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STMicroelectronics LM393D
- Part No.:
- LM393D
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM393D.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,630
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Product details
Overview
LM393D from STMicroelectronics is a dual low-voltage comparator IC designed for single-supply operation from 2 V to 36 V (or ±1 V to ±18 V), featuring ±1 mV typical input offset voltage, 20 nA typical input bias current, and 0.45 mA supply current per comparator at 5 V. It supports TTL/DTL/ECL/MOS/CMOS logic interfacing and operates with input common-mode range extending to ground - enabling direct sensing of near-ground signals in battery-powered and industrial monitoring systems.
For engineers reviewing the LM393D datasheet, LM393D pinout, LM393D application, or LM393D equivalent, this device is selected for precision threshold detection, zero-crossing sensing, and level-shifting in power management, sensor interface, and analog front-end circuits where rail-to-rail input capability and low quiescent power are critical.
Technical Context
The LM393D implements two independent open-collector comparators with PNP input stages, allowing input voltages down to ground on single supplies while maintaining stable operation across wide temperature ranges (0 °C to 70 °C). Its differential input voltage range equals the full supply voltage (±36 V), supporting robust signal discrimination even under mismatched reference conditions.
Output stage design enables direct interface with TTL, CMOS, and ECL logic families via external pull-up, with 80 mV typical saturation voltage at 4 mA sink current. Internal architecture avoids phase reversal and ensures monotonic response over the entire common-mode range, eliminating false triggering in noisy environments.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V single supply (±1 V to ±18 V dual) - supports wide-input industrial and automotive battery systems without regulation. |
| Input Offset Voltage | ±1 mV typ. - enables accurate threshold detection within 1 mV error margin at room temperature. |
| Input Bias Current | 20 nA typ. - minimizes loading on high-impedance sources like thermistors or photodiodes. |
| Supply Current | 0.45 mA per comparator at 5 V - delivers ultra-low power consumption for always-on sensing applications. |
| Output Saturation Voltage | 80 mV typ. at 4 mA sink - ensures strong logic-low assertion compatible with 3.3 V and 5 V digital inputs. |
| Response Time | 1.3 μs (100 mV step, 5 mV overdrive) - suitable for sub-MHz signal conditioning and pulse-width detection. |
| Common-Mode Input Range | Includes ground (0 V) on single supply - allows direct connection of sensors referenced to system ground. |
Pinout & Package
LM393D is supplied in SO8 package (standard small-outline 8-pin), with exposed pad optional for thermal enhancement. Pin functions are validated per STMicroelectronics DS0443 Rev 17 schematic and pinout diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 1 (open-collector) | Sinks current to ground; requires external pull-up for logic-high output state. |
| 2 | Inverting Input 1 | Accepts reference or signal input; PNP input stage enables ground-referenced operation. |
| 3 | Non-inverting Input 1 | Accepts variable signal; common-mode range includes ground for single-supply use. |
| 4 | VCC− (GND for single supply) | Return path for both comparators; tied to system ground in standard configurations. |
| 5 | Non-inverting Input 2 | Second independent comparator input; identical electrical behavior to Pin 3. |
| 6 | Inverting Input 2 | Second independent comparator input; supports dual-threshold or window-comparator topologies. |
| 7 | Output 2 (open-collector) | Independent open-collector output; electrically isolated from Output 1. |
| 8 | VCC+ (positive supply) | Primary power rail; supports up to 36 V, enabling direct connection to unregulated DC rails. |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply ground-sensing input | Input common-mode range extends to 0 V - eliminates need for negative supply in sensor-level detection. |
| Low-power operation | 0.45 mA total supply current at 5 V - reduces thermal load and extends battery life in portable systems. |
| Logic-family compatibility | TTL/DTL/ECL/MOS/CMOS output interface - simplifies integration with mixed-signal microcontrollers and FPGAs. |
| Wide supply tolerance | Operates from 2 V to 36 V - accommodates 3.3 V, 5 V, 12 V, and 24 V industrial bus architectures. |
| Dual independent comparators | Two fully isolated channels in one SO8 package - enables compact window detectors or dual-threshold alarms. |
Applications
| Overvoltage Protection Circuit | Zero-Crossing Detector |
|---|---|
|
Use Scenario: Monitoring DC bus voltage in power supplies to trigger shutdown before capacitor overvoltage. IC Role / Device Role / Timing Role: Dual comparator configured as window detector comparing sensed voltage against upper and lower thresholds. Use Value: ±1 mV offset ensures precise trip points; open-collector outputs drive latch or MCU interrupt directly. |
Use Scenario: Detecting AC line zero crossings for TRIAC phase control in lighting or motor drives. IC Role / Device Role / Timing Role: Single comparator comparing AC waveform to ground-referenced 0 V threshold. Use Value: Ground-inclusive input range enables direct AC coupling without level-shifting; 1.3 μs response ensures <1° timing error at 50 Hz. |
| Temperature Threshold Alarm | Photodiode Signal Comparator |
|
Use Scenario: Triggering fan activation when thermistor voltage exceeds preset level in embedded thermal management. IC Role / Device Role / Timing Role: One comparator channel compares thermistor divider output to fixed reference voltage. Use Value: 20 nA input bias current prevents measurement error in high-resistance thermistor networks (>100 kΩ). |
Use Scenario: Converting weak photodiode current into digital presence/absence signal in optical encoders or smoke detectors. IC Role / Device Role / Timing Role: Comparator amplifies and digitizes transimpedance amplifier output for edge detection. Use Value: 80 mV output saturation ensures reliable logic-low recognition by 3.3 V microcontrollers even under 4 mA load. |
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 |
|---|---|---|---|
| LM393DR (TI) | Identical electrical specs but different ESD rating (1.5 kV HBM vs. ST's 2 kV for LM393W variant); SO8 footprint compatible. | Same functional role; no change required in schematics or layout for LM393D replacement. | Select when TI-sourced supply chain alignment is required; verify ESD requirements match system-level test plan. |
| TLV3702IDR (TI) | Lower supply current (80 µA), rail-to-rail input, but narrower supply range (2.7 V–16 V); SO8 pinout differs (output pins swapped). | Not drop-in; requires PCB redesign and firmware adjustment for output polarity inversion. | Choose only for ultra-low-power battery applications where 2.7 V minimum supply is acceptable and layout revision is feasible. |
Compared with LM393DR, LM393D offers identical functionality with ST-specific qualification and packaging; TLV3702IDR trades power efficiency for reduced voltage headroom and non-compatible pinout - making LM393D optimal for cost-sensitive, wide-supply industrial designs requiring proven reliability.
Availability
LM393D is available at Aetrix Electronics and suitable for overvoltage protection circuits, zero-crossing detection, temperature threshold alarms, and photodiode signal conditioning requiring stable component supply across industrial, instrumentation, and embedded control programs.
Supply support for LM393D 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 silicon solutions for smart mobility, power management, and industrial automation.
The LM393 series belongs to ST's precision analog comparator product line, engineered for robust performance in harsh environments where ground-referenced sensing, wide supply flexibility, and long-term stability are essential.
FAQ
Can LM393D operate from a single 3.3 V supply?
Yes. LM393D supports single-supply operation from 2 V to 36 V, including 3.3 V. Its input common-mode range includes ground, and output saturation voltage remains below 400 mV at 4 mA sink current - ensuring clean logic-low levels compatible with 3.3 V I/O standards.
Does LM393D require external pull-up resistors on its outputs?
Yes. Both outputs are open-collector and must be pulled up to a valid logic-high voltage (e.g., VCC or another rail) using external resistors. Typical values range from 1 kΩ to 10 kΩ depending on speed and load requirements; no internal pull-ups are present.
What is the maximum input differential voltage for LM393D?
The absolute maximum differential input voltage is ±36 V, matching the supply voltage range. This allows safe operation even when one input exceeds the supply rail - provided the other stays within the common-mode range (0 V to VCC−1.5 V at 25 °C).
Is LM393D pin-compatible with LM339?
No. LM339 is a quad comparator in 14-pin SOIC/N packages with different pinout (e.g., VCC on Pin 3, GND on Pin 12). LM393D is dual-channel in 8-pin SOIC with VCC on Pin 8 and GND on Pin 4 - direct substitution requires board redesign and signal reassignment.
LM393D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- 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):
- 18mA @ 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
LM393D FAQ
1.How can I place an order for LM393D through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393D 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 LM393D reliable?
The price and inventory of LM393D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393D is usually 5 days.
3.What payment methods are accepted for LM393D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393D?
LM393D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393D 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 LM393D?
For technical support, including LM393D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393D requirements.
6.How does Aetrix verify that LM393D is sourced from the original manufacturer or authorized distributors?
All LM393D 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 LM393D meets industry standards.
7.What is the process for return or replacement of LM393D?
All LM393D units undergo pre-shipment inspection (PSI). If there is an issue with LM393D, 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 LM393D part is unused and in its original packaging.
Return procedure for LM393D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM393D Tags
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