Texas Instruments TL4050C50IDBZR

Overview

TL4050C50IDBZR from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 5.0V output with ±0.5% initial tolerance (max), 50ppm/°C temperature coefficient, 93μVRMS wideband noise, 0.5Ω dynamic impedance, and stable operation from 56μA to 15mA cathode current - used in high-resolution ADC biasing and portable power-supply monitoring.

For engineers reviewing the TL4050C50IDBZR datasheet, TL4050C50IDBZR pinout, TL4050C50IDBZR application, or TL4050C50IDBZR equivalent, this page delivers verified electrical specs, SOT-23-3 terminal mapping, real-world use cases in data acquisition and battery-powered instrumentation, and validated alternative options for cost-performance trade-offs.

Technical Context

The TL4050C50IDBZR operates as a two-terminal shunt reference requiring no external capacitor for stability and maintaining regulation across capacitive loads up to 10μF. Its bandgap-based core achieves low thermal hysteresis (1.4mV) and long-term stability (120ppm/1000h) under continuous 100μA bias at 25°C.

Designed for industrial temperature range (–40°C to +85°C), it supports cathode current from 56μA (min) to 15mA (max) while holding output voltage drift within ±42mV over full temperature and load conditions - enabling direct replacement of legacy references in space-constrained analog front-ends.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with 1.4mm × 2.9mm footprint, 1.1mm height, and thermal resistance θ_JA = 206°C/W - optimized for PCB area-constrained designs and reflow-compatible assembly.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C50IDBZR, LM4040C50IDBZR trades precision for lower cost in benign environments, while REF3050AIDBZR offers tighter initial accuracy but demands series topology changes and extra components - making TL4050C50IDBZR optimal for drop-in shunt upgrades in space- and power-constrained designs.

Availability

TL4050C50IDBZR is available at Aetrix Electronics and suitable for industrial process monitoring, portable data loggers, and automotive cabin control systems requiring stable component supply with guaranteed long-term sourcing.

Supply support for TL4050C50IDBZR 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 ICs, embedded processors, and high-reliability power management solutions for industrial, automotive, and communications markets.

The TL4050 series belongs to TI's precision voltage reference product line, engineered specifically for micropower, low-noise, and capacitor-free operation in portable and high-accuracy measurement systems.

FAQ

What is the minimum cathode current required for TL4050C50IDBZR to regulate properly?

The TL4050C50IDBZR requires a minimum cathode current of 56μA at 25°C (80μA over full –40°C to +85°C range) to maintain regulation. Below this threshold, output voltage deviates beyond specification; design must ensure external bias resistor supplies ≥56μA even under worst-case supply and load conditions. This value is confirmed in Section 5.8 of the TL4050 datasheet for the C-grade 5V industrial variant.

Does TL4050C50IDBZR require an output capacitor for stability?

No, TL4050C50IDBZR does not require an output capacitor for stability. It is explicitly designed to remain stable with all capacitive loads from 0 to 10μF, including direct connection to ADC reference inputs or op-amp feedback nodes. This eliminates BOM cost and PCB area typically needed for bypass capacitors in shunt reference designs.

What is the thermal hysteresis specification for TL4050C50IDBZR?

The thermal hysteresis of TL4050C50IDBZR is 1.4mV, defined as the difference between its 25°C output voltage after cycling to –40°C versus after cycling to +125°C. This parameter is measured per JEDEC JESD22-A103 and directly impacts repeatability in systems undergoing repeated thermal cycles, such as automotive ECUs or outdoor instrumentation.

Can TL4050C50IDBZR be used in place of TL4050B50IDBZR?

Yes, TL4050C50IDBZR can replace TL4050B50IDBZR electrically and physically (same SOT-23-3 package), but with relaxed initial accuracy: ±0.5% vs. ±0.2%. System-level validation is required where 0.3% additional tolerance affects measurement uncertainty - e.g., in 14-bit+ data acquisition. No PCB or schematic changes are needed for substitution.

What is the maximum cathode current rating for TL4050C50IDBZR?

The absolute maximum cathode current for TL4050C50IDBZR is 15mA, as specified in Section 5.1 Absolute Maximum Ratings. Exceeding this limit risks permanent damage. For reliable operation, cathode current should remain ≤15mA under all conditions - including worst-case combinations of minimum load and maximum input voltage in shunt regulator configurations.