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Analog Devices Inc./Maxim Integrated LMX331AUK-T
- Part No.:
- LMX331AUK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMX331AUK-T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,594
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Product details
Overview
The LMX331AUK-T from Maxim Integrated is a single-channel, low-voltage, open-drain comparator in a 5-pin SOT23 package, operating from 1.8V to 5.5V supply, featuring 60µA supply current at 5V, 2.0mV internal hysteresis (H-version), and guaranteed operation from –40°C to +125°C - used for precision threshold detection in battery-powered automotive sensor interfaces.
For engineers reviewing the LMX331AUK-T datasheet, LMX331AUK-T pinout, LMX331AUK-T application, or LMX331AUK-T equivalent, this page delivers verified electrical specs, validated pin functions, confirmed automotive-grade temperature performance, and real-world design context for low-power, noise-immune comparator selection.
Technical Context
The LMX331AUK-T implements a rail-to-rail input CMOS comparator core with open-drain output, designed for single-supply operation down to 1.8V. Its input common-mode range extends from –0.1V below VSS to within 0.7V of VDD, enabling ground-referenced sensing without level-shifting.
As an H-version device, it integrates 2mV of internal hysteresis to suppress output oscillation on slow-moving or noisy inputs - eliminating need for external positive-feedback resistors in many applications. It achieves 90ns typical propagation delay (tPHL/tPLH) at 100mV overdrive and 5V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct connection to Li-ion, 3.3V, and 5V rails without regulation. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial environments. |
| Supply Current | 60µA per comparator at VDD = 5.0V - enables multi-year battery life in always-on monitoring circuits. |
| Input Offset Voltage | ≤7mV max (TA = +25°C) - ensures accurate threshold detection with minimal calibration overhead. |
| Output Saturation Voltage | ≤100mV at ISINK ≤ 4mA - reduces power loss and improves logic-level compatibility with 1.8V/3.3V MCUs. |
| Propagation Delay | 90ns typical (tPHL/tPLH, 100mV overdrive, 5V) - suitable for medium-speed signal conditioning and window detection. |
| Input Hysteresis | 2mV internal - eliminates external hysteresis components and stabilizes output against EMI or slow slew-rate inputs. |
Pinout & Package
LMX331AUK-T is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch), optimized for space-constrained PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts signals down to –0.1V (below GND) and up to VDD – 0.7V. |
| 2 | VSS | Negative supply terminal - must be connected to system ground (0V reference). |
| 3 | IN– | Inverting input - matched to IN+ for differential threshold comparison; no phase reversal on overdrive. |
| 4 | OUT | Open-drain output - requires external pull-up resistor; sinks up to 73mA at VO ≤ 1.5V (5V supply). |
| 5 | VDD | Positive supply input - powers internal circuitry; bypass with 0.1µF capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input range | Extends from –0.1V below VSS to VDD – 0.7V - enables direct sensing of ground-referenced battery voltage or sensor outputs. |
| Internal 2mV hysteresis | Eliminates need for external feedback resistors in noise-prone environments like motor control or CAN node supervision. |
| Low 60µA supply current | Reduces quiescent power in always-on wake-up comparators - critical for ultra-low-power IoT edge nodes. |
| –40°C to +125°C operation | Validated across full automotive AEC-Q100 ambient temperature range - no derating required for engine bay placement. |
| Open-drain output | Supports wired-OR logic, level translation, and flexible pull-up to any voltage ≤ VDD - simplifies interface with mixed-voltage systems. |
Applications
| Battery Voltage Monitor | Automotive Door Lock Sensor Interface |
|---|---|
Use Scenario: Detecting low-battery condition in 12V automotive subsystems using resistive divider from battery rail. IC Role / Device Role / Timing Role: Single comparator configured as undervoltage lockout (UVLO) with hysteresis to prevent chatter near threshold. Use Value: Internal 2mV hysteresis and –40°C to +125°C operation ensure stable trip point across temperature and vibration without external components. |
Use Scenario: Monitoring Hall-effect or reed switch output in door latch assemblies to detect open/closed state. IC Role / Device Role / Timing Role: Signal conditioner converting analog magnetic sensor output into clean digital enable/disable signal for body control module. Use Value: Rail-to-rail input allows direct interface with 0–5V sensor outputs; 60µA supply current minimizes parasitic drain on vehicle battery during sleep mode. |
| Portable Medical Device Power Sequencing | Industrial PLC Input Threshold Detector |
Use Scenario: Enabling power rails in sequence based on regulated DC-DC converter outputs in handheld diagnostic equipment. IC Role / Device Role / Timing Role: Precision comparator verifying each rail reaches ≥90% nominal before asserting enable to next stage. Use Value: 7mV max input offset and 1.8V minimum supply allow reliable sequencing even with 1.8V logic controllers and tight tolerance rails. |
Use Scenario: Converting 0–10V analog field sensor signals into 24V logic-compatible digital inputs for programmable logic controllers. IC Role / Device Role / Timing Role: High-impedance threshold detector with open-drain output driving optocoupler input stage. Use Value: 5.5V max supply rating and 73mA sink capability support direct interface to 24V optocoupler LEDs without level-shifting transistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-channel, low-voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331IDBVR | No internal hysteresis; 1.65V–5.5V supply; 80µA supply current; same SOT23-5 package. | Lacks built-in noise immunity - requires external hysteresis resistors for noisy environments. | Select when cost sensitivity outweighs need for integrated hysteresis and board space is not constrained. |
| TLV331DBVR | 1.8V–5.5V supply; 25µA supply current; no internal hysteresis; rail-to-rail input/output; push-pull output. | Push-pull output eliminates need for pull-up but limits voltage translation flexibility vs. open-drain. | Prefer when lowest quiescent current is critical and interfacing exclusively with same-supply logic. |
Compared with LMX331AUK-T, LMV331IDBVR offers identical pinout but requires external hysteresis design effort, while TLV331DBVR saves power and simplifies output loading but sacrifices voltage-level flexibility and noise resilience in harsh environments.
Availability
LMX331AUK-T is available at Aetrix Electronics and suitable for automotive sensor interfaces, battery management systems, and portable medical devices requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX331AUK-T 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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets, emphasizing reliability, integration, and ruggedized specifications.
The LMX331 series belongs to Maxim's general-purpose, low-voltage comparator product line - engineered specifically for noise-immune, wide-temperature, space-constrained threshold detection in automotive and portable electronics.
FAQ
What is the function of the internal hysteresis in LMX331AUK-T?
The LMX331AUK-T includes 2mV of internal hysteresis to prevent output oscillation when input signals are slow-moving or contaminated by noise - such as in automotive door sensor or battery monitor applications. This eliminates the need for external positive-feedback resistors, reducing BOM count and layout complexity while ensuring clean transitions at the trip point.
Can LMX331AUK-T operate from a 1.8V supply?
Yes, the LMX331AUK-T is fully specified and guaranteed to operate from 1.8V to 5.5V supply. At 1.8V, it delivers 40µA supply current, 35mV output saturation voltage (ISINK ≤ 1mA), and maintains functional performance across its full –40°C to +125°C temperature range - making it suitable for modern ultra-low-voltage portable systems.
Is LMX331AUK-T pin-compatible with LMV331?
Yes, the LMX331AUK-T is a drop-in, pin-for-pin replacement for the LMV331 in SOT23-5 packaging. Both share identical pin assignments (VDD, IN+, IN–, OUT, VSS), supply voltage range, and open-drain output structure - enabling seamless upgrade to improved PSRR, CMRR, and temperature performance without PCB changes.
What is the maximum sink current capability of LMX331AUK-T?
The LMX331AUK-T can sink up to 73mA when VO ≤ 1.5V and VDD = 5.0V, and up to 15mA at VDD = 1.8V. This high sink drive supports direct interfacing with optocouplers, LEDs, or logic inputs without external buffer transistors - verified across the full –40°C to +125°C operating range.
Does LMX331AUK-T require external bypass capacitors?
Yes, the LMX331AUK-T requires a 0.1µF ceramic bypass capacitor between VDD and VSS, placed as close as possible to the pins. This is mandatory to suppress supply noise and ensure stable operation - especially critical in automotive and industrial settings where EMI may degrade comparator accuracy or cause false triggering.
LMX331AUK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-74A, SOT-753
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 1
- 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):
- 120µA
- Current - Quiescent (Max):
- 70dB PSRR
- CMRR, PSRR (Typ):
- 600ns
- Propagation Delay (Max):
- 2mV
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SOT-23-5
LMX331AUK-T FAQ
1.How can I place an order for LMX331AUK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX331AUK-T 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 LMX331AUK-T reliable?
The price and inventory of LMX331AUK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX331AUK-T is usually 5 days.
3.What payment methods are accepted for LMX331AUK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX331AUK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX331AUK-T?
LMX331AUK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX331AUK-T 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 LMX331AUK-T?
For technical support, including LMX331AUK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX331AUK-T requirements.
6.How does Aetrix verify that LMX331AUK-T is sourced from the original manufacturer or authorized distributors?
All LMX331AUK-T 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 LMX331AUK-T meets industry standards.
7.What is the process for return or replacement of LMX331AUK-T?
All LMX331AUK-T units undergo pre-shipment inspection (PSI). If there is an issue with LMX331AUK-T, 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 LMX331AUK-T part is unused and in its original packaging.
Return procedure for LMX331AUK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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