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LM77CIM-5 Temperature Sensor Equivalent & Substitute Parts
Part Overview
The LM77CIM-5 is a digital temperature sensor manufactured by Texas Instruments, designed for local temperature measurement across the -55°C to 125°C range with 9-bit resolution and I2C output interface. The device operates on supply voltages between 3V and 5.5V and features programmable limit thresholds, output switching capability, and shutdown mode functionality.
This part is classified as obsolete. Identifying equivalent and substitute components is necessary to maintain design continuity, ensure supply chain reliability, and support long-term product availability for applications requiring digital temperature sensing with I2C communication.
Substiute Parts
Key Parameters
| Parameter | LM77CIM-5 |
|---|---|
| Sensor Type | Digital, Local |
| Sensing Temperature Range | -55°C ~ 125°C |
| Output Type | I2C |
| Resolution | 9 bits |
| Supply Voltage | 3V ~ 5.5V |
| Accuracy | ±1.5°C (-10°C ~ 65°C) / ±3°C (-55°C ~ 125°C) |
| Features | Output Switch, Programmable Limit, Shutdown Mode |
| Package | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Operating Temperature | -55°C ~ 125°C |
| RoHS Status | RoHS non-compliant |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitute parts for the LM77CIM-5 are identified based on the following critical parameters that determine functional compatibility:
Primary Compatibility Criteria:
- Output interface type (I2C serial communication)
- Temperature sensing capability and operating range overlap
- Supply voltage compatibility
- Resolution and accuracy specifications
- Surface mount package format
- Programmable threshold and alarm functionality
Substitution Logic:
The LM77CIM-5/NOPB is a direct equivalent from Texas Instruments, identical in electrical specifications and package format, differentiated only by packaging method (Tube) and improved RoHS3 compliance status.
The MCP9844T-BE series (MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, MCP9844T-BE/MNYAB) from Microchip Technology represents functional substitutes. These devices share the I2C output interface, internal temperature sensing capability, programmable alarm thresholds, and surface mount packaging. The MCP9844 operates across -40°C to 125°C, which overlaps the critical operating range of the LM77CIM-5. Both device families support 2-Wire Serial I2C communication, output alarm functionality, and equivalent accuracy specifications (±3°C maximum). The MCP9844 series is classified as active product status with full RoHS3 compliance, providing improved supply chain availability and regulatory alignment compared to the obsolete LM77CIM-5.
Parameter Comparison
| Parameter | LM77CIM-5 | LM77CIM-5/NOPB | MCP9844T-BE/MNY | MCP9844T-BE/MNYAA | MCP9844T-BE/MNYAB |
|---|---|---|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments | Microchip Technology | Microchip Technology | Microchip Technology |
| Sensor Type | Digital, Local | Digital, Local | Internal | Internal | Internal |
| Temperature Range | -55°C ~ 125°C | -55°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C | -40°C ~ 125°C |
| Output Type | I2C | I2C | 2-Wire Serial, I2C | 2-Wire Serial, I2C | 2-Wire Serial, I2C |
| Resolution | 9 bits | 9 bits | Not specified | Not specified | Not specified |
| Supply Voltage | 3V ~ 5.5V | 3V ~ 5.5V | 1.7V ~ 3.6V | 1.7V ~ 3.6V | 1.7V ~ 3.6V |
| Accuracy | ±1.5°C / ±3°C | ±1.5°C / ±3°C | ±3°C (Max) | ±3°C (Max) | ±3°C (Max) |
| Alarm/Threshold | Yes | Yes | Yes | Yes | Yes |
| Package | 8-SOIC | 8-SOIC | 8-TDFN (2x3) | 8-TDFN (2x3) | 8-TDFN (2x3) |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Obsolete | Active | Active | Active |
| RoHS Status | RoHS non-compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant | RoHS3 Compliant |
Engineering Selection Recommendations
LM77CIM-5/NOPB (Texas Instruments): This part maintains identical electrical and functional specifications to the LM77CIM-5, with the primary advantage of RoHS3 compliance status. It remains classified as obsolete, limiting its long-term availability. Selection of this substitute is appropriate only when design constraints require exact electrical equivalence and when supply can be confirmed through authorized distributors.
MCP9844T-BE Series (Microchip Technology): The MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB variants are active products with full RoHS3 compliance and superior supply chain availability. These devices provide functional substitution with I2C interface compatibility, programmable alarm thresholds, and equivalent accuracy specifications. The operating temperature range (-40°C to 125°C) covers the critical application window of the LM77CIM-5. The primary design consideration is the reduced supply voltage range (1.7V to 3.6V versus 3V to 5.5V) and package format transition from 8-SOIC to 8-TDFN, which may require PCB layout modifications. The MCP9844 series is recommended for new designs and long-term production continuity due to active product status and regulatory compliance.
Frequently Asked Questions (FAQ)
Q: Can the MCP9844T-BE series directly replace the LM77CIM-5 without PCB modifications?
A: The MCP9844T-BE series shares the I2C communication protocol and functional features with the LM77CIM-5, but differs in package format (8-TDFN versus 8-SOIC) and supply voltage range (1.7V–3.6V versus 3V–5.5V). PCB layout modifications are required to accommodate the different package footprint. Supply voltage circuits must be verified to operate within the MCP9844 specification window.
Q: What is the temperature measurement overlap between the LM77CIM-5 and MCP9844T-BE?
A: The LM77CIM-5 operates from -55°C to 125°C, while the MCP9844T-BE operates from -40°C to 125°C. Both devices function across the -40°C to 125°C range. Applications requiring measurement below -40°C must retain the LM77CIM-5 or equivalent.
Q: Are the MCP9844T-BE variants (MNY, MNYAA, MNYAB) functionally identical?
A: The MCP9844T-BE/MNY, MCP9844T-BE/MNYAA, and MCP9844T-BE/MNYAB variants are functionally equivalent. Differences are limited to packaging format (Cut Tape & Digi-Reel, Tape & Reel, and unspecified packaging respectively) and inventory availability. Selection among variants depends on procurement and assembly requirements.
Q: Why is the LM77CIM-5/NOPB listed as a substitute if it is also obsolete?
A: The LM77CIM-5/NOPB is an exact electrical equivalent with improved RoHS3 compliance status. It serves as an intermediate substitute option for applications where design constraints require identical specifications. However, both variants are obsolete; the MCP9844T-BE series is recommended for sustained product availability.
Q: What are the key differences in accuracy specifications?
A: The LM77CIM-5 specifies ±1.5°C accuracy across -10°C to 65°C and ±3°C across -55°C to 125°C. The MCP9844T-BE specifies ±3°C maximum accuracy across its full -40°C to 125°C operating range. Applications requiring ±1.5°C accuracy within the -10°C to 65°C window should evaluate the MCP9844 performance characteristics against specific requirements.
Q: Is I2C protocol compatibility sufficient for direct firmware compatibility?
A: Both the LM77CIM-5 and MCP9844T-BE employ I2C serial communication and support programmable threshold registers and alarm outputs. However, register mapping, command sequences, and alarm output behavior may differ between devices. Firmware validation is required to confirm functional compatibility before production deployment.
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