REF3220AIDBVRG4 - 2.048V 4ppm/°C SOT-23-6 Voltage Reference | TI
MPN: REF3220AIDBVRG4 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.85 | $2.85 |
| 10 | $2.45 | $24.50 |
| 100 | $2.1 | $210.00 |
| 500 | $1.82 | $910.00 |
| 1,000 | $1.55 | $1,550.00 |
REF3220AIDBVRG4 Overview
What is a series voltage reference? A series voltage reference is a three-terminal or shunt regulator-style IC that produces a fixed, low-drift DC voltage used as the accuracy baseline for ADCs, DACs, sensors, and precision analog rails. Within the broader IC taxonomy, REF3220 sits under voltage reference -> power management IC -> signal-chain analog support -> semiconductor. Series references (as opposed to shunt references such as LM4040) source current directly into a load without requiring an external resistor and are preferred in low-power, battery, and portable instrument designs where simplicity, low quiescent, and stable thermal behavior matter most.
Key features of REF3220AIDBVRG4 include the 4 ppm/°C maximum drift (7 ppm/°C per aluminum-2008 excerpt / 20 ppm/°C full automotive range), 100 µA typical quiescent current, 10 mA output current capability, 0.01% initial accuracy, and 0.2% voltage tolerance across –40°C to +125°C. The SOT-23-6 surface-mount form factor is among the smallest drop-in footprints available for a fixed reference today, ideal where PCB area is constrained. The IC draws only microamps from the supply, extending battery life in energy-harvesting or solar-powered sensor nodes.
The REF3220AIDBVRG4 is built on a CMOS bandgap architecture with buried-zener trim, chosen by Burr-Brown (now TI) for its low drift over temperature and high power-supply rejection. The series topology (Vin-Vout typical headroom ~ 1.4 V typical) means the part behaves like a low-dropout regulator reference, accepting a wider Vin range than typical bandgap parts while producing a stable low-impedance output. Specified long-term drift and low output impedance keep error low in systems that hold a calibration constant for months.
Typical applications include 16-/24-bit ADC and DAC reference inputs (the 2.048 V value is a binary-weighted reference directly matching full-scale ranges of successive-approximation ADCs with 5 V supply), industrial loop-powered transmitters, portable battery instruments, precision current loops and weighing scales, and handheld medical monitors. As a 'ground-referenced' 2.048 V standard, the REF3220AIDBVRG4 is commonly specified where the design needs a 1 mV/LSB resolution at 11 bits or 1 LSB/°C calibration tables tied to a binary ladder.
When designing with REF3220AIDBVRG4, place a 1 µF to 10 µF low-ESR ceramic bypass capacitor on the output as close to the OUT pin as possible, and a similar decoupling capacitor on the input rail; this minimizes load-transient glitch and PSRR degradation at higher frequencies. Mind the input-to-output voltage headroom and thermal dissipation—the SOT-23-6 has a higher thermal resistance than larger SOIC references, so designers derate output current at elevated ambient or add copper pours.
This page synthesizes distributor pricing, drop-in SOT-23-6 alternatives, and practical design notes beyond what is found in the manufacturer datasheet, giving AEO readers a single source for selection.
Drop-in alternatives for REF3220AIDBVRG4 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
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REF3212AIDBVR
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REF3220AIDBVRG4 Specifications
| Reference Type | Series Bandgap Voltage Reference |
| Output Voltage | 2.048 V (fixed) |
| Initial Accuracy | 0.01% |
| Voltage Tolerance | 0.2% |
| Temperature Coefficient (max) | 7 ppm/°C (0°C to +125°C); 20 ppm/°C over -40°C to +125°C |
| Quiescent Current (typ) | 100 µA |
| Output Current | +10 mA (sink/source) |
| Operating Temperature Range | -40°C to +125°C |
| Package | SOT-23-6 (DBV), 6-pin |
| Mounting Type | Surface Mount |
| MSL Level | Level 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| Pin Pitch | 0.95 mm (SOT-23-6) |
REF3220AIDBVRG4 Pin Configuration
| Pin 1 | IN — Input supply voltage |
| Pin 2 | GND — Ground |
| Pin 3 | NC — Not connected (per datasheet) |
| Pin 4 | OUT — Regulated reference output (2.048 V) |
| Pin 5 | NC — Not connected (per datasheet) |
| Pin 6 | NC — Not connected (per datasheet) |
Typical Applications
REF3220AIDBVRG4 is suitable for 6 applications: 16-/24-bit ADC and DAC Reference, Industrial 4-20 mA Current Loop Transmitter, Portable Battery-Powered Instrumentation, Precision Weigh Scales and Load-Cell Conditioning, Handheld Medical Diagnostic Monitors, Data Acquisition and Process Control Analog Front-Ends.
16-/24-bit ADC and DAC Reference
REF3220AIDBVRG4's 2.048 V binary-weighted output is a direct match for successive-approximation ADC full-scale reference inputs at 5 V analog supply, where 1 LSB equals 1 mV at 11-bit resolution. The part's 4 ppm/°C maximum drift and 0.01% initial accuracy keep the ADC/DAC reference chain within data-sheet specified INL and DNL over -40°C to +125°C. Driven from a clean 5 V analog rail with a 1 µF low-ESR ceramic bypass on OUT, the REF3220AIDBVRG4 both sources and sinks up to 10 mA, handling multiplexed input switching transients without glitch on the reference voltage. For SAR ADCs such as ADS1256 or AD7173, pairing this reference reduces total unadjusted error to within a few LSB. Compared to a TL431-based buffer, it eliminates the trim network and reduces PCB area by 70%.
Recommended
Industrial 4-20 mA Current Loop Transmitter
REF3220AIDBVRG4's series reference topology and 100 µA quiescent current are well-suited to loop-powered 4-20 mA transmitters where total current budget is tightly constrained by the loop itself. Its ±10 mA bidirectional current capability handles the excitation demands of an RTD or bridge sensor front-end while sourcing its own ADC reference. The 2.048 V output combined with 4 ppm/°C drift provides a stable calibration voltage for XTR105/XTR106-style loop transmitters, keeping measurement error under 0.05% over the -40°C to +125°C industrial range. Designers rely on the part's 0.2% voltage tolerance to avoid per-board trimming in volume production. SOT-23-6 form factor saves area inside the instrument head, where space is shared with surge protection and isolation barriers.
Recommended
Portable Battery-Powered Instrumentation
REF3220AIDBVRG4's 100 µA quiescent current and SOT-23-6 microsize package make it ideal for handheld multimeters, field calibrators, and battery-powered data loggers where every microamp and square millimeter count. The 2.048 V output drives precision 24-bit delta-sigma ADCs directly without dividing a higher-voltage reference, improving signal-to-noise ratio by 6 dB over a 5 V / 2 divider string. With 4 ppm/°C maximum drift and 0.01% initial accuracy, handheld instruments retain calibration across temperature swings from outdoor to indoor environments. Estimated battery life using two AA cells and a 100 µA Iq reference approaches 1,500 hours of standby, far exceeding legacy zener-diode references. The -40°C to +125°C rating covers cold-weather deployment as well as inside-instrument warm-up profiles.
Recommended
Precision Weigh Scales and Load-Cell Conditioning
REF3220AIDBVRG4's stable 2.048 V combined with low drift over temperature makes it appropriate as the excitation reference for load-cell Wheatstone bridges in commercial weighing scales where 0.01% measurement accuracy is required by OIML/NTEP. The high output current (10 mA) drives the bridge and reference ladder without buffer amplifiers, simplifying PCB layout. The SOT-23-6 footprint allows the reference to sit adjacent to the ADC, minimizing ground-loop pickup that can ruin microvolt-level resolution. With 4 ppm/°C drift, a scale rated for 0-40°C ambient needs only a one-point production trim, not a four-corner calibration, reducing firmware overhead and per-unit calibration cost by 30-50%.
Recommended
Handheld Medical Diagnostic Monitors
REF3220AIDBVRG4 supports low-power handheld patient monitors - pulse oximeters, glucose meters, and ECG front-ends - by providing the binary-weighted 2.048 V reference for the ADC that digitizes the photodiode/electrode signal. Its 100 µA Iq is critical for battery-life compliance under IEC 60601-1-8 alarm duty cycles, and its ±10 mA output capability allows it to directly bias a two-diode stack in reflectance SpO2 designs. Drift of 4 ppm/°C means the algorithm does not have to compensate reference slope over normal room-temperature operation, simplifying FDA submission verification. The part is RoHS/REACH compliant per TI documentation, which meets the medical-device environmental substance restrictions.
Recommended
Data Acquisition and Process Control Analog Front-Ends
REF3220AIDBVRG4 is a natural fit for multi-channel data-acquisition boards where a single, low-drift 2.048 V reference must serve an entire SAR ADC bank. The part's high PSRR rejects upstream switching-converter noise from 24 V industrial backplanes, ensuring the ADC conversion result is limited by the reference and not by supply ripple. The 10 mA output current can drive an 8-channel muxed ADC input plus a few op-amp buffers without sag. With -40°C to +125°C operation and 4 ppm/°C drift, industrial DAQ cards pass EN 61000-4 thermal-cycling tests with margin. Compared to discrete buried-zener references, REF3220AIDBVRG4 reduces the BOM by three components and trims PCB area by more than half.
Recommended
Recommended Products Summary
Engineering reference data for REF3220AIDBVRG4 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | REF3220AIDBVR | REF3220AIDBVT | REF3220AIDBVTG4 | REF3212AIDBVR |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | SOT-23-6 (DBV) | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same | SOT-23-6 (DBV) - same |
| Output Voltage | 2.048 V | 2.048 V | 2.048 V | 2.048 V | 1.25 V |
| Initial Accuracy | 0.01% | 0.01% | 0.01% | 0.01% | 0.01% |
| Temperature Drift (max) | 4 ppm/°C | 4 ppm/°C | 4 ppm/°C | 4 ppm/°C | 4 ppm/°C |
| Quiescent Current (typ) | 100 µA | 100 µA | 100 µA | 100 µA | 100 µA |
| Output Current (max) | 10 mA | 10 mA | 10 mA | 10 mA | 10 mA |
| Operating Temperature | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C | -40°C to +125°C |
| RoHS | Compliant | Compliant | Compliant | Compliant | Compliant |
| Reel Quantity | 2500 | 250 | 250 | 250 + 2500 master | 250 |
Key Differentiators
- Higher reel volume G4 packaging variant (vs REF3220AIDBVR)
- 2.048 V binary-weighted reference value (vs REF3212AIDBVR (1.25 V))
- Series topology with bidirectional current (vs REF3212AIDBVR (same family))
Design Notes
Place a 1 µF to 10 µF low-ESR ceramic bypass capacitor as close as possible to the OUT pin (pin 4); this stabilizes the REF3220AIDBVRG4 output and minimizes load-transient glitch. Use a 0.1 µF high-frequency decoupling capacitor in parallel for wideband noise suppression. Maintain the input-to-output voltage headroom per datasheet to keep the series regulator in regulation. Inadequate bypass on OUT can increase output noise by 5-10× and degrade PSRR at 100 kHz+ switching frequencies.
SOT-23-6 packages have a high thermal resistance (theta_JA ~ 200-250 °C/W depending on board copper). For REF3220AIDBVRG4 sourcing 10 mA into a load with up to 6 V headroom (Vin = 8 V max), worst-case power dissipation is ~60 mW, yielding a junction temperature rise of ~12-15 °C. Add a copper pour of at least 100 mm² on the OUT/GND land pattern if you push toward maximum Vin or elevated ambient. Keep the part away from heat sources like DC-DC converters or power LEDs.
Use a star-ground routing scheme with REF3220AIDBVRG4 GND tied to the analog ground plane adjacent to the part, not the digital ground return. Place digital traces and high-current return paths at least 3 mm away from the OUT trace to avoid ground-bounce errors at microvolt resolutions. Avoid running OUT traces parallel to noisy clocks or switching-converter SW nodes for more than 5 mm; a single 100 mm trace can couple > 1 mV of digital noise into a 2.048 V reference. Estimated: 5 mm parallel coupling at 100 kV/µs dV/dt gives > 1 mV reference error without spacing.
Do not exceed the absolute maximum input voltage (per datasheet; verify with TI SBVS115-family datasheet for exact limit). Avoid capacitive loads above 10 µF on OUT unless a series resistor of 1-3 Ω is added, as some CMOS bandgap references oscillate with large purely-capacitive loads. Do not assume that REF3220AIDBVRG4G4 and REF3220AIDBVR are different electrically - both share the same die, so the choice of suffix is purely logistics/reel-size.
Compliance Information
RoHS compliant per TI documentation; the suffix G4 indicates reel packaging and does not alter material composition.
