 50ppm/°C, –40°C to 85°C), but differ only in package: DCK = SC-70-3, DBZ = SOT-23-3. Pinout is identical (Cathode-Anode-NC), and both are drop-in replacements electrically. However, SC-70-3 has smaller footprint and higher θJA-so thermal validation is required if substituting in thermally constrained layouts.