Part A
ADR4520BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4412 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4550ARZ-R7 and ADR4520BRZ are both high-precision voltage references from the same ADR45xx family, sharing a common SOIC-8 footprint and series architecture, but they differ in output voltage and initial accuracy grade. The ADR4550ARZ-R7 provides a 5.0 V output with ±0.04% initial accuracy, while the ADR4520BRZ provides a 2.048 V output with ±0.1% initial accuracy. Because the output voltage differs, the ADR4520BRZ is not a direct drop-in substitute for the ADR4550ARZ-R7 in circuits designed for a 5.0 V reference; substitution requires validation of the target system's reference voltage requirements, accuracy budget, and thermal drift tolerance before adoption.
Output Voltage
Not compatible
Initial Accuracy
Validation required
Package Type
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4550ARZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6435 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 | ADR4550ARZ-R7 | ADR4520BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 5.0 V | 2.048 V | The reference voltage sets the full-scale input range of an ADC or the comparison threshold of a DAC; a different value directly changes system scaling 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 match here, so DC precision is comparable. |
| Temperature Coefficient | 1 ppm/°C (A grade) | 2 ppm/°C (B grade) | Tempco governs drift over temperature; the lower 1 ppm/°C of the ADR4550A yields tighter accuracy across the operating range than the 2 ppm/°C of the ADR4520B. |
| Output Current Capability | ±10 mA | ±10 mA | Source/sink current capability determines how much load the reference can drive while maintaining regulation; identical here, so load-driving behavior is equivalent. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable supply window must accommodate the system rail and provide adequate headroom above the output; identical ranges mean the same supply can be used. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current affects total power budget in low-power designs; matching values mean no change in supply loading. |
| Output Noise (0.1 Hz to 10 Hz) | 2.4 µV p-p (typ) | 1.25 µV p-p (typ) | Low-frequency noise limits achievable resolution in precision measurement; the ADR4520B has lower 1/f noise, which can improve SNR in high-resolution converters. |
| Long-Term Drift | 25 ppm/1000 h (typ) | 25 ppm/1000 h (typ) | Long-term drift affects calibration stability over the product lifetime; identical values indicate comparable aging behavior. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | The rated temperature range must cover the application environment; identical ranges mean equivalent environmental qualification. |
| Package | 8-Lead SOIC (R-8) | 8-Lead SOIC (R-8) | Package and pinout determine board footprint and layout compatibility; identical packages allow drop-in PCB reuse. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4520BRZ | ADR4550ARZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.048V | 5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 1µVp-p | 2.8µVp-p |
| Voltage - Input | 3V ~ 15V | 5.1V ~ 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 ADR4550ARZ-R7 and ADR4520BRZ?
The ADR4550ARZ-R7 is a 5.000 V output voltage reference with an initial accuracy grade of ±0.04% (A grade) in an 8-lead SOIC package supplied in 7-inch tape and reel. The ADR4520BRZ is a 2.048 V output voltage reference with an initial accuracy grade of ±0.02% (B grade) in an 8-lead SOIC package supplied in tube form. The primary differences are output voltage (5.000 V vs 2.048 V), initial accuracy grade (A vs B), and packaging format (reel vs tube).
Are the ADR4550ARZ-R7 and ADR4520BRZ pin-compatible?
Both devices are offered in the same 8-lead SOIC (R-8) package and share the same pinout defined in the ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550 datasheet. However, because the output voltages differ (5.000 V vs 2.048 V), they are not electrically interchangeable in a given circuit without verifying that the target design accepts the different reference voltage.
Can the ADR4520BRZ be used as a drop-in replacement for the ADR4550ARZ-R7?
No. Although both are 8-lead SOIC voltage references from the same ADR45xx family, the ADR4520BRZ provides a 2.048 V output while the ADR4550ARZ-R7 provides 5.000 V. A substitution would change the reference voltage by more than 3 V, which is not a valid drop-in replacement unless the entire signal chain is redesigned and validated for the lower reference.
How do the initial accuracy specifications compare between the two grades?
Per the ADR45xx datasheet, the A grade (ADR4550ARZ-R7) specifies an initial output voltage accuracy of ±0.04%, while the B grade (ADR4520BRZ) specifies ±0.02%. The B grade therefore offers tighter initial accuracy than the A grade, independent of the output voltage difference.
What are the operating temperature ranges for these two references?
Both the ADR4550ARZ-R7 and ADR4520BRZ are specified over the industrial temperature range of −40°C to +125°C, as stated in the ADR45xx family datasheet. The temperature coefficient specifications apply across this range.
What is the difference in packaging between the ADR4550ARZ-R7 and ADR4520BRZ?
The ADR4550ARZ-R7 suffix "R7" denotes 7-inch tape and reel packaging, suitable for automated pick-and-place assembly. The ADR4520BRZ is supplied in tube packaging. Both use the same 8-lead SOIC body, so the PCB footprint is identical; only the shipping/feed format differs.
Do both devices share the same long-term drift and thermal hysteresis characteristics?
The ADR45xx datasheet specifies long-term drift and thermal hysteresis for the family, and both the ADR4550ARZ-R7 and ADR4520BRZ are members of that family in the same package. Designers should consult the specific grade and voltage column in the datasheet, since some drift specifications are stated per grade rather than uniformly across all output voltages.
Which device should be selected for a 5 V signal chain versus a low-voltage 2.048 V ADC reference?
For a 5 V signal chain requiring a 5.000 V reference, the ADR4550ARZ-R7 is the appropriate choice. For a low-voltage ADC or DAC that requires a 2.048 V reference (a binary-friendly value for 12- to 16-bit converters), the ADR4520BRZ is appropriate. Selection should be based on the required reference voltage, accuracy grade, and packaging format rather than substitution between the two.