LM26 - SOT-23, ±3°C Accurate, Factory Preset Thermostat

	LM26 - SOT-23, ±3°C Accurate, Factory Preset Thermostat from the PowerWise® Family

Datasheet	Packaging	Samples & Pricing	Reliability	Application Notes	Knowledge Base

Features

•	Internal comparator with pin programmable 2°C or 10°C hysteresis
•	No external components required
•	Open Drain or push-pull digital output; supports CMOS logic levels
•	Internal temperature sensor with V_TEMP output pin
•	V_TEMP output allows after-assembly system testing
•	Internal voltage reference and DAC for trip-point setting
•	Currently available in 5-pin SOT-23 plastic package
•	Excellent power supply noise rejection
•	UL Recognized Component

Key Specification

■ Power Supply Voltage	2.7V to 5.5V
■ Power Supply Current	40µA(max) 20µA(typ)
■ Hysteresis Temperature	2°C or 10°C(typ)

Temperature Trip Point Accuracy

Temperature Range	LM26CIM
−55°C to +110°C	±3°C (max)
+120°C	±4°C (max)

General Description

The LM26 is a precision, single digital-output, low-power thermostat comprised of an internal reference, DAC, temperature sensor and comparator. More...

Applications

•	Microprocessor Thermal Management
•	Appliances
•	Portable Battery Powered Systems
•	Fan Control
•	Industrial Process Control
•	HVAC Systems
•	Remote Temperature Sensing
•	Electronic System Protection

Typical Application

click for larger image

Parametric Table expand

Parametric Table collapse

SetPoint Type Fixed

SetPoint Value -25, 50, 120, 90, 85, 95, 75, 70, 115, 0, 45, 105, 100, 65, 110 deg C

Temperature Accuracy (+/-) 3 deg C

Supply Min 2.7 Volt

Temperature Min -55 deg C

Temperature Max 125 deg C

Quiescent Current_ 40 uA

SetPoint Type Fixed

SetPoint Value -25, 50, 120, 90, 85, 95, 75, 70, 115, 0, 45, 105, 100, 65, 110 deg C

Temperature Accuracy (+/-) 3 deg C

Supply Min 2.7 Volt

Temperature Min -55 deg C

Temperature Max 125 deg C

Quiescent Current_ 40 uA

Comparators 1

Sensor Gain -10.82 mV/Deg C

Remote Diode Thermal Sensors Undefined

Supply Max 5.5 Volt

VtempOutput Impedance 18 Ohm

Reference Output Undefined Volt

Quiescent Current 0.04 mA

Automotive Selection Guide Yes

PowerWise Yes

View Using Catalog

Also Recommended

LM26LV	More Accurate
LM27	Higher Max Temperature.
LM56	More Accurate. Resistor Programmable.

Additional Resources

Online Seminars

Thermal Management For High Performance Processor Systems

Application Notes (see below)

Block Diagram

click for larger image

Datasheet

RoHS Compliance Information	Size in Kbytes	Date
LM26 SOT-23, ±3°C Accurate, Factory Preset Thermostat	286 Kbytes	31-Jul-08	View Online Download
LM26 SOT-23, ±3°C Accurate, Factory Preset Thermostat (Japanese)	459 Kbytes

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Package Availability, Models, Samples & Pricing

Part Number

Package

Factory Lead Time

Models

Samples &
Electronic
Orders

Budgetary Pricing

Std
Pack
Size

Package
Marking
Format

Type

Pins

Spec.

MSL
Rating

Peak
Reflow

RoHS
Report

CAD
Symbols

Qty

Qty

$US each

LM26CIM5-DPB

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

N/A

LM26CIM5-HHD

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.40

reel
of
1000

6 weeks

500

LM26CIM5-NPA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

8 weeks

2000

LM26CIM5-PHA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

2000

LM26CIM5-RPA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

2000

LM26CIM5-SHA

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

2000

LM26CIM5-SPA

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

8 weeks

2000

LM26CIM5-TPA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

15000

LM26CIM5-VHA

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

2500

LM26CIM5-VPA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

2000

LM26CIM5-XHA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

2000

LM26CIM5-XPA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

10000

LM26CIM5-YHA

5

STD

NOPB

1

1

260

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

3000

LM26CIM5-YPA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

12 weeks

5000

LM26CIM5-ZHA

5

NOPB

1

260

Full production

N/A

Samples

1K+

$0.43

reel
of
1000

6 weeks

10000

LM26CIM5X-DPB

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

N/A

LM26CIM5X-SPA

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

N/A

LM26CIM5X-HHD

5

NOPB

1

260

Full production

N/A

1K+

$0.40

reel
of
3000

6 weeks

150000

LM26CIM5X-NPA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

5000

LM26CIM5X-PHA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

40000

LM26CIM5X-RPA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

8 weeks

20000

LM26CIM5X-SHA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

8 weeks

N/A

LM26CIM5X-TPA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

10000

LM26CIM5X-VHA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

5000

LM26CIM5X-VPA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

50000

LM26CIM5X-XHA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

8 weeks

N/A

LM26CIM5X-XPA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

25000

LM26CIM5X-YHA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

10000

LM26CIM5X-YPA

5

NOPB

1

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

25000

LM26CIM5X-ZHA

5

STD

NOPB

1

1

260

260

Full production

N/A

1K+

$0.43

reel
of
3000

6 weeks

10000

General Description

The LM26 is a precision, single digital-output, low-power thermostat comprised of an internal reference, DAC, temperature sensor and comparator. Utilizing factory programming, it can be manufactured with different trip points as well as different digital output functionality. The trip point (T_OS) can be preset at the factory to any temperature in the range of −55°C to +110°C in 1°C increments. The LM26 has one digital output (OS/ ^OS/US/ ^US), one digital input (HYST) and one analog output (V_TEMP). The digital output stage can be preset as either open-drain or push-pull. In addition, it can be factory programmed to be active HIGH or LOW. The digital output can be factory programmed to indicate an over temperature shutdown event (OS or ^OS) or an under temperature shutdown event (US or ^US). When preset as an overtemperature shutdown ( ^OS) it will go LOW to indicate that the die temperature is over the internally preset T_OS and go HIGH when the temperature goes below (T_OS–T_HYST). Similarly, when preprogrammed as an undertemperature shutdown (US) it will go HIGH to indicate that the temperature is below T_US and go LOW when the temperature is above (T_US+T_HYST). The typical hysteresis, T_HYST, can be set to 2°C or 10°C and is controlled by the state of the HYST pin. A V_TEMP analog output provides a voltage that is proportional to temperature and has a −10.82mV/°C output slope.

Available parts are detailed in the ordering information. For other part options, contact a National Semiconductor Distributor or Sales Representative for information on minimum order qualification. The LM26 is currently available in a 5-lead SOT-23 package.

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM *	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM26CIM5-DPB	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-HHD	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-NPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-PHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-RPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-SHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-SPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-TPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-VHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-VPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-XHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-XPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-YHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-YPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5-ZHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-DPB	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-HHD	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-NPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-PHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-RPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-SHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-SPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-TPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-VHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-VPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-XHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-XPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-YHA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-YPA	CMOS7	0	13906	0	0	862500	5	244736730
LM26CIM5X-ZHA	CMOS7	0	13906	0	0	862500	5	244736730

Note: The Early Failure Rates were calculated as point estimates. 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.

More Application Notes

Title	Size in Kbytes	Date
AN-1256: Application Note 1256 Tiny Temperature Sensors for Portable Systems	66 Kbytes	1-Oct-02	Download

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

[Information as of 7-Jan-2009]