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AT30TS75-SS8-T Equivalent & Substitute Parts
Part Overview
The AT30TS75-SS8-T is a digital temperature sensor manufactured by Microchip Technology, designed for local temperature measurement across the -55°C to 125°C range with 11-bit resolution and I2C/SMBus interface. The device operates on supply voltages from 2.7V to 5.5V and is packaged in an 8-SOIC surface mount configuration. This part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support, production continuity, and new system implementations.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer Part Number | AT30TS75-SS8-T |
| Manufacturer | Microchip Technology |
| Sensor Type | Digital, Local |
| Sensing Temperature Range | -55°C ~ 125°C |
| Output Type | I2C/SMBus |
| Supply Voltage | 2.7V ~ 5.5V |
| Resolution | 11 bits |
| Accuracy | ±1.5°C (0°C ~ 55°C), ±3°C (-20°C ~ 125°C) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the AT30TS75-SS8-T is determined by the following critical parameters:
Primary Compatibility Criteria:
- Sensor type: Digital, local temperature measurement
- Temperature range: -55°C to 125°C minimum
- Output interface: I2C or SMBus compatible
- Package: 8-SOIC or 8-SO surface mount
- Supply voltage: Minimum 2.7V operation required
- Resolution: 11-bit preferred; 9-bit acceptable with functional equivalence
Substitution Logic: Substitute parts are grouped into two categories based on resolution and feature alignment. Direct substitutes maintain 11-bit resolution and full feature parity (AT30TS74-SS8M-T, AT30TS75A-SS8M-T). Secondary substitutes operate at 9-bit resolution but maintain core temperature measurement and I2C interface functionality (LM75 series variants). All substitutes comply with ROHS3 and operate within the specified temperature and voltage ranges.
Parameter Comparison
| Parameter | AT30TS75-SS8-T | AT30TS74-SS8M-T | AT30TS75A-SS8M-T | LM75AD,118 | LM75AIM/NOPB | LM75AIMX/NOPB | LM75BD,118 | LM75BIM-3+ | LM75BIM-5+ |
|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Microchip | Microchip | Microchip | NXP USA Inc. | Texas Instruments | Texas Instruments | NXP USA Inc. | Analog Devices/Maxim | Analog Devices/Maxim |
| Sensor Type | Digital, Local | Digital, Local | Digital, Local | Digital, Local | Digital, Local | Digital, Local | Digital, Local | Digital, Local | Digital, Local |
| Temperature Range | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C | -55°C ~ 125°C |
| Output Type | I2C/SMBus | I2C/SMBus | I2C/SMBus | I2C | I2C | I2C | I2C | I2C | I2C |
| Supply Voltage | 2.7V ~ 5.5V | 1.7V ~ 5.5V | 1.7V ~ 5.5V | 2.8V ~ 5.5V | 2.7V ~ 5.5V | 2.7V ~ 5.5V | 2.8V ~ 5.5V | 3V ~ 5.5V | 3V ~ 5.5V |
| Resolution | 11 bits | 11 bits | 11 bits | 11 bits | 9 bits | 9 bits | 11 bits | 9 bits | 9 bits |
| Accuracy | ±1.5°C (±3°C) | ±2°C (±3°C) | ±1°C (±3°C) | ±2°C (±3°C) | ±2°C (±3°C) | ±2°C (±3°C) | ±2°C (±3°C) | ±2°C (±3°C) | ±2°C (±3°C) |
| Package | 8-SOIC | 8-SOIC | 8-SOIC | 8-SO | 8-SOIC | 8-SOIC | 8-SO | 8-SOIC | 8-SOIC |
| Product Status | Obsolete | Active | Active | Active | Obsolete | Active | Active | Active | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| MSL Rating | 1 (Unlimited) | 3 (168 Hours) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) | 1 (Unlimited) |
Engineering Selection Recommendations
Tier 1 - Direct Substitutes (11-bit Resolution, Active Status):
AT30TS75A-SS8M-T and AT30TS74-SS8M-T are the primary substitutes for the obsolete AT30TS75-SS8-T. Both are manufactured by Microchip Technology, maintain 11-bit resolution, and are currently in active production status. AT30TS75A-SS8M-T offers superior accuracy (±1°C vs. ±1.5°C) and is available in Tape & Reel packaging. AT30TS74-SS8M-T provides extended lower supply voltage operation (1.7V minimum) and is available in Cut Tape & Digi-Reel packaging. Both devices are ROHS3 compliant and support the full -55°C to 125°C temperature range.
Tier 2 - Secondary Substitutes (11-bit Resolution, Active Status, Alternative Manufacturers):
LM75AD,118 (NXP USA Inc.) and LM75BD,118 (NXP USA Inc.) maintain 11-bit resolution and active product status. Both operate on I2C interface with -55°C to 125°C temperature range and ROHS3 compliance. Supply voltage minimum is 2.8V, which is compatible with the original part's 2.7V specification for most applications. These devices are available in Cut Tape & Digi-Reel packaging.
Tier 3 - Functional Substitutes (9-bit Resolution, Active Status):
LM75AIMX/NOPB (Texas Instruments), LM75BIM-3+ (Analog Devices/Maxim), and LM75BIM-5+ (Analog Devices/Maxim) operate at 9-bit resolution with active product status. These devices maintain I2C interface compatibility, -55°C to 125°C temperature range, and ROHS3 compliance. The reduced resolution (9-bit vs. 11-bit) results in lower temperature measurement granularity but maintains functional equivalence for applications where ±0.0625°C step resolution is not critical. LM75BIM-3+ and LM75BIM-5+ have the highest inventory availability (888,800 and 2,069 units respectively).
Obsolete Alternatives (Not Recommended for New Designs):
LM75AIM/NOPB and LM75BIM-3/NOPB are obsolete products and should not be selected for new designs or long-term production requirements.
Frequently Asked Questions (FAQ)
Q: Can AT30TS75A-SS8M-T directly replace AT30TS75-SS8-T without circuit modifications?
A: Yes. Both devices operate on identical temperature ranges (-55°C to 125°C), I2C/SMBus interface, 11-bit resolution, and 8-SOIC packaging. Supply voltage compatibility is maintained (2.7V minimum for original, 1.7V minimum for substitute). Pin-to-pin compatibility is confirmed for direct PCB substitution.
Q: What is the functional difference between 11-bit and 9-bit resolution substitutes?
A: 11-bit resolution provides 0.0625°C temperature measurement steps across the full range. 9-bit resolution provides 0.5°C steps. For applications requiring temperature monitoring with ±1°C or greater accuracy tolerance, 9-bit devices are functionally equivalent. Applications requiring finer temperature granularity or precise threshold detection must use 11-bit substitutes.
Q: Are LM75 series devices (NXP, Texas Instruments, Analog Devices) pin-compatible with AT30TS75-SS8-T?
A: Yes. All LM75 variants listed maintain 8-SOIC or 8-SO packaging with identical pin assignments for temperature sensor operation. I2C interface pinouts are standardized across all listed substitutes. Physical package dimensions (0.154" width, 3.90mm) are consistent.
Q: What is the impact of supply voltage differences between substitutes?
A: AT30TS75-SS8-T operates on 2.7V minimum. AT30TS74-SS8M-T and AT30TS75A-SS8M-T operate on 1.7V minimum, providing extended low-voltage capability. LM75 series devices (NXP) require 2.8V minimum, which is 0.1V higher than the original. For systems operating at exactly 2.7V, verify that the substitute's minimum specification does not exceed system supply voltage. Most applications operating at 3.3V or 5V are unaffected.
Q: How does MSL (Moisture Sensitivity Level) rating affect component selection?
A: AT30TS75-SS8-T and AT30TS75A-SS8M-T carry MSL 1 (unlimited shelf life without baking). AT30TS74-SS8M-T carries MSL 3 (168-hour shelf life, requiring bake-out before reflow if storage exceeds limit). For high-volume production with extended component storage, MSL 1 rated devices reduce moisture-related reflow defects. MSL 3 devices require proper storage and handling protocols.
Q: Which substitute offers the best inventory availability?
A: LM75BIM-3+ (Analog Devices/Maxim) provides the highest inventory at 888,800 units. This device operates at 9-bit resolution with active product status and ROHS3 compliance. For applications where 9-bit resolution is acceptable, this substitute offers supply chain continuity and cost efficiency.
Q: Are all listed substitutes ROHS3 compliant?
A: Yes. All substitute parts listed carry ROHS3 compliance certification, matching the original AT30TS75-SS8-T compliance status. All devices are REACH unaffected and classified under ECCN EAR99 with HTSUS code 8542.39.0001.
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