Texas Instruments TL4050B50QDCKT

Overview

TL4050B50QDCKT from Texas Instruments is a precision micropower shunt voltage reference with 5.0V nominal output, ±0.2% initial tolerance (B grade), 50ppm/°C max temperature coefficient, 93μVRMS wideband noise, and operation across –40°C to 125°C. It serves as a stable, low-noise reference in high-accuracy analog signal chains, particularly where space-constrained SOT-23-3 packaging and extended temperature reliability are required.

For engineers reviewing the TL4050B50QDCKT datasheet, TL4050B50QDCKT pinout, TL4050B50QDCKT application, or TL4050B50QDCKT equivalent, key selection criteria include its guaranteed 5.0V output stability over full industrial-to-automotive temperature range, cathode current operating window (74μA to 15mA), low dynamic impedance (0.5Ω), and compatibility with all capacitive loads without external compensation.

Technical Context

The TL4050B50QDCKT implements a two-terminal shunt topology requiring only an external series resistor to regulate voltage against varying supply and load conditions. Its internal bandgap core delivers fixed 5.0V reverse breakdown with thermal hysteresis of 1.4mV after cycling between –40°C and 125°C.

It operates with cathode current from 74μA (min, full temp range) to 15mA (max), maintaining output voltage change ≤12mV across that range. Dynamic impedance remains ≤0.5Ω at 1mA/120Hz, enabling stable performance in ADC/DAC reference and precision power-supply monitor applications despite load transients.

Key Specifications

Pinout & Package

TL4050B50QDCKT is housed in a SC-70 (DCK) 3-pin surface-mount package measuring 2.0mm × 2.1mm × 0.9mm. Pin 1 is Anode, Pin 2 is Cathode, Pin 3 is NC (no internal connection; must be left floating or tied to Pin 2 per TI design guidance).

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF3050AIDBZR and ADR3450ARJZ-R7, TL4050B50QDCKT offers verified 125°C operation with documented long-term stability (120ppm/1000h), lower system cost via simplified external circuitry (no output cap needed), and broader volume availability for high-reliability embedded programs.

Availability

TL4050B50QDCKT is available at Aetrix Electronics and suitable for industrial process monitoring, automotive battery management, portable medical instrumentation, and energy meter reference subsystems requiring stable component supply across extended temperature ranges and multi-year production cycles.

Supply support for TL4050B50QDCKT 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, power management, and industrial interface solutions.

The TL4050 series was designed specifically for high-accuracy, low-power shunt reference applications in harsh-environment systems - emphasizing robustness, minimal external components, and guaranteed performance across automotive and industrial temperature grades.

FAQ

What is the minimum cathode current required for TL4050B50QDCKT to maintain regulation across its full temperature range?

The TL4050B50QDCKT requires a minimum cathode current of 90μA over the full –40°C to 125°C operating range, as specified in Section 5.9 of the datasheet. At 25°C, typical minimum current is 74μA, but design must accommodate the worst-case 90μA to ensure stable 5.0V output under extreme cold or hot conditions. This value directly determines the maximum allowable series resistor (RS) in shunt regulator configurations.

Does TL4050B50QDCKT require an output capacitor for stability?

No, TL4050B50QDCKT does not require an output capacitor for stability. As confirmed in Section 8.1 and Feature list, it is inherently stable with all capacitive loads - including zero capacitance - eliminating the need for external bypass components. Adding a capacitor is optional and only used for additional noise filtering, not for loop compensation.

How does the thermal hysteresis of TL4050B50QDCKT affect system accuracy after temperature cycling?

TL4050B50QDCKT exhibits 1.4mV thermal hysteresis (ΔVZ between –40°C and 125°C cycling), equivalent to ±0.028% of its 5.0V output. This shift occurs once per thermal cycle and remains stable thereafter. For systems undergoing infrequent ambient shifts (e.g., outdoor meters), this introduces a fixed offset that can be calibrated out; for rapidly cycled environments, it contributes to repeatability error in high-precision measurements.

Can TL4050B50QDCKT be used as a direct replacement for TL4050B50IDCKT in existing designs?

Yes, TL4050B50QDCKT is a direct drop-in replacement for TL4050B50IDCKT in terms of pinout, electrical behavior, and SC-70 package dimensions. The only difference is extended temperature qualification: TL4050B50QDCKT is rated for –40°C to 125°C versus –40°C to 85°C for the 'I' version. No layout or schematic changes are needed - only qualification testing under elevated temperature conditions is recommended for new deployments.

What is the long-term stability specification for TL4050B50QDCKT, and how is it measured?

TL4050B50QDCKT has a long-term stability of 120ppm after 1000 hours of operation at 25°C ±0.1°C with 100μA cathode current, as defined in Sections 5.4–5.11. This metric reflects parametric drift due to silicon aging and is measured under controlled lab conditions - not accelerated life testing. It translates to ±0.6mV drift on the 5.0V output, supporting calibration intervals up to 10 years in stable environments.