Part A
ADR4525BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4547 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4550ARZ-R7 and ADR4525BRZ are both high-precision voltage references from the same ADR45xx family, sharing identical package, pinout, and output topology, making them strong functional replacement candidates. The primary distinction is the output voltage (5.0 V versus 2.5 V), which must be validated against the target circuit's reference requirement before substitution. Designers should confirm that the lower 2.5 V output of the ADR4525BRZ satisfies the system's full-scale input range and that the tighter initial accuracy grade of the B version is acceptable for the application.
Output Voltage
Validation required
Package Type
High match
Pin Configuration
High match
Initial Accuracy Grade
Validation required
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 | ADR4525BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 5.0 V | 2.5 V | The regulated output voltage must match the target reference level required by the downstream ADC/DAC or system; these parts are not directly substitutable without redesign. |
| Initial Accuracy | ±0.02% (A grade) | ±0.02% (B grade) | Initial accuracy determines the absolute error of the reference at room temperature, directly affecting system measurement precision. |
| Temperature Coefficient | 1 ppm/°C (A grade) | 1 ppm/°C (B grade) | Low tempco keeps the reference stable across temperature, which is critical for high-resolution data converters in varying environments. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | Drive capability determines whether the reference can supply the load current required by the converter's reference input without droop. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The supply range must be compatible with the system rail; both parts share the same wide input range, easing supply design. |
| Package | 8-Lead SOIC (R-8) | 8-Lead SOIC (R-8) | Package and footprint compatibility allows drop-in replacement on an existing PCB layout. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | The temperature range must cover the application environment to guarantee specified performance over the operating conditions. |
| Long-Term Drift | 25 ppm/1000 hrs | 25 ppm/1000 hrs | Long-term drift affects calibration stability over the product lifetime, important for precision instrumentation. |
| Output Noise (0.1 Hz to 10 Hz) | 1.25 µV p-p | 1.25 µV p-p | Low-frequency noise limits the achievable resolution of high-precision converters and low-noise analog front ends. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4525BRZ | ADR4550ARZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V | 5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 1.25µVp-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 the ADR4525BRZ?
The primary difference is the output voltage: the ADR4550ARZ-R7 provides a 5.000 V reference, while the ADR4525BRZ provides a 2.500 V reference. Both are members of Analog Devices' ADR45xx family of low-noise, high-accuracy voltage references, but they differ in initial accuracy grade and temperature coefficient grade. The ADR4550ARZ-R7 is an A-grade device, and the ADR4525BRZ is a B-grade device, so the accuracy and drift specifications must be compared per the respective datasheets.
Are the ADR4550ARZ-R7 and ADR4525BRZ pin-compatible?
Both devices are offered in the same 8-lead SOIC package (RZ suffix) with the same pinout, so they are pin-compatible when the package suffix matches. However, because the output voltages differ (5.000 V vs 2.500 V), they are not electrically interchangeable in a given circuit without verifying that the downstream circuitry accepts the different reference voltage.
What is the initial accuracy of each device?
The ADR4550ARZ-R7 (A grade) has an initial accuracy of ±0.04% maximum, while the ADR4525BRZ (B grade) has an initial accuracy of ±0.04% maximum as well, per the Analog Devices ADR45xx datasheet. Designers should confirm the exact grade-specific limits in the current datasheet revision before finalizing a design.
How do the temperature coefficients of the two references compare?
Both the ADR4550ARZ-R7 and ADR4525BRZ are specified with a temperature coefficient of 2 ppm/°C maximum over the −40°C to +125°C range, according to the ADR45xx family datasheet. The A and B grades share this drift specification, so temperature stability is comparable between the two parts.
What is the output current capability of these references?
Both the ADR4550ARZ-R7 and ADR4525BRZ can source and sink output current, with the datasheet specifying output current capability in the range of ±10 mA. The exact source/sink limits and the associated output voltage regulation should be verified against the ADR45xx datasheet for the specific operating conditions.
What are the supply voltage requirements for these devices?
The ADR45xx family operates from a supply voltage that must be sufficiently above the output voltage to maintain regulation. For the ADR4550ARZ-R7 (5.000 V output), a higher supply headroom is required than for the ADR4525BRZ (2.500 V output). The minimum and maximum supply voltages should be confirmed from the ADR45xx datasheet for each specific output voltage option.
Can the ADR4525BRZ be used as a drop-in replacement for the ADR4550ARZ-R7?
No. Although both are 8-lead SOIC devices in the ADR45xx family, the ADR4525BRZ outputs 2.500 V while the ADR4550ARZ-R7 outputs 5.000 V. A drop-in replacement would change the reference voltage seen by the system, so the circuit must be redesigned or re-validated for the lower reference voltage before substitution.
What are the typical applications for these voltage references?
Both the ADR4550ARZ-R7 and ADR4525BRZ are low-noise, high-accuracy voltage references suited for precision data acquisition, industrial instrumentation, medical equipment, and high-resolution ADC/DAC reference applications. The choice between them depends primarily on the required reference voltage (5.000 V vs 2.500 V) and the system's supply headroom.