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 ADR4550ARZ-R7 and ADR4533ARZ are both high-precision voltage references from the same ADR45xx family, sharing identical package, pinout, and output topology, but they differ in output voltage and initial accuracy grade. The ADR4550ARZ-R7 provides a 5.0 V output while the ADR4533ARZ provides a 3.3 V output, so the two are not electrically interchangeable in a fixed-voltage design without verifying the reference voltage required by the downstream circuitry. Where the system can accommodate a different reference value or where the reference is scaled externally, the ADR4533ARZ may serve as a functional substitute; otherwise, validation of the target voltage and accuracy budget is required before substitution.
Output Voltage
Not compatible
Package Type
High match
Pin Configuration
High match
Initial Accuracy Grade
Validation required
Parts at a glance
Part B
ADR4550ARZ-R7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 6435 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 | ADR4550ARZ-R7 | ADR4533ARZ | Why it matters |
|---|---|---|---|
| Output Voltage | 5.000 V | 3.300 V | The nominal reference voltage directly sets the system's full-scale range; a 5 V vs 3.3 V difference makes them non-interchangeable without redesigning the signal chain. |
| Initial Accuracy | ±0.02% (max) | ±0.02% (max) | Initial accuracy determines the untrimmed error at room temperature; identical accuracy means comparable precision without calibration. |
| Temperature Coefficient | 2 ppm/°C (max) | 2 ppm/°C (max) | Drift over temperature dominates total error in precision systems; matching tempco ensures similar stability across the operating range. |
| Output Current Capability | ±10 mA | ±10 mA | Source/sink current determines the load the reference can drive directly; equal capability means similar buffering requirements. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable input supply range affects compatibility with the system rail; identical ranges allow the same supply design. |
| Operating Temperature Range | -40°C to +125°C | -40°C to +125°C | The rated temperature span defines the environments where specifications hold; matching ranges ensure equivalent ruggedness. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package and pinout determine board footprint and drop-in compatibility; identical packages simplify substitution. |
| Low-Frequency Noise | 2.4 µV p-p (0.1 Hz to 10 Hz) | 2.4 µV p-p (0.1 Hz to 10 Hz) | Low-frequency noise limits resolution in high-precision converters; equal noise performance preserves achievable accuracy. |
| Long-Term Drift | 25 ppm/1000 hr | 25 ppm/1000 hr | Long-term drift affects calibration intervals and lifetime accuracy; matching drift means comparable maintenance requirements. |
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 | ADR4533ARZ | ADR4550ARZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 3.3V | 5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.04% | ±0.04% |
| Temperature Coefficient | 4ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.1µVp-p | 2.8µVp-p |
| Voltage - Input | 3.4V ~ 15V | 5.1V ~ 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 ADR4550ARZ-R7 and ADR4533ARZ voltage references?
The ADR4550ARZ-R7 provides a fixed 5.000 V output, while the ADR4533ARZ provides a fixed 3.300 V output. Both are members of Analog Devices' ADR45xx family of low-noise, high-accuracy voltage references in an 8-lead SOIC package, but they differ in output voltage, initial accuracy grade, and temperature coefficient specifications.
What initial accuracy and temperature coefficient do these references specify?
The ADR4550ARZ-R7 (A grade) specifies ±0.04% initial accuracy and 2 ppm/°C maximum temperature coefficient. The ADR4533ARZ (A grade) specifies ±0.04% initial accuracy and 2 ppm/°C maximum temperature coefficient. Both are A-grade devices, so accuracy and drift specifications are comparable; the primary difference is the output voltage.
Are the ADR4550ARZ-R7 and ADR4533ARZ pin-compatible?
Yes. Both devices are offered in the same 8-lead SOIC (R-8) package with identical pin functions, including VIN, VOUT, GND, TRIM, and noise-reduction/filter pins. This allows a common PCB footprint, but the output voltage difference must be validated against the target design before substitution.
What are the input voltage and operating temperature ranges for these references?
Both the ADR4550ARZ-R7 and ADR4533ARZ operate from a supply voltage of 3.0 V to 15 V (the ADR4550 requires VIN at least 0.5 V above VOUT, i.e., ≥5.5 V for a 5 V output). Both are specified over the −40°C to +125°C industrial temperature range.
How do the noise and long-term drift specifications compare?
Both devices are low-noise references in the ADR45xx family, with typical 0.1 Hz to 10 Hz noise of 2.5 µV p-p and long-term drift of approximately 25 ppm per 1000 hours. These specifications are common to the family and do not differ materially between the 5.000 V and 3.300 V versions.
Can the ADR4533ARZ be used as a drop-in replacement for the ADR4550ARZ-R7?
No, not as a direct drop-in replacement. Although the package and pinout are identical, the output voltage differs (3.300 V versus 5.000 V). A substitution requires revalidation of the system's reference voltage, ADC/DAC full-scale range, and any associated gain or threshold calculations.
What output current can these references source or sink?
Both the ADR4550ARZ-R7 and ADR4533ARZ can source and sink output current, with specified output current capability of ±10 mA. This supports driving moderate loads such as ADC reference inputs and buffered signal chains without external buffering.
What is the package and ordering information for these parts?
Both devices are supplied in an 8-lead SOIC package. The ADR4550ARZ-R7 is provided in 7-inch reel packaging (suffix -R7), while the ADR4533ARZ is supplied in standard tube or reel packaging per the ordering code. Designers should confirm the exact packaging suffix against the manufacturer's ordering guide for production planning.