Texas Instruments TL4050B50QDBZT

Overview

TL4050B50QDBZT from Texas Instruments is a precision micropower shunt voltage reference delivering a stable 5.0V output with ±0.2% initial tolerance and ±50ppm/°C temperature coefficient over –40°C to 125°C. It operates from 60μA to 15mA cathode current, exhibits 93μVRMS wideband noise, and maintains low dynamic impedance (0.5Ω) - enabling high-accuracy ADC/DAC biasing in automotive and industrial power-supply monitors.

For engineers reviewing the TL4050B50QDBZT datasheet, TL4050B50QDBZT pinout, TL4050B50QDBZT application, or TL4050B50QDBZT equivalent, key selection criteria include extended-temperature operation, no-output-capacitor stability, tight initial accuracy vs. micropower consumption trade-offs, and SOT-23-3 package compatibility with space-constrained PCB layouts.

Technical Context

The TL4050B50QDBZT functions as a two-terminal shunt reference, sinking cathode current to regulate voltage across its anode–cathode terminals. Its internal bandgap core achieves 5.0V nominal output with guaranteed performance across full –40°C to 125°C ambient range, validated per TL4050x50Q electrical characteristics tables.

It requires no external compensation and remains stable under all capacitive loads due to inherent low-output-impedance design (0.5Ω at 1mA, 120Hz). Thermal hysteresis is limited to 1.4mV after cycling between –40°C and 125°C, supporting repeatable precision in cyclic thermal environments.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ), 2.92mm × 1.3mm footprint, surface-mount, JEDEC MO-178 compatible. Pin 1 = Cathode, Pin 2 = Anode, Pin 3 = NC (no internal connection; must float or tie to Pin 2 per TI guidance).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3050AIDBZR and LM4040C50IDBZR, TL4050B50QDBZT delivers balanced performance: superior initial accuracy vs. LM4040C50IDBZR and better extended-temperature stability than REF3050AIDBZR, making it optimal for calibrated automotive and industrial systems requiring guaranteed –40°C to 125°C behavior.

Availability

TL4050B50QDBZT is available at Aetrix Electronics and suitable for automotive power-supply monitoring, industrial data-acquisition front-ends, and portable medical sensor nodes requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050B50QDBZT 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 automotive-grade components.

The TL4050 series belongs to TI's precision shunt voltage reference product line, designed specifically for high-accuracy, low-power, extended-temperature applications in automotive, industrial, and medical systems where stability and reliability are non-negotiable.

FAQ

What is the operating temperature range specified for TL4050B50QDBZT?

The TL4050B50QDBZT is characterized for operation across –40°C to 125°C ambient temperature, as confirmed in Section 5.9 (TL4050x50Q Electrical Characteristics) of the official TI datasheet. This extended temperature grade distinguishes it from industrial-grade variants (–40°C to 85°C) and qualifies it for under-hood automotive and harsh-environment industrial use cases. The device maintains all rated specifications-including ±0.2% initial tolerance and ±50ppm/°C tempco-within this full range.

Does TL4050B50QDBZT require an external output capacitor for stability?

No, TL4050B50QDBZT does not require an external output capacitor for stability. As stated in Section 8.1 and Feature List, it is inherently stable with all capacitive loads and needs no output bypass capacitor. This eliminates BOM cost and PCB area while simplifying layout-especially valuable in space-constrained portable and automotive applications. Adding a capacitor is optional and will not degrade performance.

What is the minimum cathode current needed for proper regulation of TL4050B50QDBZT?

The TL4050B50QDBZT requires a minimum cathode current of 60μA (typical) and 90μA (max over –40°C to 125°C) to maintain regulation, per Section 5.9. This value is higher than the industrial-grade TL4050B50IDBZT (80μA max) due to extended-temperature qualification. Designers must size the series bias resistor to guarantee ≥90μA under worst-case conditions (min supply, max load, cold temperature) to avoid reference dropout.

How does the noise performance of TL4050B50QDBZT compare to other 5V shunt references?

TL4050B50QDBZT delivers 93μVRMS wideband noise (10Hz–10kHz), as measured at 100μA cathode current. This is lower than LM4040C50IDBZR (120μVRMS) but higher than REF3050AIDBZR (42μVRMS). For 16-bit ADC applications requiring <1 LSB noise contribution at 5V full-scale, TL4050B50QDBZT supports ENOB >15.5 bits - sufficient for most industrial DAQ systems without added filtering, unlike noisier alternatives.

Is TL4050B50QDBZT pin-compatible with other TL4050 variants in SOT-23-3?

Yes, TL4050B50QDBZT uses the standard SOT-23-3 (DBZ) package with identical pinout (Pin 1=Cathode, Pin 2=Anode, Pin 3=NC) as all other TL4050x50x DBZ variants-including TL4050A50QDBZT and TL4050C50QDBZT. Mechanical compatibility is confirmed in TI's Package Drawing DBZ0003A. However, electrical differences (tolerance, tempco, min current) mean direct substitution requires validation of system-level accuracy and thermal drift requirements.