Part A
ADR4520ARZ
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 2343 PCS
- Package
- SOIC-8
- Series
- PMIC - 전압 참조
Replacement verdict
Compatible functional replacement candidate
The ADR4525BRZ-R7 and ADR4520ARZ are both precision voltage references from the same ADR4520 family, sharing an identical package footprint and pinout, making them functionally interchangeable in many designs. However, the ADR4525BRZ-R7 offers a higher output voltage and tighter initial accuracy, while the ADR4520ARZ provides a lower reference voltage. Designers should verify that the output voltage and accuracy grade meet the target circuit requirements before substituting.
Output Voltage
Validation required
Package Type
High match
Pin Configuration
High match
Initial Accuracy Grade
Validation required
Parts at a glance
Part B
ADR4525BRZ-R7
아날로그 디바이스(주)
- Lifecycle
- Active
- Stock
- 7672 PCS
- Package
- SOIC-8
- Series
- PMIC - 전압 참조
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR4525BRZ-R7 | ADR4520ARZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 2.0 V | The reference voltage sets the full-scale value of the ADC/DAC; a different output voltage means the two parts are not directly interchangeable without recalibration. |
| Initial Accuracy | ±0.02% (B grade) | ±0.1% (A grade) | Initial accuracy determines the uncalibrated system error; the B-grade part offers five times tighter tolerance than the A-grade part. |
| Temperature Coefficient | 2 ppm/°C (max) | 8 ppm/°C (max) | Drift over temperature directly affects measurement stability; the lower tempco of the B-grade part yields better accuracy across the operating range. |
| Output Current Capability | ±10 mA | ±10 mA | Determines the load the reference can drive; identical capability means both can support similar external circuitry. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | Defines the allowable input supply; matching ranges mean both parts fit the same power rail design. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current impacts power budget; identical values mean no change in power consumption when substituting. |
| 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 systems; matching noise performance preserves signal integrity. |
| Long-Term Drift | 25 ppm/1000 hr (typ) | 25 ppm/1000 hr (typ) | Long-term stability affects calibration intervals; identical drift means comparable lifetime accuracy. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility ensures the part fits the same PCB footprint without layout changes. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | Defines the environmental envelope; matching ranges mean both parts suit the same application conditions. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4520ARZ | ADR4525BRZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.048V | 2.5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.04% | ±0.02% |
| Temperature Coefficient | 4ppm/°C | 2ppm/°C |
| Noise - 01 Hzto10 Hz | 1µVp-p | 1.25µVp-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 ADR4525BRZ-R7 and the ADR4520ARZ?
The ADR4525BRZ-R7 provides a fixed 2.5 V output with a B-grade initial accuracy of ±0.02% and a maximum temperature coefficient of 1 ppm/°C, while the ADR4520ARZ provides a fixed 2.048 V output with an A-grade initial accuracy of ±0.04% and a maximum temperature coefficient of 2 ppm/°C. Both are series voltage references in the same SOIC-8 package, but they differ in output voltage and accuracy grade.
Are the ADR4525BRZ-R7 and ADR4520ARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package with the same pinout, so they are pin-compatible. However, because their output voltages differ (2.5 V vs 2.048 V), they are not electrically interchangeable in a given design without verifying the system's reference voltage requirements.
What is the initial accuracy of each device?
The ADR4525BRZ-R7 (B grade) has an initial accuracy of ±0.02% maximum. The ADR4520ARZ (A grade) has an initial accuracy of ±0.04% maximum. The B grade therefore offers tighter initial tolerance than the A grade.
How do the temperature coefficients compare?
The ADR4525BRZ-R7 is specified with a maximum temperature coefficient of 1 ppm/°C over the −40 °C to +125 °C range. The ADR4520ARZ is specified with a maximum temperature coefficient of 2 ppm/°C over the same range. The ADR4525BRZ-R7 therefore provides better drift performance.
What are the output voltage options and package for these references?
The ADR4525BRZ-R7 outputs 2.5 V, and the ADR4520ARZ outputs 2.048 V. Both are series-mode voltage references housed in an 8-lead SOIC package and are specified over the −40 °C to +125 °C operating temperature range.
Can the ADR4520ARZ be used as a drop-in replacement for the ADR4525BRZ-R7?
No, not as a direct electrical replacement. Although they share the same package and pinout, the output voltages differ (2.048 V vs 2.5 V). A drop-in substitution would change the reference voltage seen by the downstream circuitry, so the design must be revalidated against the 2.048 V output before substitution.
Which device offers better precision for high-accuracy signal chains?
The ADR4525BRZ-R7 offers better precision, with ±0.02% initial accuracy and 1 ppm/°C maximum temperature coefficient, compared with ±0.04% and 2 ppm/°C for the ADR4520ARZ. For designs requiring the tightest reference stability, the B-grade ADR4525BRZ-R7 is the higher-precision option, provided a 2.5 V reference is acceptable.