ADR5044WBRTZ-R7 - 4.096V Shunt Voltage Reference, ±0.1% | ADI
MPN: ADR5044WBRTZ-R7 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $2.18 | $2.18 |
| 10 | $1.96 | $19.60 |
| 100 | $1.62 | $162.00 |
| 500 | $1.34 | $670.00 |
| 1,000 | $1.08 | $1,080.00 |
ADR5044WBRTZ-R7 Overview
A shunt voltage reference is a two-terminal (cathode and anode) device that behaves like a precision Zener diode: it regulates the voltage across its terminals when biased with a current source, and its operating current is set by the external load or bias resistor. Compared with three-terminal series references, shunt references offer lower quiescent draw and simpler noise filtering, but they always draw a small standby current even when the load is off. Within the broader power management IC taxonomy, shunt references sit alongside series (bandgap) references and are used wherever a low-noise, low-drift reference voltage is needed.
The key specifications include a maximum temperature coefficient of 75 ppm/°C, an initial accuracy of better than 0.1% (B grade), and an operating temperature range of −40 °C to +125 °C. The "W" grade adds the automotive qualification (AEC-Q100) marker, and "BRTZ" denotes the SOT-23 (RT) package on tape and reel (R7). The advanced buried-Zener bandgap design eliminates the need for an external compensation capacitor and ensures stable operation with capacitive loads, simplifying PCB design in dense analog front ends.
Typical applications include automotive sensor signal conditioning, portable and battery-powered instrumentation, precision data acquisition front ends, current-loop (4-20 mA) transmitters, and reference rails for ADCs and DACs in industrial process control. The 4.096 V output is an exact multiple of 2^12, making it a natural fit for 12-bit and 14-bit ADCs that scale a full-scale input of 4.096 V to a 1-LSB step of 1 mV.
When designing with this reference, choose the bias resistor so that the cathode current stays between 50 µA and 15 mA under all load conditions. Add a 0.1 µF to 10 µF bypass capacitor directly across the reference to filter wideband noise, even though the device is stable without it. This page synthesizes distributor pricing, drop-in same-package alternatives, and practical design notes not found in the standalone manufacturer datasheet.
Drop-in alternatives for ADR5044WBRTZ-R7 — 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:
ADR5044BRTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADR5044WARTZ-R7
✅ Drop-In📋 Reference alternative (not in catalog)
ADR5044BRTZ-R2
✅ Drop-In📋 Reference alternative (not in catalog)
ADR5045BRTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADR5043BRTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADR5040BRTZ-REEL7
✅ Drop-In📋 Reference alternative (not in catalog)
ADR5044WBRTZ-R7 Specifications
| Reference Type | Shunt Voltage Reference |
| Output Voltage (Vref) | 4.096 V (fixed) |
| Initial Accuracy | ±0.1% (B grade, 4 mV) |
| Temperature Coefficient (max) | 75 ppm/°C |
| Cathode Current Range | 50 µA to 15 mA |
| Minimum Operating Current | 50 µA |
| Maximum Operating Current | 15 mA |
| Operating Temperature Range | −40 °C to +125 °C |
| Package | SOT-23-3 (TO-236AB) |
| Topology | Buried-Zener bandgap, 2-terminal shunt |
| External Compensation Capacitor | Not required (stable with any capacitive load) |
| Pinout | Pin 1 NC, Pin 2 Cathode, Pin 3 Anode (per datasheet) |
| Mounting Type | Surface Mount |
| MSL Level | 1 (per JEDEC J-STD-020) |
| RoHS Status | Compliant |
| AEC-Q100 | Qualified ("W" grade, automotive) |
| Lead-Free | Yes |
ADR5044WBRTZ-R7 Pin Configuration
| Pin 1 | NC — No Connect (per datasheet) |
| Pin 2 | K (Cathode) — Cathode - positive terminal; bias current flows in |
| Pin 3 | A (Anode) — Anode - ground reference |
Typical Applications
ADR5044WBRTZ-R7 is suitable for 6 applications: Automotive Sensor Signal Conditioning, Portable Battery-Powered Instrumentation, Precision Data Acquisition Front End, Current-Loop (4-20 mA) Transmitter, Reference Rail for ADCs in Process Control, Precision DAC Reference Voltage.
Automotive Sensor Signal Conditioning
The ADR5044WBRTZ-R7 is AEC-Q100 qualified ("W" grade) and delivers a stable 4.096 V reference rail for automotive sensor signal-conditioning front ends, including pressure, temperature, and position sensors. With ±0.1% initial accuracy (4 mV) and 75 ppm/°C maximum drift, the device holds the full-scale span stable across the −40 °C to +125 °C automotive Grade-1 temperature range, eliminating cold-start and under-hood thermal errors. The SOT-23-3 footprint drops next to op-amp gain stages and ADC references in compact ECU modules, while the 50 µA to 15 mA cathode current range allows direct biasing from a 5 V or 12 V sensor-supply rail through a single resistor.
Recommended
Portable Battery-Powered Instrumentation
The ADR5044WBRTZ-R7's 50 µA minimum operating current makes it well suited to battery-powered handheld instruments where every microampere of standby current matters. The shunt topology lets the reference run continuously at low bias even when the load is off, while the 4.096 V output feeds 12-bit ADCs such as the AD7091R directly for a 1 mV-per-LSB scale. With no external compensation capacitor required and stable operation with any capacitive load, the reference simplifies PCB layout in dense DMM and data-logger designs. The 4.096 V level also allows direct operation from a single-cell Li-ion (3.7 V nominal) plus a boost converter, eliminating a separate rail.
Recommended
Precision Data Acquisition Front End
The 4.096 V output of the ADR5044WBRTZ-R7 is exactly 2^12 mV, mapping a 12-bit ADC full-scale input of 0-4.096 V to a clean 1 mV-per-LSB step. For 14-bit SAR converters such as the AD9249 or 16-bit sigma-delta ADCs such as the AD7190, the 75 ppm/°C drift is small enough that the reference is not the dominant source of full-scale error after calibration. Place the ADR5044WBRTZ-R7 within a few centimeters of the ADC reference pin, bypass it with 0.1 µF + 10 µF ceramics, and route a Kelvin connection from the reference to the ADC for maximum gain accuracy.
Recommended
Current-Loop (4-20 mA) Transmitter
The ADR5044WBRTZ-R7 provides the precision voltage reference for a 4-20 mA current-loop transmitter that drives a field sensor or actuator signal over long industrial cabling. The shunt topology and 50 µA to 15 mA cathode range allow direct biasing from the loop supply while still delivering a stable reference for the ADC and excitation current source. Its 75 ppm/°C drift over −40 °C to +85 °C industrial ambient keeps the loop accuracy within the ±0.1% class of HART-compatible smart transmitters, and the SOT-23-3 package fits inside standard field-mount heads.
Recommended
Reference Rail for ADCs in Process Control
In process-control applications, the ADR5044WBRTZ-R7 supplies a low-noise reference rail to 12-bit, 14-bit, and 16-bit SAR ADCs that digitize thermocouple, RTD, and 4-20 mA signals. The 4.096 V full-scale voltage eliminates the divide-by-2 scaling resistors that would otherwise be needed with a 5 V or 10 V reference, saving board area. The 75 ppm/°C temperature coefficient is small enough that the absolute process variable error after calibration is dominated by the ADC's INL and the sensor's own drift, not by the reference.
Recommended
Precision DAC Reference Voltage
The ADR5044WBRTZ-R7 supplies the reference input to 12-bit and 14-bit precision DACs where its 4.096 V fixed output and 75 ppm/°C drift maintain monotonicity across the −40 °C to +125 °C operating range. The shunt topology and low 50 µA bias current let the reference feed the DAC's Vref pin while the DAC drives a low-side load. The SOT-23-3 package fits adjacent to the DAC output amplifier, and a 0.1 µF to 10 µF bypass capacitor across the reference keeps wideband noise out of the DAC output. Use a 2.5 V or 5 V reference variant if your system DAC uses a different full-scale range.
Recommended
Recommended Products Summary
Engineering reference data for ADR5044WBRTZ-R7 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ADR5044BRTZ-REEL7 | ADR5044WARTZ-R7 | ADR5044BRTZ-R2 | ADR5045BRTZ-REEL7 | ADR5043BRTZ-REEL7 | ADR5040BRTZ-REEL7 |
|---|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | SOT-23-3 | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same | SOT-23-3 - same |
| Output Voltage (Vref) | 4.096 V | 4.096 V (same) | 4.096 V (same) | 4.096 V (same) | 5.0 V | 3.0 V | 2.048 V |
| Initial Accuracy | ±0.1% (4 mV, B-grade) | ±0.1% (4 mV) | ±0.1% (4 mV) | ±0.1% (4 mV) | ±0.1% (5 mV) | ±0.1% (3 mV) | ±0.1% (2 mV) |
| Temperature Coefficient | 75 ppm/°C max | 75 ppm/°C max | 75 ppm/°C max | 75 ppm/°C max | 75 ppm/°C max | 75 ppm/°C max | 75 ppm/°C max |
| Cathode Current Range | 50 µA to 15 mA | 50 µA to 15 mA | 50 µA to 15 mA | 50 µA to 15 mA | 50 µA to 15 mA | 50 µA to 15 mA | 50 µA to 15 mA |
| AEC-Q100 Qualification | Yes (W-grade) | No (industrial B-grade) | Yes (W-grade, automotive) | No (industrial) | No (industrial) | No (industrial) | No (industrial) |
| Operating Temperature Range | −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 | −40 °C to +125 °C | −40 °C to +125 °C |
| External Cap Required | No (stable with any C-load) | No | No | No | No | No | No |
| Approx. Price @ 1k pcs (USD) | 1.08 | 1.05 | 1.10 | 1.10 | 1.05 | 1.05 | 1.05 |
Key Differentiators
- Automotive AEC-Q100 qualification in a 4.096 V shunt reference (vs ADR5044BRTZ-REEL7)
- No external compensation capacitor required (vs LM4040-4.1)
- Pin-compatible with LM4040/LM4050 footprint (vs LM4040-4.1)
Design Notes
Estimated: for a 5 V supply, a 4.096 V reference, and 1 mA load, the bias resistor RB = (VIN − VREF) / (IK + IL) = (5 − 4.096) / (0.050 mA + 1 mA) ≈ 860 Ω. Sized for the worst-case load corner, choose a standard 887 Ω or 910 Ω. Verify that IK never falls below 50 µA in dropout and never exceeds 15 mA in short-circuit, otherwise the reference will mis-regulate or be damaged.
Estimated: maximum power dissipation in the SOT-23-3 reference is Pmax = (VIN_max − VREF) × IKA_max = (5.5 − 4.096) × 15 mA ≈ 21 mW. With a SOT-23-3 θJA of ~200 °C/W, junction temperature rise above ambient is ~4 °C at full bias, so thermal drift is not a concern at room temperature. In hot automotive under-hood environments, keep the reference away from power dissipators so its self-heating does not exceed 1-2 °C above ambient.
Place the ADR5044WBRTZ-R7 within 5-10 mm of the ADC reference pin, and route a Kelvin connection (separate trace from the reference output to the ADC Vref pin) if the ADC is more than 5 cm away. Add a 0.1 µF X7R ceramic bypass capacitor directly across the cathode-to-anode pins to filter wideband shot and thermal noise; a 10 µF ceramic in parallel lowers low-frequency noise further. The exposed pad (if present on the SC70 variant) is internally floating and may be left open or tied to NC per datasheet.
Common pitfall #1: choosing a bias resistor that is too large for the worst-case minimum load, causing the cathode current to fall below 50 µA and the reference to drop out. Pitfall #2: omitting the bypass capacitor and accepting the resulting wideband noise that aliases into the ADC. Pitfall #3: routing high-current switching traces near the reference output, which couples switching noise into the 4.096 V rail via PCB capacitance. Pitfall #4: assuming the W-grade is interchangeable with the B-grade - the W-grade is AEC-Q100 qualified while the B-grade is industrial.
Compliance Information
AEC-Q100 qualified via 'W' grade designator in part number suffix. RoHS compliant per Analog Devices product page. REACH compliance per Analog Devices policy. Halogen-free status not specified in provided web data - marked unknown.
