Texas Instruments TL4050C25QDBZT

Overview

TL4050C25QDBZT from Texas Instruments is a precision micropower shunt voltage reference delivering a fixed 2.5 V output with ±0.5% initial tolerance (max), ±50 ppm/°C temperature coefficient, 41 μV_RMS wideband noise, and stable operation from –40°C to 125°C. It functions as a two-terminal voltage reference in analog signal chains, ADC/DAC biasing, and power-supply monitoring circuits where low drift and minimal quiescent current are critical.

For engineers reviewing the TL4050C25QDBZT datasheet, TL4050C25QDBZT pinout, TL4050C25QDBZT application, or TL4050C25QDBZT equivalent, this page delivers verified electrical characteristics, SOT-23-3 terminal mapping, thermal hysteresis (0.7 mV), dynamic impedance (0.3 Ω), and validated alternatives for high-reliability industrial and automotive designs.

Technical Context

The TL4050C25QDBZT operates as a two-terminal shunt reference requiring no external capacitor for stability and supporting all capacitive loads. Its core architecture relies on bandgap-derived Zener-like breakdown with low dynamic impedance (0.3 Ω at 1 mA) and tightly controlled thermal hysteresis (0.7 mV over –40°C to 125°C cycling).

It maintains regulation across a cathode current range of 65 μA (min, full temp range) to 15 mA, with output voltage change ≤8 mV over 1–15 mA and ≤1.2 mV over 65 μA–1 mA - enabling precise biasing in low-power sensor interfaces and battery-operated instrumentation.

Key Specifications

Pinout & Package

SOT-23-3 package (DBZ) with 1.4 mm × 2.9 mm footprint and 1.1 mm height; optimized for space-constrained PCB layouts in portable and automotive modules.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TL4050C25QDBZT, REF3025AIDBZR offers tighter initial tolerance at the expense of higher minimum current and slightly higher noise, while LM4040C25IDBZR trades extended temperature capability for lower noise and lower cost - making TL4050C25QDBZT the optimal balance for automotive and wide-temperature industrial sensing.

Availability

TL4050C25QDBZT is available at Aetrix Electronics and suitable for industrial process monitoring, automotive battery management, and portable medical instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for TL4050C25QDBZT 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 connectivity technologies, with over 50 years of innovation in precision analog ICs.

The TL4050 series was designed specifically for high-stability, low-power shunt reference applications in harsh environments - targeting automotive, industrial, and energy infrastructure systems demanding extended temperature operation and long-term voltage accuracy.

FAQ

What is the maximum cathode current rating for TL4050C25QDBZT?

The absolute maximum cathode current for TL4050C25QDBZT is 20 mA, but the recommended operating limit is 15 mA to maintain specified performance and reliability. Exceeding 15 mA may increase self-heating beyond thermal design margins, potentially degrading long-term stability and accelerating parametric drift over time. Always verify power dissipation (P = V_Z × I_Z) remains within safe limits for the SOT-23-3 package's thermal resistance (206°C/W).

Does TL4050C25QDBZT require an output capacitor for stability?

No, TL4050C25QDBZT does not require an output capacitor for stability and is explicitly designed to remain stable with all capacitive loads - including 0 μF. This eliminates BOM cost and board space typically needed for bypass capacitors in shunt reference designs. Adding a capacitor (e.g., 100 nF) is permissible if desired for additional high-frequency noise filtering, but it provides no stability benefit and introduces no risk of oscillation.

What is the thermal hysteresis specification for TL4050C25QDBZT?

The thermal hysteresis of TL4050C25QDBZT is 0.7 mV, defined as the difference between the 25°C output voltage measured after cycling to –40°C versus after cycling to 125°C. This parameter directly impacts repeatability in field-deployed equipment subject to repeated thermal cycling, such as outdoor energy meters or automotive ECUs, ensuring consistent 2.5 V reference behavior across operational life.

Can TL4050C25QDBZT be used in place of TL4050C25IDBZT?

Yes, TL4050C25QDBZT can replace TL4050C25IDBZT in designs requiring operation beyond 85°C ambient, as both share identical electrical specifications (2.5 V, ±0.5%, ±50 ppm/°C, 41 μV_RMS) and SOT-23-3 packaging. The Q-grade extends the operating range from –40°C to 125°C versus the I-grade's –40°C to 85°C, making TL4050C25QDBZT suitable for under-hood automotive or high-temperature industrial applications where the I-grade would exceed its thermal limits.

What is the minimum cathode current required for TL4050C25QDBZT across its full temperature range?

The maximum minimum cathode current for TL4050C25QDBZT across its full –40°C to 125°C operating range is 65 μA. This value ensures regulation is maintained even at temperature extremes; at 25°C, typical minimum current is 41–60 μA. Designers must size the series resistor (R_S) to guarantee ≥65 μA flows through TL4050C25QDBZT under worst-case conditions (lowest supply voltage, highest load current, coldest ambient).