My Inquiry
My Account
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:3,633
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
The 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, featuring 60µA supply current at 5V, −40°C to +125°C automotive temperature range, and SC70-5 package - used in battery-monitoring circuits for portable medical devices.
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, input common-mode range extending to ground, no phase reversal on overdrive, 100mV output saturation voltage at 1mA sink, and internal hysteresis for noise immunity in slow-signal detection.
Technical Context
The LMX331AXK+T implements a rail-to-rail input CMOS comparator core with open-drain NMOS output stage, enabling direct interface with pull-up voltages up to 5.5V independent of VDD. Its internal hysteresis is fixed at 2mV and temperature-stable (±0.2mV over −40°C to +125°C), eliminating need for external feedback resistors in noisy environments.
It uses submicron CMOS process to achieve 400ns propagation delay (tPLH/tPHL) at 100mV overdrive and 5V supply, while maintaining <7mV input offset voltage across full temperature range and <400nA input bias current at +125°C - outperforming legacy bipolar comparators in PSRR (70dB), CMRR (80dB), and RF immunity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - supports direct connection to Li-ion battery (3.0–4.2V), 3.3V logic, and 1.8V I/O domains without level shifters. |
| Input Offset Voltage | ≤7mV max at +125°C - ensures reliable threshold detection in precision voltage monitoring applications like battery end-of-charge sensing. |
| Propagation Delay | 90ns typical (tPHL), 200ns max (tPLH) at 100mV overdrive and 5V - enables accurate timing in fast-response window comparators. |
| Output Saturation Voltage | 100mV max at 1mA sink - minimizes power loss and improves high-side sensing accuracy when driving LED indicators or MOSFET gates. |
| Supply Current | 60µA per comparator at 5V - allows integration into ultra-low-power wake-up circuits with multi-year battery life in IoT sensors. |
| Input Common-Mode Range | −0.1V to VDD − 0.7V - includes ground reference, enabling direct sensing of 0V-referenced signals such as thermistor or shunt voltage drops. |
| Hysteresis | 2mV internal (LMX331AXK+T is hysteresis version) - suppresses chatter on slowly ramping inputs like temperature ramps or battery voltage decay. |
Pinout & Package
LMX331AXK+T is housed in a 5-pin SC70 package (2.0mm × 2.1mm × 1.0mm), optimized for space-constrained portable designs. Pin assignments are validated per Maxim's official pin configuration diagram (Rev 4, 5/11).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts analog signals down to −0.1V; no phase reversal if overdriven beyond common-mode limits. |
| 2 | VSS | Negative supply terminal - must be connected to system ground; serves as reference for input common-mode and output low state. |
| 3 | IN− | Inverting input - differential pair input node; matched to IN+ for offset control; supports rail-to-rail common-mode operation. |
| 4 | OUT | Open-drain NMOS output - requires external pull-up; sinks up to 37mA at 5V, enabling direct drive of LEDs, optocouplers, or logic inputs. |
| 5 | VDD | Positive supply input - powers internal biasing and output stage; tolerant to 6V absolute max; decoupling with 0.1µF capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 1.8V operation | Enables direct use with single-cell LiFePO₄ (2.5–3.65V) and energy-harvesting systems where supply dips below 2.0V. |
| −40°C to +125°C automotive grade | Qualified for under-hood and infotainment modules; parametric performance fully specified across full temperature range. |
| No phase reversal on overdrive | Prevents false triggering when input exceeds supply rails - critical in fault-detection circuits monitoring overvoltage/undervoltage events. |
| Internal 2mV hysteresis | Eliminates need for external resistor network; reduces BOM count and layout area while ensuring stable switching in EMI-prone environments. |
| Low 60µA supply current | Supports always-on monitoring functions in battery-backed systems (e.g., tamper detection, cold-junction compensation) with negligible quiescent drain. |
Applications
| Battery Voltage Monitor | Thermal Trip Detector |
|---|---|
|
Use Scenario: Monitoring lithium-polymer cell voltage during charge/discharge cycles to trigger cutoff at 2.8V undervoltage and 4.3V overvoltage thresholds. IC Role / Device Role / Timing Role: Single comparator configured as dual-threshold detector using external resistive dividers and internal hysteresis to prevent oscillation near trip points. Use Value: 2mV hysteresis eliminates need for RC filtering; 1.8V min supply allows operation down to depleted battery states; SC70 footprint saves >40% board area vs. SOIC-8 alternatives. |
Use Scenario: Detecting overheating in motor driver PCBs by comparing thermistor voltage against fixed reference in fan-control feedback loop. IC Role / Device Role / Timing Role: Ground-referenced comparator comparing thermistor divider output to precision reference; open-drain output drives N-channel MOSFET gate directly. Use Value: Input common-mode range including ground enables direct thermistor sensing without level-shifting; 100mV output saturation ensures full gate turn-on at low VDD. |
| Low-Power Wake-Up Sensor | Industrial Level Indicator |
|
Use Scenario: Waking microcontroller from deep sleep when ambient light crosses preset threshold via photodiode amplifier output. IC Role / Device Role / Timing Role: Ultra-low-quiescent comparator acting as event-triggered interrupt source; output pulled up to MCU IO voltage. Use Value: 60µA supply current extends coin-cell lifetime beyond 5 years; 90ns propagation delay ensures timely wake-up response to transient light changes. |
Use Scenario: Providing discrete LED-based fluid level indication in industrial tank monitors using resistive float sensor network. IC Role / Device Role / Timing Role: Multi-threshold comparator bank (using multiple LMX331AXK+T units) driving individual LEDs for 4-level visual status display. Use Value: SC70 package allows dense LED-driver array on compact front-panel PCB; 5.5V tolerant output supports 5V LED strings without series resistors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331QDBVRQ1 | Automotive-grade (AEC-Q100), same 5-pin SC70, but no internal hysteresis; 70µA supply current at 5V; 10mV max offset. | Lacks built-in hysteresis - requires external resistor network for noise immunity, increasing component count and layout complexity. | Select when hysteresis is implemented externally or not required; verify PCB layout accommodates added resistors. |
| TLV331IDBVR | Single SC70 comparator, 1.8–5.5V, 55µA supply current, but only rated to +105°C; no guaranteed hysteresis; 9mV max offset. | Not qualified for full automotive temperature range; unsuitable for under-hood or extended-temperature industrial deployments. | Choose for cost-sensitive consumer applications where −40°C to +125°C operation is not required. |
Compared with LMX331AXK+T, LMV331QDBVRQ1 offers AEC-Q100 qualification but adds design overhead for hysteresis, while TLV331IDBVR trades temperature range and hysteresis guarantee for lower unit cost - making LMX331AXK+T optimal for space-constrained, high-reliability automotive and industrial sensing where integrated noise immunity is critical.
Availability
LMX331AXK+T is available at Aetrix Electronics and suitable for battery-powered electronics, automotive subsystems, and portable medical devices requiring stable component supply across extended temperature ranges and long production 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LMX331AXK+T belongs to Maxim's LMX331/LMX393/LMX339 family of tiny-pack comparators - engineered specifically for low-voltage, space-constrained, and automotive-qualified signal conditioning in portable and harsh-environment systems.
FAQ
What is the maximum supply voltage rating for the LMX331AXK+T?
The LMX331AXK+T has an absolute maximum supply voltage (VDD to VSS) of +6V. Operation above 5.5V is not recommended for functional reliability. The device is fully specified from 1.8V to 5.5V, with guaranteed performance including input common-mode range, propagation delay, and output saturation voltage across this range. Exceeding 6V may cause permanent damage per Absolute Maximum Ratings table.
Does the LMX331AXK+T require external hysteresis components?
No, the LMX331AXK+T includes internal 2mV hysteresis as a standard feature - confirmed in the General Description, Features list, and Detailed Description sections of the datasheet. This eliminates the need for external positive-feedback resistors in most noise-immune threshold detection applications, reducing bill-of-materials count and PCB area. External hysteresis can still be added if wider band is required.
Is the LMX331AXK+T pin-compatible with the LMV331?
Yes, the LMX331AXK+T is explicitly described as a drop-in, pin-for-pin-compatible replacement for the LMV331 in the General Description. Both use identical 5-pin SC70 pinout (IN+, VSS, IN−, OUT, VDD), share supply voltage range (1.8V–5.5V), and match key electrical parameters including supply current, propagation delay, and input offset voltage - enabling direct substitution without layout changes.
What is the output configuration of the LMX331AXK+T?
The LMX331AXK+T features an open-drain NMOS output stage (pin 4), requiring an external pull-up resistor to define the high-state voltage. It sinks up to 37mA at 5V supply and exhibits ≤100mV saturation voltage at 1mA sink current. This configuration allows level translation, wired-OR logic, and direct interface with diverse logic families or loads such as LEDs and MOSFET gates.
Can the LMX331AXK+T operate with input voltages below ground?
Yes, the LMX331AXK+T supports an input common-mode voltage range extending to −0.1V below VSS (ground), as specified in DC Electrical Characteristics tables and Detailed Description. This enables direct sensing of slightly negative signals - for example, in current-sense amplifiers with bidirectional shunt configurations or transducer outputs with small negative excursions - without requiring level-shifting circuitry.
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.
LMX331AXK+T Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP USA Inc.
Tech Hub
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
A practical guide to blend door actuators, covering HVAC function, symptoms, location, AC and heater issues, reset and calibration, replacement cost, electrical diagnosis, compatibility checks, and rep…
