Micropower Highly Stable Voltage Reference


Information Micropower Highly Stable Voltage Reference
Package SOT23-3
Temperature Range (°C) -40 to 85
Reference Voltage Fixed
VOUT (V) 5.0
VOUT Adj MIN (V) -
VOUT Adj MAX (V) -
Operating Current (MAX) (mA) 20
Operating Current (MIN) (mA) 0.01
IQ (µA) 10
Initial Accuracy (%) 1, 2
IREF (µA) -
Temperature Coefficient (ppm/°C) 80
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The SPX385 series is a micropower 2-terminal band-gap highly stable voltage reference with a wide 10µA to 20mA operating current range.  The SPX385 series is available in a SOT23-3, TO92-3 and NSOIC-8 packages.

  • Output voltage option: 1.235V, 2.5V and 5.0V
  • Initial tolerance: 1% and 2%
  • Low temperature coefficient as low as 30ppm/°C (typ)
  • Dynamic impedance: 1Ωmax
  • Operating current: 10µA to 20mA
  • Extended temperature range: -40°C to 85°C
  • Pin compatible with LM185/285/385

  • Adjustable power supplies
  • Error amplifiers
  • Power meters
  • Medical and industrial instrumentation

Documentation & Design Tools

Type Title Version Date File Size
Data Sheets SPX385-2.5 Micropower Voltage Reference 1.0.0 February 2008 167.4 KB
Data Sheets SPX385-5.0 5V Micropower Voltage Reference 1.0.0 January 2007 137.4 KB
Application Notes AN200, Downloading and Installing CAD Symbols and Footprints with Ultra Librarian April 2019 1.2 MB
Product Brochures Power Management Brochure October 2020 2.4 MB
Symbols & Footprints SPX385AM-L-2-5/TR CAD File (.bxl) September 2018 65.9 KB
Symbols & Footprints SPX385AM-L-5-0/TR CAD File (.bxl) September 2018 65.9 KB
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Quality & RoHS

Part Number RoHS | Exempt RoHS Halogen Free REACH TSCA MSL Rating / Peak Reflow Package
SPX385AM-L-5-0/TR N Y Y Y Y L2 / 260ᵒC SOT-89-3
SPX385AM-L-2-5/TR N Y Y Y Y L2 / 260ᵒC SOT-89-3

Click on the links above to download the Certificate of Non-Use of Hazardous Substances.

Additional Quality Documentation may be available, please Contact Support.

Parts & Purchasing

Part Number Pkg Code Min Temp Max Temp Status Suggested Replacement Buy Now Order Samples PDN
SPX385AM-L-2-5/TR SOT-23-3 -40 85 Active Order
SPX385AM-L-5-0/TR SOT-23-3 -40 85 OBS SPX385AM-L-2-5/TR
SPX385AS-L-1-2/TR NSOIC8 -40 85 OBS
SPX385N-L-2-5 TO-92-3 -40 85 OBS
SPX385N-L-2-5/TR TO-92-3 -40 85 OBS
Show obsolete parts
Part Status Legend
Active - the part is released for sale, standard product.
EOL (End of Life) - the part is no longer being manufactured, there may or may not be inventory still in stock.
CF (Contact Factory) - the part is still active but customers should check with the factory for availability. Longer lead-times may apply.
PRE (Pre-introduction) - the part has not been introduced or the part number is an early version available for sample only.
OBS (Obsolete) - the part is no longer being manufactured and may not be ordered.
NRND (Not Recommended for New Designs) - the part is not recommended for new designs.


Pkg Code Details Quantities Dimensions PDF
  • JEDEC Reference: MS-012
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 128.4ºC/W (std); 96.8ºC/W (fused)
  • Bulk Pack Style: Tube
  • Quantity per Bulk Pack: 98
  • Quantity per Reel: 2500
  • Quantity per Tube: 98
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Quadrant 1
  • Dimensions: mm
  • Length: 4.90
  • Width: 3.90
  • Thickness: 1.75
  • Lead Pitch: 1.27
  • JEDEC Reference: TO-236
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: n/a
  • Bulk Pack Style: Canister
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 3000
  • Quantity per Tube: n/a
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 180 x 8 x 4
  • Tape & Reel Unit Orientation: Single Pin at sprocket hole.
  • Dimensions: mm
  • Length: 2.90
  • Width: 1.30
  • Thickness: 1.12
  • Lead Pitch: 0.95
  • JEDEC Reference: n/a
  • MSL Pb-Free: n/a
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 131.9ºC/W
  • Bulk Pack Style: Ammo
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 2000
  • Quantity per Tube: n/a
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): Ammo
  • Tape & Reel Unit Orientation: Ammopack
  • Dimensions: inch
  • Length: 0.195 max
  • Width: 0.195 max
  • Thickness: 0.155 max
  • Lead Pitch: 0.055


Distribution Date Description File
11/04/2021 Product Discontinuation Notice
11/04/2021 Product Discontinuation Notice
02/16/2018 Standard tape and reel quantity will change from 2500 pieces to 3000 pieces for SOT23-3L/5L/6L. Addendum: Remove SOT-89 parts from affected products list.
07/11/2017 Product Discontinuation Notification
04/12/2017 Qualification of alternate assembly subcon, JCET.
02/15/2017 Qualification of alternate assembly subcon, ANST.
01/12/2017 Standard tape and reel quantity will change from 2500 pieces to 3000 pieces for SOT23-3L/5L/6L.
07/26/2016 Product discontinuation notification. Discontinued.
04/13/2016 Qualification of alternate assembly subcon, JCET.
01/13/2014 Qualification of an alternate qualified 3L TO-92 production site, Greatek, Taiwan, in addition to the current production site, Carsem, Malaysia. Alternate assembly site.
07/30/2013 Addition of an alternate qualified assembly supplier, Carsem (Malaysia) for SOT23 package using copper wire bonding. Material Change.
12/14/2009 Material Change. Use environmental friendly Green (halogen free) material and also for standardization.
12/07/2009 Enhancement of NSOIC 8, NSOIC14 and NSOIC16 packages to Green (halogen-free) via Mold Compound & Die Attach Material. Enhance packages to be Green (halogen-free).
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand
05/30/2008 Change Temperature Coefficient from MAX 50PPM to MAX 140PPM. Product re-characterization.
04/01/2008 Micropower Voltage Reference Change the temperature limits from MAX 100PPM/C to 140PPM/C.
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued.
02/02/2006 Announcing transfer of certain Power Management and Interface Products from Hillview fabrication and facility to wafer foundary Silan. See attached Product List Power Management and Interface products as listed are being transfer to external wafer foundry, due to cessation of operations of the sipex Hillview Fabrication manufacturing site
12/22/2004 Sipex has qualified CET to perform assembly operation fot the SOT23 -3 L package. Some of the CET SOT23 3 L pkg. dimensions are slightly different than the Jedec To-236 Variation AB std. Improve manufacturability

FAQs & Support

Search our list of FAQs for answers to common technical questions.
For material content, environmental, quality and reliability questions review the Quality tab or visit our Quality page.
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Click on Parts & Purchasing, highlighted with the blue arrow above. The screen changes to:


Notice the status column and the “Show obsolete parts” link.  A legend tells you the definition of the different statuses. Click on the “Show obsolete parts” link to see EOL or OBS part numbers along with the Active part numbers, the legend still present:


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Type the part into the search, and click on one of the part numbers from the drop down menu. Then you can look for the Product Discontinuation Notice, which generally is at the top of the list, for example:


If you see this, it tells you that this particular orderable part has been discontinued and when the last order date is, or was. If you click on the file, then you can view the notice we sent about this if you purchased the part in the recent past. It may also advise of a replacement part. When an orderable part first becomes discontinued, Product Discontinuation Notices are sent are sent to those who have purchased the parts in the recent past, if purchased directly, with a dated opportunity to place a last order.