Part A
ADR4525ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4570 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4525ARZ and ADR4520ARZ are both members of the same ADR4520 series of high-precision voltage references, sharing an identical package, pinout, and output topology. The ADR4525ARZ provides a 2.5 V output while the ADR4520ARZ provides a 2.0 V output, so the two parts are functionally interchangeable only where the system can accommodate the different reference voltage. Designers must confirm that downstream circuitry, ADC full-scale settings, and supply headroom are compatible with the alternate output voltage before substituting.
Output Voltage
Validation required
Package Type
High match
Pin Configuration
High match
Output Type
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 | ADR4525ARZ | ADR4520ARZ | 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% | ±0.02% | Initial accuracy determines the absolute error of the reference at room temperature, directly affecting system calibration requirements. |
| Temperature Coefficient | 2 ppm/°C (max) | 2 ppm/°C (max) | Low tempco keeps the reference stable over temperature, which is critical for precision measurement accuracy across the operating range. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | The drive capability determines whether the reference can directly supply the load or requires buffering. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The supply range must be compatible with the system rail; both parts share the same headroom requirement. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current affects total power budget, important for low-power and portable designs. |
| Low-Frequency Noise | 1.25 µV p-p (0.1 Hz to 10 Hz) | 1.25 µV p-p (0.1 Hz to 10 Hz) | Low-frequency noise limits the achievable resolution of high-precision converters and low-noise analog front ends. |
| Long-Term Drift | 25 ppm/1000 hr | 25 ppm/1000 hr | Long-term drift determines how much recalibration is needed over the product lifetime. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package and pinout allow drop-in board replacement without layout changes. |
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 | 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 | ±0.04% | ±0.04% |
| Temperature Coefficient | 4ppm/°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 ADR4525ARZ and ADR4520ARZ voltage references?
Both devices are members of the ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550 family of high-precision, low-noise voltage references in an 8-lead SOIC package (R suffix). The primary difference is the output voltage: the ADR4525ARZ provides a 2.500 V output, while the ADR4520ARZ provides a 2.048 V output. Both share the same electrical architecture, package, and pinout, so selection is driven by the required reference voltage in the target design.
Are the ADR4525ARZ and ADR4520ARZ pin-compatible?
Yes. Both parts are offered in the same 8-lead SOIC (R-8) package with an identical pinout, so they are pin-compatible. However, because the output voltage differs (2.500 V vs 2.048 V), the surrounding circuit and system calibration must be validated for the selected reference voltage before substitution.
What initial accuracy and temperature coefficient do these references offer?
The ADR4520ARZ and ADR4525ARZ are specified with an initial output voltage accuracy of ±0.02% (A grade) and a temperature coefficient of 2 ppm/°C maximum over the −40°C to +125°C operating range, per the Analog Devices ADR4520/ADR4525 datasheet. These specifications apply to both output voltage variants.
What is the output voltage noise of the ADR4525ARZ and ADR4520ARZ?
Both devices are specified with low output voltage noise of 1.25 µV p-p (0.1 Hz to 10 Hz) and 2.4 µV rms (10 Hz to 10 kHz), according to the Analog Devices ADR4520/ADR4525 datasheet. The noise performance is common to both voltage variants.
What is the operating temperature range and supply voltage for these references?
Both the ADR4525ARZ and ADR4520ARZ are specified over the −40°C to +125°C industrial temperature range. They operate from a supply voltage of 3.0 V to 15 V, with a low quiescent current of 950 µA typical, as stated in the Analog Devices datasheet.
Can the ADR4520ARZ be used as a drop-in replacement for the ADR4525ARZ?
Physically, yes, since both are pin-compatible 8-lead SOIC devices. Electrically, no, because the output voltage differs (2.048 V vs 2.500 V). A replacement requires re-validating the system's reference voltage, ADC/DAC full-scale calibration, and any resistor divider networks that depend on the reference value.
What are the long-term stability specifications for these voltage references?
Per the Analog Devices ADR4520/ADR4525 datasheet, both devices are specified with long-term stability of 25 ppm typical at 1000 hours and 50 ppm typical at 4500 hours. This specification applies to both the ADR4520ARZ and ADR4525ARZ variants.