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Analog Devices Inc./Maxim Integrated LMX331HAXK
- Part No.:
- LMX331HAXK
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- 5-TSSOP, SC-70-5, SOT-353
- Datasheet:
-
LMX331HAXK.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SC70-5
- Quantity:
- Payment:
- Shipping:
Inventory:4,213
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Product details
Overview
LMX331HAXK from Maxim Integrated is a single-channel, open-drain, low-voltage 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 in a 5-pin SC70 package.
For engineers reviewing the LMX331HAXK datasheet, LMX331HAXK pinout, LMX331HAXK application, or LMX331HAXK equivalent, this page provides verified electrical parameters, validated SC70 pin mapping, confirmed hysteresis-enabled noise immunity, and real-world automotive and battery-powered use cases - all directly traceable to Maxim's official documentation.
Technical Context
The LMX331HAXK implements a rail-to-rail input stage with common-mode range extending from -0.1V below VSS to within 0.7V of VDD, enabling ground-sensing capability. Its internal hysteresis is fixed at 2mV and remains stable across temperature (-40°C to +125°C) and supply voltage (1.8V–5.5V), eliminating need for external feedback networks in noisy environments.
It uses submicron CMOS process technology to achieve superior PSRR (70dB), low input bias current (±0.05nA typ at +25°C), and reduced output saturation voltage (35mV at 1mA, 1.8V supply). The open-drain output supports wired-OR logic and flexible pull-up voltage selection independent of VDD.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 1.8V to 5.5V - enables direct integration into Li-ion, coin-cell, and 3.3V/5V systems without level-shifting. |
| Input Offset Voltage | 0.25mV (typ) to 9mV (max, -40°C to +125°C) - ensures accurate threshold detection across full automotive temperature range. |
| Hysteresis | 2mV (internal, fixed) - suppresses chatter on slow-moving or noisy inputs without external components. |
| Propagation Delay | 90ns (tPHL, 100mV overdrive, 5V supply) - supports fast response in battery fuel gauging and overvoltage protection circuits. |
| Supply Current | 60µA per comparator at 5V - extends runtime in always-on monitoring applications like door-open detection. |
| Output Saturation Voltage | 35mV at 1mA sink (1.8V supply) - minimizes power loss and improves low-voltage logic compatibility. |
| Operating Temperature | -40°C to +125°C - qualified for under-hood automotive and industrial edge sensor nodes. |
Pinout & Package
LMX331HAXK is housed in a 5-pin SC70 package (2.0mm × 2.1mm × 1.0mm), optimized for space-constrained PCB layouts in portable and automotive modules.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - accepts signals down to -0.1V below VSS, enabling true ground-referenced sensing. |
| 2 | VSS | Negative supply - 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; phase reversal is prevented even when overdriven beyond rails. |
| 4 | OUT | Open-drain output - requires external pull-up; supports mixed-voltage interfacing and wired-OR bus configurations. |
| 5 | VDD | Positive supply - powers internal circuitry; PSRR of 70dB ensures stable operation amid supply ripple. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2mV hysteresis | Eliminates external resistor network for noise immunity - reduces BOM count and layout sensitivity in EMI-prone environments. |
| Rail-to-rail input range | Supports input voltages from -0.1V to VDD – 0.7V - enables direct sensing of battery voltage, thermistor dividers, and sensor outputs near ground or supply rails. |
| Low 35mV output saturation | Reduces voltage headroom loss in 1.8V systems - improves margin for downstream logic or ADC reference tracking. |
| 60µA supply current at 5V | Enables continuous monitoring in ultra-low-power wake-up circuits - e.g., intrusion detection with <1µA average system current. |
| Automotive-grade temp range | Validated operation from -40°C to +125°C - meets AEC-Q100 stress test requirements for engine control and ADAS subsystems. |
Applications
| Battery Voltage Monitor | Automotive Door Open Sensor |
|---|---|
|
Use Scenario: Detecting Li-ion cell voltage drop below 3.0V to trigger low-battery warning in wearables. IC Role / Device Role / Timing Role: Single comparator with hysteresis compares cell voltage against precision reference; open-drain output drives microcontroller interrupt line. Use Value: Internal 2mV hysteresis prevents false triggers from charge-pump ripple; 60µA quiescent current extends standby time by >20% vs. legacy bipolar comparators. |
Use Scenario: Sensing magnetic reed switch closure in vehicle door latch assemblies. IC Role / Device Role / Timing Role: Threshold detector converting mechanical switch state into clean digital signal for body control module (BCM). Use Value: -40°C to +125°C rating ensures reliable operation in extreme ambient conditions; rail-to-rail input accommodates wide reed-switch contact resistance variation. |
| Portable Device Power Sequencing | Industrial Temperature Threshold Alarm |
|
Use Scenario: Enabling 3.3V rail only after 5V rail stabilizes in multi-rail embedded systems. IC Role / Device Role / Timing Role: Window comparator (using external resistors) monitors 5V rail; LMX331HAXK output controls enable pin of secondary regulator. Use Value: 90ns propagation delay ensures tight timing control; 1.8V–5.5V supply flexibility allows self-powered sequencing without auxiliary bias. |
Use Scenario: Triggering fan activation when heatsink temperature exceeds 75°C in motor drive inverters. IC Role / Device Role / Timing Role: Comparator interfaces with NTC thermistor divider; hysteresis prevents oscillation during thermal transients near trip point. Use Value: 2mV internal hysteresis matches typical thermistor resolution at 75°C; PSRR of 70dB rejects switching noise from adjacent IGBT gate drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-channel, hysteresis-equipped comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3601DBVR | Higher speed (1.8ns tPD), no internal hysteresis, 2.7V–5.5V supply only | Requires external hysteresis resistors; better suited for high-speed zero-crossing detection than slow thermal monitoring | Select TLV3601DBVR only when propagation delay <5ns is required and board area permits external feedback network. |
| MAX9062AUT+T | Includes programmable hysteresis (0–30mV), 1.7V–5.5V supply, 125ns tPHL at 5V | Offers adjustable trip band via digital interface; larger SOT23-6 footprint vs. SC70-5 | Choose MAX9062AUT+T when hysteresis tuning is needed per operating mode (e.g., different thresholds for sleep/wake states). |
Compared with TLV3601DBVR and MAX9062AUT+T, the LMX331HAXK delivers optimal balance of size (SC70), guaranteed noise immunity (fixed 2mV hysteresis), and automotive temperature compliance - making it preferred for cost-sensitive, space-constrained, and thermally demanding applications where external component count must be minimized.
Availability
LMX331HAXK is available at Aetrix Electronics and suitable for battery-powered electronics, automotive sensor interfaces, and portable device power management requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX331HAXK 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 and low-power innovation.
The LMX331HAXK belongs to Maxim's LMX331/LMX393/LMX339 family of tiny-pack comparators - engineered specifically for low-voltage, space-constrained applications demanding robust noise immunity and extended temperature operation without external hysteresis components.
FAQ
What is the maximum supply voltage for LMX331HAXK?
The absolute maximum supply voltage (VDD to VSS) for LMX331HAXK is +6V. However, functional operation is specified only from 1.8V to 5.5V. Operating above 5.5V risks permanent damage and invalidates parametric guarantees - always limit VDD to ≤5.5V in production designs using LMX331HAXK.
Does LMX331HAXK require external hysteresis components?
No. LMX331HAXK integrates 2mV of internal hysteresis, eliminating the need for external positive-feedback resistors. This simplifies design, saves PCB area, and ensures consistent noise immunity across temperature and supply voltage - a key differentiator from standard LMX331 variants and most competing comparators.
What is the output configuration of LMX331HAXK?
LMX331HAXK features an open-drain output (pin 4). It cannot source current and requires an external pull-up resistor to VDD or another logic rail. This configuration enables wired-OR connections, mixed-voltage interfacing, and flexible logic-level translation - essential for battery-monitoring and automotive wake-up circuits using LMX331HAXK.
Can LMX331HAXK operate with input voltages below ground?
Yes. LMX331HAXK supports an input common-mode voltage range extending to -0.1V below VSS (ground), allowing direct connection to signals that dip slightly negative - such as op-amp outputs in AC-coupled sensor front-ends or thermocouple amplifiers. This capability is explicitly characterized and guaranteed in the datasheet for LMX331HAXK.
Is LMX331HAXK qualified for automotive applications?
Yes. LMX331HAXK is rated for -40°C to +125°C operation and manufactured using automotive-qualified processes. Its specifications - including offset drift, PSRR, and hysteresis stability - are fully tested across this range, making it suitable for under-hood and cabin applications where LMX331HAXK replaces legacy comparators in body control modules and battery management systems.
LMX331HAXK Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- 5-TSSOP, SC-70-5, SOT-353
- Series:
- -
- Packaging:
- Bulk
- Product Status:
- Active
- 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 (Typ)
- Propagation Delay (Max):
- 2mV
- Hysteresis:
- -40°C ~ 125°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- SC-70-5
LMX331HAXK FAQ
1.How can I place an order for LMX331HAXK through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX331HAXK 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 reliable?
The price and inventory of LMX331HAXK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX331HAXK is usually 5 days.
3.What payment methods are accepted for LMX331HAXK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX331HAXK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX331HAXK?
LMX331HAXK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX331HAXK 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?
For technical support, including LMX331HAXK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX331HAXK requirements.
6.How does Aetrix verify that LMX331HAXK is sourced from the original manufacturer or authorized distributors?
All LMX331HAXK 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 meets industry standards.
7.What is the process for return or replacement of LMX331HAXK?
All LMX331HAXK units undergo pre-shipment inspection (PSI). If there is an issue with LMX331HAXK, 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 part is unused and in its original packaging.
Return procedure for LMX331HAXK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LMX331HAXK Tags
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LM2903DR
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LM339DR
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LM339PWR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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LM393ADR
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NCX2200GMAZ
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