DS18S20/T&R Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS18S20/T&R is a digital temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for local temperature measurement across a range of -55°C to 125°C. This component operates on a 1-Wire® interface and provides 9-bit resolution with programmable limit and standby mode features. The part is currently classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design requirements and component procurement.

Substiute Parts

DS18S20/T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 660DS18S20/T&R Datasheet

Current PartRFQ

DS18S20+T&R

Analog Devices Inc./Maxim IntegratedIn Stock: 4231DS18S20+T&R Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS18S20/T&R is determined by strict equivalence across the following critical parameters:

• Sensor type classification (Digital, Local)
• Temperature sensing range (-55°C ~ 125°C)
• Communication interface (1-Wire®)
• Supply voltage range (3V ~ 5.5V)
• Resolution (9 bits)
• Accuracy specifications (±0.5°C / ±2°C)
• Package and mounting configuration (TO-92-3, Through Hole)

The DS18S20+T&R meets all substitution criteria as a direct equivalent. The primary distinction between the main part and its substitute is product status and packaging format, not functional or electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The DS18S20+T&R is the direct functional equivalent of the DS18S20/T&R. Selection of the substitute part is justified on the following grounds:

• Identical electrical and mechanical specifications across all critical parameters
• Active product status ensures ongoing availability and supply chain continuity
• ROHS3 compliance of the substitute part aligns with current regulatory requirements, whereas the main part is non-compliant
• Both parts maintain REACH Unaffected and EAR99 ECCN classifications
• Cut Tape packaging format of the substitute accommodates standard component handling and assembly processes

No functional or performance degradation occurs when transitioning from the obsolete DS18S20/T&R to the DS18S20+T&R.

Frequently Asked Questions (FAQ)

Q: Are the DS18S20/T&R and DS18S20+T&R electrically identical?

A: Yes. Both parts share identical sensor type, temperature range, output interface, supply voltage, resolution, and accuracy specifications. They are functionally equivalent for all circuit applications.

Q: What is the difference between the two part numbers?

A: The primary differences are product status (obsolete vs. active), packaging format (Tape & Reel vs. Cut Tape), and RoHS compliance status (non-compliant vs. ROHS3 compliant). The electrical and mechanical specifications are identical.

Q: Can I use DS18S20+T&R as a direct replacement in existing designs?

A: Yes. The DS18S20+T&R is a direct substitute. No circuit modifications, firmware changes, or design alterations are required. Pin configuration, package type, and functional behavior are identical.

Q: Does the packaging format affect circuit performance?

A: No. Packaging format (Tape & Reel vs. Cut Tape) affects only component handling and assembly logistics, not electrical performance or functionality.

Q: Why is RoHS compliance relevant for this substitution?

A: RoHS compliance reflects current manufacturing and environmental standards. The ROHS3-compliant DS18S20+T&R aligns with modern procurement and regulatory requirements, whereas the non-compliant DS18S20/T&R does not.

Q: Is the 1-Wire® interface identical between both parts?

A: Yes. Both parts implement the same 1-Wire® protocol with identical communication specifications, timing, and command structure.