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Texas Instruments LM111J-8
- Part No.:
- LM111J-8
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-CDIP (0.300", 7.62mm)
- Datasheet:
-
LM111J-8.pdf
- Description:
- IC COMPARATOR 1 GEN PUR 8CDIP
- Quantity:
- Payment:
- Shipping:
Inventory:629
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Product details
Overview
LM111J-8 from Texas Instruments is a military-grade voltage comparator with −55°C to +125°C operating temperature range, 200 ns response time, ±30 V differential input voltage capability, and strobe-enabled output disable function. It drives loads referenced to ground, V+, or V−, supporting relay, lamp, and TTL/DTL/RTL interfacing in ruggedized analog signal conditioning systems.
For engineers reviewing the LM111J-8 datasheet, LM111J-8 pinout, LM111J-8 application, or LM111J-8 equivalent, this page delivers verified military-spec electrical parameters, CDIP-8 package mapping, strobe control design guidance, and direct alternatives for high-reliability comparator selection in aerospace, defense, and industrial control environments.
Technical Context
The LM111J-8 implements a bipolar open-collector output stage capable of switching up to 50 V at 50 mA, with independent input and output isolation from system ground. Its internal offset balancing network (pins 5 and 6) enables precise nulling under wide supply conditions (±15 V or single 5 V).
Strobe functionality (pin 7) requires 3–5 mA sink current to disable output-grounding is prohibited. Input bias current remains ≤150 nA over full temperature range, enabling high-impedance sensing without significant loading error.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Temp Range | −55°C to +125°C - qualified for military/aerospace deployment per RETS111X spec |
| Response Time | 200 ns - supports fast edge detection in pulse-width modulation and zero-crossing circuits |
| Differential Input Voltage | ±30 V - allows direct comparison of signals across wide common-mode ranges |
| Input Bias Current | ≤150 nA max - preserves accuracy in high-Z sensor interfaces (e.g., photodiode, strain gauge) |
| Output Drive Capability | 50 V / 50 mA - directly switches relays, lamps, or logic families without external buffers |
| Strobe Control | 3–5 mA sink required on pin 7 - enables synchronized blanking in multiplexed comparator arrays |
| Supply Voltage Range | Single 5 V or dual ±15 V - interoperable with both logic and op-amp supply domains |
Pinout & Package
LM111J-8 is housed in an 8-pin Ceramic Dual-In-Line Package (CDIP), designated NAB by Texas Instruments, with hermetic sealing and lead finish per MIL-STD-1835. Package dimensions: 0.228–0.244 in width × 0.150–0.157 in height × 0.069 in max thickness [5.80–6.19 mm × 3.81–3.98 mm × 1.75 mm].
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 - Output | Open-collector output | Sinks current to drive grounded loads; requires external pull-up for logic-high level |
| 2 - Inverting Input (−) | Differential input node | Accepts reference or threshold signal; high impedance (≤150 nA bias) minimizes loading |
| 3 - Non-Inverting Input (+) | Differential input node | Accepts sensed signal; supports common-mode range up to ±30 V relative to inputs |
| 4 - V− | Negative supply rail | Reference for internal circuitry; must be ≥−30 V below ground per absolute max rating |
| 5 - Balance / Offset Null | Offset adjustment terminal | Connected to potentiometer wiper for trimming input offset voltage to <4 mV |
| 6 - Balance / Offset Null | Offset adjustment terminal | Paired with pin 5 to form 2-terminal null network; short together if unused |
| 7 - Strobe | Output enable/disable control | Must sink 3–5 mA to disable output; grounding causes malfunction or damage |
| 8 - V+ | Positive supply rail | Supports single 5 V or dual ±15 V operation; total supply voltage ≤36 V |
Key Features
| Feature | Design Value |
|---|---|
| Input Isolation | Both inputs and output electrically isolated from system ground - enables floating measurements and level-shifting |
| Wire-OR Capability | Open-collector output permits multiple comparators to share one pull-up resistor - simplifies priority encoder and alarm bus designs |
| Strobe-Controlled Disable | Pin 7 disables output without affecting input bias or offset - critical for time-gated sampling and synchronized signal processing |
| Wide Supply Flexibility | Operates from single 5 V logic supply or standard ±15 V op-amp rails - reduces need for auxiliary power domains |
| Military Temperature Qualification | Tested and specified over −55°C to +125°C per RETS111X - ensures reliability in extreme environmental conditions |
Applications
| Relay Control in Avionics | Zero-Crossing Detection |
|---|---|
Use Scenario: Driving electromagnetic relays in flight control surface actuation systems where EMI resilience and thermal stability are mandatory. IC Role / Device Role / Timing Role: Voltage comparator comparing feedback voltage against precision reference to trigger relay closure at defined thresholds. Use Value: 50 V/50 mA output drive eliminates buffer transistors; strobe pin enables synchronized deactivation during system reset sequences. |
Use Scenario: Detecting AC line voltage zero crossings in motor phase controllers for precise timing of TRIAC firing pulses. IC Role / Device Role / Timing Role: High-speed comparator with low input bias current ensuring minimal phase shift between input waveform and digital edge output. Use Value: 200 ns response time guarantees sub-microsecond timing resolution; ±30 V input range accommodates unconditioned line sensing. |
| Photodiode Signal Conditioning | High-Voltage Threshold Monitoring |
Use Scenario: Amplifying and comparing weak photocurrents from radiation-hardened optical sensors in satellite payload telemetry chains. IC Role / Device Role / Timing Role: Precision comparator with ≤150 nA input bias current preserving signal integrity in picoamp-level transimpedance amplifier outputs. Use Value: Offset null pins (5/6) allow calibration of dark-current drift; military temp range ensures stable operation in orbital thermal cycling. |
Use Scenario: Monitoring DC bus voltage in 48 V telecom power systems to initiate shutdown before overvoltage damage occurs. IC Role / Device Role / Timing Role: High-common-mode comparator isolating measurement circuit from noisy high-voltage domain using resistive divider input. Use Value: ±30 V differential input voltage rating enables direct connection to scaled-down bus signals without attenuation errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM111H | Same −55°C to +125°C rating and TO-99 metal-can package; identical electrical specs but different mechanical form factor | Preferred where hermetic metal packaging and superior thermal conductivity are required over ceramic DIP | Select LM111H when board-level EMI shielding or higher thermal dissipation is needed; LM111J-8 suits space-constrained PCB layouts |
| LM211-N | Commercial-grade variant rated −25°C to +85°C; otherwise identical pinout, strobe function, and 200 ns response time | Used in non-military industrial controls where extended temperature range is not required | Choose LM211-N for cost-sensitive, non-ruggedized applications; LM111J-8 is mandatory for MIL-PRF-38535 compliance |
Compared with LM111H, LM111J-8 offers identical military performance in a smaller, surface-mount-compatible CDIP package; compared with LM211-N, it provides guaranteed operation across the full military temperature range and enhanced long-term reliability under thermal stress.
Availability
LM111J-8 is available at Aetrix Electronics and suitable for avionics subsystems, satellite power management, industrial safety interlocks, and defense electronics requiring stable component supply across extended temperature and lifecycle requirements.
Supply support for LM111J-8 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 precision analog ICs and military-qualified components.
The LM111 family was designed specifically for high-reliability voltage comparison in harsh-environment systems, emphasizing input isolation, wide supply flexibility, and robust strobe-controlled output staging.
FAQ
What is the maximum allowable supply voltage for LM111J-8?
The LM111J-8 has an absolute maximum total supply voltage of 36 V, meaning the difference between V+ and V− must not exceed this value. This applies regardless of whether operated from single 5 V or dual ±15 V supplies. Exceeding 36 V risks permanent device damage, as confirmed in the Absolute Maximum Ratings table of the SNOSBJ1E datasheet.
Can LM111J-8 drive a 24 V relay directly?
Yes, LM111J-8 can directly drive a 24 V relay because its output is rated for up to 50 V with 50 mA sink capability. When used with an appropriate pull-up resistor to 24 V, the open-collector output fully saturates below 1.5 V at 50 mA, ensuring reliable relay coil activation. The strobe pin (pin 7) allows controlled disabling during system initialization.
How does the strobe function work on LM111J-8?
The strobe pin (pin 7) on LM111J-8 must sink 3–5 mA to disable the output - it is not a logic-level input. Pulling this pin low via a resistor to ground will not achieve disable; instead, a current source or active sink circuit is required. Grounding pin 7 is explicitly prohibited and may damage the device, as stated in TI's application notes and datasheet warnings.
What package type is LM111J-8 supplied in?
LM111J-8 is supplied in an 8-pin Ceramic Dual-In-Line Package (CDIP), designated NAB by Texas Instruments. It features hermetic ceramic construction, gold-plated leads, and is packaged in tubes of 40 units. Mechanical drawings confirm dimensions of 0.228–0.244 in width × 0.150–0.157 in height, compliant with MIL-STD-1835.
Is LM111J-8 pin-compatible with LM311N/NOPB?
No, LM111J-8 is not pin-compatible with LM311N/NOPB. While both are 8-pin comparators, LM111J-8 uses the CDIP (NAB) package with pin 1 as output, whereas LM311N/NOPB uses PDIP (P) packaging and differs in internal strobe behavior and temperature specification. Pin mapping and mechanical footprint are incompatible; PCB layout redesign is required for substitution.
LM111J-8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-CDIP (0.300", 7.62mm)
- 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:
- Through Hole
- :
- 8-CDIP
LM111J-8 FAQ
1.How can I place an order for LM111J-8 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM111J-8 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 LM111J-8 reliable?
The price and inventory of LM111J-8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM111J-8 is usually 5 days.
3.What payment methods are accepted for LM111J-8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM111J-8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM111J-8?
LM111J-8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM111J-8 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 LM111J-8?
For technical support, including LM111J-8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM111J-8 requirements.
6.How does Aetrix verify that LM111J-8 is sourced from the original manufacturer or authorized distributors?
All LM111J-8 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 LM111J-8 meets industry standards.
7.What is the process for return or replacement of LM111J-8?
All LM111J-8 units undergo pre-shipment inspection (PSI). If there is an issue with LM111J-8, 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 LM111J-8 part is unused and in its original packaging.
Return procedure for LM111J-8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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