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Status
Part Number	Status
DS1621	Active: In Production. But some versions of the family are No Longer Available. See Ordering Information.

Data Sheet

FULL DATA SHEET (PDF, 248kB) Download   E-Mail

Description

The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, TOUT is active when the temperature of the device exceeds a user-defined temperature TH. The output remains active until the temperature drops below user defined temperature TL, allowing for any hysteresis necessary. User-defined temperature settings are stored in nonvolatile memory so parts may be programmed prior to insertion in a system. Temperature settings and temperature readings are all communicated to/from the DS1621 over a simple 2-wire serial interface.

Key Features		Applications/Uses
Temperature measurements require no external components Measures temperatures from -55°C to +125°C in 0.5°C increments. Fahrenheit equivalent is -67°F to 257°F in 0.9°F increments Temperature is read as a 9-bit value (2-byte transfer) Wide power supply range (2.7V to 5.5V) Converts temperature to digital word in less than 1 second Thermostatic settings are user definable and nonvolatile Data is read from/written via a 2-wire serial interface (open drain I/O lines) Applications include thermostatic controls, industrial systems, consumer products, thermometers, or any thermal sensitive system 8-pin DIP or SO package (150mil and 208mil)		Medical Networking Personal Computing Routers/Switches Test Measurement Systems Wireless Base Stations

Diagram

Functional Block Diagram

Application Notes

Application Note 127: Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS1621 - DS1621 Application Note 176: Using the DS1631 Temperature Sensor in DS1621 Applications - DS1621 Application Note 3489: Installing the DS9123O USB Adapter on Windows® 98 - DS1621 Application Note 3930: Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors - DS1621

Design Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report: DS1621.pdf

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-14 of 14

DS1621	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1621C		N/A	No Longer Available	DS1621S+	Land Pattern: Not Available	-55°C to +125°C	See data sheet
DS1621C-A7-W		N/A	No Longer Available		Land Pattern: Not Available	-55°C to +125°C	See data sheet
DS1621			Active		PDIP(N);8 pin;81.9 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P8-4*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1621+			Active		PDIP(N);8 pin;79.7 mm² Outline Drawing: 21-0043 (PDF) Land Pattern: Not Applicable Use pkgcode/variation: P8+1*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621S+W			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621S/T&R+W			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621S			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-4*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1621S/T&R			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8-4*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1621S+T&R			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621V			Active		SOIC (W);8 pin;44.1 mm² Land Pattern: Not Available Use pkgcode/variation: W8-3*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1621S+			Active		SOIC(N);8 pin;30.9 mm² Outline Drawing: 21-0041 (PDF) Land Pattern: 90-0096 (PDF) Use pkgcode/variation: S8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621V+			Active		SOIC (W);8 pin;44.1 mm² Land Pattern: Not Available Use pkgcode/variation: W8+3*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621V/T&R			Active		SOIC (W);8 pin;44.1 mm² Land Pattern: Not Available Use pkgcode/variation: W8-3*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1621V+T&R			Active		SOIC (W);8 pin;44.1 mm² Land Pattern: Not Available Use pkgcode/variation: W8+3*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis

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Temperature Family by Product Type

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