LT1021 - Precision Reference


  • Ultralow Drift: 5ppm/°C Max Slope
  • Very Low Noise: P-P (0.1Hz to 10Hz)
  • 100% Noise Tested
  • Pin Compatible with Most Bandgap Reference Applications, Including REF01, REF02, LM368, MC1400 and MC1404 with Greatly Improved Stability, Noise and Drift
  • Trimmed Output Voltage
  • Operates in Series or Shunt Mode
  • Output Sinks and Sources in Series Mode
  • >100dB Ripple Rejection
  • Minimum Input/Output Differential of 1V
  • Available in 5-Lead Can, N8 and S8 Packages

Typical Application

LT1021 Typical Application
LT1021 Typical Application


The LT1021 is a precision reference with ultralow drift and noise, extremely good long term stability and almost total immunity to input voltage variations. The reference output will both source and sink up to 10mA. Three voltages are available: 5V, 7V and 10V. The 7V and 10V units can be used as shunt regulators (two-terminal zeners) with the same precision characteristics as the three terminal connection. Special care has been taken to minimize thermal regulation effects and temperature induced hysteresis.

The LT1021 references are based on a buried zener diode structure that eliminates noise and stability problems associated with surface breakdown devices. Further, a subsurface zener exhibits better temperature drift and time stability than even the best bandgap references.

Unique circuit design makes the LT1021 the first IC reference to offer ultralow drift without the use of high power on-chip heaters.

The LT1021-7 uses no resistive divider to set output voltage, and therefore exhibits the best long term stability and temperature hysteresis. The LT1021-5 and LT1021- 10 are intended for systems requiring a precise 5V or 10V reference with an initial tolerance as low as ±0.05%.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LT1021BCH-5 TO-5 H C 05-08-1320 No
LT1021BCN8-10#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021BCN8-5#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021BCN8-7#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021BMH-10 TO-5 H M 05-08-1320 No
LT1021BMH-5 TO-5 H M 05-08-1320 No
LT1021CCH-5 TO-5 H C 05-08-1320 No
LT1021CCN8-10#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021CCN8-5#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021CIN8-10#PBF N-8 N I 05-08-1510 (N8) Yes
LT1021CIN8-5#PBF N-8 N I 05-08-1510 (N8) Yes
LT1021CMH-5 TO-5 H M 05-08-1320 No
LT1021DCN8-10#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021DCN8-5#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021DCN8-7#PBF N-8 N C 05-08-1510 (N8) Yes
LT1021DCS8-10#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1021DCS8-10#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1021DCS8-5#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1021DCS8-5#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1021DCS8-7#PBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1021DCS8-7#TRPBF SO-8 S8 C 05-08-1610 (S8) Yes
LT1021DIN8-10#PBF N-8 N I 05-08-1510 (N8) Yes
LT1021DIN8-5#PBF N-8 N I 05-08-1510 (N8) Yes

LT1021 Package Drawing
LT1021 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LT1021BCH-5 TO-5 C $8.40 $6.90 No
LT1021BCN8-10#PBF N-8 C $6.42 $5.25 Yes
LT1021BCN8-5#PBF N-8 C $6.42 $5.25 Yes
LT1021BCN8-7#PBF N-8 C $6.42 $5.25 Yes
LT1021BMH-10 TO-5 M $18.25 $15.00 No
LT1021BMH-5 TO-5 M $18.25 $15.00 No
LT1021CCH-5 TO-5 C $6.25 $5.15 No
LT1021CCN8-10#PBF N-8 C $4.25 $3.50 Yes
LT1021CCN8-5#PBF N-8 C $4.25 $3.50 Yes
LT1021CIN8-10#PBF N-8 I $5.75 $4.65 Yes
LT1021CIN8-5#PBF N-8 I $5.75 $4.65 Yes
LT1021CMH-5 TO-5 M $10.00 $8.20 No
LT1021DCN8-10#PBF N-8 C $3.17 $2.65 Yes
LT1021DCN8-5#PBF N-8 C $3.17 $2.65 Yes
LT1021DCN8-7#PBF N-8 C $2.08 $1.75 Yes
LT1021DCS8-10#PBF SO-8 C $3.92 $3.20 Yes
LT1021DCS8-10#TRPBF SO-8 C $3.26 Yes
LT1021DCS8-5#PBF SO-8 C $3.92 $3.20 Yes
LT1021DCS8-5#TRPBF SO-8 C $3.26 Yes
LT1021DCS8-7#PBF SO-8 C $3.92 $3.20 Yes
LT1021DCS8-7#TRPBF SO-8 C $3.26 Yes
LT1021DIN8-10#PBF N-8 I $4.25 $3.50 Yes
LT1021DIN8-5#PBF N-8 I $4.25 $3.50 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

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Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards


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