Part A
ADR4540BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7461 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4525ARZ and ADR4540BRZ share the same series architecture, package, and pinout, making them functionally interchangeable in many designs; however, the differing output voltage and initial accuracy grade require validation against the target circuit's reference requirements before substitution.
Output Voltage
Validation required
Package Type
High match
Pin Configuration
High match
Initial Accuracy Grade
Validation required
Parts at a glance
Part B
ADR4525ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4570 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 | ADR4540BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 4.096 V | The reference voltage sets the full-scale input range of an ADC or DAC; a different value changes the system's measurement scale and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.02% (A grade) | ±0.02% (B grade) | Initial accuracy determines the absolute error of the reference at room temperature; both grades offer tight tolerance, but the grade suffix indicates tested accuracy class. |
| Temperature Coefficient | 2 ppm/°C (max, A grade) | 2 ppm/°C (max, B grade) | Drift over temperature directly affects system accuracy across the operating range; matching tempco is critical for precision applications. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | Determines the load the reference can drive; identical capability means similar buffering requirements for downstream circuitry. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | Defines the allowable input supply; identical ranges mean the same power rail can be used for either part. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Ensures the part meets specifications across the application's environmental conditions; identical ranges support the same thermal design. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Footprint and pinout compatibility allow drop-in replacement on an existing PCB layout. |
| 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) | Noise limits the resolution of precision converters; identical noise performance preserves system signal-to-noise ratio. |
| Long-Term Drift | 25 ppm/1000 hr | 25 ppm/1000 hr | Long-term stability affects calibration intervals; matching drift behavior supports equivalent lifetime accuracy expectations. |
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 | ADR4540BRZ | ADR4525ARZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 4.096V | 2.5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.7µVp-p | 1.25µVp-p |
| Voltage - Input | 4.2V ~ 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 ADR4540BRZ voltage references?
The ADR4525ARZ provides a 2.500 V output with an initial accuracy of ±0.04% (A grade), while the ADR4540BRZ provides a 4.096 V output with an initial accuracy of ±0.02% (B grade). Both are low-noise, high-accuracy voltage references in the same SOIC-8 package, but they differ in output voltage, accuracy grade, and specified temperature coefficient.
Are the ADR4525ARZ and ADR4540BRZ 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 (2.500 V vs 4.096 V), the surrounding circuit must be validated for the new output voltage before substitution.
What output voltage does each device provide?
The ADR4525ARZ provides a fixed 2.500 V output, and the ADR4540BRZ provides a fixed 4.096 V output. The 4.096 V value of the ADR4540BRZ is convenient for 12-bit and 16-bit ADC reference applications.
How do the initial accuracy specifications compare?
The ADR4525ARZ (A grade) has an initial accuracy of ±0.04%, while the ADR4540BRZ (B grade) has an initial accuracy of ±0.02%. The B grade of the ADR4540BRZ offers tighter initial accuracy than the A grade of the ADR4525ARZ.
What are the operating temperature ranges of these references?
Both the ADR4525ARZ and ADR4540BRZ are specified for the extended industrial temperature range of −40°C to +125°C, making them suitable for industrial and instrumentation applications.
Can the ADR4540BRZ directly replace the ADR4525ARZ in an existing design?
Not without design review. Although the devices are pin-compatible, the output voltage changes from 2.500 V to 4.096 V, which affects ADC full-scale range, divider ratios, and any circuitry referenced to the reference voltage. The replacement must be validated against the target design and manufacturer documentation.
What package do the ADR4525ARZ and ADR4540BRZ use?
Both devices are supplied in an 8-lead SOIC package (RZ suffix), which allows the same PCB land pattern to be used for either part.