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DS1631Z Equivalent & Substitute Parts
Part Overview
The DS1631Z 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 11-bit resolution and is housed in an 8-SOIC surface mount package. The DS1631Z is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts must maintain functional compatibility while meeting current RoHS and compliance standards.
Substiute Parts
Key Parameters
| Parameter | DS1631Z Specification |
|---|---|
| Sensor Type | Digital, Local |
| Sensing Temperature Range | -55°C ~ 125°C |
| Output Type | I2C |
| Supply Voltage | 2.7V ~ 5.5V |
| Resolution | 11 bits |
| Accuracy | ±0.5°C (0°C ~ 70°C), ±2°C (-55°C ~ 125°C) |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Features | One-Shot, Output Switch, Programmable Limit, Programmable Resolution, Standby Mode |
Substitute Part Grouping Explanation
Substitution for the DS1631Z is determined by the following critical parameters:
- Package Compatibility: All substitutes must use 8-SOIC surface mount packaging with identical 0.154" (3.90mm) width
- Temperature Range: Minimum -55°C to 125°C local sensing capability
- Resolution: 11-bit resolution to maintain measurement precision
- Interface Protocol: I2C or I2C/SMBus compatibility for direct pin-level replacement
- Supply Voltage: 2.7V to 5.5V operating range
- Accuracy: ±0.5°C to ±2°C within specified temperature bands
Parts are grouped into three categories: direct equivalents (same manufacturer, updated packaging), upgrades (alternative manufacturers with enhanced specifications), and manufacturer-recommended alternatives (functionally compatible with design considerations).
Parameter Comparison
| Part Number | Manufacturer | Status | Temp Range | Resolution | Interface | Supply Voltage | Accuracy | Package | RoHS |
|---|---|---|---|---|---|---|---|---|---|
| DS1631Z | Analog Devices/Maxim | Obsolete | -55°C ~ 125°C | 11 b | I2C | 2.7V ~ 5.5V | ±0.5°C / ±2°C | 8-SOIC | Non-compliant |
| DS1631Z+ | Analog Devices/Maxim | Active | -55°C ~ 125°C | 11 b | I2C | 2.7V ~ 5.5V | ±0.5°C / ±2°C | 8-SOIC | ROHS3 Compliant |
| TMP175AID | Texas Instruments | Obsolete | -40°C ~ 125°C | 9 b | I2C/SMBus | 2.7V ~ 5.5V | ±1.5°C / ±2°C | 8-SOIC | ROHS3 Compliant |
| TMP175AIDR | Texas Instruments | Active | -40°C ~ 125°C | 9 b | I2C/SMBus | 2.7V ~ 5.5V | ±1.5°C / ±2°C | 8-SOIC | ROHS3 Compliant |
| TMP275AID | Texas Instruments | Obsolete | -40°C ~ 125°C | 11 b | SMBus | 2.7V ~ 5.5V | ±0.5°C / ±1.5°C | 8-SOIC | ROHS3 Compliant |
| TMP275AIDR | Texas Instruments | Active | -40°C ~ 125°C | 11 b | SMBus | 2.7V ~ 5.5V | ±0.5°C / ±1.5°C | 8-SOIC | ROHS3 Compliant |
| TMP75AID | Texas Instruments | Obsolete | -40°C ~ 125°C | 11 b | I2C/SMBus | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-SOIC | ROHS3 Compliant |
| TMP75AIDR | Texas Instruments | Active | -40°C ~ 125°C | 11 b | I2C/SMBus | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-SOIC | ROHS3 Compliant |
| TMP75AIDRG4 | Texas Instruments | Obsolete | -40°C ~ 125°C | 11 b | I2C/SMBus | 2.7V ~ 5.5V | ±2°C / ±3°C | 8-SOIC | ROHS3 Compliant |
| AT30TS74-SS8M-B | Microchip Technology | Active | -55°C ~ 125°C | 11 b | I2C/SMBus | 1.7V ~ 5.5V | ±2°C / ±3°C | 8-SOIC | ROHS3 Compliant |
| AT30TS74-SS8M-T | Microchip Technology | Active | -55°C ~ 125°C | 11 b | I2C/SMBus | 1.7V ~ 5.5V | ±2°C / ±3°C | 8-SOIC | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Equivalent (Preferred for Immediate Replacement)
DS1631Z+ is the direct successor to DS1631Z from the same manufacturer. It maintains identical electrical specifications and package format while achieving ROHS3 compliance. This part is currently in active production status with adequate inventory availability.
Active Production Alternatives
TMP175AIDR and TMP275AIDR from Texas Instruments provide active production alternatives. TMP175AIDR operates with 9-bit resolution and reduced accuracy (±1.5°C), suitable for applications where lower resolution is acceptable. TMP275AIDR matches the 11-bit resolution and improved accuracy (±0.5°C) of the original DS1631Z, with SMBus interface compatibility. TMP75AIDR provides 11-bit resolution with I2C/SMBus dual interface support and higher inventory availability.
Manufacturer-Recommended Alternative
AT30TS74-SS8M-B and AT30TS74-SS8M-T from Microchip Technology are manufacturer-recommended substitutes. Both maintain the full -55°C to 125°C temperature range and 11-bit resolution. The AT30TS74 series offers extended supply voltage range (1.7V minimum) and I2C/SMBus compatibility. Packaging options include tube (B variant) and cut tape with digi-reel (T variant) for different procurement requirements.
Obsolete Part Considerations
TMP175AID, TMP275AID, TMP75AID, and TMP75AIDRG4 are classified as obsolete. While currently in inventory, these parts should not be selected for new designs. Existing designs using these parts should transition to active production alternatives during the next design revision cycle.
Frequently Asked Questions (FAQ)
Q: Can DS1631Z be directly replaced with DS1631Z+?
A: Yes. DS1631Z+ is the direct successor with identical electrical and mechanical specifications. The primary difference is RoHS3 compliance status. Pin configuration, package dimensions, and functional behavior remain unchanged.
Q: What is the key difference between TMP175AIDR and TMP275AIDR?
A: Resolution and accuracy differ. TMP175AIDR provides 9-bit resolution with ±1.5°C accuracy, while TMP275AIDR provides 11-bit resolution with ±0.5°C accuracy. Both operate across -40°C to 125°C. Select TMP275AIDR when 11-bit precision is required.
Q: Are TMP75AIDR and AT30TS74-SS8M-T pin-compatible with DS1631Z?
A: Both use identical 8-SOIC packaging with matching pin assignments for I2C/SMBus operation. However, verify I2C address configuration in your application, as different manufacturers may use different default address settings.
Q: What is the temperature range limitation when using TMP175AIDR instead of DS1631Z?
A: TMP175AIDR operates from -40°C to 125°C, while DS1631Z operates from -55°C to 125°C. Applications requiring operation below -40°C must use DS1631Z+, TMP275AIDR, TMP75AIDR, or AT30TS74 series.
Q: Which substitute offers the lowest minimum supply voltage?
A: AT30TS74-SS8M-B and AT30TS74-SS8M-T from Microchip Technology operate at 1.7V minimum, compared to 2.7V for most alternatives. This provides additional flexibility for low-power applications.
Q: What packaging options are available for active production parts?
A: DS1631Z+ is supplied in tube packaging. TMP175AIDR and TMP275AIDR are available in tube. TMP75AIDR is supplied in cut tape with digi-reel. AT30TS74-SS8M-B is supplied in tube, while AT30TS74-SS8M-T is supplied in cut tape with digi-reel. Select based on your procurement and assembly requirements.
Q: Are all substitute parts RoHS3 compliant?
A: All active production substitutes (DS1631Z+, TMP175AIDR, TMP275AIDR, TMP75AIDR, AT30TS74-SS8M-B, AT30TS74-SS8M-T) are ROHS3 compliant. Obsolete parts maintain ROHS3 compliance but should not be used in new designs.
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