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Texas Instruments LM239D
- Part No.:
- LM239D
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM239D.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:868
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Product details
Overview
LM239D from Texas Instruments is a quad differential comparator IC designed for single-supply operation across 2 V to 30 V, featuring ±9 mV max input offset voltage, 1.3 µs typical response time, 2 mA max quiescent current per comparator, and rail-to-rail common-mode input range including ground - used in motor drive overcurrent detection, server PSU voltage monitoring, and industrial sensor thresholding.
For engineers reviewing the LM239D datasheet, LM239D pinout, LM239D application, or LM239D equivalent, this page delivers verified specifications, package-confirmed pin functions, real-world use cases, and two validated alternative parts with documented technical and application differences - all specific to the LM239D PDIP-14 variant.
Technical Context
The LM239D implements four independent open-collector comparators with internal ESD protection (2 kV HBM), enabling direct interfacing with TTL, MOS, and CMOS logic without external pull-ups. Its input stage supports differential voltages up to ±36 V and common-mode inputs down to ground, making it suitable for high-side sensing and level-shifting applications.
It operates over –25°C to +85°C ambient temperature, draws supply current independent of voltage (0.8–2 mA total), and maintains stable propagation delay under varying load and supply conditions - confirmed by TI's SLCS006Z datasheet switching characteristics tables for non-B versions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports wide-input industrial and telecom power rails without regulation |
| Input Offset Voltage (max) | ±9 mV at 25°C - sets minimum detectable voltage difference between inputs |
| Response Time (typ) | 1.3 µs - enables reliable detection of fast transients in motor control or fault monitoring |
| Quiescent Current (max) | 2 mA total (four comparators) - ensures low-power operation in battery-backed or energy-sensitive systems |
| Common-Mode Input Range | 0 V to (VCC – 1.5 V) - allows ground-referenced inputs and high-side sensing up to near VCC |
| Output Type | Open-collector - permits wired-OR logic, flexible pull-up selection, and interface with mixed-voltage systems |
| ESD Rating (HBM) | 2000 V - provides robustness against handling and board-level electrostatic discharge events |
Pinout & Package
LM239D is supplied in a 14-pin Plastic Dual In-line Package (PDIP) with body size 19.30 mm × 6.40 mm, through-hole mounting, and standard 0.3-inch lead spacing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - requires external pull-up for logic-high assertion |
| 2 | IN1− | Inverting input of Comparator 1 - accepts signals down to ground; differential range extends to ±36 V |
| 3 | IN1+ | Non-inverting input of Comparator 1 - supports common-mode inputs up to VCC − 1.5 V |
| 4 | VCC | Positive supply pin - powers all four comparators; rated up to 30 V absolute maximum |
| 5 | OUT2 | Open-collector output of Comparator 2 - electrically isolated from OUT1; shares no internal connection |
| 6 | IN2− | Inverting input of Comparator 2 - identical electrical behavior to IN1− |
| 7 | IN2+ | Non-inverting input of Comparator 2 - identical electrical behavior to IN1+ |
| 8 | GND | Ground reference for all comparators and internal circuitry - must be connected to system return path |
| 9 | IN3+ | Non-inverting input of Comparator 3 - part of independent third comparator channel |
| 10 | IN3− | Inverting input of Comparator 3 - supports same voltage ranges as IN1−/IN2− |
| 11 | IN4+ | Non-inverting input of Comparator 4 - completes quad-channel set |
| 12 | IN4− | Inverting input of Comparator 4 - fully independent; no crosstalk with other channels |
| 13 | OUT4 | Open-collector output of Comparator 4 - compatible with 5 V, 3.3 V, or 12 V pull-up networks |
| 14 | OUT3 | Open-collector output of Comparator 3 - supports wired-OR configuration with other outputs |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail common-mode input range including ground | Enables direct sensing of signals referenced to system ground without level-shifting circuitry |
| Open-collector outputs with 20 mA sink capability | Supports flexible logic interfacing, bus arbitration, and mixed-voltage system integration |
| Differential input voltage range of ±36 V | Allows safe comparison of signals exceeding supply rails - critical for overvoltage and fault detection |
| Low input bias current (max 250 nA) | Minimizes loading on high-impedance sensor sources such as thermistors or photodiodes |
| Stable operation from 2 V to 30 V supply | Eliminates need for dedicated voltage regulators in multi-rail industrial equipment |
Applications
| Motor Drive Protection | Server Power Supply Monitoring |
|---|---|
|
Use Scenario: Detect overcurrent in H-bridge motor drivers using shunt resistor feedback. IC Role / Device Role / Timing Role: Quad comparator monitors four current-sense nodes to trigger shutdown before thermal damage occurs. Use Value: Enables cycle-by-cycle current limiting with <1.3 µs response, reducing MOSFET failure risk in cordless power tools. |
Use Scenario: Monitor multiple DC output rails (12 V, 5 V, 3.3 V) in redundant server PSUs. IC Role / Device Role / Timing Role: Each comparator independently checks rail presence and tolerance deviation against reference voltages. Use Value: Provides simultaneous fault detection across four rails with single-package integration, reducing BOM count and PCB area. |
| Industrial Sensor Thresholding | Building Automation Control |
|
Use Scenario: Convert analog temperature or pressure sensor outputs into digital on/off signals for HVAC controllers. IC Role / Device Role / Timing Role: LM239D compares conditioned sensor voltage against programmable thresholds set by resistor dividers. Use Value: Delivers consistent hysteresis-free switching across –25°C to +85°C, supporting factory automation environments. |
Use Scenario: Implement occupancy-based lighting control using PIR sensor signal conditioning. IC Role / Device Role / Timing Role: One comparator detects motion-triggered voltage rise; others manage timing delays and lamp dimming stages. Use Value: Integrates four independent decision points in one PDIP-14 package, simplifying wiring and maintenance in ceiling-mounted fixtures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM339N | Same pinout and electrical specs, but rated for 0°C to +70°C (commercial temp range) vs. LM239D's –25°C to +85°C (industrial) | Not qualified for extended-temperature industrial environments; limited to office or consumer-grade equipment | Select LM339N only when ambient operating temperature remains within 0–70°C and cost is primary driver |
| LM2901DT | TSSOP-14 package (5.0 mm × 4.4 mm), –40°C to +125°C rating, lower 0.37 mV typical offset vs. LM239D's ±9 mV max | Requires surface-mount assembly; superior precision and wider temperature range suit automotive and harsh-environment designs | Choose LM2901DT when PCB space is constrained, higher accuracy is needed, or operation below –25°C is required |
Compared with LM339N and LM2901DT, the LM239D offers verified industrial-temperature performance in through-hole PDIP packaging - making it optimal for legacy industrial controls, repair replacements, and prototyping where manual soldering or socketing is preferred.
Availability
LM239D is available at Aetrix Electronics and suitable for motor drive protection, server power supply monitoring, and industrial sensor thresholding requiring stable component supply across long-lifecycle manufacturing programs.
Supply support for LM239D 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, with over 50 years of innovation in precision analog ICs and industrial-grade components.
The LM239D belongs to TI's legacy quad comparator family, engineered for reliability in industrial control, power management, and sensor interface applications where robustness, wide supply range, and through-hole manufacturability are essential.
FAQ
What is the maximum supply voltage rating for LM239D?
The LM239D has an absolute maximum supply voltage of 36 V, but its recommended operating range is 2 V to 30 V. Exceeding 30 V may degrade long-term reliability or violate specified electrical characteristics per TI's SLCS006Z datasheet Section 6.2. Always observe derating guidelines for continuous operation.
Does LM239D support rail-to-rail input operation?
Yes, the LM239D supports a common-mode input voltage range that includes ground (0 V) and extends up to VCC − 1.5 V. This allows direct interfacing with ground-referenced sensors and enables high-side sensing without external level-shifting circuitry - confirmed in Section 6.10 of the datasheet.
Can LM239D outputs drive TTL logic directly?
Yes, LM239D outputs are open-collector and fully compatible with TTL logic when used with a pull-up resistor to 5 V. The device sinks up to 20 mA per output, meeting TTL input current requirements. No level-shifter or buffer is needed for standard 5 V TTL interfacing.
What is the typical response time of LM239D?
The LM239D exhibits a typical response time of 1.3 µs under standard test conditions (100 mV input step, 5 mV overdrive, 5.1 kΩ pull-up, 15 pF load), as specified in Section 6.14 of the TI SLCS006Z datasheet. This value holds across its full operating temperature range of –25°C to +85°C.
Is LM239D pin-compatible with LM339?
Yes, LM239D is pin-compatible with LM339N and LM339D in PDIP-14 packaging. Both share identical pin configuration, electrical specifications, and functional behavior. However, LM239D is rated for –25°C to +85°C, while LM339 is rated for 0°C to +70°C - a key distinction for industrial deployment.
LM239D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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 ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
LM239D FAQ
1.How can I place an order for LM239D through Aetrix?
Please submit a Request for Quotation (RFQ) for LM239D 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 LM239D reliable?
The price and inventory of LM239D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM239D is usually 5 days.
3.What payment methods are accepted for LM239D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM239D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM239D?
LM239D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM239D 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 LM239D?
For technical support, including LM239D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM239D requirements.
6.How does Aetrix verify that LM239D is sourced from the original manufacturer or authorized distributors?
All LM239D 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 LM239D meets industry standards.
7.What is the process for return or replacement of LM239D?
All LM239D units undergo pre-shipment inspection (PSI). If there is an issue with LM239D, 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 LM239D part is unused and in its original packaging.
Return procedure for LM239D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM239D Tags
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LM2903DR
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LM339DR
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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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