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Analog Devices Inc./Maxim Integrated LMX331HAXK+T
- Part No.:
- LMX331HAXK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMX331HAXK+T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,285
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Product details
Overview
The LMX331HAXK+T from Maxim Integrated is a single-channel, low-voltage, open-drain comparator with internal 2mV hysteresis, designed for noise-immune threshold detection in automotive and portable systems. It operates from 1.8V to 5.5V, delivers 60µA supply current at 5V, achieves 90ns propagation delay (tPHL) at 100mV overdrive, and supports –40°C to +125°C operation - used in battery voltage monitoring and wake-up signal conditioning.
For engineers reviewing the LMX331HAXK+T datasheet, LMX331HAXK+T pinout, LMX331HAXK+T application, or LMX331HAXK+T equivalent, key selection criteria include guaranteed hysteresis, rail-to-rail input range including ground, low output saturation voltage (100mV @ 1mA), and SC70-5 package compatibility with space-constrained PCB layouts.
Technical Context
The LMX331HAXK+T implements a CMOS-input, open-drain output architecture optimized for low-voltage operation down to 1.8V while maintaining robust input common-mode range (–0.1V to VDD – 0.7V). Its internal hysteresis eliminates need for external feedback resistors in noisy environments.
It features no phase reversal under overdriven inputs, 70dB PSRR at 1.8V, and 50V/mV small-signal voltage gain - enabling stable comparison of slowly varying signals such as thermistor outputs or battery voltage ramps without oscillation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct interface with Li-ion battery (3.0–4.2V), 3.3V logic, and 1.8V microcontrollers without level-shifting. |
| Input Offset Voltage | ≤9mV (–40°C to +125°C) - ensures accurate trip-point stability across full automotive temperature range. |
| Hysteresis | 2mV (internal, fixed) - suppresses chatter on slow-moving or noisy inputs like sensor outputs or power-good signals. |
| Propagation Delay | 90ns (tPHL, 100mV overdrive, VDD = 5V) - supports fast response in overvoltage/undervoltage fault detection circuits. |
| Output Saturation Voltage | 100mV @ ISINK = 1mA - minimizes voltage drop when driving pull-up loads, preserving margin for downstream logic thresholds. |
| Supply Current | 60µA per comparator @ VDD = 5V - extends battery life in always-on monitoring applications such as vehicle intrusion detection. |
| Input Common-Mode Range | Includes ground (–0.1V to VDD – 0.7V) - allows direct sensing of 0V-referenced signals like current-sense shunts or battery negative terminals. |
Pinout & Package
LMX331HAXK+T is housed in a 5-pin SC70 package (2.0mm × 2.1mm × 1.0mm), optimized for high-density PCB layouts in automotive and portable electronics.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts reference or sensed signal; supports common-mode down to –0.1V (below ground). |
| 2 | VSS | Negative supply terminal - must be connected to system ground; defines reference for all inputs and output. |
| 3 | IN− | Inverting input - compares against IN+; no phase reversal even when overdriven beyond supply rails. |
| 4 | OUT | Open-drain output - requires external pull-up; sinks up to 10mA; compatible with mixed-voltage logic interfaces. |
| 5 | VDD | Positive supply input - powers internal circuitry; supports 1.8V–5.5V operation with <1µA leakage at VDD = 1.8V. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2mV hysteresis | Eliminates need for external positive feedback resistors in noise-prone environments like engine control units or motor drives. |
| Rail-to-rail input including ground | Enables direct measurement of signals referenced to system ground - e.g., battery cell voltage or shunt-based current sensing. |
| –40°C to +125°C operation | Qualified for under-hood automotive use and industrial edge nodes without derating or thermal management overhead. |
| Low 60µA supply current @ 5V | Reduces quiescent power in always-on battery monitors - critical for >10-year service life in telematics modules. |
| No phase reversal on overdrive | Prevents false triggering when inputs exceed supply rails - essential for robustness in unregulated or transient-heavy power domains. |
Applications
| Battery Voltage Monitoring | Automotive Wake-Up Detection |
|---|---|
Use Scenario: Monitoring Li-ion battery pack voltage during sleep mode to trigger wake-up before deep discharge. IC Role / Device Role / Timing Role: Single comparator detecting crossing of 3.0V threshold with hysteresis to reject ripple-induced false triggers. Use Value: Internal 2mV hysteresis prevents oscillation on battery voltage droop caused by leakage currents or EMI, ensuring reliable low-power state transitions. |
Use Scenario: Detecting door-open or hood-latch signals in body control modules to initiate CAN bus wake-up sequence. IC Role / Device Role / Timing Role: Open-drain comparator interfacing mechanical switch to 5V or 3.3V microcontroller GPIO with pull-up. Use Value: Input common-mode range including ground allows direct switch-to-ground connection without biasing resistors, reducing BOM count and layout area. |
| Overvoltage Protection Circuit | Thermal Trip Detection |
Use Scenario: Fast shutdown of DC-DC converter output if regulated rail exceeds 5.25V due to feedback failure. IC Role / Device Role / Timing Role: High-speed comparator comparing output voltage against precision reference; output drives MOSFET gate driver. Use Value: 90ns propagation delay at 5V ensures sub-100ns fault response - faster than most microcontroller-based monitoring loops. |
Use Scenario: Converting NTC thermistor resistance change into digital trip signal for fan control or processor throttling. IC Role / Device Role / Timing Role: Comparator with resistor-divider reference generating clean on/off transition at 85°C. Use Value: Guaranteed 1.8V operation allows direct interface with low-voltage analog front-ends, eliminating need for auxiliary supply rails. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331M5X/NOPB | No internal hysteresis; wider offset drift (±4.5µV/°C vs. ±5µV/°C); same SC70-5 package and pinout. | Requires external hysteresis resistors for noise immunity - increases component count and layout complexity. | Select when cost sensitivity outweighs noise immunity needs and board space permits external components. |
| TLV331IDCKR | Lower supply current (55µA @ 5V); no hysteresis; 1.5V min supply; different pinout (IN+, VDD, IN−, OUT, GND). | Not pin-compatible; requires PCB redesign; lacks automotive temp grade (–40°C to +125°C) - rated only to +125°C. | Choose for ultra-low-power consumer devices where automotive qualification is unnecessary and layout flexibility exists. |
Compared with LMX331HAXK+T, LMV331M5X/NOPB offers identical form factor but demands external hysteresis design effort, while TLV331IDCKR trades automotive reliability and pin compatibility for marginal supply current reduction - making LMX331HAXK+T optimal for production-grade automotive and industrial monitoring.
Availability
LMX331HAXK+T is available at Aetrix Electronics and suitable for battery voltage monitoring, automotive wake-up detection, and overvoltage protection requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX331HAXK+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 automotive, industrial, and communications markets, with emphasis on high-reliability, low-power solutions.
The LMX331HAXK+T belongs to Maxim's LMX331 family of tiny-pack comparators, engineered specifically for noise-immune, low-voltage threshold detection in space- and power-constrained automotive and portable systems.
FAQ
What is the operating temperature range of the LMX331HAXK+T?
The LMX331HAXK+T is specified for continuous operation from –40°C to +125°C, fully qualified for under-hood automotive applications and industrial environments. This rating is guaranteed across all electrical parameters in the datasheet, including input offset voltage, propagation delay, and supply current - no derating required within this range.
Does the LMX331HAXK+T require external hysteresis components?
No, the LMX331HAXK+T integrates 2mV of internal hysteresis, eliminating the need for external positive-feedback resistors. This simplifies design, reduces component count, and ensures consistent noise immunity across temperature and supply voltage - unlike standard comparators such as LMV331 that require external hysteresis networks.
What is the maximum sink current capability of the LMX331HAXK+T output?
The LMX331HAXK+T open-drain output can sink up to 10mA while maintaining ≤100mV saturation voltage at VDD = 5V and TA = +25°C. At –40°C to +125°C, the guaranteed sink current is 5mA with VSAT ≤ 700mV - sufficient to drive LEDs, MOSFET gates, or logic-level inputs directly.
Is the LMX331HAXK+T pin-compatible with the LMV331 series?
Yes, the LMX331HAXK+T is a drop-in, pin-for-pin replacement for the LMV331 in SC70-5 packaging. Both share identical pinout (IN+, VSS, IN−, OUT, VDD), footprint, and basic electrical interface - though LMX331HAXK+T adds internal hysteresis and extends performance across wider supply and temperature ranges.
Can the LMX331HAXK+T operate from a 1.8V supply?
Yes, the LMX331HAXK+T is fully functional at 1.8V supply, delivering 60ns propagation delay (tPLH), 40µA supply current, and 35mV output saturation voltage at 1mA sink load. Its guaranteed 1.8V–5.5V operation enables direct integration with modern ultra-low-voltage microcontrollers and energy-harvesting systems.
LMX331HAXK+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
LMX331HAXK+T FAQ
1.How can I place an order for LMX331HAXK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX331HAXK+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 LMX331HAXK+T reliable?
The price and inventory of LMX331HAXK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX331HAXK+T is usually 5 days.
3.What payment methods are accepted for LMX331HAXK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX331HAXK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX331HAXK+T?
LMX331HAXK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX331HAXK+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 LMX331HAXK+T?
For technical support, including LMX331HAXK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX331HAXK+T requirements.
6.How does Aetrix verify that LMX331HAXK+T is sourced from the original manufacturer or authorized distributors?
All LMX331HAXK+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 LMX331HAXK+T meets industry standards.
7.What is the process for return or replacement of LMX331HAXK+T?
All LMX331HAXK+T units undergo pre-shipment inspection (PSI). If there is an issue with LMX331HAXK+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 LMX331HAXK+T part is unused and in its original packaging.
Return procedure for LMX331HAXK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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