Part A
ADR4550BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2013 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4520ARZ and ADR4550BRZ are both high-precision voltage references from the same ADR45xx family, sharing identical package, pinout, and output topology, but they differ in output voltage and initial accuracy grade. The ADR4550BRZ offers a higher output voltage with tighter initial accuracy, making it a viable functional substitute only where the circuit can accommodate the increased reference voltage and where the improved accuracy grade is acceptable. Designers must verify that downstream circuitry tolerates the 5.0 V versus 2.048 V reference level 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
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 | ADR4520ARZ | ADR4550BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.048 V | 5.000 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 in a given circuit. |
| Initial Accuracy | ±0.04% (max) | ±0.02% (max) | Initial accuracy determines the systematic error of the reference at room temperature; the B-grade part offers tighter tolerance. |
| Temperature Coefficient | 2 ppm/°C (max) | 1 ppm/°C (max) | Drift over temperature directly affects measurement stability; a lower tempco yields better accuracy across the operating range. |
| Output Current Capability | ±10 mA | ±10 mA | Determines how much load the reference can drive while maintaining regulation; identical here so load-driving behavior is comparable. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | Defines the allowable input supply window; matching ranges mean both fit the same power rail constraints. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Confirms both parts are rated for the same environmental conditions, important for industrial and automotive applications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package ensures footprint and PCB layout compatibility between the two parts. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current affects total system power budget; matching values mean equivalent power consumption. |
| Output Noise (0.1 Hz to 10 Hz) | 1.25 µV p-p (typ) | 1.25 µV p-p (typ) | Low-frequency noise limits achievable resolution in precision systems; identical noise performance supports similar accuracy. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4550BRZ | ADR4520ARZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 5V | 2.048V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.8µVp-p | 1µVp-p |
| Voltage - Input | 5.1V ~ 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 ADR4520ARZ and ADR4550BRZ voltage references?
The ADR4520ARZ provides a 2.048 V output with ±0.02% initial accuracy (A grade), while the ADR4550BRZ provides a 5.000 V output with ±0.02% initial accuracy (B grade). Both are members of the ADR45xx family in an 8-lead SOIC package, but they differ in output voltage, output voltage grade, and specified temperature coefficient grade.
What output voltage does each device provide?
The ADR4520ARZ delivers a fixed 2.048 V output, and the ADR4550BRZ delivers a fixed 5.000 V output. The output voltage is set internally and cannot be adjusted externally.
What initial accuracy and temperature coefficient grades do these two parts carry?
The ADR4520ARZ is an A-grade device with ±0.02% initial accuracy and a low temperature coefficient specified in the ADR4520 datasheet. The ADR4550BRZ is a B-grade device with ±0.02% initial accuracy and its own specified temperature coefficient per the ADR4550 datasheet. Designers should confirm the exact TC specification from the respective manufacturer datasheet for the target grade.
Are the ADR4520ARZ and ADR4550BRZ pin-compatible?
Both devices are offered in the same 8-lead SOIC (R-8) package with the same pinout, so they are pin-compatible at the package level. However, because their output voltages differ (2.048 V vs 5.000 V), they are not electrically interchangeable in a given design without verifying that the system tolerates the different reference voltage.
What is the operating temperature range for these references?
Both the ADR4520ARZ and ADR4550BRZ are specified for the extended industrial temperature range of −40°C to +125°C, as stated in the Analog Devices ADR45xx datasheet.
What supply voltage and current requirements apply to these parts?
Both devices operate from a supply voltage of 3.0 V to 15 V and typically draw a low quiescent current in the range of hundreds of microamperes, per the ADR45xx datasheet. The ADR4550BRZ requires a supply headroom above its 5.000 V output, so the minimum supply must exceed the output plus dropout; the ADR4520ARZ with its 2.048 V output has more headroom at low supply voltages.
Can the ADR4550BRZ be used as a drop-in replacement for the ADR4520ARZ?
No. Although both share the same 8-lead SOIC package and pinout, the output voltages differ (5.000 V vs 2.048 V). A drop-in replacement would change the reference voltage seen by the ADC or DAC and is only acceptable if the entire signal chain is redesigned or re-scaled and verified against the manufacturer datasheet.
What are typical applications for each reference?
The ADR4520ARZ (2.048 V) is commonly used as a precision reference for ADCs and DACs in portable and low-voltage systems where a 2.048 V full-scale range is convenient. The ADR4550BRZ (5.000 V) suits precision data acquisition, industrial instrumentation, and systems requiring a 5 V full-scale reference. Both are low-noise, high-accuracy references per the Analog Devices ADR45xx family documentation.