SPX432

Precision Adjustable Shunt Regulator

Description

The SPX431A is a three-terminal adjustable shunt voltage regulator providing a highly accurate bandgap reference.

The SPX431A acts as an open-loop error amplifier with a 2.5V temperature compensation reference. The SPX431A has thermal stability, wide operating current of 150mA and broad temperature range of -40°C to 125°C, making it suitable for a variety of applications which require a low-cost, high performance solution. The SPX431A tolerance of 0.5% is proven to be sufficient to overcome all 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 36 volts with two external resistors.

The SPX431A is available in RoHS compliant, lead free TO-92 and SOT-23 packages.

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Features

  • 0.5% precise output voltage
    • Adjustable up to 18V
  • Wide operating current
    • 1mA to 80mA
  • Low temperature coefficient at 50ppm/°C
  • Extended temperature range
    • -0°C to 105°C
  • Improved replacement for TLV431
  • RoHS compliant, lead free TO-92 and SOT-23 packages

Documentation

Application

  • Charger
  • Switching power supplies 
  • Graphics card
  • Monitors, VCR, TV

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
SPX432AM SOT-23-3 0 105 OBS
SPX432AM/TR SOT-23-3 0 105 OBS
SPX432AM1 SOT-89-3 OBS
SPX432AM1/TR SOT-89-3 OBS
SPX432AM1-L SOT-89-3 OBS
SPX432AM5 SOT-23-5 OBS
SPX432AM5/TR SOT-23-5 OBS
SPX432AM5-L SOT-23-5 OBS
SPX432AM-L SOT-23-3 0 105 OBS Suggested:
SPX432AM-L/TR
SPX432AM-L/TR SOT-23-3 0 105 OBS Suggested:
SPX432M-L/TR
SPX432AN TO-92 OBS
SPX432AN/TR TO-92-3 0 105 OBS
SPX432AN-L TO-92-3 0 105 OBS Suggested:
SPX432N-L
SPX432AN-L/TR TO-92-3 0 105 OBS Suggested:
SPX432N-L/TR
SPX432AS NSOIC8 OBS
SPX432AS/TR NSOIC8 OBS
SPX432AS-L NSOIC8 OBS
SPX432AS-L/TR NSOIC8 OBS
SPX432M SOT-23-3 0 105 OBS
SPX432M/TR SOT-23-3 0 105 OBS
SPX432M1 SOT-89-3 OBS
SPX432M1/TR SOT-89-3 OBS
SPX432M1-L SOT-89-3 OBS
SPX432M5 SOT-23-5 OBS
SPX432M5/TR SOT-23-5 OBS
SPX432M5-L SOT-23-5 OBS
SPX432M-L SOT-23-3 0 105 OBS Suggested:
SPX432M-L/TR
SPX432M-L/TR SOT-23-3 0 105 Active
SPX432N TO-92-3 0 105 OBS
SPX432N/TR TO-92 OBS
SPX432N-L TO-92-3 0 105 OBS Suggested:
SPX432M-L/TR
SPX432N-L/TR TO-92-3 0 105 OBS Suggested:
SPX432M-L/TR
SPX432S NSOIC8 OBS
SPX432S/TR NSOIC8 OBS
SPX432S-L NSOIC8 0 105 OBS
SPX432S-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.
Distribution Date Description File
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. PCN16-1146-02A Addendum-1033.pdf
07/11/2017 Product Discontinuation Notification PDN_17-0623-01-1033.pdf
04/12/2017 Qualification of alternate assembly subcon, JCET. PCN 17-0207-01 JCET-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
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
07/30/2013 Addition of an alternate qualified assembly supplier, Carsem (Malaysia) for SOT23 package using copper wire bonding. Material Change. PCN_13-0521-03a-1033.pdf
12/14/2009 Material Change. Use environmental friendly Green (halogen free) material and also for standardization. PCN_09-1109-01-1033.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 facility to wafer foundary BCD. 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-06-0130-44-1033.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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