NCT75DR2G Equivalent & Substitute Parts

Part Overview

The NCT75DR2G is a digital temperature sensor manufactured by onsemi, designed for local temperature measurement across the -55°C to 125°C range. This 8-SOIC surface mount device communicates via I2C/SMBus interface and operates from 3V to 5.5V supply voltage. The part is currently in active production status with 25,522 units in stock.

Substitute parts are identified when equivalent electrical and mechanical specifications are required due to component availability, supply chain constraints, or design flexibility within the allowed parameter ranges.

Substiute Parts

NCT75DR2G

onsemiIn Stock: 25587NCT75DR2G Datasheet

Current PartRFQ

AT30TS74-SS8M-B

Microchip TechnologyIn Stock: 1400AT30TS74-SS8M-B Datasheet

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AT30TS74-SS8M-T

Microchip TechnologyIn Stock: 1237AT30TS74-SS8M-T Datasheet

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AT30TS750A-SS8M-B

Microchip TechnologyIn Stock: 1678AT30TS750A-SS8M-B Datasheet

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AT30TS75A-SS8M-T

Microchip TechnologyIn Stock: 9479AT30TS75A-SS8M-T Datasheet

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AT30TSE752A-SS8M-B

Microchip TechnologyIn Stock: 1547AT30TSE752A-SS8M-B Datasheet

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AT30TSE752A-SS8M-T

Microchip TechnologyIn Stock: 17655AT30TSE752A-SS8M-T Datasheet

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AT30TSE754A-SS8M-B

Microchip TechnologyIn Stock: 1323AT30TSE754A-SS8M-B Datasheet

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AT30TSE758A-SS8M-B

Microchip TechnologyIn Stock: 1000475AT30TSE758A-SS8M-B Datasheet

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MCP9803T-M/SN

Microchip TechnologyIn Stock: 2451MCP9803T-M/SN Datasheet

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TMP75BQDQ1

Texas InstrumentsIn Stock: 32907TMP75BQDQ1 Datasheet

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TMP75BQDRQ1

Texas InstrumentsIn Stock: 7258TMP75BQDRQ1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the NCT75DR2G are qualified based on the following criteria:

Electrical Compatibility:

• Operating temperature range: -55°C to 125°C minimum
• Output interface: I2C/SMBus protocol support
• Supply voltage range: Must accommodate 3V to 5.5V operation
• Resolution: 11-bit or 12-bit acceptable
• Accuracy: ±1°C to ±3°C within specified test conditions

Mechanical Compatibility:

• Package type: 8-SOIC form factor only
• Mounting: Surface mount technology
• Pin count and pitch: Identical to NCT75DR2G

Regulatory & Quality:

• RoHS3 compliance required
• Active or available product status preferred
• Moisture sensitivity level acceptable up to MSL 3

The substitute parts listed below meet all electrical and mechanical requirements while maintaining functional equivalence for temperature sensing applications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Highest Compatibility):

AT30TSE752A-SS8M-T and AT30TSE758A-SS8M-B are the preferred alternatives. Both are manufactured by Microchip Technology, maintain active product status, and deliver ±1°C accuracy matching the NCT75DR2G specification. The AT30TSE758A-SS8M-B offers the highest inventory availability at 1,000,399 units. Both parts support the full -55°C to 125°C temperature range and I2C/SMBus communication protocol.

Secondary Substitutes (Acceptable with Design Review):

AT30TS75A-SS8M-T and AT30TS750A-SS8M-B provide ±1°C accuracy and full temperature range coverage. These parts are active and available in adequate quantities. The AT30TS75A-SS8M-T variant has 9,386 units in stock.

Limited Substitutes (Reduced Accuracy):

AT30TS74-SS8M-B and AT30TS74-SS8M-T deliver ±2°C accuracy within the -20°C to 100°C test range, which is lower precision than the NCT75DR2G. These parts are suitable only when reduced accuracy is acceptable for the application.

Not Recommended:

TMP75BQDQ1 is obsolete and operates only to -40°C minimum, which does not meet the full -55°C lower temperature requirement of the NCT75DR2G. This part should not be selected for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use an 11-bit resolution substitute instead of the 12-bit NCT75DR2G?

A: Yes. The 11-bit resolution substitutes provide sufficient precision for most temperature sensing applications. The difference between 11-bit and 12-bit resolution is 0.0625°C per LSB versus 0.03125°C per LSB. Verify that your application firmware can accommodate the reduced resolution step size.

Q: What is the difference between the AT30TSE752A and AT30TS75A part numbers?

A: Both deliver identical electrical performance with ±1°C accuracy and 11-bit resolution across -55°C to 125°C. The AT30TSE752A includes EEPROM functionality and additional programmable features. Select based on specific application requirements for non-volatile memory storage.

Q: Are the Microchip AT30TS and AT30TSE series pin-compatible with the NCT75DR2G?

A: Yes. All listed Microchip substitutes use the 8-SOIC package with identical pinout and I2C/SMBus protocol support. Direct PCB substitution is possible without layout modifications.

Q: Why is the TMP75BQDQ1 listed if it is obsolete?

A: The TMP75BQDQ1 is included for reference only. It does not meet the -55°C minimum temperature requirement and is no longer in active production. New designs should not incorporate this part.

Q: What is the impact of lower supply voltage range on substitutes?

A: Microchip substitutes operate from 1.7V minimum, which is lower than the NCT75DR2G specification of 3V minimum. This provides additional design flexibility for lower-voltage applications. Verify that your power supply design can accommodate the substitute's voltage range.

Q: Can I mix NCT75DR2G and substitute parts in the same production run?

A: Yes, provided your firmware and application design accommodate the parameter variations listed in the comparison table. Document the approved substitute list in your design specifications and bill of materials.