DS1631U Temperature Sensor Equivalent & Substitute Parts

Part Overview

The DS1631U is a digital temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for local temperature measurement across the -55°C to 125°C range with 11-bit resolution and I2C output interface. The device operates on a 2.7V to 5.5V supply and features programmable resolution, output switching, and standby mode capabilities. The DS1631U is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

DS1631U

Analog Devices Inc./Maxim IntegratedIn Stock: 1349DS1631U Datasheet

Current PartRFQ

DS1631U+

Analog Devices Inc./Maxim IntegratedIn Stock: 1614DS1631U+ Datasheet

DirectRFQ

TCN75-3.3MUA

Microchip TechnologyIn Stock: 1281TCN75-3.3MUA Datasheet

MFR RecommendedRFQ

TCN75-3.3MUA713

Microchip TechnologyIn Stock: 1955TCN75-3.3MUA713 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1631U is determined by the following critical parameters: sensor type (digital, local), temperature sensing range (-55°C to 125°C), output interface (I2C), supply voltage compatibility (2.7V to 5.5V), package form factor (8-TSSOP/8-MSOP), and mounting type (surface mount). Resolution and accuracy variations are permitted within the substitute group provided all other parameters remain compatible.

The DS1631U+ serves as a direct form-fit-function replacement with identical electrical and mechanical specifications, differing only in product status (active versus obsolete) and RoHS compliance level. The TCN75-3.3MUA and TCN75-3.3MUA713 variants from Microchip Technology meet all core substitution criteria with the exception of resolution (8-bit versus 11-bit) and accuracy specification, representing functional alternatives suitable for applications where the reduced resolution and relaxed accuracy tolerance are acceptable.

Parameter Comparison

Engineering Selection Recommendations

The DS1631U+ is the primary substitute for the obsolete DS1631U, offering identical electrical performance and mechanical compatibility while providing active product status and ROHS3 compliance. This substitution requires no design modification and maintains full functional equivalence.

The TCN75-3.3MUA and TCN75-3.3MUA713 represent alternative substitutes from Microchip Technology with active product status and ROHS3 compliance. These devices are suitable for applications where 8-bit resolution and ±3°C accuracy are acceptable in place of the DS1631U's 11-bit resolution and ±0.5°C accuracy specification. Both variants share identical electrical and mechanical characteristics; selection between them is determined by packaging and supply chain requirements (tube versus cut tape/digi-reel).

All substitute options maintain compatibility with the original -55°C to 125°C operating range, I2C interface, 2.7V to 5.5V supply voltage, and 8-TSSOP/8-MSOP package form factor.

Frequently Asked Questions (FAQ)

Q: Can the DS1631U+ be used as a direct replacement for the DS1631U?

A: Yes. The DS1631U+ is a direct form-fit-function replacement with identical sensor type, temperature range, output interface, supply voltage, resolution, accuracy, and package specifications. The primary differences are product status (active versus obsolete) and RoHS compliance level.

Q: What are the key differences between the DS1631U and the TCN75-3.3MUA?

A: Both devices share the same sensor type, temperature range, output interface, supply voltage, and package form factor. The TCN75-3.3MUA differs in resolution (8-bit versus 11-bit) and accuracy (±3°C versus ±0.5°C). The TCN75-3.3MUA is suitable for applications where reduced resolution and relaxed accuracy tolerance are acceptable.

Q: Are the TCN75-3.3MUA and TCN75-3.3MUA713 electrically identical?

A: Yes. Both variants are electrically identical. The difference is packaging format: TCN75-3.3MUA is supplied in tube packaging, while TCN75-3.3MUA713 is supplied in cut tape and digi-reel format.

Q: Do all substitute parts maintain the same package footprint?

A: Yes. All substitute parts use the 8-TSSOP or 8-MSOP package with 0.118" width (3.00mm), ensuring identical PCB footprint compatibility.

Q: What is the impact of moving from 11-bit to 8-bit resolution?

A: The resolution reduction from 11-bit to 8-bit decreases temperature measurement granularity. The 11-bit DS1631U provides approximately 0.0625°C per LSB, while the 8-bit TCN75 variants provide approximately 0.5°C per LSB. This affects measurement precision but not the overall temperature sensing capability within the -55°C to 125°C range.

Q: Are all substitute parts RoHS compliant?

A: The DS1631U is RoHS non-compliant. The DS1631U+, TCN75-3.3MUA, and TCN75-3.3MUA713 are all ROHS3 compliant, meeting current environmental and regulatory requirements.