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 ADR431ARZ 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 ADR435AR-REEL7 can serve as a functional substitute for the ADR431ARZ only where the higher 5.0 V reference and the looser A-grade tolerance are acceptable; designers must revalidate the reference voltage, accuracy budget, and thermal drift in the target circuit before committing to the swap.
Output Voltage
Validation required
Initial Accuracy
Validation required
Package Type
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR435AR-REEL7
ADI公司
- Lifecycle
- Active
- Stock
- 8130 件
- Package
- SOIC-8
- Series
- PMIC-電壓參攷
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR431ARZ | ADR435AR-REEL7 | Why it matters |
|---|---|---|---|
| Output Voltage | 2.5 V | 5.0 V | The nominal reference voltage determines the full-scale range of the ADC/DAC and the system supply headroom; a 2.5 V and 5.0 V reference are not directly interchangeable without redesigning the signal chain. |
| Initial Accuracy | ±0.12% (max) | ±0.12% (max) | Initial accuracy sets the absolute error of the reference at 25°C and directly contributes to overall system gain error; both parts share the same grade here. |
| Temperature Coefficient | 10 ppm/°C (max) | 10 ppm/°C (max) | Drift over temperature dominates reference error in precision systems; matching tempco means both parts behave similarly across the operating range. |
| Output Current Capability | 30 mA (source/sink) | 30 mA (source/sink) | Drive capability determines whether the reference can supply the load directly or needs a buffer; identical ratings support similar loading. |
| Supply Voltage Range | 4.5 V to 18 V | 7.0 V to 18 V | The minimum supply headroom differs because the 5.0 V output requires more headroom; a 5 V rail cannot power the ADR435, affecting board-level compatibility. |
| Supply Current | 800 µA (typ) | 800 µA (typ) | Quiescent current affects power budget in low-power and portable designs; equal consumption means no power penalty when substituting. |
| 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; the ADR431 offers lower noise, which matters for precision measurement applications. |
| Long-Term Drift | 25 ppm/1000 h (typ) | 25 ppm/1000 h (typ) | Long-term stability affects calibration intervals and lifetime accuracy; matching drift means comparable maintenance requirements. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility determines whether a drop-in replacement is possible on an existing PCB footprint; identical packages simplify substitution. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR431ARZ | 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 | ±0.12% | - |
| Temperature Coefficient | 10ppm/°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 ADR431ARZ and ADR435AR-REEL7 voltage references?
The ADR431ARZ is a 2.500 V precision voltage reference in an 8-lead SOIC package, while the ADR435AR-REEL7 is a 5.000 V precision voltage reference in an 8-lead SOIC package supplied on tape and reel. Both are members of Analog Devices' ADR43x XFET family with initial accuracy grades of ±0.12% (A grade) and low temperature drift, but they differ in output voltage and packaging format.
Are the ADR431ARZ and ADR435AR-REEL7 pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, including VOUT, VIN, GND, TRIM, and noise-reduction pins. However, because their output voltages differ (2.500 V vs 5.000 V), they are not electrically interchangeable in a given design without verifying the system's reference voltage requirements.
What initial accuracy and temperature coefficient do these references specify?
Both the ADR431ARZ and ADR435AR-REEL7 are A-grade devices with ±0.12% initial accuracy and a temperature coefficient of 10 ppm/°C maximum over the −40°C to +125°C operating range, per Analog Devices ADR43x datasheet specifications.
What is the difference between the packaging of the ADR431ARZ and ADR435AR-REEL7?
The ADR431ARZ is supplied in tube or tray format as a standard 8-lead SOIC device, while the ADR435AR-REEL7 suffix indicates tape-and-reel packaging (7-inch reel) intended for automated pick-and-place assembly. The electrical performance of the die is the same; only the shipping format differs.
Can the ADR435AR-REEL7 be used as a drop-in replacement for the ADR431ARZ?
No, not as a direct drop-in replacement. Although both share the same 8-lead SOIC footprint and pinout, the ADR431ARZ provides a 2.500 V output while the ADR435AR-REEL7 provides 5.000 V. Substitution requires verifying that the target circuit accepts the different reference voltage and that load, trim, and noise specifications remain within design limits.
What are the supply voltage and operating current specifications for these references?
Both the ADR431ARZ and ADR435AR-REEL7 operate from a supply voltage of 4.5 V to 18 V for the 2.5 V version and 7.0 V to 18 V for the 5.0 V version, with a typical quiescent supply current of 800 µA. These values are specified in the Analog Devices ADR43x datasheet.
What output noise performance do the ADR431ARZ and ADR435AR-REEL7 offer?
Both devices specify low output noise of 3.4 µV p-p (0.1 Hz to 10 Hz) typical, making them suitable for precision data acquisition and instrumentation applications. The noise specification is common across the ADR43x family per the manufacturer datasheet.