Features Low Voltage Operation/Wide Adjust Range (1.24V/30V) 0.5% Initial Tolerance (LMV431B) Temperature Compensated for Industrial Temperature Range (39 PPM/°C for the LMV431AI) Low Operation Current (55µA) Low Output Impedance (0.25) Fast Turn-On Response Low Cost Description The LMV431, LMV431A and LMV431B are precision 1.24V shunt regulators capable of adjustment to 30V. Negative feedback from the cathode to the adjust pin controls the cathode voltage, much like a non-inverting op amp configuration (Refer to Symbol and Functional diagrams). A two resistor voltage divider terminated at the adjust pin controls the gain of a 1.24V band-gap reference. Shorting the cathode to the adjust pin (voltage follower) provides a cathode voltage of a 1.24V. The LMV431, LMV431A and LMV431B have respective initial tolerances of 1.5%, 1% and 0.5%, and functionally lends themselves to several applications that require zener diode type performance at low voltages. Applications include a 3V to 2.7V low drop-out regulator, an error amplifier in a 3V off-line switching regulator and even as a voltage detector. These parts are typically stable with capacitive loads greater than 10nF and less than 50pF. The LMV431, LMV431A and LMV431B provide performance at a competitive price. Applications Shunt Regulator Series Regulator Current Source or Sink Voltage Monitor Error Amplifier 3V Off-Line Switching Regulator Low Dropout N-Channel Series Regulator

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

Datasheets

Title		Size	Date	Other Language
	LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators	943 Kbytes	27-May-05	日本語

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMV431BCM5/NOPB LMV431BCM5 RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 3000 DIGI-KEY Worldwide 0 MOUSER Worldwide 1996 TAYLOR Americas 3000 TECHMOSA Asia Pacific 800	$0.28 each at 1K+ pcs	reel of 1000
LMV431BCM5X/NOPB LMV431BCM5X RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty AECO TECH Asia Pacific 1000 DIGI-KEY Worldwide 0 RSL MICRO Asia Pacific 3000	$0.28 each at 1K+ pcs	reel of 3000
LMV431BIMF/NOPB LMV431BIMF RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 15976 AVNET-EM Worldwide 2000 DIGI-KEY Worldwide 3616 FARNELL Europe and Asia 2803 MOUSER Worldwide 1915 NEWARK Americas 782 TAYLOR Americas 15976 TECHMOSA Asia Pacific 1000	$0.37 each at 1K+ pcs	reel of 1000
LMV431BIMFX/NOPB LMV431BIMFX RoHS Status	SOT-23	Full production Lead Time: 6 weeks	Distributor Region Qty AVNET-EM Worldwide 2885 DIGI-KEY Worldwide 0 MOUSER Worldwide 3000	$0.37 each at 1K+ pcs	reel of 3000

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMV431BCZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

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 LMV431B.

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 LMV431B 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
LMV431BCM5/NOPB LMV431BCM5	14.696 14.801	SOT-23	5	1 1	260 260	Detail	N/A	N/A	N09C XTT
LMV431BCM5X/NOPB LMV431BCM5X	14.696 14.801	SOT-23	5	1 1	260 260	Detail	N/A	N/A	N09C XTT
LMV431BIMF/NOPB LMV431BIMF	10.34 10.399	SOT-23	3	1 1	260 260	Detail	N/A	N/A	RLB XTT
LMV431BIMFX/NOPB LMV431BIMFX	10.34 10.399	SOT-23	3	1 1	260 260	Detail	N/A	N/A	RLB XTT

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 LMV431B.

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 LMV431B 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)
LMV431BCM5	LB300	0	34371	0	0	4164500	1	1181688246
LMV431BCM5X	LB300	0	34371	0	0	4164500	1	1181688246
LMV431BIMF	LB300	0	34371	0	0	4164500	1	1181688246
LMV431BIMFX	LB300	0	34371	0	0	4164500	1	1181688246

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 LMV431B.

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 LMV431B is located at RoHS Status.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMV431BCZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009