Texas Instruments TL4050B25QDCKT

Overview

TL4050B25QDCKT from Texas Instruments is a precision micropower shunt voltage reference delivering a stable 2.5 V output with ±0.2% initial tolerance (max), ±50 ppm/°C temperature coefficient, 41 μV_RMS wideband noise, and operation across –40°C to 125°C. It serves as the voltage reference in high-resolution ADCs, battery-powered instrumentation, and automotive power-supply monitors where low drift and minimal quiescent current are critical.

For engineers reviewing the TL4050B25QDCKT datasheet, TL4050B25QDCKT pinout, TL4050B25QDCKT application, or TL4050B25QDCKT equivalent, key selection criteria include guaranteed extended-temperature performance, cathode current range (60 μA to 15 mA), dynamic impedance (0.3 Ω), thermal hysteresis (0.7 mV), and SC-70 package compatibility with space-constrained PCB layouts.

Technical Context

The TL4050B25QDCKT operates as a two-terminal shunt reference requiring no external capacitor for stability and maintaining regulation across all capacitive loads. Its internal bandgap core achieves tight initial accuracy and low temperature drift via curvature-compensated design.

It functions within a cathode current range of 60 μA (typ) to 15 mA, exhibits 0.3 Ω dynamic impedance at 1 mA, and delivers 41 μV_RMS noise over 10 Hz–10 kHz - enabling use in 16-bit data-acquisition systems without additional filtering.

Key Specifications

Pinout & Package

TL4050B25QDCKT is housed in a 3-pin SC-70 (DCK) package - a 2.0 mm × 2.1 mm surface-mount outline with 0.65 mm pitch - optimized for high-density portable and automotive PCBs.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3025AIDBZR and ADR3425ARJZ-R7, TL4050B25QDCKT offers the optimal balance of extended-temperature operation, 50 ppm/°C drift, 60 μA minimum current, and SC-70 footprint - making it preferred for cost-sensitive automotive and industrial embedded systems requiring robustness without premium specs.

Availability

TL4050B25QDCKT is available at Aetrix Electronics and suitable for automotive power-supply monitors, precision portable instrumentation, and energy management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050B25QDCKT 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, embedded processing, and connectivity technologies, with decades of expertise in precision analog ICs and automotive-qualified components.

The TL4050 series belongs to TI's precision voltage reference product line, engineered specifically for high-accuracy, low-power, and extended-temperature applications in data acquisition, industrial control, and automotive electronics.

FAQ

What is the maximum cathode current rating for TL4050B25QDCKT?

The absolute maximum cathode current for TL4050B25QDCKT is 15 mA, as specified in the Absolute Maximum Ratings table. Operating continuously above this level risks exceeding the device's thermal limits and may cause permanent degradation. The recommended operating condition specifies a maximum cathode current of 15 mA, aligning with its 0.3 Ω dynamic impedance and 252 °C/W thermal resistance in the SC-70 package. Always verify power dissipation (P = V_Z × I_Z) stays within safe junction temperature limits for your board layout.

Does TL4050B25QDCKT require an output capacitor for stability?

No, TL4050B25QDCKT does not require an output capacitor for stability. Its internal design ensures unconditional stability with all capacitive loads, including direct connection to ADC reference inputs or large bulk capacitance. This eliminates the need for external bypass components, simplifying layout and reducing bill-of-materials cost. However, if noise filtering is required beyond the inherent 41 μV_RMS, a small ceramic capacitor (e.g., 100 nF) may be added without compromising stability - as confirmed in Section 8.1 of the TL4050 datasheet.

What is the thermal hysteresis specification for TL4050B25QDCKT?

The thermal hysteresis of TL4050B25QDCKT is 0.7 mV, defined as the difference in measured 2.5 V output at 25°C after cycling the device from –40°C versus after cycling from 125°C. This parameter reflects mechanical stress memory in the silicon and packaging, directly impacting repeatability in systems undergoing repeated thermal cycles - such as automotive ECUs or outdoor energy meters. The value is consistent across all grades (A/B/C) and temperature versions (I/Q) of the 2.5 V TL4050 family.

Can TL4050B25QDCKT be used in place of TL4050B25IDCKT?

Yes, TL4050B25QDCKT can replace TL4050B25IDCKT in designs requiring operation beyond 85°C ambient, as both share identical electrical specifications (2.5 V, ±0.2% tolerance, 50 ppm/°C, SC-70 package), but TL4050B25QDCKT is characterized for –40°C to 125°C while TL4050B25IDCKT is limited to –40°C to 85°C. No PCB changes are needed - same pinout, footprint, and marking (86_). However, verify thermal margin in the target application, since the Q-grade's extended range does not imply improved thermal resistance.

What is the long-term stability of TL4050B25QDCKT after 1000 hours?

The long-term stability of TL4050B25QDCKT is 120 ppm after 1000 hours of operation at 25°C ± 0.1°C with 100 μA cathode current, as specified in Section 5.5 of the datasheet. This represents the maximum observed drift in output voltage due to silicon aging mechanisms under controlled conditions. In real-world applications, actual drift may vary based on operating temperature, current stress, and PCB thermal environment - but the 120 ppm figure provides a validated upper bound for reliability modeling and calibration interval planning in safety-critical or metrology-grade systems.