DS18B20 Equivalent & Substitute Parts

Part Overview

The DS18B20 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. The device features 1-Wire® output protocol, 12-bit resolution, and operates on a 3V to 5.5V supply voltage. The DS18B20 is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production requirements.

Substiute Parts

DS18B20

Analog Devices Inc./Maxim IntegratedIn Stock: 18718DS18B20 Datasheet

Current PartRFQ

DS18B20+

Analog Devices Inc./Maxim IntegratedIn Stock: 55280DS18B20+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DS18B20 is determined by strict equivalence across the following critical parameters:

• Sensor type classification (Digital, Local)
• Temperature sensing range (-55°C ~ 125°C)
• Output protocol (1-Wire®)
• Supply voltage range (3V ~ 5.5V)
• Resolution (12 bits)
• Accuracy specifications (±0.5°C / ±2°C)
• Package and mounting configuration (TO-92-3, Through Hole)
• Feature set (Output Switch, Programmable Limit, Programmable Resolution)

Parts meeting all these criteria are classified as direct equivalents and may be substituted without circuit modification or firmware changes.

Parameter Comparison

Engineering Selection Recommendations

The DS18B20+ is a direct functional equivalent to the DS18B20 with identical electrical and mechanical specifications. The primary distinction is product status: the DS18B20 is obsolete, while the DS18B20+ is active and available in production quantities. The DS18B20+ additionally meets ROHS3 compliance requirements, whereas the original DS18B20 is RoHS non-compliant. For new designs and production applications, the DS18B20+ is the appropriate selection based on availability and regulatory compliance status.

Frequently Asked Questions (FAQ)

Q: Can the DS18B20+ be used as a direct replacement for the DS18B20?

A: Yes. The DS18B20+ maintains identical electrical characteristics, output protocol, temperature range, resolution, accuracy, and package configuration. No circuit modifications or firmware changes are required.

Q: What is the primary reason to transition from DS18B20 to DS18B20+?

A: The DS18B20 is classified as obsolete. The DS18B20+ is the active equivalent part, ensuring continued availability for production and new designs. Additionally, the DS18B20+ meets ROHS3 compliance standards.

Q: Are there any differences in pin configuration or package dimensions?

A: No. Both parts use the TO-92-3 package with identical Through Hole mounting configuration and pin assignments.

Q: Do the accuracy specifications differ between the two parts?

A: No. Both parts maintain ±0.5°C accuracy across the -10°C to 85°C test range and ±2°C accuracy across the full -55°C to 125°C operating range.

Q: Is the 1-Wire® protocol implementation identical?

A: Yes. Both parts implement the same 1-Wire® output protocol with identical feature sets including Output Switch, Programmable Limit, and Programmable Resolution functionality.