TMP422AIDCNTG4 Equivalent & Substitute Parts

Part Overview

The TMP422AIDCNTG4 is a digital temperature sensor manufactured by Texas Instruments, designed for local and remote temperature monitoring applications. This component operates across a -40°C to 125°C range with SMBus output interface and 11-bit resolution. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support, design updates, and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	TMP422AIDCNTG4
Manufacturer	Texas Instruments
Category	Temperature Sensors
Sensor Type	Digital, Local/Remote
Sensing Temperature - Local	-40°C ~ 125°C
Sensing Temperature - Remote	-64°C ~ 191°C
Output Type	SMBus
Voltage - Supply	2.7V ~ 5.5V
Resolution	11 b
Features	One-Shot, Output Switch, Programmable Limit, Shutdown Mode
Accuracy	±1.5°C (±2.5°C)
Operating Temperature	-40°C ~ 125°C
Package / Case	SOT-23-8
Mounting Type	Surface Mount
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL Rating	2 (1 Year)

Substitute Part Grouping Explanation

Substitute parts for the TMP422AIDCNTG4 are identified based on strict electrical and mechanical compatibility criteria. The following parameters define acceptable substitution:

Sensor Type: Digital, Local/Remote
Temperature Range - Local: -40°C ~ 125°C
Temperature Range - Remote: -64°C ~ 191°C
Output Interface: SMBus
Supply Voltage: 2.7V ~ 5.5V
Package: SOT-23-8
Mounting: Surface Mount
Base Product Number: TMP422

Substitute parts may differ in resolution (11-bit vs. 12-bit), packaging format (Cut Tape vs. Tape & Reel), and product status (Active vs. Obsolete), provided all electrical parameters and physical package specifications remain compatible.

Parameter Comparison

Parameter	TMP422AIDCNTG4 (Main)	TMP422AIDCNR (Substitute)	TMP422AIDCNT (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Sensor Type	Digital, Local/Remote	Digital, Local/Remote	Digital, Local/Remote
Sensing Temperature - Local	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Sensing Temperature - Remote	-64°C ~ 191°C	-64°C ~ 191°C	-64°C ~ 191°C
Output Type	SMBus	SMBus	SMBus
Voltage - Supply	2.7V ~ 5.5V	2.7V ~ 5.5V	2.7V ~ 5.5V
Resolution	11 b	12 b	11 b
Features	One-Shot, Output Switch, Programmable Limit, Shutdown Mode	One-Shot, Output Switch, Programmable Limit, Shutdown Mode	One-Shot, Output Switch, Programmable Limit, Shutdown Mode
Accuracy	±1.5°C (±2.5°C)	±1.5°C (±2.5°C)	±1.5°C (±2.5°C)
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	SOT-23-8	SOT-23-8	SOT-23-8
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Obsolete	Active	Obsolete
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	2 (1 Year)	2 (1 Year)	2 (1 Year)

Engineering Selection Recommendations

TMP422AIDCNR is the manufacturer-recommended substitute. This part maintains full electrical compatibility with the TMP422AIDCNTG4 while offering improved product status (Active vs. Obsolete). The TMP422AIDCNR features 12-bit resolution compared to the 11-bit resolution of the main part, providing enhanced measurement precision. Both parts are ROHS3 compliant and carry identical MSL ratings. The TMP422AIDCNR is available in Cut Tape and Digi-Reel packaging formats with significantly higher inventory availability (39,382 units).

TMP422AIDCNT provides an alternative substitute with identical 11-bit resolution and electrical specifications to the TMP422AIDCNTG4. This part is supplied in Tape & Reel format and maintains obsolete product status. Selection of this substitute is appropriate when 11-bit resolution is a specific design requirement and packaging format compatibility is necessary.

Both substitutes maintain full SMBus protocol compatibility, identical temperature sensing ranges, supply voltage specifications, and feature sets. All three parts are surface-mount components in SOT-23-8 packages with equivalent thermal and electrical performance characteristics within their specified operating ranges.

Frequently Asked Questions (FAQ)

Q: Can TMP422AIDCNR replace TMP422AIDCNTG4 in existing designs?

A: Yes. The TMP422AIDCNR is electrically and mechanically compatible with the TMP422AIDCNTG4. Both parts share identical SMBus interface, temperature ranges, supply voltage specifications, and SOT-23-8 package dimensions. The primary difference is 12-bit versus 11-bit resolution. Designs requiring exactly 11-bit resolution should evaluate firmware or software compatibility with the higher resolution output.

Q: What is the difference between TMP422AIDCNR and TMP422AIDCNT?

A: Both parts are functionally equivalent to the TMP422AIDCNTG4 in electrical performance. The TMP422AIDCNR offers 12-bit resolution and Active product status with higher inventory availability. The TMP422AIDCNT maintains 11-bit resolution matching the original part but retains Obsolete status. Packaging differs: TMP422AIDCNR is available in Cut Tape and Digi-Reel formats, while TMP422AIDCNT is supplied in Tape & Reel format.

Q: Are there any compatibility concerns with the 12-bit resolution upgrade in TMP422AIDCNR?

A: The TMP422AIDCNR provides higher resolution output data. Systems designed for 11-bit data must accommodate the additional resolution bits. SMBus protocol compatibility remains unchanged. Firmware or software modifications may be required to process the extended resolution data, depending on system architecture.

Q: Do all three parts meet the same compliance standards?

A: Yes. TMP422AIDCNTG4, TMP422AIDCNR, and TMP422AIDCNT are all ROHS3 compliant with identical MSL ratings of 2 (1 Year). All parts carry REACH Unaffected status and EAR99 ECCN classification.

Q: Which substitute should be selected for new designs?

A: TMP422AIDCNR is recommended for new designs due to Active product status, higher resolution capability, and superior inventory availability. This part ensures long-term supply chain stability and design flexibility.

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