Texas Instruments REF1941AIDDCT

Overview

REF1941AIDDCT from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC providing precise VREF = 4.096 V and VBIAS = 2.048 V outputs for single-supply signal conditioning. It delivers ±0.1% initial accuracy, 25 ppm/°C max temperature drift over –40°C to 125°C, and ±20 mA output current per rail-enabling high-precision biasing in ADC front-ends for industrial data acquisition and motor control systems.

For engineers reviewing the REF1941AIDDCT datasheet, REF1941AIDDCT pinout, REF1941AIDDCT application, or REF1941AIDDCT equivalent, key selection criteria include VREF/VBIAS tracking performance (7 ppm/°C max), ultra-low dropout (10 mV at 20 mA), and SOT23-5 package compatibility with space-constrained PCB layouts in battery-powered and safety-critical instrumentation.

Technical Context

The REF1941AIDDCT implements a band-gap core with e-Trim™ post-mold calibration to achieve matched drift and initial accuracy on both outputs. Its dual-buffer architecture ensures VBIAS = VREF / 2 is derived directly from the same reference node-not via resistive division-enabling tight tracking (±2 ppm/°C over –40°C to 85°C) critical for bipolar signal biasing in single-supply ADCs.

It operates from VIN ≥ VREF + 20 mV (4.116 V min), supports enable-controlled shutdown (quiescent current ≤ 5 µA), and maintains stability with capacitive loads up to 10 µF. Both outputs source and sink current equally, with identical electrical specs-including 3 ppm/V line regulation and 8 ppm/mA load regulation-verified across –40°C to 125°C.

Key Specifications

Pinout & Package

SOT23-5 package (2.90 mm × 1.60 mm), surface-mount, lead-free, RoHS-compliant. Thermal resistance R_θJA = 193.6 °C/W enables >100 mW dissipation in standard FR4 layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with MAX6190AESA+ and ADR4540BRZ, REF1941AIDDCT uniquely integrates matched VREF/VBIAS outputs in a micro SOT23-5 package with sub-10 mV dropout-enabling single-chip biasing for bipolar ADC interfaces without sacrificing accuracy, size, or power efficiency.

Availability

REF1941AIDDCT is available at Aetrix Electronics and suitable for industrial process control, medical instrumentation, data acquisition systems, and motor control feedback requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for REF1941AIDDCT 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 voltage references and signal-chain solutions.

The REF19xx family was designed specifically for high-accuracy, single-supply systems needing matched dual references-targeting industrial automation, test equipment, and medical diagnostics where VREF/VBIAS tracking and low dropout are critical.

FAQ

What is the maximum allowable input voltage for REF1941AIDDCT?

The absolute maximum input voltage (VIN) for REF1941AIDDCT is 6 V, as specified in the Absolute Maximum Ratings table. Operation above this level risks permanent damage. For reliable long-term performance, VIN should remain within the recommended range of VREF + 0.02 V (4.116 V) to 5.5 V under all load and temperature conditions. Exceeding 5.5 V may degrade parametric performance even if below 6 V.

Does REF1941AIDDCT support bidirectional output current on both VREF and VBIAS pins?

Yes, REF1941AIDDCT supports ±20 mA output current on both VREF and VBIAS pins. Each output can source up to 20 mA into a load or sink up to 20 mA from a load-enabling direct drive of ADC reference inputs, op-amp bias networks, and small capacitive loads without external buffers. This bidirectional capability is verified across –40°C to 125°C and is identical for both outputs.

How does the e-Trim™ technology improve REF1941AIDDCT performance?

e-Trim™ is a post-package laser trimming method applied after plastic molding to calibrate both VREF and VBIAS outputs simultaneously. It minimizes errors from transistor mismatch and mechanical stress-induced drift, achieving ±0.1% initial accuracy and ±25 ppm/°C temperature drift. Unlike die-level trimming, e-Trim™ corrects package-induced shifts-ensuring REF1941AIDDCT maintains spec after reflow soldering and thermal cycling.

Can REF1941AIDDCT operate with a 10 µF output capacitor?

Yes, REF1941AIDDCT is stable with output capacitors up to 10 µF, as confirmed in the Electrical Characteristics table. This allows robust filtering of supply noise and improved transient response in noisy industrial environments. However, large capacitors (>1 µF) increase turn-on settling time to ~500 µs (0.1% settling, CL = 1 µF) or longer-designers must verify timing margins in fast-wake-up systems.

What is the thermal hysteresis specification for REF1941AIDDCT?

REF1941AIDDCT exhibits ≤60 ppm thermal hysteresis on VREF and ≤60 ppm on VBIAS, measured as the output voltage shift after cycling from 25°C → –40°C → 125°C → 25°C. This value reflects real-world PCB-mounted behavior and is critical for applications requiring repeatable measurements across temperature excursions-such as automated test equipment and environmental monitoring systems.