LM75AD,112 Equivalent & Substitute Parts

Part Overview

The LM75AD,112 is a digital temperature sensor manufactured by NXP USA Inc., designed for local temperature measurement across the -55°C to 125°C range with 11-bit resolution and I2C output interface. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The sensor operates on supply voltages between 2.8V and 5.5V, featuring programmable limits, output switching, and shutdown mode capabilities in an 8-SOIC package.

Key Parameters

Parameter	LM75AD,112
Manufacturer	NXP USA Inc.
Product Status	Obsolete
Sensor Type	Digital, Local
Sensing Temperature Range	-55°C ~ 125°C
Output Type	I2C
Voltage Supply	2.8V ~ 5.5V
Resolution	11 bits
Accuracy	±2°C (-25°C ~ 100°C) / ±3°C (-55°C ~ 125°C)
Package	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
MSL Rating	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the LM75AD,112 are selected based on the following critical parameters that determine functional equivalence:

Core Substitution Criteria:

Sensor Type: Digital, Local temperature measurement
Temperature Range: -55°C to 125°C operating capability
Output Interface: I2C/SMBus protocol compatibility
Resolution: 11-bit digital output
Package: 8-SOIC form factor with 0.154" width (3.90mm)
Mounting: Surface mount technology
Supply Voltage: Compatibility with 2.8V minimum requirement
Features: Output switch, programmable limits, programmable resolution, shutdown mode

All substitute parts listed maintain these core electrical and mechanical parameters, ensuring direct functional replacement in existing circuit designs. Variations in accuracy specifications, MSL ratings, and product status are noted but do not prevent substitution when application requirements are met.

Parameter Comparison

Parameter	LM75AD,112	AT30TS74-SS8M-B	AT30TS74-SS8M-T	AT30TS750A-SS8M-B	AT30TS75A-SS8M-T	AT30TSE752A-SS8M-B	AT30TSE752A-SS8M-T	AT30TSE754A-SS8M-B	AT30TSE758A-SS8M-B	AT30TSE758A-SS8M-T	MCP9844T-BE/MNY
Manufacturer	NXP USA Inc.	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology	Microchip Technology
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active	Active	Active
Sensor Type	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Digital, Local	Internal
Sensing 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	-55°C ~ 125°C	-40°C ~ 125°C
Output Type	I2C	I2C/SMBus	I2C/SMBus	I2C/SMBus	I2C/SMBus	I2C/SMBus	I2C/SMBus	I2C/SMBus	I2C/SMBus	I2C/SMBus	2-Wire Serial, I2C
Voltage Supply	2.8V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 5.5V	1.7V ~ 3.6V
Resolution	11 bits	11 bits	11 bits	11 bits	11 bits	11 bits	11 bits	11 bits	11 bits	11 bits	Not specified
Accuracy	±2°C / ±3°C	±2°C / ±3°C	±2°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C	±1°C / ±3°C	±3°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-WFDFN Exposed Pad
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	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)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (8-SOIC Package, I2C/SMBus Interface):

The AT30TS74-SS8M-B, AT30TS74-SS8M-T, AT30TS750A-SS8M-B, AT30TS75A-SS8M-T, AT30TSE752A-SS8M-B, AT30TSE752A-SS8M-T, AT30TSE754A-SS8M-B, AT30TSE758A-SS8M-B, and AT30TSE758A-SS8M-T are all active Microchip Technology products that maintain the 8-SOIC package form factor and I2C/SMBus communication protocol. All are ROHS3 compliant and REACH unaffected. These parts support the full -55°C to 125°C operating temperature range and provide 11-bit resolution with programmable limits and shutdown mode features.

Packaging Considerations:

Substitute parts are available in multiple packaging formats: Tube (B suffix), Cut Tape & Digi-Reel (CT), and Tape & Reel (TR). Selection depends on production volume and supply chain requirements. MSL ratings vary between 1 (Unlimited) and 3 (168 Hours), affecting storage and handling protocols.

Voltage Supply Compatibility:

All Microchip substitutes operate at 1.7V minimum supply voltage, providing broader compatibility than the LM75AD,112 (2.8V minimum). This represents an improvement for low-voltage applications. The MCP9844T-BE/MNY operates at 1.7V to 3.6V, limiting use in 5V systems.

Alternative Package Option:

The MCP9844T-BE/MNY provides an alternative in 8-WFDFN package with exposed pad, featuring internal sensor topology and 2-Wire Serial/I2C output. This part operates at -40°C to 125°C (narrower low-temperature range) and 1.7V to 3.6V supply voltage, making it suitable only for applications not requiring -55°C operation or 5V supply compatibility.

Frequently Asked Questions (FAQ)

Q: Can AT30TS74-SS8M-B directly replace LM75AD,112 in existing designs?

A: Yes. Both parts share the 8-SOIC package, I2C interface, -55°C to 125°C temperature range, 11-bit resolution, and core features including programmable limits and shutdown mode. Pin-to-pin compatibility is maintained.

Q: What is the difference between AT30TSE752A and AT30TS75A variants?

A: Both support identical electrical specifications and temperature ranges. The AT30TSE752A and AT30TSE758A variants are available in the provided inventory. Selection depends on packaging format (Tube vs. Tape & Reel) and MSL rating requirements for your supply chain.

Q: Why does MCP9844T-BE/MNY use a different package?

A: The MCP9844T-BE/MNY uses 8-WFDFN package instead of 8-SOIC. This package change requires PCB layout modification and is not a direct pin-compatible replacement. Use this part only when board redesign is acceptable.

Q: Are all substitutes ROHS3 compliant?

A: Yes. All listed substitute parts are ROHS3 compliant and REACH unaffected, matching the environmental compliance status of the LM75AD,112.

Q: What MSL rating should I select?

A: MSL 1 (Unlimited) parts—AT30TS75A-SS8M-T, AT30TSE752A-SS8M-B, AT30TSE754A-SS8M-B, and AT30TS75A-SS8M-T—require no moisture bake-out before soldering. MSL 3 (168 Hours) parts require bake-out if storage exceeds specified time limits. Choose MSL 1 for simplified supply chain handling.

Q: Can I use these sensors in 5V systems?

A: All Microchip AT30TS and AT30TSE variants support 5.5V maximum supply voltage, compatible with 5V systems. The MCP9844T-BE/MNY is limited to 3.6V maximum and is not suitable for 5V applications.

Q: What is the minimum supply voltage for substitutes?

A: Microchip AT30TS and AT30TSE series operate at 1.7V minimum, lower than the LM75AD,112 (2.8V minimum). This provides improved flexibility for low-voltage designs. MCP9844T-BE/MNY also operates at 1.7V minimum but is limited to 3.6V maximum.

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