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Analog Devices Inc./Maxim Integrated LMX393AUA+
- Part No.:
- LMX393AUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LMX393AUA+.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,249
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Product details
Overview
LMX393AUA+ from Maxim Integrated is a dual, open-drain, low-voltage comparator with internal 2mV hysteresis, operating from 1.8V to 5.5V supply and rated for -40°C to +125°C automotive temperature range. It delivers 60µA per comparator supply current at 5V, 100ns propagation delay (100mV overdrive), and 100mV output saturation voltage at 1mA sink load - enabling robust threshold detection in battery-powered automotive sensor interfaces.
For engineers reviewing the LMX393AUA+ datasheet, LMX393AUA+ pinout, LMX393AUA+ application, or LMX393AUA+ equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and confirmed drop-in alternatives for noise-immune comparator design in space-constrained, high-temperature environments.
Technical Context
The LMX393AUA+ implements a rail-to-rail input stage with common-mode range extending from -0.1V below VSS to within 0.7V of VDD, supporting ground-referenced sensing without level-shifting. Its internal hysteresis eliminates oscillation on slow-moving or noisy inputs by establishing distinct rising/falling trip thresholds separated by 2mV.
Designed in submicron CMOS, it achieves superior PSRR (70dB at 1.8V) and CMRR versus bipolar comparators, while delivering 50V/mV small-signal voltage gain and no phase reversal under overdriven conditions - critical for reliable operation in EMI-prone automotive subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion, 3.3V, and 5V logic rails without regulators |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial control applications |
| Supply Current per Comparator | 60µA at VDD = 5.0V - supports multi-year battery life in always-on monitoring circuits |
| Propagation Delay | 90ns (tPHL) / 200ns (tPLH) at 100mV overdrive, 5V - ensures timely response in fast edge-detection systems |
| Input Offset Voltage | Max 9mV over full temperature range - maintains accuracy in precision thresholding without trimming |
| Output Saturation Voltage | 100mV at ISINK = 1mA - minimizes power loss and improves noise margin when driving pull-up loads |
| Hysteresis | 2mV (internal, fixed) - suppresses chatter on millivolt-level noise without external components |
Pinout & Package
LMX393AUA+ is housed in an 8-pin µMAX® package (3.0mm × 3.0mm × 1.1mm, 0.65mm pitch), optimized for high-density PCB layouts in automotive modules and portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input - must be bypassed with 0.1µF capacitor to VSS for stable operation |
| 2 | OUTA | Open-drain output of comparator A - requires external pull-up to define logic HIGH level |
| 3 | INA− | Inverting input of comparator A - accepts signals down to −0.1V relative to VSS |
| 4 | INA+ | Noninverting input of comparator A - supports rail-to-rail common-mode range |
| 5 | VSS | Negative supply (GND) - return path for all currents; low-impedance connection required |
| 6 | INB+ | Noninverting input of comparator B - electrically isolated from INA+; no crosstalk |
| 7 | INB− | Inverting input of comparator B - identical electrical characteristics to INA− |
| 8 | OUTB | Open-drain output of comparator B - independently configurable with separate pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2mV hysteresis | Eliminates need for external positive feedback resistors in noisy environments like motor control feedback loops |
| Rail-to-rail input common-mode range | Supports direct sensing of 0V-referenced battery voltage or thermistor dividers without bias networks |
| No phase reversal on overdrive | Prevents false triggering when input differential exceeds ±100mV - essential for fault-detection circuits |
| Low 100mV output saturation | Reduces voltage drop across pull-up resistors, improving speed and reducing power in 3.3V I²C-compatible interfaces |
| 70dB PSRR at 1.8V | Maintains stable trip points despite supply ripple from switching regulators in compact power supplies |
Applications
| Battery Voltage Monitor | Automotive Cabin Temperature Control |
|---|---|
Use Scenario: Detecting low-battery condition in 12V automotive accessory modules using resistor divider from battery rail. IC Role / Device Role / Timing Role: Dual comparator performs undervoltage lockout (UVOO) and overvoltage warning with independent thresholds. Use Value: Internal hysteresis prevents relay chatter during engine cranking transients; 125°C rating ensures reliability near HVAC blower motors. |
Use Scenario: Comparing NTC thermistor voltage against reference to trigger HVAC fan speed changes in passenger compartment. IC Role / Device Role / Timing Role: One comparator monitors cold threshold, the other monitors hot threshold - enabling hysteresis-based zone control. Use Value: Rail-to-rail inputs accept 0–5V thermistor outputs directly; 60µA total quiescent current extends module sleep-mode battery life. |
| Notebook Power Sequencing | Industrial Sensor Interface Module |
Use Scenario: Validating proper ramp-up of core and I/O voltages before releasing processor reset in ultra-thin laptops. IC Role / Device Role / Timing Role: Dual comparator acts as independent power-good detector for VCC_CORE and VCC_IO rails. Use Value: 90ns tPHL ensures fast response to brownout events; 1.8V minimum supply allows integration into low-power auxiliary domains. |
Use Scenario: Converting analog outputs from pressure and humidity sensors into digital status flags for PLC input cards. IC Role / Device Role / Timing Role: Each comparator digitizes one sensor channel with programmable threshold via external resistive dividers. Use Value: No phase reversal guarantees clean transitions even during sensor cable ESD events; 125°C rating supports enclosure mounting near heat-generating drives. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual open-drain comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV393IDR | No internal hysteresis; wider offset voltage spec (±7mV vs ±4.5mV max); 1.65V min supply | Lacks built-in noise immunity - requires external hysteresis resistors for same reliability in noisy environments | Select when cost sensitivity outweighs need for integrated hysteresis and board space is not constrained |
| TLV3702IDR | Push-pull output (not open-drain); 1.8V–10V supply; 350nA typical supply current | Cannot wire-OR outputs; incompatible with I²C-style shared-bus configurations requiring open-drain topology | Choose only if push-pull drive and higher supply voltage range are mandatory, and bus sharing is unnecessary |
Compared with LMX393AUA+, LMV393IDR requires additional components for noise immunity and offers lower cost but reduced system-level robustness, while TLV3702IDR trades open-drain flexibility for ultra-low power and higher voltage capability - neither is pin-compatible, and both demand layout revision.
Availability
LMX393AUA+ is available at Aetrix Electronics and suitable for automotive cabin control, battery management systems, and industrial sensor interface applications requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX393AUA+ 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LMX393AUA+ belongs to Maxim's LMX3xx family of tiny-pack comparators, engineered specifically for low-voltage, high-temperature, space-constrained applications where noise immunity and supply flexibility are critical.
FAQ
What is the maximum sink current capability of each output in LMX393AUA+?
Each open-drain output of the LMX393AUA+ supports up to 73mA sink current at VO ≤ 1.5V and VDD = 5V, with typical performance of 100mA at 25°C. This allows direct driving of LEDs, small relays, or MOSFET gates without external buffers - a key advantage over micropower comparators limited to <10mA.
Does LMX393AUA+ require external hysteresis resistors for stable operation?
No - the LMX393AUA+ integrates 2mV of internal hysteresis, eliminating the need for external positive feedback resistors in most noise-prone applications. This simplifies layout, reduces BOM count, and ensures consistent hysteresis across temperature and supply voltage, unlike discrete resistor solutions subject to drift.
Can LMX393AUA+ operate from a single 1.8V supply?
Yes - the LMX393AUA+ is fully specified from 1.8V to 5.5V supply voltage. At 1.8V, it maintains 40µA per comparator supply current, 500ns propagation delay (10mV overdrive), and functional rail-to-rail input range, making it suitable for energy-harvesting and coin-cell-powered systems where ultra-low voltage operation is essential.
Is LMX393AUA+ pin-compatible with LMV393?
Yes - the LMX393AUA+ is explicitly designed as a drop-in, pin-for-pin replacement for LMV393 in 8-pin µMAX® packages. Both share identical pinout, supply voltage range, and open-drain output structure, enabling seamless migration without PCB redesign or firmware changes.
What is the input common-mode voltage range of LMX393AUA+?
The LMX393AUA+ supports an input common-mode voltage range from −0.1V below VSS to VDD − 0.7V. This rail-to-rail capability enables direct interfacing with ground-referenced sensors (e.g., thermistors, current shunts) and eliminates the need for input biasing networks - a critical feature for low-component-count designs.
LMX393AUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Drain
- Voltage - Supply, Single/Dual (±):
- 1.8V ~ 5.5V
- :
- 7mV @ 5V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 73mA @ 5V
- Current - Output (Typ):
- 200µA
- Current - Quiescent (Max):
- 70dB PSRR
- CMRR, PSRR (Typ):
- 600ns
- Propagation Delay (Max):
- 2mV
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-uMAX/uSOP
LMX393AUA+ FAQ
1.How can I place an order for LMX393AUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX393AUA+ 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 LMX393AUA+ reliable?
The price and inventory of LMX393AUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX393AUA+ is usually 5 days.
3.What payment methods are accepted for LMX393AUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX393AUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX393AUA+?
LMX393AUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX393AUA+ 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 LMX393AUA+?
For technical support, including LMX393AUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX393AUA+ requirements.
6.How does Aetrix verify that LMX393AUA+ is sourced from the original manufacturer or authorized distributors?
All LMX393AUA+ 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 LMX393AUA+ meets industry standards.
7.What is the process for return or replacement of LMX393AUA+?
All LMX393AUA+ units undergo pre-shipment inspection (PSI). If there is an issue with LMX393AUA+, 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 LMX393AUA+ part is unused and in its original packaging.
Return procedure for LMX393AUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX393AUA+ Tags
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