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 ADR435AR-REEL7 are both precision voltage references from the same ADR43x family, sharing a common SOIC-8 footprint and series-mode topology, but they differ in output voltage and initial accuracy grade. The ADR431BRZ offers a 2.500 V output with tighter B-grade tolerance, while the ADR435AR-REEL7 provides a 5.000 V output at A-grade accuracy. Because the output voltage differs, the ADR435AR-REEL7 is not a direct drop-in substitute for the ADR431BRZ in circuits designed around a 2.5 V reference; substitution requires validation of the target system's reference voltage requirements, accuracy budget, and thermal drift tolerance before adoption.
Output Voltage
Not compatible
Initial Accuracy Grade
Validation required
Package Type
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR435AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 8130 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 | ADR435AR-REEL7 | Why it matters |
|---|---|---|---|
| Initial Accuracy | ±0.04% (max) | ±0.12% (max) | Tighter initial accuracy reduces or eliminates the need for system calibration and directly affects output voltage error at room temperature. |
| Output Voltage | 2.500 V | 5.000 V | The nominal reference voltage must match the ADC/DAC full-scale requirement; these parts are not directly interchangeable without redesigning the signal chain. |
| Temperature Coefficient | 3 ppm/°C (max) | 10 ppm/°C (max) | Drift over temperature determines reference stability in precision measurement systems; lower tempco yields better accuracy across the operating range. |
| Initial Accuracy Grade | B grade | A grade | The grade suffix indicates the manufacturer's accuracy/tempco binning, so substituting across grades changes guaranteed performance limits. |
| Output Current Capability | 30 mA (source/sink) | 30 mA (source/sink) | Drive capability determines whether the reference can supply the load directly or requires buffering; identical here, so load driving is equivalent. |
| Supply Voltage Range | 4.5 V to 18 V | 7.0 V to 18 V | The minimum supply headroom differs because of the higher 5 V output; a 5 V system supply cannot power the ADR435AR-REEL7. |
| Output Noise (0.1 Hz to 10 Hz) | 3.4 µV p-p (typ) | 8.0 µV p-p (typ) | Low-frequency noise limits resolution in high-resolution converters; lower noise improves effective number of bits in precision systems. |
| Long-Term Drift | 25 ppm/1000 h (typ) | 25 ppm/1000 h (typ) | Long-term stability affects recalibration intervals; identical values mean comparable aging behavior over the product lifetime. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility determines whether a drop-in board replacement is possible; identical packages simplify substitution. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The rated temperature range must cover the application environment; identical ranges mean equivalent environmental qualification. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR431BRZ | ADR435AR-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 ADR435AR-REEL7 voltage references?
The ADR431BRZ is a 2.500 V precision voltage reference in an 8-lead SOIC package with a B-grade initial accuracy of ±0.04% and a specified temperature coefficient of 3 ppm/°C max. The ADR435AR-REEL7 is a 5.000 V reference in an 8-lead SOIC package with an A-grade initial accuracy of ±0.12% and a temperature coefficient of 10 ppm/°C max. The primary differences are output voltage (2.5 V vs 5.0 V), accuracy grade, and temperature drift specification.
Are the ADR431BRZ and ADR435AR-REEL7 pin-compatible?
Both devices are offered in the same 8-lead SOIC package (R-8 suffix) with the same pin functions, including VOUT, VIN, 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 system can accept the different reference voltage.
What is the initial accuracy of each device?
The ADR431BRZ (B grade) has an initial accuracy of ±0.04% maximum at 25°C, corresponding to ±1 mV on the 2.500 V output. The ADR435AR-REEL7 (A grade) has an initial accuracy of ±0.12% maximum at 25°C, corresponding to ±6 mV on the 5.000 V output.
How do the temperature coefficients of the ADR431BRZ and ADR435AR-REEL7 compare?
The ADR431BRZ is specified with a maximum temperature coefficient of 3 ppm/°C over the −40°C to +125°C range. The ADR435AR-REEL7 is specified with a maximum temperature coefficient of 10 ppm/°C over the same temperature range. The ADR431BRZ therefore offers tighter drift performance.
What are the output voltage options and package formats?
The ADR431BRZ provides a fixed 2.500 V output in an 8-lead SOIC tube/rail format. The ADR435AR-REEL7 provides a fixed 5.000 V output in an 8-lead SOIC supplied on a 7-inch tape-and-reel (REEL7) for automated assembly. Both are fixed-output references from the ADR43x family.
Can the ADR431BRZ be used as a drop-in replacement for the ADR435AR-REEL7?
No. Although both share the same 8-lead SOIC footprint and pin functions, the output voltages differ (2.500 V vs 5.000 V). A direct substitution would change the reference voltage presented to the downstream ADC or DAC, so the design must be revalidated for the new output voltage, accuracy grade, and drift specification before substitution.
What are the operating temperature ranges and supply requirements for these references?
Both the ADR431BRZ and ADR435AR-REEL7 are specified over the −40°C to +125°C industrial temperature range. Both require a supply voltage above the output voltage plus dropout; the ADR435AR-REEL7 (5.0 V output) requires a higher minimum supply than the ADR431BRZ (2.5 V output). Consult the respective manufacturer datasheets for exact minimum supply and quiescent current specifications.