Texas Instruments TL4050C50QDBZRQ1

Overview

TL4050C50QDBZRQ1 from Texas Instruments is a precision AEC-Q100 Grade 1 (–40°C to +125°C) shunt voltage reference with fixed 5.0 V output, ±0.5% initial tolerance (max), 50 ppm/°C temperature coefficient, 93 μV_RMS wideband noise, and stable operation from 56 μA to 15 mA cathode current - used in automotive power-supply monitors and high-accuracy data-acquisition systems.

For engineers reviewing the TL4050C50QDBZRQ1 datasheet, TL4050C50QDBZRQ1 pinout, TL4050C50QDBZRQ1 application, or TL4050C50QDBZRQ1 equivalent, key selection criteria include guaranteed operation across –40°C to 125°C, no-output-capacitor stability, low dynamic impedance (0.5 Ω), thermal hysteresis ≤1.4 mV, and SOT-23-3 packaging for space-constrained automotive PCBs.

Technical Context

The TL4050C50QDBZRQ1 operates as a two-terminal shunt reference requiring only an external series resistor to regulate voltage across variable loads. Its bandgap-based core delivers stable 5.0 V output independent of supply variations, with reverse dynamic impedance of 0.5 Ω at 1 mA enabling tight regulation under dynamic load transients.

Designed for automotive-grade reliability, it features AEC-Q100 qualification, ESD ratings of ±2000 V HBM and ±500 V CDM, and thermal hysteresis of 1.4 mV after cycling between –40°C and 125°C - ensuring repeatable accuracy in engine control units and battery management systems where ambient temperature swings exceed 165°C.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with 1.12 mm max height, JEDEC TO-236 compatible, RoHS-compliant NiPdAu lead finish, MSL Level-1, and tape-and-reel packaging (3000 pcs/reel). Pin 1 = Anode, Pin 2 = Cathode, Pin 3 = NC (floating or tied to Pin 2 per EMI conditions).

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050B50QDBZRQ1, the TL4050C50QDBZRQ1 trades initial accuracy for lower cost in volume automotive applications where system-level calibration compensates for ±0.5% offset; versus REF3050AIDBZR, it provides mandatory AEC-Q100 compliance and guaranteed –40°C to 125°C operation - essential for under-hood deployment.

Availability

TL4050C50QDBZRQ1 is available at Aetrix Electronics and suitable for automotive electronics, battery-powered equipment, and precision instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050C50QDBZRQ1 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 automotive ICs, with decades of experience in high-reliability reference design.

The TL4050-Q1 product line delivers AEC-Q100-qualified shunt voltage references optimized for automotive subsystems demanding precision, low power, and robustness across extreme ambient temperatures.

FAQ

What is the operating temperature range of the TL4050C50QDBZRQ1?

The TL4050C50QDBZRQ1 is rated for operation from –40°C to +125°C ambient temperature, fully qualified to AEC-Q100 Grade 1 standards. This range is validated across all electrical parameters in the datasheet, including output voltage, temperature coefficient, and dynamic impedance - making TL4050C50QDBZRQ1 suitable for under-hood automotive applications such as engine control units and transmission control modules.

Does the TL4050C50QDBZRQ1 require an output capacitor for stability?

No, the TL4050C50QDBZRQ1 does not require an output capacitor for stability. It is designed to remain stable with all capacitive loads, including 0 μF. This eliminates the need for external bypass capacitors in space-constrained designs - a key advantage confirmed in Section 7.1 of the TL4050-Q1 datasheet and verified across the full –40°C to 125°C range. TL4050C50QDBZRQ1 maintains regulation integrity even when driving directly into ADC input capacitance or long PCB traces.

What is the minimum cathode current required for proper operation of the TL4050C50QDBZRQ1?

The TL4050C50QDBZRQ1 requires a minimum cathode current of 56 μA at 25°C and up to 90 μA across the full –40°C to 125°C range, as specified in Section 5.8 of the datasheet. This value ensures stable regulation and low-noise performance. Designers must size the series resistor (R_S) to guarantee this minimum current under worst-case conditions (e.g., lowest supply voltage and maximum load current). TL4050C50QDBZRQ1 remains functional down to this threshold without dropout or increased drift.

How does the TL4050C50QDBZRQ1 differ from the TL4050A50QDBZRQ1 and TL4050B50QDBZRQ1?

The TL4050C50QDBZRQ1 differs from TL4050A50QDBZRQ1 and TL4050B50QDBZRQ1 solely in initial output voltage tolerance: ±0.5% (C grade) vs. ±0.1% (A grade) and ±0.2% (B grade). All three share identical 5.0 V nominal output, ±50 ppm/°C temperature coefficient, 93 μV_RMS noise, SOT-23-3 package, and AEC-Q100 qualification. TL4050C50QDBZRQ1 targets cost-sensitive automotive applications where system-level calibration absorbs the wider tolerance band.

Is Pin 3 of the TL4050C50QDBZRQ1 internally connected, and how should it be handled?

Pin 3 of the TL4050C50QDBZRQ1 is a no-connect (NC) terminal with a parasitic Schottky diode to Pin 2 (Cathode). Per Section 7.2 of the datasheet, it must be left floating or connected to Pin 1 (Anode) - never driven independently. In high-EMI environments (e.g., near ignition coils or DC-DC converters), TI recommends tying Pin 3 to Pin 1 to suppress noise coupling. TL4050C50QDBZRQ1 functionality and specifications assume this configuration; misuse may cause leakage or instability.