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Texas Instruments LM111 MD8
- Part No.:
- LM111 MD8
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- Die
- Datasheet:
-
LM111 MD8.pdf
- Description:
- VOLTAGE COMPARATOR 0-DIESALE -55
- Quantity:
- Payment:
- Shipping:
Inventory:3,717
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Product details
Overview
LM111 MD8 from Texas Instruments is a radiation-hardened voltage comparator designed for high-reliability aerospace and defense systems. It delivers 200 nA max input bias current, ±30 V differential input range, 50 mA output sink capability, and operates from single 5V to dual ±15V supplies. Its strobe function, offset null capability, and ground-isolated inputs/outputs enable use in precision threshold detection within satellite power management and missile guidance interfaces.
For engineers reviewing the LM111 MD8 datasheet, LM111 MD8 pinout, LM111 MD8 application, or LM111 MD8 equivalent, this page provides verified radiation-tolerant performance data, MIL-STD-883 qualified operating ranges (–55°C to +125°C), package-specific thermal resistance values, and confirmed alternatives for space-grade comparator replacement.
Technical Context
The LM111 MD8 implements an open-collector NPN output stage with internal balance/strobe control logic, enabling wire-ORed outputs and external hysteresis configuration. Its input stage uses matched transistor pairs to achieve ≤±3 mV input offset voltage and ≤±20 nA offset current over temperature.
It supports wide common-mode input range (±30 V), operates with TTL/DTL/RTL/MOS-compatible output levels, and maintains stable operation under high-dose-rate (50 krad(Si)) and ELDRS-free (100 krad(Si)) radiation exposure per MIL-STD-883 Method 1019.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 200 nA max over –55°C to +125°C - enables high-impedance sensor interface without loading |
| Differential Input Voltage Range | ±30 V - allows direct comparison of signals referenced to non-ground potentials |
| Output Sink Current | 50 mA - drives relays, lamps, or logic inputs without external buffer stages |
| Supply Voltage Range | Single 5V to ±15V - interoperates with both digital logic rails and legacy op-amp supplies |
| Response Time | 300 ns (min) at 5 mV overdrive - supports fast threshold detection in telemetry sampling |
| Operating Temperature | –55°C to +125°C - qualified for extended mission life in orbital and re-entry environments |
| Radiation Tolerance | 50 krad(Si) high-dose-rate & 100 krad(Si) ELDRS-free - meets MIL-PRF-38535 QML-V requirements |
Pinout & Package
LM111 MD8 is supplied in an 8-pin metal can TO-99 package (Package Number LMC0008C), with Pin 4 internally connected to case for shielding and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Balance | Connects to external potentiometer for input offset voltage nulling |
| 2 | Inverting Input (IN−) | High-impedance comparator input; accepts signals up to ±30 V differential |
| 3 | Non-Inverting Input (IN+) | High-impedance comparator input; supports rail-to-rail common-mode range |
| 4 | Case / Ground Reference | Internally bonded to metal can; used for EMI shielding and thermal path |
| 5 | Strobe / Balance | Enables input disabling during critical timing windows; shares terminal with balance |
| 6 | Output (Collector) | Open-collector NPN output; requires external pull-up for logic-level compatibility |
| 7 | V− | Negative supply connection; supports operation down to –15 V |
| 8 | V+ | Positive supply connection; supports operation up to +15 V or +5 V single supply |
Key Features
| Feature | Design Value |
|---|---|
| Strobe capability | Allows synchronous blanking of comparator decision during ADC conversion or data capture windows |
| Offset voltage null | Enables trimming to ≤±1 mV residual offset using external 10-kΩ potentiometer |
| Ground-isolated I/O | Inputs and output can reference independent supply rails - simplifies mixed-voltage system interfacing |
| Wire-OR output topology | Permits multiple comparators to share single interrupt line without logic gates or diodes |
| Wide supply flexibility | Operates identically across 5V logic, ±12V analog, and ±15V instrumentation rails |
Applications
| Spacecraft Power Monitoring | Missile Guidance Threshold Detection |
|---|---|
Use Scenario: Real-time monitoring of solar array bus voltage and battery charge state in LEO satellites. IC Role / Device Role / Timing Role: Voltage comparator detecting overvoltage/undervoltage thresholds to trigger power switching or telemetry alerts. Use Value: Radiation-hardened operation ensures reliable trip-point detection after 100 krad(Si) total ionizing dose exposure. | Use Scenario: Detecting acceleration thresholds during launch phase to initiate stage separation sequencing. IC Role / Device Role / Timing Role: High-speed comparator comparing inertial sensor output against programmable trip level. Use Value: 300 ns response time enables sub-millisecond decision latency under high-g mechanical stress. |
| Avionics Fault Protection | Nuclear Reactor Control Interface |
Use Scenario: Monitoring hydraulic pressure transducer outputs in fly-by-wire flight control computers. IC Role / Device Role / Timing Role: Dual-comparator configuration implementing window-based fault detection with strobe-synchronized sampling. Use Value: Strobe pin allows precise alignment with ADC sampling clock to eliminate aperture jitter errors. | Use Scenario: Interfacing neutron flux detectors to reactor scram logic in safety-critical nuclear instrumentation. IC Role / Device Role / Timing Role: Comparator generating trip signal when detector current exceeds preset safety limit. Use Value: Input isolation and ±30 V common-mode range accommodate floating detector biasing schemes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM111QML-SP | Identical electrical specs; QML-SP qualification per SMD 5962-8687701 with full lot traceability | Required for DoD procurement contracts mandating SMD compliance | Select LM111QML-SP when SMD drawing 5962-8687701 compliance is contractually required |
| LM111H | Commercial-grade variant; no radiation testing; wider offset voltage (±5 mV) and higher bias current (500 nA) | Suitable only for non-radiation environments such as industrial test equipment | Choose LM111H only for cost-sensitive terrestrial applications where radiation tolerance is unnecessary |
Compared with LM111QML-SP, LM111 MD8 offers identical radiation performance but differs in screening flow and documentation traceability; compared with LM111H, it provides guaranteed 100 krad(Si) ELDRS-free operation and tighter parametric limits essential for mission-critical avionics.
Availability
LM111 MD8 is available at Aetrix Electronics and suitable for spacecraft power regulation, missile guidance subsystems, avionics fault protection, and nuclear instrumentation requiring stable component supply across extended product lifecycles.
Supply support for LM111 MD8 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 specializing in analog and embedded processing technologies with over 50 years of aerospace component heritage.
The LM111 product line was developed specifically for radiation-tolerant analog signal conditioning in military, space, and nuclear applications where long-term reliability under extreme environmental stress is mandatory.
FAQ
What is the maximum allowable differential input voltage for LM111 MD8?
The LM111 MD8 supports a differential input voltage range of ±30 V, as specified in Absolute Maximum Ratings. This allows direct comparison of signals referenced to different supply domains - for example, sensing across a shunt resistor in a high-side power rail while maintaining input integrity. Exceeding ±30 V risks permanent damage to the input stage.
Does LM111 MD8 require external pull-up resistors on its output?
Yes, LM111 MD8 features an open-collector NPN output stage and requires an external pull-up resistor to V+ or another logic rail. Typical values range from 1 kΩ to 10 kΩ depending on speed and load requirements. Without pull-up, the output cannot assert a high logic level, rendering the device nonfunctional in standard digital interface configurations.
Can LM111 MD8 operate from a single 5V supply?
Yes, LM111 MD8 is explicitly rated for single 5V supply operation per its datasheet Features section. When powered from +5V and GND, the output swings from near-GND to ~4.5V (with appropriate pull-up), and input common-mode range extends from 0 V to 3.5 V - sufficient for most logic-level threshold detection tasks in compact avionics modules.
What is the purpose of the Strobe pin on LM111 MD8?
The Strobe pin (Pin 5) on LM111 MD8 disables the input stage when pulled low, forcing the output into high-impedance state. This enables synchronized blanking during data acquisition windows - for instance, preventing false triggers during ADC sampling transitions. It shares the terminal with the Balance function, requiring careful PCB layout to avoid interference.
How does LM111 MD8 differ from commercial LM111 variants in radiation performance?
LM111 MD8 is qualified to 100 krad(Si) ELDRS-free and 50 krad(Si) high-dose-rate per MIL-STD-883 Method 1019, whereas commercial LM111 variants lack radiation testing and exhibit parametric degradation above 5 krad(Si). Key differences include guaranteed post-irradiation offset voltage shift ≤±0.5 mV and leakage current stability - validated across temperature and dose conditions.
LM111 MD8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- Die
- Series:
- LM111
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- Open-Collector
- Voltage - Supply, Single/Dual (±):
- 5V ~ 30V, ±2.5V ~ 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):
- 200ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- Die
LM111 MD8 FAQ
1.How can I place an order for LM111 MD8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM111 MD8 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 LM111 MD8 reliable?
The price and inventory of LM111 MD8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM111 MD8 is usually 5 days.
3.What payment methods are accepted for LM111 MD8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM111 MD8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM111 MD8?
LM111 MD8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM111 MD8 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 LM111 MD8?
For technical support, including LM111 MD8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM111 MD8 requirements.
6.How does Aetrix verify that LM111 MD8 is sourced from the original manufacturer or authorized distributors?
All LM111 MD8 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 LM111 MD8 meets industry standards.
7.What is the process for return or replacement of LM111 MD8?
All LM111 MD8 units undergo pre-shipment inspection (PSI). If there is an issue with LM111 MD8, 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 LM111 MD8 part is unused and in its original packaging.
Return procedure for LM111 MD8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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