Part A
ADR425BRZ
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 4942 Stückzahl
- Package
- SOIC-8
- Series
- PMIC Spannung Referenz
Replacement verdict
Compatible functional replacement candidate
The ADR425BRZ and ADR420AR-REEL7 are both precision voltage references from the same ADR42x family, sharing a common SOIC-8 footprint and series-mode topology, but they differ in output voltage, initial accuracy, and temperature coefficient grade. The ADR425BRZ offers a 5.000 V output with tighter B-grade accuracy, while the ADR420AR-REEL7 provides a 2.048 V output at A-grade tolerance, so substitution is only viable where the system can accommodate the different reference voltage and the relaxed accuracy budget.
Output Voltage
Validation required
Initial Accuracy
Validation required
Temperature Coefficient
Validation required
Package Type
High match
Parts at a glance
Part B
ADR420AR-REEL7
Analog Devices Inc.
- Lifecycle
- Active
- Stock
- 5100 Stückzahl
- Package
- SOIC-N-8
- Series
- PMIC Spannung Referenz
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | ADR425BRZ | ADR420AR-REEL7 | Why it matters |
|---|---|---|---|
| Output Voltage | 5.0 V | 2.048 V | The reference voltage sets the full-scale input range of an ADC or the output span of a DAC; a different value changes the system's signal scaling and cannot be substituted without recalibration. |
| Initial Accuracy | ±0.04% (B grade) | ±0.15% (A grade) | Initial accuracy determines the absolute error of the reference at room temperature; tighter accuracy reduces system calibration effort and measurement uncertainty. |
| Temperature Coefficient | 3 ppm/°C (B grade) | 10 ppm/°C (A grade) | Drift over temperature directly affects accuracy across the operating range; a lower tempco yields more stable performance in precision applications. |
| Output Current Capability | 10 mA (source/sink) | 10 mA (source/sink) | The available drive current determines whether the reference can directly supply a load or must be buffered; both parts share the same capability here. |
| Supply Voltage Range | 7 V to 18 V | 4.5 V to 18 V | The minimum supply headroom must exceed the output voltage plus dropout; the 5 V part requires a higher minimum supply than the 2.048 V part. |
| Supply Current | 0.5 mA typ | 0.5 mA typ | Quiescent current impacts power budget in portable and low-power designs; identical here so no penalty either way. |
| Output Noise (0.1–10 Hz) | 3.4 µV p-p typ | 1.75 µV p-p typ | Low-frequency noise limits resolution in high-precision DC measurements; lower noise is preferable for sensitive ADC references. |
| Long-Term Drift | 50 ppm/1000 h typ | 50 ppm/1000 h typ | Long-term stability affects recalibration intervals in instrumentation; both parts share similar drift behavior. |
| Package | 8-Lead SOIC | 8-Lead SOIC | Package and pinout compatibility determine whether a part can be dropped into an existing PCB footprint; both use the same SOIC-8 outline. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | ADR425BRZ | ADR420AR-REEL7 |
|---|---|---|
| Series | XFET® | XFET® |
| Part Status | Active | Obsolete |
| Mounting Type | Surface Mount | Surface Mount |
| Reference Type | Series | - |
| Output Type | Fixed | - |
| Voltage - Output (Min/Fixed) | 5V | - |
| Current - Output | 10 mA | - |
| Tolerance | ±0.04% | - |
| Temperature Coefficient | 3ppm/°C | - |
| Noise - 01 Hzto10 Hz | 3.4µVp-p | - |
| Voltage - Input | 7V ~ 18V | - |
| Supply Current | 600µA | - |
| Operating Temperature | -40°C ~ 125°C (TA) | - |
Frequently asked questions
What are the key differences between the ADR425BRZ and ADR420AR-REEL7 voltage references?
The ADR425BRZ is a 5.000 V precision voltage reference in an 8-lead SOIC package with a B-grade initial accuracy of ±0.04% and a temperature coefficient of 3 ppm/°C max. The ADR420AR-REEL7 is a 2.048 V precision voltage reference in an 8-lead SOIC package with an A-grade initial accuracy of ±0.1% and a temperature coefficient of 10 ppm/°C max. The primary differences are output voltage (5.000 V vs 2.048 V), accuracy grade, and temperature coefficient.
Are the ADR425BRZ and ADR420AR-REEL7 pin-compatible?
Both devices are offered in the same 8-lead SOIC (R-8) package and share the same pinout: pin 1 and 8 are VIN, pin 2 is VOUT, pin 3 is GND, pin 4 is TRIM, pin 5 is NC, pin 6 is VOUT SENSE, and pin 7 is NC. However, because the output voltages differ (5.000 V vs 2.048 V), they are not electrically interchangeable in a given design despite package and pinout compatibility.
Can the ADR420AR-REEL7 be used as a direct replacement for the ADR425BRZ?
No. The ADR425BRZ provides a 5.000 V output while the ADR420AR-REEL7 provides a 2.048 V output, so a direct substitution would change the reference voltage by more than 2.9 V. Additionally, the ADR420AR-REEL7 has a wider temperature coefficient (10 ppm/°C max vs 3 ppm/°C max) and looser initial accuracy (±0.1% vs ±0.04%). A replacement requires revalidation of the circuit's reference voltage, accuracy budget, and thermal drift performance.
What are the initial accuracy specifications of each device?
The ADR425BRZ (B grade) has an initial accuracy of ±0.04% maximum, corresponding to ±2 mV at 5.000 V. The ADR420AR-REEL7 (A grade) has an initial accuracy of ±0.1% maximum, corresponding to approximately ±2 mV at 2.048 V. Both specifications are stated at 25°C per the respective manufacturer datasheets.
How do the temperature coefficients of the ADR425BRZ and ADR420AR-REEL7 compare?
The ADR425BRZ is specified with a maximum temperature coefficient of 3 ppm/°C over the −40°C to +125°C temperature range. The ADR420AR-REEL7 is specified with a maximum temperature coefficient of 10 ppm/°C over the same temperature range. The ADR425BRZ therefore offers tighter thermal stability, which is significant in precision measurement and data acquisition applications.
What are the output voltage and operating supply requirements for each part?
The ADR425BRZ provides a fixed 5.000 V output and requires a supply voltage of at least 7 V (VOUT + 2 V dropout) per the datasheet. The ADR420AR-REEL7 provides a fixed 2.048 V output and requires a supply voltage of at least 4.048 V (VOUT + 2 V dropout). Both devices are specified for operation over the −40°C to +125°C temperature range.
What is the difference in package and packaging between the two orderable part numbers?
Both the ADR425BRZ and ADR420AR-REEL7 are supplied in the 8-lead SOIC (R-8) package. The ADR425BRZ suffix indicates tube packaging, while the ADR420AR-REEL7 suffix indicates tape-and-reel packaging in 7-inch reels. The package body and pinout are identical; only the delivery format differs.
Which device is better suited for low-voltage precision systems?
The ADR420AR-REEL7, with its 2.048 V output, is better suited to low-voltage systems such as 3.3 V or 5 V single-supply ADCs and DACs where a 2.048 V reference maximizes dynamic range without exceeding the supply rail. The ADR425BRZ's 5.000 V output is preferable in systems with higher supply rails or where a 5 V full-scale reference is required. Selection should be based on the ADC/DAC input range and available supply headroom.