Texas Instruments TL4050C25QDCKT

Overview

TL4050C25QDCKT from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±0.5% initial tolerance and ±50 ppm/°C temperature coefficient over –40°C to 125°C. It operates from 60 μA to 15 mA cathode current, exhibits 41 μV_RMS wideband noise, and maintains stability with any capacitive load-enabling use in high-accuracy data acquisition and automotive power-supply monitoring.

For engineers reviewing the TL4050C25QDCKT datasheet, TL4050C25QDCKT pinout, TL4050C25QDCKT application, or TL4050C25QDCKT equivalent, key selection criteria include extended-temperature operation, low-noise performance, minimal bias current requirement, and SOT-23-3/SC-70 package compatibility for space-constrained PCB layouts.

Technical Context

The TL4050C25QDCKT functions as a two-terminal shunt reference, sinking cathode current to regulate voltage across its anode–cathode terminals. Its internal bandgap core achieves tight initial accuracy and low thermal drift without external compensation components.

Designed for direct integration into ADC/DAC reference paths and supply-monitoring circuits, it delivers stable 2.5 V output under varying load and supply conditions, with dynamic impedance of 0.3 Ω at 1 mA and thermal hysteresis of only 0.7 mV across –40°C to 125°C cycling.

Key Specifications

Pinout & Package

TL4050C25QDCKT is housed in the SC-70 (DCK) 3-pin surface-mount package, measuring 2.0 mm × 2.1 mm × 0.9 mm. Pin 1 is Anode, Pin 2 is Cathode, and Pin 3 is 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 TL4050C25QDCKT, REF3025AIDBZR offers improved initial accuracy for calibrated systems, while LM4040C25IDCKR trades tempco for lower unit cost in less demanding thermal environments-both retain SC-70/SOT-23 compatibility but differ in long-term stability and noise performance.

Availability

TL4050C25QDCKT is available at Aetrix Electronics and suitable for automotive electronics, precision data-acquisition systems, and battery-powered medical devices requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TL4050C25QDCKT 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 headquartered in Dallas, Texas, designing and manufacturing analog ICs, embedded processors, and digital signal processors for industrial, automotive, and consumer markets.

The TL4050 series belongs to TI's precision voltage reference product line, engineered specifically for high-accuracy, low-power shunt regulation in space-constrained and thermally aggressive applications-including automotive subsystems and portable instrumentation.

FAQ

What is the operating temperature range of the TL4050C25QDCKT?

The TL4050C25QDCKT is characterized for operation from –40°C to +125°C ambient temperature. This extended range is confirmed in Section 5.5 of the official TI datasheet (SLOS486B), where electrical characteristics are specified across the full –40°C to 125°C range for the Q-grade variant. The "Q" suffix explicitly denotes the automotive/extended-temperature qualification.

Does the TL4050C25QDCKT require an output capacitor for stability?

No, the TL4050C25QDCKT does not require an output capacitor for stability. As stated in Section 8.1 of the TI datasheet, it is designed to remain stable with all capacitive loads-including zero capacitance-and no external capacitor is needed. Adding one is optional and will not degrade performance, but introduces no benefit for basic regulation.

What is the minimum cathode current required for proper regulation of the TL4050C25QDCKT?

The TL4050C25QDCKT requires a minimum cathode current of 60 μA at 25°C, rising to 65 μA across the full –40°C to 125°C range, as specified in Table 5.5 (TL4050x25Q Electrical Characteristics). This value ensures the internal bandgap circuit remains active and maintains output regulation within tolerance.

How does the TL4050C25QDCKT compare to the TL4050C25IDCKT in terms of temperature rating?

The TL4050C25QDCKT is rated for –40°C to 125°C operation, whereas the TL4050C25IDCKT is rated only for –40°C to 85°C. The "Q" suffix indicates extended temperature qualification, making TL4050C25QDCKT suitable for under-hood automotive, industrial motor drives, and other high-ambient applications where the "I" grade would exceed its specification limits.

What is the reverse dynamic impedance of the TL4050C25QDCKT and why does it matter?

The reverse dynamic impedance of the TL4050C25QDCKT is 0.3 Ω at 1 mA cathode current and 120 Hz, per Table 5.5. This low impedance determines how much the output voltage shifts under changing load current-e.g., a 1 mA step change causes only 0.3 mV deviation, ensuring stable reference performance in dynamic analog signal chains.