Part A
ADR4525BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4547 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4520ARZ and ADR4525BRZ share the same series architecture, package, and pinout, making them functionally interchangeable in most designs; however, the ADR4525BRZ offers a higher output voltage and tighter initial accuracy, so the replacement is valid only where the increased reference voltage and improved tolerance are acceptable to the application.
Output Voltage
Not compatible
Initial Accuracy
High match
Package Type
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4520ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2343 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
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 | ADR4525BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.048 V | 2.500 V | The reference voltage sets the full-scale input range of an ADC or DAC; a different value changes the system's measurement scaling and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.04% (max) | ±0.02% (max) | Initial accuracy determines the untrimmed error at room temperature; the tighter grade of the B version reduces system calibration effort and end-of-line error budget. |
| Temperature Coefficient | 2 ppm/°C (max) | 1 ppm/°C (max) | Drift over temperature directly affects accuracy in precision instrumentation; the lower tempco of the B grade improves performance across the operating range. |
| Output Current Capability | ±10 mA | ±10 mA | The source/sink current capability determines how much load the reference can drive while maintaining regulation; identical capability means similar load-driving behavior. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable supply range must accommodate the system rail; matching ranges mean the same power supply can be used for either part. |
| 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 specifications; identical ranges ensure equivalent environmental applicability. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package and pinout compatibility allows a drop-in footprint replacement on an existing PCB without layout changes. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current affects total power budget in low-power systems; matching values mean equivalent power consumption impact. |
| Output 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 precision measurement; identical noise performance preserves the achievable signal-to-noise ratio. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4525BRZ | ADR4520ARZ |
|---|---|---|
| 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 | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°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 ADR4520ARZ and ADR4525BRZ voltage references?
The ADR4520ARZ provides a 2.048 V output with ±0.04% initial accuracy (A grade), while the ADR4525BRZ provides a 2.500 V output with ±0.02% initial accuracy (B grade). Both are low-noise, high-precision voltage references in an 8-lead SOIC package, but they differ in output voltage and accuracy grade.
Are the ADR4520ARZ and ADR4525BRZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, so they are pin-compatible. However, the different output voltage and accuracy grade must be validated against the target design before substitution.
What is the initial accuracy specification for each part?
The ADR4520ARZ (A grade) has an initial accuracy of ±0.04%, while the ADR4525BRZ (B grade) has an initial accuracy of ±0.02%. The B grade offers tighter initial tolerance than the A grade.
What output voltage does each device provide?
The ADR4520ARZ provides a fixed 2.048 V output, and the ADR4525BRZ provides a fixed 2.500 V output. The output voltage is set internally and cannot be adjusted externally.
What are the operating temperature ranges for these voltage references?
Both the ADR4520ARZ and ADR4525BRZ are specified over the extended industrial temperature range of −40°C to +125°C, making them suitable for demanding industrial and instrumentation applications.
What is the typical output voltage noise for these devices?
Both devices feature low output voltage noise of approximately 1.25 µV p-p (0.1 Hz to 10 Hz) typical, which supports high-resolution ADC and DAC applications requiring a stable reference.
Can the ADR4525BRZ directly replace the ADR4520ARZ in an existing design?
Not without validation. Although the devices are pin-compatible, the output voltage differs (2.500 V vs 2.048 V) and the accuracy grade differs (B vs A). The system must be verified to accept the higher reference voltage and the changed accuracy tolerance before substitution.