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Analog Devices Inc./Maxim Integrated LMX331AXK-T
- Part No.:
- LMX331AXK-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMX331AXK-T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,622
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Product details
Overview
LMX331AXK-T from Maxim Integrated is a single-channel, low-voltage, open-drain 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 features 60µA supply current at 5V, 100mV output saturation voltage at 1mA sink, and input common-mode range extending to ground. It is used in battery-powered voltage monitoring circuits where noise immunity and rail-to-rail input capability are critical.
For engineers reviewing the LMX331AXK-T datasheet, LMX331AXK-T pinout, LMX331AXK-T application, or LMX331AXK-T equivalent, key selection criteria include guaranteed 1.8V operation, internal hysteresis for slow-signal stability, SC70-5 package footprint compatibility with LMV331, and automotive-grade thermal performance without external components.
Technical Context
The LMX331AXK-T implements a CMOS-input, open-drain output architecture optimized for low-power, single-supply operation. Its input stage supports common-mode voltages from -0.1V to VDD–0.7V, enabling direct ground-referenced sensing. The internal 2mV hysteresis eliminates need for external positive feedback networks in noisy environments.
It delivers 90ns typical propagation delay (tPHL/tPLH) at 100mV overdrive and 5V supply, with PSRR of 60–70dB across 1.8V–5.5V. Input offset voltage is specified at ≤9mV over full temperature range, and output leakage remains ≤2µA at +125°C - critical for high-impedance threshold detection.
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 level shifting. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial edge-node applications. |
| Supply Current | 60µA per comparator at 5V - supports multi-year battery life in always-on sensor monitors. |
| Input Offset Voltage | ≤9mV max over full temperature range - ensures stable trip-point accuracy in precision threshold detection. |
| Output Saturation Voltage | 100mV at 1mA sink - minimizes voltage drop when driving pull-up resistors or logic inputs. |
| Hysteresis | 2mV internal - suppresses chatter on slow-moving or noisy signals without external components. |
| Propagation Delay | 90ns typical (100mV overdrive, 5V) - suitable for sub-microsecond response in power sequencing and fault detection. |
Pinout & Package
LMX331AXK-T is housed in a 5-pin SC70 package (2.0mm × 2.1mm × 1.0mm), optimized for space-constrained portable and automotive PCBs. The package is RoHS-compliant and compatible with standard reflow profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts ground-referenced or rail-to-rail analog signals up to VDD–0.7V. |
| 2 | VSS | Negative supply terminal - must be connected to system ground; supports input common-mode down to -0.1V. |
| 3 | IN- | Inverting input - used for reference comparison; no phase reversal occurs even when overdriven. |
| 4 | OUT | Open-drain output - requires external pull-up; sinks up to 73mA at 5V, enabling direct interface with 1.8V/3.3V/5V logic. |
| 5 | VDD | Positive supply - powers internal circuitry; bypassing with 0.1µF capacitor near this pin is mandatory for stability. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2mV hysteresis | Eliminates external resistor network for noise immunity - reduces BOM count and layout sensitivity in battery monitor designs. |
| Ground-sensing input range | Supports direct connection of IN– to GND and IN+ to battery or sensor output - removes need for level-shifting amplifiers. |
| Low 60µA supply current | Enables continuous operation in energy-harvesting or coin-cell-powered systems with >5-year runtime at 1Hz wake-up. |
| Open-drain output with 73mA sink | Drives standard pull-up resistors (e.g., 10kΩ to 3.3V) while maintaining <100mV VOL - ensures clean logic-level transitions. |
| Automotive temperature qualification | Guaranteed functionality from -40°C to +125°C - validated for engine control modules, ADAS sensors, and infotainment power supervisors. |
Applications
| Battery Voltage Monitor | Automotive Power Sequencer |
|---|---|
|
Use Scenario: Real-time monitoring of Li-ion cell voltage during charging/discharging cycles in portable medical devices. IC Role / Device Role / Timing Role: Single comparator detecting under-voltage lockout (UVLO) and over-voltage protection (OVP) thresholds with hysteresis. Use Value: Internal 2mV hysteresis prevents false triggering from ripple or ESD transients, eliminating need for RC filtering and saving board space. |
Use Scenario: Controlled power-up sequence for multi-rail ECUs in ADAS domain controllers. IC Role / Device Role / Timing Role: Comparator verifying 5V rail stability before enabling 3.3V and 1.2V regulators via open-drain enable signals. Use Value: Guaranteed operation at +125°C ensures reliable sequencing under hood temperatures, with 60µA quiescent current minimizing standby loss. |
| Portable Device Wake-Up Sensor | Industrial Threshold Detector |
|
Use Scenario: Motion-triggered wake-up in handheld test equipment using piezoelectric sensor output. IC Role / Device Role / Timing Role: Low-power comparator comparing sensor signal against adjustable threshold to assert interrupt to MCU. Use Value: 1.8V minimum supply allows direct use of partially discharged batteries; ground-referenced inputs simplify sensor interface design. |
Use Scenario: Over-temperature alert in motor drive inverters using NTC thermistor voltage divider. IC Role / Device Role / Timing Role: Precision comparator detecting thermistor voltage crossing preset threshold to trigger shutdown logic. Use Value: ≤9mV max input offset ensures consistent trip point across temperature, reducing calibration overhead in production test. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331IDCKR | No internal hysteresis; 1.65V–5.5V supply; 75µA supply current at 5V; same SC70-5 pinout. | Suitable where external hysteresis is acceptable or preferred; lacks built-in noise immunity for slow signals. | Select LMV331IDCKR only if hysteresis is added externally and lower cost is prioritized over design simplicity. |
| TLV331DBVR | 1.8V–5.5V supply; 55µA supply current; no internal hysteresis; rail-to-rail input; SC70-5 package. | Offers better input common-mode range (to VDD) but requires external hysteresis network for noise-prone environments. | Choose TLV331DBVR when rail-to-rail input swing beyond VDD–0.7V is required, and layout allows for two external resistors. |
Compared with LMX331AXK-T, LMV331IDCKR and TLV331DBVR both lack integrated hysteresis - requiring external components for noise immunity - whereas LMX331AXK-T delivers deterministic 2mV hysteresis in the same footprint, reducing design iteration time and improving reliability in automotive and battery-critical systems.
Availability
LMX331AXK-T is available at Aetrix Electronics and suitable for battery-powered electronics, automotive power supervision, and portable device voltage monitoring requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for LMX331AXK-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 precision analog and mixed-signal ICs for demanding industrial, automotive, and communications applications.
The LMX331 series belongs to Maxim's general-purpose low-voltage comparator family, engineered specifically for space-constrained, battery-sensitive systems requiring guaranteed operation across automotive temperature extremes without external hysteresis components.
FAQ
What is the maximum supply voltage rating for LMX331AXK-T?
The absolute maximum supply voltage (VDD to VSS) for LMX331AXK-T is +6V. Operation above 5.5V is not recommended, as electrical specifications are only guaranteed from 1.8V to 5.5V. Exceeding +6V may cause permanent damage, and derating guidelines apply above +70°C ambient.
Does LMX331AXK-T require external hysteresis components?
No, LMX331AXK-T includes 2mV of internal hysteresis, eliminating the need for external resistors in most noise-immune threshold detection applications. This feature is inherent to the "H" variant designation and is fully characterized across -40°C to +125°C.
Can LMX331AXK-T interface directly with 1.8V logic systems?
Yes, LMX331AXK-T operates down to 1.8V supply and its open-drain output can be pulled up to 1.8V, making it fully compatible with 1.8V logic families. Output saturation voltage remains ≤35mV at 1mA sink under 1.8V conditions, ensuring robust low-state signaling.
What is the input common-mode voltage range of LMX331AXK-T?
The input common-mode voltage range of LMX331AXK-T extends from -0.1V below VSS (ground) to VDD – 0.7V. This allows direct sensing of signals referenced to ground - such as battery voltage or thermistor dividers - without level-shifting circuitry.
Is LMX331AXK-T pin-compatible with LMV331?
Yes, LMX331AXK-T is a drop-in, pin-for-pin replacement for LMV331 in the SC70-5 package. Both share identical pinout (IN+, VSS, IN-, OUT, VDD), footprint, and solder-reflow profile, enabling direct substitution without PCB modification.
LMX331AXK-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- 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
- :
- SC-70-5
LMX331AXK-T FAQ
1.How can I place an order for LMX331AXK-T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX331AXK-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 LMX331AXK-T reliable?
The price and inventory of LMX331AXK-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX331AXK-T is usually 5 days.
3.What payment methods are accepted for LMX331AXK-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX331AXK-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX331AXK-T?
LMX331AXK-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX331AXK-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 LMX331AXK-T?
For technical support, including LMX331AXK-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX331AXK-T requirements.
6.How does Aetrix verify that LMX331AXK-T is sourced from the original manufacturer or authorized distributors?
All LMX331AXK-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 LMX331AXK-T meets industry standards.
7.What is the process for return or replacement of LMX331AXK-T?
All LMX331AXK-T units undergo pre-shipment inspection (PSI). If there is an issue with LMX331AXK-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 LMX331AXK-T part is unused and in its original packaging.
Return procedure for LMX331AXK-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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