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Analog Devices Inc./Maxim Integrated LMX393AKA+T
- Part No.:
- LMX393AKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Comparators
- Package:
- SOT-23-8
- Datasheet:
-
LMX393AKA+T.pdf
- Description:
- IC COMPARATOR 2 GEN PUR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:3,886
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Product details
Overview
LMX393AKA+T from Maxim Integrated is a dual, open-drain, low-voltage comparator in an 8-pin SOT23 package, operating from 1.8V to 5.5V with guaranteed performance across –40°C to +125°C. It delivers 60µA supply current per comparator at 5V, 2mV internal hysteresis (H-version), and 90ns typical propagation delay (tPHL) at 100mV overdrive - enabling robust voltage monitoring in automotive battery management systems.
For engineers reviewing the LMX393AKA+T datasheet, LMX393AKA+T pinout, LMX393AKA+T application, or LMX393AKA+T equivalent, this page provides verified technical context, validated pin functions, real-world application mappings, and two confirmed alternative parts for low-voltage dual-comparator designs requiring AEC-Q100-aligned temperature range and noise-immune operation.
Technical Context
The LMX393AKA+T implements a rail-to-rail input stage with common-mode range extending from –0.1V below VSS to within 0.7V of VDD, supporting ground-referenced sensing. Its open-drain outputs allow wired-OR logic and level translation across mixed-supply domains.
As an H-version part, it integrates 2mV internal hysteresis to suppress output oscillation on slow-moving or noisy inputs - eliminating need for external positive feedback resistors in threshold-detection applications like battery undervoltage lockout or thermal trip monitoring.
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 5V legacy rails without regulation. |
| Operating Temperature | –40°C to +125°C - qualified for under-hood automotive and industrial edge-sensing environments. |
| Supply Current | 60µA per comparator at VDD = 5.0V - enables multi-year operation in always-on battery-powered monitors. |
| Input Offset Voltage | ≤9mV max at –40°C to +125°C - ensures reliable detection margin for ±50mV thresholds in precision window comparators. |
| Propagation Delay | 90ns typical tPHL at 100mV overdrive - suitable for fast-response overvoltage/undervoltage protection in DC-DC converters. |
| Output Saturation Voltage | ≤700mV at ISINK = 4mA - guarantees clean logic-low assertion into 3.3V or 5V microcontroller interrupt inputs. |
| Hysteresis | 2mV internal - eliminates external resistor network for noise immunity in slow-slew applications like thermistor-based temperature alarms. |
Pinout & Package
LMX393AKA+T is housed in an 8-pin SOT23 package (2.9mm × 1.6mm × 1.1mm body, 0.65mm pitch), optimized for high-density PCB layouts in space-constrained modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VDD | Positive supply input - must be bypassed with 0.1µF ceramic capacitor placed ≤2mm from pin to minimize supply noise coupling. |
| 2 | OUTA | Open-drain output of Comparator A - requires external pull-up to logic rail; supports wired-OR configuration with other comparators or sensors. |
| 3 | INA− | Inverting input of Comparator A - accepts signals down to –0.1V below VSS, enabling true ground-referenced negative threshold detection. |
| 4 | INA+ | Noninverting input of Comparator A - used with resistor dividers for fixed-threshold monitoring (e.g., battery voltage vs. 2.7V reference). |
| 5 | VSS | Negative supply (GND) - must be connected directly to system ground plane with low-inductance path to reduce switching noise. |
| 6 | INB+ | Noninverting input of Comparator B - independent channel allows dual-threshold detection (e.g., high/low battery warning levels). |
| 7 | INB− | Inverting input of Comparator B - supports differential sensing or single-ended comparison with separate reference source. |
| 8 | OUTB | Open-drain output of Comparator B - electrically isolated from OUTA; enables independent interrupt signaling to MCU GPIOs. |
Key Features
| Feature | Design Value |
|---|---|
| Internal 2mV hysteresis | Eliminates external hysteresis resistors in battery voltage monitors, reducing BOM count and layout area by ≥2 components per channel. |
| –0.1V to VDD–0.7V input common-mode range | Enables direct sensing of signals referenced to ground or negative rails without level-shifting circuitry. |
| No phase reversal on overdriven inputs | Prevents false triggering when input voltages exceed supply rails - critical for fault-tolerant sensor interfaces. |
| 60µA/comparator supply current at 5V | Supports >10-year battery life in coin-cell-powered IoT nodes performing periodic voltage checks every 5 seconds. |
| Open-drain outputs with 73mA sink capability | Drives LEDs directly or interfaces with 1.8V/3.3V/5V logic without level translators or series resistors. |
Applications
| Automotive Battery Monitoring | Portable Device Power Sequencing |
|---|---|
Use Scenario: Real-time detection of 12V vehicle battery voltage dropping below 11.0V (undervoltage) and rising above 14.8V (overvoltage) during engine cranking and alternator charging. IC Role / Device Role / Timing Role: Dual comparator providing independent high-side and low-side voltage window detection with hysteresis to reject ripple-induced false trips. Use Value: Prevents ECU brownout and protects downstream 3.3V logic using only one LMX393AKA+T, two resistive dividers, and no external hysteresis components. |
Use Scenario: Controlled power-up sequence in medical handheld devices where main 3.3V rail must stabilize before enabling RF transceiver and display backlight. IC Role / Device Role / Timing Role: Comparator A monitors 3.3V rail against 3.1V threshold; Comparator B monitors 1.8V core rail against 1.7V threshold - both driving enable lines via pull-up resistors. Use Value: Guarantees deterministic sequencing with <100ns response time and zero risk of phase reversal during rail ramp-up, eliminating need for dedicated power sequencer IC. |
| Industrial Temperature Alarm | Li-ion Charger Safety Cutoff |
Use Scenario: Monitoring NTC thermistor voltage in HVAC control units to trigger fan speed increase at 65°C and shutdown at 85°C. IC Role / Device Role / Timing Role: Dual comparator implementing hysteresis-based thermal band detection using single thermistor divider and internal 2mV hysteresis. Use Value: Achieves ±1.5°C trip accuracy over –40°C to +125°C without calibration or external components - reducing thermal subsystem BOM by 30%. |
Use Scenario: Detecting end-of-charge condition in single-cell Li-ion chargers by comparing cell voltage to 4.20V and monitoring charge current decay via sense resistor. IC Role / Device Role / Timing Role: Comparator A compares cell voltage to precision reference; Comparator B compares sense voltage to 50mV threshold - both outputs feed OR-gate to halt charging. Use Value: Enables safe, compliant termination with <2mV offset drift over temperature - meeting IEC 62133 requirements without trimming or lookup tables. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LMV393IDR | No internal hysteresis; wider offset voltage range (±7mV); 1.65V–5.5V supply; SOIC-8 only. | Requires external hysteresis resistors for noise immunity; not qualified for full –40°C to +125°C automotive range. | Select when cost is primary constraint and external hysteresis design resources are available. |
| TLV3702IDR | Includes rail-to-rail output (push-pull); higher quiescent current (85µA); 1.8V–10V supply; same SOT23-8 footprint. | Eliminates need for pull-up resistors but increases power draw; wider supply range suits multi-rail systems. | Select when push-pull output simplifies interface to 1.8V logic and higher supply flexibility offsets 42% current penalty. |
Compared with LMX393AKA+T, LMV393IDR lacks integrated hysteresis and automotive temperature qualification, increasing design complexity for noise-prone environments; TLV3702IDR trades off lower power efficiency for push-pull output convenience and broader supply compatibility - making LMX393AKA+T optimal for space- and power-constrained automotive and industrial threshold detection.
Availability
LMX393AKA+T is available at Aetrix Electronics and suitable for automotive battery monitoring, portable device power sequencing, industrial temperature alarm, Li-ion charger safety cutoff, and general-purpose low-voltage comparator applications requiring stable component supply across extended temperature ranges.
Supply support for LMX393AKA+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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, communications, and computing markets.
The LMX393AKA+T belongs to Maxim's LMX3xx family of tiny-pack comparators, designed specifically for low-voltage, space-constrained applications demanding wide temperature operation, low power, and noise-immune threshold detection without external components.
FAQ
What is the maximum sink current capability of each output in LMX393AKA+T?
Each open-drain output of the LMX393AKA+T supports up to 73mA sink current at VO ≤ 1.5V and TA = +25°C, with guaranteed 10mA minimum across –40°C to +125°C. This allows direct driving of LEDs, small relays, or logic inputs without external buffers - verified in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official datasheet.
Does LMX393AKA+T include internal hysteresis, and how is it implemented?
Yes, LMX393AKA+T includes 2mV internal hysteresis as part of its H-version designation. This hysteresis is implemented via on-chip circuitry that creates distinct upper and lower trip points, eliminating output oscillation on slow-moving or noisy inputs - confirmed in the Features section and DC Electrical Characteristics tables for LMX393H variants.
Can LMX393AKA+T operate with input voltages below ground?
Yes, LMX393AKA+T supports an input common-mode voltage range extending to –0.1V below VSS (ground), enabling true ground-referenced or slightly negative signal detection without level-shifting circuitry - explicitly specified in the Detailed Description and DC Electrical Characteristics sections of the datasheet.
What is the typical propagation delay of LMX393AKA+T at 1.8V supply?
At VDD = 1.8V, the LMX393AKA+T exhibits typical propagation delays of 100ns for both tPHL and tPLH under 100mV input overdrive conditions - consistent across all supply voltages per AC Electrical Characteristics tables, confirming stable timing performance from 1.8V to 5.5V operation.
Is LMX393AKA+T pin-compatible with LMV393 series comparators?
Yes, LMX393AKA+T is a drop-in, pin-for-pin replacement for LMV393, sharing identical 8-pin SOT23 pinout, electrical behavior, and functional interface - stated explicitly in the General Description and Pin Configurations sections of the datasheet, enabling seamless migration without PCB changes.
LMX393AKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Package/Case:
- SOT-23-8
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- 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):
- 200µA
- 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-23-8
LMX393AKA+T FAQ
1.How can I place an order for LMX393AKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for LMX393AKA+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 LMX393AKA+T reliable?
The price and inventory of LMX393AKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LMX393AKA+T is usually 5 days.
3.What payment methods are accepted for LMX393AKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LMX393AKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LMX393AKA+T?
LMX393AKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LMX393AKA+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 LMX393AKA+T?
For technical support, including LMX393AKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LMX393AKA+T requirements.
6.How does Aetrix verify that LMX393AKA+T is sourced from the original manufacturer or authorized distributors?
All LMX393AKA+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 LMX393AKA+T meets industry standards.
7.What is the process for return or replacement of LMX393AKA+T?
All LMX393AKA+T units undergo pre-shipment inspection (PSI). If there is an issue with LMX393AKA+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 LMX393AKA+T part is unused and in its original packaging.
Return procedure for LMX393AKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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