SPX431L

Precision Adjustable Shunt Regulator

Description

The SPX431L is a 3-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference. The SPX431L acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431L’s thermal stability, wide operating current (100mA) and temperature range (0°C to 105°C) makes it suitable for a variety of applications that require a low cost, high performance solution. SPX431L tolerance of 0.5% is proven to be sufficient to overcome all of the other errors in the system to virtually eliminate the need for trimming in the power supply manufacturer's assembly line and contribute a significant cost savings.

The output voltage may be adjusted to any value between VREF and 20V with two external resistors. The SPX431L is available in TO-92, and SOT-89 packages.

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Features

  • Tight voltage tolerance 0.5% at 10mA
  • Wide operating current 1mA to 100mA
  • Extended temperature range: 0°C to 105°C
  • Low temperature coefficient 30 ppm/°C
  • Improved replacement in performance for TL431 and AS431
  • Low cost solution

Documentation

Application

  • Battery operating equipment
  • Adjustable supplies
  • Switching power supplies
  • Error amplifiers
  • Single supply amplifier
  • Monitors / VCRs / TVs
  • Personal computers

Design Tools

Symbols & Footprints

Packaging

Pkg Code Details Quantities Dimensions PDF
NSOIC8
  • 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
SOT-23-3
  • 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
SOT-23-5
  • JEDEC Reference: MO-178
  • MSL Pb-Free: L1 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 191ºC/W
  • 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 12
  • Tape & Reel Unit Orientation: 3 Pins at sprocket hole.
  • Dimensions: mm
  • Length: 2.90
  • Width: 1.60
  • Thickness: 1.45
  • Lead Pitch: 0.95
SOT-89-3
  • JEDEC Reference: TO-243
  • MSL Pb-Free: L2 @ 260ºC
  • MSL SnPb Eutectic: n/a
  • ThetaJA: 107.1ºC/W
  • Bulk Pack Style: Canister
  • Quantity per Bulk Pack: n/a
  • Quantity per Reel: 2500
  • Quantity per Tube: n/a
  • Quantity per Tray: n/a
  • Reel Size (Dia. x Width x Pitch): 330 x 12 x 8
  • Tape & Reel Unit Orientation: Tab at sprocket hole.
  • Dimensions: mm
  • Length: 4.60 max
  • Width: 2.60 max
  • Thickness: 1.60
  • Lead Pitch: 1.50
TO-92-3
  • 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

Parts & Purchasing

Part Number Pkg Code RoHS Min Temp Max Temp Status Buy Now Order Samples
SPX431LAM SOT-23-3 OBS
SPX431LAM/TR SOT-23-3 0 105 OBS
SPX431LAM1 SOT-89-3 OBS
SPX431LAM1/TR SOT-89-3 OBS
SPX431LAM1-L SOT-89-3 0 105 OBS Suggested:
SPX431LM1-L
SPX431LAM1-L/TR SOT-89-3 0 105 OBS Suggested:
SPX431LM1-L/TR
SPX431LAM-L SOT-23-3 0 105 OBS
SPX431LAM-L/TR SOT-23-3 0 105 OBS
SPX431LAN TO-92 OBS
SPX431LAN/TR TO-92-3 0 105 OBS
SPX431LAN-L TO-92-3 0 105 OBS Suggested:
SPX431LAN-L/TR
SPX431LAN-L/TR TO-92-3 0 105 OBS
SPX431LAS NSOIC8 OBS
SPX431LAS/TR NSOIC8 OBS
SPX431LAS-L SOIC8 0 105 OBS
SPX431LAS-L/TR NSOIC8 OBS
SPX431LBM5-L SOT-23-5 0 105 OBS
SPX431LBM5-L/TR SOT-23-5 0 105 OBS
SPX431LCM SOT-23-3 OBS
SPX431LCM/TR SOT-23-3 OBS
SPX431LCM1 SOT-89-3 OBS
SPX431LCM1/TR SOT-89-3 OBS
SPX431LCM1-L SOT-89-3 OBS
SPX431LCM1-L/TR SOT-89-3 OBS
SPX431LCM-L SOT-23-3 OBS
SPX431LCM-L/TR SOT-23-3 OBS
SPX431LCN TO-92-3 0 105 OBS
SPX431LCN/TR TO-92-3 0 105 OBS
SPX431LCN-L TO-92-3 0 105 OBS
SPX431LCN-L/TR TO-92-3 0 105 OBS
SPX431LCS NSOIC8 OBS
SPX431LCS/TR NSOIC8 OBS
SPX431LCS-L SOIC8 0 105 OBS
SPX431LCS-L/TR NSOIC8 OBS
SPX431LJAM1-L SOT-89-3 0 105 OBS
SPX431LJAN-L TO-92-3 0 105 OBS
SPX431LJCN-L TO-92-3 0 105 OBS
SPX431LM SOT-23-3 0 105 OBS
SPX431LM/TR SOT-23-3 OBS
SPX431LM1 SOT-89-3 OBS
SPX431LM1/TR SOT-89-3 0 105 OBS
SPX431LM1-L SOT-89-3 0 105 OBS Suggested:
SPX431LM1-L/TR
SPX431LM1-L/TR SOT-89-3 0 105 Active
SPX431LM-L SOT-23-3 0 105 OBS
SPX431LM-L/TR SOT-23-3 OBS
SPX431LN TO-92 OBS
SPX431LN/TR TO-92 OBS
SPX431LN-L TO-92-3 0 105 OBS Suggested:
SPX431LN-L/TR
SPX431LN-L/TR TO-92-3 0 105 OBS Suggested:
SPX431AM1-L/TR
SPX431LS NSOIC8 OBS
SPX431LS/TR NSOIC8 OBS
SPX431LS-L SOIC8 0 105 OBS
SPX431LS-L/TR NSOIC8 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.

Quality Documents

Part NumberRoHS
SPX431LAN-LDownload
SPX431LM1-LDownload
SPX431LN-LDownload
Additional Quality Documentation may be available, please contact customersupport@exar.com.
Distribution Date Description File
07/11/2017 Product Discontinuation Notification PDN_17-0623-01-1033.pdf
01/12/2017 Standard tape and reel quantity will change from 2500 pieces to 3000 pieces for SOT23-3L/5L/6L. PCN 16-1146-02 Reel size change-1033.pdf
07/26/2016 Product discontinuation notification. Discontinued. PDN 16-0626-01-1033.pdf
04/01/2016 Qualification of alternate assembly subcon, JCET. PCN 15-0727-02 JCET-1033.pdf
03/13/2014 Qualification of an alternate SOT89 package assembly site, Greatek, Taiwan, in addition to the current qualified assembly site, Cirtek, Philippines. Alternate assembly site. PCN_13-1040-01-1033.pdf
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. PCN_13-1040-02-1033.pdf
07/15/2013 Package marking change. To add manufacturing date code and lot traceability. PCN_13-0728-03a-1033.pdf
03/04/2009 Notice of Obsolescence Discontinued by Exar Corporation due to low market demand PDN_090304-01-1033.pdf
02/28/2007 Product Obsolescence Letter and Discontinuation Notification. Discontinued. POL_022807-1033.pdf
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 PCN-06-0130-42-1033.pdf
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 PCN-04-1222-01-1033.pdf

Frequently Asked Questions

The best way to determine this is to go to exar.com and type the part into the search function. At or near the top of the results you should see something that looks like
 
 

In this example, we looked for XRA1201. When you hover over it, it will turn grey and you can click anywhere in the grey box. This brings you to the product page. For example:

 
 

Click on Parts & Purchasing, highlighted in yellow 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:

 
 

Another method to find out if a part is OBS or EOL is to click on SUPPORT:

 

And then Product Change Notifications

 
 

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.

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