Part A
ADR4525ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4570 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Compatible functional replacement candidate
The ADR4525ARZ and ADR4520BRZ are both precision voltage references from the same ADR4520 family, sharing an identical SOIC-8 package, series-mode topology, and wide operating temperature range, making them strong functional replacement candidates. The primary distinction is the output voltage grade (2.5 V versus 2.0 V), which must be validated against the target circuit's reference requirements before substitution.
Output Voltage
Not compatible
Package Type
High match
Reference Topology
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4520BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4412 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 | ADR4525ARZ | ADR4520BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 2.048 V | The reference voltage sets the full-scale value of the ADC/DAC; a different output voltage changes the system's measurement range and scaling. |
| Initial Accuracy | ±0.02% (A grade) | ±0.02% (B grade) | Initial accuracy determines the absolute error at room temperature before any calibration; both grades offer the same tight tolerance. |
| Temperature Coefficient | 2 ppm/°C (A grade) | 2 ppm/°C (B grade) | Drift over temperature directly affects accuracy in precision systems; matching tempco ensures comparable stability across the operating range. |
| Output Current Capability | ±10 mA | ±10 mA | Source/sink current capability determines how much load the reference can drive while maintaining regulation. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable supply range must accommodate the system rail while providing sufficient headroom above the reference output. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | The temperature range defines the environments in which the reference is guaranteed to meet its specifications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility affects PCB footprint and thermal behavior; identical packages allow drop-in layout reuse. |
| Long-Term Drift | 25 ppm/1000 hrs | 25 ppm/1000 hrs | Long-term drift affects accuracy over the product lifetime and determines recalibration intervals. |
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 | ADR4525ARZ | ADR4520BRZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V | 2.048V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.04% | ±0.02% |
| Temperature Coefficient | 4ppm/°C | 2ppm/°C |
| Noise - 01 Hzto10 Hz | 1.25µVp-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 are the key differences between the ADR4525ARZ and ADR4520BRZ voltage references?
The ADR4525ARZ provides a 2.500 V output with ±0.04% initial accuracy (A grade), while the ADR4520BRZ provides a 2.048 V output with ±0.04% initial accuracy (B grade). Both are members of the ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550 family of low-noise, high-precision voltage references in an 8-lead SOIC package, but they differ in output voltage and specified accuracy grade.
Are the ADR4525ARZ and ADR4520BRZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with an identical pinout, so they are pin-compatible. However, because the output voltages differ (2.500 V vs 2.048 V), they are not electrically interchangeable without verifying that the target design accepts the different reference voltage.
What initial accuracy and temperature coefficient do these references specify?
The ADR4525ARZ (A grade) specifies ±0.04% initial accuracy and a temperature coefficient of 2 ppm/°C (maximum). The ADR4520BRZ (B grade) specifies ±0.04% initial accuracy and a temperature coefficient of 2 ppm/°C (maximum). Both grades share the same accuracy and drift specifications; the primary distinction is the output voltage.
What output voltage does each device provide?
The ADR4525ARZ provides a fixed 2.500 V output. The ADR4520BRZ provides a fixed 2.048 V output. The suffix number in the ADR452x family denotes the nominal output voltage, so the ADR4520 is a 2.048 V reference and the ADR4525 is a 2.500 V reference.
What are the supply voltage and operating current requirements for these references?
Both the ADR4525ARZ and ADR4520BRZ operate from a supply voltage of 3.0 V to 15 V and typically draw 950 µA of quiescent current. Designs must ensure the supply headroom above the respective output voltage (2.500 V or 2.048 V) meets the datasheet dropout requirement.
How do the noise and long-term stability specifications compare?
Both devices specify low output noise of 1.25 µV p-p (0.1 Hz to 10 Hz) and long-term stability of 25 ppm/1000 hours (typical). These specifications are common across the ADR4520/ADR4525 family, so noise and drift performance are equivalent between the two parts.
Can the ADR4520BRZ be used as a drop-in replacement for the ADR4525ARZ?
Not directly. Although both are pin-compatible 8-lead SOIC devices with similar accuracy and drift, the output voltage differs (2.048 V vs 2.500 V). A replacement is only valid if the system's ADC reference, signal scaling, and compliance limits are revalidated for the lower 2.048 V reference; otherwise the change alters the measurement full-scale range.
What are the operating temperature range and package options for these parts?
Both the ADR4525ARZ and ADR4520BRZ are specified over the −40°C to +125°C operating temperature range and are supplied in the 8-lead SOIC package (R-8 suffix). The "Z" suffix indicates RoHS-compliant packaging per Analog Devices nomenclature.