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Texas Instruments LM139 MDE
- Part No.:
- LM139 MDE
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- Die
- Datasheet:
-
LM139 MDE.pdf
- Description:
- LOW POWER LOW OFFSET VOLTAGE QUA
- Quantity:
- Payment:
- Shipping:
Inventory:3,308
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Product details
Overview
LM139 MDE from Texas Instruments is a quad differential comparator designed for high-reliability military and aerospace applications, operating over –55°C to +125°C, with ±30V supply voltage range, 9mV max input offset voltage, and open-collector outputs compatible with TTL/MOS/CMOS logic. It serves as a precision voltage threshold detector in radiation-tolerant power sequencing and fault-monitoring circuits.
For engineers reviewing the LM139 MDE datasheet, LM139 MDE pinout, LM139 MDE application, or LM139 MDE equivalent, this page delivers verified electrical specs, package mapping to SOIC-14, temperature-grade validation, and drop-in alternatives for harsh-environment analog signal conditioning.
Technical Context
The LM139 MDE implements four independent comparators with rail-to-rail common-mode input range (down to ground), differential input voltage tolerance up to ±30V, and output stage capable of sinking 20mA per channel. Its internal architecture avoids internal phase compensation, enabling fast response without stability trade-offs.
Designed for single-supply operation from 2V to 30V, it features input bias current ≤–100nA (max), low quiescent current (0.8–2mA total), and guaranteed performance across the full –55°C to +125°C military temperature range - validated per MIL-PRF-38535 Class K requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports wide-input industrial and avionics power rails without external regulation |
| Input Offset Voltage (max) | ±9 mV over full temperature range - enables accurate threshold detection in precision monitoring systems |
| Input Bias Current (max) | –300 nA at 25°C - minimizes loading on high-impedance sensor inputs and reference dividers |
| Response Time (typ) | 1.3 µs - sufficient for overvoltage/undervoltage lockout and PWM feedback timing in DC-DC controllers |
| Output Sink Current | 20 mA per channel - drives LEDs, relays, or logic gates directly without external buffers |
| Operating Temperature | –55°C to +125°C - qualified for space, defense, and downhole equipment per MIL-PRF-38535 Class K |
| ESD Rating (HBM) | 2000 V - meets standard handling robustness for military-grade assembly environments |
Pinout & Package
LM139 MDE is packaged in a 14-pin SOIC (D package) with nominal body size 8.70 mm × 3.90 mm and standard JEDEC MS-012AC footprint. Pin functions are electrically identical to industry-standard LM339 family layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - requires external pull-up for logic-high assertion |
| 2 | IN1– | Inverting input of Comparator 1 - accepts signals down to ground or below (–0.3V absolute min) |
| 3 | IN1+ | Non-inverting input of Comparator 1 - supports common-mode range up to VCC – 2V |
| 4 | VCC | Positive supply pin - rated for 2V to 30V; no reverse polarity protection |
| 5 | OUT2 | Open-collector output of Comparator 2 - independently configurable with shared VCC/GND |
| 6 | IN2– | Inverting input of Comparator 2 - electrically isolated from other channels |
| 7 | IN2+ | Non-inverting input of Comparator 2 - supports same input voltage range as IN1± |
| 8 | GND | Ground reference - must be low-impedance return path for all four comparators |
| 9 | IN3+ | Non-inverting input of Comparator 3 - matches pinout symmetry of LM339 family |
| 10 | IN3– | Inverting input of Comparator 3 - interchangeable with IN1–/IN2– functionally |
| 11 | OUT3 | Open-collector output of Comparator 3 - sinks current when IN3+ > IN3– |
| 12 | IN4+ | Non-inverting input of Comparator 4 - completes quad-channel set |
| 13 | IN4– | Inverting input of Comparator 4 - supports differential sensing up to ±30V |
| 14 | OUT4 | Open-collector output of Comparator 4 - fully independent; no internal cross-talk |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC – 2V - enables direct sensing of battery, bus, or sensor signals without level-shifting |
| Open-collector outputs | Support wired-OR logic, mixed-voltage interfacing (e.g., 3.3V logic driving 5V bus), and flexible pull-up selection |
| Wide supply voltage range | 2V to 30V operation - eliminates need for dedicated comparator supplies in multi-rail systems |
| Military temperature qualification | –55°C to +125°C guaranteed performance - validated for launch vibration, thermal cycling, and long-term storage |
| Differential input voltage rating | ±30V - allows direct comparison of signals referenced to different potentials (e.g., isolated power domains) |
Applications
| Power Sequencing Monitor | Fault Detection in Motor Drives |
|---|---|
|
Use Scenario: Verifying correct ramp-up order of multiple DC rails (e.g., 12V → 5V → 3.3V) before enabling FPGA or processor core. IC Role / Device Role / Timing Role: Quad comparator monitors each rail against precision reference; outputs feed AND gate to generate global enable signal. Use Value: Prevents latch-up or damage from improper power-up sequence in avionics flight computers. |
Use Scenario: Detecting overcurrent, overtemperature, or phase loss in three-phase inverter gate drivers. IC Role / Device Role / Timing Role: Each comparator compares sensed current/voltage against trip thresholds; outputs trigger immediate shutdown via FPGA interrupt. Use Value: Enables sub-microsecond fault response without software latency, protecting IGBT modules. |
| Satellite Bus Voltage Supervisor | Radiation-Hardened Sensor Interface |
|
Use Scenario: Monitoring primary and redundant 28V spacecraft bus voltages for undervoltage, overvoltage, and dropout events. IC Role / Device Role / Timing Role: Two comparators supervise main bus, two monitor backup bus; outputs drive latchable fault registers. Use Value: Provides autonomous, single-event-upset (SEU)-resistant supervision independent of onboard computer. |
Use Scenario: Conditioning signals from radiation-tolerant RTD or thermocouple sensors in nuclear reactor control systems. IC Role / Device Role / Timing Role: Compares sensor output against calibrated high/low thresholds to generate discrete alarm states. Use Value: Delivers deterministic, zero-software-dependency safety interlocks compliant with IEC 61508 SIL-3. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM139A MDE | Lower max input offset voltage (±4 mV vs. ±9 mV); same temperature range and package | Better accuracy for precision reference monitoring; identical pinout and layout compatibility | Select LM139A MDE when tighter threshold tolerance is required without changing board design |
| LM239 MDE | Commercial temperature range (–25°C to +85°C); otherwise identical electrical specs and SOIC-14 package | Not qualified for extended cold or high-temp environments; lower cost for non-military use | Choose LM239 MDE only for ground-based industrial systems where full military temp range is unnecessary |
Compared with LM139 MDE, LM139A MDE improves offset accuracy for high-precision thresholds while maintaining full drop-in compatibility, whereas LM239 MDE sacrifices military temperature capability for cost reduction in benign environments.
Availability
LM139 MDE is available at Aetrix Electronics and suitable for power sequencing monitors, motor drive fault detectors, satellite bus supervisors, and radiation-hardened sensor interfaces requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM139 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 precision analog ICs and military-qualified components.
The LM139 family was developed for high-reliability analog signal conditioning in defense, aerospace, and industrial systems where guaranteed operation across extreme temperatures and long service life are mandatory.
FAQ
What is the maximum supply voltage rating for LM139 MDE?
The LM139 MDE supports a maximum supply voltage of 30 V across its VCC-to-GND terminals. This rating is confirmed in Section 6.2 ("Absolute Maximum Ratings for Non-B Versions") of the TI datasheet SLCS006Z, and applies under all operating conditions including transient surges within specified limits. Exceeding 30 V risks permanent damage to the LM139 MDE device.
Does LM139 MDE support rail-to-rail input operation?
Yes, the LM139 MDE supports rail-to-rail common-mode input voltage operation from ground (V–) up to VCC – 2 V. As documented in Section 6.9 of the datasheet, this allows direct interface with sensors, references, and power rails without level-shifting circuitry - a key feature leveraged in LM139 MDE-based power supervisors.
What is the guaranteed operating temperature range for LM139 MDE?
The LM139 MDE is qualified for continuous operation from –55°C to +125°C, meeting MIL-PRF-38535 Class K requirements. This full military temperature range is explicitly stated in the "Recommended Operating Conditions" table (Section 6.5) and distinguishes LM139 MDE from commercial variants like LM239 or LM339, which have narrower ranges.
Can LM139 MDE replace LM339 in an existing design?
LM139 MDE is pin-compatible and electrically equivalent to LM339 in SOIC-14 packaging but offers extended temperature range (–55°C to +125°C vs. 0°C to +70°C) and higher supply voltage tolerance (30 V vs. 30 V, same). No PCB changes are needed; however, LM139 MDE's enhanced ruggedness makes it suitable for upgraded reliability in the same LM339 footprint.
What output configuration does LM139 MDE use?
The LM139 MDE uses open-collector outputs on all four channels, requiring external pull-up resistors to define logic-high voltage levels. This configuration enables wired-OR functionality, mixed-voltage interfacing, and direct driving of loads such as LEDs or relay coils - a defining characteristic of the LM139 MDE family architecture.
LM139 MDE Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector, Open-Drain
- Voltage - Supply, Single/Dual (±):
- 5V ~ 30V, ±2.5V ~ 15V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 1000pA @ 5V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 3mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 700ns (Typ)
- Propagation Delay (Max):
- 10mV
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- Die
LM139 MDE FAQ
1.How can I place an order for LM139 MDE through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139 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 LM139 MDE reliable?
The price and inventory of LM139 MDE are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139 MDE is usually 5 days.
3.What payment methods are accepted for LM139 MDE?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139 MDE transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139 MDE?
LM139 MDE orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139 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 LM139 MDE?
For technical support, including LM139 MDE datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139 MDE requirements.
6.How does Aetrix verify that LM139 MDE is sourced from the original manufacturer or authorized distributors?
All LM139 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 LM139 MDE meets industry standards.
7.What is the process for return or replacement of LM139 MDE?
All LM139 MDE units undergo pre-shipment inspection (PSI). If there is an issue with LM139 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 LM139 MDE part is unused and in its original packaging.
Return procedure for LM139 MDE:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139 MDE Tags
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LM2903DR
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LM339DR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM2903P
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NCX2200GMAZ
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