LM555 - Timer
Datasheet Packaging Samples & Pricing Reliability Application Notes Knowledge Base

Features
•Direct replacement for SE555/NE555
•Timing from microseconds through hours
•Operates in both astable and monostable modes
•Adjustable duty cycle
•Output can source or sink 200 mA
•Output and supply TTL compatible
•Temperature stability better than 0.005% per °C
•Normally on and normally off output
•Available in 8-pin MSOP package

General Description

The LM555 is a highly stable device for generating accurate time delays or oscillation. More...


Applications

•Precision timing
•Pulse generation
•Sequential timing
•Time delay generation
•Pulse width modulation
•Pulse position modulation
•Linear ramp generator
  Typical Application
*click for larger image


ParametersValues
Temperature Min 0 deg C
Temperature Max 70 deg C


Typical Performance

click for larger image


  Also Recommended
LMC555▲CMOS Version
Additional Resources
Application Notes


Connection Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM555 Timer 825
Kbytes		 12-Jul-06 Download
LM555JAN Timer 825
Kbytes		 26-Jul-06 Download
LM555QML Timer 823
Kbytes		 26-Jul-06 Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders		Budgetary PricingStd
Pack
Size		Package
Marking
Format
TypePinsSpec.MSL
Rating		Peak
Reflow		RoHS
Report		CAD
Symbols		WeeksQtyQty$US each
LM555CMSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.39rail
of
95		NSZXTT
LM
555CM
8 weeks2000
LM555CMXSOIC NARROW8NOPB
STD		1
1		260
235		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.39reel
of
2500		NSZXTT
LM
555CM
8 weeks7500
LM555CMMMINI SOIC8NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.38reel
of
1000		ZXTT
Z55
8 weeks2500
LM555CMMXMINI SOIC8NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.38reel
of
3500		ZXTT
Z55
6 weeks5000
LM555CNMDIP8NOPB
STD		1
1		NA
NA		RoHS Download Full productionN/A
 
Buy Now 		1K+$0.44rail
of
40		NSUZXYTTE#
LM
555CN
8 weeks2500
LM555 MD8Unpackaged DieLifetime buyN/A
  CALLtray
of
N/A		-
6 weeks2000
LM555H/883TO-998STD1NARoHS Download Full productionN/A
 
Buy Now 		50+$15.10tray
of
20		NSZSSXXYYA LM555H/883 Q
18 weeks500
LM555J/883CERDIP8STD1NARoHS Download Full productionN/A
 
Buy Now 		50+$9.60rail
of
40		NSZSSXXYYA
LM555J/
883 Q
15 weeks500

Obsolete Versions

Obsolete PartAlternate Part or SupplierSourceLast Time Buy Date
LM555CJ
NONE
NONE
08 Sep 1998
LM555H-MLS
LM555H/883
NATIONAL SEMICONDUCTOR
03 Dec 2008
LM555J
NONE
NONE
08 Sep 1998
LM555J-MLS
NONE
NONE
08 Sep 1998

General Description

The LM555 is a highly stable device for generating accurate time delays or oscillation. Additional terminals are provided for triggering or resetting if desired. In the time delay mode of operation, the time is precisely controlled by one external resistor and capacitor. For astable operation as an oscillator, the free running frequency and duty cycle are accurately controlled with two external resistors and one capacitor. The circuit may be triggered and reset on falling waveforms, and the output circuit can source or sink up to 200mA or drive TTL circuits.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM555CMSLM04404600353250011002356520
LM555CMMSLM04404600353250011002356520
LM555CMMXSLM04404600353250011002356520
LM555CMXSLM04404600353250011002356520
LM555CNSLM04404600353250011002356520

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.


Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-694: Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200 408
Kbytes		 26-Sep-02 Download
AN-694 (Japanese): Application Note 694 A DMOS 3A, 55V, H-Bridge: The LMD18200
 400 Kbytes   Download

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More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1566: Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs 370
Kbytes		 7-Feb-07 Download
AN-1566 (Japanese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
 442 Kbytes   Download
AN-1566 (Chinese): Application Note 1566 Techniques for Thermal Analysis of Switching Power Supply Designs
 282 Kbytes  

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[Information as of 7-Nov-2009]