Part A
ADR4525BRZ-R7
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 7672 ПКС
- Package
- SOIC-8
- Series
- PMIC - Справочник напряжения
Replacement verdict
Compatible functional replacement candidate
The ADR4533BRZ and ADR4525BRZ-R7 are both high-precision voltage references from the same ADR45xx family, sharing an identical SOIC-8 footprint and series structure, but they differ in output voltage (3.3 V vs 2.5 V) and initial accuracy grade. The ADR4533BRZ is a viable functional replacement candidate for the ADR4525BRZ-R7 only where the 3.3 V output and tighter tolerance are acceptable; designers must confirm the output voltage change and verify the accuracy grade against their system requirements before substitution.
Output Voltage
Validation required
Package Type
High match
Initial Accuracy
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4533BRZ
Компания Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 1594 ПКС
- Package
- SOIC-8
- Series
- PMIC - Справочник напряжения
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR4533BRZ | ADR4525BRZ-R7 | Why it matters |
|---|---|---|---|
| Output Voltage | 3.3 V | 2.5 V | The nominal reference voltage directly sets the system's full-scale range; a 3.3 V vs 2.5 V reference changes ADC/DAC scaling and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.02% (B grade) | ±0.02% (B grade) | Initial accuracy determines the absolute error at room temperature; matching grades ensure comparable uncalibrated precision. |
| Temperature Coefficient | 2 ppm/°C (max) | 2 ppm/°C (max) | Drift over temperature governs accuracy across the operating range; identical tempco means similar stability behavior. |
| Output Current Capability | ±10 mA | ±10 mA | Source/sink current 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 input supply range affects compatibility with the system rail and headroom requirements. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The rated temperature range confirms suitability for industrial/extended environments. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility ensures the part can drop into the same PCB footprint. |
| 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) | Noise floor limits achievable resolution in precision measurement systems; matching noise preserves performance. |
| Long-Term Drift | 25 ppm/1000 h | 25 ppm/1000 h | Long-term drift affects calibration intervals and lifetime accuracy in instrumentation. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4525BRZ-R7 | ADR4533BRZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V | 3.3V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.02% |
| Temperature Coefficient | 2ppm/°C | 2ppm/°C |
| Noise - 01 Hzto10 Hz | 1.25µVp-p | 2.1µVp-p |
| Voltage - Input | 3V ~ 15V | 3.4V ~ 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 ADR4533BRZ and ADR4525BRZ-R7?
The ADR4533BRZ provides a 3.3 V output, while the ADR4525BRZ-R7 provides a 2.5 V output. Both are members of Analog Devices' ADR45xx family of high-accuracy, low-noise voltage references in an 8-lead SOIC package, but they differ in output voltage and initial accuracy grade. The ADR4533BRZ is specified with ±0.02% initial accuracy (B grade), and the ADR4525BRZ-R7 is also a B-grade device with ±0.02% initial accuracy at 2.5 V. The "-R7" suffix on the ADR4525BRZ-R7 denotes tape-and-reel packaging.
Are the ADR4533BRZ and ADR4525BRZ-R7 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with the same pinout, so they are pin-compatible. However, because their output voltages differ (3.3 V vs. 2.5 V), they are not electrically interchangeable in a given circuit without verifying that the downstream system tolerates the different reference voltage.
What is the initial accuracy of each device?
Both the ADR4533BRZ and ADR4525BRZ-R7 are B-grade references with a specified initial accuracy of ±0.02% maximum. This corresponds to approximately ±0.66 mV at 3.3 V for the ADR4533BRZ and ±0.5 mV at 2.5 V for the ADR4525BRZ-R7.
How do the temperature coefficients of the ADR4533BRZ and ADR4525BRZ-R7 compare?
Both B-grade devices are specified with a maximum temperature coefficient of 2 ppm/°C over the -40°C to +125°C operating range, per the Analog Devices ADR45xx datasheet. The temperature coefficient performance is therefore equivalent between the two parts.
What is the difference between the ADR4525BRZ and the ADR4525BRZ-R7 ordering code?
The ADR4525BRZ-R7 is the tape-and-reel version of the ADR4525BRZ. The "-R7" suffix indicates 7-inch reel packaging, typically 500 or 1,000 units per reel depending on the manufacturer's standard. The electrical specifications of the device are identical; only the shipping packaging differs.
Can the ADR4533BRZ be used as a drop-in replacement for the ADR4525BRZ-R7?
Not as a direct electrical drop-in replacement. Although both are pin-compatible 8-lead SOIC devices, the ADR4533BRZ outputs 3.3 V while the ADR4525BRZ-R7 outputs 2.5 V. A replacement requires verifying that the target circuit's supply headroom, ADC/DAC reference input range, and system calibration accommodate the higher 3.3 V reference.
What are the supply voltage requirements for these references?
Both the ADR4533BRZ and ADR4525BRZ-R7 operate from a supply voltage of 3.0 V to 15 V, per the ADR45xx datasheet. Note that for the ADR4533BRZ, the supply must be at least 3.0 V, which provides adequate headroom above the 3.3 V output only when the supply is above approximately 3.4 V in practice; designers should confirm dropout headroom from the datasheet's specified minimum supply voltage for the 3.3 V option.
What is the output noise performance of the ADR4533BRZ and ADR4525BRZ-R7?
Both devices are low-noise references. Per the Analog Devices ADR45xx datasheet, the output voltage noise is typically 1.25 µV p-p (0.1 Hz to 10 Hz) and approximately 2.4 µV rms (10 Hz to 1 kHz) for the 2.5 V option, with comparable low-noise performance for the 3.3 V option. Designers should consult the specific datasheet revision for the exact noise specification of each voltage option.