Texas Instruments REF2025AISDDCR

Overview

REF2025AISDDCR from Texas Instruments is a dual-output, low-drift, low-power voltage reference IC delivering precise 2.5 V (VREF) and 1.25 V (VBIAS = VREF/2) outputs in a single SOT-23-5 package. It achieves ±0.05% initial accuracy, 8 ppm/°C max temperature drift over –40°C to 125°C, and 6 ppm/°C max VREF–VBIAS tracking over –40°C to 85°C - enabling high-precision biasing of bipolar ADC inputs in single-supply industrial metering and instrumentation.

For engineers reviewing the REF2025AISDDCR datasheet, REF2025AISDDCR pinout, REF2025AISDDCR application, or REF2025AISDDCR equivalent, this device supports critical design requirements including ultra-low dropout (10 mV), ±20 mA output drive, 360 µA quiescent current, and matte-Sn plating for corrosion resistance in harsh environments such as electricity meters and circuit breakers.

Technical Context

The REF2025AISDDCR implements a band-gap core with e-Trim™ post-mold calibration to minimize initial error and thermal drift across both outputs. Its dual-buffer architecture ensures matched VREF and VBIAS outputs with guaranteed tracking performance - not merely independent references.

It operates from a minimum input voltage only 20 mV above VREF (VIN ≥ VREF + 0.02 V), enabling use in battery-powered systems down to ~2.52 V supply. The EN pin provides enable/disable control with logic-compatible threshold (EN ≥ VIN – 0.7 V), and both outputs source/sink ±20 mA symmetrically.

Key Specifications

Pinout & Package

SOT-23-5 (DDC) package: 2.90 mm × 1.60 mm body, matte-Sn finish for enhanced corrosion resistance per Battelle Class III requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with REF2025AIDDCR, the matte-Sn variant offers verified corrosion resistance for harsh deployments; compared with ADR4525BRZ, REF2025AISDDCR eliminates external components and guarantees matched tracking - reducing BOM cost, layout area, and long-term calibration burden.

Availability

REF2025AISDDCR is available at Aetrix Electronics and suitable for electricity metering, analog I/O modules, and servo drive control requiring stable component supply with extended temperature performance and corrosion resilience.

Supply support for REF2025AISDDCR 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 REF20xx family was designed specifically for high-accuracy, low-power industrial measurement systems requiring dual-rail referencing - targeting electricity meters, programmable logic controllers, and medical instrumentation where reliability and long-term stability are critical.

FAQ

What is the maximum operating temperature range for the REF2025AISDDCR?

The REF2025AISDDCR is fully specified from –40°C to +125°C ambient temperature. Its 8 ppm/°C maximum temperature coefficient applies across this full range, and its VREF–VBIAS tracking is guaranteed to ≤7 ppm/°C over –40°C to 125°C. The device's absolute maximum junction temperature is 150°C, and thermal metrics (e.g., RθJA = 193.6°C/W) support reliable operation in compact, unventilated enclosures typical of electricity meters and industrial controllers.

Does the REF2025AISDDCR require an external output capacitor?

No, the REF2025AISDDCR is internally compensated and stable with 0 µF to 10 µF output capacitance on either VREF or VBIAS. Unlike many references, it does not require a minimum capacitor for stability - simplifying layout and enabling direct connection to ADC reference inputs or op-amp bias nodes without added components. This behavior is validated across all load conditions and temperature extremes per TI SBOS600E test data.

How does the matte-Sn plating on REF2025AISDDCR improve reliability?

The matte-Sn plating on REF2025AISDDCR meets Battelle Class III corrosion resistance standards, providing significantly enhanced protection against humidity, salt fog, and industrial contaminants compared to standard Sn finishes. This is critical for field-deployed equipment such as outdoor electricity meters, circuit breakers, and substation monitoring units where long-term parametric stability must be maintained despite environmental exposure - confirmed by TI's qualification testing per IPC-J-STD-006 and JESD22-A112.

Can the REF2025AISDDCR drive a 10 kΩ load on both outputs simultaneously?

Yes. Each output (VREF and VBIAS) can source or sink up to ±20 mA independently. A 10 kΩ load draws only 0.25 mA at 2.5 V - well within specification - and introduces negligible error (<0.0025% load regulation). The REF2025AISDDCR's 8 ppm/mA load regulation ensures <±0.02 mV error under this condition, preserving accuracy for high-resolution ADC applications without additional buffering.

What is the turn-on time for the REF2025AISDDCR after enabling the EN pin?

The REF2025AISDDCR achieves 0.1% settling on both VREF and VBIAS outputs in 500 µs when a 1 µF output capacitor is used, as measured per TI SBOS600E. This fast wake-up supports power-gated architectures in portable instrumentation and battery-operated field devices. Turn-on time increases slightly with larger capacitors (e.g., 10 µF extends settling to ~1.2 ms), but remains deterministic and monotonic across temperature and supply voltage.