Part A
ADR4533ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3692 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4525ARZ-R7 and ADR4533ARZ share the same series architecture, package, and pinout, making them functionally interchangeable in many designs; however, the 2.5 V versus 3.3 V output difference requires validation against the target system's reference voltage requirements before substitution.
Output Voltage
Validation required
Package Type
High match
Pin Configuration
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4525ARZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6327 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-R7 | ADR4533ARZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 3.3 V | The nominal reference voltage directly sets the full-scale range of the ADC/DAC; a different value changes system scaling and prevents drop-in substitution without recalibration. |
| Initial Accuracy | ±0.02% | ±0.02% | Initial accuracy determines the untrimmed error at room temperature; matching values means comparable system-level precision without calibration. |
| Temperature Coefficient | 2 ppm/°C (max) | 2 ppm/°C (max) | Drift over temperature dominates precision error in wide-temperature applications; identical specs ensure equivalent stability performance. |
| Output Current Capability | ±10 mA | ±10 mA | Determines the load the reference can drive (e.g., ADC reference inputs and buffering); equal capability supports similar loading conditions. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | Defines the allowable input supply headroom; identical ranges allow the same power rail to be reused in the design. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current affects total power budget, especially in low-power or battery-operated systems; matching values preserve power consumption. |
| 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 achievable resolution in high-precision converters; identical noise performance maintains the same effective number of bits. |
| Long-Term Drift | 25 ppm/1000 hr | 25 ppm/1000 hr | Long-term stability affects calibration intervals and lifetime accuracy; equal drift specs mean comparable maintenance requirements. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Footprint and thermal characteristics must match for board-level interchangeability; identical packages allow the same PCB layout. |
Need help validating a replacement?
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4533ARZ | ADR4525ARZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 3.3V | 2.5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.04% | ±0.04% |
| Temperature Coefficient | 4ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.1µVp-p | 1.25µVp-p |
| Voltage - Input | 3.4V ~ 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-R7 and ADR4533ARZ voltage references?
The ADR4525ARZ-R7 provides a fixed 2.5 V output, while the ADR4533ARZ provides a fixed 3.3 V output. Both are members of the ADR45xx family of low-noise, high-accuracy voltage references in an 8-lead SOIC package, but they differ in output voltage and therefore in the input headroom required for regulation.
What initial accuracy and temperature coefficient do these references specify?
Both the ADR4525ARZ-R7 and ADR4533ARZ are A-grade devices offering ±0.04% initial accuracy and a temperature coefficient of 2 ppm/°C (maximum) over the specified operating temperature range, per the Analog Devices ADR45xx datasheet.
Are the ADR4525ARZ-R7 and ADR4533ARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package with an identical pinout, so the footprint and PCB land pattern are the same. Electrical differences such as output voltage and minimum supply headroom must still be validated for the target design.
What is the minimum supply voltage required for each device?
The ADR4525ARZ-R7 requires a supply voltage of at least 2.7 V to regulate its 2.5 V output, while the ADR4533ARZ requires a higher supply to regulate its 3.3 V output. The exact minimum and maximum supply limits should be confirmed against the Analog Devices ADR45xx datasheet for the specific grade.
What output noise performance do these references offer?
The ADR45xx family is characterized by low output noise, with typical 0.1 Hz to 10 Hz noise specified in the microvolt peak-to-peak range and low wideband noise density. Consult the Analog Devices ADR45xx datasheet for the exact noise figures applicable to the ADR4525ARZ-R7 and ADR4533ARZ.
Can the ADR4525ARZ-R7 be replaced by the ADR4533ARZ in an existing design?
Not directly. Although the packages and pinouts match, the output voltage differs (2.5 V versus 3.3 V), so a replacement changes the reference voltage seen by the downstream circuitry. The design must be revalidated for the new output voltage and the associated supply headroom requirements.
What are typical applications for these voltage references?
Both devices are suited to precision data acquisition, industrial instrumentation, medical equipment, and high-resolution ADC/DAC reference applications where low noise, tight initial accuracy, and low temperature drift are required. The choice between them depends on whether the system requires a 2.5 V or 3.3 V reference.