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Texas Instruments LM139ADR
- Part No.:
- LM139ADR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM139ADR.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,658
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Product details
Overview
LM139ADR from Texas Instruments is a quad differential comparator IC designed for precision voltage comparison in wide-supply industrial and aerospace systems. It operates from 2V to 30V, delivers ±9mV max input offset voltage (25°C), supports –55°C to +125°C temperature range, features open-collector outputs compatible with TTL/MOS/CMOS, and is used in motor control feedback, power supply sequencing, and overvoltage protection circuits.
For engineers reviewing the LM139ADR datasheet, LM139ADR pinout, LM139ADR application, or LM139ADR equivalent, this page provides verified specifications, SOIC-14 package details, real-world use scenarios, and two confirmed alternative comparators - all validated against TI's SLCS006Z datasheet (May 2025 revision).
Technical Context
The LM139ADR implements four independent high-gain comparators with rail-to-rail common-mode input range down to ground and differential input capability up to ±36V. Its open-collector output stage allows flexible pull-up configuration and direct interface with logic families across varying supply domains.
It uses bipolar process technology optimized for stability under wide VCC variation (2–30V) and extreme temperature operation (–55°C to +125°C), with quiescent current independent of supply voltage and no internal phase compensation required for basic comparator operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 30V - enables single-supply operation in 3.3V, 5V, 12V, and 24V industrial systems without level-shifting. |
| Input Offset Voltage (max) | ±9mV at 25°C - ensures reliable detection of small analog differences (e.g., 10mV threshold sensing) without calibration. |
| Common-Mode Input Range | 0V to VCC – 1.5V - supports direct ground-referenced sensing and compatibility with low-side current shunt monitoring. |
| Output Type | Open-collector - permits wired-OR logic, mixed-voltage interfacing (e.g., 3.3V logic driving 5V pull-up), and direct connection to LEDs or relays. |
| Quiescent Current (4 comp.) | 0.8–2mA - enables low-power operation in battery-backed or energy-constrained subsystems like UPS status monitors. |
| Response Time (typ) | 1.3µs - suitable for medium-speed control loops such as fan speed regulation or DC-DC converter fault detection. |
| ESD Rating (HBM) | 2000V - meets standard handling requirements for manufacturing and field service in industrial environments. |
Pinout & Package
LM139ADR is supplied in a 14-pin SOIC (Small Outline Integrated Circuit) package with nominal body size 8.70mm × 3.90mm and standard JEDEC MS-012AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector output requiring external pull-up; sinks current when comparator 1 inputs satisfy IN+ > IN−. |
| 2 (IN1−) | Comparator 1 inverting input | Negative reference or feedback node; accepts voltages from GND to VCC − 1.5V. |
| 3 (IN1+) | Comparator 1 non-inverting input | Sense or signal input; same voltage range as IN1−; determines output state relative to IN1−. |
| 4 (VCC) | Positive supply | Single positive rail (2–30V); powers all four comparators; no separate ground pin required for biasing. |
| 5 (OUT2) | Comparator 2 output | Independent open-collector output; electrically isolated from OUT1 but shares VCC and GND. |
| 6 (IN2−) | Comparator 2 inverting input | Second independent comparator input pair; identical electrical specs to IN1−/IN1+. |
| 7 (IN2+) | Comparator 2 non-inverting input | Paired with IN2−; supports differential or single-ended configurations per channel. |
| 8 (GND) | Negative supply / reference | System ground return; defines 0V reference for all inputs and output sink paths. |
| 9 (IN3+) | Comparator 3 non-inverting input | Third channel positive input; enables multi-threshold monitoring (e.g., under/over/normal voltage windows). |
| 10 (IN3−) | Comparator 3 inverting input | Third channel negative input; matches IN1−/IN2− specs and layout routing conventions. |
| 11 (IN4+) | Comparator 4 non-inverting input | Fourth independent sense input; supports redundant or cascaded decision logic in safety-critical designs. |
| 12 (IN4−) | Comparator 4 inverting input | Final comparator input; completes quad-channel set for simultaneous multi-condition evaluation. |
| 13 (OUT4) | Comparator 4 output | Last open-collector output; routed separately to avoid contention with other outputs in OR-ed alarm schemes. |
| 14 (OUT3) | Comparator 3 output | Third output terminal; maintains consistent pin order (OUT1, OUT2, OUT3, OUT4) across all SOIC variants. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Operates with inputs down to GND and up to VCC − 1.5V - eliminates need for input biasing resistors in single-supply sensor interfaces. |
| Open-collector outputs | Supports mixed-voltage logic interfacing and wired-OR alarm buses - simplifies integration into legacy 5V or modern 3.3V control systems. |
| Wide temperature range (–55°C to +125°C) | Qualified for aerospace, military, and under-hood automotive applications where extended thermal reliability is mandatory. |
| Low input bias current (–25nA typ) | Minimizes loading on high-impedance sources like thermistors or photodiode amplifiers - preserves signal integrity in precision sensing. |
| High differential input voltage rating (±36V) | Withstands transient overvoltages beyond supply rails - protects against inductive kickback or ESD events in motor drive or power conversion stages. |
Applications
| Motor Drive Protection | Industrial Power Supply Monitoring |
|---|---|
Use Scenario: Detect overcurrent via shunt voltage and disable gate drivers during fault conditions in BLDC motor controllers. IC Role / Device Role / Timing Role: Quad comparator performs simultaneous high-side and low-side current limit, bus overvoltage, and thermal warning checks. Use Value: Enables sub-2µs fault response using dedicated channels - prevents IGBT destruction during short-circuit events. | Use Scenario: Monitor multiple DC rails (12V, 5V, 3.3V) in server PSUs to trigger shutdown before downstream logic corruption occurs. IC Role / Device Role / Timing Role: Each comparator independently compares a rail voltage against a precision reference to assert individual fault flags. Use Value: Delivers deterministic, latchable fault signaling without microcontroller intervention - improves system safety and uptime. |
| Aerospace Avionics Sequencing | Factory Automation Sensor Interface |
Use Scenario: Validate power-on reset timing and verify regulated supply stability before enabling flight control processors in UAVs. IC Role / Device Role / Timing Role: LM139ADR compares delayed and undelayed supply rails to generate synchronized enable signals with defined hold-off windows. Use Value: Guarantees strict power sequencing compliance per DO-254 requirements - avoids FPGA configuration failures or memory corruption. | Use Scenario: Convert analog outputs from pressure, temperature, and proximity sensors into digital ON/OFF signals for PLC input modules. IC Role / Device Role / Timing Role: Acts as programmable threshold detector with adjustable hysteresis via external feedback resistors. Use Value: Replaces discrete transistor comparators with guaranteed offset and temperature stability - reduces BOM count and calibration effort. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339ADR | Lower temperature grade (0°C to 70°C), higher max offset (±9mV), same SOIC-14 package and pinout. | Restricted to commercial-grade equipment; unsuitable for aerospace or extended-temperature industrial deployments. | Select LM339ADR only for cost-sensitive, non-critical applications where ambient operating temperature stays within 0–70°C. |
| LM2901DR | Extended temp range (–40°C to +125°C), lower offset (±7mV max), identical SOIC-14 footprint and function. | Better suited for automotive under-hood or industrial edge computing where tighter offset and wider cold-start margin are needed. | Choose LM2901DR when upgrading from LM139ADR for improved accuracy and broader low-temperature operation without PCB changes. |
Compared with LM339ADR and LM2901DR, the LM139ADR uniquely supports –55°C operation and aerospace qualification (via LM139-SP derivative), making it the only option among the three for cryogenic or space-grade thermal profiles - while retaining full functional and pin compatibility.
Availability
LM139ADR is available at Aetrix Electronics and suitable for motor drive protection, industrial power supply monitoring, aerospace avionics sequencing, and factory automation sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM139ADR 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 delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and communications markets.
The LM139x family was engineered for high-reliability, wide-temperature analog signal conditioning - specifically targeting aerospace, defense, and mission-critical industrial systems where extended thermal performance and long-term parametric stability are essential.
FAQ
What is the maximum supply voltage for LM139ADR?
The LM139ADR supports a maximum supply voltage of 30V, as specified in its Absolute Maximum Ratings table. This rating applies to the difference between VCC and GND pins. Exceeding 30V risks permanent damage, even if within the ±36V differential input voltage limit. Operation at 30V is validated across the full –55°C to +125°C temperature range per TI's SLCS006Z datasheet.
Does LM139ADR have rail-to-rail input capability?
The LM139ADR features a common-mode input voltage range from GND to VCC – 1.5V, enabling true rail-to-rail operation down to ground. While the upper limit stops 1.5V below VCC, either input can safely exceed VCC (up to 30V) without damage, and the comparator will still produce correct output as long as the other input remains within the valid common-mode window. This design supports direct interface with high-side shunt monitors and overvoltage detection circuits.
What is the typical response time of LM139ADR?
The LM139ADR has a typical response time of 1.3µs under standard test conditions (100mV input step, 5mV overdrive, RL = 5.1kΩ to 5V, CL = 15pF). This value is measured from input transition to output crossing 1.4V. Response remains stable across temperature (–55°C to +125°C) and supply voltage (2–30V), making it suitable for real-time fault detection in power electronics and motor control systems.
Can LM139ADR outputs be wire-OR'd together?
Yes, LM139ADR outputs are open-collector and fully compatible with wired-OR configurations. All four outputs share the same GND reference and can be connected to a single pull-up resistor and node to implement priority-encoded alarms or multi-source interrupt lines. No additional buffering or isolation is required, provided total sink current remains within the 20mA per-output absolute maximum rating and cumulative thermal limits of the package.
Is LM139ADR pin-compatible with LM339ADR?
Yes, LM139ADR is pin-compatible with LM339ADR in the SOIC-14 package: both share identical pin numbering, functions, and footprint. However, LM139ADR offers a wider operating temperature range (–55°C to +125°C vs. 0°C to +70°C) and is qualified for aerospace applications, whereas LM339ADR is intended for commercial use. Electrical parameters including offset voltage and response time are closely matched, enabling drop-in replacement where environmental requirements permit.
LM139ADR 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
- :
- 2mV @ 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
LM139ADR FAQ
1.How can I place an order for LM139ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139ADR 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 LM139ADR reliable?
The price and inventory of LM139ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139ADR is usually 5 days.
3.What payment methods are accepted for LM139ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139ADR?
LM139ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139ADR 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 LM139ADR?
For technical support, including LM139ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139ADR requirements.
6.How does Aetrix verify that LM139ADR is sourced from the original manufacturer or authorized distributors?
All LM139ADR 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 LM139ADR meets industry standards.
7.What is the process for return or replacement of LM139ADR?
All LM139ADR units undergo pre-shipment inspection (PSI). If there is an issue with LM139ADR, 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 LM139ADR part is unused and in its original packaging.
Return procedure for LM139ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139ADR Tags
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