Part A
ADR4520BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4412 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Compatible functional replacement candidate
The ADR4520ARZ and ADR4520BRZ are functionally interchangeable voltage reference ICs sharing identical package, pinout, output voltage, and operating temperature range; the only distinction is the initial accuracy grade, where the B-grade offers a tighter tolerance than the A-grade. The ADR4520BRZ can serve as a drop-in replacement for the ADR4520ARZ with improved accuracy, while substitution in the reverse direction requires validation against the tighter accuracy budget of the original design.
Output Voltage
High match
Package Type
High match
Operating Temperature Range
High match
Initial Accuracy Grade
Validation required
Parts at a glance
Part B
ADR4520ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2343 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR4520ARZ | ADR4520BRZ | Why it matters |
|---|---|---|---|
| Initial Accuracy (Vout) | ±0.04% (max) | ±0.02% (max) | Tighter initial tolerance reduces system calibration effort and directly affects output voltage precision at room temperature. |
| Temperature Coefficient | 2 ppm/°C (max) | 1 ppm/°C (max) | Lower drift over temperature improves accuracy in precision instrumentation and data acquisition across the operating range. |
| Output Voltage Noise (0.1 Hz to 10 Hz) | 1.25 µV p-p (typ) | 1.25 µV p-p (typ) | Low-frequency noise limits resolution in high-resolution ADCs and precision measurement front ends. |
| Output Voltage | 2.048 V | 2.048 V | The nominal output must match the target reference voltage for the application to be functionally substitutable. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | Compatible supply range ensures the part can operate in the same rail configuration without redesign. |
| Output Current Capability | ±10 mA (source/sink) | ±10 mA (source/sink) | Drive capability determines whether the reference can directly bias downstream loads such as ADC reference inputs. |
| Operating Temperature Range | −40°C to +125°C | −40°C to +125°C | Matching temperature range ensures both parts are usable in the same environmental conditions. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout allow drop-in replacement on the same PCB footprint. |
| Long-Term Drift | 25 ppm/1000 hr (typ) | 25 ppm/1000 hr (typ) | Long-term stability affects recalibration intervals and sustained accuracy in fielded systems. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4520BRZ | ADR4520ARZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.048V | 2.048V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 1µVp-p | 1µVp-p |
| Voltage - Input | 3V ~ 15V | 3V ~ 15V |
| Supply Current | 950µA | 950µA |
| Operating Temperature | -40°C ~ 125°C (TA) | -40°C ~ 125°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the ADR4520ARZ and ADR4520BRZ?
The ADR4520ARZ and ADR4520BRZ are both 2.048 V high-precision voltage references from Analog Devices in an 8-lead SOIC package. The primary difference is the initial accuracy grade: the A-grade (ADR4520ARZ) offers ±0.02% initial accuracy, while the B-grade (ADR4520BRZ) offers a tighter ±0.01% initial accuracy. Both share the same temperature coefficient, long-term drift, and electrical specifications otherwise.
Are the ADR4520ARZ and ADR4520BRZ pin-compatible and package-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pinout and footprint, so they are drop-in compatible from a mechanical and PCB layout perspective. The difference is limited to the accuracy grade marking and specification.
What is the initial output voltage accuracy of each grade?
The ADR4520ARZ (A-grade) specifies ±0.02% initial accuracy, corresponding to approximately ±0.41 mV on the 2.048 V output. The ADR4520BRZ (B-grade) specifies ±0.01% initial accuracy, corresponding to approximately ±0.20 mV. Both are specified at 25°C.
Do the ADR4520ARZ and ADR4520BRZ have the same temperature coefficient?
Yes. Both grades are specified with a temperature coefficient of 2 ppm/°C maximum over the −40°C to +125°C operating range, per the Analog Devices ADR4520 datasheet. The grade difference is in initial accuracy, not in temperature drift.
Can the ADR4520ARZ be substituted with the ADR4520BRZ in an existing design?
Yes, the ADR4520BRZ is a higher-accuracy grade of the same device and is pin-compatible, so it can replace the ADR4520ARZ without layout changes. The reverse substitution (B-grade to A-grade) is only acceptable if the design tolerates the wider ±0.02% initial accuracy specification.
What are the key shared electrical specifications of the ADR4520ARZ and ADR4520BRZ?
Both devices provide a 2.048 V output with low output noise (typically 1.25 µV p-p from 0.1 Hz to 10 Hz), a low dropout voltage, and a supply current of approximately 950 µA typical. They operate from a supply voltage of 3 V to 15 V and are specified over the −40°C to +125°C temperature range.
Which grade should be selected for a precision data acquisition design?
For designs where initial system error budget is critical, such as high-resolution ADCs or precision instrumentation, the ADR4520BRZ is preferred because its ±0.01% initial accuracy reduces the reference contribution to total error. The ADR4520ARZ remains suitable where ±0.02% initial accuracy is acceptable and cost is a consideration.