LM61CIZ Temperature Sensor Equivalent & Substitute Parts

Part Overview

The LM61CIZ is an analog temperature sensor manufactured by Texas Instruments, designed for local temperature measurement across a -30°C to 100°C range with 10mV/°C output resolution. The device operates on a 2.7V to 10V supply and features a shutdown mode for power management. However, the LM61CIZ is classified as obsolete, which necessitates identification of active equivalent parts to ensure design continuity and long-term supply chain reliability.

Key Parameters

Parameter	Value
Sensor Type	Analog, Local
Sensing Temperature Range	-30°C ~ 100°C
Output Type	Analog Voltage
Resolution	10mV/°C
Supply Voltage	2.7V ~ 10V
Accuracy	±3°C (±4°C)
Package Type	TO-92-3 (TO-226AA)
Mounting Type	Through Hole
Features	Shutdown Mode

Substitute Part Grouping Explanation

Substitution of the LM61CIZ is determined by strict equivalence across the following critical parameters:

Sensor Type & Measurement: Analog, local temperature sensing only
Temperature Range: -30°C to 100°C minimum coverage
Output Characteristics: Analog voltage output at 10mV/°C
Supply Voltage Compatibility: 2.7V to 10V operation
Accuracy Specification: ±3°C to ±4°C tolerance
Package & Mounting: TO-92-3 through-hole configuration
Functional Features: Shutdown mode capability

The LM61CIZ/NOPB qualifies as a direct substitute because it maintains identical electrical specifications, temperature range, output resolution, supply voltage requirements, accuracy, and physical packaging while offering active product status and improved compliance certifications.

Parameter Comparison

Parameter	LM61CIZ	LM61CIZ/NOPB	Match
Manufacturer	Texas Instruments	Texas Instruments	✓
Sensor Type	Analog, Local	Analog, Local	✓
Sensing Temperature Range	-30°C ~ 100°C	-30°C ~ 100°C	✓
Output Type	Analog Voltage	Analog Voltage	✓
Resolution	10mV/°C	10mV/°C	✓
Supply Voltage	2.7V ~ 10V	2.7V ~ 10V	✓
Accuracy	±3°C (±4°C)	±3°C (±4°C)	✓
Operating Temperature	-30°C ~ 100°C	-30°C ~ 100°C	✓
Package / Case	TO-92-3 (TO-226AA)	TO-92-3 (TO-226AA)	✓
Mounting Type	Through Hole	Through Hole	✓
Features	Shutdown Mode	Shutdown Mode	✓
Product Status	Obsolete	Active	Improved
RoHS Status	RoHS non-compliant	ROHS3 Compliant	Improved

Engineering Selection Recommendations

The LM61CIZ/NOPB is the direct functional equivalent of the LM61CIZ. Selection of the LM61CIZ/NOPB is justified on the following grounds:

Product Status: The LM61CIZ/NOPB maintains active product status, ensuring ongoing availability and manufacturer support, whereas the original LM61CIZ is obsolete.
Regulatory Compliance: The LM61CIZ/NOPB is ROHS3 compliant, meeting current environmental and regulatory requirements. The original part is RoHS non-compliant.
Electrical Equivalence: All electrical parameters, including temperature range, output resolution, supply voltage, accuracy, and functional features, are identical.
Physical Compatibility: Both parts use identical TO-92-3 through-hole packaging, ensuring direct PCB compatibility without layout modifications.
Supply Chain Reliability: The LM61CIZ/NOPB offers superior long-term availability with 6187 units in stock compared to the obsolete original part.

Frequently Asked Questions (FAQ)

Q: Can the LM61CIZ/NOPB be used as a direct replacement for the LM61CIZ?

A: Yes. The LM61CIZ/NOPB is electrically and mechanically identical to the LM61CIZ. All functional parameters, including temperature range, output resolution, supply voltage, accuracy, and shutdown mode, are equivalent. The primary differences are product status (active vs. obsolete) and RoHS compliance (ROHS3 vs. non-compliant).

Q: Are there any PCB layout or circuit design changes required when substituting the LM61CIZ with the LM61CIZ/NOPB?

A: No. Both parts use the identical TO-92-3 through-hole package. Pin configuration, electrical characteristics, and operating parameters are unchanged. Direct pin-for-pin substitution is possible without circuit modifications.

Q: What is the significance of the "/NOPB" suffix in the LM61CIZ/NOPB part number?

A: The "/NOPB" suffix indicates "No Plumbum" (lead-free) packaging, reflecting RoHS3 compliance. This designation confirms the part meets current environmental regulations and is suitable for applications requiring lead-free components.

Q: Why is the original LM61CIZ classified as obsolete?

A: The LM61CIZ is obsolete due to its RoHS non-compliant status and the industry-wide transition to lead-free components. The LM61CIZ/NOPB represents the current active equivalent that meets modern regulatory requirements.

Q: Are the supply voltage and temperature operating ranges identical between the two parts?

A: Yes. Both the LM61CIZ and LM61CIZ/NOPB operate across 2.7V to 10V supply voltage and -30°C to 100°C temperature range with identical 10mV/°C resolution and ±3°C to ±4°C accuracy specifications.

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