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DS75U Temperature Sensor Equivalent & Substitute Parts
Part Overview
The DS75U is a digital local temperature sensor manufactured by Analog Devices Inc./Maxim Integrated, designed for applications requiring -55°C to 125°C temperature monitoring with 11-bit resolution and I2C output. The device operates on 2.7V to 5.5V supply voltage and is packaged in 8-uMAX/uSOP surface mount configuration.
The DS75U is classified as obsolete. Equivalent and substitute parts are necessary to maintain design continuity, ensure supply chain availability, and meet current RoHS compliance requirements for new production runs.
Substiute Parts
Key Parameters
| Parameter | DS75U Specification |
|---|---|
| Sensor Type | Digital, Local |
| Sensing Temperature Range | -55°C ~ 125°C |
| Output Type | I2C |
| Resolution | 11 bits |
| Supply Voltage | 2.7V ~ 5.5V |
| Accuracy | ±2°C (-25°C ~ 100°C), ±3°C (-55°C ~ 125°C) |
| Package Type | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -55°C ~ 125°C |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution eligibility for the DS75U is determined by the following critical parameters:
Primary Compatibility Criteria:
- Sensing temperature range: -55°C ~ 125°C (full range required)
- Output interface: I2C or I2C/SMBus compatible
- Supply voltage: 2.7V ~ 5.5V minimum overlap
- Package type: 8-TSSOP or 8-MSOP surface mount
- Sensor type: Digital, local temperature sensing
- Mounting type: Surface mount
Substitute Categories:
Direct Equivalents (Identical Specifications):
- DS75U+ (Active status, RoHS3 compliant, identical electrical specifications, Tube packaging)
Pin-Compatible Substitutes (Enhanced Specifications):
- ADT75ARMZ, ADT75ARMZ-REEL, ADT75ARMZ-REEL7, ADT75BRMZ, ADT75BRMZ-REEL, ADT75BRMZ-REEL7 (12-bit resolution, I2C/SMBus, improved accuracy ±1°C for B-grade variants, Active status, RoHS3 compliant)
Cross-Manufacturer Alternatives (Functional Equivalence):
- LM75ADP,118 (NXP, 11-bit resolution, I2C, identical temperature range and accuracy, 8-TSSOP package, Active status, RoHS3 compliant)
- MCP9844T-BE/MNY, MCP9844T-BE/MNYAA (Microchip, I2C interface, internal sensor, different temperature range -40°C ~ 125°C, different package 8-TDFN, Active status, RoHS3 compliant)
Parameter Comparison
| Part Number | Manufacturer | Sensor Type | Temperature Range | Resolution | Output Type | Supply Voltage | Accuracy | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|
| DS75U | Analog Devices/Maxim | Digital, Local | -55°C ~ 125°C | 11 b | I2C | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-uMAX/uSOP | Obsolete | Non-compliant |
| DS75U+ | Analog Devices/Maxim | Digital, Local | -55°C ~ 125°C | 11 b | I2C | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-uMAX/uSOP | Active | RoHS3 Compliant |
| ADT75ARMZ | Analog Devices | Digital, Local | -55°C ~ 125°C | 12 b | I2C/SMBus | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-MSOP | Active | RoHS3 Compliant |
| ADT75ARMZ-REEL | Analog Devices | Digital, Local | -55°C ~ 125°C | 12 b | I2C/SMBus | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-MSOP | Active | RoHS3 Compliant |
| ADT75ARMZ-REEL7 | Analog Devices | Digital, Local | -55°C ~ 125°C | 12 b | I2C/SMBus | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-MSOP | Active | RoHS3 Compliant |
| ADT75BRMZ | Analog Devices | Digital, Local | -55°C ~ 125°C | 12 b | I2C/SMBus | 2.7V ~ 5.5V | ±1°C / ±3°C | 8-MSOP | Active | RoHS3 Compliant |
| ADT75BRMZ-REEL | Analog Devices | Digital, Local | -55°C ~ 125°C | 12 b | I2C/SMBus | 2.7V ~ 5.5V | ±1°C / ±3°C | 8-MSOP | Active | RoHS3 Compliant |
| ADT75BRMZ-REEL7 | Analog Devices | Digital, Local | -55°C ~ 125°C | 12 b | I2C/SMBus | 2.7V ~ 5.5V | ±1°C / ±3°C | 8-MSOP | Active | RoHS3 Compliant |
| LM75ADP,118 | NXP USA Inc. | Digital, Local | -55°C ~ 125°C | 11 b | I2C | 2.8V ~ 5.5V | ±2°C / ±3°C | 8-TSSOP | Active | RoHS3 Compliant |
| MCP9844T-BE/MNY | Microchip Technology | Internal | -40°C ~ 125°C | 16 b | I2C | 1.7V ~ 3.6V | ±3°C | 8-TDFN | Active | RoHS3 Compliant |
| MCP9844T-BE/MNYAA | Microchip Technology | Internal | -40°C ~ 125°C | 16 b | I2C | 1.7V ~ 3.6V | ±3°C | 8-TDFN | Active | RoHS3 Compliant |
Engineering Selection Recommendations
Tier 1 - Direct Replacement (Recommended for Pin-Compatible Designs):
DS75U+ is the primary direct equivalent. It maintains identical electrical specifications, temperature range, resolution, and I2C interface while offering Active product status and RoHS3 compliance. This part requires no design modification and provides the most straightforward migration path from the obsolete DS75U.
Tier 2 - Enhanced Pin-Compatible Substitutes (Recommended for New Designs):
ADT75BRMZ, ADT75BRMZ-REEL, and ADT75BRMZ-REEL7 offer improved accuracy (±1°C vs. ±2°C in the 0°C ~ 70°C range) with 12-bit resolution while maintaining the same 8-MSOP package footprint, supply voltage range, and temperature operating range. These parts are functionally superior and support I2C/SMBus protocols. Packaging variants (Tube, Cut Tape & Digi-Reel) accommodate different procurement and assembly workflows.
ADT75ARMZ, ADT75ARMZ-REEL, and ADT75ARMZ-REEL7 provide 12-bit resolution with standard ±2°C accuracy across the full temperature range, offering a middle-ground option between the DS75U and B-grade variants.
Tier 3 - Cross-Manufacturer Alternative (Recommended for Flexible Designs):
LM75ADP,118 (NXP) provides functional equivalence with identical 11-bit resolution, I2C interface, and temperature specifications. The 8-TSSOP package is pin-compatible with the DS75U's 8-TSSOP variant. This option is suitable for designs that can accommodate a different manufacturer within the same package family.
Tier 4 - Limited Compatibility (Conditional Use Only):
MCP9844T-BE/MNY and MCP9844T-BE/MNYAA (Microchip) offer I2C interface and overlapping temperature range but differ in sensor type (internal vs. local), package (8-TDFN vs. 8-uMAX/uSOP), and supply voltage (1.7V ~ 3.6V vs. 2.7V ~ 5.5V). These parts are suitable only for designs where package and supply voltage modifications are acceptable.
All recommended substitutes carry Active product status and RoHS3 compliance, ensuring long-term availability and regulatory alignment.
Frequently Asked Questions (FAQ)
Q: Can DS75U+ be used as a direct drop-in replacement for DS75U?
A: Yes. DS75U+ maintains identical electrical specifications, temperature range, resolution, and I2C interface. The primary difference is product status (Active vs. Obsolete) and RoHS compliance. No design changes are required.
Q: What is the advantage of ADT75BRMZ over DS75U+?
A: ADT75BRMZ offers 12-bit resolution (vs. 11-bit) and improved accuracy of ±1°C in the 0°C ~ 70°C operating range (vs. ±2°C). Both maintain the same supply voltage, temperature range, and I2C/SMBus interface. The 8-MSOP package is compatible with 8-TSSOP footprints in most layouts.
Q: Are ADT75 variants pin-compatible with DS75U?
A: ADT75 variants use 8-MSOP packaging, which is mechanically and electrically compatible with 8-TSSOP layouts. Both are 0.118" width, 3.00mm packages with identical pin assignments for I2C communication. Footprint verification is recommended during design review.
Q: Can LM75ADP,118 replace DS75U in existing designs?
A: LM75ADP,118 is functionally equivalent with matching 11-bit resolution, I2C interface, and -55°C ~ 125°C temperature range. The 8-TSSOP package is compatible. Supply voltage minimum is 2.8V (vs. 2.7V for DS75U), which may require verification in low-voltage applications.
Q: Why are MCP9844 parts listed as limited compatibility?
A: MCP9844 devices differ in three critical parameters: sensor type (internal vs. local), package (8-TDFN vs. 8-uMAX/uSOP), and supply voltage range (1.7V ~ 3.6V vs. 2.7V ~ 5.5V). These differences require PCB redesign and power supply reconfiguration. Use only when design flexibility permits.
Q: What packaging options are available for ADT75 substitutes?
A: ADT75 variants are available in three packaging formats: Tube (standard), Cut Tape & Digi-Reel (standard reel), and Cut Tape & Digi-Reel7 (7-inch reel). Selection depends on assembly volume and procurement requirements. All variants maintain identical electrical specifications.
Q: Are all substitute parts RoHS3 compliant?
A: Yes. All recommended substitutes carry RoHS3 compliance certification. The original DS75U is RoHS non-compliant. Compliance is mandatory for new production runs and long-term supply chain sustainability.
Q: What is the minimum supply voltage for each substitute?
A: DS75U+, ADT75 variants: 2.7V minimum. LM75ADP,118: 2.8V minimum. MCP9844 variants: 1.7V minimum. Verify supply voltage compatibility with your circuit design before selection.
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