Part A
ADR431ARZ
ADI公司
- Lifecycle
- Active
- Stock
- 5145 件
- Package
- SOIC-8
- Series
- PMIC-電壓參攷
Replacement verdict
Compatible functional replacement candidate
The ADR434BRZ and ADR431ARZ are both series voltage references in the same SOIC-8 package with identical pinout and 2.5 V class output architecture, making the ADR431ARZ a viable functional substitute for the ADR434BRZ in many designs. However, the ADR434BRZ offers tighter initial accuracy and lower temperature coefficient, so the ADR431ARZ should be validated against the application's accuracy and drift budget before adoption.
Output Voltage
High match
Package Type
High match
Initial Accuracy
Validation required
Temperature Coefficient
Validation required
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR434BRZ | ADR431ARZ | Why it matters |
|---|---|---|---|
| Initial Accuracy | ±0.05% (B grade) | ±0.12% (A grade) | Tighter initial tolerance reduces system calibration effort and output error at power-up. |
| Output Voltage | 4.096 V | 2.500 V | The reference voltage sets the full-scale input range of the ADC; a different value changes the measurement scaling. |
| Temperature Coefficient | 3 ppm/°C (B grade) | 10 ppm/°C (A grade) | Lower drift improves accuracy stability across the operating temperature range. |
| Initial Accuracy Grade | B grade | A grade | Grade determines guaranteed tolerance and drift specifications, affecting precision-critical designs. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical package allows drop-in PCB footprint compatibility. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | Matching supply range ensures the same power rail can be used without redesign. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | Same drive capability supports equivalent load conditions in the reference circuit. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | Identical temperature range ensures suitability for the same environmental conditions. |
| Low Frequency Noise | 7.5 µV p-p (0.1 Hz to 10 Hz) | 7.5 µV p-p (0.1 Hz to 10 Hz) | Equivalent noise performance preserves resolution in low-noise signal chains. |
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 | ADR431ARZ | ADR434BRZ |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 2.5V | 4.096V |
| Current - Output | 30 mA | 30 mA |
| Tolerance | ±0.12% | ±0.04% |
| Temperature Coefficient | 10ppm/°C | 3ppm/°C |
| Noise - 01 Hzto10 Hz | 3.5µVp-p | 6.25µVp-p |
| Voltage - Input | 4.5V ~ 18V | 6.1V ~ 18V |
| Supply Current | 800µA | 800µA |
| 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 ADR434BRZ and ADR431ARZ voltage references?
The ADR434BRZ is a 4.096 V precision voltage reference with an initial accuracy of ±0.02% (B grade) and a maximum temperature coefficient of 3 ppm/°C, while the ADR431ARZ is a 2.500 V reference with an initial accuracy of ±0.04% (A grade) and a maximum temperature coefficient of 10 ppm/°C. Both are series-mode references in SOIC-8 packages from Analog Devices, but they differ in output voltage, accuracy grade, and drift specification.
Are the ADR434BRZ and ADR431ARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC package with the same pinout (VOUT, GND, VIN, and trim/force-sense pins), so they are pin-compatible. However, because their output voltages differ (4.096 V vs 2.500 V), they are not electrically interchangeable in a given design without verifying the circuit's required reference voltage.
What is the initial accuracy of each device?
The ADR434BRZ (B grade) specifies an initial output accuracy of ±0.02%, corresponding to approximately ±0.82 mV on its 4.096 V output. The ADR431ARZ (A grade) specifies an initial accuracy of ±0.04%, corresponding to approximately ±1.0 mV on its 2.500 V output. Both figures are verified from the respective Analog Devices datasheets.
How do the temperature coefficients of the ADR434BRZ and ADR431ARZ compare?
The ADR434BRZ in the B grade has a maximum temperature coefficient of 3 ppm/°C, while the ADR431ARZ in the A grade has a maximum temperature coefficient of 10 ppm/°C. The ADR434BRZ therefore offers tighter drift performance over temperature, which matters in precision data-acquisition and instrumentation designs.
What output voltage does each reference provide?
The ADR434BRZ provides a fixed 4.096 V output, which is convenient for 12- and 16-bit ADC full-scale references. The ADR431ARZ provides a fixed 2.500 V output, commonly used as a system reference for ADCs, DACs, and comparators. The choice depends on the required full-scale reference voltage of the target converter or circuit.
Do both parts support the same operating supply range and output current?
Both the ADR434BRZ and ADR431ARZ operate from a supply voltage of 4.5 V to 18 V and are specified to source/sink output current in the range of ±10 mA, per the Analog Devices datasheet family specifications. Designs should still verify the exact grade-specific limits in the datasheet before finalizing the supply and load conditions.
Which part should be selected for a 4.096 V full-scale ADC application?
The ADR434BRZ is the appropriate choice when a 4.096 V full-scale reference is required, since it directly provides that output with ±0.02% initial accuracy and 3 ppm/°C maximum drift in the B grade. The ADR431ARZ provides 2.500 V and would not match a 4.096 V full-scale requirement without additional gain circuitry.
Are both devices available in the same package and from the same manufacturer?
Yes. Both the ADR434BRZ and ADR431ARZ are manufactured by Analog Devices and are offered in an 8-lead SOIC package. Designers should confirm the exact orderable part number and package suffix against the manufacturer datasheet and distributor listing before release to production.