Part A
ADR4550BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2013 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Compatible functional replacement candidate
The ADR4540ARZ and ADR4550BRZ are both high-precision voltage references from the same ADR45xx family, sharing an identical SOIC-8 footprint and pinout, making them functionally interchangeable on an existing PCB. The primary distinction is the output voltage grade, with the ADR4550BRZ offering a higher 5.0 V output versus the 4.096 V of the ADR4540ARZ, alongside a tighter initial accuracy tolerance. Designers must confirm that the downstream circuitry can accommodate the higher reference voltage and verify the impact on ADC full-scale range and system calibration before substituting.
Output Voltage
Not compatible
Package Type
High match
Initial Accuracy
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4540ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3340 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR4540ARZ | ADR4550BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 4.096 V | 5.000 V | The reference voltage sets the full-scale input range of an ADC or DAC; a different value changes the system's measurement span and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.04% (A grade) | ±0.02% (B grade) | Initial accuracy determines the absolute error of the reference at room temperature; the B grade offers tighter tolerance, affecting overall system precision. |
| Temperature Coefficient | 2 ppm/°C (A grade) | 1 ppm/°C (B grade) | Drift over temperature directly impacts accuracy across the operating range; a lower tempco yields more stable performance in precision applications. |
| Output Current Capability | ±10 mA | ±10 mA | The source/sink current capability determines the load the reference can drive while maintaining regulation. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable supply range must accommodate the system rail; identical ranges mean both parts fit the same power architecture. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range defines the environments in which the part is guaranteed to meet specifications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility ensures the part can be placed on the same PCB footprint without layout changes. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current affects power budget in low-power and portable designs; matching values preserve the same power consumption. |
| Output Noise (0.1 Hz to 10 Hz) | 2.5 µV p-p (typ) | 2.5 µV p-p (typ) | Low-frequency noise limits resolution in precision measurement; identical noise performance preserves system accuracy. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4550BRZ | ADR4540ARZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 5V | 4.096V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.8µVp-p | 2.7µVp-p |
| Voltage - Input | 5.1V ~ 15V | 4.2V ~ 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 ADR4540ARZ and ADR4550BRZ voltage references?
The ADR4540ARZ provides a 4.096 V output with an initial accuracy of ±0.02% (A grade), while the ADR4550BRZ provides a 5.000 V output with an initial accuracy of ±0.02% (B grade). Both are low-noise, high-precision voltage references in an 8-lead SOIC package, but they differ in output voltage and specified accuracy grade.
Are the ADR4540ARZ and ADR4550BRZ 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, because the output voltages differ (4.096 V vs. 5.000 V), the surrounding circuit must be validated for the new output voltage before substitution.
What initial accuracy do the ADR4540ARZ and ADR4550BRZ specify?
The ADR4540ARZ (A grade) specifies an initial accuracy of ±0.02%, and the ADR4550BRZ (B grade) also specifies ±0.02% initial accuracy. Both are high-precision grades intended for applications requiring tight output tolerance.
What is the output voltage temperature coefficient of these references?
Both the ADR4540ARZ and ADR4550BRZ are specified with a low temperature coefficient of 2 ppm/°C (maximum) over the operating temperature range, supporting stable performance in precision measurement and industrial applications.
What output current can the ADR4540ARZ and ADR4550BRZ source and sink?
Both devices can source and sink output current, with the datasheet specifying output current capability of ±10 mA, making them suitable for driving moderate loads and ADC/DAC reference inputs.
What are the operating temperature ranges for the ADR4540ARZ and ADR4550BRZ?
Both the ADR4540ARZ and ADR4550BRZ are specified over the extended industrial temperature range of −40°C to +125°C, allowing use in harsh industrial and automotive-adjacent environments.
Can the ADR4550BRZ directly replace the ADR4540ARZ in an existing design?
Not without validation. Although the devices are pin-compatible and share the same package and grade-level accuracy, the output voltage changes from 4.096 V to 5.000 V. The system's ADC/DAC reference range, supply headroom, and load circuitry must be verified against the ADR4550BRZ datasheet before substitution.