Features Preset output voltage error less than ±3% Preset current limit Internal thermal shutdown Operates with input-output voltage differential down to 1V Excellent ripple rejection Low temperature drift Easily adjustable to higher output voltage Description The LM120 series are three-terminal negative regulators with a fixed output voltage of −5V, −12V, and −15V, and up to 1.5A load current capability. Where other voltages are required, the LM137 and LM137HV series provide an output voltage range of −1.2V to −47V. The LM120 need only one external component—a compensation capacitor at the output, making them easy to apply. Worst case guarantees on output voltage deviation due to any combination of line, load or temperature variation assure satisfactory system operation. Exceptional effort has been made to make the LM120 Series immune to overload conditions. The regulators have current limiting which is independent of temperature, combined with thermal overload protection. Internal current limiting protects against momentary faults while thermal shutdown prevents junction temperatures from exceeding safe limits during prolonged overloads. Although primarily intended for fixed output voltage applications, the LM120 Series may be programmed for higher output voltages with a simple resistive divider. The low quiescent drain current of the devices allows this technique to be used with good regulation.

Dual Trimmed Supply

Typical Application click for larger image Dual Trimmed Supply	Connection Diagram click for larger image Connection Diagram TO-3 (K)
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM320 Series 3-Terminal Negative Regulators	733 Kbytes	11-Aug-10

Application Notes

Title		Size	Date	Other Language
	AN-103: Application Note 103 LM340 Series Three Terminal Positive Regulators	421 Kbytes	3-Oct-02

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM320T-15/NOPB LM320T-15 RoHS Status	TO-220	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 804 AVNET-EM Worldwide 292 DIGI-KEY Worldwide 1386 MOUSER Worldwide 154 NEWARK Americas 20 TAYLOR Americas 813	$0.56 each at 1K+ pcs	rail of 45

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM320H-12	LM137H	NSCNE	03 Dec 2008
LM320H-12 MWC	NONE	NONE	07 Jun 2001
LM320H-15	LM137H	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM320H-5.0	LM137H	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM320HG-5 MWC	NONE	NONE	07 Jun 2001
LM320K-12	LM137K/883	NSCE	03 Dec 2008
LM320K-15	LM120K-15	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM320K-15 MWC	NONE	NONE	07 Dec 1999
LM320K-5.0	NONE	NONE	08 Sep 1999
LM320KG-5 MDC	NONE	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM320T-12	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM320T-5.0	LAS1815	SEMTECH	16 Nov 2008
LM320T-5.0 MWC	NONE	NONE	02 Dec 2003

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM320.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM320 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM320T-15/NOPB LM320T-15	1991.806 1993.446	TO-220	3	1 1	NA NA	Detail	Download	N/A	NSUZXYTTE# LM320T -15 P+

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM320.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM320 is located at RoHS Status.

CAD Symbols and Models Download LM320 CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM320T-15	SLM	0	44046	0	0	3532500	1	1002356520

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM320.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM320 is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM320H-12	LM137H	NSCNE	03 Dec 2008
LM320H-12 MWC	NONE	NONE	07 Jun 2001
LM320H-15	LM137H	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM320H-5.0	LM137H	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM320HG-5 MWC	NONE	NONE	07 Jun 2001
LM320K-12	LM137K/883	NSCE	03 Dec 2008
LM320K-15	LM120K-15	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM320K-15 MWC	NONE	NONE	07 Dec 1999
LM320K-5.0	NONE	NONE	08 Sep 1999
LM320KG-5 MDC	NONE	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM320T-12	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LM320T-5.0	LAS1815	SEMTECH	16 Nov 2008
LM320T-5.0 MWC	NONE	NONE	02 Dec 2003