Texas Instruments TL4050B25QDBZR

Overview

TL4050B25QDBZR from Texas Instruments is a precision 2.5V shunt voltage reference in SOT-23-3 package, rated for –40°C to 125°C operation, with ±0.2% initial tolerance, 50ppm/°C temperature coefficient, 41μVRMS wideband noise, and stable operation down to 60μA cathode current. It serves as a stable reference in high-accuracy ADC/DAC biasing, automotive sensor signal conditioning, and industrial power-supply monitoring circuits.

For engineers reviewing the TL4050B25QDBZR datasheet, TL4050B25QDBZR pinout, TL4050B25QDBZR application, or TL4050B25QDBZR equivalent, this page delivers verified electrical characteristics, thermal performance limits, load-current design boundaries, and direct alternatives for extended-temperature shunt reference selection.

Technical Context

The TL4050B25QDBZR operates as a two-terminal shunt reference requiring only an external series resistor to regulate cathode current between 60μA (min) and 15mA (max). Its internal bandgap core delivers fixed 2.5V reverse breakdown voltage with low dynamic impedance (0.3Ω at 1mA), enabling stable output under varying load and supply conditions across its full –40°C to 125°C range.

No output capacitor is required for stability - the device remains unconditionally stable with all capacitive loads. Thermal hysteresis is limited to 0.7mV after cycling between –40°C and 125°C, and long-term stability is 120ppm over 1000 hours at 25°C.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with gull-wing leads, 1.0mm pitch, 2.92mm × 1.3mm footprint, and 1.45mm height - optimized for space-constrained PCB layouts in automotive ECUs and portable test equipment.

Key Features

Applications

Equivalent & Alternatives

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

Compared with LM4040B25IDBZR and REF3025AIDBZR, TL4050B25QDBZR uniquely combines ultra-low noise, micropower shunt operation, and zero-output-capacitor stability - making it the optimal choice for space- and power-constrained high-accuracy analog systems requiring extended temperature resilience.

Availability

TL4050B25QDBZR is available at Aetrix Electronics and suitable for automotive sensor modules, industrial power-monitoring systems, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050B25QDBZR 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 delivering analog and embedded processing solutions, with leadership in precision analog ICs and automotive-grade components.

The TL4050 series was designed specifically for high-accuracy, low-power shunt reference applications in harsh environments - targeting automotive, industrial, and portable instrumentation markets where reliability and parametric consistency are critical.

FAQ

What is the maximum cathode current rating for TL4050B25QDBZR?

The absolute maximum cathode current for TL4050B25QDBZR is 20mA, but the recommended operating limit is 15mA per the datasheet's Recommended Operating Conditions. Exceeding 15mA risks exceeding the 150°C junction temperature limit under typical PCB thermal conditions, potentially degrading long-term stability or causing thermal shutdown in enclosed assemblies. Always verify power dissipation (P = V_Z × I_Z) and board-level thermal resistance when operating near 15mA.

Does TL4050B25QDBZR require an output capacitor for stability?

No, TL4050B25QDBZR does not require an output capacitor for stability - it is unconditionally stable with all capacitive loads, including 0μF. This eliminates BOM cost and PCB area typically needed for bypass capacitors in shunt references. However, if added for noise filtering (e.g., in sensitive audio applications), the device remains stable regardless of capacitance value or ESR, per TI's characterization in Section 8.1.

What is the minimum cathode current needed for TL4050B25QDBZR to maintain regulation?

The minimum cathode current for TL4050B25QDBZR is 60μA (typical) at 25°C, with a maximum of 65μA across the full –40°C to 125°C range. Below this threshold, the device exits regulation and output voltage drops nonlinearly. Designers must size the series resistor (R_S) to guarantee ≥65μA cathode current even under worst-case conditions: lowest supply voltage, highest load current, and coldest temperature.

How does TL4050B25QDBZR differ from the industrial-grade TL4050B25IDBZR?

TL4050B25QDBZR is qualified for –40°C to 125°C operation, while TL4050B25IDBZR is rated only to 85°C. Both share identical electrical specs (±0.2% tolerance, 50ppm/°C, 41μV_RMS noise), but the Q-grade undergoes extended-temperature screening and burn-in. The Q variant is mandatory for under-hood automotive, motor drives, and industrial controls where ambient exceeds 85°C - the I-grade may drift or fail outside its specified range.

Can TL4050B25QDBZR be used as a replacement for TL4050A25QDBZR in a design?

Yes, TL4050B25QDBZR can replace TL4050A25QDBZR in most applications, but with a trade-off: the B-grade has ±0.2% initial tolerance versus A-grade's ±0.1%. If the system requires ≤0.1% reference accuracy (e.g., metrology-grade calibration), TL4050A25QDBZR must be retained. Otherwise, TL4050B25QDBZR offers identical thermal performance, noise, and micropower behavior at lower cost - confirmed by TI's ordering table and parametric equivalence in Sections 5.4 and 5.5.