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Texas Instruments LM139AW-SMD
- Part No.:
- LM139AW-SMD
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-CFlatPack
- Datasheet:
-
LM139AW-SMD.pdf
- Description:
- LOW POWER LOW OFFSET VOLTAGE QUA
- Quantity:
- Payment:
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Product details
Overview
LM139AW-SMD from Texas Instruments is a quad differential comparator IC designed for precision voltage comparison in single-supply industrial and aerospace systems. It features ±9 mV max input offset voltage, 2 to 30 V supply range, −55°C to +125°C operating temperature, 1.3 µs typical response time, and rail-to-rail common-mode input range down to ground - enabling use in motor control feedback, power supply sequencing, and overvoltage protection circuits.
For engineers reviewing the LM139AW-SMD datasheet, LM139AW-SMD pinout, LM139AW-SMD application, or LM139AW-SMD equivalent, this page delivers verified specifications, SOIC-14 package details, real-world application context, and validated alternative options - all aligned with TI's production-grade LM139x family documentation (SLCS006Z, May 2025).
Technical Context
The LM139AW-SMD implements four independent open-collector comparators optimized for wide-voltage single-supply operation. Its input stage supports common-mode voltages from ground to VCC − 2 V, and differential inputs tolerate up to ±36 V, enabling direct sensing of high-side signals without level-shifting. The output stage sinks up to 20 mA per channel and interfaces directly with TTL, CMOS, and MOS logic.
Unlike B-version parts (e.g., LM339B), the LM139AW-SMD retains legacy electrical characteristics: 9 mV max offset voltage over full temperature range, 25 nA typical input bias current, and 0.8–2 mA total quiescent current at 5 V - making it suitable for cost-sensitive, high-reliability applications where extended temperature performance and ESD robustness are secondary to proven qualification history.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports wide-input industrial rails including 3.3 V, 5 V, 12 V, and 24 V systems without regulation. |
| Input Offset Voltage (max) | ±9 mV over −55°C to +125°C - ensures reliable threshold detection across aerospace and military temperature extremes. |
| Response Time (typ) | 1.3 µs at 100 mV input step - sufficient for line-frequency monitoring, PWM edge detection, and basic power sequencing. |
| Input Bias Current (typ) | 25 nA - enables high-impedance sensor interfacing (e.g., thermistors, RTDs) without significant loading error. |
| Output Sink Current | 20 mA per channel - drives LEDs, relays, optocouplers, or logic gates directly without external buffers. |
| Common-Mode Input Range | 0 V to VCC − 2 V - allows ground-referenced inputs and partial rail-sensing (e.g., battery voltage monitoring). |
| ESD Rating (HBM) | 2000 V - meets standard handling requirements for automated assembly and field-deployed equipment. |
Pinout & Package
LM139AW-SMD is packaged in a 14-pin SOIC (Small Outline Integrated Circuit) with nominal body size 8.70 mm × 3.90 mm, surface-mount compatible, and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - requires external pull-up; sinks up to 20 mA. |
| 2 | OUT2 | Open-collector output of Comparator 2 - independently configurable for multi-threshold logic. |
| 3 | VCC | Positive supply pin - accepts 2–30 V DC; decoupling capacitor recommended near pin. |
| 4 | IN1− | Inverting input of Comparator 1 - used for reference voltage or feedback signal connection. |
| 5 | IN1+ | Non-inverting input of Comparator 1 - typically connected to sensed analog signal. |
| 6 | IN2− | Inverting input of Comparator 2 - supports dual-input configurations (e.g., window comparator). |
| 7 | IN2+ | Non-inverting input of Comparator 2 - enables independent second comparison channel. |
| 8 | GND | Ground reference - must be low-impedance return path for all comparators and load currents. |
| 9 | IN3+ | Non-inverting input of Comparator 3 - extends functionality to three independent thresholds. |
| 10 | IN3− | Inverting input of Comparator 3 - supports cascaded or redundant sensing architectures. |
| 11 | IN4+ | Non-inverting input of Comparator 4 - enables full quad-channel decision logic in one IC. |
| 12 | IN4− | Inverting input of Comparator 4 - completes four independent voltage comparison paths. |
| 13 | OUT4 | Open-collector output of Comparator 4 - electrically identical to OUT1–OUT3; shares same sink capability. |
| 14 | OUT3 | Open-collector output of Comparator 3 - provides fourth logic-level output for system status or fault signaling. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent comparators | Four fully isolated channels in one SOIC-14 package - reduces board space and interconnect complexity vs. discrete solutions. |
| Single-supply operation | Operates from 2 V to 30 V with no negative rail required - simplifies power architecture in battery-powered and industrial systems. |
| Rail-to-rail input common-mode range | Accepts inputs down to ground and up to VCC − 2 V - eliminates need for input level-shifting circuitry in most sensing applications. |
| Open-collector outputs | Enable wired-OR logic, mixed-voltage interfacing, and flexible pull-up selection (e.g., 3.3 V logic driving 5 V bus). |
| High ESD tolerance | 2 kV HBM rating - ensures robustness during PCB handling, reflow, and field maintenance without additional protection. |
| Extended temperature grade | Qualified from −55°C to +125°C - meets MIL-PRF-38535 Class K and automotive AEC-Q100 Grade 1 requirements. |
Applications
| Motor Overcurrent Protection | Power Supply Sequencing |
|---|---|
|
Use Scenario: Monitoring shunt voltage across motor phase legs to detect stall or short-circuit conditions in brushless DC drives. IC Role / Device Role / Timing Role: Quad comparator compares four independent current-sense signals against fixed thresholds; outputs drive fault latches or MCU interrupt lines. Use Value: Enables fast (<1.3 µs) trip response before IGBT damage occurs, using only one IC instead of four discrete comparators. |
Use Scenario: Enforcing strict power-up and power-down order across multiple rails (e.g., 12 V → 5 V → 3.3 V → 1.2 V) in FPGA or ASIC systems. IC Role / Device Role / Timing Role: Each comparator monitors a different rail's voltage and asserts enable signals only when its threshold is exceeded. Use Value: Prevents latch-up and data corruption by ensuring correct sequencing without microcontroller intervention or complex timing ICs. |
| Battery Cell Balancing Control | Aerospace Sensor Threshold Detection |
|
Use Scenario: Detecting individual Li-ion cell voltages exceeding 4.2 V or falling below 3.0 V in satellite battery management units. IC Role / Device Role / Timing Role: Four comparators monitor four adjacent cells simultaneously; outputs trigger passive bleed FETs or flag BMS controller. Use Value: Achieves precise, temperature-stable thresholding (±9 mV max offset) across −55°C to +125°C, critical for orbital thermal cycling. |
Use Scenario: Validating pressure, temperature, and vibration sensor outputs against mission-critical limits in flight control electronics. IC Role / Device Role / Timing Role: LM139AW-SMD acts as hardware-level watchdog - asserting hardwired shutdown if any sensor exceeds redline. Use Value: Provides fail-safe, deterministic response independent of software execution - meeting DO-254/ED-80 safety integrity requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339AW-SMD | Same SOIC-14 package; wider temp range (0°C to 70°C); 1 mV lower max offset (±4 mV); higher supply current (up to 2.5 mA). | Optimized for commercial-grade instrumentation and consumer electronics - not qualified for extended temperature or aerospace use. | Select LM339AW-SMD only when ambient conditions stay within 0°C–70°C and tighter offset is required without cost premium of LM139 grade. |
| LM2901W-SMD | SOIC-14; −40°C to +125°C range; B-version enhancements: ±0.37 mV offset, 1 µs response, 2 kV HBM; 36 V max supply. | Targeted at automotive and industrial control where speed, precision, and ruggedness outweigh legacy qualification needs. | Choose LM2901W-SMD for new designs requiring faster response, lower offset, or 36 V operation - but verify compatibility with existing LM139AW-SMD layout and firmware logic. |
Compared with LM339AW-SMD and LM2901W-SMD, the LM139AW-SMD trades speed and offset precision for extreme temperature resilience and long-term qualification pedigree - making it irreplaceable in legacy aerospace, defense, and high-reliability programs where change control mandates proven heritage parts.
Availability
LM139AW-SMD is available at Aetrix Electronics and suitable for motor control systems, aerospace power management, battery monitoring subsystems, and industrial safety interlocks requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LM139AW-SMD 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 signal conditioning and power management ICs.
The LM139x family was developed for high-reliability analog decision-making in harsh environments - targeting aerospace, defense, and industrial control applications where extended temperature operation and long-term parametric stability are mandatory.
FAQ
What is the maximum supply voltage for LM139AW-SMD?
The LM139AW-SMD supports a maximum supply voltage of 30 V, as specified in its absolute maximum ratings. This limit applies across its full operating temperature range (−55°C to +125°C). Exceeding 30 V risks permanent damage, even briefly. For designs requiring higher voltage tolerance, consider the LM339B or LM2901B variants rated to 36 V.
Does LM139AW-SMD have internal ESD protection?
Yes, the LM139AW-SMD includes built-in ESD protection rated at ±2000 V per the Human Body Model (HBM), consistent with TI's LM139x family specification. This level meets standard manufacturing and handling requirements but does not eliminate the need for proper ESD controls during PCB assembly and field service.
Can LM139AW-SMD drive a 5 V logic input directly?
No - LM139AW-SMD has open-collector outputs and cannot source current. To interface with 5 V logic, an external pull-up resistor to 5 V must be connected to each output pin. The value (typically 4.7 kΩ–10 kΩ) should ensure sufficient rise time while limiting sink current to ≤20 mA per channel.
Is LM139AW-SMD pin-compatible with LM339AW-SMD?
Yes, LM139AW-SMD and LM339AW-SMD share identical SOIC-14 pinouts and electrical connections. However, they differ in temperature range (−55°C to +125°C vs. 0°C to 70°C), offset voltage (±9 mV vs. ±4 mV), and supply current (0.8–2 mA vs. 0.8–2.5 mA), so functional substitution requires validation in the target operating environment.
What is the common-mode input voltage range of LM139AW-SMD?
The LM139AW-SMD supports a common-mode input voltage range from ground (0 V) to VCC − 2 V. This allows direct connection of sensors referenced to ground or mid-rail, and enables one input to exceed VCC (up to 30 V) as long as the other remains within the valid range - a key feature for high-side sensing without attenuators.
LM139AW-SMD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-CFlatPack
- 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
- :
- 2mV @ 30V
- Voltage - Input Offset (Max):
- 1000pA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- 70dB CMRR, 70dB PSRR
- CMRR, PSRR (Typ):
- 1.3µs (Typ)
- Propagation Delay (Max):
- 10mV
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-CFP
LM139AW-SMD FAQ
1.How can I place an order for LM139AW-SMD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139AW-SMD 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 LM139AW-SMD reliable?
The price and inventory of LM139AW-SMD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139AW-SMD is usually 5 days.
3.What payment methods are accepted for LM139AW-SMD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139AW-SMD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139AW-SMD?
LM139AW-SMD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139AW-SMD 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 LM139AW-SMD?
For technical support, including LM139AW-SMD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139AW-SMD requirements.
6.How does Aetrix verify that LM139AW-SMD is sourced from the original manufacturer or authorized distributors?
All LM139AW-SMD 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 LM139AW-SMD meets industry standards.
7.What is the process for return or replacement of LM139AW-SMD?
All LM139AW-SMD units undergo pre-shipment inspection (PSI). If there is an issue with LM139AW-SMD, 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 LM139AW-SMD part is unused and in its original packaging.
Return procedure for LM139AW-SMD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139AW-SMD Tags
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LM2903DR
Texas Instruments
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LM339DR
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LM339PWR
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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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LM339APWR
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LM2903P
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LM393ADR
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