DS1822 Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS1822 is a digital temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for local temperature measurement across a -55°C to 125°C range with 11-bit resolution. The device communicates via 1-Wire® protocol and operates on 3V to 5.5V supply voltage. The DS1822 is classified as obsolete, making identification of suitable substitute components necessary for ongoing design support and procurement planning. Substitute parts must maintain compatibility with 1-Wire® interface requirements and TO-92-3 packaging specifications while meeting the thermal measurement range and accuracy requirements of the original application.

Key Parameters

Parameter	DS1822
Manufacturer	Analog Devices Inc./Maxim Integrated
Sensor Type	Digital, Local
Sensing Temperature Range	-55°C ~ 125°C
Output Type	1-Wire®
Supply Voltage	3V ~ 5.5V
Resolution	11 bits
Accuracy	±2°C (-10°C ~ 85°C) / ±3°C (-55°C ~ 125°C)
Package	TO-92-3
Mounting Type	Through Hole
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the DS1822 are evaluated based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

Output interface type (1-Wire® protocol requirement)
Sensing temperature range coverage (-55°C to 125°C minimum)
Supply voltage compatibility (3V to 5.5V operation)
Package form factor (TO-92-3 through-hole mounting)
Resolution capability (11-bit minimum)
Accuracy specification within application tolerance

Substitution Logic:

The DS1822+ qualifies as a direct substitute, maintaining identical electrical specifications, temperature range, 1-Wire® interface, and TO-92-3 packaging. The primary distinction is product status (Active vs. Obsolete) and RoHS compliance improvement (ROHS3 Compliant vs. non-compliant).

The TMP04FT9 is classified as a manufacturer-recommended alternative but operates under different electrical parameters. This device uses PWM output instead of 1-Wire® protocol, requires 4.5V to 7V supply voltage, and covers a narrower sensing range (-40°C to 100°C). The TMP04FT9 is suitable only for applications where the interface protocol can be adapted and the thermal range is compatible with -40°C to 100°C operation.

Parameter Comparison

Parameter	DS1822	DS1822+	TMP04FT9
Manufacturer	Analog Devices Inc./Maxim Integrated	Analog Devices Inc./Maxim Integrated	Analog Devices Inc.
Sensor Type	Digital, Local	Digital, Local	Digital, Local
Sensing Temperature Range	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 100°C
Output Type	1-Wire®	1-Wire®	PWM
Supply Voltage	3V ~ 5.5V	3V ~ 5.5V	4.5V ~ 7V
Resolution	11 bits	11 bits	Not specified
Accuracy	±2°C (±3°C)	±2°C (±3°C)	±3°C (±5°C)
Package	TO-92-3	TO-92-3	TO-92-3
Mounting Type	Through Hole	Through Hole	Through Hole
Product Status	Obsolete	Active	Active
RoHS Status	Non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

DS1822+ (Direct Substitute): The DS1822+ is the primary substitute for the DS1822. Both devices share identical electrical specifications, temperature measurement range, 1-Wire® protocol interface, and TO-92-3 packaging. The DS1822+ maintains active product status and achieves ROHS3 compliance, addressing the obsolescence and regulatory compliance limitations of the original DS1822. No circuit modifications are required for DS1822+ integration into existing DS1822 designs.

TMP04FT9 (Manufacturer-Recommended Alternative): The TMP04FT9 is suitable only for applications where the following conditions are met: the sensing temperature range requirement does not exceed -40°C to 100°C, the application can accommodate PWM output instead of 1-Wire® protocol, and the supply voltage can be adjusted to 4.5V to 7V. The TMP04FT9 requires circuit redesign and firmware modification to process PWM signals instead of 1-Wire® data. This device is not a drop-in replacement and should be considered only when application constraints permit interface protocol change.

Frequently Asked Questions (FAQ)

Q: Can DS1822+ be used as a direct replacement for DS1822 without circuit modifications?

A: Yes. The DS1822+ maintains identical electrical specifications, 1-Wire® interface protocol, supply voltage range (3V to 5.5V), temperature measurement range (-55°C to 125°C), resolution (11-bit), and TO-92-3 package form factor. No circuit modifications are required.

Q: What is the primary difference between DS1822 and DS1822+?

A: The DS1822+ is the active production variant with ROHS3 compliance. The DS1822 is classified as obsolete. Both devices are electrically and functionally identical.

Q: Is TMP04FT9 a direct substitute for DS1822?

A: No. The TMP04FT9 uses PWM output instead of 1-Wire® protocol, requires 4.5V to 7V supply voltage instead of 3V to 5.5V, and covers a narrower temperature range (-40°C to 100°C instead of -55°C to 125°C). Circuit redesign and firmware modification are required for TMP04FT9 integration.

Q: What are the critical parameters for DS1822 substitution?

A: The critical parameters are output interface type (1-Wire® protocol), sensing temperature range (-55°C to 125°C), supply voltage (3V to 5.5V), package form factor (TO-92-3), resolution (11-bit), and accuracy specification (±2°C to ±3°C).

Q: Can TMP04FT9 be used if the application only requires -40°C to 100°C temperature measurement?

A: TMP04FT9 can be considered only if the application can accommodate PWM output signal processing and the supply voltage can be adjusted to 4.5V to 7V. The narrower temperature range is compatible with -40°C to 100°C applications, but the interface protocol change requires firmware modification.

Q: What is the packaging specification for all three devices?

A: All three devices (DS1822, DS1822+, TMP04FT9) use TO-92-3 package with through-hole mounting type.

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