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Texas Instruments LM239ADR
- Part No.:
- LM239ADR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM239ADR.pdf
- Description:
- IC COMPARATOR 4 DIFF 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:18,061
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Product details
Overview
LM239ADR 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 LM239ADR datasheet, LM239ADR pinout, LM239ADR application, or LM239ADR equivalent, this page delivers verified electrical specifications, SOIC-14 package details, functional pin mapping, real-world use cases in server PSUs and factory automation, and two validated alternative parts with documented technical and application differences.
Technical Context
The LM239ADR belongs to the legacy LM239 family and operates as an open-collector output comparator with rail-to-rail common-mode input range down to ground. Its internal architecture supports independent comparison of four analog input pairs without cross-talk, enabling simultaneous multi-threshold detection in power sequencing and overvoltage protection systems.
It uses bipolar process technology optimized for wide supply voltage tolerance and robust input stage ESD protection (2 kV HBM), with quiescent current independent of supply voltage-ensuring stable 0.8–2 mA total ICC across 5 V to 36 V operation at 25 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - Enables direct integration into 3.3 V, 5 V, 12 V, and 24 V industrial rails without level-shifting. |
| Input Offset Voltage (max) | ±9 mV over temperature - Defines worst-case threshold error in precision window-comparator designs. |
| Input Bias Current (typ) | 25 nA - Minimizes loading on high-impedance sensor sources like thermistors or photodiodes. |
| Propagation Delay | 1.3 µs (100 mV step) - Supports response to fast transients in UPS battery switchover and motor stall detection. |
| Output Sink Current | 16 mA - Drives standard LED indicators or TTL/CMOS logic inputs directly without external buffers. |
| Common-Mode Input Range | 0 V to (VCC – 2 V) - Allows direct sensing of signals referenced to ground in single-supply systems. |
| ESD Rating (HBM) | 2000 V - Meets IEC 61000-4-2 Level 2 for handling robustness in manufacturing and field service. |
Pinout & Package
LM239ADR is supplied 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 compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OUT1) | Comparator 1 output | Open-collector NPN output requiring external pull-up; sinks current when IN1– > IN1+. |
| 2 (IN1–) | Comparator 1 inverting input | Accepts reference or feedback signal; common-mode range includes ground. |
| 3 (IN1+) | Comparator 1 non-inverting input | Accepts sensed voltage; supports up to VCC-level input without damage. |
| 4 (OUT2) | Comparator 2 output | Independent open-collector output; electrically isolated from OUT1. |
| 5 (IN2–) | Comparator 2 inverting input | Used for second threshold comparison; shares same VCC/GND supply domain. |
| 6 (IN2+) | Comparator 2 non-inverting input | Enables dual-window or hysteresis configuration with external resistor network. |
| 7 (VCC) | Positive supply | Single supply input; powers all four comparators and internal bias circuitry. |
| 8 (GND) | Ground reference | Return path for supply and outputs; must be low-impedance for noise immunity. |
| 9 (IN3+) | Comparator 3 non-inverting input | Third channel input; supports cascaded or parallel multi-condition logic. |
| 10 (IN3–) | Comparator 3 inverting input | Paired with IN3+ for third independent comparison function. |
| 11 (OUT3) | Comparator 3 output | Third open-collector output; usable for status flag generation or OR-wired logic. |
| 12 (IN4+) | Comparator 4 non-inverting input | Fourth channel input; enables full quad-threshold monitoring in compact space. |
| 13 (IN4–) | Comparator 4 inverting input | Completes fourth independent comparator pair for fault redundancy or voting logic. |
| 14 (OUT4) | Comparator 4 output | Final output; supports wired-AND configurations with other comparators' outputs. |
Key Features
| Feature | Design Value |
|---|---|
| Quad independent comparators | Four fully isolated channels in one SOIC-14 package reduce board area vs. discrete solutions. |
| Single-supply operation | Operates from 2 V to 36 V with ground-referenced inputs-eliminates need for split supplies in embedded systems. |
| Open-collector outputs | Enable flexible interfacing with TTL, CMOS, or MOS logic via user-selected pull-up voltage and value. |
| Differential input voltage range | ±38 V rating allows direct comparison of signals exceeding supply rails-critical for overvoltage detection. |
| Low input bias current | 25 nA typical minimizes error in high-impedance divider networks used in battery voltage monitoring. |
Applications
| Server Power Supply Monitoring | Factory Automation Safety Interlock |
|---|---|
Use Scenario: Real-time validation of +12 V, +5 V, +3.3 V, and standby rails in redundant server PSUs. IC Role / Device Role / Timing Role: Quad comparator monitors each rail against precision references; outputs drive fault latches or microcontroller GPIOs. Use Value: Detects undervoltage/overvoltage within 1.3 µs, preventing system crashes during brownout events. | Use Scenario: Verifying emergency stop button state, light curtain integrity, and door switch closure before machine startup. IC Role / Device Role / Timing Role: LM239ADR compares mechanical switch voltages against thresholds to generate fail-safe enable/disable logic. Use Value: Ground-referenced inputs simplify wiring; open-collector outputs interface directly with PLC input modules. |
| Motor Drive Overcurrent Protection | Appliance Temperature Threshold Control |
Use Scenario: Monitoring shunt resistor voltage drops across three-phase inverter legs in cordless power tools. IC Role / Device Role / Timing Role: Each comparator channel detects current-limit violations; outputs trigger gate driver shutdown. Use Value: ±38 V differential input range accommodates high-side sensing without level shifters. | Use Scenario: Controlling heating element duty cycle in smart ovens based on thermistor voltage thresholds. IC Role / Device Role / Timing Role: LM239ADR implements hysteresis-based on/off control using dual comparators per zone. Use Value: Low 25 nA input bias avoids self-heating errors in high-resistance thermistor networks. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM239DR | Same SOIC-14 package and pinout; identical electrical specs but rated for –25°C to +85°C industrial temp range (LM239ADR is –25°C to +85°C). | No functional difference; LM239DR is generic industrial-grade variant without "A" suffix designation. | Select LM239DR when full LM239 family compatibility is required and A-grade traceability is not mandated. |
| LM339ADR | Same pinout and function; wider operating temperature range (0°C to +70°C) and higher max supply (30 V vs. 36 V); offset voltage spec looser (±9 mV vs. ±9 mV, same). | Preferred in commercial-grade applications where extended temp is unnecessary and cost sensitivity is higher. | Choose LM339ADR for cost-optimized consumer electronics where ambient conditions stay within 0°C–70°C. |
Compared with LM239DR and LM339ADR, LM239ADR provides guaranteed –25°C to +85°C operation with full 36 V supply support and consistent 25 nA input bias-making it optimal for industrial motor drives and server PSUs demanding thermal margin and rail flexibility.
Availability
LM239ADR is available at Aetrix Electronics and suitable for server PSU design, factory automation safety interlocks, and cordless power tool motor control requiring stable component supply across extended temperature and voltage ranges.
Supply support for LM239ADR 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 communications markets.
The LM239ADR belongs to TI's legacy precision comparator product line, engineered for reliability in industrial power management, motor control, and safety-critical monitoring applications where wide supply range and ground-sensing capability are essential.
FAQ
What is the maximum supply voltage rating for LM239ADR?
The LM239ADR supports a maximum supply voltage of 36 V, as specified in its absolute maximum ratings. This allows direct operation from 24 V industrial rails and 36 V battery systems without external regulation. Exceeding 36 V risks permanent device damage, and operation above 30 V requires verification of thermal dissipation under load conditions per the datasheet's RθJA value of 111.2 °C/W.
Does LM239ADR support rail-to-rail input operation?
LM239ADR supports common-mode input voltage down to ground (0 V), but its upper limit is VCC – 2 V under normal operation. However, either input may safely exceed VCC up to +38 V relative to the other input due to its ±38 V differential input voltage rating. This enables high-side sensing without level shifters, though only one input needs to remain within the valid common-mode range for correct output behavior.
Can LM239ADR outputs be wire-OR'd together?
Yes, LM239ADR features open-collector outputs that can be externally pulled up to a common voltage and wired together to implement logical AND or NAND functions. When any comparator output pulls low, the shared node goes low-enabling fault aggregation across multiple monitored rails or sensors. Ensure total sink current remains below 20 mA per output and verify pull-up resistor value for rise time and logic threshold compliance.
What is the typical input offset voltage of LM239ADR?
The LM239ADR has a typical input offset voltage of ±9 mV over temperature (–25°C to +85°C), with a maximum of ±9 mV. This value defines the smallest detectable voltage difference between inputs and directly impacts accuracy in precision threshold detection. For applications requiring tighter matching, consider the B-version (LM339B) with ±5.5 mV max offset, though it uses different packaging and temperature grading.
Is LM239ADR pin-compatible with LM339ADR?
Yes, LM239ADR is pin-compatible with LM339ADR in the SOIC-14 package: both share identical pin numbering, function mapping, and open-collector output structure. However, LM339ADR is rated for 0°C to +70°C operation and 30 V max supply, while LM239ADR supports –25°C to +85°C and 36 V-making LM239ADR suitable for broader industrial environments where thermal and voltage margins are critical.
LM239ADR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 4
- Output Type:
- Open-Collector
- Voltage - Supply, Single/Dual (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 3mV @ 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
LM239ADR FAQ
1.How can I place an order for LM239ADR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM239ADR 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 LM239ADR reliable?
The price and inventory of LM239ADR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM239ADR is usually 5 days.
3.What payment methods are accepted for LM239ADR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM239ADR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM239ADR?
LM239ADR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM239ADR 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 LM239ADR?
For technical support, including LM239ADR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM239ADR requirements.
6.How does Aetrix verify that LM239ADR is sourced from the original manufacturer or authorized distributors?
All LM239ADR 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 LM239ADR meets industry standards.
7.What is the process for return or replacement of LM239ADR?
All LM239ADR units undergo pre-shipment inspection (PSI). If there is an issue with LM239ADR, 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 LM239ADR part is unused and in its original packaging.
Return procedure for LM239ADR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM239ADR Tags
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LM2903DR
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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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NCX2200GMAZ
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