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LM99-1CIMMX Equivalent & Substitute Parts
Part Overview
The LM99-1CIMMX is a digital temperature sensor manufactured by Texas Instruments, designed for local and remote temperature monitoring across the 0°C to 85°C range. This component features SMBus output, 7-bit local and 11-bit remote resolution, and operates on 3V to 3.6V supply voltage. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.
Substiute Parts
Key Parameters
| Parameter | LM99-1CIMMX |
|---|---|
| Sensor Type | Digital, Local/Remote |
| Sensing Temperature - Local | 0°C ~ 85°C |
| Sensing Temperature - Remote | 0°C ~ 85°C |
| Output Type | SMBus |
| Voltage - Supply | 3V ~ 3.6V |
| Resolution | 7 b (Local), 11 b (Remote) |
| Accuracy | ±3°C |
| Operating Temperature | 0°C ~ 125°C |
| Package / Case | 8-TSSOP, 8-MSOP (0.118", 3.00mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | RoHS non-compliant |
Substitute Part Grouping Explanation
Substitution of the LM99-1CIMMX is determined by the following critical parameters:
Core Functional Requirements:
- Sensor Type: Digital, Local/Remote capability
- Output Interface: SMBus protocol
- Supply Voltage Range: 3V ~ 3.6V compatibility
- Package / Case: 8-TSSOP or 8-MSOP form factor (0.118", 3.00mm Width)
- Mounting Type: Surface Mount
Temperature Sensing Capability: Substitute parts must support at minimum the local sensing range of 0°C ~ 85°C. Parts with extended temperature ranges remain compatible as they encompass the original specification.
Resolution and Accuracy: The original part specifies 7-bit local and 11-bit remote resolution with ±3°C accuracy. Substitute parts with equal or superior resolution and accuracy specifications maintain functional equivalence.
Compliance Considerations: The LM99-1CIMMX is RoHS non-compliant. Active substitute parts with ROHS3 compliance are acceptable for new designs and legacy system replacements where regulatory requirements have evolved.
Parameter Comparison
| Part Number | Manufacturer | Sensor Type | Local Temp Range | Remote Temp Range | Output Type | Supply Voltage | Resolution | Accuracy | Package | Product Status | RoHS Status |
|---|---|---|---|---|---|---|---|---|---|---|---|
| LM99-1CIMMX | Texas Instruments | Digital, Local/Remote | 0°C ~ 85°C | 0°C ~ 85°C | SMBus | 3V ~ 3.6V | 7 b (Local), 11 b (Remote) | ±3°C | 8-VSSOP | Obsolete | RoHS non-compliant |
| LM99-1CIMM/NOPB | Texas Instruments | Digital, Local/Remote | 0°C ~ 85°C | 0°C ~ 85°C | SMBus | 3V ~ 3.6V | 7 b (Local), 11 b (Remote) | ±3°C | 8-VSSOP | Active | ROHS3 Compliant |
| EMC1402-1-ACZL-TR | Microchip Technology | Digital, Local/Remote | -40°C ~ 125°C | -64°C ~ 191°C | SMBus | 3V ~ 3.6V | 11 b | ±1°C (±2°C) | 8-MSOP | Active | ROHS3 Compliant |
| EMC1402-2-ACZL-TR | Microchip Technology | Digital, Local/Remote | -40°C ~ 125°C | -64°C ~ 191°C | SMBus | 3V ~ 3.6V | 11 b | ±1°C (±2°C) | 8-MSOP | Active | ROHS3 Compliant |
| EMC1402-3-ACZL-TR | Microchip Technology | Digital, Local/Remote | -40°C ~ 125°C | -64°C ~ 191°C | SMBus | 3V ~ 3.6V | 11 b | ±1°C (±2°C) | 8-MSOP | Active | ROHS3 Compliant |
| EMC1402-4-ACZL-TR | Microchip Technology | Digital, Local/Remote | -40°C ~ 125°C | -64°C ~ 191°C | SMBus | 3V ~ 3.6V | 11 b | ±1°C (±2°C) | 8-MSOP | Active | ROHS3 Compliant |
| EMC1072-1-ACZL-TR | Microchip Technology | Digital, Local/Remote | -40°C ~ 125°C | -64°C ~ 191°C | SMBus | 3V ~ 3.6V | 11 b | ±1°C (±2°C) | 8-MSOP | Active | ROHS3 Compliant |
| EMC1072-A-ACZL-TR | Microchip Technology | Digital, Local/Remote | -40°C ~ 125°C | -64°C ~ 191°C | SMBus | 3V ~ 3.6V | 11 b | ±1°C (±2°C) | 8-TSSOP | Active | ROHS3 Compliant |
| EMC1422-1-ACZL-TR | Microchip Technology | Digital, Local/Remote | -40°C ~ 125°C | -64°C ~ 191°C | SMBus | 3V ~ 3.6V | 11 b | ±1°C (±2°C) | 8-MSOP | Active | ROHS3 Compliant |
| ADT7461ARMZ-R7 | onsemi | Digital, Local/Remote | -40°C ~ 120°C | -55°C ~ 150°C | SMBus | 3V ~ 5.5V | 8 b | ±3°C | 8-MSOP | Active | ROHS3 Compliant |
Engineering Selection Recommendations
Direct Replacement (Texas Instruments): LM99-1CIMM/NOPB is the active equivalent from Texas Instruments. It maintains identical electrical specifications and package configuration as the LM99-1CIMMX while offering ROHS3 compliance and active product status. This part is suitable for direct substitution in existing designs.
Extended Temperature Range Alternatives (Microchip Technology): The EMC1402 series (EMC1402-1-ACZL-TR, EMC1402-2-ACZL-TR, EMC1402-3-ACZL-TR, EMC1402-4-ACZL-TR) and EMC1072 series (EMC1072-1-ACZL-TR, EMC1072-A-ACZL-TR) provide extended operating temperature ranges (-40°C ~ 125°C) with improved accuracy (±1°C to ±2°C) and 11-bit resolution. These parts are ROHS3 compliant and actively supported. The EMC1072-A-ACZL-TR is available in 8-TSSOP packaging, matching the original form factor more closely than 8-MSOP variants.
Broad Supply Voltage Alternative (onsemi): ADT7461ARMZ-R7 supports an extended supply voltage range (3V ~ 5.5V) and operates across -40°C ~ 120°C. This part is suitable for applications requiring wider voltage tolerance while maintaining SMBus compatibility and ROHS3 compliance.
Feature Consideration: EMC1422-1-ACZL-TR omits the One-Shot feature present in the original LM99-1CIMMX but retains Output Switch, Programmable Limit, and Shutdown Mode functionality. This part is appropriate for applications not requiring one-shot measurement capability.
Frequently Asked Questions (FAQ)
Q: Can LM99-1CIMM/NOPB be used as a direct replacement for LM99-1CIMMX? A: Yes. Both parts share identical electrical specifications, SMBus interface, supply voltage range (3V ~ 3.6V), and 8-VSSOP package configuration. The primary difference is product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).
Q: What are the key differences between EMC1402 and EMC1072 series? A: Both series provide identical electrical performance with -40°C ~ 125°C operating range, 11-bit resolution, and ±1°C to ±2°C accuracy. The primary distinction is packaging: EMC1072-A-ACZL-TR is available in 8-TSSOP, while EMC1402 variants use 8-MSOP. Moisture sensitivity levels vary by part number.
Q: Is the ADT7461ARMZ-R7 compatible with 3V ~ 3.6V supply systems? A: Yes. The ADT7461ARMZ-R7 supports 3V ~ 5.5V supply voltage, encompassing the original 3V ~ 3.6V range. However, it operates across -40°C ~ 120°C, extending beyond the original 0°C ~ 85°C specification.
Q: Do all substitute parts maintain SMBus protocol compatibility? A: Yes. All listed substitute parts use SMBus output interface, ensuring protocol compatibility with existing system designs.
Q: What packaging options are available for substitutes? A: Substitute parts are available in 8-MSOP and 8-TSSOP packages, both maintaining the 0.118" (3.00mm) width specification. EMC1072-A-ACZL-TR specifically matches the 8-TSSOP form factor of the original part.
Q: Are all substitute parts RoHS compliant? A: All listed substitute parts are ROHS3 compliant. The original LM99-1CIMMX is RoHS non-compliant. Compliance status should be verified against specific regulatory requirements for your application.
Q: Which substitute offers the best accuracy improvement? A: EMC1402 and EMC1072 series provide ±1°C to ±2°C accuracy, compared to the original ±3°C specification. ADT7461ARMZ-R7 maintains ±3°C accuracy equivalent to the original part.
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