DS1721U/T&R Temperature Sensor Equivalent & Substitute Parts

Part Overview

The DS1721U/T&R 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. The device operates on a 2.7V to 5.5V supply and features programmable limits, one-shot capability, and standby mode functionality. This part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring similar thermal monitoring capabilities.

Substiute Parts

DS1721U/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 974DS1721U/T&R Datasheet

Current PartRFQ

DS1721U+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 6216DS1721U+T&R 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 for the DS1721U/T&R is determined by the following critical parameters: I2C interface compatibility, operating temperature range (-55°C to 125°C), surface mount 8-pin MSOP/TSSOP package, and supply voltage range (2.7V to 5.5V). The substitute parts identified maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs.

The substitution logic is based on:

• Identical I2C communication protocol
• Matching temperature operating range
• Compatible package footprint and pinout
• Overlapping supply voltage specifications
• Surface mount technology compatibility

Parameter Comparison

Engineering Selection Recommendations

DS1721U+T&R is the direct equivalent substitute, maintaining identical electrical specifications (11-bit resolution, ±1°C accuracy) while offering active product status and ROHS3 compliance. This part is recommended as the primary replacement for the obsolete DS1721U/T&R, with the only difference being packaging format (Cut Tape & Digi-Reel® versus Tape & Reel).

TCN75-3.3MUA and TCN75-3.3MUA713 are manufacturer-recommended alternatives from Microchip Technology. Both parts maintain full temperature range compatibility (-55°C to 125°C), I2C interface, and identical package specifications. The trade-off is reduced resolution (8 bits versus 11 bits) and lower accuracy specification (±3°C versus ±1°C). These substitutes are suitable for applications where the reduced resolution and accuracy are acceptable within system requirements. Both variants are ROHS3 compliant and carry active product status.

Selection between TCN75-3.3MUA (Tube packaging) and TCN75-3.3MUA713 (Cut Tape & Digi-Reel®) depends on procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can DS1721U+T&R directly replace DS1721U/T&R without circuit modifications?

A: Yes. DS1721U+T&R maintains identical electrical specifications, I2C pinout, and package footprint. The only difference is packaging format. No circuit modifications are required.

Q: What are the key differences between DS1721U/T&R and TCN75 series substitutes?

A: The primary differences are resolution (11 bits versus 8 bits) and accuracy (±1°C versus ±3°C). Both maintain the same temperature operating range, I2C interface, supply voltage, and package specifications. Applications requiring higher resolution or tighter accuracy should use DS1721U+T&R.

Q: Are the TCN75-3.3MUA and TCN75-3.3MUA713 interchangeable?

A: Yes, electrically and functionally. The difference is packaging format: TCN75-3.3MUA is supplied in Tube packaging, while TCN75-3.3MUA713 is supplied in Cut Tape & Digi-Reel®. Select based on assembly line requirements.

Q: Do all substitute parts meet RoHS compliance requirements?

A: DS1721U/T&R is RoHS non-compliant. DS1721U+T&R, TCN75-3.3MUA, and TCN75-3.3MUA713 are all ROHS3 compliant. If RoHS compliance is a system requirement, use any of the three active substitutes.

Q: What is the impact of using 8-bit resolution (TCN75) instead of 11-bit resolution (DS1721)?

A: 8-bit resolution provides 1°C temperature step increments across the full range, while 11-bit resolution provides approximately 0.125°C increments. Select based on application thermal monitoring precision requirements.

Q: Are all substitute parts available in the same package footprint?

A: Yes. All parts use 8-TSSOP or 8-MSOP packages with 0.118" width and 3.00mm body width, ensuring identical PCB footprint compatibility.