Part A
ADR431BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2196 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Not a drop-in replacement
The ADR431BRZ and ADR434AR-REEL7 are not drop-in replacements for one another. The ADR431BRZ is a 2.5 V precision voltage reference in an SOIC-8 package with a tight 0.04% initial accuracy and 3 ppm/°C temperature coefficient, while the ADR434AR-REEL7 is a 4.096 V reference in an SOIC-8 package with 0.04% initial accuracy and 3 ppm/°C temperature coefficient. The differing output voltage, output current capability, and long-term drift characteristics mean the two parts serve distinct reference requirements and cannot be substituted without circuit redesign and validation.
Different output voltage
Different output current
Different long-term drift
Different noise performance
Parts at a glance
Part B
ADR434AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 178 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
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 | ADR434AR-REEL7 | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 4.096 V | The reference voltage sets the full-scale value of the ADC/DAC; a different output voltage changes the system's measurement range and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.04% (max) | ±0.13% (max) | Initial accuracy determines the absolute error of the reference at room temperature; tighter accuracy reduces system calibration effort and measurement error. |
| Temperature Coefficient | 3 ppm/°C (max) | 10 ppm/°C (max) | Drift over temperature directly affects accuracy across the operating range; a lower tempco yields more stable performance in precision applications. |
| Output Current Capability | 30 mA (source/sink) | 10 mA (source/sink) | The load current the reference can supply limits how many or how heavily loaded the downstream converters can be driven directly. |
| Output Noise (0.1–10 Hz) | 3.4 µV p-p (typ) | 6.25 µV p-p (typ) | Low-frequency noise limits the achievable resolution of high-resolution converters; lower noise supports better effective number of bits. |
| Supply Voltage Range | 4.5 V to 18 V | 4.5 V to 18 V | The allowable supply range must accommodate the system rail; both share the same range, easing supply design compatibility. |
| Supply Current | 800 µA (typ) | 800 µA (typ) | Quiescent current affects total power budget in low-power designs; identical values mean comparable power impact. |
| Long-Term Drift | 25 ppm/1000 h (typ) | 25 ppm/1000 h (typ) | Long-term stability determines recalibration intervals; matching drift simplifies maintenance planning. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility affects PCB footprint and assembly; identical packages allow drop-in layout reuse. |
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 | ADR434AR-REEL7 |
|---|---|---|
| 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 key differences between the ADR431BRZ and ADR434AR-REEL7 voltage references?
The ADR431BRZ is a 2.500 V precision voltage reference in an 8-lead SOIC package with an initial accuracy grade of B (±0.04% or ±1 mV typical) and a low temperature coefficient of 3 ppm/°C (max). The ADR434AR-REEL7 is a 4.096 V precision voltage reference in an 8-lead SOIC package supplied on tape and reel, with an A-grade initial accuracy of ±0.1% and a temperature coefficient of 8 ppm/°C (max). The primary differences are output voltage (2.500 V vs 4.096 V), accuracy grade (B vs A), and temperature coefficient specification.
Are the ADR431BRZ and ADR434AR-REEL7 pin-compatible?
Both devices are offered in the same 8-lead SOIC (R-8) package footprint, so the pin assignments and PCB land pattern are compatible. However, because the output voltages differ (2.500 V vs 4.096 V), they are not electrically interchangeable in a given circuit without verifying that the system tolerates the different reference voltage.
What output voltage does each device provide?
The ADR431BRZ provides a fixed 2.500 V output. The ADR434AR-REEL7 provides a fixed 4.096 V output. The 4.096 V value of the ADR434 is chosen to simplify binary-weighted ADC and DAC scaling (4.096 V = 2^12 mV).
How do the initial accuracy and temperature coefficient specifications compare?
The ADR431BRZ (B grade) offers tighter initial accuracy and a lower temperature coefficient than the ADR434AR-REEL7 (A grade). The ADR431B is specified at ±0.04% initial accuracy with 3 ppm/°C max tempco, while the ADR434A is specified at ±0.1% initial accuracy with 8 ppm/°C max tempco. Designs requiring tighter reference precision should account for these grade differences.
What is the difference between the packaging options of these two parts?
The ADR431BRZ is supplied in standard tube/rail packaging in the 8-lead SOIC (R-8) package. The ADR434AR-REEL7 suffix indicates tape-and-reel packaging (7-inch reel) for automated pick-and-place assembly. Both use the same 8-lead SOIC body; only the shipping format differs.
Can the ADR434AR-REEL7 be used as a drop-in replacement for the ADR431BRZ?
No. Although both are 8-lead SOIC devices with compatible footprints, the output voltages differ (4.096 V vs 2.500 V) and the accuracy grades differ (A vs B). A drop-in replacement would change the reference voltage presented to the load, so the circuit must be redesigned or revalidated for the new output voltage and accuracy before substitution.
What are typical applications for each reference?
The ADR431BRZ (2.500 V, high accuracy, low tempco) is suited to precision data acquisition, high-resolution ADCs/DACs, and instrumentation where a 2.5 V reference is required. The ADR434AR-REEL7 (4.096 V) is commonly used with 12-bit and higher ADCs/DACs where the 4.096 V full-scale value simplifies digital code scaling, and its tape-and-reel format suits high-volume automated assembly.