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Texas Instruments LMC7221AIM/NOPB
- Part No.:
- LMC7221AIM/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7221AIM/NOPB.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:855
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Product details
Overview
LMC7221AIM/NOPB 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 - used in battery-powered voltage monitoring and sensor interface circuits.
For engineers reviewing the LMC7221AIM/NOPB datasheet, LMC7221AIM/NOPB pinout, LMC7221AIM/NOPB application, or LMC7221AIM/NOPB equivalent, this page delivers verified specifications, package mapping, real-world use cases, and validated alternative options for low-power mixed-voltage system design.
Technical Context
The LMC7221AIM/NOPB implements a CMOS input stage enabling rail-to-rail common-mode input range extending 200 mV beyond V− and up to V+, with guaranteed performance at 2.7V, 5V, and 15V supplies. Its open-drain output supports pull-up to voltages independent of V+, enabling level translation across domains.
Input bias current is 0.04 pA typical, supporting high-impedance sensing without loading; propagation delay is 4 μs (tPHL/tPLH) at 2.7V with 100 mV overdrive, and 10 μs/6 μs at 5V under same conditions. It features 75 dB CMRR and 80 dB PSRR across its operating voltage range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 15V - supports single-supply operation in Li-ion, 3.3V, and 5V systems without level-shifting. |
| Input Offset Voltage (max) | 5 mV - ensures reliable detection of small analog signals above reference thresholds in precision thresholding. |
| Supply Current (typ) | 7 μA at 5V - extends battery life in portable devices such as notebooks and PCMCIA cards. |
| Propagation Delay | 4 μs at 2.7V (100 mV overdrive) - enables fast response in low-voltage power-good detection and zero-crossing circuits. |
| Input Common-Mode Range | V− −0.2V to V+ +0.2V - allows direct sensing of signals near supply rails, e.g., battery voltage monitoring without divider networks. |
| Output Type | Open-drain - permits external pull-up to 15V, enabling interoperability between 5V comparators and 3.3V/1.8V logic families. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and automotive cabin-temperature embedded applications. |
Pinout & Package
LMC7221AIM/NOPB is packaged in an 8-pin SOIC (Package Drawing D), 3.9 mm × 4.9 mm body, 1.75 mm height, RoHS-compliant, with moisture sensitivity level 1 (260°C peak reflow).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | Accepts analog signal to be compared against non-inverting input; rail-to-rail capable down to V− −0.2V. |
| 2 | Non-Inverting Input (+) | Reference or sensor signal input; supports common-mode range up to V+ +0.2V. |
| 3 | Ground (V−) | Negative supply terminal; also serves as reference for single-supply operation (0V ground-referenced). |
| 4 | Output | Open-drain NMOS output - sinks current only; requires external pull-up resistor for logic-high state. |
| 5 | NC | No internal connection - left unconnected per TI datasheet; not to be tied to any potential. |
| 6 | V+ | Positive supply rail; accepts 2.7V–15V; powers internal circuitry and defines upper common-mode limit. |
| 7 | NC | No internal connection - electrically isolated; must remain floating or grounded per layout guidelines. |
| 8 | NC | No internal connection - unused pin; no bonding wire; avoid routing traces to this pad. |
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 voltage scaling in rail-sensing applications like supply monitoring. |
| 7 μA supply current (typ) | Reduces quiescent power in always-on circuits - enables multi-year battery life in remote sensors and security alarms. |
| Open-drain output | Supports mixed-voltage interfacing (e.g., 5V comparator driving 3.3V microcontroller GPIO) via external pull-up to target logic rail. |
| 0.04 pA input bias current (typ) | Minimizes error in high-impedance sensor interfaces (e.g., thermistors, photodiodes) without requiring guard rings or buffer amplifiers. |
| Guaranteed specs at 2.7V | Ensures full functionality at end-of-battery voltage - critical for brown-out detection and low-voltage wake-up in portable electronics. |
Applications
| Battery Voltage Monitor | Mixed-Voltage Logic 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 precision reference; open-drain output drives microcontroller interrupt line. Use Value: Rail-to-rail input enables direct sensing without resistive divider; 7 μA current minimizes load on aging battery. |
Use Scenario: Interfacing a 5V analog sensor subsystem with a 3.3V MCU GPIO that lacks 5V tolerance. IC Role / Device Role / Timing Role: LMC7221AIM/NOPB compares sensor output to threshold and outputs logic-level signal via 3.3V pull-up. Use Value: Open-drain architecture avoids level translators; 4 μs delay at 2.7V ensures timely interrupt assertion. |
| Zero-Crossing Detector | Direct Sensor Thresholding |
Use Scenario: Detecting AC waveform zero crossings in low-power energy metering modules powered from rectified mains. IC Role / Device Role / Timing Role: Comparator senses AC input referenced to virtual ground; output triggers timing-critical sampling windows. Use Value: Input range extending below ground (−0.2V) enables true bipolar sensing with single 5V supply and high-value input resistors. |
Use Scenario: Converting millivolt-level thermopile output into digital alert when temperature exceeds safety threshold. IC Role / Device Role / Timing Role: Compares raw sensor output to stable reference; output drives LED or latching circuit. Use Value: 0.04 pA input bias prevents signal attenuation; 5 mV offset ensures <1°C error in 10 mV/°C thermopile systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC7221AIM5/NOPB | Same die, 5-pin SOT-23 package (DBV); 1.45 mm max height; 3.05 mm × 3.00 mm footprint. | Preferred for ultra-compact PCBs where board area and profile are constrained (e.g., PCMCIA cards, wearables). | Select LMC7221AIM5/NOPB when space is critical; verify thermal derating due to higher θJA (325°C/W vs. 180°C/W). |
| TLV3691IDBVR | Lower supply current (320 nA typ), but 15 mV max offset; rail-to-rail input/output; push-pull output (no external pull-up required). | Better for nano-power systems; unsuitable where open-drain level translation or mixed-voltage pull-up is needed. | Choose TLV3691IDBVR only if ultra-low current dominates design priority and open-drain functionality is unnecessary. |
Compared with LMC7221AIM/NOPB, the SOT-23 variant saves 60% board area but increases thermal resistance; TLV3691IDBVR cuts supply current by >95% but sacrifices open-drain flexibility and doubles offset error - making LMC7221AIM/NOPB optimal for balanced low-power, rail-sensing, and mixed-voltage designs.
Availability
LMC7221AIM/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial sensor nodes, and portable medical devices requiring stable component supply across long production lifecycles.
Supply support for LMC7221AIM/NOPB 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/NOPB belongs to TI's precision analog comparator family, engineered specifically for space-constrained, low-power, single-supply applications including portable electronics, sensor front-ends, and power monitoring systems.
FAQ
What is the maximum supply voltage rating for LMC7221AIM/NOPB?
The absolute maximum supply voltage (V+ − V−) for LMC7221AIM/NOPB is 16V, with recommended operating range from 2.7V to 15V. Exceeding 16V risks permanent damage. The device is fully characterized and specified at 2.7V, 5V, and 15V, ensuring consistent performance across this span. LMC7221AIM/NOPB maintains rail-to-rail input operation and 7 μA typical supply current within these limits.
Does LMC7221AIM/NOPB support true rail-to-rail input operation?
Yes, LMC7221AIM/NOPB supports input common-mode voltage from V− −0.2V to V+ +0.2V - confirmed across all operating voltages (2.7V, 5V, 15V). This enables direct sensing of signals at or slightly beyond supply rails, such as monitoring a 3.3V supply with a 3.3V reference or detecting battery end-of-discharge. LMC7221AIM/NOPB achieves this using a CMOS input stage without PNP or NPN input transistors.
Can LMC7221AIM/NOPB drive an LED directly?
Yes, LMC7221AIM/NOPB can sink up to 5 mA at VOUT = 0.4 V (with 5V supply), sufficient to drive low-current indicator LEDs. Its open-drain output requires an external current-limiting resistor between VCC_LED and the output pin. For example, with a 3.3V LED supply and 1.8V forward voltage, a 300 Ω resistor yields ~5 mA. LMC7221AIM/NOPB's 7 μA quiescent current makes it ideal for intermittent LED signaling in battery-powered systems.
What is the purpose of the NC pins on LMC7221AIM/NOPB?
LMC7221AIM/NOPB has three NC (No Connect) pins: pins 5, 7, and 8 in the SOIC-8 package. These pins have no internal bond wires or circuit connections and must remain unconnected - neither tied to V+, ground, nor routed. TI explicitly states they are unused; connecting them may cause unpredictable behavior or violate ESD protection paths. LMC7221AIM/NOPB functionality is fully implemented using only pins 1–4 and 6.
How does the open-drain output of LMC7221AIM/NOPB enable mixed-voltage system design?
The open-drain output of LMC7221AIM/NOPB allows the output to be pulled up to any voltage ≤15V - independent of its own V+ supply. For instance, LMC7221AIM/NOPB powered at 5V can drive a 3.3V microcontroller input by using a 3.3V pull-up resistor, eliminating level-shifters. This capability stems from its NMOS-only output stage, which sinks current but cannot source it - a key differentiator from push-pull comparators like the LMC7211. LMC7221AIM/NOPB thus simplifies inter-voltage-domain signaling while maintaining low power.
LMC7221AIM/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- 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/NOPB FAQ
1.How can I place an order for LMC7221AIM/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7221AIM/NOPB 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/NOPB reliable?
The price and inventory of LMC7221AIM/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7221AIM/NOPB is usually 5 days.
3.What payment methods are accepted for LMC7221AIM/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7221AIM/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7221AIM/NOPB?
LMC7221AIM/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7221AIM/NOPB 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/NOPB?
For technical support, including LMC7221AIM/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7221AIM/NOPB requirements.
6.How does Aetrix verify that LMC7221AIM/NOPB is sourced from the original manufacturer or authorized distributors?
All LMC7221AIM/NOPB 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/NOPB meets industry standards.
7.What is the process for return or replacement of LMC7221AIM/NOPB?
All LMC7221AIM/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LMC7221AIM/NOPB, 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/NOPB part is unused and in its original packaging.
Return procedure for LMC7221AIM/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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