Active production — what it means for your BOM line
The REF2041QDDCRQ1 carries an Active product status from Texas Instruments — no end-of-life notice, no last-time-buy window to track. For a BOM that already qualifies this reference, the supply channel is the standard distribution network, not surplus or broker inventory. The Automotive, AEC-Q100 series designation means the part has passed the full suite of automotive reliability stress tests: high-temperature operating life, temperature cycling, and ESD qualification to the AEC-Q100 Grade 1 temperature range of -40°C to 125°C ambient.
Dual output voltages and the drift that matters
This is a series voltage reference with two fixed output options selected at the factory: 2.048V or 4.096V. The 8ppm/°C temperature coefficient means the output voltage shifts less than 0.8 mV over the full -40°C to 125°C range at the 4.096V setting — relevant for an ADC reference that must hold accuracy across an engine bay's thermal cycle. The low-frequency noise spec of 12ppmp-p from 0.1 Hz to 10 Hz sets the noise floor for precision measurement chains. For a 16-bit ADC with a 4.096V reference, this noise contribution is roughly 50 µV peak-to-peak — below one LSB for most automotive sensor interfaces. Supply current is 460 µA typical, and the output can source up to 20 mA. The 20 mA capability means a single REF2041 can drive multiple ADC reference inputs or a small resistive load without an external buffer — the 460 µA quiescent draw is the penalty for keeping the reference powered in an always-on module.
Package and supply rail constraints
Housed in the SOT-23-5 Thin (TSOT-23-5) package, the footprint is 2.9 mm × 1.6 mm with a 0.95 mm pin pitch — the same land pattern as the standard SOT-23-5, so no special pad geometry is needed. The thin profile (1.0 mm max height) clears low-profile enclosures. Input voltage range is 4.116V to 5.5V. The lower bound of 4.116V is the minimum headroom above the 4.096V output — the reference needs at least 20 mV of dropout. On a nominal 5V rail, a 4.75V minimum supply still leaves 634 mV of margin; on a 3.3V rail the 2.048V output is the only viable option. Surface-mount assembly with the TSOT-23-5 package follows standard reflow profiles per JEDEC J-STD-020. The package is compatible with both Tape & Reel (TR) and Cut Tape (CT) delivery formats for prototyping or production volume.