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Texas Instruments LM139DR
- Part No.:
- LM139DR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM139DR.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,880
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Product details
Overview
LM139DR from Texas Instruments is a quad differential comparator IC designed for precision voltage comparison in single-supply systems. It features ±9 mV max input offset voltage, 0.8–2 mA total supply current, −55°C to +125°C operating temperature range, and rail-to-rail common-mode input range down to ground. It is used in industrial motor control feedback circuits where wide-temperature reliability and ground-sensing capability are required.
For engineers reviewing the LM139DR datasheet, LM139DR pinout, LM139DR application, or LM139DR equivalent, this page delivers verified specifications, SOIC-14 package details, real-world use scenarios in safety-critical analog monitoring, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The LM139DR implements four independent open-collector comparators with input stages optimized for operation from a single 2–30 V supply. Its input common-mode range extends to ground, enabling direct sensing of low-side current shunts or battery voltages referenced to system ground.
Each comparator provides TTL/CMOS/MOS-compatible output sinking up to 16 mA, with low-level output voltage ≤400 mV at 4 mA sink load. Propagation delay is 1.3 µs (100 mV step, 5 mV overdrive) and supports robust noise immunity in electrically noisy environments such as factory automation I/O modules.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - Enables direct operation from 3.3 V, 5 V, 12 V, or 24 V industrial rails without regulation. |
| Input Offset Voltage (max) | ±9 mV - Ensures accurate threshold detection within ±9 mV across full temperature range (−55°C to +125°C). |
| Common-Mode Input Range | 0 V to (VCC − 2 V) - Supports ground-referenced sensing (e.g., shunt resistor monitoring) without level-shifting circuitry. |
| Output Sink Current | 16 mA - Drives standard LED indicators, optocouplers, or logic inputs directly without external buffer transistors. |
| Propagation Delay | 1.3 µs - Sufficient speed for motor overcurrent protection, power supply UVLO, and analog watchdog timing. |
| ESD Rating (HBM) | 2000 V - Meets industrial handling requirements per ANSI/ESDA/JEDEC JS-001, reducing field-failure risk during assembly. |
| Quiescent Current | 0.8–2 mA (all four comparators) - Enables low-power operation in always-on monitoring subsystems. |
Pinout & Package
LM139DR is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package measuring 8.70 mm × 3.90 mm, with standard JEDEC MS-012AC footprint and gull-wing leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - Requires external pull-up; sinks current when IN1− > IN1+. |
| 2 | IN1− | Inverting input of Comparator 1 - Accepts reference or sensed signal; common-mode range includes ground. |
| 3 | IN1+ | Non-inverting input of Comparator 1 - Used for threshold setting or signal routing in window/comparator configurations. |
| 4 | VCC | Positive supply pin - Powers all four comparators; accepts 2–30 V DC with no reverse-polarity protection. |
| 5 | OUT2 | Open-collector output of Comparator 2 - Independent output; shares no internal nodes with OUT1. |
| 6 | IN2− | Inverting input of Comparator 2 - Electrically isolated from other channels; supports multi-threshold monitoring. |
| 7 | IN2+ | Non-inverting input of Comparator 2 - Configurable for hysteresis via feedback resistor if needed. |
| 8 | GND | Ground reference - All inputs and outputs referenced to this node; must be low-impedance for stable operation. |
| 9–14 | IN3±, OUT3, IN4±, OUT4 | Inputs/outputs for Comparators 3 and 4 - Fully identical functionality to Channels 1 and 2; enables quad independent decisions. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Operates with inputs down to ground - eliminates need for level-shifters in low-side current sensing. |
| Open-collector outputs | Enable wired-OR logic, mixed-voltage interfacing (e.g., 5 V logic driving 3.3 V MCU interrupt), and flexible pull-up selection. |
| Wide supply voltage range | 2–30 V operation supports direct connection to unregulated industrial supplies or battery stacks. |
| High ESD tolerance | 2 kV HBM rating ensures robustness during PCB handling and in-field maintenance without added protection diodes. |
| Extended temperature grade | −55°C to +125°C operation qualifies LM139DR for aerospace, military, and under-hood automotive applications. |
Applications
| Overcurrent Protection in Motor Drives | Power Supply UVLO Monitoring |
|---|---|
Use Scenario: Detects excessive phase current in BLDC motor controllers using shunt resistors, triggering immediate shutdown before MOSFET failure. IC Role / Device Role / Timing Role: Quad comparator compares four independent current samples against programmable thresholds; outputs drive gate driver disable lines. Use Value: Enables fast (<2 µs response), ground-referenced current sensing without op-amp buffers or level shifters - reducing BOM count and board area. | Use Scenario: Monitors main DC bus voltage in server PSUs to prevent startup or operation below safe minimum (e.g., 10.5 V for 12 V rail). IC Role / Device Role / Timing Role: One comparator channel acts as UVLO detector; others monitor auxiliary rails or fan tach feedback. Use Value: Single SOIC-14 device replaces multiple discrete comparators - simplifying layout and improving thermal tracking between thresholds. |
| Industrial Temperature Sensor Interface | Factory Automation Limit Switching |
Use Scenario: Interfaces thermistor or RTD bridges in PLC analog input modules, converting resistance changes into digital status flags. IC Role / Device Role / Timing Role: Compares conditioned sensor voltage against fixed reference voltages to generate high/low/normal/fault states. Use Value: −55°C to +125°C guaranteed operation ensures reliable performance inside sealed enclosures with no forced air cooling. | Use Scenario: Reads mechanical limit switches and proximity sensors in CNC machines, verifying axis position before motion commands execute. IC Role / Device Role / Timing Role: Four comparators condition and debounce four independent switch inputs, feeding clean signals to FPGA or microcontroller GPIO. Use Value: Open-collector outputs interface directly with 24 V PLC backplane logic; built-in noise immunity reduces false triggers in EMI-heavy shop floors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339DR | 0°C to +70°C temp range; ±9 mV offset; 2–30 V supply; same SOIC-14 pinout. | Not qualified for extended temperature environments - unsuitable for aerospace, under-hood, or high-ambient industrial use. | Select LM339DR only for commercial-grade equipment with ambient <70°C and no long-term reliability certification requirements. |
| LM2901DR | −40°C to +125°C range; ±15 mV offset (max); 2–32 V supply; identical pinout and open-collector architecture. | Higher offset limits precision in low-differential applications (e.g., <50 mV thresholds); otherwise functionally interchangeable. | Choose LM2901DR when wider supply range (up to 32 V) is needed and ±15 mV offset is acceptable for system accuracy budget. |
Compared with LM139DR, LM339DR lacks extended temperature qualification and LM2901DR trades higher input offset for broader supply voltage support - making LM139DR the optimal choice for high-reliability, ground-sensing, wide-temperature analog monitoring where offset stability is critical.
Availability
LM139DR is available at Aetrix Electronics and suitable for industrial motor drives, server power supplies, and factory automation systems requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM139DR 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 expertise in precision signal conditioning and industrial-grade IC design.
The LM139 family was engineered for high-reliability analog decision-making in harsh environments - targeting aerospace, defense, and industrial control systems where extended temperature operation and ground-referenced input capability are mandatory.
FAQ
What is the maximum supply voltage for LM139DR?
The LM139DR supports a maximum supply voltage of 30 V, as specified in its absolute maximum ratings. This allows direct operation from common industrial rails including 24 V DC systems. Exceeding 30 V risks permanent damage, and operation above 30 V is not supported even briefly. The LM139DR datasheet confirms this limit applies across its full −55°C to +125°C operating temperature range.
Does LM139DR support ground-referenced input signals?
Yes, the LM139DR supports true ground-referenced input operation: its common-mode input voltage range extends down to 0 V (ground), enabling direct connection to low-side current shunts, battery terminals, or sensor bridges without level-shifting circuitry. This feature is explicitly guaranteed in the LM139DR datasheet's electrical characteristics table under "Common-mode input-voltage range" for both 25°C and full temperature range conditions.
What is the typical propagation delay of LM139DR?
The LM139DR has a typical propagation delay of 1.3 µs under standard test conditions (100 mV input step, 5 mV overdrive, RL = 5.1 kΩ, CL = 15 pF, VCC = 5 V, TA = 25°C). This value is confirmed in Section 6.12 ("Switching Characteristics for LM139 and LM139A") of the official Texas Instruments datasheet and remains valid across the full operating temperature range.
Can LM139DR outputs drive TTL logic directly?
Yes, LM139DR outputs are compatible with TTL logic levels. Its open-collector outputs can sink up to 16 mA while maintaining VOL ≤ 400 mV at 4 mA - well within TTL's 0.8 V low-level input threshold. When pulled up to 5 V, the LM139DR reliably drives standard 74LS and 74HC series inputs without additional buffering, as confirmed in the "Output compatible with TTL, MOS, and CMOS" feature list.
Is LM139DR pin-compatible with LM339DR?
Yes, LM139DR is fully pin-compatible with LM339DR: both use identical SOIC-14 packaging and share identical pin functions (OUT1 through OUT4, IN1± through IN4±, VCC, GND). However, LM139DR adds extended temperature qualification (−55°C to +125°C vs. 0°C to +70°C) and tighter long-term reliability testing - making it a drop-in replacement where environmental robustness is required.
LM139DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector, Open-Drain
- Voltage - Supply, Single/Dual (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 0.1µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
LM139DR FAQ
1.How can I place an order for LM139DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139DR 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 LM139DR reliable?
The price and inventory of LM139DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139DR is usually 5 days.
3.What payment methods are accepted for LM139DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139DR?
LM139DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139DR 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 LM139DR?
For technical support, including LM139DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139DR requirements.
6.How does Aetrix verify that LM139DR is sourced from the original manufacturer or authorized distributors?
All LM139DR 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 LM139DR meets industry standards.
7.What is the process for return or replacement of LM139DR?
All LM139DR units undergo pre-shipment inspection (PSI). If there is an issue with LM139DR, 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 LM139DR part is unused and in its original packaging.
Return procedure for LM139DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139DR Tags
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