DS18B20/T&R Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS18B20/T&R is a digital temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for local temperature measurement across the range of -55°C to 125°C with 12-bit resolution. This component utilizes 1-Wire® protocol for communication and operates on a 3V to 5.5V supply voltage. The part is currently classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and procurement planning.

Substiute Parts

DS18B20/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 1240DS18B20/T&R Datasheet

Current PartRFQ

DS18B20+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 4277DS18B20+T&R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS18B20/T&R is determined by strict equivalence across the following critical parameters:

• Sensor Type & Protocol: Digital, Local sensor with 1-Wire® output interface
• Temperature Range: -55°C to 125°C sensing capability
• Resolution: 12-bit digital output
• Supply Voltage: 3V to 5.5V operating range
• Package & Mounting: TO-92-3 through-hole configuration
• Electrical Characteristics: Matching accuracy specifications (±0.5°C / ±2°C)

The DS18B20+T&R meets all these criteria as a direct functional equivalent, with the primary distinction being packaging format (Cut Tape versus the original specification) and active product status.

Parameter Comparison

Engineering Selection Recommendations

The DS18B20+T&R is the appropriate substitute for the obsolete DS18B20/T&R. Both components share identical electrical specifications, temperature operating range, resolution, and communication protocol. The substitute part maintains active product status with ROHS3 compliance, providing improved regulatory alignment compared to the non-compliant original part. The packaging format difference (Cut Tape versus Tape & Reel) does not affect functional compatibility; selection between these formats depends on procurement volume and assembly process requirements. The substitute part is available in higher inventory quantities, supporting supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Are DS18B20/T&R and DS18B20+T&R electrically interchangeable?

A: Yes. Both components are manufactured by the same supplier, share identical sensor type, temperature range, resolution, supply voltage, and accuracy specifications. They are direct functional equivalents at the electrical level.

Q: What is the difference between T&R and CT packaging?

A: T&R denotes Tape & Reel packaging, while CT denotes Cut Tape packaging. Both formats contain the same TO-92-3 component; the difference is in the carrier format for automated assembly. T&R is typically used for high-volume production lines, while CT is suitable for lower-volume or manual assembly processes.

Q: Why is the original part marked as obsolete?

A: Product obsolescence is determined by the manufacturer based on market demand and production decisions. The DS18B20+T&R remains in active production and provides equivalent functionality, making it the recommended alternative for new designs and ongoing procurement.

Q: Does the RoHS3 compliance of the substitute part affect compatibility?

A: No. RoHS3 compliance is a regulatory and environmental certification that does not alter the electrical or functional characteristics of the component. The substitute part maintains full compatibility with existing designs while meeting current regulatory requirements.

Q: Can I use DS18B20+T&R in existing PCB designs specified for DS18B20/T&R?

A: Yes. The TO-92-3 package dimensions and pinout are identical. No PCB modifications are required. The substitute part is a direct replacement for through-hole mounting applications.

Q: What is the 1-Wire® protocol?

A: 1-Wire® is a serial communication protocol that allows multiple devices to communicate over a single data line plus ground. The DS18B20 series uses this protocol for temperature data transmission, enabling simplified circuit design with minimal wiring requirements.