DS1624 Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS1624 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 interface. The device operates on supply voltages between 2.7V and 5.5V and features one-shot and standby modes for flexible power management.

The DS1624 is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications requiring digital temperature sensing with I2C communication.

Substiute Parts

DS1624

Analog Devices Inc./Maxim IntegratedIn Stock: 759DS1624 Datasheet

Current PartRFQ

DS1624+

Analog Devices Inc./Maxim IntegratedIn Stock: 1487DS1624+ Datasheet

DirectRFQ

MCP9844T-BE/MNY

Microchip TechnologyIn Stock: 6644MCP9844T-BE/MNY Datasheet

MFR RecommendedRFQ

MCP9844T-BE/MNYAA

Microchip TechnologyIn Stock: 1241MCP9844T-BE/MNYAA Datasheet

MFR RecommendedRFQ

MCP9844T-BE/MNYAB

Microchip TechnologyIn Stock: 6664MCP9844T-BE/MNYAB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS1624 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Output interface type (I2C/2-Wire Serial)
• Operating temperature range overlap with application requirements
• Supply voltage compatibility
• Resolution and accuracy specifications
• Mounting and package form factor

Substitution Categories:

Direct Manufacturer Equivalent (DS1624+): Maintains identical electrical specifications, temperature range, resolution, and I2C interface. The primary distinction is product status (active vs. obsolete) and RoHS compliance improvement (ROHS3 compliant vs. non-compliant). Packaging format changes from unspecified to tube configuration.

Cross-Manufacturer Alternatives (MCP9844 Series): The Microchip MCP9844T-BE variants provide I2C/2-Wire Serial output with overlapping temperature sensing capability (-40°C ~ 125°C). These devices operate at lower supply voltages (1.7V ~ 3.6V) and use surface-mount packaging (8-TDFN) rather than through-hole DIP. Resolution and accuracy specifications differ, requiring application-level validation.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Specifications): Select DS1624+ when design specifications require through-hole mounting, 11-bit resolution, ±0.5°C accuracy in the 0°C to 70°C range, and the full -55°C to 125°C operating temperature span. DS1624+ maintains electrical and functional equivalence to DS1624 while offering active product status and ROHS3 compliance.

For Cross-Manufacturer Substitution (MCP9844 Series): The MCP9844T-BE variants are suitable when:

• Application temperature requirements fall within -40°C to 125°C (does not extend to -55°C)
• Supply voltage can be reduced to 1.7V to 3.6V range
• Surface-mount packaging is acceptable or preferred
• Accuracy tolerance of ±3°C maximum is acceptable
• I2C/2-Wire Serial communication protocol compatibility is confirmed

All substitute options maintain ROHS3 compliance and REACH unaffected status. Selection should be validated against specific application requirements for temperature range, accuracy, and form factor constraints.

Frequently Asked Questions (FAQ)

Q: Can DS1624+ be used as a direct drop-in replacement for DS1624?

A: Yes. DS1624+ maintains identical electrical specifications, temperature range (-55°C to 125°C), resolution (11 bits), I2C output, supply voltage (2.7V to 5.5V), and through-hole 8-DIP packaging. The primary differences are product status (active vs. obsolete) and improved RoHS compliance.

Q: What are the key limitations when substituting with MCP9844T-BE variants?

A: The MCP9844T-BE series has three primary constraints: (1) minimum operating temperature is -40°C rather than -55°C, (2) supply voltage range is 1.7V to 3.6V, which is narrower and lower than DS1624's 2.7V to 5.5V, and (3) accuracy is ±3°C maximum compared to DS1624's ±0.5°C in the 0°C to 70°C range. Additionally, MCP9844 uses surface-mount 8-TDFN packaging instead of through-hole DIP.

Q: Are all MCP9844T-BE variants (MNY, MNYAA, MNYAB) electrically equivalent?

A: Yes. MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB share identical electrical specifications and temperature sensing characteristics. Differences are limited to packaging format (Cut Tape & Digi-Reel, Tape & Reel, and unspecified respectively) and inventory availability.

Q: What compliance certifications apply to substitute parts?

A: DS1624+ and all MCP9844T-BE variants are ROHS3 compliant and REACH unaffected. Both DS1624 (original) and all substitutes carry EAR99 ECCN classification and HTSUS code 8542.39.0001.

Q: If my application requires -55°C operation, which substitutes are viable?

A: Only DS1624+ maintains the -55°C lower temperature limit. MCP9844T-BE variants operate only to -40°C minimum and are not suitable for applications requiring -55°C capability.

Q: What packaging considerations apply when switching from DS1624 to MCP9844?

A: DS1624 and DS1624+ use through-hole 8-DIP mounting (0.300", 7.62mm), while MCP9844T-BE variants use surface-mount 8-TDFN (2x3) packaging. PCB layout, footprint, and assembly process changes are required for cross-manufacturer substitution.