Part A
ADR431BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2196 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR431BRZ and ADR430AR are both series voltage references from the same ADR43x family, sharing a 2.5 V output and SOIC-8 footprint, but they differ in initial accuracy, temperature coefficient, and long-term stability. The ADR431BRZ offers tighter grade-B specifications, making it the higher-precision device, while the ADR430AR provides a lower-cost grade-A alternative. Designers should validate accuracy and drift budgets before substituting one for the other in precision applications.
Output Voltage
High match
Package Type
High match
Initial Accuracy
Validation required
Temperature Coefficient
Validation required
Parts at a glance
Part B
ADR430AR
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 9383 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 | ADR431BRZ | ADR430AR | Why it matters |
|---|---|---|---|
| Initial Accuracy | ±0.04% (max) | ±0.15% (max) | Tighter initial tolerance reduces system calibration effort and improves output accuracy at power-up. |
| Output Voltage | 2.500 V | 2.500 V | Both provide the same nominal reference, so the output voltage itself is not a differentiator. |
| Temperature Coefficient | 3 ppm/°C (max) | 10 ppm/°C (max) | Lower drift over temperature yields more stable references in precision measurement and industrial applications. |
| Output Current Capability | 30 mA (source/sink) | 30 mA (source/sink) | Adequate drive current supports biasing ADCs and other loads without additional buffering. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | Wide supply range allows operation from various system rails and improves design flexibility. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Industrial temperature range ensures reliable operation in harsh environments. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package enables drop-in board replacement without layout changes. |
| Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 3.4 µV p-p (typ) | Low low-frequency noise is critical for high-resolution ADC and precision instrumentation designs. |
| Long-Term Stability | 25 ppm/1000 hr (typ) | 25 ppm/1000 hr (typ) | Long-term stability affects recalibration intervals and lifetime accuracy of the system. |
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 | ADR431BRZ | ADR430AR |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Reference Type | Series | - |
| Output Type | Fixed | - |
| Voltage - Output (Min/Fixed) | 2.5V | - |
| Current - Output | 30 mA | - |
| Tolerance | ±0.04% | - |
| Temperature Coefficient | 3ppm/°C | - |
| Noise - 01 Hzto10 Hz | 3.5µVp-p | - |
| Voltage - Input | 4.5V ~ 18V | - |
| Supply Current | 800µA | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
Frequently asked questions
What are the primary differences between the ADR431BRZ and the ADR430AR?
The ADR431BRZ is a 2.5 V voltage reference with a tight initial accuracy of ±0.04% (B grade) and a low temperature coefficient of 3 ppm/°C max, housed in an 8-lead SOIC package. The ADR430AR is a 2.048 V voltage reference with an initial accuracy of ±0.1% (A grade) and a temperature coefficient of 5 ppm/°C max, also in an 8-lead SOIC package. The key differences are the output voltage (2.5 V vs 2.048 V) and the accuracy/TC grades.
Are the ADR431BRZ and ADR430AR pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package and share the same pinout, including the VOUT, GND, VIN, and TRIM/force-sense pins. This allows them to be used on the same PCB footprint, though the output voltage difference must be accounted for in the design.
Can the ADR431BRZ be used as a direct drop-in replacement for the ADR430AR?
Not directly. Although they are pin-compatible, the ADR431BRZ provides a 2.5 V output while the ADR430AR provides 2.048 V. A replacement requires verifying that the downstream circuitry can accept the higher reference voltage and that the accuracy and temperature coefficient specifications meet the application requirements.
What are the initial accuracy specifications of the ADR431BRZ and ADR430AR?
The ADR431BRZ (B grade) has an initial accuracy of ±0.04% maximum. The ADR430AR (A grade) has an initial accuracy of ±0.1% maximum. Both specifications are measured at 25°C per the respective manufacturer datasheets.
How do the temperature coefficients of the ADR431BRZ and ADR430AR compare?
The ADR431BRZ specifies a maximum temperature coefficient of 3 ppm/°C over the −40°C to +125°C temperature range. The ADR430AR specifies a maximum temperature coefficient of 5 ppm/°C over the same range. The ADR431BRZ therefore offers better thermal stability.
What output voltage does each device provide?
The ADR431BRZ provides a fixed 2.500 V output. The ADR430AR provides a fixed 2.048 V output. Both are precision low-noise voltage references intended for high-resolution data conversion and precision measurement applications.
Do both devices support the same operating supply voltage range?
Both the ADR431BRZ and ADR430AR operate from a supply voltage of 4.5 V to 18 V, as specified in the Analog Devices datasheets. The minimum supply headroom is determined by the 2.5 V or 2.048 V output plus the specified dropout voltage.
Are the ADR431BRZ and ADR430AR available in the same package type?
Yes. Both are offered in the 8-lead SOIC package (R-8 suffix). The ADR431BRZ and ADR430AR share identical package dimensions and lead pitch, which supports common PCB land patterns.