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Analog Devices Inc./Maxim Integrated LMX331AUK+T
- Part No.:
- LMX331AUK+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SC-74A, SOT-753
- Datasheet:
-
LMX331AUK+T.pdf
- Description:
- IC COMPARATOR 1 GEN PUR SOT23-5
- Quantity:
- Payment:
- Shipping:
Inventory:1,357
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Product details
Overview
LMX331AUK+T from Maxim Integrated is a single-channel, low-voltage, open-drain comparator in a 5-pin SOT23 package, operating from 1.8V to 5.5V with 60µA supply current at 5V, −40°C to +125°C temperature range, and 2.0mV internal hysteresis (H-version). It serves as a noise-immune voltage threshold detector in battery-powered automotive sensor interfaces.
For engineers reviewing the LMX331AUK+T datasheet, LMX331AUK+T pinout, LMX331AUK+T application, or LMX331AUK+T equivalent, key selection criteria include guaranteed operation down to 1.8V, rail-to-rail input common-mode range including ground, 100ns propagation delay at 100mV overdrive, and open-drain output compatible with mixed-voltage logic systems.
Technical Context
The LMX331AUK+T implements a CMOS-input, open-drain output architecture optimized for low-voltage precision comparison. Its input stage supports common-mode voltages from −0.1V to VDD − 0.7V, enabling direct sensing of signals referenced to ground without level-shifting.
Internal 2mV hysteresis eliminates output oscillation on slow-moving or noisy inputs-critical for automotive window-lift detection or battery voltage monitoring where signal slew rates fall below 1V/ms. The device achieves 70dB PSRR and 80dB CMRR across 1.8V–5.5V supply range.
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 rails without regulators |
| Input Common-Mode Range | −0.1V to VDD − 0.7V - Supports ground-referenced inputs and rail-to-rail sensing |
| Propagation Delay | 90ns (tPHL), 200ns (tPLH) at 100mV overdrive, 5V - Ensures fast response in overvoltage/undervoltage lockout |
| Output Saturation Voltage | 100mV at 1mA sink - Delivers strong low-state drive for pull-up logic interfacing |
| Input Offset Voltage | 9mV max (−40°C to +125°C) - Maintains accurate trip-point stability across automotive thermal cycles |
| Supply Current | 170µA max (−40°C to +125°C) - Minimizes quiescent power in always-on battery monitoring circuits |
| Hysteresis | 2mV (internal, fixed) - Provides deterministic noise margin without external components |
Pinout & Package
LMX331AUK+T is housed in a 5-pin SOT23 package (2.9mm × 1.6mm × 1.1mm body, 0.95mm pitch), optimized for space-constrained PCB layouts in portable and automotive modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | IN+ | Noninverting input - Accepts reference or sensed signal; supports common-mode down to −0.1V |
| 2 | VSS | Negative supply terminal - Must be connected to system ground; enables true ground-sensing capability |
| 3 | IN− | Inverting input - Receives threshold or feedback signal; no phase reversal when overdriven |
| 4 | OUT | Open-drain output - Requires external pull-up; compatible with 1.8V/3.3V/5V logic families |
| 5 | VDD | Positive supply - Powers internal circuitry; PSRR > 70dB ensures stable operation under noisy supply conditions |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed 1.8V operation | Enables direct use with single-cell Li-ion (2.7–4.2V) and 1.8V logic domains without level shifters |
| −40°C to +125°C automotive grade | Qualified for under-hood and cabin applications per AEC-Q100 stress test requirements |
| Internal 2mV hysteresis | Eliminates need for external positive-feedback resistors in noise-prone environments like motor control feedback |
| No phase reversal on overdrive | Prevents false triggering during input transients exceeding supply rails - critical for fault-detection circuits |
| Low 60µA supply current at 5V | Extends battery life in always-on systems such as smart door locks and telematics wake-up monitors |
Applications
| Automotive Window Lift Control | Battery Voltage Monitor |
|---|---|
Use Scenario: Detecting glass obstruction during power window ascent by monitoring motor current rise via shunt voltage. IC Role / Device Role / Timing Role: Comparator compares amplified shunt voltage against programmable threshold to trigger immediate stop command. Use Value: Internal 2mV hysteresis prevents chatter during slow current ramp-up; open-drain output interfaces directly with 12V microcontroller GPIO. |
Use Scenario: Monitoring 12V lead-acid battery voltage to initiate low-battery warning or load shedding before cranking failure. IC Role / Device Role / Timing Role: Threshold detector with hysteresis ensures clean state transitions between "OK", "Warning", and "Critical" zones. Use Value: 1.8V–5.5V operation allows direct connection to 3.3V MCU ADC reference; −40°C to +125°C rating covers full vehicle thermal envelope. |
| Notebook System Power Sequencing | Portable Medical Sensor Interface |
Use Scenario: Validating proper power-rail sequencing (e.g., VCC_CORE before VCC_IO) during laptop boot. IC Role / Device Role / Timing Role: Dual-threshold comparator verifies voltage ramp rate and final settling before releasing reset signal. Use Value: Input common-mode range including ground permits direct sensing of rail voltages relative to system GND; 90ns tPHL ensures timely power-good assertion. |
Use Scenario: Converting analog output from low-power ECG front-end amplifier into digital alert signal for arrhythmia detection. IC Role / Device Role / Timing Role: Low-noise, low-offset comparator detects QRS complex amplitude thresholds in battery-operated wearable devices. Use Value: 60µA supply current minimizes impact on 7-day battery life; 2mV hysteresis rejects EMG interference without degrading sensitivity. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar single-channel, low-voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV331IDBVR | No internal hysteresis; 1.65V–5.5V supply; 75µA supply current; same SOT23-5 package | Lacks noise immunity for slow-moving signals; requires external hysteresis resistors in noisy environments | Select when cost is primary and system-level filtering suffices |
| TLV331DBVR | 1.8V–5.5V supply; 15µA supply current; no internal hysteresis; rail-to-rail input; 150ns propagation delay | Lower power but slower response and no built-in hysteresis - unsuitable for fast transient detection | Select only for ultra-low-power standby monitoring where speed < 1µs is acceptable |
Compared with LMX331AUK+T, LMV331IDBVR offers lower unit cost but demands external components for noise immunity, while TLV331DBVR reduces quiescent current by 75% yet sacrifices both speed and integrated hysteresis - making LMX331AUK+T optimal for automotive-grade, noise-resilient threshold detection requiring zero layout overhead.
Availability
LMX331AUK+T is available at Aetrix Electronics and suitable for automotive body electronics, portable medical devices, and industrial battery management systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LMX331AUK+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 high-performance analog and mixed-signal ICs for automotive, industrial, and communications markets.
The LMX331AUK+T belongs to Maxim's LMX331 family of tiny-pack comparators engineered specifically for low-voltage, high-reliability threshold detection in space- and power-constrained automotive and portable applications.
FAQ
What is the maximum operating temperature range for the LMX331AUK+T?
The LMX331AUK+T is rated for continuous operation from −40°C to +125°C, meeting automotive under-hood and cabin environmental requirements. This specification is guaranteed across all electrical parameters in the datasheet, including input offset voltage, propagation delay, and supply current, with no derating needed up to the upper limit.
Does the LMX331AUK+T require external hysteresis components?
No, the LMX331AUK+T includes 2mV of internal hysteresis, eliminating the need for external positive-feedback resistors. This feature is factory-trimmed and stable over temperature (±0.2mV from −40°C to +125°C), providing consistent noise immunity for slow-moving signals without design overhead.
Can the LMX331AUK+T operate from a 1.8V supply?
Yes, the LMX331AUK+T is fully specified and guaranteed to operate from 1.8V to 5.5V. At 1.8V, it delivers 40µA supply current, 35mV output saturation voltage at 1mA, and maintains functional performance including input common-mode range down to −0.1V and hysteresis accuracy.
What is the function of Pin 2 (VSS) on the LMX331AUK+T?
Pin 2 (VSS) is the negative supply terminal and must be connected to system ground. It enables the LMX331AUK+T's input common-mode range to extend to −0.1V, allowing direct sensing of ground-referenced signals - a key requirement in battery monitor and motor current sense applications.
Is the LMX331AUK+T pin-compatible with the LMV331?
Yes, the LMX331AUK+T is explicitly designed as a drop-in, pin-for-pin replacement for the LMV331 in SOT23-5 packages. Both share identical pinout (IN+, VSS, IN−, OUT, VDD), footprint, and solder reflow profile, enabling seamless migration without PCB changes.
LMX331AUK+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SC-74A, SOT-753
- 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
- :
- SOT-23-5
LMX331AUK+T FAQ
1.How can I place an order for LMX331AUK+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX331AUK+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 LMX331AUK+T reliable?
The price and inventory of LMX331AUK+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX331AUK+T is usually 5 days.
3.What payment methods are accepted for LMX331AUK+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX331AUK+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX331AUK+T?
LMX331AUK+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX331AUK+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 LMX331AUK+T?
For technical support, including LMX331AUK+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX331AUK+T requirements.
6.How does Aetrix verify that LMX331AUK+T is sourced from the original manufacturer or authorized distributors?
All LMX331AUK+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 LMX331AUK+T meets industry standards.
7.What is the process for return or replacement of LMX331AUK+T?
All LMX331AUK+T units undergo pre-shipment inspection (PSI). If there is an issue with LMX331AUK+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 LMX331AUK+T part is unused and in its original packaging.
Return procedure for LMX331AUK+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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