1 Features
• Low temperature drift (maximum):
– Enhanced-grade (New): 2.5ppm/°C
– High-grade: 3ppm/°C
– Standard-grade: 8ppm/°C
• High accuracy (maximum):
– Enhanced-grade: 0.025%
– High-grade: 0.05%
– Standard-grade: 0.1%
• Low noise:
– Enhanced-grade: 0.5μVPP/V
– High/Standard-grade: 3μVPP/V
• Excellent long-term stability:
– 22ppm after first 1000 hours (SOIC-8)
– 50ppm after first 1000 hours (VSSOP-8)
• Wide input voltage support:
– Enhanced-grade: 42V
– High/Standard-grade: 18V
• High-output current: ±10mA
• Temperature range: -40°C to 125°C

2 Applications
• Precision data acquisition systems
• Semiconductor test equipment
• Industrial process controls
• Medical instrumentation
• Pressure and temperature transmitters
• Lab and field instrumentation

3 Description
The REF50xx is a family of low-noise, low-drift, very
high precision voltage references. These references
are capable of both sinking and sourcing current, and
have excellent line and load regulation.
Excellent temperature drift (2.5ppm/°C) and high
accuracy (0.025%) are achieved using proprietary
design techniques. These features, combined with
very low flicker noise (0.5μVPP/V), make the REF50xx
family an excellent choice for use in high-precision
data acquisition systems. REF50 family is available in
enhanced grade (REF50xxEI), high grade (REF50xxI)
and standard grade (REF50xxAI). The reference
voltages are offered in 8-pin SOIC and VSSOP
packages and are specified from –40°C to 125°C.
The REF50xxEI supports wide supply voltage rating
of 42V with ultra-low IQ of 340μA. The wide supply
range allows for direct connection to the battery or
field supply. This also protects the device in case of
power supply IC failure.