Texas Instruments REF2933AIDBZTG4

Overview

REF2933AIDBZTG4 from Texas Instruments is a precision 3.3 V CMOS voltage reference in SOT-23-3 package, delivering ±0.7% initial accuracy (3.234–3.366 V), 100 ppm/°C max temperature drift, 50 µA max quiescent current, and 1 mV min dropout voltage. It serves as a stable analog reference for ADCs, DACs, and sensor signal chains in portable instrumentation and medical devices.

For engineers reviewing the REF2933AIDBZTG4 datasheet, REF2933AIDBZTG4 pinout, REF2933AIDBZTG4 application, or REF2933AIDBZTG4 equivalent, key selection criteria include low-load-current stability, no-output-capacitor operation, thermal hysteresis ≤100 ppm, and compatibility with –40°C to 125°C industrial environments.

Technical Context

The REF2933AIDBZTG4 implements a curvature-compensated band-gap topology with two bipolar transistors (Q1, Q2) biased at different current densities; their V_BE difference-positive TC-is amplified and summed with Q2's negative-TC V_BE to yield near-zero net temperature coefficient. This architecture achieves 35–100 ppm/°C drift over –40°C to 125°C.

It operates as a series-connected, three-terminal shunt-like reference: input (IN), output (OUT), and ground (GND). Load regulation is specified at 3–100 µV/mA (0–25 mA), and it remains stable without output capacitance-though 0.47 µF input bypass is recommended. Dropout is defined as V_IN – V_OUT, with 1 mV minimum under no load.

Key Specifications

Pinout & Package

SOT-23-3 (DBZ) package: 2.92 mm × 1.30 mm body, 1.0 mm height, gull-wing leads. RoHS-compliant, lead-free, and qualified per JEDEC J-STD-020 moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADR3433ARJZ-R7 and MAX6033AESA+T, REF2933AIDBZTG4 trades absolute drift and hysteresis performance for ultra-low-cost, minimal-board-area implementation and robust 25 mA drive capability-making it optimal for cost-sensitive, high-volume portable instrumentation where moderate accuracy suffices.

Availability

REF2933AIDBZTG4 is available at Aetrix Electronics and suitable for portable medical sensors, industrial data acquisition front-ends, and battery-powered test meters requiring stable component supply with guaranteed long-term continuity.

Supply support for REF2933AIDBZTG4 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 and embedded processing technologies, with decades of expertise in precision analog ICs and power management solutions.

The REF29xx family was designed specifically for low-power, high-accuracy voltage referencing in portable and harsh-environment applications-emphasizing minimal quiescent current, wide temperature operation, and capacitor-free stability.

FAQ

What is the minimum input voltage required for stable operation of REF2933AIDBZTG4?

The REF2933AIDBZTG4 requires a minimum input voltage of V_OUT + 50 mV (i.e., 3.35 V) under loaded conditions up to 25 mA. In unloaded operation, it functions down to V_OUT + 1 mV (3.301 V), per the datasheet's dropout specification. Operation below these thresholds risks loss of regulation and increased output impedance.

Does REF2933AIDBZTG4 require an output capacitor for stability?

No, REF2933AIDBZTG4 is internally compensated and stable with any capacitive load-including zero capacitance. Unlike many references, it does not require an output capacitor for phase margin. However, an input bypass capacitor ≥0.47 µF is mandatory to maintain PSRR and prevent oscillation during supply transients.

What is the thermal hysteresis specification for REF2933AIDBZTG4?

REF2933AIDBZTG4 exhibits thermal hysteresis of 25–100 ppm, defined as the output voltage shift after cycling from 25°C → –40°C → 125°C → 25°C. This parameter reflects mechanical stress-induced changes in the die and packaging; it is distinct from temperature drift and impacts repeatability in systems undergoing repeated thermal cycles.

How does load regulation affect REF2933AIDBZTG4 output accuracy at full 25 mA load?

At 25 mA load, REF2933AIDBZTG4 exhibits ≤100 µV/mA load regulation, resulting in up to 2.5 mV (±0.076%) deviation from no-load output. This error is linear and predictable-enabling software correction if high-precision ratiometric measurements are needed across varying loads.

Is REF2933AIDBZTG4 compatible with lead-free reflow profiles?

Yes, REF2933AIDBZTG4 in DBZ (SOT-23-3) package is rated for standard lead-free reflow per JEDEC J-STD-020, with peak temperature up to 260°C for 30 seconds. Its moisture sensitivity level is 1, meaning floor life is unlimited at ≤30°C/85% RH-no dry-bag storage or baking required prior to assembly.