Part A
ADR4533ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 3692 PCS
- Package
- SOIC-8
- Series
- PMIC - Referência à Voltação
Replacement verdict
Compatible functional replacement candidate
The ADR4520ARZ and ADR4533ARZ share the same series architecture, package, and pinout, making them functionally interchangeable in layout terms, but their differing output voltages mean the ADR4533ARZ cannot directly replace the ADR4520ARZ without validating the target circuit's voltage requirements. Designers should confirm the required reference voltage and associated tolerance budget before substituting one for the other.
Output Voltage
Not compatible
Package Type
High match
Initial Accuracy
High match
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4520ARZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 2343 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 | ADR4520ARZ | ADR4533ARZ | Why it matters |
|---|---|---|---|
| Output Voltage | 2.048 V | 3.3 V | The nominal reference voltage must match the system's ADC/DAC full-scale requirement; these parts cannot be substituted without redesigning the signal chain. |
| Initial Accuracy | ±0.02% | ±0.02% | Initial tolerance directly affects absolute measurement accuracy at room temperature before calibration. |
| Temperature Coefficient | 2 ppm/°C (max) | 2 ppm/°C (max) | Low tempco ensures the reference remains stable over the operating temperature range, critical for precision instrumentation. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | Determines the load the reference can drive while maintaining regulation, affecting buffering requirements. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | Must be compatible with the available system rail; both share the same headroom requirements. |
| Supply Current | 950 µA (typ) | 950 µA (typ) | Quiescent current impacts power budget in low-power and portable designs. |
| Low-Frequency Noise | 1.25 µV p-p (0.1 Hz to 10 Hz) | 1.25 µV p-p (0.1 Hz to 10 Hz) | Low noise is essential for high-resolution converters and precision measurement resolution. |
| Long-Term Drift | 25 ppm/1000 hr | 25 ppm/1000 hr | Long-term stability affects recalibration intervals and lifetime accuracy of the system. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Identical footprint allows drop-in PCB compatibility if the voltage requirement is adjusted. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR4533ARZ | ADR4520ARZ |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 3.3V | 2.048V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.04% | ±0.04% |
| Temperature Coefficient | 4ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.1µVp-p | 1µVp-p |
| Voltage - Input | 3.4V ~ 15V | 3V ~ 15V |
| Supply Current | 950µA | 950µA |
| 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 ADR4520ARZ and ADR4533ARZ voltage references?
The ADR4520ARZ provides a fixed 2.048 V output, while the ADR4533ARZ provides a fixed 3.3 V output. Both are members of the ADR4520/ADR4533 family of high-precision, low-noise voltage references from Analog Devices, offered in an 8-lead SOIC package (R suffix) with an operating temperature range of −40 °C to +125 °C. The primary difference is the nominal output voltage, which determines the appropriate choice for a given ADC full-scale range or system reference rail.
What initial accuracy and temperature coefficient do the ADR4520ARZ and ADR4533ARZ specify?
Both devices are specified with an initial accuracy of ±0.02% maximum and a temperature coefficient of 2 ppm/°C maximum (A grade) over the −40 °C to +125 °C range, per the Analog Devices ADR4520/ADR4533 datasheet. These specifications are identical between the two parts; only the output voltage differs.
What output noise and long-term drift are specified for these references?
The ADR4520/ADR4533 family specifies low-frequency output noise of 1.25 µV p-p (0.1 Hz to 10 Hz) typical and long-term drift of 25 ppm typical per 1000 hours, as stated in the Analog Devices datasheet. These noise and drift figures apply to both the ADR4520ARZ and ADR4533ARZ.
Are the ADR4520ARZ and ADR4533ARZ pin-compatible?
Yes. Both parts are offered in the same 8-lead SOIC package (R suffix) with the same pinout, so they are pin-compatible. However, because the output voltage differs (2.048 V vs. 3.3 V), a direct substitution requires verifying that the downstream circuit, such as an ADC reference input or comparator threshold, is valid at the new output voltage.
What supply voltage and output current capability do these references support?
Both the ADR4520ARZ and ADR4533ARZ operate from a supply voltage of 3.0 V to 15 V and can source/sink output current up to 10 mA, per the Analog Devices datasheet. The ADR4533ARZ requires a supply voltage at least equal to its 3.3 V output plus dropout, so a 3.0 V minimum supply applies only where the output can regulate; verify headroom in the target design.
Which applications favor the ADR4520ARZ versus the ADR4533ARZ?
The ADR4520ARZ (2.048 V) is commonly selected for 12- to 16-bit ADCs whose full-scale input is 2.048 V or 4.096 V, and for systems requiring a binary-weighted reference. The ADR4533ARZ (3.3 V) suits 3.3 V rail systems and ADCs or DACs with a 3.3 V full-scale range. Selection should be based on the required reference voltage of the converter or measurement chain, not on accuracy or noise, which are equivalent across the family.
Do the ADR4520ARZ and ADR4533ARZ share the same package and qualification grade?
Yes. Both are supplied in the 8-lead SOIC (R) package and are specified over the industrial temperature range of −40 °C to +125 °C. The "ARZ" suffix denotes the SOIC package and the A-grade accuracy/temperature-coefficient specification, which is common to both part numbers per the Analog Devices datasheet.