My Inquiry
My Account
Texas Instruments LM139ADG4
- Part No.:
- LM139ADG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM139ADG4.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,792
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM139ADG4 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, 2–30 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. It is used in overvoltage protection circuits for satellite power subsystems.
For engineers reviewing the LM139ADG4 datasheet, LM139ADG4 pinout, LM139ADG4 application, or LM139ADG4 equivalent, this page delivers verified specifications, SOIC-14 package details, real-world use cases in harsh-environment electronics, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM139ADG4 implements four independent open-collector comparators with inputs capable of operating at ground potential and outputs compatible with TTL, MOS, and CMOS logic families. Its input stage supports differential voltages up to ±36 V and common-mode voltages from (V−) to (V+) − 2 V.
It draws 0.8–2 mA total quiescent current across its 2–30 V supply range and delivers 6–16 mA sink capability per output. The device lacks internal hysteresis and requires external feedback for noise immunity in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports wide-input industrial rails without external regulation |
| Input Offset Voltage (max) | ±9 mV over full temperature range - sets minimum detectable voltage difference in precision threshold detection |
| Response Time (typ) | 1.3 µs at 100 mV input step - enables fast fault response in overvoltage/undervoltage monitoring |
| Common-Mode Input Range | 0 V to VCC − 2 V - allows direct sensing of signals referenced to ground in single-supply systems |
| Output Sink Current (min) | 6 mA per channel - drives standard pull-up resistors and logic inputs without buffering |
| Operating Temperature | −55°C to +125°C - qualified for military, aerospace, and extended-temperature industrial applications |
| ESD Rating (HBM) | 2000 V - meets baseline robustness for handling and board-level assembly |
Pinout & Package
LM139ADG4 is housed 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) | Comparator 1 output | Open-collector output requiring external pull-up; sinks current when IN1− > IN1+ |
| 2 (IN1−) | Comparator 1 inverting input | Accepts reference or sensed signal; common-mode range extends to ground |
| 3 (IN1+) | Comparator 1 non-inverting input | Accepts reference or sensed signal; supports same common-mode range as IN1− |
| 4 (VCC) | Positive supply | Single supply connection; no negative rail required |
| 5 (OUT2) | Comparator 2 output | Independent open-collector output; electrically isolated from OUT1 |
| 6 (IN2−) | Comparator 2 inverting input | Matches IN1− electrical behavior; usable for dual-threshold or window comparisons |
| 7 (IN2+) | Comparator 2 non-inverting input | Matches IN1+ behavior; supports differential or single-ended configurations |
| 8 (IN3−) | Comparator 3 inverting input | Third independent input pair; identical specs to IN1−/IN2− |
| 9 (IN3+) | Comparator 3 non-inverting input | Third independent input pair; identical specs to IN1+/IN2+ |
| 10 (IN4−) | Comparator 4 inverting input | Fourth independent input pair; enables multi-channel monitoring in one IC |
| 11 (IN4+) | Comparator 4 non-inverting input | Fourth independent input pair; supports redundancy or parallel sensing |
| 12 (GND) | Negative supply / reference | System ground return; all inputs and outputs referenced to this node |
| 13 (OUT4) | Comparator 4 output | Final open-collector output; shares same drive strength and timing as other outputs |
| 14 (OUT3) | Comparator 3 output | Third open-collector output; fully decoupled from other channels |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent comparators | Enables simultaneous monitoring of four separate voltage thresholds in space-constrained designs |
| Ground-sensing input stage | Allows direct interface with 0 V-referenced sensors or battery terminals without level-shifting |
| Open-collector outputs | Permits wired-OR logic, mixed-voltage interfacing, and flexible pull-up selection (e.g., 3.3 V or 5 V) |
| Wide supply range (2–30 V) | Eliminates need for dedicated bias rails in 12 V, 24 V, or 28 V avionics and industrial control systems |
| −55°C to +125°C operation | Supports deployment in unheated satellite bays, engine compartments, and outdoor infrastructure |
Applications
| Overvoltage Protection | Power Sequencing Control |
|---|---|
|
Use Scenario: Monitoring DC bus voltage in a satellite power distribution unit to trigger shutdown if exceeding 32 V. IC Role / Device Role / Timing Role: LM139ADG4 compares bus voltage against a precision 32 V reference; outputs drive latch circuitry within 1.3 µs. Use Value: Prevents damage to downstream 28 V-rated converters by detecting overvoltage before capacitor stress exceeds rating. |
Use Scenario: Enabling sequential turn-on of FPGA, memory, and analog subsystems after main 12 V rail stabilizes. IC Role / Device Role / Timing Role: LM139ADG4 channels monitor individual rail voltages and assert enable signals only when all reach valid thresholds. Use Value: Eliminates sequencing ICs and reduces BOM count while maintaining strict ramp-time compliance per MIL-STD-704F. |
| Motor Phase Monitoring | Thermal Trip Detection |
|
Use Scenario: Detecting loss of phase in a three-phase brushless DC motor driver using back-EMF zero-crossing signals. IC Role / Device Role / Timing Role: LM139ADG4 compares each phase's filtered back-EMF against mid-rail; outputs feed microcontroller interrupt pins. Use Value: Enables real-time fault detection with <2 µs latency, supporting IEC 61800-5-2 functional safety requirements. |
Use Scenario: Tripping a solid-state relay when thermistor voltage crosses threshold indicating >105°C heatsink temperature. IC Role / Device Role / Timing Role: LM139ADG4 compares thermistor divider output to stable reference; output directly drives SSR gate. Use Value: Provides fail-safe thermal cutoff without software dependency, meeting UL 60730 Class A requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339ADR | Wider temp range (0°C to 70°C), higher max offset (±9 mV), same SOIC-14 package | Not rated for −55°C operation; unsuitable for space or extended-temperature military use | Select LM339ADR only for commercial-grade cost-sensitive applications where full military temp range is unnecessary |
| LM2901DR | −40°C to +125°C range, lower max offset (±15 mV), same pinout and SOIC-14 package | Higher offset increases threshold uncertainty; acceptable for non-precision industrial controls | Choose LM2901DR when extended low-temp performance is not required but automotive-grade reliability is needed |
Compared with LM139ADG4, LM339ADR sacrifices military temperature qualification for lower cost, while LM2901DR trades offset accuracy for broader automotive qualification-neither offers the −55°C start-up capability critical for launch-critical systems.
Availability
LM139ADG4 is available at Aetrix Electronics and suitable for overvoltage protection, power sequencing control, motor phase monitoring, and thermal trip detection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM139ADG4 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 company specializing in analog and embedded processing technologies, with leadership in high-reliability analog ICs for aerospace, defense, and industrial markets.
The LM139 family was designed for precision voltage comparison in harsh-environment systems requiring guaranteed operation from −55°C to +125°C, including satellite power management, avionics monitoring, and military vehicle electronics.
FAQ
What is the maximum supply voltage for LM139ADG4?
The LM139ADG4 supports a maximum supply voltage of 30 V, as specified in its Absolute Maximum Ratings table. Operation above this level risks permanent damage. This 30 V limit applies across its full −55°C to +125°C operating temperature range and is distinct from the 36 V rating of the newer LM339B variant. Always maintain at least 0.3 V margin below 30 V in design margins.
Does LM139ADG4 include internal hysteresis?
No, the LM139ADG4 does not include internal hysteresis. Its comparator inputs are purely differential with no built-in positive feedback. To prevent oscillation near threshold due to noise, external hysteresis must be added via resistor feedback from output to non-inverting input. Typical values range from 100 kΩ to 1 MΩ depending on required hysteresis voltage and source impedance.
Can LM139ADG4 inputs operate below ground potential?
No, LM139ADG4 inputs must remain within −0.3 V to (VCC − 1.5 V) under normal operation. Input voltages below −0.3 V relative to GND can cause incorrect output states and excessive input current flow. The device is not designed for true bipolar input operation; for sub-ground sensing, level-shifting circuitry or a rail-to-rail input comparator like TLV3701 is required.
What is the output configuration of LM139ADG4?
The LM139ADG4 features four independent open-collector NPN transistor outputs. Each output requires an external pull-up resistor to a defined logic-high voltage (e.g., 3.3 V or 5 V). This configuration enables wired-OR logic, mixed-voltage interfacing, and direct driving of LEDs or relays. No internal pull-up is present, and outputs cannot source current.
Is LM139ADG4 RoHS compliant and lead-free?
Yes, LM139ADG4 is RoHS compliant and lead-free, as confirmed by Texas Instruments' official packaging and environmental data. The "DG4" suffix denotes a 14-pin SOIC package with lead-free matte tin finish and halogen-free molding compound, meeting IPC/JEDEC J-STD-020 moisture sensitivity level 3 and JEDEC JS-001 ESD classification.
LM139ADG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- 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
LM139ADG4 FAQ
1.How can I place an order for LM139ADG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM139ADG4 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 LM139ADG4 reliable?
The price and inventory of LM139ADG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM139ADG4 is usually 5 days.
3.What payment methods are accepted for LM139ADG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM139ADG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM139ADG4?
LM139ADG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM139ADG4 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 LM139ADG4?
For technical support, including LM139ADG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM139ADG4 requirements.
6.How does Aetrix verify that LM139ADG4 is sourced from the original manufacturer or authorized distributors?
All LM139ADG4 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 LM139ADG4 meets industry standards.
7.What is the process for return or replacement of LM139ADG4?
All LM139ADG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM139ADG4, 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 LM139ADG4 part is unused and in its original packaging.
Return procedure for LM139ADG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM139ADG4 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…
