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STMicroelectronics LM393PT
- Part No.:
- LM393PT
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
LM393PT.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:21,027
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Product details
Overview
LM393PT 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 TTL/CMOS-compatible open-collector outputs. It operates across 0 °C to 70 °C and is packaged in TSSOP8 for space-constrained industrial sensing and power monitoring circuits.
For engineers reviewing the LM393PT datasheet, LM393PT pinout, LM393PT application, or LM393PT equivalent, this device is selected for precision threshold detection where ground-referenced inputs, low quiescent current (0.45 mA), and rail-to-rail differential input range are required - especially in battery-powered comparators, zero-crossing detectors, and analog front-end signal conditioning.
Technical Context
The LM393PT integrates two independent PNP-input comparators with input common-mode voltage range extending to ground under single-supply operation - enabling direct interfacing with 0 V referenced sensors. Its open-collector outputs support wired-OR logic and level translation across mixed-voltage systems.
It delivers 1.3 μs typical response time at 100 mV overdrive with 5.1 kΩ load, and maintains stable performance across supply voltages up to 36 V while consuming only 1 mW per comparator at 5 V - making it suitable for low-power industrial control and automotive body electronics where supply headroom varies.
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 rails and battery-backed systems. |
| Input Offset Voltage | ±1 mV typ. - enables accurate threshold detection within ±10 mV windows without trimming. |
| Input Bias Current | 20 nA typ. - minimizes loading on high-impedance sensor sources like thermistors or photodiodes. |
| Supply Current | 0.45 mA typ. at 5 V - allows continuous operation in always-on 10 μA–100 μA power budgets. |
| Output Sink Current | 6 mA min. at Vo = 1.5 V - drives LEDs, small relays, or logic inputs directly without external buffers. |
| Response Time | 1.3 μs typ. (100 mV step, 5 mV overdrive) - sufficient for line-frequency monitoring and slow PWM feedback loops. |
| Common-Mode Input Range | Includes ground (0 V) at VCC+ = 30 V - permits direct connection of unbuffered transducer outputs referenced to system ground. |
Pinout & Package
LM393PT is supplied in a RoHS-compliant, lead-free TSSOP8 package (3.0 mm × 4.4 mm × 1.05 mm height), optimized for automated assembly and thermal performance (RthJA = 120 °C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Out1) | Comparator 1 output | Open-collector NPN output - requires external pull-up to define logic HIGH level and sink up to 6 mA. |
| 2 (In1−) | Comparator 1 inverting input | Differential input node with 20 nA bias current - connects to reference voltage or feedback network. |
| 3 (In1+) | Comparator 1 non-inverting input | High-impedance input accepting ground-referenced signals up to (VCC+ − 1.5 V) at 25 °C. |
| 4 (GND / VCC−) | Negative supply / ground | Reference return for both comparators and internal circuitry - must be low-impedance for noise immunity. |
| 5 (In2+) | Comparator 2 non-inverting input | Independent high-Z input - used for second threshold comparison or hysteresis feedback. |
| 6 (In2−) | Comparator 2 inverting input | Matches Pin 2 electrical behavior - supports dual-sensor monitoring or window comparator top/bottom thresholds. |
| 7 (Out2) | Comparator 2 output | Open-collector output identical to Pin 1 - enables independent control of two loads or logic states. |
| 8 (VCC+) | Positive supply | Single-supply rail from 2 V to 36 V - powers both comparators and defines output HIGH level via external pull-up. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | PNP differential pair enables common-mode input down to 0 V - eliminates need for level-shifting op amps in single-supply sensor interfaces. |
| Low-power operation | 0.45 mA supply current independent of VCC - reduces self-heating and extends battery life in portable instrumentation. |
| Wide supply flexibility | Operates from 2 V (e.g., LiFePO₄) to 36 V (e.g., 24 V industrial bus) - avoids separate LDOs in multi-rail systems. |
| ESD-hardened outputs | Robust open-collector structure withstands transient coupling - simplifies layout near noisy motors or relay coils. |
| Multi-package availability | TSSOP8 footprint matches SO8 pinout - allows drop-in replacement in existing layouts without PCB redesign. |
Applications
| Overvoltage Protection Circuit | Zero-Crossing Detector |
|---|---|
|
Use Scenario: Monitoring 12 V DC input to shut down downstream converters if voltage exceeds 13.2 V. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one compares against upper threshold, second validates lower bound. Use Value: ±1 mV offset ensures trip point accuracy within ±10 mV, and 0.45 mA quiescent current prevents false triggers during standby. |
Use Scenario: Detecting AC line zero crossings in a 50 Hz mains-synchronized dimmer controller. IC Role / Device Role / Timing Role: Single comparator comparing rectified sine wave to ground reference - output pulses trigger TRIAC gate timing. Use Value: Input common-mode range including ground allows direct connection to bridge rectifier output without bias resistors. |
| Thermal Threshold Monitor | LED Status Indicator Driver |
|
Use Scenario: Activating cooling fan when NTC thermistor voltage crosses 1.8 V at 60 °C. IC Role / Device Role / Timing Role: Comparator compares thermistor divider output to precision reference - output drives MOSFET gate. Use Value: 20 nA input bias current avoids measurement error in high-resistance (100 kΩ) thermistor networks. |
Use Scenario: Driving red/green LED pair to indicate system power (ON/OFF) and fault (blinking). IC Role / Device Role / Timing Role: Dual comparator outputs sink current through series LED/resistor - no external transistor needed. Use Value: 6 mA minimum sink current supports standard 2 mA LEDs with margin, while open-collector outputs enable shared pull-up for logic-level compatibility. |
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 (SO8) | Same electrical specs, but in larger SO8 package (5.0 mm × 6.2 mm) with higher RthJA (125 °C/W). | Better suited for prototyping or through-hole rework; less optimal for dense PCBs. | Select when board space allows and hand-soldering or socketing is preferred. |
| LM393ST (MiniSO8) | Identical performance, MiniSO8 package (3.0 mm × 4.9 mm), RthJA = 190 °C/W - slightly worse thermal dissipation than TSSOP8. | Compatible with fine-pitch pick-and-place but requires tighter stencil aperture control. | Choose when legacy MiniSO8 footprint reuse is required and thermal load remains below 100 mW. |
Compared with LM393DT and LM393ST, the LM393PT offers superior thermal performance (RthJA = 120 °C/W) and smaller footprint (TSSOP8), making it optimal for compact, thermally constrained designs requiring long-term reliability at elevated ambient temperatures.
Availability
LM393PT is available at Aetrix Electronics and suitable for overvoltage protection circuits, zero-crossing detectors, thermal threshold monitors, and LED status indicator drivers requiring stable component supply across industrial production cycles.
Supply support for LM393PT 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 automotive, industrial, and consumer markets since 1987.
The LM393 product line targets cost-sensitive, high-volume analog signal conditioning - emphasizing single-supply simplicity, ground-referenced operation, and robustness in harsh environments.
FAQ
Can LM393PT operate from a 3.3 V supply?
Yes. The LM393PT supports single-supply operation from 2 V to 36 V, including 3.3 V logic rails. At 3.3 V, its input common-mode range extends from 0 V to 1.8 V (VCC+ − 1.5 V), and output saturation voltage remains ≤400 mV at 4 mA sink - ensuring reliable interface with 3.3 V microcontrollers.
Does LM393PT require external pull-up resistors on its outputs?
Yes. Both outputs are open-collector NPN structures and must be pulled up to a defined voltage (e.g., VCC+, 3.3 V, or 5 V) via external resistors. Typical values range from 2.2 kΩ to 10 kΩ depending on speed and load current requirements - no internal pull-ups are present.
What is the maximum differential input voltage the LM393PT can tolerate?
The LM393PT supports differential input voltage up to ±36 V (absolute maximum rating), exceeding its supply rails. This allows safe operation when one input is driven above VCC+ or below GND - provided the common-mode voltage stays within specified limits and input clamping diodes are not forward-biased.
Is LM393PT pin-compatible with legacy LM393 variants from other manufacturers?
Yes. The LM393PT uses the industry-standard 8-pin dual comparator pinout (Out1, In1−, In1+, GND, In2+, In2−, Out2, VCC+), matching TI, ON Semiconductor, and Diodes Inc. LM393 devices in TSSOP8, SO8, and MiniSO8 packages - enabling direct substitution in most designs.
LM393PT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-TSSOP (0.173", 4.40mm 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):
- 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-TSSOP
LM393PT FAQ
1.How can I place an order for LM393PT through Aetrix?
Please submit a Request for Quotation (RFQ) for LM393PT 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 LM393PT reliable?
The price and inventory of LM393PT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM393PT is usually 5 days.
3.What payment methods are accepted for LM393PT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM393PT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM393PT?
LM393PT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM393PT 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 LM393PT?
For technical support, including LM393PT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM393PT requirements.
6.How does Aetrix verify that LM393PT is sourced from the original manufacturer or authorized distributors?
All LM393PT 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 LM393PT meets industry standards.
7.What is the process for return or replacement of LM393PT?
All LM393PT units undergo pre-shipment inspection (PSI). If there is an issue with LM393PT, 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 LM393PT part is unused and in its original packaging.
Return procedure for LM393PT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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