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Texas Instruments LM111FKB
- Part No.:
- LM111FKB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 20-CLCC
- Datasheet:
-
LM111FKB.pdf
- Description:
- DIFFERENTIAL COMPARATOR WITH STR
- Quantity:
- Payment:
- Shipping:
Inventory:1,956
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Product details
Overview
LM111FKB from Texas Instruments is a high-speed differential voltage comparator in 20-pin LCCC package, featuring 165 ns response time, ±30 V differential input range, and open-collector/emitter outputs capable of switching up to 50 V at 50 mA - used in precision zero-crossing detection, oscillator timing, and relay/solenoid control circuits.
For engineers reviewing the LM111FKB datasheet, LM111FKB pinout, LM111FKB application, or LM111FKB equivalent, this page delivers verified electrical specs, thermal metrics for the FK package, strobe and balance functionality details, and real-world implementation guidance for industrial and aerospace-grade designs requiring –55°C to +125°C operation.
Technical Context
The LM111FKB uses a PNP input stage enabling rail-to-rail common-mode operation down to VCC–, followed by high-gain amplification and an isolated-emitter NPN output stage. Its dual-output structure (COL OUT and EMIT OUT) allows flexible load referencing to ground, VCC+, or VCC–.
Strobe (BAL/STRB) enables external current-driven blanking (–3 mA to –5 mA), while BALANCE supports offset trimming via external resistor network. Input bias current is ≤300 nA max, and input offset voltage is ≤10 mV over full temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response time | 165 ns high-to-low; enables sub-6 MHz comparator-based oscillators and fast edge detection |
| Supply voltage range | ±15 V or single 5 V; supports legacy op-amp rails and modern logic-level systems |
| Differential input voltage | ±30 V; permits direct comparison of high-voltage sensor signals without attenuation |
| Output drive capability | 50 V / 50 mA on COL OUT; drives relays, lamps, and MOSFET gates directly |
| Operating temperature | –55°C to +125°C; qualified for military, aerospace, and extended-temperature industrial use |
| Input bias current | ≤300 nA max; minimizes loading error in high-impedance reference or transducer circuits |
| Input offset voltage | ≤10 mV over full temp range; ensures stable threshold accuracy in precision level-shift applications |
Pinout & Package
LM111FKB is housed in an 8.89 mm × 8.89 mm ceramic LCCC (Leadless Chip Carrier) package with 20 leads, designed for hermetic sealing and high-reliability mounting in demanding environments. The package includes internal thermal path to case (RθJC(top) = 5.61°C/W) and supports 260°C reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (EMIT OUT) | Emitter output terminal | Provides low-side switching node referenced to VCC–; used for grounded-load configurations |
| 2 (IN+) | Noninverting input | Accepts signal to be compared against IN–; supports common-mode down to VCC– |
| 3 (IN–) | Inverting input | Reference or feedback input; differential comparison determines output state |
| 4 (VCC–) | Negative supply pin | Return path for dual-supply operation; also serves as emitter reference for EMIT OUT |
| 5 (BALANCE) | Offset null adjustment | Connects to external potentiometer for manual input offset compensation |
| 6 (BAL/STRB) | Strobe control input | Current-sink input (–3 mA to –5 mA) that forces output into high-Z state regardless of inputs |
| 7 (COL OUT) | Collector output terminal | Open-collector output; requires external pullup; drives loads referenced to VCC+, ground, or VCC– |
| 8 (VCC+) | Positive supply pin | Primary power rail; supports up to +18 V in single-supply mode |
| 9–14, 16, 18–20 | No connect (NC) | No internal connection; must remain unconnected per datasheet |
| 15 | BAL/STRB (duplicate) | Same function as Pin 6; electrically tied internally in FK package |
| 17 | COL OUT (duplicate) | Same function as Pin 7; electrically tied internally in FK package |
| 12 | BALANCE (duplicate) | Same function as Pin 5; electrically tied internally in FK package |
Key Features
| Feature | Design Value |
|---|---|
| Strobe-enabled blanking | External current-driven disable (–3 mA to –5 mA) prevents false triggering during system reset or calibration |
| Isolated emitter output | EMIT OUT pin references independently to VCC–, enabling floating-load switching without level-shifting circuitry |
| Wire-OR compatible output | COL OUT supports wired-AND logic with other open-collector comparators for priority interrupt or fault-bus architectures |
| Rail-to-rail input common-mode | Operates with inputs as low as VCC– and as high as VCC+ – 1.5 V, eliminating need for input clamping diodes |
| Hermetic LCCC packaging | FK variant meets MIL-PRF-38535 requirements for high-reliability aerospace and defense applications |
Applications
| Zero-Crossing Detection | Oscillator Timing |
|---|---|
Use Scenario: Detecting AC line voltage polarity transitions in motor control or power factor correction circuits. IC Role / Device Role / Timing Role: Voltage comparator comparing sinusoidal input to ground reference, generating clean TTL-compatible zero-cross pulses. Use Value: 165 ns propagation delay ensures sub-microsecond timing resolution; dual outputs allow simultaneous trigger and enable signals. |
Use Scenario: Building free-running multivibrators or crystal-controlled oscillators in frequency synthesis modules. IC Role / Device Role / Timing Role: Core timing element in hysteresis-based relaxation oscillators, leveraging strobe and balance pins for duty-cycle tuning. Use Value: ±30 V differential input range accommodates high-Q crystal feedback networks; open-collector output interfaces directly with 74HC logic. |
| Relay/Solenoid Control | High-Voltage Level Shifting |
Use Scenario: Driving 24 VDC or 48 VDC industrial relays and solenoids in PLC I/O modules. IC Role / Device Role / Timing Role: High-side or low-side switch controller using COL OUT to activate transistor gate or relay coil. Use Value: 50 V / 50 mA output rating eliminates need for external driver stages; strobe input synchronizes actuation with system clock. |
Use Scenario: Translating 3.3 V microcontroller GPIO signals to 12 V or 24 V control domains in automotive body electronics. IC Role / Device Role / Timing Role: Bidirectional level translator with independent VCC+ and VCC– supplies defining input/output logic thresholds. Use Value: Input bias current ≤300 nA prevents loading of weak MCU outputs; wide supply range supports mixed-voltage board architecture. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM211JG | CDIP-8 package; rated for –40°C to +85°C only; no BAL/STRB duplication; lower thermal resistance (RθJC = 14.5°C/W) | Suitable for commercial/industrial PCBs where hermeticity and extended temperature are not required | Select when cost, board space, or standard through-hole assembly outweigh military-grade reliability needs |
| LM311PS | SO-8 package; rated 0°C to +70°C; 40 V max collector output; higher input offset voltage (7.5 mV typ) | Targeted at consumer electronics and white goods where ambient temperature stays within limits | Choose for high-volume, cost-sensitive applications with simplified thermal management and no strobe requirement |
Compared with LM211JG and LM311PS, LM111FKB provides the widest operating temperature (–55°C to +125°C), highest output voltage tolerance (50 V), and dual-pin redundancy for BAL/STRB and COL OUT - making it uniquely suited for mission-critical aerospace, defense, and downhole instrumentation systems.
Availability
LM111FKB is available at Aetrix Electronics and suitable for precision timing, high-reliability relay control, and aerospace-grade zero-crossing detection requiring stable component supply across extended temperature and long lifecycle programs.
Supply support for LM111FKB 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 performance.
The LM111 series was designed specifically for high-speed, high-voltage comparator applications in military, aerospace, and extended-temperature industrial systems - prioritizing input precision, output flexibility, and environmental robustness.
FAQ
What is the maximum supply voltage rating for LM111FKB?
The LM111FKB supports a maximum supply voltage of ±18 V (VCC+ ≤ +18 V, VCC– ≥ –18 V), with absolute maximum differential supply (VCC+ – VCC–) limited to 36 V. Exceeding these ratings risks permanent damage, per TI's Absolute Maximum Ratings table in SLCS007K.
How does the BAL/STRB pin function in LM111FKB?
In LM111FKB, the BAL/STRB pin (Pins 6 and 15) serves dual purpose: as a strobe input (sinking –3 mA to –5 mA to force high-impedance output) and as a balance terminal for offset nulling. It must never be shorted to ground - current drive is mandatory for reliable blanking behavior.
Can LM111FKB drive a 24 V relay directly?
Yes - LM111FKB's COL OUT pin is rated for 50 V at 50 mA, fully supporting direct drive of 24 V DC relays with appropriate pullup configuration. Use a 1–2.2 kΩ pullup to VCC+ and verify relay coil current remains ≤50 mA; EMIT OUT may alternatively sink relay current to VCC–.
What is the thermal resistance of the LM111FKB LCCC package?
The LM111FKB LCCC package has a junction-to-case (top) thermal resistance RθJC(top) of 5.61°C/W, significantly lower than SOIC or PDIP variants. This enables efficient heat transfer in hermetically sealed modules and high-power-density designs where thermal management is critical.
Does LM111FKB support single-supply operation?
Yes - LM111FKB operates from a single 5 V supply (VCC+ = 5 V, VCC– = 0 V), with input common-mode range extending from 0.5 V to 3.5 V and output compatible with TTL/MOS logic. Full performance specifications apply across its entire recommended supply range of 3.5 V to 30 V.
LM111FKB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 20-CLCC
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- Differential
- Number of Elements:
- 1
- Output Type:
- Open-Collector, Open-Emitter
- Voltage - Supply, Single/Dual (±):
- 3.5V ~ 30V, ±1.75V ~ 15V
- :
- 3mV @ ±15V
- Voltage - Input Offset (Max):
- 0.1µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 5mA, 6mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 165ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 20-LCCC (8.89x8.89)
LM111FKB FAQ
1.How can I place an order for LM111FKB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM111FKB 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 LM111FKB reliable?
The price and inventory of LM111FKB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM111FKB is usually 5 days.
3.What payment methods are accepted for LM111FKB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM111FKB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM111FKB?
LM111FKB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM111FKB 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 LM111FKB?
For technical support, including LM111FKB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM111FKB requirements.
6.How does Aetrix verify that LM111FKB is sourced from the original manufacturer or authorized distributors?
All LM111FKB 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 LM111FKB meets industry standards.
7.What is the process for return or replacement of LM111FKB?
All LM111FKB units undergo pre-shipment inspection (PSI). If there is an issue with LM111FKB, 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 LM111FKB part is unused and in its original packaging.
Return procedure for LM111FKB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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