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STMicroelectronics LM293ST
- Part No.:
- LM293ST
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
LM293ST.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8MINISO
- Quantity:
- Payment:
- Shipping:
Inventory:8,503
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Product details
Overview
LM293ST from STMicroelectronics is a dual low-voltage comparator with rail-to-rail input common-mode range including ground, designed for single-supply operation from 2 V to 36 V (or ±1 V to ±18 V). It delivers 0.45 mA supply current at 5 V, ±1 mV input offset voltage, and 80 mV output saturation voltage at 4 mA sink - enabling precision threshold detection in battery-powered industrial sensors and automotive body control modules.
For engineers reviewing the LM293ST datasheet, LM293ST pinout, LM293ST application, or LM293ST equivalent, this device supports TTL/CMOS/MOS logic interfacing, operates across -40 °C to +105 °C, and is available in MiniSO8 with exposed-pad thermal performance - critical for compact, thermally constrained comparators in power management and motor control feedback circuits.
Technical Context
The LM293ST uses PNP-input stage architecture enabling input voltages down to ground on single supply, with differential input voltage range equal to full supply rail (±36 V max). Its open-collector outputs support wired-OR logic and level translation across mixed-voltage systems.
It features low input bias current (20 nA typ.) and low input offset current (±3 nA typ.), minimizing reference loading errors in high-impedance sensor interfaces. Response time is 1.3 μs at 100 mV step with 5 mV overdrive, optimized for medium-speed zero-crossing and limit-detection tasks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 36 V single supply (±1 V to ±18 V dual) - enables direct use with 3.3 V, 5 V, 12 V, and 24 V rails without level-shifting. |
| Input Offset Voltage | ±1 mV typ. - ensures accurate threshold setting in precision window comparators and analog-to-digital front-ends. |
| Supply Current | 0.45 mA typ. at 5 V - reduces quiescent power in always-on battery monitoring and wake-up circuits. |
| Input Common-Mode Range | Includes ground (0 V) - allows direct sensing of grounded signals (e.g., current-sense shunts, thermistor dividers) without negative supply. |
| Output Saturation Voltage | 80 mV typ. at 4 mA sink - minimizes voltage drop in LED drivers or MOSFET gate pull-down applications. |
| Response Time | 1.3 μs (100 mV step, 5 mV overdrive) - suitable for line-frequency zero-crossing detection and PWM edge timing. |
| ESD Robustness | HBM: not specified for LM293ST (LM393W only rated at 2 kV) - requires external protection in handling-sensitive environments. |
Pinout & Package
LM293ST is packaged in MiniSO8 - an 8-pin surface-mount package with 0.65 mm pitch, 3.0 mm × 4.9 mm body, and exposed thermal pad (optional ground connection). Thermal resistance junction-to-ambient is 190 °C/W, supporting moderate-power dissipation in space-constrained PCB layouts.
| 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. |
| 2 | IN1− | Inverting input of comparator 1 - accepts reference or feedback signal for threshold comparison. |
| 3 | IN1+ | Non-inverting input of comparator 1 - connects to sensed signal (e.g., battery voltage, temperature divider). |
| 4 | VCC− | Negative supply terminal - tied to ground in single-supply configurations; enables true split-rail operation. |
| 5 | IN2+ | Non-inverting input of comparator 2 - independent channel for dual-threshold or hysteresis implementation. |
| 6 | IN2− | Inverting input of comparator 2 - used for reference or feedback path in second comparator stage. |
| 7 | OUT2 | Open-collector output of comparator 2 - supports independent load switching or OR-ing with OUT1. |
| 8 | VCC+ | Positive supply terminal - supplies both comparators; accepts up to 36 V DC or +18 V in dual-rail mode. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-rail input common-mode range including ground | Enables direct interface with grounded sensors (e.g., shunt resistors, NTC thermistors) without level-shifting circuitry. |
| Low 0.45 mA supply current at 5 V | Reduces system-level standby power - critical for energy harvesting nodes and long-life battery applications. |
| 80 mV output saturation voltage at 4 mA sink | Minimizes conduction loss when driving LEDs, relays, or MOSFET gates directly from output pins. |
| TTL/DTL/ECL/MOS/CMOS-compatible outputs | Supports seamless integration into mixed-logic systems without additional buffer stages or voltage translators. |
| Dual independent comparators in one package | Reduces board area and BOM count in applications requiring paired thresholds (e.g., window detectors, over/under-voltage alarms). |
Applications
| Battery Voltage Monitor | Motor Overcurrent Protection |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charge/discharge to trigger cutoff at 4.2 V (overvoltage) and 2.8 V (undervoltage). IC Role / Device Role / Timing Role: Dual comparator implements independent high/low threshold detection with hysteresis via external feedback. Use Value: Eliminates need for microcontroller ADC polling; provides deterministic, sub-microsecond response to fault conditions. |
Use Scenario: Detecting excessive current in BLDC motor phase legs using shunt resistor voltage drops. IC Role / Device Role / Timing Role: Comparator compares shunt voltage against fixed reference; output triggers gate driver shutdown. Use Value: Achieves <1.5 μs fault response time - faster than typical MCU-based protection loops and prevents IGBT destruction. |
| Zero-Crossing Detector (AC Mains) | Industrial Limit Switch Interface |
|
Use Scenario: Generating synchronized timing pulses from 50/60 Hz AC line voltage for TRIAC phase control. IC Role / Device Role / Timing Role: Single comparator configured with resistive divider and optional hysteresis to reject noise near zero crossing. Use Value: Input common-mode range includes ground enables direct AC coupling via capacitor; no negative supply required. |
Use Scenario: Interfacing mechanical limit switches (normally open/closed) to PLC digital inputs with noise immunity. IC Role / Device Role / Timing Role: Comparator acts as Schmitt-trigger buffer, converting slow-switch bounce into clean logic edges. Use Value: Low input bias current (20 nA) avoids false triggering from leakage through long cable runs or dirty contacts. |
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 | Same core architecture but rated for 0 °C to 70 °C industrial temp range; no ESD enhancement. | Limited to commercial-grade equipment; unsuitable for under-hood automotive or extended-temperature industrial enclosures. | Select when cost sensitivity outweighs temperature range requirements and ESD robustness is not critical. |
| LM293PT | Identical electrical specs and temperature grade (-40 °C to +105 °C), but in TSSOP8 (6.4 mm × 3.0 mm) with 120 °C/W RθJA. | Better thermal performance than MiniSO8 in high-density layouts; slightly larger footprint than MiniSO8. | Prefer for thermally demanding applications where PCB real estate allows TSSOP8 placement and improved heat dissipation is needed. |
Compared with LM393DT, LM293ST offers extended temperature operation and tighter input offset drift over temperature; versus LM293PT, it trades slightly higher thermal resistance for smaller PCB area and lower profile - making it optimal for compact, thermally managed industrial controllers.
Availability
LM293ST is available at Aetrix Electronics and suitable for battery management systems, motor control safety circuits, AC line synchronization, and industrial limit detection requiring stable component supply across extended temperature ranges.
Supply support for LM293ST 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, specializing in automotive, industrial, and power management ICs with strong analog and mixed-signal design heritage.
The LM293 series belongs to ST's precision analog comparators product line, engineered for reliable operation in harsh environments - targeting automotive body electronics, industrial automation, and energy-efficient power conversion systems.
FAQ
Can LM293ST operate from a 3.3 V supply?
Yes. The LM293ST supports single-supply operation from 2 V to 36 V, making it fully compatible with 3.3 V systems. At 3.3 V, its input offset voltage remains within ±2 mV (max), and output saturation voltage stays below 150 mV at 2 mA sink - ensuring reliable logic-level compatibility with 3.3 V microcontrollers and FPGAs.
Does LM293ST require external pull-up resistors on its outputs?
Yes. Both outputs are open-collector, so external pull-up resistors to VCC+ or another logic rail are mandatory to establish HIGH-state voltage levels. Typical values range from 2.2 kΩ (for speed-critical 5 V interfaces) to 10 kΩ (for low-power 3.3 V systems); value selection balances rise time, power, and noise immunity.
What is the maximum differential input voltage for LM293ST?
The absolute maximum differential input voltage is ±36 V, matching the supply rail limits. This allows safe operation even when one input exceeds VCC+ or falls below VCC−, provided the common-mode voltage stays within specification (e.g., ≥ −0.3 V relative to VCC−). This tolerance simplifies interfacing with fast transients or floating sources.
Is LM293ST pin-compatible with LM393 or LM2903?
No. While LM293ST shares identical pinout with LM293, LM393, and LM2903 in SO8, MiniSO8, TSSOP8, and DFN8 packages, LM2903 has different internal ESD structure and slightly higher input bias current (250 nA vs. 20 nA). Direct substitution may affect high-impedance sensor accuracy or noise immunity - verify layout and reference design before replacement.
LM293ST Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Open-Drain, 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:
- -40°C ~ 105°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-MiniSO
LM293ST FAQ
1.How can I place an order for LM293ST through Aetrix?
Please submit a Request for Quotation (RFQ) for LM293ST 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 LM293ST reliable?
The price and inventory of LM293ST are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM293ST is usually 5 days.
3.What payment methods are accepted for LM293ST?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM293ST transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM293ST?
LM293ST orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM293ST 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 LM293ST?
For technical support, including LM293ST datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM293ST requirements.
6.How does Aetrix verify that LM293ST is sourced from the original manufacturer or authorized distributors?
All LM293ST 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 LM293ST meets industry standards.
7.What is the process for return or replacement of LM293ST?
All LM293ST units undergo pre-shipment inspection (PSI). If there is an issue with LM293ST, 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 LM293ST part is unused and in its original packaging.
Return procedure for LM293ST:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM293ST Tags
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LM2903DR
Texas Instruments
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LM339DR
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LM339PWR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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LM393ADR
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NCX2200GMAZ
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