Features Line regulation of 0.04%/V Load regulation of 0.01%/mA Output voltage tolerances of ±2% at Tj = 25°C and ±4% over the temperature range (LM140LA) ±3% over the temperature range (LM340LA) Output current of 100 mA Internal thermal overload protection Output transistor safe area protection Internal short circuit current limit Available in metal TO-39 low profile package (LM140LA/LM340LA) and plastic TO-92 (LM340LA) Description The LM140L series of three terminal positive regulators is available with several fixed output voltages making them useful in a wide range of applications. The LM140LA is an improved version of the LM78LXX series with a tighter output voltage tolerance (specified over the full military temperature range), higher ripple rejection, better regulation and lower quiescent current. The LM140LA regulators have ±2% VOUT specification, 0.04%/V line regulation, and 0.01%/mA load regulation. When used as a zener diode/resistor combination replacement, the LM140LA usually results in an effective output impedance improvement of two orders of magnitude, and lower quiescent current. These regulators can provide local on card regulation, eliminating the distribution problems associated with single point regulation. The voltages available allow the LM140LA to be used in logic systems, instrumentation, Hi-Fi, and other solid state electronic equipment. Although designed primarily as fixed voltage regulators, these devices can be used with external components to obtain adjustable voltages and currents. The LM140LA/LM340LA are available in the low profile metal three lead TO-39 (H) and the LM340LA are also available in the plastic TO-92 (Z). With adequate heat sinking the regulator can deliver 100 mA output current. Current limiting is included to limit the peak output current to a safe value. Safe area protection for the output transistor is provided to limit internal power dissipation. If internal power dissipation becomes too high for the heat sinking provided, the thermal shut-down circuit takes over, preventing the IC from overheating. For applications requiring other voltages, see LM117L Data Sheet.

Typical Application click for larger image	Connection Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM340L Series 3-Terminal Positive Regulators	618 Kbytes	19-Jul-05

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM340LAZ-5.0/NOPB RoHS Status	TO-92	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 17 AVNET-EM Worldwide 2030 DIGI-KEY Worldwide 2653 MOUSER Worldwide 1770 NEWARK Americas 267 TAYLOR Americas 6034	$0.30 each at 1K+ pcs	box of 1800

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM340LAH-12	LM140H-12/883	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM340LAH-15	NONE	NONE	08 Sep 1999
LM340LAH-5.0	LM140H-5.0/883	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM340LAZ-12	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM340LAZ-15	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008

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 LM340L.

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 LM340L 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
LM340LAZ-5.0/NOPB	201.662 202.003	TO-92	3	1	NA	Detail	N/A	N/A	NSXYTT 340LA Z-5.0

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 LM340L.

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 LM340L is located at RoHS Status.

CAD Symbols and Models N/A

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM340LAZ-5.0	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 LM340L.

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 LM340L is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LM340LAH-12	LM140H-12/883	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM340LAH-15	NONE	NONE	08 Sep 1999
LM340LAH-5.0	LM140H-5.0/883	NATIONAL SEMICONDUCTOR	03 Dec 2008
LM340LAZ-12	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008
LM340LAZ-15	NONE	NATIONAL SEMICONDUCTOR	16 Nov 2008