LMC7221AIM5 Equivalent & Substitute Parts

Part Overview

The LMC7221AIM5 is a general-purpose comparator IC manufactured by Texas Instruments, housed in a SOT-23-5 surface mount package. This single-element open-drain comparator operates across a supply voltage range of 2.7V to 15V (single supply) or ±1.35V to ±7.5V (dual supply), with a maximum input offset voltage of 5mV at 5V and a propagation delay of 10µs maximum.

The LMC7221AIM5 is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain reliability, and support ongoing production or maintenance of systems utilizing this comparator.

Key Parameters

Parameter	LMC7221AIM5
Manufacturer	Texas Instruments
Package / Case	SC-74A, SOT-753 (SOT-23-5)
Type	General Purpose
Number of Elements	1
Output Type	Open-Drain
Voltage - Supply, Single/Dual (±)	2.7V ~ 15V, ±1.35V ~ 7.5V
Voltage - Input Offset (Max)	5mV @ 5V
Current - Input Bias (Max)	0.04pA @ 5V
Current - Output (Typ)	30mA
Current - Quiescent (Max)	14µA
CMRR, PSRR (Typ)	75dB CMRR, 80dB PSRR
Propagation Delay (Max)	10µs
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution of the LMC7221AIM5 is determined by the following critical parameters:

Package Compatibility: All substitute parts must use SOT-23-5 surface mount packaging to ensure direct PCB footprint compatibility.

Electrical Characteristics: Substitute parts must maintain compatibility across the following ranges:

Supply voltage operation within or overlapping the 2.7V to 15V single-supply range
Input offset voltage specifications suitable for the application's precision requirements
Output type (open-drain preferred for direct compatibility)
Propagation delay performance acceptable for the system's timing requirements
Operating temperature range covering -40°C to 85°C minimum

Functional Equivalence: All substitute parts are single-element, general-purpose comparators with open-drain or compatible output configurations.

Compliance: All substitute parts maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating.

Substitute parts are grouped into two categories: parametric equivalents from Texas Instruments (direct replacements with identical electrical specifications) and manufacturer-recommended alternatives from Microchip Technology, onsemi, and STMicroelectronics (functionally equivalent with minor specification variations).

Parameter Comparison

Part Number	Manufacturer	Product Status	Package	Supply Voltage	Input Offset (Max)	Output Type	Quiescent Current (Max)	Propagation Delay (Max)	Operating Temp
LMC7221AIM5	Texas Instruments	Obsolete	SOT-23-5	2.7V ~ 15V	5mV @ 5V	Open-Drain	14µA	10µs	-40°C ~ 85°C
LMC7221AIM5/NOPB	Texas Instruments	Last Time Buy	SOT-23-5	2.7V ~ 15V	5mV @ 5V	Open-Drain	14µA	10µs	-40°C ~ 85°C
LMC7221AIM5X/NOPB	Texas Instruments	Active	SOT-23-5	2.7V ~ 15V	5mV @ 5V	Open-Drain	14µA	10µs	-40°C ~ 85°C
MCP6566RT-E/OT	Microchip Technology	Active	SOT-23-5	1.8V ~ 5.5V	10mV @ 5.5V	CMOS, Open-Drain	130µA	80ns	-40°C ~ 125°C
MIC7221YM5-TR	Microchip Technology	Active	SOT-23-5	2.2V ~ 10V	10mV @ 5V	Open-Drain	25µA	5µs	-40°C ~ 85°C
NCS2200AMUT1G	onsemi	Active	6-UDFN (1.2x1)	0.85V ~ 6V	Not specified	Complementary, Rail-to-Rail	17µA	Not specified	Not specified
TS7221AILT	STMicroelectronics	Active	SOT-23-5	2.7V ~ 10V	7mV @ 5V	Open-Drain	16µA	Not specified	-40°C ~ 85°C
TS7221BILT	STMicroelectronics	Active	SOT-23-5	2.7V ~ 10V	15mV @ 5V	Open-Drain	16µA	Not specified	-40°C ~ 85°C

Engineering Selection Recommendations

Direct Replacement (Parametric Equivalents):

LMC7221AIM5X/NOPB is the primary recommended substitute. This Texas Instruments part maintains identical electrical specifications to the LMC7221AIM5 while offering active product status, ensuring continued availability and manufacturing support. The /NOPB designation indicates lead-free, RoHS3-compliant construction. This part is suitable for direct substitution without design modification.

LMC7221AIM5/NOPB is available as a Last Time Buy option from Texas Instruments. While electrically identical to the original part, this status indicates limited future availability and should be considered only when LMC7221AIM5X/NOPB is unavailable.

Alternative Substitutes (Manufacturer-Recommended):

TS7221AILT (STMicroelectronics) provides functional equivalence with active product status and high inventory availability. This part operates within the 2.7V to 10V supply range, which covers the primary operating window of the LMC7221AIM5. The input offset voltage of 7mV at 5V is slightly higher than the original 5mV specification but remains within acceptable tolerance for most general-purpose comparator applications. Quiescent current (16µA) is comparable to the original (14µA).

MIC7221YM5-TR (Microchip Technology, IttyBitty® series) offers faster propagation delay (5µs versus 10µs) and lower quiescent current (25µA), making it suitable for applications requiring improved speed performance. The supply voltage range (2.2V to 10V) is slightly narrower than the original but covers standard single-supply operating conditions.

MCP6566RT-E/OT (Microchip Technology) provides the fastest propagation delay (80ns) and extended operating temperature range (-40°C to 125°C). However, this part features CMOS output rather than pure open-drain, and the supply voltage range (1.8V to 5.5V) is narrower. This substitute is suitable only when the extended temperature range and faster response are required and the output type change is compatible with the application circuit.

Package Consideration:

NCS2200AMUT1G (onsemi) uses a 6-UDFN package rather than SOT-23-5, requiring PCB layout modification. This part is not recommended for direct substitution without design revision.

Compliance and Certification:

All recommended substitute parts maintain ROHS3 compliance and MSL Level 1 moisture sensitivity rating, consistent with the original LMC7221AIM5. All parts carry EAR99 export classification and are REACH unaffected.

Frequently Asked Questions (FAQ)

Q: Can LMC7221AIM5X/NOPB be used as a direct drop-in replacement for LMC7221AIM5?

A: Yes. LMC7221AIM5X/NOPB is electrically and mechanically identical to LMC7221AIM5, with the same SOT-23-5 package, supply voltage range (2.7V to 15V), input offset voltage (5mV @ 5V), and propagation delay (10µs maximum). The /NOPB designation indicates lead-free, RoHS3-compliant construction. No design changes are required.

Q: What is the difference between LMC7221AIM5/NOPB and LMC7221AIM5X/NOPB?

A: Both parts are electrically identical. The primary difference is product status: LMC7221AIM5/NOPB is Last Time Buy (limited future availability), while LMC7221AIM5X/NOPB is Active (ongoing production and support). For new designs or long-term production, LMC7221AIM5X/NOPB is the preferred choice.

Q: Can TS7221AILT replace LMC7221AIM5 in all applications?

A: TS7221AILT is functionally equivalent for most general-purpose comparator applications. The part maintains SOT-23-5 packaging and open-drain output. However, the supply voltage range is narrower (2.7V to 10V versus 2.7V to 15V), and input offset voltage is slightly higher (7mV @ 5V versus 5mV @ 5V). Verify that your application operates within the 2.7V to 10V range and that the 7mV offset voltage is acceptable for your precision requirements.

Q: Why does MCP6566RT-E/OT have different electrical specifications?

A: MCP6566RT-E/OT is a CMOS comparator with different internal architecture than the LMC7221AIM5. While functionally equivalent as a general-purpose comparator, it features CMOS output (rather than pure open-drain), faster propagation delay (80ns), extended temperature range (-40°C to 125°C), and different supply voltage limits (1.8V to 5.5V). This part is suitable only when these specification differences are compatible with your circuit design.

Q: Is NCS2200AMUT1G a suitable replacement?

A: NCS2200AMUT1G is not recommended as a direct replacement. This part uses a 6-UDFN package instead of SOT-23-5, requiring PCB layout and footprint redesign. Additionally, several electrical parameters are not specified in the datasheet, making compatibility assessment incomplete. Consider this part only if package change is acceptable and full datasheet specifications are reviewed.

Q: What packaging options are available for LMC7221 comparators?

A: The LMC7221 series is available in SOT-23-5 surface mount packaging (SC-74A, SOT-753 designation). All recommended substitutes maintain this package format except NCS2200AMUT1G, which uses 6-UDFN. Ensure your PCB design accommodates SOT-23-5 before selecting a substitute part.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed (LMC7221AIM5/NOPB, LMC7221AIM5X/NOPB, MCP6566RT-E/OT, MIC7221YM5-TR, NCS2200AMUT1G, TS7221AILT, and TS7221BILT) are ROHS3 compliant with MSL Level 1 moisture sensitivity rating, matching the original LMC7221AIM5 compliance status.

Q: Which substitute offers the best inventory availability?

A: TS7221BILT (STMicroelectronics) offers the highest inventory level at 596,100 pieces. TS7221AILT provides 49,550 pieces. Both STMicroelectronics parts maintain active product status with substantial stock levels suitable for production requirements.

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