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STMicroelectronics LM293D
- Part No.:
- LM293D
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM293D.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,067
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Product details
Overview
LM293D 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 80 mV typical output saturation voltage at 4 mA sink current. It supports TTL/DTL/ECL/MOS/CMOS logic interfacing and operates across -40 °C to +105 °C, commonly used in zero-crossing detection, limit comparators, and transducer signal conditioning.
For engineers reviewing the LM293D datasheet, LM293D pinout, LM293D application, or LM293D equivalent, key selection criteria include input common-mode range extending to ground, low supply current (0.45 mA at 5 V), differential input voltage tolerance up to ±36 V, and compatibility with MiniSO8, SO8, TSSOP8, and DFN8 2×2 packages.
Technical Context
The LM293D integrates two independent PNP-input comparators with rail-to-rail input common-mode range down to ground on single supply, enabling direct sensing of signals referenced to system ground without level-shifting. Its open-collector outputs support wired-OR configurations and interface directly with 5 V TTL or 3.3 V CMOS logic when pulled up externally.
It delivers 1.3 μs typical response time with 100 mV input step and 5 mV overdrive, and maintains stable operation across supply voltages from 2 V to 36 V while consuming only 1 mW per comparator at 5 V - critical for battery-powered and energy-conscious industrial control designs.
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 - enables use in 3.3 V, 5 V, 12 V, and 24 V systems without level translation. |
| Input Offset Voltage | ±1 mV typ. - ensures accurate threshold detection in precision window or zero-crossing applications. |
| Input Bias Current | 20 nA typ. - minimizes loading on high-impedance sensor sources like thermistors or magnetic pickups. |
| Output Sink Current | 6 mA min. at Vo = 1.5 V - sufficient to drive LEDs, small relays, or logic inputs directly. |
| Response Time | 1.3 μs typ. (100 mV step, 5 mV overdrive) - suitable for sub-MHz signal monitoring and basic PWM generation. |
| Operating Temperature | -40 °C to +105 °C - qualified for industrial automation, motor control, and automotive under-hood auxiliary circuits. |
| ESD Robustness | Not specified for LM293D (LM393W variant offers 2 kV HBM) - standard industrial-grade ESD protection per JEDEC JESD22-A114. |
Pinout & Package
LM293D is available in SO8 (Small Outline Integrated Circuit, 150 mil width), with 1.27 mm lead pitch and standard JEDEC MS-012AC footprint. The package supports reflow soldering and is RoHS-compliant per ST's ECOPACK2 specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OUT1 | Open-collector output of comparator 1 - requires external pull-up to define logic HIGH level and sink current path. |
| 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 voltage can exceed supply rails by ±36 V. |
| 4 | VCC− | Negative supply terminal (GND in single-supply mode) - must be connected even in single-rail configuration. |
| 5 | IN2+ | Non-inverting input of comparator 2 - electrically isolated from comparator 1; supports independent signal paths. |
| 6 | IN2− | Inverting input of comparator 2 - used for differential sensing or reference comparison in second channel. |
| 7 | OUT2 | Open-collector output of comparator 2 - independently controllable; supports wired-OR with OUT1 if needed. |
| 8 | VCC+ | Positive supply terminal - supplies both comparators; total supply current remains ~0.45 mA at 5 V regardless of load. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | Pull-down to GND capability on IN+ and IN− enables direct interface with 0 V–referenced sensors (e.g., thermocouples, resistive bridges). |
| Wide supply flexibility | Operates from 2 V (battery-low warning) to 36 V (industrial PLC I/O) without external regulators or level shifters. |
| Low quiescent power | 0.45 mA supply current at 5 V translates to <1 mW per comparator - extends battery life in portable instrumentation. |
| Logic-compatible outputs | Open-collector outputs simplify interface to 3.3 V, 5 V, or 12 V logic families via single pull-up resistor per channel. |
| High differential input tolerance | ±36 V differential rating allows safe operation with fast transient inputs (e.g., motor back-EMF, relay coil spikes). |
Applications
| Zero-Crossing Detection | Limit Comparator |
|---|---|
|
Use Scenario: Monitoring AC mains waveform to trigger TRIAC firing or synchronize digital sampling. IC Role / Device Role / Timing Role: Dual comparator configured as precision zero-cross detector with hysteresis; one channel detects rising edge, the other falling edge. Use Value: Input common-mode range including ground eliminates need for AC coupling capacitors or bias networks in single-supply designs. |
Use Scenario: Detecting when a sensor output exceeds upper or lower thresholds (e.g., temperature alarm, pressure safety cutoff). IC Role / Device Role / Timing Role: Two independent comparators compare sensor voltage against fixed high/low reference voltages. Use Value: Low input offset (±1 mV) ensures tight threshold accuracy; open-collector outputs allow direct OR-ing of alarm conditions. |
| Transducer Signal Conditioning | Crystal-Controlled Comparator |
|
Use Scenario: Amplifying and digitizing low-level signals from magnetic pickups, strain gauges, or photodiodes. IC Role / Device Role / Timing Role: Comparator converts analog transducer output into clean digital pulses for microcontroller input or counter circuits. Use Value: 20 nA input bias current prevents loading of high-Z transducer sources; rail-to-ground input range preserves signal integrity. |
Use Scenario: Building simple frequency discriminators or clock-edge detectors using crystal oscillator outputs. IC Role / Device Role / Timing Role: One comparator compares crystal sine wave against internal reference to generate square-wave clock output. Use Value: 1.3 μs response time supports reliable digitization of 100 kHz crystal signals; differential input rejects common-mode noise. |
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 |
|---|---|---|---|
| LM393D | Same architecture but rated for 0 °C to +70 °C industrial grade; identical electrical specs except wider temp range for LM293D. | Not suitable for extended-temperature environments like motor drives or outdoor controllers where -40 °C startup is required. | Select LM293D when operating ambient exceeds 70 °C or drops below 0 °C; otherwise LM393D offers cost parity for commercial-grade designs. |
| TLV3702IDR | Rail-to-rail input/output, 1.8 V to 16 V supply, 350 nA supply current, but only 1.5 V minimum supply - lacks 2 V low-end capability of LM293D. | Better for ultra-low-power 3.3 V systems; incompatible with 24 V industrial buses or legacy 5 V/12 V designs requiring wide supply range. | Choose TLV3702IDR only when supply is strictly ≤16 V and sub-μA quiescent current is mandatory; LM293D remains superior for multi-rail compatibility. |
Compared with LM393D and TLV3702IDR, the LM293D uniquely balances extended temperature operation (-40 °C to +105 °C), 2 V–36 V supply flexibility, and proven robustness in noisy industrial environments - making it the preferred choice for legacy-compatible and ruggedized embedded sensing.
Availability
LM293D is available at Aetrix Electronics and suitable for industrial motor control, programmable logic controller (PLC) I/O modules, and battery-powered test equipment requiring stable component supply across extended temperature ranges and diverse voltage rails.
Supply support for LM293D 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, power management, and microcontroller markets since 1987.
The LM293 series belongs to ST's precision analog comparators product line, engineered for reliability in harsh industrial environments and backward compatibility with legacy LM393-based designs while extending temperature and supply range.
FAQ
Can LM293D operate from a single 3.3 V supply?
Yes. The LM293D supports single-supply operation from 2 V to 36 V, so 3.3 V is fully within specification. Its input common-mode range includes ground, and output saturation voltage is only 80 mV at 4 mA sink - enabling clean logic-level transitions when paired with a 3.3 V pull-up resistor.
Does LM293D require external pull-up resistors on its outputs?
Yes. Both outputs are open-collector, meaning they can only sink current. An external pull-up resistor to VCC+ (or another logic rail) is mandatory to establish a defined HIGH state. Typical values range from 2.2 kΩ (for faster rise time) to 10 kΩ (for lower power) depending on load capacitance and speed requirements.
What is the maximum differential input voltage the LM293D can tolerate?
The LM293D supports ±36 V differential input voltage - meaning the voltage difference between IN+ and IN− can safely reach 72 V peak-to-peak. This exceeds the supply rails and protects against inductive kickback or ESD transients without clamping diodes or external protection.
Is LM293D pin-compatible with LM393D?
Yes. Both devices share identical SO8 pinout, electrical characteristics, and functional behavior. The LM293D substitutes directly for LM393D in existing layouts, offering extended temperature range (-40 °C to +105 °C vs. 0 °C to +70 °C) without any circuit modification.
LM293D 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, 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-SOIC
LM293D FAQ
1.How can I place an order for LM293D through Aetrix?
Please submit a Request for Quotation (RFQ) for LM293D 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 LM293D reliable?
The price and inventory of LM293D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM293D is usually 5 days.
3.What payment methods are accepted for LM293D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM293D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM293D?
LM293D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM293D 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 LM293D?
For technical support, including LM293D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM293D requirements.
6.How does Aetrix verify that LM293D is sourced from the original manufacturer or authorized distributors?
All LM293D 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 LM293D meets industry standards.
7.What is the process for return or replacement of LM293D?
All LM293D units undergo pre-shipment inspection (PSI). If there is an issue with LM293D, 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 LM293D part is unused and in its original packaging.
Return procedure for LM293D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM293D Tags
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