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Home > Products > Integrated Circuits (ICs) > Linear > Comparators

Texas Instruments LMC7221AIM

Name: LMC7221AIM
Brand: Texas Instruments
SKU: LMC7221AIM
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: LMC7221AIM

Manufacturer:: Texas Instruments

Category:: Comparators

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: LMC7221AIM.pdf

Description:: IC COMPARATOR 1 GEN PUR 8SOIC

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Product details

Overview

LMC7221AIM from Texas Instruments is a micropower CMOS single comparator with rail-to-rail input, open-drain output, 5 mV max input offset voltage, 7 μA typical supply current at 5V, and operation from 2.7V to 15V - deployed in battery-powered mixed-voltage systems such as PCMCIA cards and sensor interface circuits.

For engineers reviewing the LMC7221AIM datasheet, LMC7221AIM pinout, LMC7221AIM application, or LMC7221AIM equivalent, this page delivers verified electrical specs, package mapping to SOIC-8, confirmed temperature range (−40°C to +85°C), and two validated alternative comparators for low-power open-drain designs.

Technical Context

The LMC7221AIM uses a CMOS input stage enabling rail-to-rail common-mode input range extending 0.2 V beyond both supply rails, ensuring reliable sensing near V_CC or ground. Its open-drain output supports pull-up to voltages up to 15 V independent of V_CC, enabling level translation across domains.

It features ultra-low input bias current (0.04 pA typ) and input offset voltage drift of 1.0 μV/°C, making it suitable for high-impedance timing circuits and precision threshold detection without front-end amplification.

Key Specifications

Parameter	Value and Actual Design Meaning
Supply Voltage Range	2.7 V to 15 V - supports single-supply operation across Li-ion, 3.3 V, and 5 V systems without level-shifting.
Input Offset Voltage (max)	5 mV - ensures accurate threshold detection in low-overdrive applications like battery monitoring.
Supply Current (typ)	7 μA at 5 V - extends runtime in coin-cell or energy-harvesting applications.
Input Common-Mode Range	V₋ − 0.2 V to V₊ + 0.2 V - enables direct sensing of signals at supply rails, e.g., V_CC monitoring.
Output Type	Open-drain - allows external pull-up to higher/lower voltage than V_CC, supporting mixed-voltage logic interfacing.
Propagation Delay (t_PHL)	4 μs at 2.7 V, 100 mV overdrive - sufficient for slow-control loops and status monitoring, not high-speed signal conditioning.
Operating Temperature	−40°C to +85°C - qualified for industrial and portable consumer environments.

Pinout & Package

LMC7221AIM is packaged in an 8-pin SOIC (Package Drawing D, JEDEC MS-012), 3.9 mm × 4.9 mm body, 1.75 mm height, RoHS-compliant with Sn finish and MSL Level-1 rating.

Pin/Terminal	Circuit Role	Design Meaning
1	Inverting Input (−)	Accepts analog input referenced to comparator threshold; high-impedance node (0.04 pA bias).
2	Non-Inverting Input (+)	Accepts reference or signal input; rail-to-rail common-mode range enables direct connection to V_CC or GND.
3	Ground (V−)	Reference return for single-supply operation; also serves as negative rail in split-supply configurations.
4	Output	Open-drain NMOS drain - requires external pull-up resistor; sinks up to 30 mA, withstands 15 V on output.
5	NC	No internal connection - left unconnected per TI design; not used for thermal or electrical purposes.
6	V+	Positive supply pin - accepts 2.7 V to 15 V; PSRR of 80 dB minimizes supply noise coupling to output.
7	NC	No internal connection - electrically isolated; no routing or grounding required.
8	NC	No internal connection - unused pin; maintains SOIC-8 mechanical compatibility with dual variants.

Key Features

Feature	Design Value
Rail-to-rail input range	Extends 0.2 V beyond V− and V+ - eliminates need for input voltage dividers in supply-monitoring circuits.
7 μA supply current (typ)	Reduces quiescent power to ~35 μW at 5 V - critical for always-on battery-backed comparators.
0.04 pA input bias current	Enables use with >10 MΩ source impedances - supports direct thermistor or photodiode interfacing.
Open-drain output with 15 V tolerance	Allows pull-up to separate logic rail (e.g., 3.3 V MCU I/O) while powered from 5 V - simplifies mixed-voltage board design.
−40°C to +85°C operating range	Validated performance across industrial ambient conditions - no derating required within spec limits.

Applications

Battery Voltage Monitor	Mixed-Voltage Logic Interface
Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles in portable medical devices. IC Role / Device Role / Timing Role: Comparator compares cell voltage against precision reference to trigger low-battery alert. Use Value: Rail-to-rail input allows direct sensing down to 2.7 V cutoff; 7 μA current minimizes impact on battery life.	Use Scenario: Interfacing a 5 V sensor subsystem to a 3.3 V microcontroller GPIO interrupt pin. IC Role / Device Role / Timing Role: Threshold detector converts analog sensor output into logic-level signal for MCU wake-up. Use Value: Open-drain output pulled to 3.3 V enables safe voltage translation without level-shifters or additional ICs.
PCMCIA Card Power Sequencing	Low-Power Sensor Wake-Up Circuit
Use Scenario: Enabling power rails in Type III PCMCIA cards where height is constrained to ≤1.43 mm. IC Role / Device Role / Timing Role: Supervisory comparator validates V_CC before enabling downstream logic. Use Value: SOIC-8 package height (1.75 mm) meets PCMCIA mechanical envelope; 2.7 V min supply supports brown-out detection.	Use Scenario: Detecting motion via piezoelectric sensor output exceeding threshold in wireless IoT node. IC Role / Device Role / Timing Role: Ultra-low-input-current comparator triggers MCU from sleep mode upon event. Use Value: 0.04 pA input bias avoids loading high-Z sensor; 5 mV offset ensures stable trip point under low-signal conditions.

Battery Voltage Monitor

Mixed-Voltage Logic Interface

Use Scenario: Monitoring Li-ion cell voltage during charge/discharge cycles in portable medical devices.

IC Role / Device Role / Timing Role: Comparator compares cell voltage against precision reference to trigger low-battery alert.

Use Value: Rail-to-rail input allows direct sensing down to 2.7 V cutoff; 7 μA current minimizes impact on battery life.

Use Scenario: Interfacing a 5 V sensor subsystem to a 3.3 V microcontroller GPIO interrupt pin.

IC Role / Device Role / Timing Role: Threshold detector converts analog sensor output into logic-level signal for MCU wake-up.

Use Value: Open-drain output pulled to 3.3 V enables safe voltage translation without level-shifters or additional ICs.

PCMCIA Card Power Sequencing

Low-Power Sensor Wake-Up Circuit

Use Scenario: Enabling power rails in Type III PCMCIA cards where height is constrained to ≤1.43 mm.

IC Role / Device Role / Timing Role: Supervisory comparator validates V_CC before enabling downstream logic.

Use Value: SOIC-8 package height (1.75 mm) meets PCMCIA mechanical envelope; 2.7 V min supply supports brown-out detection.

Use Scenario: Detecting motion via piezoelectric sensor output exceeding threshold in wireless IoT node.

IC Role / Device Role / Timing Role: Ultra-low-input-current comparator triggers MCU from sleep mode upon event.

Use Value: 0.04 pA input bias avoids loading high-Z sensor; 5 mV offset ensures stable trip point under low-signal conditions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar open-drain, micropower comparator applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
LMC7221BIMX/NOPB	15 mV max input offset voltage vs. 5 mV for LMC7221AIM - higher initial error, same tempco and supply current.	Suitable for less precision-critical thresholds (e.g., general-purpose alarm), not precision battery cutoff.	Select when cost sensitivity outweighs offset accuracy; identical SOIC-8 footprint and pinout.
TLV3701CDR	Higher supply current (1.8 μA typ), rail-to-rail output (push-pull), 3.5 mV max offset - different output architecture.	Requires same-rail logic interfacing; cannot drive higher-voltage pull-ups without external transistor.	Choose only if push-pull output is mandatory and mixed-voltage translation is unnecessary.

Compared with LMC7221BIMX/NOPB, the LMC7221AIM offers tighter offset for precision sensing; compared with TLV3701CDR, it provides true open-drain flexibility at lower quiescent current but lacks push-pull drive capability.

Availability

LMC7221AIM is available at Aetrix Electronics and suitable for battery voltage monitoring, mixed-voltage logic interfacing, and PCMCIA card power sequencing requiring stable component supply across industrial temperature ranges and long-lifecycle programs.

Supply support for LMC7221AIM includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.

The LMC7221AIM belongs to TI's Tiny Comparator family, engineered specifically for space-constrained, low-power, mixed-voltage applications including portable instrumentation and sensor edge nodes.

FAQ

What is the maximum output sink current for the LMC7221AIM?

The LMC7221AIM can sink up to ±30 mA continuously at its output pin, as specified in Absolute Maximum Ratings. However, sustained operation above 2.5 mA at elevated ambient temperatures may risk exceeding the 150°C junction limit. For robust design, TI recommends limiting steady-state sink current to ≤5 mA unless thermal management is verified. The LMC7221AIM output stage is optimized for low-power logic interfacing, not power switching.

Does the LMC7221AIM support rail-to-rail output swing?

No, the LMC7221AIM does not provide rail-to-rail output swing. It features an open-drain NMOS output that pulls low to within 0.4 V of ground (at 5 mA load) but requires an external pull-up resistor to define the high state. The high-level voltage is determined solely by the pull-up rail - which may be higher or lower than V_CC. This architecture enables voltage translation but does not deliver active high drive like a push-pull output.

Can the LMC7221AIM operate from a 2.7 V supply while maintaining full specifications?

Yes, the LMC7221AIM is fully characterized and ensured over 2.7 V to 15 V. At 2.7 V, it delivers 5 mV max input offset voltage, 7 μA typical supply current, and 4 μs propagation delay (100 mV overdrive). Its rail-to-rail input range extends to V₋ − 0.2 V and V₊ + 0.2 V even at minimum supply, enabling reliable operation in deep-discharge battery scenarios where other comparators fail.

Is the LMC7221AIM pin-compatible with the LMC7211 series?

No, the LMC7221AIM is not pin-compatible with the LMC7211 series. The LMC7221AIM uses an 8-pin SOIC package with pins 1–4 assigned to IN−, IN+, GND, and OUTPUT, while pins 5, 7, and 8 are NC. In contrast, the LMC7211 (push-pull variant) uses the same SOIC-8 package but assigns pin 5 as V_O (output) and pin 6 as V₊, altering the pinout. Board redesign is required for substitution.

What is the input common-mode voltage range of the LMC7221AIM at 5 V supply?

At V₊ = 5 V, the LMC7221AIM input common-mode voltage range is −0.2 V to +5.2 V (ensured), with CMRR > 55 dB across that span. This exceeds the supply rails by 0.2 V on both ends, allowing direct connection of inputs to ground or V_CC without clamping diodes or resistive dividers - a key enabler for supply monitoring and zero-crossing detection in single-supply systems.

LMC7221AIM Specifications

Product attributes: Attribute value

Manufacturer:: Texas Instruments

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Series:: -

Packaging:: Tube

Product Status:: Obsolete

Type:: General Purpose

Number of Elements:: 1

Output Type:: Open-Drain

Voltage - Supply, Single/Dual (±):: 2.7V ~ 15V, ±1.35V ~ 7.5V

:: 5mV @ 5V

Voltage - Input Offset (Max):: 0.04pA @ 5V

Current - Input Bias (Max):: 30mA

Current - Output (Typ):: 14µA

Current - Quiescent (Max):: 75dB CMRR, 80dB PSRR

CMRR, PSRR (Typ):: 10µs

Propagation Delay (Max):: -

Hysteresis:: -40°C ~ 85°C

Operating Temperature:: -

Grade:: -

Qualification:: Surface Mount

:: 8-SOIC

LMC7221AIM FAQ

1.How can I place an order for LMC7221AIM through Aetrix?

Please submit a Request for Quotation (RFQ) for LMC7221AIM on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for LMC7221AIM reliable?

The price and inventory of LMC7221AIM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7221AIM is usually 5 days.

3.What payment methods are accepted for LMC7221AIM?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7221AIM transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for LMC7221AIM?

LMC7221AIM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your LMC7221AIM order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for LMC7221AIM?

For technical support, including LMC7221AIM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7221AIM requirements.

6.How does Aetrix verify that LMC7221AIM is sourced from the original manufacturer or authorized distributors?

All LMC7221AIM products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that LMC7221AIM meets industry standards.

7.What is the process for return or replacement of LMC7221AIM?

All LMC7221AIM units undergo pre-shipment inspection (PSI). If there is an issue with LMC7221AIM, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The LMC7221AIM part is unused and in its original packaging.

Return procedure for LMC7221AIM:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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