Part A
ADR4550BRZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 2013 個数
- Package
- SOIC-8
- Series
- PMIC - 電圧リファレンス
Replacement verdict
Compatible functional replacement candidate
The ADR4525ARZ and ADR4550BRZ 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 (2.5 V vs 5.0 V) and initial accuracy grade. The ADR4550BRZ is not a direct drop-in substitute for the ADR4525ARZ because the output voltage differs; substitution is only viable where the circuit is redesigned or tolerates the 5.0 V reference level, and the tighter B-grade accuracy must be validated against the target error budget.
Output Voltage
Not compatible
Package Type
High match
Initial Accuracy Grade
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4525ARZ
テキサス・インスツルメンツ
- Lifecycle
- Active
- Stock
- 4570 個数
- Package
- SOIC-8
- Series
- PMIC - 電圧リファレンス
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR4525ARZ | ADR4550BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 5.0 V | The reference voltage sets the full-scale input range of an ADC or DAC; a 2.5 V vs 5.0 V reference directly changes the system's measurement span and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.04% (max) | ±0.02% (max) | Initial accuracy determines the absolute error of the reference at room temperature; the tighter grade of the ADR4550BRZ yields lower system offset error. |
| Temperature Coefficient | 2 ppm/°C (max, A grade) | 1 ppm/°C (max, B grade) | Drift over temperature dominates total error in precision systems; the B-grade 1 ppm/°C part offers roughly half the drift of the A grade. |
| Output Noise (0.1–10 Hz) | 1.25 µV p-p/V (typ) | 2.5 µV p-p/V (typ) | Low-frequency noise limits achievable resolution in high-resolution converters; noise scales with output voltage, so the 5 V part exhibits higher absolute noise. |
| Long-Term Drift | 25 ppm/1000 h (typ) | 25 ppm/1000 h (typ) | Long-term stability affects recalibration intervals; both parts share similar drift behavior, so aging is not a differentiator here. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable supply window determines compatibility with the system rail; identical ranges mean either part fits the same power architecture. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current impacts power budget in portable or low-power designs; equal current draw means no change in power consumption. |
| Output Current Capability | ±10 mA (source/sink) | ±10 mA (source/sink) | Drive capability determines whether the reference can supply the ADC reference input and any external loads; identical ratings allow direct substitution. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package and pinout must match for board-level drop-in replacement; both use the same 8-lead SOIC footprint. |
| Operating Temperature Range | −40 °C to +125 °C | −40 °C to +125 °C | The temperature range defines the environments where the part is guaranteed to meet spec; identical ranges mean equal environmental qualification. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4550BRZ | ADR4525ARZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 5V | 2.5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.8µVp-p | 1.25µVp-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 ADR4525ARZ and ADR4550BRZ voltage references?
The ADR4525ARZ provides a 2.5 V output with ±0.02% initial accuracy (A grade), while the ADR4550BRZ provides a 5.0 V output with ±0.02% initial accuracy (B grade). Both are low-noise, high-accuracy voltage references in the same SOIC-8 package family, but they differ in output voltage, output voltage grade, and specified temperature coefficient.
Are the ADR4525ARZ and ADR4550BRZ pin-compatible?
Both devices are offered in 8-lead SOIC packages with the same pinout (VIN, VOUT, GND, TRIM, and noise-reduction/filter pins). However, because the output voltages differ (2.5 V vs 5.0 V), they are not electrically interchangeable in a given circuit without verifying that the downstream circuitry and supply headroom accommodate the different output voltage.
What is the initial accuracy of each device?
The ADR4525ARZ (A grade) has an initial accuracy of ±0.02% maximum. The ADR4550BRZ (B grade) also has an initial accuracy of ±0.02% maximum. Both are among the higher-precision grades in their respective families.
How do the temperature coefficients of the ADR4525ARZ and ADR4550BRZ compare?
The ADR4525ARZ (A grade) specifies a temperature coefficient of 2 ppm/°C maximum. The ADR4550BRZ (B grade) specifies a temperature coefficient of 2 ppm/°C maximum. Both grades offer the same guaranteed drift performance over the operating temperature range.
What are the output voltage noise characteristics of these references?
The ADR4525ARZ specifies low output voltage noise of approximately 1.25 µV p-p (0.1 Hz to 10 Hz) typical. The ADR4550BRZ specifies approximately 2.5 µV p-p (0.1 Hz to 10 Hz) typical. Noise scales with output voltage, so the 5.0 V device exhibits proportionally higher low-frequency noise than the 2.5 V device.
What supply voltage and current requirements apply to each part?
Both devices operate from a supply voltage of 3.0 V to 15 V and typically draw about 950 µA of quiescent current. The ADR4550BRZ requires sufficient supply headroom above its 5.0 V output, while the ADR4525ARZ requires headroom above 2.5 V, making the 2.5 V device usable in lower-supply-voltage systems.
Can the ADR4525ARZ be used as a drop-in replacement for the ADR4550BRZ?
No. Although both are 8-lead SOIC voltage references with similar accuracy and drift specifications, the output voltages differ (2.5 V vs 5.0 V). A replacement requires revalidation of the reference voltage, ADC/DAC full-scale range, supply headroom, and any trim or filter networks in the target design.
What are the operating temperature ranges for the ADR4525ARZ and ADR4550BRZ?
Both devices are specified over the industrial temperature range of −40°C to +125°C, supporting use in industrial instrumentation, data acquisition, and precision measurement applications.