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Texas Instruments LM393M/NOPB
- Part No.:
- LM393M/NOPB
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM393M/NOPB.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,110
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Product details
Overview
LM393M/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. It delivers ±3 mV max input offset voltage, 0.4 mA supply current at 5 V, and input common-mode range extending to ground - enabling accurate threshold detection in battery-powered and industrial sensing systems.
For engineers reviewing the LM393M/NOPB datasheet, LM393M/NOPB pinout, LM393M/NOPB application, or LM393M/NOPB equivalent, this page provides verified electrical parameters, SOIC-8 package mapping, real-world use cases including zero-crossing detection and limit comparison, and two validated alternative parts with documented functional and thermal differences.
Technical Context
The LM393M/NOPB integrates two independent PNP-input comparators with rail-to-rail input capability down to ground and differential input voltage tolerance up to ±36 V. Its open-collector NPN output stage supports TTL/CMOS logic interfacing and wired-OR configurations, with 16 mA sink capability and 250 mV saturation voltage at 4 mA load.
Designed for operation across 0°C to +70°C ambient, it features low input bias current (25 nA typ), low input offset current (±5 nA), and supply current independent of V+, making it suitable for high-impedance sensor interfaces and energy-constrained applications where stable reference comparison is critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 36 V single supply; enables direct integration into 3.3 V, 5 V, 12 V, and 24 V systems without level-shifting. |
| Input Offset Voltage | ±3 mV max; ensures accurate threshold detection within ±0.1% error at 3 V reference, critical for precision limit switches. |
| Supply Current | 0.4 mA at 5 V (both comparators); allows continuous operation in coin-cell–powered devices for >1 year at 10 μA average system budget. |
| Input Bias Current | 25 nA typ; permits use with >1 MΩ source impedances (e.g., thermistors, photodiodes) without significant voltage drop. |
| Output Saturation Voltage | 250 mV at 4 mA sink; guarantees reliable LOW-level logic assertion even under moderate load, compatible with 3.3 V CMOS inputs. |
| Common-Mode Input Range | Includes ground (0 V) to V+−1.5 V; supports direct sensing of signals referenced to system ground in single-supply architectures. |
| Response Time | 1.3 μs typical (100 mV step, 5 mV overdrive); sufficient for line-frequency monitoring (50/60 Hz) and slow PWM feedback loops. |
Pinout & Package
LM393M/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 gull-wing leads. This RoHS-compliant, surface-mount package supports automated reflow assembly and offers thermal resistance (RθJA) of 123°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA (Pin 1) | Open-collector output, Channel A | Sinks current to ground when +INA > −INA; requires external pull-up to define HIGH logic level (e.g., to 3.3 V or 5 V). |
| −INA (Pin 2) | Inverting input, Channel A | Accepts reference voltage or threshold signal; high-impedance node (25 nA bias) minimizes loading on precision dividers. |
| +INA (Pin 3) | Non-inverting input, Channel A | Receives sensed analog signal (e.g., battery voltage, temperature sensor output); common-mode range includes ground. |
| GND (Pin 4) | Ground reference | System return path for both comparators and internal bias network; must be low-impedance to maintain offset stability. |
| +INB (Pin 5) | Non-inverting input, Channel B | Independent second sensing input; usable for dual-threshold detection (e.g., window comparator with external resistors). |
| −INB (Pin 6) | Inverting input, Channel B | Second reference input; can be tied to same or different threshold as Channel A for redundant or complementary logic. |
| OUTB (Pin 7) | Open-collector output, Channel B | Independent output for second comparison; may be wire-OR'd with OUTA using shared pull-up for logical OR function. |
| V+ (Pin 8) | Positive power supply | Supplies both comparators; current draw (0.4 mA) remains constant across 2.0–36 V, simplifying power budgeting. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply operation from 2.0 V | Enables direct use with Li-ion (3.0–4.2 V), USB (5 V), and industrial 12/24 V rails without negative supply generation. |
| Input common-mode range includes ground | Allows direct comparison of 0–V+ signals (e.g., battery voltage vs. 2.5 V reference) without level-shifting circuitry. |
| Open-collector outputs with 16 mA sink | Supports flexible logic interfacing (TTL/CMOS), wired-OR bus structures, and direct driving of LEDs or small relays. |
| Low 0.4 mA supply current | Reduces self-heating and extends battery life in portable equipment; current is supply-voltage-independent for predictable design. |
| ±3 mV max input offset voltage | Ensures consistent trip-point accuracy across temperature and unit-to-unit variation, critical for repeatable fault detection. |
Applications
| Battery Voltage Monitor | Industrial Limit Switch |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging/discharging to trigger cutoff at 2.8 V (low) and 4.25 V (high). IC Role / Device Role / Timing Role: Dual comparator configured as window detector, comparing sensed voltage against two precision references. Use Value: Prevents over-discharge and overcharge without microcontroller intervention; leverages ground-referenced inputs and open-collector outputs for direct MOSFET gate control. |
Use Scenario: Detecting mechanical actuation of a factory floor limit switch with 24 V DC supply and noisy industrial environment. IC Role / Device Role / Timing Role: High-immunity comparator converting analog position signal into clean digital enable/disable signal for PLC input. Use Value: Input common-mode range to ground rejects common-mode noise; 36 V supply rating tolerates 24 V transients per IEC 61000-4-4. |
| Zero-Crossing Detector | Power Supply Sequencing |
|
Use Scenario: Converting AC mains waveform (120 V RMS) to synchronized square wave for TRIAC phase control in dimmer circuits. IC Role / Device Role / Timing Role: Single comparator biased at 0 V (GND), detecting polarity transitions of transformer-coupled AC signal. Use Value: Ground-inclusive input range eliminates need for bipolar supply or DC offset; open-collector output interfaces directly to optocoupler LED. |
Use Scenario: Ensuring correct power-up order of FPGA core (1.0 V) and I/O (3.3 V) rails in embedded systems. IC Role / Device Role / Timing Role: Dual comparator monitoring each rail voltage against dedicated thresholds to generate RESET signals. Use Value: Low supply current avoids loading sensitive reference dividers; independent channels allow separate timing margins for each rail. |
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 −40°C to +125°C operating range (vs. LM393M/NOPB's 0°C to +70°C). | Required for automotive under-hood or extended-temperature industrial deployments where ambient exceeds 70°C. | Select LM393DR when full industrial temperature range and AEC-Q200 qualification are needed; otherwise LM393M/NOPB suffices for commercial-grade designs. |
| TLV3702IDR | Lower supply current (85 μA), rail-to-rail input, but only 5.5 V max supply and CMOS output (push-pull, not open-collector). | Not suitable for wired-OR buses or interfacing with 12/24 V logic; ideal for ultra-low-power 3.3 V sensor nodes requiring fast response (1.5 μs). | Choose TLV3702IDR only for battery-sensitive 3.3 V systems needing rail-to-rail input and push-pull output; avoid if open-collector or >5.5 V operation is required. |
Compared with LM393M/NOPB, LM393DR extends thermal reliability without altering pinout or functionality, while TLV3702IDR trades open-collector flexibility and voltage range for microamp-level quiescent current and rail-to-rail precision - making them non-interchangeable without circuit redesign.
Availability
LM393M/NOPB is available at Aetrix Electronics and suitable for battery-powered instrumentation, industrial limit detection, and AC zero-crossing applications requiring stable component supply across production lifecycles.
Supply support for LM393M/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 specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The LM393M/NOPB belongs to TI's legacy precision comparator family, engineered for cost-sensitive, high-reliability applications where ground-sensing capability, wide supply range, and open-collector interoperability are essential design requirements.
FAQ
What is the maximum supply voltage for LM393M/NOPB?
The LM393M/NOPB supports a maximum supply voltage of 36 V in single-supply mode or ±18 V in dual-supply mode. Absolute maximum ratings confirm differential input voltage tolerance up to ±36 V, allowing safe operation even when inputs exceed V+ - provided the lower input stays above −0.3 V. This makes LM393M/NOPB robust for industrial 24 V systems with transient spikes.
Does LM393M/NOPB require a dual power supply?
No, LM393M/NOPB is explicitly designed for single-supply operation from 2.0 V to 36 V, with input common-mode range extending to ground. Its PNP input stage enables accurate comparison of signals referenced to GND without negative supply rails - a key advantage over older comparator families. Dual-supply use (±1.0 V to ±18 V) is supported but not required.
Can unused comparator channels on LM393M/NOPB be left floating?
No - all pins of unused comparators on LM393M/NOPB must be tied to a defined potential. Per TI's datasheet guidance, unused inputs should be connected to the negative supply (GND in single-supply use), and the corresponding output should be left unconnected or pulled up. Floating inputs cause unpredictable output states and increased supply current due to internal transistor leakage paths.
What is the output configuration of LM393M/NOPB?
LM393M/NOPB features open-collector NPN outputs on both channels (OUTA and OUTB). Each output sinks current to ground when active and requires an external pull-up resistor to define the HIGH logic level. This configuration enables wired-OR logic, interface with multiple logic families (TTL, CMOS, ECL), and direct driving of loads like LEDs or small relays - all without level-shifting components.
How does LM393M/NOPB handle input overvoltage conditions?
LM393M/NOPB tolerates input voltages up to 36 V regardless of V+ magnitude, and its inputs can go as low as −0.3 V without damage. However, sustained input voltages below −0.3 V forward-bias internal PNP base-collector junctions, causing temporary output misbehavior (e.g., forced HIGH state) until the input recovers. For protection in noisy environments, external clamping diodes to GND and V+ are recommended per TI application note SNVA009.
LM393M/NOPB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm 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):
- 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:
- Surface Mount
- :
- 8-SOIC
LM393M/NOPB FAQ
1.How can I place an order for LM393M/NOPB through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393M/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 LM393M/NOPB reliable?
The price and inventory of LM393M/NOPB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393M/NOPB is usually 5 days.
3.What payment methods are accepted for LM393M/NOPB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393M/NOPB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393M/NOPB?
LM393M/NOPB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393M/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 LM393M/NOPB?
For technical support, including LM393M/NOPB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393M/NOPB requirements.
6.How does Aetrix verify that LM393M/NOPB is sourced from the original manufacturer or authorized distributors?
All LM393M/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 LM393M/NOPB meets industry standards.
7.What is the process for return or replacement of LM393M/NOPB?
All LM393M/NOPB units undergo pre-shipment inspection (PSI). If there is an issue with LM393M/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 LM393M/NOPB part is unused and in its original packaging.
Return procedure for LM393M/NOPB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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