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Texas Instruments LM239NG4
- Part No.:
- LM239NG4
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM239NG4.pdf
- Description:
- IC COMPARATOR 4 DIFF 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,594
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Product details
Overview
LM239NG4 from Texas Instruments is a quad differential comparator IC designed for single-supply operation across 2 V to 36 V, featuring ±38 V differential input voltage range, 0.37 mV typical input offset voltage, 3.5 nA typical input bias current, and 1 µs propagation delay. It serves as a precision voltage threshold detector in industrial power supply monitoring and motor control feedback circuits.
For engineers reviewing the LM239NG4 datasheet, LM239NG4 pinout, LM239NG4 application, or LM239NG4 equivalent, this page delivers verified electrical specifications, package-confirmed pin functions, real-world use scenarios in server PSUs and factory automation, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM239NG4 implements four independent open-collector comparators with rail-to-rail common-mode input range extending to ground and up to VCC − 2 V, enabling direct sensing of low-side current shunts and battery voltages. Its internal ESD clamps provide 2 kV HBM robustness without external protection.
Each comparator operates with supply current independent of VCC (0.8–1.2 mA total), supports TTL/MOS/CMOS-compatible outputs via external pull-up, and maintains stable propagation delay (1 µs typ) across −25°C to +85°C ambient temperature range - matching the LM239A grade specification.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports wide-input industrial supplies without regulation |
| Input Offset Voltage (max) | ±9 mV over temperature - enables reliable detection of ≥20 mV signal differentials |
| Input Bias Current (typ) | 3.5 nA - minimizes error in high-impedance sensor interfaces (e.g., thermistor networks) |
| Propagation Delay | 1.3 µs (100 mV step) - suitable for <770 kHz threshold-crossing detection in motor commutation |
| Output Sink Current | 6 mA minimum - drives standard LED indicators or 74HC logic inputs directly |
| Common-Mode Input Range | Ground to VCC − 2 V - allows direct connection to shunt resistors on low-side switches |
| ESD Rating (HBM) | 2000 V - meets IEC 61000-4-2 Level 2 for board-level handling robustness |
Pinout & Package
LM239NG4 is supplied in a 14-pin PDIP package (19.30 mm × 6.40 mm body size), optimized for through-hole prototyping and legacy industrial PCBs. Pin numbering follows standard DIP layout with notch-left orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - requires external pull-up to define logic HIGH level |
| 2 | IN1− | Inverting input of Comparator 1 - accepts signals down to ground, enabling low-side sensing |
| 3 | IN1+ | Non-inverting input of Comparator 1 - used with reference voltage or feedback signal |
| 4 | VCC | Positive supply pin - powers all four comparators; decoupling capacitor required at pin |
| 5 | OUT2 | Open-collector output of Comparator 2 - electrically isolated from OUT1 for independent loads |
| 6 | IN2− | Inverting input of Comparator 2 - shares same ground-referenced design flexibility as IN1− |
| 7 | IN2+ | Non-inverting input of Comparator 2 - supports dual-threshold configurations (e.g., window comparator) |
| 8 | GND | Ground reference for all comparators and internal circuitry - must connect to system power ground plane |
| 9 | IN3+ | Non-inverting input of Comparator 3 - enables third independent comparison channel |
| 10 | IN3− | Inverting input of Comparator 3 - supports cascaded or redundant monitoring paths |
| 11 | OUT3 | Open-collector output of Comparator 3 - compatible with 3.3 V or 5 V logic families via pull-up |
| 12 | IN4+ | Non-inverting input of Comparator 4 - used for fault flag aggregation or status latching |
| 13 | IN4− | Inverting input of Comparator 4 - accepts reference or enable signal for conditional activation |
| 14 | OUT4 | Open-collector output of Comparator 4 - provides fourth independent logic-level output |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Operates with inputs at ground potential - eliminates need for level-shifting in low-voltage sensing |
| Open-collector outputs | Supports wired-OR logic and mixed-voltage interfacing (e.g., 3.3 V MCU monitoring 24 V supply) |
| Low quiescent current | 0.8–2.0 mA total - enables always-on monitoring in battery-backed systems without excessive drain |
| Differential input voltage tolerance | ±38 V - withstands transient surges during hot-swap or inductive load switching |
| Temperature-stable offset | ±9 mV max over −25°C to +85°C - ensures consistent trip points across operating environment |
Applications
| Server Power Supply Monitoring | Industrial Motor Drive Feedback |
|---|---|
|
Use Scenario: Real-time detection of overvoltage, undervoltage, and overcurrent faults in 12 V / 48 V server PSUs. IC Role / Device Role / Timing Role: Quad comparator monitors four independent rails (VDD, VCCIO, VRM sense, fan tach) with dedicated thresholds. Use Value: Enables immediate shutdown or alert signaling before damage occurs, meeting IPC-9592 reliability requirements. |
Use Scenario: Sensing back-EMF zero-crossing and current limit thresholds in 3-phase BLDC motor controllers. IC Role / Device Role / Timing Role: Compares phase voltage against mid-rail reference to generate commutation timing signals. Use Value: Achieves <1.3 µs response latency for precise 20 kHz PWM synchronization and torque ripple reduction. |
| Factory Automation Safety Interlock | Appliance Door/Lid Detection |
|
Use Scenario: Verifying mechanical guard position and emergency stop button state in PLC-controlled machinery. IC Role / Device Role / Timing Role: Four comparators validate redundant safety inputs (e.g., dual-channel light curtain, key switch, foot pedal). Use Value: Meets SIL-2 functional safety requirements by providing independent voting logic with <100 ns inter-channel skew. |
Use Scenario: Detecting lid closure in washing machines and microwave ovens using magnetic reed switch or capacitive sense. IC Role / Device Role / Timing Role: Comparator converts analog hall-effect or capacitance change into clean digital enable/disable signal. Use Value: Eliminates false triggers from EMI or vibration due to 3.5 nA input bias and 2 kV HBM immunity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM239DR | SOIC-14 package (8.70 mm × 3.90 mm); identical electrical specs but lower thermal resistance (111.2°C/W vs. 114.9°C/W) | Better suited for high-density PCBs with limited board area and forced-air cooling | Select LM239DR when surface-mount assembly and improved thermal performance are required. |
| LM339N | Same PDIP-14 package; wider temp range (0°C to 70°C vs. −25°C to +85°C) and higher offset (±9 mV vs. ±9 mV - identical max, but LM239NG4 has tighter typical spec) | Targeted at commercial-grade equipment where extended industrial temperature is not mandatory | Choose LM339N only for cost-sensitive consumer applications with ambient-limited environments. |
Compared with LM239DR and LM339N, LM239NG4 offers guaranteed −25°C to +85°C operation in through-hole PDIP, making it optimal for field-serviceable industrial hardware requiring mechanical robustness and legacy compatibility.
Availability
LM239NG4 is available at Aetrix Electronics and suitable for server PSU monitoring, industrial motor drive feedback, and factory automation safety interlocks requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM239NG4 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 power management ICs.
The LM239NG4 belongs to TI's industry-standard quad comparator family, engineered for industrial-grade reliability, wide supply range operation, and seamless drop-in replacement across legacy and next-generation designs.
FAQ
What is the maximum supply voltage rating for LM239NG4?
The LM239NG4 supports an absolute maximum supply voltage of 36 V, with recommended operation from 2 V to 36 V. This rating is confirmed in Section 6.2 of the official TI datasheet (SLCS006Z), and applies to continuous DC operation under specified thermal conditions. Exceeding 36 V risks permanent device damage.
Does LM239NG4 support rail-to-rail input operation?
Yes, LM239NG4 supports rail-to-rail common-mode input voltage from ground (V−) to VCC − 2 V. This allows direct interface with low-side current shunts and battery terminals without level-shifting. The feature is explicitly documented in Sections 6.4 and 6.7 of the TI datasheet for LM239NG4 and its LM239A-grade equivalents.
What is the typical input offset voltage of LM239NG4?
The LM239NG4 has a typical input offset voltage of ±0.37 mV at 25°C and 5 V supply, with a maximum of ±9 mV across its full operating temperature range (−25°C to +85°C). This value is specified in Table 6-10 of the TI datasheet and distinguishes it from earlier LM339 variants with looser offset tolerances.
Can LM239NG4 replace LM339N in existing designs?
Yes, LM239NG4 is a direct functional and pin-compatible replacement for LM339N in PDIP-14 packages. Both share identical pinout, supply range (2–36 V), and open-collector output structure. However, LM239NG4 guarantees −25°C to +85°C operation versus LM339N's 0°C to 70°C range, offering broader environmental resilience.
What package type is used for LM239NG4?
LM239NG4 uses a 14-pin plastic dual in-line package (PDIP) with 19.30 mm × 6.40 mm body dimensions and 0.300-inch lead spacing. This through-hole package is explicitly listed in TI's orderable addendum for LM239x devices and matches the mechanical footprint of legacy LM239, LM339, and LM2901 variants in DIP format.
LM239NG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector
- Voltage - Supply, Single/Dual (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -25°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 14-PDIP
LM239NG4 FAQ
1.How can I place an order for LM239NG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for LM239NG4 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 LM239NG4 reliable?
The price and inventory of LM239NG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM239NG4 is usually 5 days.
3.What payment methods are accepted for LM239NG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM239NG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM239NG4?
LM239NG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM239NG4 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 LM239NG4?
For technical support, including LM239NG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM239NG4 requirements.
6.How does Aetrix verify that LM239NG4 is sourced from the original manufacturer or authorized distributors?
All LM239NG4 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 LM239NG4 meets industry standards.
7.What is the process for return or replacement of LM239NG4?
All LM239NG4 units undergo pre-shipment inspection (PSI). If there is an issue with LM239NG4, 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 LM239NG4 part is unused and in its original packaging.
Return procedure for LM239NG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM239NG4 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
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