My Inquiry
My Account
Texas Instruments LM393N/NOPB
- Part No.:
- LM393N/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM393N/NOPB.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:5,421
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM393N/NOPB from Texas Instruments is a dual, low-power, precision voltage comparator IC with open-collector outputs, designed for single-supply operation from 2.0 V to 36 V or dual supplies (±1.0 V to ±18 V). It features ±3 mV maximum input offset voltage, 0.4 mA supply current at 5 V, 25 nA input bias current, and input common-mode range extending to ground - enabling direct sensing of signals near 0 V in battery-powered and industrial monitoring systems.
For engineers reviewing the LM393N/NOPB datasheet, LM393N/NOPB pinout, LM393N/NOPB application, or LM393N/NOPB equivalent, key selection considerations include its rail-to-rail input capability down to ground, TTL/CMOS-compatible open-collector output stage, low quiescent current for energy-constrained designs, and guaranteed performance across 0°C to +70°C ambient temperature.
Technical Context
The LM393N/NOPB integrates two independent PNP-input comparators sharing a common ground and positive supply. Its input stage allows common-mode voltages from 0 V up to (V+ − 1.5 V), supporting ground-referenced signal detection without level-shifting. Each output is an open-collector NPN transistor capable of sinking up to 16 mA, compatible with logic families including TTL, CMOS, and ECL.
Supply current remains stable at 0.4 mA (typ.) over 5 V to 36 V operation, and input bias current stays constant at 25 nA (typ.), minimizing loading on high-impedance sensor nodes. The device exhibits 300 ns large-signal response time under TTL-level transitions with 5 mV overdrive, and output saturation voltage is specified at 250 mV (max) at 4 mA sink current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 36 V single supply; enables direct use with 3.3 V, 5 V, 12 V, and 24 V systems without regulation |
| Input Offset Voltage | ±3 mV max; ensures accurate threshold detection in precision level-sensing applications |
| Supply Current | 0.4 mA typ. at 5 V; supports long-life battery operation in portable instrumentation and IoT edge sensors |
| Input Bias Current | 25 nA typ.; permits direct interfacing with high-impedance sources like thermistors and photodiodes |
| Output Configuration | Open-collector NPN per channel; allows wired-OR logic, flexible pull-up to any compatible voltage rail, and interface with mixed-voltage logic |
| Input Common-Mode Range | Includes ground (0 V) up to (V+ − 1.5 V); eliminates need for negative supply or input biasing in single-supply zero-crossing or battery-monitoring circuits |
| Output Sink Current | 6.0 mA min / 16 mA max; sufficient to drive LEDs, small relays, or logic inputs directly without external buffers |
Pinout & Package
LM393N/NOPB is housed in an 8-pin SOIC (Small Outline Integrated Circuit) package measuring 4.90 mm × 3.91 mm, with standard 1.27 mm pitch and surface-mount footprint. The package is RoHS-compliant and lead-free (NOPB suffix).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA (Pin 1) | Output, Channel A | Open-collector NPN output; requires external pull-up resistor to define HIGH state logic level |
| –INA (Pin 2) | Inverting Input, Channel A | Reference input node; used for threshold comparison when non-inverting input carries sensed signal |
| +INA (Pin 3) | Non-inverting Input, Channel A | Sensed signal input; accepts voltages from 0 V to (V+ − 1.5 V) with no level-shifting required |
| GND (Pin 4) | Ground Reference | Common return path for both comparators and internal bias network; serves as reference for single-supply operation |
| +INB (Pin 5) | Non-inverting Input, Channel B | Second independent signal input; identical electrical characteristics to +INA |
| –INB (Pin 6) | Inverting Input, Channel B | Second independent reference input; supports dual-threshold or window-comparator configurations |
| OUTB (Pin 7) | Output, Channel B | Independent open-collector output; electrically isolated from OUTA for separate load control |
| V+ (Pin 8) | Positive Supply | Single power rail input; powers both comparators and supports wide-range operation without regulation |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation from 2.0 V | Enables use in coin-cell and Li-ion powered devices without auxiliary voltage rails or charge pumps |
| Input common-mode range includes ground | Permits direct comparison of 0–VREF signals (e.g., battery voltage vs. 2.5 V threshold) without input biasing networks |
| 0.4 mA supply current (typ.) | Reduces system-level power budget impact in always-on monitoring circuits such as smoke detectors or asset trackers |
| 25 nA input bias current (typ.) | Minimizes error in high-impedance sensor interfaces - e.g., pH electrodes, RTDs with 10 kΩ+ sense resistors |
| Open-collector outputs with 16 mA sink capability | Supports direct LED driving, relay coil activation, and logic-level translation across 1.8 V to 15 V domains |
Applications
| Battery Voltage Monitor | Industrial Threshold Detector |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger low-battery warning or cutoff at 3.0 V and overvoltage protection at 4.25 V. IC Role / Device Role / Timing Role: Dual comparator configured as window detector; each channel compares cell voltage against independent reference thresholds. Use Value: Eliminates need for ADC and microcontroller polling; provides deterministic, low-latency response with <1.5 μs propagation delay and no software overhead. |
Use Scenario: Detecting out-of-tolerance pressure transducer output in HVAC control panels operating from 24 V DC supply. IC Role / Device Role / Timing Role: Single-channel comparator comparing amplified sensor output to fixed 2.0 V trip point; output drives optocoupler-isolated alarm circuit. Use Value: Ground-referenced input allows direct connection to ratiometric bridge sensors; 0.4 mA quiescent current minimizes heat rise in sealed enclosures. |
| Zero-Crossing Detector | Logic-Level Translator |
|
Use Scenario: Converting AC mains waveform (via resistive divider) into clean digital square wave for phase-controlled dimmer timing in smart lighting systems. IC Role / Device Role / Timing Role: One comparator channel biased at 0 V reference (GND), detecting polarity transitions of attenuated AC signal. Use Value: Input common-mode range including ground enables true zero-reference detection without virtual ground circuitry or dual supplies. |
Use Scenario: Interfacing 5 V microcontroller GPIO to 3.3 V I²C bus by converting SDA/SCL logic levels while preserving signal integrity. IC Role / Device Role / Timing Role: Dual comparator used as bidirectional level shifter; open-collector outputs pulled to 3.3 V with appropriate hysteresis. Use Value: Output compatibility with TTL/CMOS logic and flexible pull-up voltage selection allow robust, low-jitter translation without dedicated level-shift ICs. |
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 electrical specs; SOIC-8 package with tape-and-reel packaging and slightly tighter AEC-Q200 qualification scope | Preferred for automated SMT production due to reel packaging; identical pinout and thermal profile | Select LM393DR for high-volume manufacturing where reel delivery and extended reliability screening are required |
| TLV3702IDR | Rail-to-rail input, 1.8 V min supply, 85 μA supply current; CMOS output (push-pull), not open-collector | Required when ultra-low power (<100 μA) or sub-2 V operation is needed; incompatible with wired-OR or mixed-voltage pull-ups | Choose TLV3702IDR only if supply voltage is <2.0 V or push-pull output functionality is mandatory; not drop-in compatible |
Compared with LM393DR, LM393N/NOPB offers identical core functionality in tube packaging suitable for prototyping and low-volume builds; versus TLV3702IDR, it trades higher quiescent current for open-collector flexibility, wider supply range, and proven robustness in industrial voltage-monitoring roles.
Availability
LM393N/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial process monitors, and consumer appliance control systems requiring stable component supply across multi-year production cycles.
Supply support for LM393N/NOPB 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 delivering analog and embedded processing solutions, with over 90 years of innovation in precision analog ICs and broad industrial portfolio coverage.
The LM393N/NOPB belongs to TI's legacy precision comparator family, engineered for cost-sensitive, high-reliability applications where ground-sensing capability, wide supply range, and logic-compatible outputs are essential - especially in power management and sensor interface subsystems.
FAQ
What is the operating temperature range for LM393N/NOPB?
The LM393N/NOPB is rated for operation from 0°C to +70°C ambient temperature. This commercial-grade specification aligns with its intended use in consumer electronics, industrial controls, and general-purpose embedded systems - distinct from the extended ranges of LM2903 (−40°C to +85°C) or LM193 (−55°C to +125°C). Always verify thermal derating in high-power-density PCB layouts.
Can LM393N/NOPB be used with a single 3.3 V supply?
Yes, LM393N/NOPB operates reliably from 2.0 V to 36 V single supply, making it fully compatible with 3.3 V systems. At 3.3 V, its input common-mode range extends from 0 V to 1.8 V, and output saturation voltage remains ≤400 mV at 4 mA sink - ensuring clean logic-level transitions when paired with 3.3 V pull-up resistors.
Does LM393N/NOPB require external pull-up resistors on its outputs?
Yes, LM393N/NOPB features open-collector outputs that must be pulled up externally to define the HIGH logic state. Pull-up voltage may differ from V+ (e.g., 1.8 V or 5 V) and must remain within the device's absolute maximum ratings. Typical values range from 4.7 kΩ to 10 kΩ depending on speed and load requirements.
How does the input bias current of LM393N/NOPB affect high-impedance sensor interfaces?
With a typical input bias current of 25 nA, LM393N/NOPB introduces minimal error in high-Z sensor paths - for example, adding only ~250 µV offset across a 10 kΩ source impedance. This enables direct connection to thermistors, photodiodes, and bridge-based transducers without active buffering or compensation networks.
Is LM393N/NOPB pin-compatible with LM2903 or LM293?
Yes, LM393N/NOPB shares identical pinout, electrical specifications, and SOIC-8 package dimensions with LM2903 and LM293. However, LM2903 is qualified for −40°C to +85°C operation and LM293 for −25°C to +85°C, while LM393N/NOPB is limited to 0°C to +70°C - so thermal environment determines interchangeability in production designs.
LM393N/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- 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):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 700ns
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 8-PDIP
LM393N/NOPB FAQ
1.How can I place an order for LM393N/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393N/NOPB 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 LM393N/NOPB reliable?
The price and inventory of LM393N/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393N/NOPB is usually 5 days.
3.What payment methods are accepted for LM393N/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393N/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393N/NOPB?
LM393N/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393N/NOPB 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 LM393N/NOPB?
For technical support, including LM393N/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393N/NOPB requirements.
6.How does Aetrix verify that LM393N/NOPB is sourced from the original manufacturer or authorized distributors?
All LM393N/NOPB 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 LM393N/NOPB meets industry standards.
7.What is the process for return or replacement of LM393N/NOPB?
All LM393N/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM393N/NOPB, 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 LM393N/NOPB part is unused and in its original packaging.
Return procedure for LM393N/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM393N/NOPB Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
