Maxim > Products > Sensors > DS1621
Maxim > Products > Thermal Management > DS1621

DS1621

Digital Thermometer and Thermostat

Overview

Technical Documents

Ordering Info

Status

Part Number	Status
DS1621	Active: In Production. See Ordering Information for details.

Description

The DS1621 Digital Thermometer and Thermostat provides 9-bit temperature readings, which indicate the temperature of the device. The thermal alarm output, T_OUT is active when the temperature of the device exceeds a user-defined temperature T_H. The output remains active until the temperature drops below user defined temperature T_L, 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.

Data Sheet

Download	Rev 3	(PDF, 248kB)
E-Mail

Key Features

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)

Applications/Uses

Medical
Networking
Personal Computing
Routers/Switches
Test Measurement Systems
Wireless Base Stations

Key Specifications:

Temperature Sensors

Part Number

Sensor Type

Functions

Interface

Accuracy
(±°C)

Parasite Pwr.

Temp. Thresh.

Temp. Resolution
(bits)

Multi Droppable

Oper. Temp.
(°C)

Smallest Available Pckg.
(mm²)

Budgetary Price

max w/pins

See Notes

DS1621

Local

Single Temperature Alarm

2-Wire/I²C/SMBus

0.5

Programmable (NV)

Yes

-55 to +125

30.9

$2.01 @1k

See All Temperature Sensors (103)

Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Diagram

Functional Block Diagram

Application Notes

Application Note 127		Reverse Compatibility of the DS1721 Digital Temperature Sensor with the DS1621
Application Note 176		Using the DS1631 Temperature Sensor in DS1621 Applications
Application Note 3930		Package Thermal Resistance Values (Theta JA, Theta JC) for Dallas Semiconductor Temperature Sensors
Tutorial 4679		Thermal Management Handbook

Product Guides

Thermal Management (PDF)

Reliability Reports

Reliability Report:

DS1621.pdf

Software/Models

none

Ordering Information

Filters:

Part Number:

Package:

Temperature:

Tape and Reel

Sample

Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
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
DS1621C		N/A	No Longer Available	DS1621S+	CDIP; Land Pattern: Not Available	-55°C to +125°C	See data sheet
DS1621C-A7-W		N/A	No Longer Available		CDIP; Land Pattern: Not Available	-55°C to +125°C	See data sheet
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+			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			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+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			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+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
Part Number	Free Sample	Buy	Status	Recommended Replacement	Package: TYPE PINS FOOTPRINT DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
DS1621V			Active		SOIC;8 pin;44.1 mm² Outline Drawing:21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8-2*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis
DS1621V+			Active		SOIC;8 pin;44.1 mm² Outline Drawing:21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621V+T&R			Active		SOIC;8 pin;44.1 mm² Outline Drawing:21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8+2*	-55°C to +125°C	RoHS/Lead-Free: Lead Free Materials Analysis
DS1621V/T&R			Active		SOIC;8 pin;44.1 mm² Outline Drawing:21-0262 (PDF) Land Pattern: 90-0258 (PDF) Use pkgcode/variation: W8-2*	-55°C to +125°C	RoHS/Lead-Free: No Materials Analysis

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; -D = drypack; -U/+U on DS parts = cut tape. More: See Full Data Sheet or Maxim Product 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.

Similar Products by Function

DS1721	Digital Thermometer and Thermostat
DS1631, DS1631A, DS1731	High-Precision Digital Thermometer and Thermostat
See All Temperature Sensors (109 Products)

More Information

Temperature Family by Product Type

Didn't Find What You Need?

Next Day Product Selection Assistance from Applications Engineers
Parametric Search
Applications Help

Information Index

Overview		Technical Documents		Ordering Info		Related Products
Description Key Features Applications/Uses Key Specifications Diagram Notes and Comments		Data Sheet Application Notes Evaluation Kits Product Guides Reliability Reports Software/Models		Price and Availability Samples Buy Online Package Information Lead-Free Information		Similar Products by Function Similar Products by Application Evaluation Kits Products with Similar Part Numbers Products Used With This

Rev 3; 2005-09-15
This page last modified: 2009-10-23