Texas Instruments TL4050C25QDBZR

Overview

TL4050C25QDBZR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±13 mV (±0.5%) initial tolerance at 25°C and ±25 mV (±1.0%) over –40°C to 125°C, 41 μVRMS wideband noise, 0.3 Ω dynamic impedance, and stable operation from 65 μA to 15 mA cathode current. It serves as a low-drift, low-noise reference in high-resolution ADCs and battery-powered instrumentation.

For engineers reviewing the TL4050C25QDBZR datasheet, TL4050C25QDBZR pinout, TL4050C25QDBZR application, or TL4050C25QDBZR equivalent, key selection criteria include extended-temperature operation (–40°C to 125°C), C-grade accuracy, SOT-23-3 package compatibility, and shunt topology design requirements including external current-setting resistor calculation and cathode/anode terminal roles.

Technical Context

The TL4050C25QDBZR operates as a two-terminal shunt reference requiring no output capacitor and remaining stable with all capacitive loads. Its internal bandgap core achieves 50 ppm/°C max temperature coefficient across the full operating range, with thermal hysteresis limited to 0.7 mV after cycling between –40°C and 125°C.

It functions within a cathode current range of 65 μA (min, full temp range) to 15 mA (max), exhibiting reverse dynamic impedance of 0.3 Ω at 1 mA and 120 Hz, and long-term stability of 120 ppm after 1000 hours at 25°C. The device's low 41 μVRMS noise (10 Hz–10 kHz) supports 16-bit+ data acquisition systems.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with standard pinout: Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC (no internal connection; must be left floating or tied to Pin 2 per TI guidance due to parasitic Schottky diode).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3025AIDBZR and LM4040C25IDBZR, TL4050C25QDBZR delivers identical 125°C qualification and C-grade cost, but provides superior temperature stability (±50 ppm/°C vs. ±100 ppm/°C) and lower noise (41 vs. 45 μVRMS), making it optimal for high-accuracy, extended-temperature shunt reference designs.

Availability

TL4050C25QDBZR is available at Aetrix Electronics and suitable for data-acquisition systems, automotive electronics, and battery-powered equipment requiring stable component supply with guaranteed 125°C operation and long-term calibration integrity.

Supply support for TL4050C25QDBZR 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 TL4050 series was designed specifically for cost-sensitive, micropower shunt reference applications demanding extended temperature range, low noise, and zero-output-capacitor stability - targeting instrumentation, automotive sensors, and portable measurement systems.

FAQ

What is the maximum operating temperature for TL4050C25QDBZR?

The TL4050C25QDBZR is characterized for operation from –40°C to +125°C ambient temperature, with electrical specifications guaranteed across this full extended temperature range. This makes TL4050C25QDBZR suitable for under-hood automotive and industrial control applications where ambient temperatures exceed 105°C.

Does TL4050C25QDBZR require an output capacitor?

No, TL4050C25QDBZR does not require an output capacitor for stability. It is explicitly designed to remain stable with all capacitive loads, eliminating the need for external bypass capacitance. Adding a capacitor is optional and may be used solely for additional noise filtering, not for loop compensation.

What is the minimum cathode current needed for TL4050C25QDBZR to regulate properly?

The minimum cathode current for TL4050C25QDBZR is 65 μA over the full –40°C to 125°C temperature range. At 25°C, the typical minimum is 60 μA. This value determines the largest allowable external series resistor in shunt regulator configurations and directly impacts system quiescent power.

How does the noise performance of TL4050C25QDBZR affect ADC resolution?

With 41 μVRMS wideband noise (10 Hz–10 kHz), TL4050C25QDBZR contributes approximately 1.3 LSB of noise to a 2.5 V full-scale, 16-bit ADC (LSB = 38.1 μV). This enables effective resolution beyond 16 bits in low-frequency, low-noise signal chains when combined with proper layout and filtering.

Can TL4050C25QDBZR be used in place of TL4050C25IDBZR?

Yes, TL4050C25QDBZR can replace TL4050C25IDBZR in designs requiring operation above 85°C ambient, as it extends the temperature range from –40°C to 125°C versus –40°C to 85°C. Electrical parameters are otherwise identical; both share the same 2.5 V output, ±0.5% tolerance, SOT-23-3 package, and pinout.