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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:3,372
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Product details
Overview
LMX331HAXK-T 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-T datasheet, LMX331HAXK-T pinout, LMX331HAXK-T application, or LMX331HAXK-T equivalent, this page provides verified electrical parameters, validated SC70 pin mapping, automotive-grade thermal performance data, hysteresis-enabled noise immunity analysis, and drop-in alternatives for low-voltage comparator selection.
Technical Context
The LMX331HAXK-T 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 band is fixed at 2mV and stable across temperature (-40°C to +125°C) and supply voltage (1.8V–5.5V), eliminating external feedback components for noise-prone inputs.
It uses submicron CMOS process technology to achieve low input bias current (±400nA max over full temperature range), low output saturation voltage (70mV at 4mA sink), and high PSRR (60–70dB). 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 interface with Li-ion battery, 3.3V, and 5V logic domains without level shifting. |
| Input Offset Voltage | 0.25–9 mV - Ensures accurate threshold detection down to ~10mV resolution in precision sensing applications. |
| Hysteresis | 2 mV - Provides built-in noise immunity for slow-moving signals (e.g., thermistor ramps, battery voltage monitoring). |
| Propagation Delay | 90 ns (tPHL, 100mV overdrive @ 5V) - Supports response to fast transients in power sequencing and fault detection. |
| Supply Current | 60 µA per comparator @ 5V - Enables multi-year operation in always-on battery-powered nodes (e.g., wake-up comparators). |
| Output Sink Current | 73 mA max @ 5V - Drives LEDs, MOSFET gates, or logic inputs directly without external buffers. |
| Operating Temperature | -40°C to +125°C - Qualified for under-hood automotive, industrial control, and extended-range portable use. |
Pinout & Package
LMX331HAXK-T 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/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - Accepts reference or signal voltage; supports common-mode down to -0.1V (below GND). |
| 2 | VSS | Negative supply - Must be connected to system ground; enables true ground-referenced input operation. |
| 3 | IN- | Inverting input - Compares against IN+; no phase reversal when overdriven beyond rails. |
| 4 | OUT | Open-drain output - Requires external pull-up; compatible with mixed-voltage logic (e.g., 1.8V logic driving 5V bus). |
| 5 | VDD | Positive supply - Powers internal circuitry; PSRR of 60–70dB rejects supply noise affecting trip point accuracy. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2mV hysteresis | Eliminates need for external positive-feedback resistors in noisy environments (e.g., motor control feedback, battery voltage sag detection). |
| Rail-to-rail input with ground-sensing | Allows direct monitoring of signals referenced to system ground (e.g., current-sense amplifier outputs, thermistor dividers). |
| Low 60µA supply current @ 5V | Reduces quiescent power in always-on subsystems - e.g., <15µW per comparator at 2.5V supply. |
| Open-drain output with 73mA sink capability | Supports direct drive of LEDs, small solenoids, or microcontroller interrupt lines without discrete FETs. |
| Guaranteed operation at 1.8V | Enables integration into ultra-low-power domains such as BLE SoC wake-up circuits and energy-harvesting sensors. |
Applications
| Battery Voltage Monitoring | Automotive Cabin Temperature Control |
|---|---|
Use Scenario: Detecting low-battery condition in portable medical devices before shutdown. IC Role / Device Role / Timing Role: Threshold comparator comparing battery voltage against 3.0V reference to assert low-VBAT flag. Use Value: Internal 2mV hysteresis prevents chatter during gradual voltage decay; 1.8V operation ensures functionality even during brown-out recovery. |
Use Scenario: Triggering HVAC fan activation when cabin temperature exceeds 28°C. IC Role / Device Role / Timing Role: Precision window comparator (with external resistors) detecting thermistor-based temperature crossing. Use Value: -40°C to +125°C rating guarantees reliability in parked-car thermal extremes; low input bias current avoids thermistor measurement error. |
| Power Sequencing in Industrial PLCs | USB-C Port Overvoltage Protection |
Use Scenario: Validating 12V auxiliary rail presence before enabling 3.3V FPGA core supply. IC Role / Device Role / Timing Role: Single-supply comparator asserting enable signal only when 12V rail reaches >11.4V. Use Value: 90ns propagation delay ensures tight timing margins in multi-rail sequencing; open-drain output interfaces cleanly with FPGA I/O banks. |
Use Scenario: Shutting down USB-C power delivery path if VBUS exceeds 21V during hot-plug events. IC Role / Device Role / Timing Role: Fast-response overvoltage detector feeding protection MOSFET gate driver. Use Value: 73mA sink current drives protection FET gate directly; 5.5V absolute max rating tolerates transient overshoots up to 6V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-voltage, hysteresis-equipped comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV3601DBVR | No internal hysteresis; requires external resistor network for noise immunity. Higher supply current (120µA). | Suitable where adjustable hysteresis is preferred; less optimal for fixed-threshold, space-constrained designs. | Select TLV3601DBVR only when programmable hysteresis or faster propagation (<30ns) is required despite added BOM cost and layout area. |
| MAX9021AXK+T | Includes internal 4mV hysteresis; higher offset voltage (max 8mV); same SC70-5 package and pinout. | Better noise margin for high-EMI environments; slightly reduced DC accuracy in precision thresholding. | Choose MAX9021AXK+T when stronger hysteresis is needed and ±8mV offset is acceptable - e.g., industrial sensor fault detection with long cables. |
Compared with LMX331HAXK-T, TLV3601DBVR offers speed at the cost of external components and higher quiescent power, while MAX9021AXK+T trades marginally higher hysteresis for relaxed offset tolerance - making LMX331HAXK-T optimal for cost-sensitive, space-limited automotive and portable applications requiring fixed 2mV noise immunity.
Availability
LMX331HAXK-T is available at Aetrix Electronics and suitable for battery-powered electronics, automotive subsystems, and general-purpose low-voltage applications 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, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The LMX331HAXK-T belongs to Maxim's LMX331/LMX393/LMX339 family - engineered specifically for low-voltage, high-reliability comparator functions in space- and power-constrained systems where noise immunity and wide temperature operation are critical.
FAQ
What is the guaranteed operating supply voltage range for LMX331HAXK-T?
The LMX331HAXK-T is fully specified and guaranteed to operate from 1.8V to 5.5V across the full -40°C to +125°C temperature range. At 1.8V, it maintains 2mV internal hysteresis, 5mV input offset voltage (typ), and 500ns propagation delay (tPLH) - enabling reliable function in ultra-low-power battery systems where LMX331HAXK-T must remain active during brown-out conditions.
Does LMX331HAXK-T include internal hysteresis, and how is it implemented?
Yes, LMX331HAXK-T integrates a fixed 2mV hysteresis band to prevent output oscillation on slow or noisy inputs. This hysteresis is implemented via internal feedback circuitry and is stable across temperature (-40°C to +125°C) and supply voltage (1.8V–5.5V), as confirmed in the Typical Operating Characteristics plots (Figures LMX331 toc10 and toc11). No external components are required to realize this feature in LMX331HAXK-T.
What is the maximum output sink current capability of LMX331HAXK-T?
The LMX331HAXK-T open-drain output supports up to 73mA sink current at VDD = 5.0V and TA = +25°C, with guaranteed minimum 10mA at VDD = 1.8V. This allows LMX331HAXK-T to directly drive LEDs, small relays, or microcontroller interrupt pins without additional buffering - reducing BOM count and board area in compact designs using LMX331HAXK-T.
Can LMX331HAXK-T accept input voltages below ground?
Yes, LMX331HAXK-T supports an input common-mode voltage range extending to -0.1V below VSS (ground), enabling true ground-referenced sensing. This capability is explicitly guaranteed in the Absolute Maximum Ratings and DC Electrical Characteristics tables, allowing LMX331HAXK-T to interface directly with current-sense amplifiers or transducer outputs that swing slightly negative relative to system ground.
Is LMX331HAXK-T pin-compatible with LMV331 variants?
Yes, LMX331HAXK-T is a drop-in, pin-for-pin replacement for LMV331 and LMV331H in the 5-pin SC70 package, as stated in the General Description. Both share identical pinout (IN+, VSS, IN-, OUT, VDD), supply voltage range, and open-drain output structure - enabling seamless migration to LMX331HAXK-T for improved hysteresis, wider temperature range, and lower offset without PCB redesign.
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.
LMX331HAXK-T Tags
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LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
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LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
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LM2901PWR
Texas Instruments
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LM2903DT
STMicroelectronics
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LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
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LM339APWR
Texas Instruments
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LM2903P
Texas Instruments
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LM393ADR
Texas Instruments
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NCX2200GMAZ
NXP USA Inc.
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