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Texas Instruments LM293DR
- Part No.:
- LM293DR
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM293DR.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,925
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Product details
Overview
LM293DR from Texas Instruments is a dual voltage comparator designed for single-supply operation across 2 V to 30 V, featuring ±9 mV max input offset voltage, 1.3 µs typical response time, and rail-to-rail input capability down to ground-enabling precise threshold detection in power supply monitoring, motor control feedback, and industrial sensor interfaces.
For engineers reviewing the LM293DR datasheet, LM293DR pinout, LM293DR application, or LM293DR equivalent, key selection criteria include its guaranteed operation over –25°C to +85°C, open-collector outputs compatible with TTL/MOS/CMOS logic, low quiescent current (≤1 mA), and SOIC-8 package compatibility with legacy board layouts.
Technical Context
The LM293DR implements two independent, high-gain comparators with internal hysteresis-free architecture optimized for fast decision-making in analog-to-digital signal conditioning. Its input stage supports common-mode voltages from ground to VCC – 2 V, and differential inputs tolerate up to ±36 V without damage.
Output stages are open-collector NPN transistors capable of sinking ≥6 mA at 1.5 V saturation, enabling flexible pull-up configurations and direct interfacing with microcontroller GPIOs, LEDs, or relay drivers without level-shifting circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports wide-input industrial and automotive auxiliary rails without external regulation |
| Input Offset Voltage (max) | ±9 mV over temperature - ensures reliable switching within 18 mV total window for precision thresholding |
| Response Time (typ) | 1.3 µs - enables real-time overvoltage/undervoltage detection in switched-mode power supplies |
| Input Bias Current (max) | –400 nA - minimizes loading error on high-impedance sensor bridges or RC timing networks |
| Output Sink Current (min) | 6 mA at VOL = 1.5 V - drives standard LEDs or logic-level MOSFET gates directly |
| Operating Temperature | –25°C to +85°C - qualified for commercial and extended-temperature industrial environments |
| ESD Rating (HBM) | 2000 V - meets IEC 61000-4-2 Level 2 for robustness in assembly and field handling |
Pinout & Package
LM293DR is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package with 4.90 mm × 3.91 mm body size and standard 1.27 mm pitch. The package is RoHS-compliant, lead-free, and rated for surface-mount reflow soldering per JEDEC J-STD-020.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector NPN - requires external pull-up; sinks current when IN+ < IN− |
| 1IN− | Comparator 1 inverting input | Differential input node - referenced to threshold or feedback signal |
| 1IN+ | Comparator 1 non-inverting input | Differential input node - connected to sensed voltage or reference |
| GND | Ground reference | Common return path for supply and inputs; must be low-impedance |
| 2IN+ | Comparator 2 non-inverting input | Independent sensing node - enables dual-threshold or window-comparator topologies |
| 2IN− | Comparator 2 inverting input | Independent sensing node - configurable as reference or inverted feedback |
| 2OUT | Comparator 2 output | Open-collector NPN - electrically isolated from 1OUT; supports separate load control |
| VCC | Positive supply | Single power rail - powers both comparators; no negative supply required |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC – 2 V - eliminates need for input biasing resistors in single-supply systems |
| Open-collector outputs | Enable wired-OR logic, level translation, and direct drive of loads up to 30 V - simplifies interface design |
| Low input bias current | Max –400 nA - preserves accuracy in high-Z applications like thermistor or photodiode sensing |
| Wide supply voltage range | 2 V to 30 V - interoperable with 3.3 V, 5 V, 12 V, and 24 V systems without redesign |
| Fast propagation delay | 1.3 µs typical - supports dynamic monitoring in motor commutation and UPS transfer switching |
Applications
| Power Supply Monitoring | Motor Control Feedback |
|---|---|
|
Use Scenario: Detecting overvoltage and undervoltage conditions in server PSUs and telecom rectifiers. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel monitors upper limit, the other lower limit. Use Value: Ensures system shutdown before rail excursion damages downstream FPGAs or memory, leveraging guaranteed 1.3 µs response. |
Use Scenario: Sensing back-EMF zero-crossing in brushless DC motor commutation. IC Role / Device Role / Timing Role: Comparator compares phase voltage to mid-rail reference to generate timing edges for gate driver sequencing. Use Value: Enables precise electronic commutation without dedicated Hall sensors, reducing BOM cost and board space. |
| Industrial Sensor Interface | Appliance Safety Interlock |
|
Use Scenario: Converting analog output from pressure or temperature transducers into digital logic signals. IC Role / Device Role / Timing Role: Single comparator acting as threshold detector - converts linear sensor output to ON/OFF status. Use Value: Maintains accuracy despite sensor source impedance up to 100 kΩ due to ≤400 nA input bias current. |
Use Scenario: Verifying door latch closure and thermal cutoff in washing machines and ovens. IC Role / Device Role / Timing Role: Dual comparator validates two independent safety conditions before enabling heating elements. Use Value: Provides hardware-level redundancy - failure of one comparator does not compromise overall safety function. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Same pinout and electrical specs, but rated for 0°C to +70°C only - lacks extended temperature qualification. | Suitable for consumer-grade products; not recommended for industrial enclosures with ambient >70°C. | Select LM393DR only if operating temperature stays within 0°C–70°C and cost is primary constraint. |
| LM2903DR | Identical SOIC-8 footprint and pinout; wider temp range (–40°C to +125°C) and higher ESD rating (2 kV HBM). | Preferred for automotive under-hood or factory automation where thermal stress exceeds 85°C. | Choose LM2903DR when extended temperature or enhanced ruggedness is required - drop-in replacement with no layout change. |
Compared with LM293DR, LM393DR offers identical performance at lower cost but reduced temperature margin, while LM2903DR provides superior thermal and ESD robustness at minimal cost premium - making it the preferred upgrade path for new designs targeting harsh environments.
Availability
LM293DR is available at Aetrix Electronics and suitable for power supply monitoring, motor control feedback, and industrial sensor interface applications requiring stable component supply across long production lifecycles.
Supply support for LM293DR 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 LM293DR belongs to TI's industry-standard dual comparator family, engineered for reliability and interoperability in cost-sensitive, high-volume industrial control and power management systems.
FAQ
What is the maximum supply voltage for LM293DR?
The absolute maximum supply voltage for LM293DR is 36 V, but the recommended operating range is 2 V to 30 V per the datasheet. Operating above 30 V may degrade long-term reliability and is not guaranteed across temperature extremes. Always observe the 30 V upper limit in LM293DR designs to ensure consistent performance and lifetime compliance.
Does LM293DR support rail-to-rail input operation?
LM293DR supports input common-mode voltage from ground (0 V) up to VCC – 2 V, meaning it operates down to true ground but does not extend fully to the positive rail. This allows direct connection of sensors referenced to ground without level-shifting, but inputs exceeding VCC – 2 V risk incorrect output states. LM293DR's input stage is explicitly designed for single-supply ground-referenced systems.
Can LM293DR outputs drive LEDs directly?
Yes - each open-collector output of LM293DR can sink up to 6 mA at 1.5 V saturation, sufficient to drive standard indicator LEDs with appropriate series resistors. For example, with a 5 V pull-up and red LED (VF ≈ 1.8 V), a 470 Ω resistor limits current to ~6.8 mA, well within LM293DR's safe operating area. Ensure thermal derating if driving multiple LEDs continuously.
What is the input offset voltage specification for LM293DR?
LM293DR has a maximum input offset voltage of ±9 mV over its full operating temperature range (–25°C to +85°C). At room temperature (25°C), typical offset is ±2 mV. This specification defines the smallest differential input voltage required to switch the output reliably - critical for precision threshold detection in LM293DR-based voltage monitors and comparators.
Is LM293DR pin-compatible with LM393DR?
Yes - LM293DR and LM393DR share identical SOIC-8 pinout, electrical characteristics, and functional behavior. The only difference is temperature grading: LM293DR is rated for –25°C to +85°C, while LM393DR is specified for 0°C to +70°C. No PCB changes are needed when substituting LM293DR for LM393DR in existing designs, though thermal validation is advised for edge-case ambient conditions.
LM293DR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Open-Drain, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -25°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM293DR FAQ
1.How can I place an order for LM293DR through Aetrix?
Please submit a Request for Quotation (RFQ) for LM293DR 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 LM293DR reliable?
The price and inventory of LM293DR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM293DR is usually 5 days.
3.What payment methods are accepted for LM293DR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM293DR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM293DR?
LM293DR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM293DR 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 LM293DR?
For technical support, including LM293DR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM293DR requirements.
6.How does Aetrix verify that LM293DR is sourced from the original manufacturer or authorized distributors?
All LM293DR 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 LM293DR meets industry standards.
7.What is the process for return or replacement of LM293DR?
All LM293DR units undergo pre-shipment inspection (PSI). If there is an issue with LM293DR, 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 LM293DR part is unused and in its original packaging.
Return procedure for LM293DR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM293DR Tags
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