The ADR421BRZ-REEL7 from Analog Devices is an ultraprecision 2.5V voltage reference based on second-generation XFET® technology. The ADR42x family is designed to provide low noise, high accuracy and excellent long-term stability for precision data acquisition, high-resolution converters, instrumentation and industrial control systems.
As a B-grade ADR421, the device provides ±0.04% initial room-temperature accuracy. Its temperature coefficient is approximately 1ppm/°C typical and 3ppm/°C maximum, supporting precision operation across the extended -40°C to +125°C temperature range.
The ADR421 provides excellent low-frequency noise performance of only 1.75µV p-p from 0.1Hz to 10Hz. Long-term stability is specified at 50ppm per 1000 hours, while typical thermal hysteresis is approximately 40ppm, helping maintain reference accuracy in long-duration precision applications.
The device operates from an input voltage range of 4.5V to 18V, with a maximum quiescent current of only 0.5mA and output-current capability up to 10mA. Load regulation is approximately 70ppm/mA, while line regulation is 35ppm/V.
An integrated trim function allows the nominal output voltage to be adjusted over approximately ±0.5% without significantly affecting other performance characteristics, providing additional flexibility for system-level calibration.
The exact ADR421BRZ-REEL7 ordering option is supplied in an 8-lead SOIC package. ADI’s Sample & Buy information specifies 1000 devices per reel, and the exact model is currently listed as PRODUCTION.
Key Specifications:
- Brand: Analog Devices / ADI
- Part Number: ADR421BRZ-REEL7
- Family: ADR42x
- Product Type: Precision Voltage Reference
- Reference Technology: XFET®
- Output Type: Fixed
- Nominal Output Voltage: 2.5V
- Grade: B
- Initial Accuracy: ±0.04%
- Typical Temperature Coefficient: 1ppm/°C
- Maximum Temperature Coefficient: 3ppm/°C
- Input Voltage Range: 4.5V to 18V
- Output Current: Up to 10mA
- Maximum Quiescent Current: 0.5mA
- Low-Frequency Noise: 1.75µV p-p, 0.1Hz to 10Hz
- Long-Term Stability: 50ppm / 1000h
- Thermal Hysteresis: 40ppm Typ
- Load Regulation: 70ppm/mA
- Line Regulation: 35ppm/V
- Output Trim Range: Approx. ±0.5%
- Operating Temperature: -40°C to +125°C
- Package: SOIC-8
- Pin Count: 8
- Mounting Type: SMD / SMT
- Packaging: REEL7 / Tape & Reel
- Reel Quantity: 1000 pcs
- Product Status: PRODUCTION.
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