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STMicroelectronics LM393WDT
- Part No.:
- LM393WDT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM393WDT.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:7,440
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Product details
Overview
LM393WDT from STMicroelectronics is a dual low-voltage comparator IC with internal 2 kV HBM ESD protection, designed for single-supply (2–36 V) or split-supply (±1 V to ±18 V) operation. It features ±1 mV typical input offset voltage, 20 nA typical input bias current, 0.45 mA supply current at 5 V, rail-to-rail differential input range, and ground-sensing inputs-enabling use in precision threshold detection and level-shifting circuits across industrial and consumer systems.
For engineers reviewing the LM393WDT datasheet, LM393WDT pinout, LM393WDT application, or LM393WDT equivalent, this device is selected for low-power, ground-referenced comparator functions requiring robust ESD immunity, TTL/CMOS-compatible open-collector outputs, and stable performance across wide supply ranges without external biasing.
Technical Context
The LM393WDT integrates two independent PNP-input comparators with common-mode input voltage range extending to ground-even under single-supply operation-enabling direct sensing of signals referenced to system ground. Its open-collector outputs support wired-OR logic and level translation across mixed-voltage domains.
Designed for high noise immunity and low static power, it delivers 1.3 μs typical response time with 100 mV input overdrive and maintains <80 mV output saturation voltage at 4 mA sink current-critical for driving LEDs, relays, or logic interfaces with minimal voltage drop.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V single supply or ±1 V to ±18 V dual supply - supports battery-powered and industrial rail systems without level-shifting circuitry. |
| Input Offset Voltage | ±1 mV typ. - enables accurate threshold detection down to millivolt-level signal differentials. |
| Supply Current | 0.45 mA typ. at 5 V - allows integration into always-on, low-quiescent-current monitoring circuits. |
| Input Bias Current | 20 nA typ. - minimizes loading on high-impedance sensor sources like thermistors or photodiodes. |
| Output Saturation Voltage | 80 mV typ. at 4 mA sink - ensures reliable logic-low assertion when driving TTL or CMOS inputs directly. |
| ESD Robustness | 2 kV HBM on all pins - eliminates need for external ESD protection in board-level designs targeting IEC 61000-4-2 Level 2 environments. |
| Response Time | 1.3 μs typical (100 mV overdrive) - suitable for medium-speed zero-crossing detection and pulse-width monitoring up to ~300 kHz. |
Pinout & Package
LM393WDT is available in SO8 package (standard small-outline), with 1.27 mm lead pitch, 4.8–5.0 mm body width, and surface-mount compatibility per JEDEC MS-012. The exposed pad in DFN8 variant is optional for grounding; SO8 version has no thermal pad.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of Comparator 1 - requires external pull-up to define logic-high level and interface voltage domain. |
| 2 | IN1− | Inverting input of Comparator 1 - accepts reference or feedback signal; common-mode range includes ground. |
| 3 | IN1+ | Non-inverting input of Comparator 1 - connects to sensed signal; differential input range equals full supply rails. |
| 4 | GND / VCC− | Negative supply or ground reference - serves as return path for both comparators and defines lower rail for input common-mode range. |
| 5 | IN2+ | Non-inverting input of Comparator 2 - electrically isolated from Channel 1; supports independent dual-threshold configurations. |
| 6 | IN2− | Inverting input of Comparator 2 - used for differential sensing or hysteresis feedback without cross-talk. |
| 7 | OUT2 | Open-collector output of Comparator 2 - independently controllable; supports OR-ing with OUT1 via shared pull-up. |
| 8 | VCC+ | Positive supply rail - powers both comparators; supports up to 36 V, enabling direct connection to 24 V industrial buses. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | PnP input architecture allows common-mode voltage down to 0 V on single supply - eliminates need for negative rail in sensor interface circuits. |
| 2 kV HBM ESD protection | Integrated protection on all pins reduces BOM count and PCB area vs. discrete TVS diodes - validated per JEDEC JESD22-A114F. |
| Wide supply flexibility | Operates from 2 V to 36 V single supply or ±1 V to ±18 V dual supply - supports legacy 5 V logic, modern 3.3 V microcontrollers, and 24 V industrial control rails. |
| Low quiescent power | 0.45 mA supply current independent of VCC - enables multi-year battery life in portable voltage-monitoring applications. |
| Open-collector outputs | Supports wired-OR logic, level translation, and direct drive of LEDs, MOSFET gates, or optocouplers without additional buffering. |
Applications
| Overvoltage Protection Circuit | Zero-Crossing Detector |
|---|---|
|
Use Scenario: Monitoring DC bus voltage in a 24 V industrial power supply to trigger shutdown before reaching 28 V. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel compares against upper threshold, second against lower threshold. Use Value: ±1 mV offset ensures trip point accuracy within ±0.05% of 28 V, while 2 kV ESD rating prevents latch-up during field ESD events. |
Use Scenario: Detecting AC line zero crossings in a TRIAC-based dimmer for phase-angle control. IC Role / Device Role / Timing Role: Single comparator with resistive divider and hysteresis - converts sine wave to clean square wave synchronized to zero crossing. Use Value: 1.3 μs propagation delay enables timing resolution better than 0.1° at 50 Hz, and ground-sensing input avoids external bias network. |
| Temperature Threshold Alarm | Optical Pulse Discriminator |
|
Use Scenario: Triggering fan activation when heatsink temperature exceeds 65 °C using NTC thermistor divider. IC Role / Device Role / Timing Role: Comparator comparing thermistor voltage against precision reference - hysteresis added via feedback resistor. Use Value: 20 nA input bias current prevents measurement error in high-resistance thermistor networks (>100 kΩ), ensuring ±0.5 °C accuracy. |
Use Scenario: Converting analog photodiode pulses from an optical encoder into digital quadrature signals. IC Role / Device Role / Timing Role: Dual comparator processing A/B channel signals - each channel provides edge-aligned logic outputs for direction decoding. Use Value: Rail-to-rail differential input range accommodates varying photodiode output amplitudes (100 mV–2 V), and open-collector outputs interface directly to 3.3 V MCU GPIOs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual low-voltage comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DT | No integrated ESD protection (HBM rated at 500 V); identical electrical specs and pinout. | Lacks robustness in uncontrolled ESD environments; requires external protection for Class 2+ compliance. | Select when cost sensitivity outweighs field reliability requirements and PCB layout allows discrete ESD components. |
| TLV3702IDR | Rail-to-rail input/output, 1.8 V min supply, 85 μA supply current - lower power but narrower voltage range (1.8–16 V). | Better suited for ultra-low-power battery systems; incompatible with 24 V industrial rails. | Choose for portable devices needing sub-100 μA quiescent current and 3.3 V logic compatibility, not for wide-supply industrial use. |
Compared with LM393DT and TLV3702IDR, LM393WDT uniquely balances industrial-grade supply range (2–36 V), ground-sensing capability, and factory-integrated 2 kV HBM protection-making it optimal for cost-sensitive yet reliability-critical industrial monitoring where external ESD components are undesirable.
Availability
LM393WDT is available at Aetrix Electronics and suitable for overvoltage protection, zero-crossing detection, temperature threshold alarms, and optical pulse discrimination requiring stable component supply across automotive aftermarket, industrial automation, and smart building control programs.
Supply support for LM393WDT 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, delivering intelligent power, sensing, and control solutions for automotive, industrial, and consumer markets.
LM393WDT belongs to ST's legacy analog comparator product line, engineered for robustness and interoperability in cost-sensitive industrial and appliance applications where reliability under variable supply and ESD stress is essential.
FAQ
Can LM393WDT operate from a single 3.3 V supply?
Yes. LM393WDT supports single-supply operation from 2 V to 36 V, including 3.3 V. Its input common-mode range extends to ground, and output saturation voltage remains below 400 mV at 4 mA sink current-ensuring reliable logic-low assertion when interfacing with 3.3 V microcontrollers via appropriate pull-up resistors.
Does LM393WDT require external hysteresis for stable switching?
Yes, unless inherent system noise is negligible. The device has no internal hysteresis; external positive feedback (e.g., resistor from OUT to IN+) must be added to prevent oscillation near threshold. Typical hysteresis widths range from 10 mV to 100 mV depending on application noise margin and resistor values.
What is the maximum sink current per output of LM393WDT?
The absolute maximum continuous output sink current is 20 mA, independent of supply voltage. However, the recommended operating condition is ≤18 mA at Tamb = 25 °C. Sustained currents above 6 mA increase junction temperature significantly-thermal derating is required above 70 °C ambient.
Is LM393WDT pin-compatible with standard LM393 variants?
Yes. LM393WDT shares identical pinout, electrical characteristics, and package dimensions with LM393DT, LM393ADT, and LM393PT across SO8, TSSOP8, MiniSO8, and DFN8 packages. The only functional difference is the enhanced 2 kV HBM ESD rating-no layout or schematic changes are needed for drop-in replacement.
LM393WDT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- 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):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM393WDT FAQ
1.How can I place an order for LM393WDT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393WDT 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 LM393WDT reliable?
The price and inventory of LM393WDT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393WDT is usually 5 days.
3.What payment methods are accepted for LM393WDT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393WDT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393WDT?
LM393WDT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393WDT 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 LM393WDT?
For technical support, including LM393WDT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393WDT requirements.
6.How does Aetrix verify that LM393WDT is sourced from the original manufacturer or authorized distributors?
All LM393WDT 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 LM393WDT meets industry standards.
7.What is the process for return or replacement of LM393WDT?
All LM393WDT units undergo pre-shipment inspection (PSI). If there is an issue with LM393WDT, 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 LM393WDT part is unused and in its original packaging.
Return procedure for LM393WDT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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