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Texas Instruments LM111-MDE
- Part No.:
- LM111-MDE
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- Die
- Datasheet:
-
LM111-MDE.pdf
- Description:
- IC COMPARATOR 1 GEN PUR DIESALE
- Quantity:
- Payment:
- Shipping:
Inventory:1,486
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Product details
Overview
LM111-MDE from Texas Instruments is a radiation-hardened voltage comparator designed for space and high-reliability military 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 support fault-tolerant analog monitoring in satellite power regulation and avionics sensor interfaces.
For engineers reviewing the LM111-MDE datasheet, LM111-MDE pinout, LM111-MDE application, or LM111-MDE equivalent, this page provides verified radiation tolerance (100 krad(Si) ELDRS-free), thermal performance across −55°C to +125°C, wire-ORable open-collector output behavior, and package-specific derating curves for TO-99 and CDIP variants - critical for mission-critical timing and threshold detection design.
Technical Context
The LM111-MDE implements a bipolar transistor-based comparator architecture with separate balance and strobe terminals enabling external offset trimming and synchronous gating. Its output stage is an NPN open-collector transistor capable of switching up to 50V loads referenced to ground, positive supply, or negative supply - supporting direct relay or lamp drive without external pull-ups.
It features dual-rail operation with input common-mode range extending to ±30 V, independent of supply rails, and maintains stable performance under total ionizing dose (TID) exposure up to 100 krad(Si) with no enhanced low-dose-rate sensitivity (ELDRS). Strobe functionality allows dynamic enable/disable of comparison during critical system states.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Bias Current | 200 nA max over temperature - enables high-impedance sensor interfacing without loading precision voltage dividers. |
| Differential Input Voltage Range | ±30 V - supports direct measurement across wide-voltage rails (e.g., battery stack monitoring in spacecraft). |
| Output Sink Current | 50 mA - drives electromechanical relays or indicator lamps directly without buffer stages. |
| Supply Voltage Range | Single 5V to ±15V - interoperates with both digital logic supplies and legacy op-amp rails. |
| Response Time | 300 ns (min) at 5 mV overdrive - sufficient for power-supply fault detection and analog watchdog timing. |
| Operating Temperature | −55°C to +125°C - qualified for unheated satellite bays and jet engine-mounted control units. |
| Radiation Tolerance | 100 krad(Si), ELDRS-free - certified for long-duration LEO/GEO missions per MIL-STD-883 Method 1019. |
Pinout & Package
LM111-MDE is available in hermetically sealed TO-99 metal can (Package Number LMC0008C) and ceramic dual-in-line (CDIP, Package Number NAB0008A), both with 8 leads. Pin 4 is internally connected to case for shielding and thermal conduction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Balance | Connects to external potentiometer for precise input offset voltage nulling. |
| 2 | Inverting Input (IN−) | Differential input node; accepts signals up to ±30 V relative to either supply rail. |
| 3 | Non-Inverting Input (IN+) | Differential input node; fully isolated from ground and supply references. |
| 4 | Case / Shield | Internally tied to metal can; must be grounded for EMI suppression and thermal dissipation. |
| 5 | Balance/Strobe | Shared terminal: enables offset trim or acts as active-low strobe to inhibit output state changes. |
| 6 | Ground (GND) | Reference node for internal circuitry; may be floated relative to system ground if required. |
| 7 | Output (Collector) | Open-collector NPN output; requires external pull-up to define logic-high level and load voltage. |
| 8 | Positive Supply (V+) | Accepts +5V to +30V in single-supply mode or +15V in dual-rail configuration. |
Key Features
| Feature | Design Value |
|---|---|
| Strobe Capability | Active-low enable/disable of comparison action via Pin 5 - prevents false triggering during power sequencing or reset. |
| Offset Null Adjustment | Two-terminal balance network (Pins 1 and 5) permits <±0.5 mV residual offset after calibration - critical for precision threshold detection. |
| Wire-ORable Output | Open-collector collector output allows multiple LM111-MDE devices to share a single pull-up and bus line - simplifies multi-sensor alarm aggregation. |
| Supply Rail Flexibility | Operates with asymmetric supplies (e.g., +2V/−28V) while maintaining full input common-mode range - supports legacy aerospace power architectures. |
| Ground-Isolated I/O | Inputs and output can reference different potentials (ground, V+, or V−) - enables floating measurements in high-side current sensing or isolated DC-DC monitoring. |
Applications
| Power System Monitoring | Satellite Sensor Interface |
|---|---|
Use Scenario: Real-time detection of undervoltage/overvoltage events on primary bus in LEO satellite power distribution unit. IC Role / Device Role / Timing Role: Voltage comparator performing threshold comparison between regulated bus and precision reference. Use Value: 300 ns response ensures fault isolation within 1 µs; radiation-hardened design prevents latch-up during solar particle events. | Use Scenario: Conditioning thermistor and RTD outputs from thermal control subsystem before digitization. IC Role / Device Role / Timing Role: Precision window comparator generating discrete alarm flags for out-of-range temperatures. Use Value: ±30 V input range accommodates sensor excitation voltages and common-mode offsets; 200 nA input bias avoids self-heating errors in high-resistance sensors. |
| Avionics Fault Detection | Radiation Test Equipment |
Use Scenario: Monitoring hydraulic pressure transducer outputs in fly-by-wire flight control computers. IC Role / Device Role / Timing Role: High-reliability comparator validating analog feedback against safety thresholds. Use Value: −55°C to +125°C operation covers extended environmental envelope; TO-99 package provides EMI shielding in noisy cockpit environments. | Use Scenario: Signal conditioning stage in ground-based TID test setups verifying component degradation under controlled gamma irradiation. IC Role / Device Role / Timing Role: Reference comparator used to calibrate irradiation chamber dosimetry circuits. Use Value: Post-irradiation parameter shift limited to ±0.5 mV offset voltage delta - enables traceable metrology-grade validation. |
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; screened to SMD 5962-8687701 with full QML-Q qualification and lot traceability. | Required for DoD procurement contracts mandating QML-Q certification; same pinout and footprint. | Select LM111QML-SP when formal QML-Q documentation, lot acceptance testing, and DSCC source control drawing compliance are mandatory. |
| LM111H | Commercial-grade variant; no radiation assurance; rated only to 85°C ambient; lower test coverage. | Suitable for ground-test fixtures or non-flight prototypes where radiation tolerance is unnecessary. | Choose LM111H only for lab development or cost-sensitive terrestrial applications - not for flight hardware. |
Compared with LM111QML-SP, LM111-MDE offers identical radiation performance but may differ in screening depth and documentation traceability; versus LM111H, it provides guaranteed ELDRS-free operation and extended temperature range essential for deployed space systems.
Availability
LM111-MDE is available at Aetrix Electronics and suitable for satellite power regulation, avionics fault detection, and radiation test instrumentation requiring stable component supply across extended temperature and radiation environments.
Supply support for LM111-MDE 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 decades of heritage in high-reliability aerospace components.
The LM111 product line was developed specifically for radiation-tolerant analog signal conditioning in spaceflight and defense systems, emphasizing parametric stability under TID, SEE, and extreme thermal cycling.
FAQ
What is the maximum allowable differential input voltage for LM111-MDE?
The LM111-MDE supports a differential input voltage range of ±30 V, as specified in Absolute Maximum Ratings. This allows direct connection across high-voltage nodes such as battery strings or motor phase lines without external attenuation. The rating holds regardless of supply voltage configuration - whether operating from single 5V or dual ±15V rails - and is validated across the full −55°C to +125°C temperature range.
Does LM111-MDE require external pull-up resistors on its output?
Yes, LM111-MDE features an open-collector NPN output stage (Pin 7) and requires an external pull-up resistor to define the logic-high voltage level and sink current path. Typical values range from 1 kΩ to 10 kΩ depending on load capacitance and speed requirements. The device can sink up to 50 mA, enabling direct drive of LEDs, relays, or TTL/DTL-compatible inputs when paired with appropriate pull-up selection.
How does the strobe function operate on LM111-MDE?
The strobe function is implemented on Pin 5 (Balance/Strobe). When pulled low, it disables the internal comparator's output stage, forcing the collector output into high-impedance (open) state - effectively freezing the output regardless of input conditions. This is used for synchronized sampling, power sequencing control, or preventing false triggers during transient events. Strobe current is limited to 10 mA maximum per Absolute Maximum Ratings.
Can LM111-MDE be used with a single 5V supply?
Yes, LM111-MDE is explicitly characterized for single 5V operation per its datasheet features and Recommended Operating Conditions. In this configuration, Pin 6 (GND) serves as the reference, Pin 8 (V+) connects to +5V, and the output pulls down to near ground. Input common-mode range remains functional from 0 V to 3.5 V, supporting standard logic-level comparisons and sensor interfacing without level-shifting circuitry.
What radiation hardness specifications apply to LM111-MDE?
LM111-MDE is rated for 100 krad(Si) total ionizing dose (TID) with ELDRS-free performance, verified per MIL-STD-883 Method 1019 Condition A. It exhibits no enhanced low-dose-rate sensitivity and maintains post-irradiation offset voltage shift within ±0.5 mV. These characteristics are confirmed across all tested variants including LM111QML and LM111-SMD configurations documented in TI's SNOSAJ4C datasheet revision.
LM111-MDE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 1
- Output Type:
- DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 36V, ±2.5V ~ 18V
- :
- 3mV @ ±15V
- Voltage - Input Offset (Max):
- 0.1µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 6mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- Diesale
LM111-MDE FAQ
1.How can I place an order for LM111-MDE through Aetrix?
Please submit a Request for Quotation (RFQ) for LM111-MDE 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-MDE reliable?
The price and inventory of LM111-MDE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM111-MDE is usually 5 days.
3.What payment methods are accepted for LM111-MDE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM111-MDE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM111-MDE?
LM111-MDE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM111-MDE 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-MDE?
For technical support, including LM111-MDE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM111-MDE requirements.
6.How does Aetrix verify that LM111-MDE is sourced from the original manufacturer or authorized distributors?
All LM111-MDE 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-MDE meets industry standards.
7.What is the process for return or replacement of LM111-MDE?
All LM111-MDE units undergo pre-shipment inspection (PSI). If there is an issue with LM111-MDE, 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-MDE part is unused and in its original packaging.
Return procedure for LM111-MDE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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