Part A
ADR4540BRZ
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 7461 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
Replacement verdict
Compatible functional replacement candidate
The ADR4550ARZ-R7 and ADR4540BRZ are both high-precision voltage references from the same ADR45xx family, sharing identical package, pinout, and operating temperature range, making them strong functional replacement candidates. The primary distinction is the output voltage grade, so the ADR4540BRZ can serve as a drop-in substitute for the ADR4550ARZ-R7 only where the lower reference voltage and tighter initial accuracy grade are acceptable to the application.
Output Voltage
Not compatible
Package Type
High match
Initial Accuracy Grade
Validation required
Operating Temperature Range
High match
Parts at a glance
Part B
ADR4550ARZ-R7
Analog Equipment GmbH.
- Lifecycle
- Active
- Stock
- 6435 PCS
- Package
- SOIC-8
- Series
- PMIC - référence de tension
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 | ADR4540BRZ | Why it matters |
|---|---|---|---|
| Output Voltage | 5.0 V | 4.096 V | The reference voltage directly sets the full-scale input range of an ADC or DAC; a different value changes the system's measurement or output scaling. |
| Initial Accuracy | ±0.02% (A grade) | ±0.02% (B grade) | Initial accuracy determines the absolute error of the reference at room temperature and thus the uncalibrated precision of the conversion system. |
| Temperature Coefficient | 1 ppm/°C (A grade) | 2 ppm/°C (B grade) | Drift over temperature affects accuracy across the operating range; a lower tempco yields more stable performance in varying environments. |
| Output Current Capability | ±10 mA | ±10 mA | The sourcing/sinking capability determines how much load the reference can drive while maintaining regulation. |
| Supply Voltage Range | 3.0 V to 15 V | 3.0 V to 15 V | The allowable supply range must be compatible with the system rail; both parts share the same wide input range. |
| Operating Temperature Range | -40 °C to +125 °C | -40 °C to +125 °C | The temperature range defines the environments in which the reference is guaranteed to meet its specifications. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package compatibility ensures the part can be placed on the same PCB footprint without layout changes. |
| Low-Frequency Noise | 2.4 µV p-p (0.1 Hz to 10 Hz) | 2.0 µV p-p (0.1 Hz to 10 Hz) | Low-frequency noise limits the achievable resolution of high-precision converters; lower noise improves effective number of bits. |
| Long-Term Drift | 25 ppm/1000 hours | 25 ppm/1000 hours | Long-term drift affects calibration stability over the product lifetime and the need for periodic recalibration. |
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 | ADR4540BRZ | ADR4550ARZ-R7 |
|---|---|---|
| Part Status | Active | Active |
| Reference Type | Series | Series |
| Output Type | Fixed | Fixed |
| Voltage - Output (Min/Fixed) | 4.096V | 5V |
| Current - Output | 10 mA | 10 mA |
| Tolerance | ±0.02% | ±0.04% |
| Temperature Coefficient | 2ppm/°C | 4ppm/°C |
| Noise - 01 Hzto10 Hz | 2.7µVp-p | 2.8µVp-p |
| Voltage - Input | 4.2V ~ 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 the ADR4540BRZ?
The ADR4550ARZ-R7 is a 5.000 V output voltage reference with an A-grade initial accuracy of ±0.04% and a temperature coefficient of 2 ppm/°C max, supplied in a 6-lead SOIC package and provided on a 7-inch reel. The ADR4540BRZ is a 4.096 V output voltage reference with a B-grade initial accuracy of ±0.02% and a temperature coefficient of 2 ppm/°C max, supplied in a 6-lead SOIC package in tube form. The primary differences are output voltage (5.000 V vs 4.096 V), initial accuracy grade (±0.04% vs ±0.02%), and packaging format (reel vs tube).
Are the ADR4550ARZ-R7 and ADR4540BRZ pin-compatible?
Yes. Both devices are offered in the same 6-lead SOIC (R-6) package with identical pin functions: pin 1 VIN, pin 2 GND, pin 3 EN, pin 4 VOUT, pin 5 TRIM, and pin 6 VOUT_S. Because the pinout and package footprint are the same, they are pin-compatible, but the different output voltages mean they are not electrically interchangeable without design validation.
Can the ADR4540BRZ be used as a drop-in replacement for the ADR4550ARZ-R7?
No, not as a direct drop-in replacement. Although both are pin-compatible 6-lead SOIC devices, the ADR4550ARZ-R7 provides a 5.000 V output while the ADR4540BRZ provides a 4.096 V output. Substituting one for the other changes the reference voltage by approximately 0.904 V, which affects ADC/DAC full-scale ranges and system calibration. A replacement requires revalidation of the target circuit against the manufacturer datasheet.
What is the initial accuracy specification of each device?
The ADR4550ARZ-R7 (A grade) has an initial accuracy of ±0.04% maximum. The ADR4540BRZ (B grade) has an initial accuracy of ±0.02% maximum. Both specifications are stated at 25°C per the Analog Devices datasheet.
What is the temperature coefficient of the ADR4550ARZ-R7 and ADR4540BRZ?
Both the ADR4550ARZ-R7 and the ADR4540BRZ are specified with a maximum temperature coefficient of 2 ppm/°C over the −40°C to +125°C operating temperature range, according to the Analog Devices datasheet.
What are the supply voltage and current requirements for these references?
Both devices operate from a supply voltage of 3.0 V to 15 V (VIN), with a low quiescent current of approximately 950 µA typical. The ADR4550ARZ-R7 requires VIN of at least 5.2 V to regulate a 5.000 V output, while the ADR4540BRZ requires VIN of at least 4.3 V to regulate a 4.096 V output, per the Analog Devices datasheet.
What is the output current capability of the ADR4550ARZ-R7 and ADR4540BRZ?
Both devices can source and sink output current, with a specified output current capability of ±10 mA. This allows them to drive moderate reference loads while maintaining regulation, as documented in the Analog Devices datasheet.
How do the packaging formats of the ADR4550ARZ-R7 and ADR4540BRZ differ?
The ADR4550ARZ-R7 suffix "R7" indicates tape-and-reel packaging on a 7-inch reel, suitable for automated pick-and-place assembly. The ADR4540BRZ is supplied in tube packaging. Both use the same 6-lead SOIC body, so the PCB footprint is identical; only the shipping/assembly format differs.