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

Also Recommended LM4120 Lower Supply Current, Lower Temperature Coefficient & Enable Pin LM4125 Lower Supply Current, Lower Temperature Coefficient LM4128 Lower Supply Current, Lower Temperature Coefficient & Enable Pin LM4132 Lower Supply Current, Lower Temperature Coefficient & Enable Pin MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LMV431/LMV431A/LMV431B Low-Voltage (1.24V) Adjustable Precision Shunt Regulators	943 Kbytes	27-May-05	日本語

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Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Standard Pack Size
LMV431CM5/NOPB LMV431CM5 RoHS	SOT-23	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 2000 DIGIKEY Worldwide 835 FARNELL Europe and Asia 653 FUTURE Worldwide 600 NEWARK Americas 984	$0.17 each at 1K+ pcs	reel of 1000
LMV431IM5/NOPB LMV431IM5 RoHS	SOT-23	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 1000 AVNET-EM Worldwide 1000 DIGIKEY Worldwide 1522 FARNELL Europe and Asia 3219 FUTURE Worldwide 1100 NEWARK Americas 1990 TAYLOR Americas 7000	$0.17 each at 1K+ pcs	reel of 1000
LMV431CM5X/NOPB LMV431CM5X RoHS	SOT-23	Full production Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0 TAYLOR Americas 9000	$0.17 each at 1K+ pcs	reel of 3000
LMV431IM5X/NOPB RoHS	SOT-23	Full production Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 0 FUTURE Worldwide 1100	$0.17 each at 1K+ pcs	reel of 3000
LMV431IZ/NOPB RoHS		Lifetime buy Lead Time: 8 weeks	Distributor Region Qty DIGIKEY Worldwide 146 FARNELL Europe and Asia 2828 TAYLOR Americas 7200	$0.19 each at 1K+ pcs	box of 1800
LMV431CZ/NOPB RoHS		Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 2553 DIGIKEY Worldwide 3306 FARNELL Europe and Asia 2073 TAYLOR Americas 7500	$0.19 each at 1K+ pcs	box of 1800

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMV431ACZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431BCZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431IZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009

Design Tools

Title	Size	Date
LMV431 Qualification Package	792 Kbytes	24-Jun-1999

Reference Design

RD-166 - Load Detecting Power Supply

RD-168 - Ambient Light Adaptive LED Driver

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LMV431CM5	LB300	0	33664	0	0	3830500	1	1086914834
LMV431CM5X	LB300	0	33664	0	0	3830500	1	1086914834
LMV431CZ	LB300	0	33664	0	0	3830500	1	1086914834
LMV431IM5	LB300	0	33664	0	0	3830500	1	1086914834
LMV431IM5X	LB300	0	33664	0	0	3830500	1	1086914834
LMV431IZ	LB300	0	33664	0	0	3830500	1	1086914834

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.

Obsolete Versions

Obsolete Part	Alternate Part or Supplier	Source	Last Time Buy Date
LMV431ACZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431BCZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009
LMV431IZ	NONE	NATIONAL SEMICONDUCTOR	01 Dec 2009