DS1621V Equivalent & Substitute Parts

Part Overview

The DS1621V 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 9-bit resolution and I2C output. The device operates on a 2.7V to 5.5V supply and features one-shot capability, output switch functionality, and standby mode operation in an 8-SOIC surface mount package.

The DS1621V is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity and ensure component availability for new production runs and system upgrades.

Substiute Parts

DS1621V

Analog Devices Inc./Maxim IntegratedIn Stock: 1419DS1621V Datasheet

Current PartRFQ

DS1621V+

Analog Devices Inc./Maxim IntegratedIn Stock: 1739DS1621V+ Datasheet

DirectRFQ

ADT75ARZ

Analog Devices Inc.In Stock: 34994ADT75ARZ Datasheet

MFR RecommendedRFQ

ADT75ARZ-REEL

Analog Devices Inc.In Stock: 17822ADT75ARZ-REEL Datasheet

MFR RecommendedRFQ

ADT75ARZ-REEL7

Analog Devices Inc.In Stock: 1968ADT75ARZ-REEL7 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DS1621V is determined by the following critical parameters:

• Sensor type (Digital, Local)
• Temperature sensing range (-55°C ~ 125°C)
• Output interface (I2C or I2C/SMBus compatible)
• Supply voltage compatibility (2.7V ~ 5.5V)
• Package type (8-SOIC surface mount)
• Mounting compatibility

Substitute parts are grouped into two categories:

Direct Equivalent: DS1621V+ maintains identical electrical specifications and 9-bit resolution, differing only in product status (Active) and RoHS compliance (ROHS3 Compliant).

Functional Equivalents: ADT75ARZ, ADT75ARZ-REEL, and ADT75ARZ-REEL7 provide the same temperature sensing range and package footprint with enhanced specifications including 12-bit resolution, I2C/SMBus compatibility, and additional features (Programmable Limit, Shutdown Mode). These parts are pin-compatible and functionally superior while maintaining backward compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): DS1621V+ is the primary substitute, offering identical electrical performance and specifications while maintaining Active product status and ROHS3 compliance. This part requires no design modifications and provides the most straightforward migration path from the obsolete DS1621V.

For Enhanced Performance: ADT75ARZ, ADT75ARZ-REEL, and ADT75ARZ-REEL7 are functionally equivalent alternatives that provide superior specifications including 12-bit resolution (versus 9-bit), I2C/SMBus compatibility, and additional control features. These parts are pin-compatible with the DS1621V and maintain the same temperature sensing range and supply voltage requirements. All three ADT75 variants are Active products with ROHS3 compliance.

Packaging Considerations: The ADT75 series uses a narrower 8-SOIC package (0.154" width) compared to the DS1621V (0.209" width). While both are 8-SOIC footprints, PCB layout verification is required to confirm mechanical compatibility with existing designs.

Compliance Requirements: All substitute parts meet REACH and ECCN EAR99 requirements. For applications requiring RoHS compliance, DS1621V+ and all ADT75 variants are ROHS3 compliant, whereas the original DS1621V is non-compliant.

Frequently Asked Questions (FAQ)

Q: Can DS1621V+ be used as a direct drop-in replacement for DS1621V?

A: Yes. DS1621V+ maintains identical electrical specifications, resolution (9-bit), I2C output, temperature range (-55°C ~ 125°C), and supply voltage (2.7V ~ 5.5V). The primary differences are product status (Active versus Obsolete) and RoHS compliance (ROHS3 Compliant). No design modifications are required.

Q: What are the key differences between DS1621V+ and ADT75ARZ?

A: Both parts operate within the same temperature range and supply voltage. Key differences include: ADT75ARZ offers 12-bit resolution versus 9-bit, supports I2C/SMBus versus I2C only, provides ±2°C accuracy versus ±0.5°C, and includes additional features such as Programmable Limit and Shutdown Mode. The ADT75ARZ uses a narrower 8-SOIC package (0.154" width) versus DS1621V (0.209" width).

Q: Are ADT75ARZ, ADT75ARZ-REEL, and ADT75ARZ-REEL7 electrically identical?

A: Yes. These three part numbers are electrically identical. The differences are packaging format: ADT75ARZ is supplied in Tube packaging, while ADT75ARZ-REEL and ADT75ARZ-REEL7 are supplied in Cut Tape (CT) & Digi-Reel® format. Selection depends on procurement and assembly requirements.

Q: Will the ADT75 series work with existing DS1621V firmware or software?

A: The ADT75 series maintains I2C protocol compatibility and the same register structure for basic temperature reading functions. However, the enhanced 12-bit resolution and additional features (Programmable Limit, Shutdown Mode) require firmware updates to fully utilize these capabilities. Basic temperature measurement functionality is backward compatible.

Q: What is the impact of the different 8-SOIC package widths?

A: DS1621V uses 0.209" width while ADT75 uses 0.154" width. Both are standard 8-SOIC packages with identical pin pitch and height. PCB footprint compatibility depends on the original design layout. Verify that the narrower ADT75 package does not create mechanical clearance issues with adjacent components or solder mask patterns.

Q: Are all substitute parts available in the same quantities?

A: Inventory levels vary. DS1621V+ has 1653 Pcs in stock, ADT75ARZ has 34920 Pcs, ADT75ARZ-REEL has 17800 Pcs, and ADT75ARZ-REEL7 has 1888 Pcs. Availability should be confirmed with your supplier for production requirements.