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Texas Instruments LM393MX
- Part No.:
- LM393MX
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM393MX.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,888
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Product details
Overview
LM393MX from Texas Instruments is a dual, low-power, precision voltage comparator IC with open-collector outputs, designed for single-supply operation from 2.0 V to 36 V or dual supplies (±1.0 V to ±18 V). It delivers ±3 mV max input offset voltage, 0.4 mA supply current at 5 V, and input common-mode range extending to ground - enabling accurate threshold detection in battery-powered sensor interfaces and industrial monitoring circuits.
For engineers reviewing the LM393MX datasheet, LM393MX pinout, LM393MX application, or LM393MX equivalent, key selection criteria include its rail-to-rail input capability down to GND, TTL/CMOS-compatible output sinking (up to 16 mA), low quiescent current for energy-constrained designs, and SOIC-8 packaging suitable for automated assembly and space-limited PCB layouts.
Technical Context
The LM393MX integrates two independent high-gain comparators with PNP input stages, enabling input bias currents as low as 25 nA and differential input voltage ranges equal to the full supply voltage (up to 36 V). Its open-collector NPN output stage allows flexible pull-up to any logic rail within the device's supply range and supports wired-OR configurations.
It operates across 0°C to +70°C ambient temperature, features input common-mode voltage range from 0 V to (V+ − 1.5 V), and maintains stable performance without requiring dual supplies - simplifying design in single-rail systems such as 3.3 V or 5 V microcontroller-based monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 36 V single supply; enables direct use with 3.3 V, 5 V, 12 V, or 24 V industrial rails |
| Input Offset Voltage | ±3 mV max at 25°C; ensures reliable detection of small analog thresholds (e.g., 10 mV window sensing) |
| Supply Current | 0.4 mA typical at 5 V; supports multi-year battery life in always-on sensor nodes |
| Input Bias Current | 25 nA typical; permits high-impedance sensor interfacing (e.g., thermistors, photodiodes) without loading error |
| Output Sink Current | 16 mA max per channel; drives LEDs, relays, or logic inputs directly without external buffers |
| Input Common-Mode Range | Includes 0 V (ground); allows reference or signal inputs referenced to system GND in single-supply systems |
| Response Time | 1.3 μs typical (100 mV step); sufficient for medium-speed event detection (e.g., overvoltage latch, zero-crossing) |
Pinout & Package
LM393MX is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), optimized for surface-mount reflow assembly and standard PCB footprints.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA (Pin 1) | Open-collector output, Channel A | Sinks current when A-input condition met; requires external pull-up for logic HIGH |
| –INA (Pin 2) | Inverting input, Channel A | Accepts reference or threshold voltage; compatible with GND-referenced signals |
| +INA (Pin 3) | Non-inverting input, Channel A | Accepts sensed signal; supports input voltages up to 36 V regardless of V+ |
| GND (Pin 4) | Ground reference | Common return for both channels; serves as V– in single-supply configurations |
| +INB (Pin 5) | Non-inverting input, Channel B | Independent second sensing path; identical electrical specs to Channel A |
| –INB (Pin 6) | Inverting input, Channel B | Second reference input; usable for dual-threshold or window-comparator topologies |
| OUTB (Pin 7) | Open-collector output, Channel B | Wired-OR capable; shares pull-up with OUTA or uses separate logic rail |
| V+ (Pin 8) | Positive supply | Power input for both comparators; accepts 2.0–36 V DC or connects to +V in dual-supply mode |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation down to 2.0 V | Enables integration into ultra-low-voltage IoT sensors and portable medical devices without level-shifting |
| Input common-mode range includes ground | Eliminates need for negative supply or level-shifting circuitry when sensing near 0 V (e.g., battery discharge monitoring) |
| Output compatible with TTL, CMOS, ECL, MOS | Direct interface to diverse logic families using appropriate pull-up voltage - no translation IC required |
| Low input offset drift over temperature | Maintains accuracy across 0°C–70°C operating range; critical for thermal-stable limit detection in industrial controls |
| Differential input voltage = supply voltage | Allows inputs to swing beyond V+ (up to 36 V), enabling high-side sensing or fault detection in HV systems |
Applications
| Battery Voltage Monitor | Industrial Threshold Detector |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger cutoff or alert at 3.0 V and 4.2 V thresholds. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel for under-voltage, one for over-voltage. Use Value: Leverages rail-to-ground input range and low 0.4 mA supply current to extend battery runtime while maintaining precise 3 mV offset-limited trip points. |
Use Scenario: Detecting pressure switch closure in HVAC control panels where 24 V DC supply powers both sensor and logic. IC Role / Device Role / Timing Role: Single-channel comparator comparing transducer output against fixed resistor-divider reference. Use Value: Uses 24 V single supply directly; open-collector output sinks relay coil current (≤16 mA) without external driver transistor. |
| Zero-Crossing Detector | Logic-Level Translator |
|
Use Scenario: Converting AC line voltage (via resistive divider) into clean 5 V square wave for microcontroller interrupt timing. IC Role / Device Role / Timing Role: Comparator with hysteresis on Channel A, referenced to GND, generating synchronized digital edge transitions. Use Value: Input common-mode range including ground allows direct GND-referenced AC sensing; 1.3 μs response ensures sub-10 μs jitter at 50/60 Hz. |
Use Scenario: Interfacing 3.3 V microcontroller GPIO to 12 V PLC input modules requiring 10–30 V logic HIGH. IC Role / Device Role / Timing Role: Level-shifting comparator with 3.3 V input on +IN and 2.5 V reference on –IN; output pulled to 12 V. Use Value: Output stage tolerates 12 V pull-up independently of 3.3 V V+ supply - no isolation or charge-pump circuitry needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual open-collector comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Same electrical specs and SOIC-8 package; TI's standard tape-and-reel variant with identical parametric performance. | No functional difference; differs only in packaging format (reel vs. tube) and traceability labeling. | Select LM393DR for high-volume SMT production requiring automated pick-and-place compatibility. |
| TLV3702IDR | Lower supply current (1.3 µA typ), rail-to-rail inputs, but higher offset (±3.5 mV) and limited 16 V max supply. | Better for ultra-low-power battery applications; unsuitable for >16 V industrial rails or precision <3 mV thresholds. | Choose TLV3702IDR only when microamp-level quiescent current outweighs voltage range and offset requirements. |
Compared with LM393MX, LM393DR offers identical functionality in a different packaging format ideal for volume manufacturing, while TLV3702IDR trades supply voltage range and offset precision for extreme low-power operation - making it viable only in niche energy-constrained designs.
Availability
LM393MX is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial voltage monitoring, and embedded logic interface applications requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM393MX 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 90 years of innovation in precision analog ICs and broad industrial portfolio coverage.
The LM393MX belongs to TI's legacy precision comparator family, engineered for cost-sensitive, high-reliability applications in consumer, industrial, and automotive systems where robust single-supply operation and GND-referenced sensing are essential.
FAQ
What is the operating temperature range for the LM393MX?
The LM393MX is specified for operation from 0°C to +70°C ambient temperature. This commercial-grade range aligns with standard industrial control and consumer electronics environments. Unlike the LM2903-N (−40°C to +85°C) or LM193-N (−55°C to +125°C), the LM393MX is not rated for extended temperature extremes - verify thermal derating if used near enclosure hotspots or in unventilated enclosures.
Can the LM393MX inputs safely exceed the V+ supply voltage?
Yes - the LM393MX differential input voltage rating is ±36 V, and individual inputs may swing up to 36 V regardless of the V+ supply level. This allows direct high-side sensing (e.g., monitoring 24 V bus voltage with V+ = 5 V). However, input voltages must not go below −0.3 V relative to GND to avoid forward-biasing internal clamp diodes and causing unintended output states.
Does the LM393MX require external pull-up resistors on its outputs?
Yes - the LM393MX features open-collector NPN outputs that can only sink current. A pull-up resistor (typically 2.2 kΩ to 10 kΩ) must be connected between each output pin (OUTA or OUTB) and a logic-compatible voltage rail (e.g., 3.3 V, 5 V, or 12 V). The value depends on required rise time and load current; lower resistance gives faster edges but increases static power draw.
How does the LM393MX handle unused comparator channels?
For unused channels on the LM393MX, tie both inputs (+IN and –IN) to GND and leave the output floating - or connect the output to GND via a 10 kΩ resistor. This prevents noise coupling and ensures stable quiescent current. Do not leave inputs unconnected, as the PNP input stage's 25 nA bias current could cause unpredictable output states due to floating node voltage drift.
Is the LM393MX pin-compatible with other dual comparators like the LM2903?
Yes - the LM393MX shares identical SOIC-8 pinout, electrical characteristics, and functional behavior with the LM2903, LM293-N, and LM193-N in the same package. All feature OUTA/–INA/+INA/GND/+INB/–INB/OUTB/V+ ordering. However, absolute maximum ratings and temperature ranges differ: LM393MX is 0°C–70°C, while LM2903 supports −40°C–85°C - verify thermal compliance before substitution.
LM393MX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 700ns
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM393MX FAQ
1.How can I place an order for LM393MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393MX 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 LM393MX reliable?
The price and inventory of LM393MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393MX is usually 5 days.
3.What payment methods are accepted for LM393MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393MX?
LM393MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393MX 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 LM393MX?
For technical support, including LM393MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393MX requirements.
6.How does Aetrix verify that LM393MX is sourced from the original manufacturer or authorized distributors?
All LM393MX 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 LM393MX meets industry standards.
7.What is the process for return or replacement of LM393MX?
All LM393MX units undergo pre-shipment inspection (PSI). If there is an issue with LM393MX, 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 LM393MX part is unused and in its original packaging.
Return procedure for LM393MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM393MX Tags
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