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Texas Instruments LM393PW
- Part No.:
- LM393PW
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM393PW.pdf
- Description:
- IC COMPARATOR 2 DIFF 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:36,131
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Product details
Overview
LM393PW from Texas Instruments is a dual voltage comparator IC designed for single-supply operation across 2 V to 36 V, featuring ±0.37 mV typical input offset voltage, 200 µA per comparator quiescent current, and 1 µs propagation delay. It operates in industrial temperature range (0°C to 70°C) and is widely used in power supply monitoring, motor control feedback, and threshold detection circuits.
For engineers reviewing the LM393PW datasheet, LM393PW pinout, LM393PW application, or LM393PW equivalent, key selection considerations include its open-collector output compatibility with TTL/MOS/CMOS logic, rail-to-rail input common-mode range including ground, and robust 38 V absolute maximum supply rating - critical for high-voltage industrial sensing and PSU supervision.
Technical Context
The LM393PW implements two independent comparators with internal ESD clamps delivering 2 kV HBM protection. Its input stage supports differential input voltages up to ±38 V and common-mode input down to ground, enabling direct interface with low-side current-sense resistors and battery-monitoring nodes without level-shifting.
Output stages are open-collector NPN transistors capable of sinking up to 21 mA at 5 V supply, compatible with external pull-up to any logic rail up to 36 V. Propagation delay remains stable across supply voltages (5–36 V) and temperature (0°C to 70°C), with typical response time of 1 µs under 5 mV overdrive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V - supports wide-input industrial and automotive power rails without regulation |
| Input Offset Voltage (typ) | ±0.37 mV - enables precise threshold detection within <10 mV windows |
| Quiescent Current (per comparator) | 200 µA - allows dual-comparator operation below 0.5 mA total, ideal for battery-backed systems |
| Propagation Delay (typ) | 1 µs - ensures fast response to overvoltage/overcurrent events in UPS and server PSUs |
| Input Bias Current (typ) | 3.5 nA - minimizes loading on high-impedance sensor sources like thermistors or photodiodes |
| Output Sink Current | 21 mA at 5 V - drives LEDs, relays, or logic inputs directly without buffer transistors |
| ESD Rating (HBM) | 2 kV - meets standard handling requirements for automated assembly and field service |
Pinout & Package
TSSOP-8 package (3.00 mm × 4.40 mm body size), thermally enhanced with exposed pad connected to GND for improved power dissipation in compact layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector NPN - requires external pull-up; sinks current when IN+ > IN− |
| 1IN− | Comparator 1 inverting input | Differential input node; accepts voltage down to −0.3 V (with current limiting) |
| 1IN+ | Comparator 1 non-inverting input | Differential input node; supports common-mode range to VCC − 2 V |
| GND | Ground reference | Return path for both comparators and thermal pad connection point |
| 2IN+ | Comparator 2 non-inverting input | Independent input; identical electrical specs to 1IN+ |
| 2IN− | Comparator 2 inverting input | Independent input; identical electrical specs to 1IN− |
| 2OUT | Comparator 2 output | Open-collector NPN - electrically isolated from 1OUT; shares no internal nodes |
| VCC | Positive supply | Single supply input for both comparators; supports up to 36 V DC |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range | Includes ground and extends to VCC − 2 V - eliminates need for input biasing in single-supply sensor interfaces |
| Open-collector outputs | Enable wired-OR logic, level translation, and direct drive of loads up to 36 V - simplifies interface with diverse logic families |
| Low input offset drift | ±4 mV max over full temperature range - ensures stable trip points in ambient-variable environments |
| High supply voltage tolerance | 38 V absolute maximum rating - provides margin against transient surges in 24 V industrial systems |
| Fast propagation with low overdrive | 1 µs response at 5 mV overdrive - enables reliable detection of small signal excursions in precision control loops |
Applications
| Power Supply Supervision | Motor Overcurrent Protection |
|---|---|
Use Scenario: Monitoring +12 V and +5 V rails in server PSUs to trigger shutdown on undervoltage or overvoltage. IC Role / Device Role / Timing Role: Dual comparator compares each rail against precision reference voltages; outputs drive OR-gated fault latch. Use Value: Enables independent, fast-response monitoring of two critical rails using one 8-pin IC - reduces BOM count and PCB area vs. discrete solutions. | Use Scenario: Detecting excessive current in cordless power tool motor drivers via low-side shunt resistor voltage. IC Role / Device Role / Timing Role: One comparator monitors shunt voltage against fixed threshold; second validates direction or enables hysteresis. Use Value: 3.5 nA input bias avoids measurement error on high-value shunts; 1 µs response prevents MOSFET destruction during short-circuit events. |
| Appliance Temperature Control | Building Automation Sensor Interface |
Use Scenario: Converting thermistor resistance changes into digital ON/OFF signals for HVAC fan speed staging. IC Role / Device Role / Timing Role: Comparator compares thermistor divider output to adjustable reference; hysteresis prevents chatter near setpoint. Use Value: Rail-to-rail input allows direct interface with thermistor networks referenced to ground - no op-amp buffer required. | Use Scenario: Interfacing 0–10 V analog sensors (e.g., CO₂, humidity) to microcontroller GPIOs in smart lighting systems. IC Role / Device Role / Timing Role: Converts analog sensor output into clean digital thresholds for occupancy or daylight harvesting decisions. Use Value: 200 µA quiescent current per comparator enables always-on sensing with minimal impact on battery life in wireless nodes. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | SOIC-8 package (4.90 mm × 3.91 mm); same electrical specs and temperature range (0°C to 70°C) | Larger footprint; better thermal performance in high-power density designs | Select when board space permits and higher thermal mass improves long-term stability |
| LM393P | PDIP-8 package (9.81 mm × 6.35 mm); identical electrical behavior but wider lead pitch and through-hole mounting | Suitable for prototyping, legacy repair, or mixed-technology assemblies requiring through-hole components | Choose for hand-soldered evaluation or replacement in existing DIP-based equipment |
Compared with LM393DR and LM393P, the LM393PW offers the smallest PCB footprint (3.00 mm × 4.40 mm) while maintaining identical comparator performance and industrial-grade reliability - making it optimal for space-constrained, high-volume surface-mount applications such as server PSUs and smart appliances.
Availability
LM393PW is available at Aetrix Electronics and suitable for power supply supervision, motor control feedback, and appliance temperature monitoring requiring stable component supply across industrial production cycles.
Supply support for LM393PW 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 experience in precision analog ICs.
The LM393PW belongs to TI's industry-standard dual comparator product line, engineered for robustness, low-cost manufacturability, and seamless drop-in replacement across generations - targeting industrial automation, consumer electronics, and power management systems.
FAQ
What is the maximum supply voltage for LM393PW?
The LM393PW has an absolute maximum supply voltage rating of 38 V, with recommended operating range from 2 V to 36 V. This 36 V upper limit ensures safe continuous operation in 24 V industrial systems with transient headroom, while the 38 V rating accommodates brief overvoltage events without damage. Always refer to Section 5.1 Absolute Maximum Ratings in the official TI datasheet for derating guidance.
Does LM393PW support rail-to-rail input operation?
Yes, the LM393PW supports rail-to-rail input common-mode voltage range, extending from ground (GND) up to VCC − 2 V. This allows direct interfacing with sensors referenced to ground - such as current-sense shunts or thermistor dividers - without external level-shifting circuitry. The datasheet confirms this in Section 5.5 Electrical Characteristics under "Common mode range".
Can LM393PW outputs drive TTL logic directly?
Yes, LM393PW outputs are open-collector and fully compatible with TTL logic when pulled up to 5 V. Each output can sink up to 21 mA at 5 V supply, exceeding the 1.6 mA sink requirement of standard TTL inputs. For reliable interfacing, use a 1–10 kΩ pull-up resistor to 5 V; ensure the load does not exceed the specified IOL limits under worst-case temperature and supply conditions.
What is the typical input offset voltage of LM393PW?
The LM393PW exhibits a typical input offset voltage of ±0.37 mV at 25°C and 5–36 V supply, with a maximum of ±4 mV over the full operating temperature range (0°C to 70°C). This low offset enables accurate threshold detection in applications like battery voltage monitoring and precision window comparators where sub-10 mV accuracy is required.
Is LM393PW pin-compatible with older LM393 variants?
Yes, the LM393PW (TSSOP-8) is pin-compatible with other LM393 variants in SOIC-8 (LM393DR), PDIP-8 (LM393P), and VSSOP-8 packages - all share identical pin numbering and function mapping per Figure 4-1 in the TI datasheet. However, thermal and mechanical characteristics differ; verify layout clearance and solder profile when substituting packages in production.
LM393PW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-TSSOP (0.173", 4.40mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-TSSOP
LM393PW FAQ
1.How can I place an order for LM393PW through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393PW 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 LM393PW reliable?
The price and inventory of LM393PW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393PW is usually 5 days.
3.What payment methods are accepted for LM393PW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393PW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393PW?
LM393PW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393PW 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 LM393PW?
For technical support, including LM393PW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393PW requirements.
6.How does Aetrix verify that LM393PW is sourced from the original manufacturer or authorized distributors?
All LM393PW 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 LM393PW meets industry standards.
7.What is the process for return or replacement of LM393PW?
All LM393PW units undergo pre-shipment inspection (PSI). If there is an issue with LM393PW, 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 LM393PW part is unused and in its original packaging.
Return procedure for LM393PW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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