DS1624S Temperature Sensor - Equivalent & Substitute Parts

Part Overview

The DS1624S 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 a 2.7V to 5.5V supply and features one-shot and standby modes for flexible power management.

The DS1624S is classified as obsolete. Identifying functionally equivalent substitute parts is necessary to support ongoing system maintenance, design updates, and procurement continuity where original components are no longer readily available or where active product variants offer improved compliance status.

Substiute Parts

DS1624S

Analog Devices Inc./Maxim IntegratedIn Stock: 1833DS1624S Datasheet

Current PartRFQ

DS1624S+

Analog Devices Inc./Maxim IntegratedIn Stock: 2240DS1624S+ 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

Substitute parts for the DS1624S are identified based on the following critical parameters that determine functional compatibility:

Primary Compatibility Criteria:

• Output interface type (I2C/2-Wire Serial)
• Operating temperature range overlap with application requirements
• Supply voltage compatibility
• Surface mount package format
• Digital sensor topology

Substitution Categories:

Category 1: Direct Manufacturer Variant DS1624S+ represents the active production equivalent from the same manufacturer. This part maintains identical electrical specifications, package format, and I2C interface while offering improved RoHS3 compliance status.

Category 2: Cross-Manufacturer Alternatives MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB are Microchip Technology temperature monitoring sensors with I2C output capability. These parts operate within overlapping temperature ranges (-40°C ~ 125°C) and support 2-Wire Serial/I2C communication. Supply voltage range differs (1.7V ~ 3.6V), requiring circuit evaluation for applications operating at the upper end of the DS1624S supply specification.

Parameter Comparison

Engineering Selection Recommendations

DS1624S+ (Recommended Primary Substitute) The DS1624S+ is the direct active equivalent from Analog Devices Inc./Maxim Integrated. It maintains identical electrical specifications, package format, and pinout compatibility with the obsolete DS1624S while achieving ROHS3 compliance. This part requires no circuit modifications and provides the highest compatibility for direct replacement applications. Selection is appropriate for all applications currently using DS1624S.

MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB (Cross-Manufacturer Alternatives) These Microchip Technology parts provide I2C communication capability and operate within the critical temperature range of -40°C to 125°C, covering the majority of the DS1624S operating window. All three variants are active products with ROHS3 compliance. Critical design considerations include:

• Supply voltage range (1.7V ~ 3.6V) is narrower than DS1624S (2.7V ~ 5.5V). Applications requiring operation above 3.6V require circuit redesign.
• Package format differs (8-TDFN vs. 8-SOIC), necessitating PCB layout modifications.
• Accuracy specification (±3°C maximum) is lower than DS1624S (±0.5°C in the 0°C ~ 70°C range).
• Lower operating temperature limit (-40°C vs. -55°C) excludes applications requiring sub-40°C measurement.

Selection of MCP9844T variants is appropriate only when circuit voltage constraints permit operation within the 1.7V ~ 3.6V range and when the ±3°C accuracy specification meets application requirements.

Frequently Asked Questions (FAQ)

Q: Can DS1624S+ be used as a direct replacement for DS1624S? A: Yes. DS1624S+ is the active production equivalent from the same manufacturer with identical electrical specifications, package format, and I2C interface. No circuit modifications are required.

Q: What are the key differences between DS1624S and MCP9844T variants? A: The primary differences are supply voltage range (DS1624S: 2.7V ~ 5.5V; MCP9844T: 1.7V ~ 3.6V), accuracy specification (DS1624S: ±0.5°C at 0°C ~ 70°C; MCP9844T: ±3°C maximum), package format (8-SOIC vs. 8-TDFN), and minimum operating temperature (DS1624S: -55°C; MCP9844T: -40°C).

Q: Are MCP9844T variants suitable for applications requiring -55°C operation? A: No. MCP9844T variants operate down to -40°C only. Applications requiring -55°C measurement capability must use DS1624S or DS1624S+.

Q: Do MCP9844T variants require circuit modifications for use in existing DS1624S designs? A: Yes. The narrower supply voltage range (1.7V ~ 3.6V) and different package format (8-TDFN vs. 8-SOIC) require circuit evaluation and PCB layout modifications.

Q: What is the compliance status of available substitutes? A: DS1624S+ and all MCP9844T variants are ROHS3 compliant. The original DS1624S is RoHS non-compliant. All parts are REACH unaffected and classified as EAR99.

Q: Which substitute part should be selected for new designs? A: DS1624S+ is recommended for applications requiring the full -55°C ~ 125°C temperature range and 2.7V ~ 5.5V supply voltage compatibility. MCP9844T variants are suitable only when application requirements align with their narrower voltage and temperature specifications.