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REF81
  • REF81

REF81

PREVIEW

Temperature-controlled buried-Zener reference with 0.05ppm/°C drift and <1ppm stability

Texas Instruments REF81 Product Info

1 April 2026 4

Parameters

Rating

Catalog

VO (V)

2.5, 4.096, 5, 8.192, 10

Temp coeff (max) (ppm/°C)

0.2

Features

Buried Zener diode, Integrated heater

Vin (min) (V)

10

Vin (max) (V)

16.5

Iq (typ) (mA)

17

LFN 0.1 to 10 Hz (typ) (µVPP)

0.825

Operating temperature range (°C)

0 to 70

Package

LCCC (NAJ)-20-79.0321 mm² 8.89 x 8.89

Features

  • Buried zener core 7.6V output
  • Industry standard fixed output voltage
    • 1X gain: 2.5V, 4.096V, 5V
    • 2X gain: 5V, 8.192V, 10V
  • No external buffer for 1X and 2X gain output
  • Industry standard fixed output initial accuracy
    • 1X gain: ±0.05%
    • 2X gain: ±0.1%
  • Ultra-low temperature drift: 0.05ppm/°C
  • Operating temperature range: 0°C to 70°C
  • Excellent long term stability: 0.3ppm (1khr to 5khr)
  • 1/f noise (0.1Hz to 10Hz) : 0.15ppmpk-pk
  • Integrated heater with temperature stable indicator
  • Input Voltage range: 10V to 16.5V
  • Heater supply range: 10V to 42V
  • Hermetically sealed ceramic package (20 pin LCCC)
  • Buried zener core 7.6V output
  • Industry standard fixed output voltage
    • 1X gain: 2.5V, 4.096V, 5V
    • 2X gain: 5V, 8.192V, 10V
  • No external buffer for 1X and 2X gain output
  • Industry standard fixed output initial accuracy
    • 1X gain: ±0.05%
    • 2X gain: ±0.1%
  • Ultra-low temperature drift: 0.05ppm/°C
  • Operating temperature range: 0°C to 70°C
  • Excellent long term stability: 0.3ppm (1khr to 5khr)
  • 1/f noise (0.1Hz to 10Hz) : 0.15ppmpk-pk
  • Integrated heater with temperature stable indicator
  • Input Voltage range: 10V to 16.5V
  • Heater supply range: 10V to 42V
  • Hermetically sealed ceramic package (20 pin LCCC)

Description

The REF81 device utilizes precision buried zener core with integrated heater to generate stable 7.6V. The device further integrates precision resistor dividers and a buffer to offer industry standard voltage references to drive precision data converters. Integrated temperature control with an internal heater enables the reference voltage stay constant irrespective of ambient temperature variations and achieve extremely low temperature drift of 0.05ppm/°C. The integration of control loop, precision resistances and buffer enables ease of design and eliminates need of external precision components.

The REF81 family is available in a 20-pin LCCC package. The LCCC package is a hermetically sealed ceramic package that enables ultra low long-term stability specification of 1ppm, critical for applications that demand a longer operational window without calibration. The package also offers excellent immunity against humidity variation.

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