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Texas Instruments LMC7221BIM
- Part No.:
- LMC7221BIM
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LMC7221BIM.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,690
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Product details
Overview
LMC7221BIM 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 mixed-voltage sensing and low-power monitoring circuits.
For engineers reviewing the LMC7221BIM datasheet, LMC7221BIM pinout, LMC7221BIM application, or LMC7221BIM equivalent, this page delivers verified package mapping (SOIC-8), confirmed electrical specs (VOS ≤15 mV, IS ≤14 μA, tPHL ≤10 μs), thermal rating (−40°C to +85°C), and real-world design context for space-constrained, low-quiescent-current systems.
Technical Context
The LMC7221BIM implements a CMOS input stage enabling rail-to-rail common-mode input range extending beyond V− by 0.2 V and up to V+ +0.3 V, ensuring reliable signal detection near supply rails. Its open-drain output supports pull-up to voltages independent of V+, enabling level translation across 3.3V/5V/15V domains.
It features ultra-low input bias current (0.04 pA typ) and high input impedance (>1012 Ω), making it suitable for high-impedance sensor interfaces and RC timing networks. The device is characterized across 2.7V, 5V, and 15V supplies with guaranteed performance over −40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.7V to 15V - supports single-supply operation across battery-depleted to fully charged states in portable systems. |
| Input Offset Voltage (max) | 15 mV - ensures accurate threshold detection in precision voltage monitoring applications like power supply supervision. |
| Supply Current (max) | 14 μA at 5V - enables multi-year battery life in always-on sensor nodes and low-duty-cycle wake-up circuits. |
| Propagation Delay (tPHL) | 10 μs at 10 mV overdrive - sufficient for slow-to-moderate speed event detection (e.g., brownout, battery low warning). |
| Input Common-Mode Range | V− −0.2 V to V+ +0.3 V - allows direct sensing of signals at or slightly beyond supply rails without external level-shifting circuitry. |
| Output Type | Open-drain - permits flexible logic-level interfacing via external pull-up to any voltage ≤15V, including mixed-voltage microcontroller I/O. |
| Operating Temperature | −40°C to +85°C - qualified for industrial and extended commercial environments without derating. |
Pinout & Package
LMC7221BIM is housed in an 8-pin SOIC package (Package Drawing D, JEDEC MS-012AA), 3.91 mm × 4.90 mm footprint, 1.75 mm height, RoHS-compliant, with moisture sensitivity level (MSL) Level-1 (260°C peak reflow).
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Inverting Input (−) | High-impedance CMOS node accepting analog signals from sensors or dividers; rail-to-rail capable. |
| 2 | Non-Inverting Input (+) | High-impedance CMOS node for reference or signal input; identical voltage range and leakage as Pin 1. |
| 3 | Ground (V−) | Primary return path for supply and inputs; must be low-impedance to minimize noise coupling into high-Z inputs. |
| 4 | Output | Open-drain NMOS drain - sinks current only; requires external pull-up resistor to define logic-high level and voltage domain. |
| 5 | NC | No internal connection - left unconnected per TI specification; not usable for routing or thermal relief. |
| 6 | V+ | Positive supply rail (2.7V–15V); powers internal circuitry and sets upper bound of input common-mode range. |
| 7 | NC | No internal connection - electrically isolated; PCB pad may be omitted or used for mechanical anchoring only. |
| 8 | NC | No internal connection - unused pin; no electrical function; avoid routing signals or power to this terminal. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Extends 0.2 V below V− and 0.3 V above V+, enabling direct monitoring of supply rails and ground-referenced signals without attenuation. |
| 7 μA typical supply current at 5V | Reduces system-level quiescent power by >90% vs. standard comparators, critical for coin-cell or energy-harvesting applications. |
| 0.04 pA typical input bias current | Minimizes voltage error in high-impedance divider networks (e.g., >10 MΩ), preserving accuracy in battery voltage scaling circuits. |
| Open-drain output with 15V absolute max rating | Allows interface to logic families operating at different voltages (e.g., 3.3V MCU I/O) using a single external pull-up resistor. |
| Guaranteed operation at 2.7V | Supports full functionality down to end-of-life Li-ion or alkaline battery voltages, eliminating need for boost regulators in low-VDD designs. |
Applications
| Battery Voltage Monitor | Mixed-Voltage Logic Interface |
|---|---|
|
Use Scenario: Detecting when a 3.7V Li-ion battery drops below 3.0V to trigger low-battery alert in handheld devices. IC Role / Device Role / Timing Role: Comparator compares scaled battery voltage against 1.225V reference; open-drain output drives 3.3V GPIO interrupt line. Use Value: Eliminates need for separate level shifter; rail-to-rail input accepts full battery range without external op-amp buffering. |
Use Scenario: Interfacing a 5V analog sensor output to a 3.3V microcontroller ADC reference or digital input. IC Role / Device Role / Timing Role: LMC7221BIM compares sensor output to threshold; open-drain output pulled to 3.3V provides compatible logic levels. Use Value: Avoids dedicated level translators; low supply current preserves system efficiency while supporting dual-voltage domains. |
| PCMCIA Card Power Supervision | Low-Power Sensor Wake-Up Circuit |
|
Use Scenario: Monitoring +3.3V and +5V rails in PCMCIA Type III cards to detect undervoltage conditions before host enumeration. IC Role / Device Role / Timing Role: Dual-rail monitoring via two LMC7221BIM units; compact SOIC-8 footprint fits tight card-edge layouts. Use Value: 1.43 mm max height meets PCMCIA Type III mechanical envelope; 14 μA max supply current avoids loading auxiliary supplies. |
Use Scenario: Waking a deep-sleep MCU when ambient light exceeds threshold, using photodiode + transimpedance amplifier. IC Role / Device Role / Timing Role: High-impedance input senses amplifier output; open-drain output asserts MCU interrupt with minimal leakage. Use Value: 0.04 pA input bias prevents signal corruption from high-value feedback resistors; rail-to-rail input accommodates near-ground signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMC7221AIM/NOPB | Lower 5 mV max input offset voltage (vs. 15 mV for LMC7221BIM); otherwise identical SOIC-8 package, specs, and pinout. | Suitable where tighter threshold accuracy is required (e.g., precision bandgap monitoring), but higher cost and lower availability. | Select LMC7221AIM/NOPB only if <5 mV VOS is mandatory; LMC7221BIM offers better cost/performance balance for general-purpose supervision. |
| TLV3701CDR | Higher 17 μA max supply current, 1.2 μs propagation delay, rail-to-rail output (push-pull), same SOIC-8 footprint. | Better for faster response or when active-high drive is needed; unsuitable for open-drain bus-wire OR-ing or mixed-voltage pull-up. | Choose TLV3701CDR only if push-pull output and sub-μs speed are required; LMC7221BIM remains optimal for ultra-low IQ and open-drain flexibility. |
Compared with LMC7221AIM/NOPB, LMC7221BIM trades 10 mV higher offset for broader availability and lower unit cost; versus TLV3701CDR, it sacrifices speed and push-pull drive to achieve 2.5× lower quiescent current and true open-drain interoperability across voltage domains.
Availability
LMC7221BIM is available at Aetrix Electronics and suitable for battery voltage monitoring, mixed-voltage logic interfacing, and PCMCIA power supervision requiring stable component supply, long-lifecycle support, and RoHS-compliant packaging.
Supply support for LMC7221BIM 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 LMC7221BIM belongs to TI's precision micropower comparator family, designed specifically for space-constrained, battery-operated systems requiring rail-to-rail input, open-drain output, and guaranteed operation down to 2.7V.
FAQ
What is the maximum supply voltage rating for the LMC7221BIM?
The LMC7221BIM has an absolute maximum supply voltage (V+ – V−) of 16V, with recommended operating range from 2.7V to 15V. Exceeding 16V risks permanent damage. At 15V operation, input common-mode range extends to 15.3V (CMRR >55 dB), and output can safely sink current with pull-up to ≤15V.
Does the LMC7221BIM support rail-to-rail input, and what does that mean for practical design?
Yes - the LMC7221BIM input common-mode range extends from V− −0.2 V to V+ +0.3 V. This means it can accurately compare signals at or slightly beyond the supply rails, enabling direct monitoring of VCC or ground-referenced sensors without external level-shifting resistors or op-amps.
Can the LMC7221BIM drive an LED directly, and what are the limitations?
The LMC7221BIM open-drain output can sink up to 5 mA (typical) at VOL ≤0.4 V with 5V supply, sufficient for low-current indicator LEDs. However, it cannot source current - the LED must be anode-connected to VCC (or pull-up voltage) and cathode to the output pin. Do not exceed 30 mA sink current to maintain reliability.
What is the significance of the 'B' grade in LMC7221BIM, and how does it differ from 'A' grade?
The 'B' suffix denotes the 15 mV maximum input offset voltage grade (vs. 5 mV for 'A' grade). All other specifications - supply current, propagation delay, temperature range, and package - are identical. The 'B' grade offers cost and availability advantages where ±7.5 mV threshold tolerance is acceptable.
Is the LMC7221BIM pin-compatible with other comparators in SOIC-8 packages, such as the LM393?
No - the LMC7221BIM uses a non-standard SOIC-8 pinout: Pins 1–4 are IN−, IN+, GND, OUT; Pins 5, 7, and 8 are NC; Pin 6 is V+. This differs fundamentally from LM393 (dual comparator, Pins 1/2/3/4/5/6 = OUT1/IN1+/IN1−/IN2−/IN2+/OUT2). Direct replacement requires PCB redesign.
LMC7221BIM 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
- :
- 15mV @ 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
LMC7221BIM FAQ
1.How can I place an order for LMC7221BIM through Aetrix?
Please submit a Request for Quotation (RFQ) for LMC7221BIM 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 LMC7221BIM reliable?
The price and inventory of LMC7221BIM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMC7221BIM is usually 5 days.
3.What payment methods are accepted for LMC7221BIM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMC7221BIM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMC7221BIM?
LMC7221BIM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMC7221BIM 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 LMC7221BIM?
For technical support, including LMC7221BIM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMC7221BIM requirements.
6.How does Aetrix verify that LMC7221BIM is sourced from the original manufacturer or authorized distributors?
All LMC7221BIM 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 LMC7221BIM meets industry standards.
7.What is the process for return or replacement of LMC7221BIM?
All LMC7221BIM units undergo pre-shipment inspection (PSI). If there is an issue with LMC7221BIM, 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 LMC7221BIM part is unused and in its original packaging.
Return procedure for LMC7221BIM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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