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Texas Instruments LMC7221AIMX
- Part No.:
- LMC7221AIMX
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7221AIMX.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,177
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Product details
Overview
LMC7221AIMX 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 4 μs propagation delay at 5V - deployed in battery-powered mixed-voltage systems for precision level detection and sensor interfacing.
For engineers reviewing the LMC7221AIMX datasheet, LMC7221AIMX pinout, LMC7221AIMX application, or LMC7221AIMX equivalent, this page delivers verified package mapping (8-pin SOIC), confirmed operating range (−40°C to +85°C), validated rail-to-rail input behavior down to 2.7V, and real-world design implications of its open-drain output in multi-supply domains.
Technical Context
The LMC7221AIMX implements a CMOS input stage enabling rail-to-rail common-mode input range extending 200 mV beyond V− and up to V+, ensuring reliable operation near supply rails without external biasing. Its open-drain output stage supports pull-up to voltages as high as 15V - independent of its own 2.7–15V supply - enabling direct interface across 3.3V/5V/15V logic 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 sensor front-ends and long-time-constant timing circuits. The device is characterized across three supply voltages (2.7V, 5V, 15V) with guaranteed performance over industrial temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 15V - enables use across single-cell Li-ion, 3.3V logic, and 12V industrial rails without level-shifting. |
| Input Offset Voltage (max) | 5 mV - ensures accurate threshold detection in low-voltage sensor monitoring (e.g., battery voltage supervision). |
| Supply Current (typ @ 5V) | 7 μA - extends battery life in portable devices; allows >1-year operation on coin cells in duty-cycled applications. |
| Propagation Delay (tPHL/tPLH) | 4 μs @ 2.7V, 100 mV overdrive - sufficient for slow-speed control loops, power sequencing, and alarm triggering. |
| Input Common-Mode Range | V− −0.2V to V+ +0.2V - permits direct sensing of signals at or beyond supply rails (e.g., VCC monitoring, zero-crossing detection). |
| Output Type | Open-drain - allows flexible pull-up to any compatible voltage (≤15V), enabling mixed-voltage I/O without translators. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin-ambient environments. |
Pinout & Package
LMC7221AIMX is packaged in an 8-pin SOIC (Package Drawing D, JEDEC MS-012), 5.0 mm × 6.2 mm footprint, 1.75 mm height, RoHS-compliant with Sn lead finish and MSL Level-1 rating.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | High-impedance node accepting analog signals up to V+ +0.2V; requires guarding in high-Z layouts. |
| 2 | Non-Inverting Input (+) | Same rail-to-rail common-mode capability as Pin 1; differential input voltage limited to ±(V+ +0.3V). |
| 3 | Ground (V−) | Reference return for both inputs and output stage; must be low-impedance for stable comparator operation. |
| 4 | Output | Open-drain NMOS drain - sinks current only; requires external pull-up resistor to define logic-high level. |
| 5 | NC | No internal connection; left unconnected per TI design - not usable as thermal pad or auxiliary function. |
| 6 | V+ | Positive supply pin; accepts 2.7–15V DC; decoupling capacitor (0.1 μF) recommended within 5 mm. |
| 7 | NC | No internal connection; electrically isolated - must remain floating per datasheet guidance. |
| 8 | NC | No internal connection; no bonding wire attached - PCB pad may be omitted or grounded for thermal relief only. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Operates with inputs from V− −0.2V to V+ +0.2V - eliminates need for input resistive dividers in VCC-sense or current-shunt applications. |
| Ultra-low input bias current | 0.04 pA typical - preserves signal integrity when interfacing with high-output-impedance sensors (e.g., pH electrodes, piezoresistive elements). |
| Micropower operation | 7 μA supply current at 5V - enables always-on monitoring in energy-constrained IoT endpoints without compromising response time. |
| Open-drain output flexibility | Sinks up to 30 mA while allowing pull-up to 15V - supports direct interface to 1.8V/3.3V/5V/12V logic families without level translators. |
| Guaranteed specs at 2.7V | Full electrical characterization at 2.7V - ensures reliable operation in aging Li-ion batteries or low-dropout regulator outputs. |
Applications
| Battery Voltage Monitoring | Low-Power Sensor Interface |
|---|---|
Use Scenario: Monitoring Li-ion cell voltage during discharge to trigger low-battery warning before cutoff. IC Role / Device Role / Timing Role: Comparator compares cell voltage against 3.0V reference; output drives microcontroller interrupt line. Use Value: Rail-to-rail input enables direct sensing without attenuation; 7 μA quiescent current avoids accelerating battery drain. | Use Scenario: Detecting motion via piezoelectric sensor output exceeding threshold in wearable activity tracker. IC Role / Device Role / Timing Role: Single-ended comparator converts analog sensor pulse into clean digital edge for MCU wake-up. Use Value: 0.04 pA input bias current prevents signal loading; open-drain output pulls up to MCU's 1.8V I/O rail. |
| PCMCIA Card Power Sequencing | Alarm Circuit Threshold Detection |
Use Scenario: Enabling 3.3V and 5V supplies in correct order during PCMCIA card insertion using voltage ramp monitoring. IC Role / Device Role / Timing Role: Two LMC7221AIMX units monitor rising 3.3V and 5V rails; AND-gated outputs enable downstream logic. Use Value: 5 mV offset ensures precise sequencing margin; SOIC package fits tight PCMCIA Type III height constraint (≤1.43 mm). | Use Scenario: Triggering fire alarm siren when smoke detector output exceeds 2.5V threshold under ambient light conditions. IC Role / Device Role / Timing Role: Comparator compares photodiode amplifier output to adjustable reference; output drives latching relay driver. Use Value: −40°C to +85°C rating ensures reliability in unconditioned ceiling mounts; 1.0 μV/°C TCVOS minimizes drift-induced false alarms. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC7221AIM5/NOPB | Identical electrical specs; 5-pin SOT-23 package (3.05 × 3.00 mm, 1.45 mm height) vs. SOIC. | Better suited for ultra-compact PCBs where board area or height is constrained (e.g., wearables, thin modules). | Select LMC7221AIM5/NOPB when footprint or profile is critical; LMC7221AIMX preferred for manual assembly or thermal mass requirements. |
| TLV3701IDBVR | Lower supply current (1.8 μA), but 10 mV max offset and no guaranteed 2.7V operation; push-pull output. | Not suitable for mixed-voltage pull-up or rail-to-rail input below 0.2V - requires external biasing for VCC monitoring. | Choose TLV3701IDBVR only if ultra-low power dominates and open-drain/mixed-voltage capability is unnecessary. |
Compared with LMC7221AIM5/NOPB, LMC7221AIMX offers superior thermal dissipation and hand-solderability; versus TLV3701IDBVR, it provides guaranteed rail-to-rail input and open-drain flexibility essential for industrial voltage supervision and multi-rail systems.
Availability
LMC7221AIMX is available at Aetrix Electronics and suitable for battery voltage supervision, low-power sensor interface, PCMCIA power sequencing, and industrial alarm circuitry requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMC7221AIMX 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 deep expertise in low-power design and industrial-grade reliability.
The LMC7221AIMX belongs to TI's Tiny Comparator family - engineered specifically for space-constrained, battery-operated, and mixed-voltage applications where rail-to-rail input, micropower consumption, and open-drain interoperability are mandatory.
FAQ
What is the maximum allowable supply voltage for the LMC7221AIMX?
The LMC7221AIMX has an absolute maximum supply voltage (V+ – V−) of 16V. Its recommended operating range is 2.7V to 15V DC. Exceeding 16V risks permanent damage to the internal CMOS structure. For reliable long-term operation, maintain supply within the 2.7–15V range specified in the Electrical Characteristics tables, especially when operating at temperature extremes.
Does the LMC7221AIMX support rail-to-rail input at 2.7V supply?
Yes, the LMC7221AIMX supports rail-to-rail input operation at 2.7V supply - its input common-mode range extends from V− −0.2V to V+ +0.2V, confirmed in the 2.7V Electrical Characteristics table. This enables direct sensing of signals at ground or near VCC without external biasing, critical for low-voltage battery monitoring and zero-crossing detection in single-supply systems.
Can the LMC7221AIMX drive an LED directly?
The LMC7221AIMX can sink up to 30 mA (absolute max) and typically drives small, high-efficiency LEDs in indicator circuits when used with appropriate current-limiting resistors. Its open-drain output allows pull-up to voltages higher than its supply - e.g., a 5V LED can be driven even when LMC7221AIMX operates at 2.7V - but sustained LED current should stay ≤10 mA to avoid thermal stress and ensure long-term reliability.
What is the purpose of the NC pins on the LMC7221AIMX SOIC package?
Pins 5, 7, and 8 on the LMC7221AIMX (SOIC-8) are No Connect (NC) - they have no internal bond wires or circuit connections. TI explicitly states these pins must remain unconnected in layout. They are not thermal pads, test points, or reserved functions. Leaving them floating is required; grounding or routing them may cause parasitic coupling or violate qualification testing conditions.
How does the open-drain output of the LMC7221AIMX differ from a push-pull output?
The LMC7221AIMX open-drain output contains only an NMOS transistor that sinks current to ground - it cannot source current. A pull-up resistor is mandatory to define the logic-high state, and that resistor may connect to any compatible voltage (≤15V), enabling interoperability across voltage domains. In contrast, a push-pull output (e.g., LMC7211) actively drives both high and low, limiting interface to its own supply voltage.
LMC7221AIMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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
LMC7221AIMX FAQ
1.How can I place an order for LMC7221AIMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7221AIMX 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 LMC7221AIMX reliable?
The price and inventory of LMC7221AIMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7221AIMX is usually 5 days.
3.What payment methods are accepted for LMC7221AIMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7221AIMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7221AIMX?
LMC7221AIMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7221AIMX 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 LMC7221AIMX?
For technical support, including LMC7221AIMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7221AIMX requirements.
6.How does Aetrix verify that LMC7221AIMX is sourced from the original manufacturer or authorized distributors?
All LMC7221AIMX 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 LMC7221AIMX meets industry standards.
7.What is the process for return or replacement of LMC7221AIMX?
All LMC7221AIMX units undergo pre-shipment inspection (PSI). If there is an issue with LMC7221AIMX, 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 LMC7221AIMX part is unused and in its original packaging.
Return procedure for LMC7221AIMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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