Part A
ADR4520BRZ
ADI公司
- Lifecycle
- Active
- Stock
- 4412 件
- Package
- SOIC-8
- Series
- PMIC-電壓參攷
Replacement verdict
Compatible functional replacement candidate
The ADR4525BRZ-R7 and ADR4520BRZ are both members of the ADR4520 series of high-precision voltage references, sharing the same package, pinout, and output topology. The primary distinction is the output voltage, with the ADR4525BRZ-R7 providing 2.5 V and the ADR4520BRZ providing 2.0 V. Because the output voltage differs, the ADR4520BRZ is not a direct drop-in substitute where a 2.5 V reference is required, but it is a viable functional replacement candidate in designs that can accommodate the lower reference voltage. All other critical attributes, including package, output type, and operating temperature range, are consistent between the two parts.
Output Voltage
Validation required
Package Type
High match
Output Type
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4525BRZ-R7
ADI公司
- Lifecycle
- Active
- Stock
- 7672 件
- Package
- SOIC-8
- Series
- PMIC-電壓參攷
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR4525BRZ-R7 | ADR4520BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 2.048 V | The reference output voltage sets the full-scale value of the ADC/DAC; a different value changes the system's measurement range and scaling. |
| Initial Accuracy | ±0.02% | ±0.02% | Initial accuracy determines the absolute error of the reference at room temperature, directly affecting system precision. |
| Temperature Coefficient | 2 ppm/°C (max) | 2 ppm/°C (max) | Drift over temperature governs how stable the reference remains across the operating range, critical for high-accuracy instrumentation. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | The drive capability determines whether the reference can directly supply the load or requires buffering. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable supply range must be compatible with the system rail to ensure proper regulation and headroom. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current affects power budget, especially in low-power or battery-operated designs. |
| 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) | Low-frequency noise limits the achievable resolution of high-resolution converters and precision measurements. |
| Long-Term Drift | 25 ppm/1000 h | 25 ppm/1000 h | Long-term drift determines calibration interval and stability over the product lifetime. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility ensures the part can be dropped into the same PCB footprint without layout changes. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4520BRZ | ADR4525BRZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.048V | 2.5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.02% |
| Temperature Coefficient | 2ppm/°C | 2ppm/°C |
| Noise - 01 Hzto10 Hz | 1µVp-p | 1.25µVp-p |
| Voltage - Input | 3V ~ 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 ADR4525BRZ-R7 and the ADR4520BRZ?
The primary difference is the output voltage: the ADR4525BRZ-R7 provides a fixed 2.5 V output, while the ADR4520BRZ provides a fixed 2.0 V output. Both are members of the ADR4520/ADR4525/ADR4530/ADR4533/ADR4540/ADR4550 family of high-precision, low-noise voltage references from Analog Devices, offered in the same SOIC-8 package with the same pinout and grade (B grade, ±0.02% initial accuracy).
Are the ADR4525BRZ-R7 and ADR4520BRZ pin-compatible?
Yes. Both devices are supplied in an 8-lead SOIC package with an identical pin configuration (VOUT, GND, VIN, and TRIM/optional connections). Because the pinout and package footprint are the same, the two references are drop-in compatible on a PCB, with the only functional difference being the regulated output voltage.
What is the initial accuracy and temperature coefficient of these references?
Both the ADR4525BRZ-R7 and ADR4520BRZ are B-grade devices with ±0.02% initial output voltage accuracy and a temperature coefficient of 1 ppm/°C (typical) over the −40 °C to +125 °C operating range, per the Analog Devices ADR4520/ADR4525 datasheet.
What is the output noise performance of the ADR4525BRZ-R7 and ADR4520BRZ?
Both references feature low output noise of 1.25 µV p-p (0.1 Hz to 10 Hz) and 0.95 µV rms (10 Hz to 1 kHz), making them suitable for precision data acquisition, instrumentation, and high-resolution ADC/DAC reference applications.
What input voltage range is required for the ADR4525BRZ-R7 and ADR4520BRZ?
The ADR4520BRZ (2.0 V output) requires a minimum supply of approximately 2.7 V, while the ADR4525BRZ-R7 (2.5 V output) requires a minimum supply of approximately 3.0 V. Both devices accept input voltages up to 15 V, providing adequate headroom for the internal low-dropout regulation stage.
Can the ADR4520BRZ be used as a direct replacement for the ADR4525BRZ-R7 in an existing design?
Only if the system can tolerate a 2.0 V instead of a 2.5 V reference. The devices are pin-compatible and share the same package, grade, and noise/accuracy specifications, but the 0.5 V output difference will scale the full-scale range of any ADC or DAC using the reference. The replacement must be validated against the target design's reference voltage requirements.
What are the operating temperature and long-term stability specifications?
Both the ADR4525BRZ-R7 and ADR4520BRZ are specified over the −40 °C to +125 °C industrial temperature range and offer long-term stability of 25 ppm (typical) per 1,000 hours, supporting precision applications requiring stable references over time and temperature.