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 Products > Analog - Regulators > Linear Regulators - Low Dropout Voltage > Positive Voltage - Fixed > LM2940

LM2940  Product Folder

1A Low Dropout Regulator
Generic P/N 2940
General
Description		 Features Datasheet Package
& Models		 Samples
& Pricing		 Reliability
Metrics		 Application
Notes

Parametric Table Parametric Table
Temperature Min (deg C) -55 
Temperature Max (deg C) 125 
Multiple Output Capability No 
On/Off Pin No 
Error Flag No 
InputMin Voltage (Volt) - 
InputMax Voltage (Volt) 26 
Output Current (mA) 1000 
Dropout Voltage (Volt) .50 
Quiescent Current (mA) 10 
SecondaryOutput Voltage (Volt) - 
SecondaryOutput Current (Amp) - 
RegType LDO 
Output Voltage (Volt) 10, 12, 15, 5, 8, 9 
Watchdog - 

Datasheet

TitleSize in KbytesDate
View Online
Download
Receive via Email
LM2940 LM2940C 1A Low Dropout Regulator 504 Kbytes 27-Jan-03 View Online Download Receive via Email
LM2940 LM2940C 1A Low Dropout Regulator (JAPANESE)
 772 Kbytes   View Online Download Receive via Email
LM2940 Mil-Aero Datasheet MNLM2940-12-X 261 Kbytes   View Online Download Receive via Email
LM2940 Mil-Aero Datasheet MNLM2940-15-X 261 Kbytes   View Online Download Receive via Email
LM2940 Mil-Aero Datasheet MNLM2940-5.0-X 262 Kbytes   View Online Download Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

Package Availability, Models, Samples & Pricing

Part NumberPackageStatusModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
TypePinsMSL/Lead-Free AvailabilityLead
Time		QtySPICEIBISQty$US each
LM2940LD-10LLP8StatusFull productionN/AN/ASamples
Buy Now		1K+$0.66reel
of
1000		NS
UZXYTT
L00017B
6-8 weeks50000
LM2940LD-12LLP8StatusFull productionN/AN/ASamples
Buy Now		1K+$0.66reel
of
1000		NS
UZXYTT
L00018B
11-13 weeks50000
LM2940LD-15LLP8StatusFull productionN/AN/ASamples
Buy Now		1K+$0.66reel
of
1000		NS
UZXYTT
L00019B
6-8 weeks50000
LM2940LD-5.0LLP8StatusFull productionN/AN/ASamples1K+$0.66reel
of
1000		NS
UZXYTT
L00014B
11-13 weeks50000
LM2940LD-8.0LLP8StatusFull productionN/AN/ASamples
Buy Now		1K+$0.66reel
of
1000		NS
UZXYTT
L00015B
11-13 weeks50000
LM2940LD-9.0LLP8StatusFull productionN/AN/ASamples
Buy Now		1K+$0.66reel
of
1000		NS
UZXYTT
L00016B
6-8 weeks50000
LM2940LDX-10LLP8StatusFull productionN/AN/A 1K+$0.66reel
of
4500		NS
UZXYTT
L00017B
6-8 weeks50000
LM2940LDX-12LLP8StatusFull productionN/AN/A 1K+$0.66reel
of
4500		NS
UZXYTT
L00018B
11-13 weeks50000
LM2940LDX-15LLP8StatusFull productionN/AN/A 1K+$0.66reel
of
4500		NS
UZXYTT
L00019B
6-8 weeks50000
LM2940LDX-5.0LLP8StatusFull productionN/AN/A 1K+$0.66reel
of
4500		NS
UZXYTT
L00014B
11-13 weeks50000
LM2940LDX-8.0LLP8StatusFull productionN/AN/A 1K+$0.66reel
of
4500		NS
UZXYTT
L00015B
11-13 weeks50000
LM2940LDX-9.0LLP8StatusFull productionN/AN/A 1K+$0.66reel
of
4500		NS
UZXYTT
L00016B
6-8 weeks50000
LM2940IMP-10SOT-2234StatusFull productionN/AN/A24 Hour Samples
Buy Now		1K+$0.80reel
of
1000		XYTT
L55B
16 weeks0
LM2940IMP-12SOT-2234StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.80reel
of
1000		XYTT
L56B
16 weeks0
LM2940IMP-15SOT-2234StatusFull productionN/AN/ASamples1K+$0.80reel
of
1000		XYTT
L70B
16 weeks0
LM2940IMP-5.0SOT-2234StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.80reel
of
1000		XYTT
L53B
16 weeks0
LM2940IMP-8.0SOT-2234StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.80reel
of
1000		XYTT
L54B
16 weeks0
LM2940IMP-9.0SOT-2234StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.80reel
of
1000		XYTT
L0EB
16 weeks0
LM2940IMPX-10SOT-2234StatusFull productionN/AN/A 
Buy Now		1K+$0.80reel
of
2000		XYTT
L55B
16 weeks0
LM2940IMPX-12SOT-2234StatusFull productionN/AN/A 
Buy Now		1K+$0.80reel
of
2000		XYTT
L56B
16 weeks0
LM2940IMPX-15SOT-2234StatusFull productionN/AN/A 1K+$0.80reel
of
2000		XYTT
L70B
16 weeks0
LM2940IMPX-5.0SOT-2234StatusFull productionN/AN/A 1K+$0.80reel
of
2000		XYTT
L53B
16 weeks0
LM2940IMPX-8.0SOT-2234StatusFull productionN/AN/A 
Buy Now		1K+$0.80reel
of
2000		XYTT
L54B
17 weeks0
LM2940IMPX-9.0SOT-2234StatusFull productionN/AN/A 1K+$0.80reel
of
2000		XYTT
L0EB
16 weeks0
LM2940T-10.0TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.52rail
of
45		NSUZXYTT
LM2940T
10.0 P+
3-5 weeks50000
LM2940T-12.0TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.52rail
of
45		NSUZXYTT
LM2940T
12.0 P+
7-9 weeks50000
LM2940T-5.0TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.52rail
of
45		NSUZXYTT
LM2940T
-5.0 P+
10-12 weeks150000
LM2940T-8.0TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.52rail
of
45		NSUZXYTT
LM2940T
-8.0 P+
3-5 weeks50000
LM2940T-9.0TO 2203StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.52rail
of
45		NSUZXYTT
LM2940T
-9.0 P+
3-5 weeks50000
LM2940S-10TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.67rail
of
45		NSUZXYTT
LM2940S
-10 P+
13 weeks0
LM2940S-12TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.67rail
of
45		NSUZXYTT
LM2940S
-12 P+
13 weeks0
LM2940S-5.0TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.67rail
of
45		NSUZXYTT
LM2940S
-5.0 P+
13 weeks0
LM2940S-8.0TO 2633StatusFull productionN/AN/A24 Hour Samples
Buy Now 		1K+$0.67rail
of
45		NSUZXYTT
LM2940S
-8.0 P+
13 weeks0
LM2940S-9.0TO 2633StatusFull productionN/AN/ASamples
Buy Now 		1K+$0.67rail
of
45		NSUZXYTT
LM2940S
-9.0 P+
13 weeks0
LM2940SX-10TO 2633StatusFull productionN/AN/A 1K+$0.67reel
of
500		NSUZXYTT
LM2940S
-10 P+
13 weeks0
LM2940SX-12TO 2633StatusFull productionN/AN/A 1K+$0.67reel
of
500		NSUZXYTT
LM2940S
-12 P+
13 weeks0
LM2940SX-5.0TO 2633StatusFull productionN/AN/A 
Buy Now 		1K+$0.67reel
of
500		NSUZXYTT
LM2940S
-5.0 P+
14 weeks0
LM2940SX-8.0TO 2633StatusFull productionN/AN/A 1K+$0.67reel
of
500		NSUZXYTT
LM2940S
-8.0 P+
13 weeks0
LM2940SX-9.0TO 2633StatusFull productionN/AN/A 1K+$0.67reel
of
500		NSUZXYTT
LM2940S
-9.0 P+
13 weeks0
5962-9088401QEACERDIP16StatusFull productionN/AN/A 25+$11.70rail
of
25		NSZSSXXYYA>
LM2940J-12/883Q
5962-9088401QEA
8-15 weeks0
5962-9088501QEACERDIP16StatusFull productionN/AN/A 25+$11.70rail
of
25		NSZSSXXYYA>
LM2940J-15/883Q
5962-9088501QEA
8-15 weeks0
5962-8958701EACERDIP16StatusFull productionN/AN/A 25+$11.70rail
of
25		NSZSSXXYYA>
LM2940J-5.0/883Q
5962-8958701EA
8-15 weeks0
5962-9088401QXACERPACK16StatusFull productionN/AN/A 250+$14.90tray
of
42		NSZSSXXYYA>
LM2940WG-12/
883Q 5962-
9088401QXA
8-12 weeks500
5962-9088501QXACERPACK16StatusFull productionN/AN/A 250+$14.90tray
of
42		NSZSSXXYYA>
LM2940WG-15/
883Q 5962-
9088501QXA
8-11 weeks500
LM2940WG5.0/883CERPACK16StatusFull productionN/AN/A 250+$14.90tray
of
42		NSZSSXXYYA>
LM2940WG5.0/
883Q 5962-
8958701XA
10-15 weeks500
LM2940-5.0 MD8Unpackaged DieFull productionN/AN/A   tray
of
N/A		-
N/A0
LM2940-15 MD8Unpackaged DieFull productionN/AN/ASamples  tray
of
N/A		-
N/A0
LM2940-15 MW8WaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0
LM2940-5.0 MW8WaferFull productionN/AN/A   wafer jar
of
N/A		-
N/A0

Obsolete Parts

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM2940K-12/883
LM2940J-12/883
NATIONAL SEMICONDUCTOR
09/08/99
LM2940K-15-MIL
LM2940J-15/883
NATIONAL SEMICONDUCTOR
09/08/99
LM2940K-15/883
LM2940J-15/883
NATIONAL SEMICONDUCTOR
12/07/99
LM2940K-5.0/883
LM2940J-5.0/883
NATIONAL SEMICONDUCTOR
09/08/99
LM2940K-8.0/883
LM2940J-8.0/883
NATIONAL SEMICONDUCTOR
09/08/99

General Description

The LM2940/LM2940C positive voltage regulator features the ability to source 1A of output current with a dropout voltage of typically 0.5V and a maximum of 1V over the entire temperature range. Furthermore, a quiescent current reduction circuit has been included which reduces the ground current when the differential between the input voltage and the output voltage exceeds approximately 3V. The quiescent current with 1A of output current and an input-output differential of 5V is therefore only 30 mA. Higher quiescent currents only exist when the regulator is in the dropout mode (VIN - VOUT <= 3V).

Designed also for vehicular applications, the LM2940/LM2940C and all regulated circuitry are protected from reverse battery installations or 2-battery jumps. During line transients, such as load dump when the input voltage can momentarily exceed the specified maximum operating voltage, the regulator will automatically shut down to protect both the internal circuits and the load. The LM2940/LM2940C cannot be harmed by temporary mirror-image insertion. Familiar regulator features such as short circuit and thermal overload protection are also provided.

Features

  • Dropout voltage typically 0.5V @IO = 1A
  • Output current in excess of 1A
  • Output voltage trimmed before assembly
  • Reverse battery protection
  • Internal short circuit current limit
  • Mirror image insertion protection
  • P+ Product Enhancement tested

Reliability Metrics

Part Number Process Early Failure Rate - Rejects Sample Size (EFR) PPM * Rel. Rejects Device Hours Long Term Failure Rates (FITS) MTTF
LM2940IMP-10SLM0350000015000003424108012
LM2940IMP-12SLM0350000015000003424108012
LM2940IMP-15SLM0350000015000003424108012
LM2940IMP-5.0SLM0350000015000003424108012
LM2940IMP-8.0SLM0350000015000003424108012
LM2940IMP-9.0SLM0350000015000003424108012
LM2940IMPX-10SLM0350000015000003424108012
LM2940IMPX-12SLM0350000015000003424108012
LM2940IMPX-15SLM0350000015000003424108012
LM2940IMPX-5.0SLM0350000015000003424108012
LM2940IMPX-8.0SLM0350000015000003424108012
LM2940IMPX-9.0SLM0350000015000003424108012
LM2940LD-10SLM0350000015000003424108012
LM2940LD-12SLM0350000015000003424108012
LM2940LD-15SLM0350000015000003424108012
LM2940LD-5.0SLM0350000015000003424108012
LM2940LD-8.0SLM0350000015000003424108012
LM2940LD-9.0SLM0350000015000003424108012
LM2940LDX-10SLM0350000015000003424108012
LM2940LDX-12SLM0350000015000003424108012
LM2940LDX-15SLM0350000015000003424108012
LM2940LDX-5.0SLM0350000015000003424108012
LM2940LDX-8.0SLM0350000015000003424108012
LM2940LDX-9.0SLM0350000015000003424108012
LM2940S-10SLM0350000015000003424108012
LM2940S-12SLM0350000015000003424108012
LM2940S-5.0SLM0350000015000003424108012
LM2940S-8.0SLM0350000015000003424108012
LM2940S-9.0SLM0350000015000003424108012
LM2940SX-10SLM0350000015000003424108012
LM2940SX-12SLM0350000015000003424108012
LM2940SX-5.0SLM0350000015000003424108012
LM2940SX-8.0SLM0350000015000003424108012
LM2940SX-9.0SLM0350000015000003424108012
LM2940T-10.0SLM0350000015000003424108012
LM2940T-12.0SLM0350000015000003424108012
LM2940T-5.0SLM0350000015000003424108012
LM2940T-8.0SLM0350000015000003424108012
LM2940T-9.0SLM0350000015000003424108012

For more information on Reliablitity Metrics, please click here.


Application Notes

TitleSize in KbytesDate
View Online
Download
Receive via Email
AN-1148: Application Note 1148 Linear Regulators: Theory of Operation and Compensation 200 Kbytes 25-Sep-02 View Online Download Receive via Email

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 15-Jan-2004]

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