LM323-N

ACTIVE

3A 5V Fixed Output Linear Regulator

Product details

Output options Fixed Output Iout (max) (A) 3 Vin (max) (V) 20 Vin (min) (V) 7.5 Vout (max) (V) 5 Vout (min) (V) 5 Fixed output options (V) 5 Noise (µVrms) 40 Iq (typ) (mA) 12 Thermal resistance θJA (°C/W) 35 Rating Military Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 2 PSRR at 100 KHz (dB) 55 Dropout voltage (Vdo) (typ) (mV) 1900 Operating temperature range (°C) 0 to 125
Output options Fixed Output Iout (max) (A) 3 Vin (max) (V) 20 Vin (min) (V) 7.5 Vout (max) (V) 5 Vout (min) (V) 5 Fixed output options (V) 5 Noise (µVrms) 40 Iq (typ) (mA) 12 Thermal resistance θJA (°C/W) 35 Rating Military Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 2 PSRR at 100 KHz (dB) 55 Dropout voltage (Vdo) (typ) (mV) 1900 Operating temperature range (°C) 0 to 125
TO-CAN (NDS) 2 969.2166 mm² 38.94 x 24.89
  • Guaranteed 1% initial accuracy (A version)
  • 3 amp output current
  • Internal current and thermal limiting
  • 0.01 Ohm typical output impedance
  • 7.5V minimum input voltage
  • 30W power dissipation
  • P+ Product Enhancement tested

  • Guaranteed 1% initial accuracy (A version)
  • 3 amp output current
  • Internal current and thermal limiting
  • 0.01 Ohm typical output impedance
  • 7.5V minimum input voltage
  • 30W power dissipation
  • P+ Product Enhancement tested

The LM123 is a three-terminal positive regulator with a preset 5V output and a load driving capability of 3 amps. New circuit design and processing techniques are used to provide the high output current without sacrificing the regulation characteristics of lower current devices.

The LM323A offers improved precision over the standard LM323. Parameters with tightened specifications include output voltage tolerance, line regulation, and load regulation.

The 3 amp regulator is virtually blowout proof. Current limiting, power limiting, and thermal shutdown provide the same high level of reliability obtained with these techniques in the LM109 1 amp regulator.

No external components are required for operation of the LM123. If the device is more than 4 inches from the filter capacitor, however, a 1 µF solid tantalum capacitor should be used on the input. A 0.1 µF or larger capacitor may be used on the output to reduce load transient spikes created by fast switching digital logic, or to swamp out stray load capacitance.

An overall worst case specification for the combined effects of input voltage, load currents, ambient temperature, and power dissipation ensure that the LM123 will perform satisfactorily as a system element.

For applications requiring other voltages, see LM150 series adjustable regulator data sheet.

Operation is guaranteed over the junction temperature range -55°C to +150°C for LM123, -40°C to +125°C for LM323A, and 0°C to +125°C for LM323. A hermetic TO-3 package is used for high reliability and low thermal resistance.


The LM123 is a three-terminal positive regulator with a preset 5V output and a load driving capability of 3 amps. New circuit design and processing techniques are used to provide the high output current without sacrificing the regulation characteristics of lower current devices.

The LM323A offers improved precision over the standard LM323. Parameters with tightened specifications include output voltage tolerance, line regulation, and load regulation.

The 3 amp regulator is virtually blowout proof. Current limiting, power limiting, and thermal shutdown provide the same high level of reliability obtained with these techniques in the LM109 1 amp regulator.

No external components are required for operation of the LM123. If the device is more than 4 inches from the filter capacitor, however, a 1 µF solid tantalum capacitor should be used on the input. A 0.1 µF or larger capacitor may be used on the output to reduce load transient spikes created by fast switching digital logic, or to swamp out stray load capacitance.

An overall worst case specification for the combined effects of input voltage, load currents, ambient temperature, and power dissipation ensure that the LM123 will perform satisfactorily as a system element.

For applications requiring other voltages, see LM150 series adjustable regulator data sheet.

Operation is guaranteed over the junction temperature range -55°C to +150°C for LM123, -40°C to +125°C for LM323A, and 0°C to +125°C for LM323. A hermetic TO-3 package is used for high reliability and low thermal resistance.


Download View video with transcript Video

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 2
Type Title Date
* Data sheet LM123/LM323A/LM323 3-Amp, 5-Volt Positive Regulator datasheet (Rev. B) 17 Nov 2004
More literature Die D/S LM323 MWC 3-Amp, 5-Volt Positive Regulator 21 Sep 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Package Pins CAD symbols, footprints & 3D models
TO-CAN (NDS) 2 Ultra Librarian

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos