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Texas Instruments LM393PS
- Part No.:
- LM393PS
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
LM393PS.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,487
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Product details
Overview
LM393PS from Texas Instruments is a dual voltage comparator IC designed for single-supply operation across 2 V to 36 V, featuring ±4 mV max input offset voltage, 1.3 µs typical response time, 200 µA per comparator quiescent current, and rail-to-rail input capability including ground - widely used in power supply monitoring, motor control feedback, and industrial sensor interface circuits.
For engineers reviewing the LM393PS datasheet, LM393PS pinout, LM393PS application, or LM393PS equivalent, this page delivers verified electrical specs, SOIC-8 package details, real-world use cases in server PSUs and cordless tools, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM393PS belongs to the legacy LM393 family (non-B version), operating as two independent open-collector comparators with common-mode input range extending to ground and differential input tolerance up to ±36 V. It uses bipolar input stages and relies on external pull-up resistors for output logic level translation.
Its propagation delay is optimized for medium-speed decision-making (e.g., overvoltage latch, battery charge state detection), with stable performance across 0°C to 70°C ambient temperature and no internal hysteresis - requiring external hysteresis networks for noise-immune thresholding in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - supports wide-input industrial and automotive auxiliary rails without regulation |
| Input Offset Voltage (max) | ±4 mV at 25°C - enables accurate threshold detection within ~0.1% of full-scale reference |
| Response Time (typ) | 1.3 µs - sufficient for 500 kHz–1 MHz window-compare loops in SMPS feedback |
| Quiescent Current | 0.8 mA total (400 µA/comparator) - low enough for always-on monitoring in battery-backed systems |
| Output Type | Open-collector - allows wired-OR logic, level-shifting, and direct interface to TTL/CMOS/MOS loads |
| Common-Mode Input Range | 0 V to (VCC − 2 V) - accepts ground-referenced sensors and high-side current sense signals |
Pinout & Package
LM393PS is supplied in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with standard gull-wing leads, surface-mount compatible, and RoHS compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector drain - requires external pull-up to define logic HIGH level and sink current when active |
| 1IN− | Comparator 1 inverting input | Differential input node - connects to reference or feedback signal in threshold comparison |
| 1IN+ | Comparator 1 non-inverting input | Differential input node - typically tied to sensor output or adjustable divider for trip point |
| GND | Ground reference | Common return path for inputs, outputs, and supply - must be low-impedance for noise immunity |
| 2IN+ | Comparator 2 non-inverting input | Independent threshold input - enables dual-window or redundant fault detection |
| 2IN− | Comparator 2 inverting input | Independent reference input - supports differential sensing or inverted logic configuration |
| 2OUT | Comparator 2 output | Open-collector drain - electrically isolated from 1OUT; supports separate pull-up voltages |
| VCC | Positive supply | Single power rail - powers both comparators; no negative supply required |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input range | Enables direct interface to 0 V–referenced thermistors, shunt amplifiers, and battery terminals |
| Open-collector outputs | Permits flexible logic-level translation (e.g., 3.3 V MCU detecting 24 V system faults) |
| No internal hysteresis | Allows precise, user-defined hysteresis via external resistor network - avoids false triggering |
| Wide supply range (2–30 V) | Eliminates need for local LDO in multi-rail systems - simplifies BOM and layout |
| Industry-standard pinout | Ensures drop-in replacement for LM293, LM393A, and other legacy variants in existing designs |
Applications
| Server Power Supply Monitoring | Cordless Power Tool Battery Management |
|---|---|
|
Use Scenario: Real-time detection of overvoltage, undervoltage, and overtemperature conditions in 12 V/48 V server PSU rails. IC Role / Device Role / Timing Role: Dual comparator performs independent high/low threshold checking on each monitored rail, latching faults via external SR latch. Use Value: Enables fast (<2 µs) fault response without microcontroller intervention, improving system reliability under transient stress. |
Use Scenario: Monitoring cell voltage balance and pack temperature during charging/discharging cycles in 18 V–60 V Li-ion tool packs. IC Role / Device Role / Timing Role: One comparator compares cell voltage to upper/lower thresholds; second monitors thermistor voltage against thermal cutoff limits. Use Value: Provides hardware-level safety cutoff before firmware-level protection activates - critical for UL/IEC compliance. |
| Single-Phase UPS Voltage Regulation | Industrial Motor Drive Enable Logic |
|
Use Scenario: Validating AC input presence, battery voltage readiness, and inverter output stability in line-interactive UPS units. IC Role / Device Role / Timing Role: LM393PS compares rectified AC zero-crossing signal and battery voltage against precision references to gate inverter enable. Use Value: Ensures clean switchover between utility and battery modes with <10 µs decision latency - prevents output dropout. |
Use Scenario: Interlocking motor start commands with DC bus voltage validation and thermal shutdown signals in BLDC drives. IC Role / Device Role / Timing Role: Comparator pair validates minimum DC link voltage and heatsink thermistor output before enabling gate driver PWM inputs. Use Value: Prevents MOSFET shoot-through and thermal runaway by enforcing hard-wired preconditions prior to MCU command execution. |
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 |
|---|---|---|---|
| LM393DR | Same SOIC-8 package, identical electrical specs, but rated for 0°C to 70°C (same temp grade as LM393PS) | No difference - fully interchangeable in commercial-grade designs with same footprint and thermal profile | Select LM393DR if sourcing from Digi-Key/Mouser preferred channels; LM393PS is TI's legacy part number with identical function |
| LM2903PSR | Wider temp range (−40°C to 125°C), higher max supply (32 V), but 15 mV max offset and 1.3 µs delay - same pinout | Better suited for automotive under-hood or industrial ambient environments where extended temperature operation is required | Choose LM2903PSR only when operating beyond 70°C ambient; otherwise LM393PS offers tighter offset and lower cost for commercial use |
Compared with LM393DR, LM393PS shares identical timing, offset, and package - differing only in TI's internal orderable suffix; versus LM2903PSR, LM393PS trades extended temperature and voltage margin for superior offset accuracy and lower unit cost in non-automotive applications.
Availability
LM393PS is available at Aetrix Electronics and suitable for server PSU monitoring, cordless power tool battery management, and single-phase UPS voltage regulation requiring stable component supply across long-life industrial programs.
Supply support for LM393PS 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 leader specializing in analog and embedded processing technologies, with over 90 years of innovation in precision analog ICs and power management solutions.
The LM393PS belongs to TI's foundational voltage comparator product line, engineered for robustness, ease of use, and broad compatibility in power supervision, sensor interfacing, and industrial control applications.
FAQ
What is the maximum supply voltage rating for LM393PS?
The LM393PS has an absolute maximum supply voltage of 36 V, but its recommended operating range is 2 V to 30 V per the datasheet's Recommended Operating Conditions table. Exceeding 30 V may degrade long-term reliability or shift input offset voltage beyond spec - always verify derating margins for continuous operation in your design. LM393PS remains functional up to 36 V for short transients.
Does LM393PS include internal hysteresis?
No, LM393PS does not include internal hysteresis. Its comparator stages are hysteresis-free, requiring external positive feedback (e.g., resistor from output to non-inverting input) to prevent oscillation near threshold crossings. This design gives full control over hysteresis width - critical for noise-prone sensor inputs. LM393PS behavior is deterministic only when hysteresis is externally implemented.
Can LM393PS drive a 5 V logic input directly?
LM393PS cannot drive a 5 V logic input directly because its output is open-collector and requires an external pull-up resistor to establish the HIGH voltage level. To interface with 5 V CMOS/TTL, connect a pull-up resistor (e.g., 4.7 kΩ) from 1OUT or 2OUT to a 5 V rail. The LM393PS itself sinks current when active but does not source - so logic HIGH is defined solely by the external pull-up.
What is the input common-mode voltage range of LM393PS?
The LM393PS supports a common-mode input range from 0 V (ground) up to (VCC − 2 V) at 25°C, and down to −0.3 V minimum (with current limiting). This allows direct connection of grounded sensors (e.g., NTC thermistors, current shunts) and high-side signals up to 28 V on a 30 V rail. Both inputs may exceed the common-mode range individually - only one needs to stay within bounds for valid comparison.
Is LM393PS pin-compatible with LM293 or LM393A?
Yes, LM393PS is pin-compatible with LM293 and LM393A in SOIC-8 packaging. All three share identical pin functions (1OUT, 1IN−, 1IN+, GND, 2IN+, 2IN−, 2OUT, VCC), same footprint, and mechanical dimensions. Electrical differences exist - LM393PS and LM393A specify ±4 mV max offset, while LM293 specifies ±9 mV - but PCB layout and soldering processes require no changes for substitution.
LM393PS Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.209", 5.30mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 5mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SO
LM393PS FAQ
1.How can I place an order for LM393PS through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393PS 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 LM393PS reliable?
The price and inventory of LM393PS are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393PS is usually 5 days.
3.What payment methods are accepted for LM393PS?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393PS transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393PS?
LM393PS orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393PS 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 LM393PS?
For technical support, including LM393PS datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393PS requirements.
6.How does Aetrix verify that LM393PS is sourced from the original manufacturer or authorized distributors?
All LM393PS 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 LM393PS meets industry standards.
7.What is the process for return or replacement of LM393PS?
All LM393PS units undergo pre-shipment inspection (PSI). If there is an issue with LM393PS, 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 LM393PS part is unused and in its original packaging.
Return procedure for LM393PS:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM393PS Tags
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