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500-mA, 40-V, adjustable linear voltage regulator

Inventory: 85,513
Custom reel may be available

Download data sheet for LM317M
  |   View additional information for LM317M

Same as: LM317MDCYRG3   This part number is identical to the part number listed above. You can only order quantities of the part number listed above.

Packaging information

Package | Pins SOT-223 (DCY) | 4
Operating temperature range (°C) Q (-40 to 125)
Package qty | Carrier: 2,500 | LARGE T&R
Custom reel may be available
View more packaging information

Quality information

RoHS Yes
Lead finish / Ball material SN
MSL rating / Peak reflow Level-2-260C-1 YEAR
Material content View
DPPM / MTBF / Fit rate View
Qualification summary View
Ongoing reliability monitoring View
Device marking View


  • Output Voltage Range Adjustable
    from 1.25-V to 37-V
  • Output Current Greater Than 500-mA
  • Internal Short-Circuit Current Limiting
  • Thermal-Overload Protection
  • Output Safe-Area Compensation
  • Q Devices Meet Automotive Performance Requirements
  • Customer-Specific Configuration Control Can Be Supported for Q Devices Along With
    Major-Change Approval


The LM317M is an adjustable 3-terminal positive voltage regulator capable of supplying more than 500-mA over an output-voltage range of 1.25-V to
37-V. The LM317M is exceptionally easy to use and requires only two external resistors to set the output. Furthermore, both line and load regulation are better than standard fixed regulators.

In addition to having higher performance than fixed regulators, the LM317M includes on-chip current limiting, thermal-overload protection, and safe- operating-area protection. All overload protection remains fully functional if the ADJUST terminal is disconnected.

The LM317 is a floating regulator meaning there is no device ground terminal. Quiescent current flows to the load instead of being wasted flowing to ground. Regulated output voltage of hundreds of volts is possible if the maximum input to output differential does not exceed 40-V at any time. Device can be used as a floating current source controlled by a single resistor.

Normally, no capacitors are needed unless the device is more than six inches from the input filter capacitors, in which case an input bypass capacitor of any type is needed. An optional electrolytic or tantalum output capacitor can be added to improve transient response. Ceramic output capacitors can be used but output ringing may be present on transients. The ADJUST terminal can be bypassed with any type of capacitor to achieve high ripple-rejection ratios, which are difficult to achieve with standard three-terminal regulators.

Qty Price
1-99 $0.445
100-249 $0.342
250-999 $0.252
1,000+ $0.180

Alternative carriers

Part number LM317MDCY
Package qty | Carrier 80 | TUBE
Inventory 8,435
Qty | Price (USD) 1ku | $0.216