DS1621 Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS1621 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. This component operates via I2C interface with 9-bit resolution and is housed in an 8-DIP package for through-hole mounting applications.

The DS1621 is classified as obsolete, making identification of compatible substitute components essential for ongoing system support, maintenance, and new design implementations where legacy compatibility is required.

Substiute Parts

DS1621

Analog Devices Inc./Maxim IntegratedIn Stock: 2081DS1621 Datasheet

Current PartRFQ

DS1621+

Analog Devices Inc./Maxim IntegratedIn Stock: 3802DS1621+ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the DS1621 is determined by strict equivalence across the following critical parameters:

• Sensor Type: Digital, Local
• Temperature Sensing Range: -55°C ~ 125°C
• Output Interface: I2C
• Supply Voltage Range: 2.7V ~ 5.5V
• Resolution: 9 bits
• Accuracy Specification: ±0.5°C / ±2°C
• Package Configuration: 8-DIP (0.300", 7.62mm)
• Mounting Method: Through Hole

The DS1621+ meets all electrical and mechanical substitution criteria, maintaining identical functional specifications while offering improved product status and regulatory compliance.

Parameter Comparison

Engineering Selection Recommendations

The DS1621+ serves as the direct functional equivalent to the DS1621, with identical electrical and mechanical specifications. The primary distinction lies in product lifecycle status and regulatory compliance:

• The DS1621 is obsolete and no longer in active production
• The DS1621+ maintains active product status with current manufacturing support
• The DS1621+ achieves ROHS3 compliance, whereas the DS1621 is non-compliant
• Both components share identical I2C protocol implementation, temperature range, resolution, and package configuration

For applications requiring long-term component availability, regulatory compliance, or new system designs, the DS1621+ is the appropriate selection. Pin-for-pin compatibility and functional equivalence ensure direct substitution without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the DS1621+ directly replace the DS1621 in existing circuits?

A: Yes. The DS1621+ is pin-for-pin compatible with identical electrical specifications, I2C protocol implementation, and 8-DIP package configuration. No circuit modifications are required.

Q: What is the primary reason to substitute the DS1621?

A: The DS1621 is classified as obsolete. The DS1621+ provides equivalent functionality with active product status and current manufacturing availability.

Q: Are there differences in temperature measurement accuracy between these components?

A: No. Both the DS1621 and DS1621+ maintain identical accuracy specifications of ±0.5°C across 0°C to 70°C and ±2°C across the full -55°C to 125°C range.

Q: Does the DS1621+ require different firmware or software implementation?

A: No. The I2C interface protocol, command set, and register structure are identical. Existing firmware requires no modification.

Q: What is the significance of ROHS3 compliance on the DS1621+?

A: ROHS3 compliance indicates adherence to current environmental and hazardous substance restrictions. This is relevant for applications subject to regulatory requirements or procurement policies mandating RoHS-compliant components.

Q: Are the packaging and mounting specifications identical?

A: Yes. Both components use 8-DIP (0.300", 7.62mm) through-hole packages with identical pin assignments and mechanical dimensions.