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Texas Instruments LM393 MDC
- Part No.:
- LM393 MDC
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- Die
- Datasheet:
-
LM393 MDC.pdf
- Description:
- IC COMPARATOR 2 DIFF DIE
- Quantity:
- Payment:
- Shipping:
Inventory:3,520
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Product details
Overview
LM393 MDC from Texas Instruments is a dual differential voltage comparator IC designed for single- or dual-supply operation across 2 V to 30 V, featuring 0.4 mA typical supply current per comparator, 2 mV typical input offset voltage, and open-collector outputs compatible with TTL/MOS/CMOS logic-commonly used in motor control feedback loops and chemical sensor threshold detection.
For engineers reviewing the LM393 MDC datasheet, LM393 MDC pinout, LM393 MDC application, or LM393 MDC equivalent, key selection considerations include its rail-to-rail common-mode input range (0 V to VCC–2 V), ±36 V differential input capability, low 25 nA typical input bias current, and suitability for level-shifting and hysteresis-free analog comparators in industrial embedded systems.
Technical Context
The LM393 MDC integrates two independent comparators with PNP Darlington-pair inputs enabling high gain and sub-25 nA input bias current while supporting common-mode voltages down to ground and up to VCC–2 V over –40°C to +85°C. Its open-drain NPN output stage sinks current when IN+ exceeds IN– by more than the offset voltage, requiring an external pull-up resistor to define logic-high voltage.
It operates with supply voltages from 2 V to 30 V (absolute max 36 V), exhibits 1.3 µs typical response time at 100-mV overdrive with 15 pF load, and maintains stable performance without internal hysteresis-making it appropriate for precision zero-crossing detection and reference-comparison circuits where external hysteresis must be added deliberately.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V (tested); enables direct interface with 3.3 V, 5 V, 12 V, and 24 V industrial rails without level translation. |
| Input Offset Voltage | 2 mV typical (25°C); determines minimum detectable voltage difference between IN+ and IN– before output switching. |
| Input Bias Current | 25 nA typical (25°C); permits high-impedance sensor interfaces (e.g., thermistors, photodiodes) without significant loading error. |
| Common-Mode Input Range | 0 V to VCC–2 V (–40°C to +85°C); supports ground-referenced inputs and simplifies single-supply design with no negative rail required. |
| Differential Input Voltage | ±36 V maximum; allows safe comparison of signals referenced to different potentials (e.g., isolated power supply monitoring). |
| Output Type | Open-collector NPN; enables wired-AND logic, flexible pull-up voltage selection (e.g., 3.3 V MCU I/O), and level shifting across domains. |
| Response Time | 1.3 µs typical (100-mV overdrive, 15 pF load); suitable for medium-speed event detection such as overvoltage latch or PWM edge sensing. |
| Quiescent Current | 0.4 mA per comparator (typical); supports low-power battery-operated sensor nodes with dual-comparator functionality. |
Pinout & Package
LM393 MDC is supplied in a die-sale (unpackaged wafer-die) format per TI's orderable addendum, intended for custom hybrid or module-level integration-not surface-mount or through-hole PCB assembly. No standardized package footprint or thermal pad layout applies.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Output (Comparator 1) | Open-collector NPN drain; sinks current when IN+ > IN– + VIO; requires external pull-up for logic-high assertion. |
| 1IN− | Inverting Input (Comparator 1) | Negative input node for first comparator; accepts voltages from 0 V to VCC–2 V; high-impedance Darlington input. |
| 1IN+ | Non-inverting Input (Comparator 1) | Positive input node for first comparator; same voltage range and impedance as 1IN−; defines comparison threshold. |
| GND | Ground Reference | Power and signal reference plane; common return for both comparators and supply decoupling. |
| 2IN+ | Non-inverting Input (Comparator 2) | Independent positive input for second comparator; electrically isolated from first comparator's inputs. |
| 2IN− | Inverting Input (Comparator 2) | Independent negative input for second comparator; supports separate signal/reference pair from Comparator 1. |
| 2OUT | Output (Comparator 2) | Second open-collector output; functionally identical to 1OUT; enables dual-threshold or window-comparator topologies. |
| VCC | Positive Supply | Single positive supply pin (2–30 V); powers both comparators; no separate VEE required for standard operation. |
Key Features
| Feature | Design Value |
|---|---|
| Single- or dual-supply operation | Operates from 2 V to 30 V single supply or split supplies (e.g., ±15 V), eliminating need for dedicated negative rails in most applications. |
| Ground-sensing input stage | Common-mode range includes 0 V, enabling direct comparison of signals referenced to system ground without level-shifting circuitry. |
| Low input bias current | 25 nA typical ensures minimal loading on high-impedance sources like RTDs, pH electrodes, or capacitive sensors. |
| Wide differential input tolerance | ±36 V rating protects against transient overvoltage events during hot-swap, inductive kickback, or isolation barrier faults. |
| Open-collector output compatibility | Direct interface with TTL, MOS, and CMOS logic families via configurable pull-up voltage-supports mixed-voltage system interconnect. |
| Temperature-rated performance | Specified from –40°C to +85°C, matching industrial ambient requirements without derating or external compensation. |
Applications
| Chemical/Gas Sensor Interface | Motor Control Feedback |
|---|---|
|
Use Scenario: Detecting threshold crossings in analog output from electrochemical gas sensors or resistive humidity elements. IC Role / Device Role / Timing Role: Dual comparator monitors sensor output against upper/lower reference voltages to trigger alarm or enable ventilation control. Use Value: 2 mV offset and 25 nA bias current preserve measurement accuracy across temperature; open-collector outputs drive optocouplers or relay drivers directly. |
Use Scenario: Monitoring back-EMF zero-crossing or overcurrent sense voltage in AC induction motor drives. IC Role / Device Role / Timing Role: Comparator 1 detects rotor position timing; Comparator 2 validates current-limit thresholds for IGBT gate protection. Use Value: 1.3 µs response enables accurate commutation timing at 20 kHz PWM frequencies; ±36 V differential input withstands motor winding transients. |
| Weigh Scale Load Cell Amplifier Stage | Desktop PC Power Sequencing |
|
Use Scenario: Converting amplified millivolt-level bridge output into digital logic for microcontroller ADC triggering or overload cutoff. IC Role / Device Role / Timing Role: Compares conditioned load cell signal to calibrated reference to generate go/no-go pass/fail flag. Use Value: Rail-to-rail common-mode range accommodates instrumentation amplifier output swing; low 0.4 mA supply current minimizes self-heating drift. |
Use Scenario: Validating +3.3 V, +5 V, and +12 V rail stability before releasing reset to CPU and chipset during PC boot sequence. IC Role / Device Role / Timing Role: Each comparator independently verifies one supply rail against precision reference; outputs feed AND gate for global power-good signal. Use Value: Independent dual channels eliminate need for multiple single-comparator ICs; 30 V max supply supports direct connection to unregulated 12 V standby rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual differential comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | SOIC-8 packaged version with identical electrical specs; includes full JEDEC-standard footprint and reflow compatibility. | Designed for automated SMT assembly; not suitable for die-bonding or custom substrate integration. | Select LM393DR for standard PCB production; LM393 MDC only where bare-die mounting or hybrid packaging is required. |
| TL393IP | Same functional spec but rated for –40°C to +105°C; higher 1.2 mA max supply current; PDIP-8 package. | Better suited for extended-temperature automotive or outdoor equipment where ambient exceeds +85°C. | Choose TL393IP when operating above +85°C is required; LM393 MDC remains optimal for cost-sensitive industrial designs within –40°C to +85°C. |
Compared with LM393DR and TL393IP, the LM393 MDC offers identical core comparator performance in die form-enabling space-constrained or thermally optimized module designs-but lacks standardized packaging, requiring custom handling and bonding processes not needed for SOIC or PDIP alternatives.
Availability
LM393 MDC is available at Aetrix Electronics and suitable for motor control feedback, chemical sensor thresholding, weigh scale load-cell interfacing, and desktop PC power sequencing requiring stable component supply across industrial temperature ranges.
Supply support for LM393 MDC 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 U.S.-based semiconductor company founded in 1930, specializing in analog ICs, embedded processors, and high-reliability components for industrial, automotive, and aerospace markets.
The LM393 MDC belongs to TI's legacy analog comparator product line, engineered for robustness, wide supply flexibility, and ease of use in cost-sensitive industrial control and sensor interface applications.
FAQ
What is the operating temperature range for the LM393 MDC?
The LM393 MDC is specified for operation from –40°C to +85°C, matching industrial-grade environmental requirements. This range is confirmed in TI's orderable addendum and supported by electrical characteristics testing across that span-including input offset voltage, supply current, and response time. The LM393 MDC does not extend to military or automotive AEC-Q100 temperature grades.
Does the LM393 MDC require a negative supply voltage?
No, the LM393 MDC operates fully from a single positive supply (2 V to 30 V) with ground as the reference. Its input common-mode range includes 0 V, and its open-collector outputs function correctly with only VCC and GND connections. A negative supply is optional and only needed if dual-supply configuration is desired for specific signal-referencing needs.
How does the open-collector output of the LM393 MDC work in practice?
The LM393 MDC's outputs are open-collector NPN transistors that sink current when active (IN+ > IN– + VIO). To produce a logic-high state, an external pull-up resistor must connect the output pin to a chosen voltage rail (e.g., 3.3 V for MCU I/O). This architecture enables wired-AND logic, level shifting, and compatibility with mixed-voltage systems-core functionality confirmed in the LM393 MDC datasheet's functional description.
Can the LM393 MDC be used in a window comparator configuration?
Yes, the LM393 MDC's two independent comparators allow implementation of a window comparator: one comparator monitors the upper threshold (IN+ tied to signal, IN– to high reference), the other the lower threshold (IN+ tied to low reference, IN– to signal), with outputs combined via external logic. This topology is explicitly supported by the LM393 MDC's pinout, electrical isolation between channels, and absence of internal hysteresis.
What is the maximum differential input voltage the LM393 MDC can tolerate?
The LM393 MDC supports a maximum differential input voltage of ±36 V, meaning the voltage at IN+ may exceed IN– by up to 36 V-or vice versa-without damage. This rating is specified in the Absolute Maximum Ratings table and verified per JEDEC stress-test standards, making the LM393 MDC suitable for interfacing with high-voltage transducers or fault-tolerant industrial signal chains.
LM393 MDC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- Die
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 30V, ±1V ~ 15V
- :
- 5mV @ 1.4V
- Voltage - Input Offset (Max):
- 0.25µA @ 1.4V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 1mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- Die
LM393 MDC FAQ
1.How can I place an order for LM393 MDC through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393 MDC 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 LM393 MDC reliable?
The price and inventory of LM393 MDC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393 MDC is usually 5 days.
3.What payment methods are accepted for LM393 MDC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393 MDC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393 MDC?
LM393 MDC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393 MDC 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 LM393 MDC?
For technical support, including LM393 MDC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393 MDC requirements.
6.How does Aetrix verify that LM393 MDC is sourced from the original manufacturer or authorized distributors?
All LM393 MDC 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 LM393 MDC meets industry standards.
7.What is the process for return or replacement of LM393 MDC?
All LM393 MDC units undergo pre-shipment inspection (PSI). If there is an issue with LM393 MDC, 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 LM393 MDC part is unused and in its original packaging.
Return procedure for LM393 MDC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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