Texas Instruments TL4050A50QDBZRQ1

Overview

TL4050A50QDBZRQ1 from Texas Instruments is an AEC-Q100 Grade 1 qualified precision micropower shunt voltage reference delivering a fixed 5.0 V output with ±0.1% initial tolerance, 50 ppm/°C temperature coefficient, and 93 μV_RMS wideband noise over –40°C to +125°C. It operates from 60 μA to 15 mA cathode current, requires no output capacitor, and serves as a stable reference in automotive power-supply monitors and high-resolution data-acquisition systems.

For engineers reviewing the TL4050A50QDBZRQ1 datasheet, TL4050A50QDBZRQ1 pinout, TL4050A50QDBZRQ1 application, or TL4050A50QDBZRQ1 equivalent, key selection criteria include its Grade A tolerance, SOT-23-3 package compatibility with space-constrained automotive PCBs, low-noise performance at 100 μA bias, and guaranteed operation across full automotive temperature range without external stabilization components.

Technical Context

The TL4050A50QDBZRQ1 functions as a two-terminal shunt reference, sinking cathode current to maintain a precise 5.0 V reverse breakdown voltage. Its internal bandgap core achieves ±0.1% accuracy at 25°C and maintains stability via low dynamic impedance (0.5 Ω at 1 mA) and thermal hysteresis of only 1.4 mV after –40°C/125°C cycling.

Designed for automotive environments, it features ESD ratings of ±2000 V HBM and ±500 V CDM, operates with all capacitive loads, and exhibits minimal voltage drift (±50 ppm/°C) across its full –40°C to +125°C operating range while drawing as little as 56 μA minimum cathode current.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ), 1.12 mm max height, JEDEC TO-236 compliant, with gull-wing leads and pin 1 quadrant Q3 orientation on tape-and-reel.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3050AIDBZR and MAX6050AEUR+T, TL4050A50QDBZRQ1 uniquely combines AEC-Q100 Grade 1 qualification, ±0.1% tolerance, and 5.0 V output in SOT-23-3-making it the only drop-in solution for safety-critical 125°C ambient applications like battery management and powertrain control.

Availability

TL4050A50QDBZRQ1 is available at Aetrix Electronics and suitable for automotive power-supply monitors, high-resolution data-acquisition systems, and energy management systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050A50QDBZRQ1 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 and embedded processing technologies, with decades of automotive-grade product development and manufacturing expertise.

The TL4050-Q1 family was engineered specifically for automotive subsystems demanding high accuracy, low power, and robustness across extreme temperatures-targeting power-supply supervision, sensor signal conditioning, and safety-critical data acquisition.

FAQ

What is the maximum cathode current rating for TL4050A50QDBZRQ1?

The absolute maximum continuous cathode current for TL4050A50QDBZRQ1 is 20 mA, per its Absolute Maximum Ratings table. However, the recommended operating range is 56 μA to 15 mA to ensure specified electrical performance-including ±0.1% tolerance and ±50 ppm/°C temperature coefficient-over the full –40°C to +125°C temperature range. Exceeding 15 mA may degrade long-term stability.

Does TL4050A50QDBZRQ1 require an output capacitor for stability?

No, TL4050A50QDBZRQ1 does not require an output capacitor for stability. Its design is inherently stable with all capacitive loads, including 0 μF. This eliminates BOM cost and layout complexity. In high-noise automotive environments, a 0.1 μF ceramic capacitor between cathode and anode may be added to further suppress RF coupling-but it is never mandatory for loop stability.

How is pin 3 used in the SOT-23-3 package of TL4050A50QDBZRQ1?

In the SOT-23-3 (DBZ) package, pin 3 of TL4050A50QDBZRQ1 is internally connected to the anode and serves as an EMI guard terminal. TI recommends leaving it floating in low-noise applications, or connecting it directly to pin 2 (anode) in high-EMI environments-such as near DC-DC converters or motor drivers-to reduce susceptibility to radiated interference and improve reference voltage integrity.

What is the thermal hysteresis specification for TL4050A50QDBZRQ1?

The thermal hysteresis of TL4050A50QDBZRQ1 is 1.4 mV, defined as the difference between its 25°C output voltage measured after cycling to –40°C versus after cycling to +125°C. This low hysteresis ensures repeatable calibration points across thermal cycles in automotive ECUs, supporting reliable diagnostics and closed-loop control without recalibration.

Is TL4050A50QDBZRQ1 compatible with standard SOT-23-3 PCB footprints?

Yes, TL4050A50QDBZRQ1 uses the industry-standard SOT-23-3 footprint (JEDEC TO-236), matching IPC-7351 generic land pattern DBZ0003A. Its 0.95 mm pin pitch, 1.9 mm body width, and Q3 pin-1 quadrant orientation align with common automated assembly processes-enabling drop-in replacement without PCB redesign in existing automotive modules.