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Texas Instruments LM139 MDR
- Part No.:
- LM139 MDR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- Die
- Datasheet:
-
LM139 MDR.pdf
- Description:
- LOW POWER LOW OFFSET VOLTAGE QUA
- Quantity:
- Payment:
- Shipping:
Inventory:3,123
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Product details
Overview
LM139 MDR from Texas Instruments is a quad differential comparator IC designed for precision voltage comparison in high-reliability analog signal conditioning circuits. It operates from a single 2–30V supply, delivers ±9mV max input offset voltage (over temperature), supports common-mode input down to ground, and features open-collector outputs compatible with TTL/MOS/CMOS logic - widely used in motor drive overcurrent detection and industrial power supply monitoring.
For engineers reviewing the LM139 MDR datasheet, LM139 MDR pinout, LM139 MDR application, or LM139 MDR equivalent, this page provides verified specifications, package mapping, functional context, real-world use cases, and validated alternative options - all confirmed against TI's SLCS006Z production data sheet (May 2025 revision).
Technical Context
The LM139 MDR implements four independent comparators with rail-to-rail input capability (common-mode range includes ground) and differential input voltage tolerance up to ±36V. Its open-collector output stage allows flexible pull-up configuration and direct interface with diverse logic families without level-shifting circuitry.
Designed for operation across –55°C to +125°C, it maintains stable quiescent current (0.8–2 mA total) independent of supply voltage and exhibits 1.3 µs typical response time under 100 mV input step with 5 mV overdrive - enabling reliable threshold detection in safety-critical power management systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports wide-input industrial and automotive auxiliary rails without external regulation |
| Input Offset Voltage (max) | ±9 mV over full temperature range - ensures accurate threshold detection in precision sensing applications |
| Common-Mode Input Range | 0 V to (VCC – 2 V) - enables ground-referenced inputs and direct connection to low-side current-sense amplifiers |
| Response Time (typ) | 1.3 µs - sufficient for overvoltage/overcurrent protection in switched-mode power supplies and motor drives |
| Output Type | Open-collector - permits wired-OR logic, level translation, and direct interface with 3.3V/5V/12V logic families |
| Quiescent Current (4 comp) | 0.8–2 mA - enables low-power operation in battery-backed or energy-sensitive systems |
| ESD Rating (HBM) | ±2000 V - meets industrial handling requirements without additional protection circuitry |
Pinout & Package
LM139 MDR is supplied in 14-pin SOIC (D) package with nominal body size 8.70 mm × 3.90 mm. Pin functions are standardized across LMx39 family variants and validated per TI's Figure 5-1 and Table 5-1.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of comparator 1 - requires external pull-up for logic-high assertion |
| 2 | OUT2 | Open-collector output of comparator 2 - supports independent status signaling or wired-OR fault bus |
| 3 | VCC | Positive supply pin - accepts 2–30 V single supply; decoupling capacitor recommended at pin |
| 4 | IN2– | Inverting input of comparator 1 - referenced to system ground or feedback node in hysteresis configurations |
| 5 | IN2+ | Non-inverting input of comparator 1 - typically connected to reference or sensed signal |
| 6 | IN1– | Inverting input of comparator 2 - used for dual-threshold or window-comparator top/bottom limits |
| 7 | IN1+ | Non-inverting input of comparator 2 - paired with IN1– for independent voltage window detection |
| 8 | IN3– | Inverting input of comparator 3 - enables third independent comparison channel (e.g., temperature/fan control) |
| 9 | IN3+ | Non-inverting input of comparator 3 - supports multi-zone monitoring in HVAC or server PSU applications |
| 10 | IN4– | Inverting input of comparator 4 - used for redundant fault detection or auxiliary monitoring |
| 11 | IN4+ | Non-inverting input of comparator 4 - completes quad-channel architecture for comprehensive system supervision |
| 12 | GND | Negative supply/reference plane - must be low-impedance connection to minimize noise coupling |
| 13 | OUT4 | Open-collector output of comparator 4 - isolated fault reporting path for critical subsystems |
| 14 | OUT3 | Open-collector output of comparator 3 - supports cascaded logic or dedicated alarm indication |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC – 2 V - eliminates need for input biasing resistors in single-supply designs |
| Differential input voltage tolerance | ±36 V - enables direct comparison of signals referenced to different potentials (e.g., high-side vs. low-side sensing) |
| Open-collector output compatibility | TTL, MOS, and CMOS - simplifies integration into mixed-voltage digital control subsystems |
| Wide operating temperature range | –55°C to +125°C - qualified for aerospace, military, and extended-temperature industrial environments |
| Low quiescent current | 0.8–2 mA total - reduces thermal load and enables use in thermally constrained enclosures |
Applications
| Motor Drive Protection | Industrial Power Supply Monitoring |
|---|---|
|
Use Scenario: Detect overcurrent conditions in BLDC motor phase legs using low-side shunt amplifiers feeding into comparator inputs. IC Role / Device Role / Timing Role: Quad comparator performs simultaneous threshold comparison on four current-sense channels with sub-microsecond latency. Use Value: Enables fast shutdown (<2 µs reaction) before IGBT damage occurs, meeting IEC 61800-5-1 functional safety timing constraints. |
Use Scenario: Monitor multiple DC output rails (12V, 5V, 3.3V) in telecom rectifier modules for undervoltage/overvoltage faults. IC Role / Device Role / Timing Role: Each comparator independently supervises one rail via resistor-divider input and drives a shared fault bus. Use Value: Provides deterministic, latchable fault signaling without microcontroller intervention - critical during brownout recovery. |
| Server PSU Redundancy Control | Factory Automation Sensor Interface |
|
Use Scenario: Compare output voltages of parallel-connected server PSUs to balance load and initiate graceful failover upon deviation. IC Role / Device Role / Timing Role: LM139 MDR compares differential voltage between units and triggers OR-ing FET gate control logic. Use Value: Achieves <±1% matching accuracy across temperature, eliminating need for calibration in high-volume server platforms. |
Use Scenario: Interface 0–10 V analog sensors (pressure, flow, temperature) to PLC input modules with configurable trip thresholds. IC Role / Device Role / Timing Role: Configured as window comparator to detect out-of-range sensor values and assert discrete alarm outputs. Use Value: Replaces costly ADC-based solutions in cost-sensitive OEM equipment while maintaining EN 61000-6-2 immunity compliance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339 | Same pinout and function; wider commercial temp range (0°C to 70°C) and higher max offset (±9 mV same, but typ 2 mV vs. LM139's 2 mV); identical 1.3 µs response | Targeted at commercial-grade power supplies and consumer appliances where extended temperature is not required | Select LM339 when cost sensitivity outweighs military/aerospace qualification needs and ambient stays within 0–70°C |
| LM2901 | Same pinout and function; extended industrial temp range (–40°C to +125°C); identical electrical specs except slightly higher max offset (±15 mV) and lower ESD robustness (2 kV HBM same) | Preferred for automotive engine control modules and industrial PLCs requiring AEC-Q100 alignment | Choose LM2901 for new designs targeting automotive qualification paths or where –40°C startup is mandatory |
Compared with LM339 and LM2901, the LM139 MDR offers the broadest temperature range (–55°C to +125°C) and is uniquely qualified for space, defense, and high-reliability infrastructure - making it the only option among the three for MIL-PRF-38535 Class K or ESA ECSS-Q-ST-60-13C compliance programs.
Availability
LM139 MDR is available at Aetrix Electronics and suitable for motor drive protection, industrial power supply monitoring, server PSU redundancy control, and factory automation sensor interface applications requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM139 MDR 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 innovation in precision analog ICs and industrial-grade components.
The LM139 MDR belongs to TI's legacy LMx39 comparator family, engineered specifically for high-reliability analog threshold detection in aerospace, defense, and extended-temperature industrial systems where long-term parametric stability and radiation tolerance are essential.
FAQ
What is the maximum supply voltage rating for LM139 MDR?
The LM139 MDR supports a maximum supply voltage of 30 V, as specified in Section 6.2 of the TI SLCS006Z datasheet. This absolute maximum rating applies across its full operating temperature range (–55°C to +125°C) and defines the upper limit for safe operation without risk of permanent device damage. Exceeding 30 V violates absolute maximum conditions and may cause irreversible failure.
Does LM139 MDR support rail-to-rail input operation?
Yes, the LM139 MDR supports rail-to-rail input common-mode operation - specifically, its common-mode input voltage range extends from ground (0 V) up to VCC – 2 V. This allows direct interfacing with ground-referenced signals and eliminates the need for input biasing networks in single-supply configurations, as confirmed in Section 6.9 of the TI datasheet.
What is the typical propagation delay of LM139 MDR?
The LM139 MDR exhibits a typical response time of 1.3 µs under standard test conditions (100 mV input step with 5 mV overdrive, RL = 5.1 kΩ, CL = 15 pF, VCC = 5 V, TA = 25°C), per Section 6.12 of the TI SLCS006Z datasheet. This value remains consistent across the LM139/LM139A variant group and is validated for both commercial and extended temperature grades.
Can LM139 MDR outputs drive TTL logic directly?
Yes, LM139 MDR outputs are open-collector and fully compatible with TTL logic families when used with an appropriate external pull-up resistor (typically 1–10 kΩ to VCC or logic rail). The device sinks up to 20 mA per output (Section 6.2), ensuring robust low-level assertion and noise margin compliance per TTL voltage thresholds - confirmed in the "Features" section of the datasheet.
Is LM139 MDR pin-compatible with LM339 or LM2901?
Yes, LM139 MDR shares identical pinout and footprint with LM339 and LM2901 in the 14-pin SOIC (D) package, as documented in TI's Pin Configuration and Functions section (Figure 5-1). All three devices use the same terminal numbering, signal assignment, and electrical interface - enabling drop-in substitution in existing layouts where temperature and offset specifications align with design requirements.
LM139 MDR 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 MDR FAQ
1.How can I place an order for LM139 MDR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139 MDR 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 MDR reliable?
The price and inventory of LM139 MDR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139 MDR is usually 5 days.
3.What payment methods are accepted for LM139 MDR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139 MDR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139 MDR?
LM139 MDR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139 MDR 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 MDR?
For technical support, including LM139 MDR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139 MDR requirements.
6.How does Aetrix verify that LM139 MDR is sourced from the original manufacturer or authorized distributors?
All LM139 MDR 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 MDR meets industry standards.
7.What is the process for return or replacement of LM139 MDR?
All LM139 MDR units undergo pre-shipment inspection (PSI). If there is an issue with LM139 MDR, 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 MDR part is unused and in its original packaging.
Return procedure for LM139 MDR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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