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Texas Instruments LM393APS
- Part No.:
- LM393APS
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- -
- Datasheet:
-
LM393APS.pdf
- Description:
- DUAL COMPARATOR
- Quantity:
- Payment:
- Shipping:
Inventory:5,920
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Product details
Overview
LM393APS from Texas Instruments is a dual open-collector differential voltage comparator designed for single-supply operation in industrial and consumer signal-conditioning circuits. It features 2 mV typical input offset voltage, 25 nA typical input bias current, and operates across 2 V to 36 V supply range - enabling use in battery-powered sensors and 24-V PLC I/O modules.
For engineers reviewing the LM393APS datasheet, LM393APS pinout, LM393APS application, or LM393APS equivalent, key selection criteria include its 0°C to 70°C temperature grade, PS package thermal profile (95°C/W θJA), open-collector output compatibility with TTL/MOS/CMOS, and guaranteed 2 mV max VIO at 25°C.
Technical Context
The LM393APS implements two independent comparators with rail-to-rail common-mode input range (including ground) and ±36 V differential input capability. Its internal architecture uses bipolar transistor stages with current-regulated active loads, delivering 1.3 µs typical response time under 5.1 kΩ pull-up and 15 pF load.
Each comparator output is open-collector, allowing wired-AND logic and level translation across voltage domains. Input stage design ensures low input bias current (25 nA typ) and stable operation without phase reversal, even when inputs exceed VCC by up to 0.3 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports direct interface with 3.3 V microcontrollers and 24 V industrial buses without level shifters. |
| Input Offset Voltage (max) | 2 mV at 25°C - enables accurate threshold detection in precision window comparators and zero-crossing detectors. |
| Input Bias Current (typ) | 25 nA - minimizes voltage error across high-impedance sensor sources like thermistors or photodiodes. |
| Output Type | Open-collector - permits flexible pull-up to any voltage ≤36 V and wired-AND logic for multi-sensor alarm aggregation. |
| Response Time (typ) | 1.3 µs - sufficient for monitoring fast transients in motor overcurrent protection and switching power supply feedback loops. |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded systems including HVAC controllers and office equipment. |
| Package Thermal Resistance | 95°C/W (θJA, PS package) - defines maximum power dissipation limit (≈680 mW at TA = 25°C) for thermal design. |
Pinout & Package
LM393APS is housed in a 8-pin Plastic Small Outline (PS) package with exposed pad (SOIC-8 variant), rated for surface-mount reflow per JEDEC J-STD-020. Pin 1 is marked by notch or dot; device orientation follows standard SOIC top-view convention.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - requires external pull-up; sinks up to 6 mA. |
| 2 | IN1– | Inverting input of Comparator 1 - accepts signals from 0 V to VCC–1.5 V. |
| 3 | IN1+ | Non-inverting input of Comparator 1 - same common-mode range as IN1–. |
| 4 | GND | Ground reference for both comparators and internal circuitry - must be low-impedance return path. |
| 5 | IN2+ | Non-inverting input of Comparator 2 - electrically isolated from Comparator 1 inputs. |
| 6 | IN2– | Inverting input of Comparator 2 - supports independent reference or signal comparison. |
| 7 | OUT2 | Open-collector output of Comparator 2 - independently controllable; shares no internal nodes with OUT1. |
| 8 | VCC | Positive supply pin - powers both comparators; no separate ground or negative supply required. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation | Eliminates need for split supplies in battery-powered or 24-V field devices - simplifies power architecture and reduces BOM count. |
| Input common-mode range includes ground | Enables direct sensing of 0 V referenced signals (e.g., current shunt monitors, thermocouple cold-junction compensation) without level-shifting circuitry. |
| ±36 V differential input capability | Allows safe comparison of signals exceeding VCC, such as AC line voltage zero-crossing detection or fault-voltage monitoring in industrial drives. |
| Low 0.4 mA supply current per comparator | Supports always-on monitoring in energy-sensitive applications like smart meter tamper detection and IoT edge node wake-up circuits. |
| TTL/MOS/CMOS output compatibility | Permits direct interfacing with legacy logic families and modern microcontrollers without additional buffering or level translation. |
Applications
| Overvoltage Protection Circuit | Temperature Threshold Detector |
|---|---|
|
Use Scenario: Monitoring DC bus voltage in a 24-V industrial power supply to trigger shutdown before capacitor overvoltage. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel compares against upper threshold, second against lower threshold. Use Value: LM393APS provides guaranteed 2 mV VIO and rail-to-rail input range, ensuring accurate trip points without calibration drift across 0°C–70°C ambient. |
Use Scenario: Detecting overheating in a motor driver PCB using an NTC thermistor in voltage-divider configuration. IC Role / Device Role / Timing Role: Single comparator comparing thermistor voltage against fixed reference - output drives fan control logic. Use Value: 25 nA input bias current prevents loading error in high-resistance thermistor networks, preserving accuracy of temperature setpoints. |
| Zero-Crossing Detector | Power Supply Sequencing Monitor |
|
Use Scenario: Generating clean digital timing edges from 50/60 Hz AC mains for TRIAC triggering in lighting dimmers. IC Role / Device Role / Timing Role: Comparator with hysteresis detecting AC waveform crossing through 0 V - output synchronized to line frequency. Use Value: Input common-mode range including ground allows direct connection to center-tapped transformer secondary without coupling capacitors or bias resistors. |
Use Scenario: Verifying correct startup order of multiple rails (e.g., 12 V, 5 V, 3.3 V) in FPGA-based systems before releasing reset. IC Role / Device Role / Timing Role: Three independent comparators (using two LM393APS devices) monitor each rail against precision references. Use Value: Open-collector outputs enable wired-AND of all "OK" signals into single system-ready flag - eliminating need for external logic gates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual open-collector comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393P | Same electrical specs but in plastic DIP-8 package (θJA = 85°C/W); wider operating temp (0°C–70°C) but no PS package footprint. | Preferred for through-hole prototyping or legacy board upgrades where SOIC rework is impractical. | Select LM393P only when manual assembly or socket-based testing is required; not suitable for automated SMT production. |
| LM2903PS | Extended temperature range (–40°C to 125°C); higher 7 mV max VIO; identical PS package and pinout. | Required for automotive engine control units or outdoor industrial gateways where ambient exceeds 70°C. | Choose LM2903PS when extended temperature qualification is mandatory; accept higher offset voltage tolerance for reliability under thermal stress. |
Compared with LM393P and LM2903PS, the LM393APS offers optimal balance of commercial-grade performance, SOIC-8 surface-mount compatibility, and tight 2 mV input offset - making it ideal for cost-sensitive, volume-manufactured consumer and industrial control boards where 0°C–70°C operation suffices.
Availability
LM393APS is available at Aetrix Electronics and suitable for industrial automation interfaces, consumer appliance control panels, and power supply monitoring circuits requiring stable component supply and consistent PS-package sourcing.
Supply support for LM393APS 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, specializing in analog and embedded processing technologies with broad industrial, automotive, and personal electronics reach.
The LM393 family was developed as a cost-optimized, general-purpose dual comparator platform targeting commercial-grade signal conditioning - emphasizing robustness, wide supply range, and ease of integration in non-automotive applications.
FAQ
What is the maximum supply voltage rating for LM393APS?
The LM393APS has an absolute maximum supply voltage (VCC) of 36 V. Operation beyond this risks permanent damage. Recommended continuous operation remains within 2 V to 36 V, with thermal limits defined by its PS package θJA of 95°C/W - meaning power dissipation must stay below ~680 mW at 25°C ambient to avoid exceeding junction temperature limits. LM393APS must never be operated above 36 V.
Does LM393APS support rail-to-rail input operation?
The LM393APS supports rail-to-rail common-mode input voltage range down to ground (0 V), but the upper limit is VCC – 1.5 V at 25°C and VCC – 2 V across full temperature range. However, differential input voltage can safely reach ±36 V - meaning either input may exceed VCC by up to 0.3 V without damage. This allows LM393APS to function reliably in AC-coupled or overvoltage-monitoring configurations where inputs swing beyond the supply rail.
Can LM393APS outputs be directly connected to a 5-V microcontroller GPIO?
Yes - the open-collector outputs of LM393APS can be pulled up to 5 V via an external resistor (e.g., 4.7 kΩ) and safely interface with 5-V tolerant microcontroller inputs. The output sink current capability is 6 mA minimum, well within typical GPIO sink ratings. No level-shifting circuitry is needed. Ensure the microcontroller input is configured as a digital input with internal pull-up disabled when using LM393APS with external pull-up.
What is the guaranteed input offset voltage specification for LM393APS?
The LM393APS is the A-grade version of the LM393 family, specified with a maximum input offset voltage (VIO) of 2 mV at 25°C and 4 mV across full operating temperature range (0°C to 70°C). This tighter specification distinguishes it from the standard LM393P (5 mV max at 25°C) and makes LM393APS suitable for applications demanding higher DC accuracy, such as precision voltage window detectors or calibrated sensor thresholds.
Is LM393APS pin-compatible with LM2903PS?
Yes - LM393APS and LM2903PS share identical PS package footprint, pin assignment, and mechanical dimensions. However, they differ electrically: LM2903PS is rated for –40°C to 125°C and has 7 mV max VIO, while LM393APS is 0°C to 70°C with 2 mV max VIO. Substitution is mechanically feasible but requires validation of temperature and offset requirements in the target application. LM393APS is not a drop-in replacement for automotive-qualified designs.
LM393APS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Type:
- -
- Number of Elements:
- -
- Output Type:
- -
- Voltage - Supply, Single/Dual (±):
- -
- :
- -
- Voltage - Input Offset (Max):
- -
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- -
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- :
- -
LM393APS FAQ
1.How can I place an order for LM393APS through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393APS 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 LM393APS reliable?
The price and inventory of LM393APS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393APS is usually 5 days.
3.What payment methods are accepted for LM393APS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393APS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393APS?
LM393APS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393APS 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 LM393APS?
For technical support, including LM393APS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393APS requirements.
6.How does Aetrix verify that LM393APS is sourced from the original manufacturer or authorized distributors?
All LM393APS 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 LM393APS meets industry standards.
7.What is the process for return or replacement of LM393APS?
All LM393APS units undergo pre-shipment inspection (PSI). If there is an issue with LM393APS, 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 LM393APS part is unused and in its original packaging.
Return procedure for LM393APS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM393APS Tags
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LM2903DT
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LM239DR
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