My Inquiry
My Account
Texas Instruments LM139AW
- Part No.:
- LM139AW
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-CFlatPack
- Datasheet:
-
LM139AW.pdf
- Description:
- QUAD DIFFERENTIAL COMPARATOR 14-
- Quantity:
- Payment:
- Shipping:
Inventory:3,196
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM139AW from Texas Instruments is a quad differential comparator designed for high-reliability military and aerospace applications, operating across –55°C to +125°C with ±30V supply capability, 9mV max input offset voltage, and rail-to-rail common-mode input range down to ground. It serves as the precision analog decision element in power supply supervision, motor overcurrent detection, and fault-sensing circuits.
For engineers reviewing the LM139AW datasheet, LM139AW pinout, LM139AW application, or LM139AW equivalent, this page delivers verified electrical specs, SOIC-14 package details, temperature-grade validation, and drop-in alternatives for legacy industrial and defense designs requiring extended thermal resilience.
Technical Context
The LM139AW implements four independent open-collector comparators with input stages tolerant of differential voltages up to ±30V and common-mode inputs extending from ground to VCC – 2V. Its architecture supports single-supply operation from 2V to 30V while maintaining stable quiescent current (0.8–2mA) across voltage and temperature.
Each comparator features TTL/CMOS/MOS-compatible output sinking up to 16mA, low input bias current (±100nA max), and propagation delay of 1.3µs (100mV step, 5mV overdrive). No internal compensation is required, enabling direct integration into fast-response threshold-detection loops.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2V to 30V - Enables direct use with 3.3V, 5V, 12V, and 24V system rails without level-shifting. |
| Input Offset Voltage (max) | ±9mV over full –55°C to +125°C range - Ensures reliable threshold detection in wide-temperature environments. |
| Common-Mode Input Range | 0V to VCC – 2V - Supports ground-referenced sensing and high-side monitoring without external resistive dividers. |
| Output Sink Current | 16mA per channel - Drives LEDs, relay coils, or logic inputs directly without external buffers. |
| Propagation Delay | 1.3µs (100mV input step, 5mV overdrive) - Suitable for sub-1MHz window-comparator and overvoltage latch applications. |
| Quiescent Supply Current | 0.8–2mA total (four comparators) - Minimizes standby power in battery-backed or energy-constrained systems. |
| ESD Rating (HBM) | 2000V - Meets standard handling requirements for production assembly without special ESD controls. |
Pinout & Package
LM139AW is supplied in a 14-pin SOIC (D) package measuring 8.70mm × 3.90mm, with standard JEDEC MS-012AC footprint and 1.27mm pitch. Pin 1 is marked by a beveled corner or dot; pin numbering follows counterclockwise convention when viewing top side.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector NPN output - Requires external pull-up to define logic-high level and sink current up to 16mA. |
| 2 (IN1–) | Comparator 1 inverting input | Differential input node - Accepts signals down to ground; tolerates up to VCC + 0.3V without damage. |
| 3 (IN1+) | Comparator 1 non-inverting input | Differential input node - Matches IN1– in voltage range and ESD robustness; used for reference or signal comparison. |
| 4 (OUT2) | Comparator 2 output | Open-collector NPN output - Electrically identical to OUT1; enables independent control of two downstream loads. |
| 5 (IN2–) | Comparator 2 inverting input | Differential input node - Fully isolated from IN1 pins; supports separate sensing channels. |
| 6 (IN2+) | Comparator 2 non-inverting input | Differential input node - Paired with IN2–; no crosstalk with other comparator inputs. |
| 7 (VCC) | Positive supply | Main power rail - Supplies all four comparators; decoupling capacitor (0.1µF) recommended at pin. |
| 8 (GND) | Negative supply / reference | System ground return - Serves as current sink path for all outputs and reference for input common-mode range. |
| 9 (IN3+) | Comparator 3 non-inverting input | Differential input node - Third independent sensing channel; identical electrical characteristics to IN1+/IN2+. |
| 10 (IN3–) | Comparator 3 inverting input | Differential input node - Paired with IN3+; supports three-way threshold monitoring. |
| 11 (OUT3) | Comparator 3 output | Open-collector NPN output - Provides third independent logic-level output with same drive capability as OUT1/OUT2. |
| 12 (IN4+) | Comparator 4 non-inverting input | Differential input node - Fourth sensing channel; completes full quad functionality. |
| 13 (IN4–) | Comparator 4 inverting input | Differential input node - Final input pair; enables four simultaneous comparisons (e.g., dual over/under-voltage windows). |
| 14 (OUT4) | Comparator 4 output | Open-collector NPN output - Final output channel; supports redundant fault signaling or multi-zone monitoring. |
Key Features
| Feature | Design Value |
|---|---|
| Extended temperature range | –55°C to +125°C operation - Qualified for MIL-PRF-38535 Class K and space-grade applications where commercial-grade parts fail. |
| Rail-to-rail input capability | Common-mode range includes ground and extends to VCC – 2V - Eliminates need for input biasing networks in single-supply systems. |
| High differential input voltage tolerance | ±30V maximum - Allows direct connection to unregulated bus voltages or transformer-coupled signals without attenuation. |
| Open-collector outputs | 16mA sink per channel with 700mV max saturation voltage - Interfaces natively with 3.3V/5V/12V logic families and drives discrete loads directly. |
| Low input bias current | ±100nA maximum - Minimizes error in high-impedance sensor interfaces (e.g., thermistors, photodiodes) and precision voltage dividers. |
Applications
| Power Supply Supervision | Motor Overcurrent Protection |
|---|---|
Use Scenario: Monitoring +12V, +5V, and +3.3V rails in a ruggedized server PSU to trigger shutdown on undervoltage or overvoltage events. IC Role / Device Role / Timing Role: Quad comparator acts as independent voltage window detector for each rail, with outputs wired to a priority encoder or FPGA interrupt controller. Use Value: Enables deterministic fault response within 1.3µs, meeting IEC 62368-1 safety timing requirements for Class II equipment. | Use Scenario: Detecting phase current exceedance in a 3-phase BLDC motor drive using shunt resistor feedback. IC Role / Device Role / Timing Role: Two comparators monitor high-side and low-side shunt voltages; third and fourth generate latched fault flags via cross-coupled SR latches. Use Value: Delivers <1.5µs overcurrent trip latency, preventing IGBT destruction during short-circuit transients. |
| Avionics Sensor Interface | Industrial PLC Input Conditioning |
Use Scenario: Converting analog pressure and temperature sensor outputs (0–5V) into discrete status signals for flight control computers. IC Role / Device Role / Timing Role: Each comparator compares sensor voltage against fixed thresholds (e.g., "low pressure", "high temp") and drives ARINC 429-compatible optocouplers. Use Value: Guaranteed operation at –55°C ensures reliability during cold-soak startup and high-altitude cruise conditions. | Use Scenario: Digitizing 0–10V analog inputs from field transmitters in a DIN-rail mounted PLC module operating in factory ambient (–25°C to +70°C). IC Role / Device Role / Timing Role: Four comparators convert four independent analog channels into 24V logic-level digital inputs compatible with PLC backplane bus drivers. Use Value: ±30V input tolerance allows direct connection to noisy industrial wiring without protection diodes or RC filters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339AW | Same SOIC-14 package and –55°C to +125°C rating, but ±36V supply and ±9mV offset (vs. ±30V/±9mV for LM139AW); higher ESD (2kV HBM) and lower typical input bias current (25nA vs. 100nA). | Preferred for newer designs requiring wider supply headroom or lower power consumption; not qualified to MIL-PRF-38535 Class K. | Select LM339AW if supply voltage may exceed 30V or if lower input bias current improves sensor accuracy. |
| LM2901W | SOIC-14, –40°C to +125°C, ±36V supply, ±5.5mV offset (B-version), 3.5nA typical input bias current, 1µs response time. | Optimized for automotive and industrial control; lacks military-grade screening but offers superior offset and speed. | Choose LM2901W for cost-sensitive automotive ECUs or industrial HMIs where extended temperature is sufficient and faster response is critical. |
Compared with LM339AW and LM2901W, the LM139AW provides the widest operational temperature envelope (–55°C to +125°C) and legacy qualification pedigree for defense programs, while trading off some speed and offset performance for proven reliability under extreme thermal cycling and radiation exposure.
Availability
LM139AW is available at Aetrix Electronics and suitable for power supply supervision, motor protection, avionics interface, and industrial PLC input conditioning requiring stable component supply across extended temperature and long product lifecycles.
Supply support for LM139AW 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 and embedded processing solutions for industrial, automotive, and aerospace markets.
The LM139AW belongs to TI's legacy precision comparator family, engineered specifically for high-reliability applications demanding extended temperature operation, military-grade screening, and long-term supply assurance in mission-critical systems.
FAQ
What is the maximum supply voltage for LM139AW?
The LM139AW supports a maximum supply voltage of 30V, as specified in its absolute maximum ratings. This limit applies to the difference between VCC and GND pins. Exceeding 30V risks permanent device damage. The part operates reliably from 2V to 30V, making it suitable for 3.3V, 5V, 12V, and 24V systems. Always observe derating guidelines for sustained high-temperature operation.
Does LM139AW support rail-to-rail input operation?
Yes, the LM139AW supports rail-to-rail input operation in the sense that its common-mode input voltage range extends from ground (0V) to VCC – 2V. This allows direct connection of sensors referenced to ground or to the positive rail without external level-shifting circuitry. However, inputs must not go more than 0.3V below ground to avoid incorrect output states or excessive input current.
What is the guaranteed input offset voltage specification for LM139AW over temperature?
The LM139AW guarantees a maximum input offset voltage of ±9mV across its full operating temperature range of –55°C to +125°C. This value is confirmed in the "Electrical Characteristics for LM139 and LM139A" section of the datasheet (Section 6.9), where full-range testing is explicitly defined for both LM139 and LM139A variants.
Can LM139AW outputs drive a 5V logic input directly?
Yes, LM139AW outputs can drive a 5V logic input directly when used with an appropriate external pull-up resistor (e.g., 4.7kΩ to 5V). As an open-collector device, LM139AW sinks current to ground when active; the pull-up defines the logic-high voltage. Its 16mA sink capability exceeds standard TTL and CMOS input current requirements, ensuring noise-immune switching even with moderate capacitive loads.
Is LM139AW pin-compatible with LM339 or LM2901?
Yes, LM139AW is pin-compatible with LM339, LM2901, and other members of the LMx39 family in the SOIC-14 (D) package. All share identical pin configuration (Figure 5-1), including VCC, GND, four independent input pairs, and four open-collector outputs. However, differences in temperature range, offset voltage, and supply limits mean functional substitution requires verification against the target application's voltage and thermal constraints.
LM139AW 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 @ 5V
- Voltage - Input Offset (Max):
- 0.1µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 300ns (Typ)
- Propagation Delay (Max):
- -
- Hysteresis:
- -55°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-CFP
LM139AW FAQ
1.How can I place an order for LM139AW through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139AW 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 reliable?
The price and inventory of LM139AW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139AW is usually 5 days.
3.What payment methods are accepted for LM139AW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139AW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139AW?
LM139AW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139AW 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?
For technical support, including LM139AW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139AW requirements.
6.How does Aetrix verify that LM139AW is sourced from the original manufacturer or authorized distributors?
All LM139AW 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 meets industry standards.
7.What is the process for return or replacement of LM139AW?
All LM139AW units undergo pre-shipment inspection (PSI). If there is an issue with LM139AW, 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 part is unused and in its original packaging.
Return procedure for LM139AW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139AW Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
