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Texas Instruments LM293AD
- Part No.:
- LM293AD
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM293AD.pdf
- Description:
- IC COMPARATOR 2 DIFF 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:5,269
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Product details
Overview
LM293AD from STMicroelectronics is a dual low-power voltage comparator IC designed for single-supply operation from +2V to +36V or split supplies ±1V to ±18V, featuring rail-to-rail input common-mode range including ground, ±1mV typical input offset voltage, and 250mV typical output saturation voltage at 4mA sink current-used in precision threshold detection and transducer signal conditioning in industrial sensor interfaces.
For engineers reviewing the LM293AD datasheet, LM293AD pinout, LM293AD application, or LM293AD equivalent, key selection criteria include input offset voltage stability over temperature, output drive capability into TTL/CMOS loads, supply current efficiency at low voltages, and compatibility with ground-referenced input signals in single-supply systems.
Technical Context
The LM293AD implements two independent open-collector comparators with PNP input stages enabling input common-mode voltage down to ground on single supply-critical for zero-crossing and level-shifting applications. Its differential input voltage range equals the full supply voltage (±36V), supporting robust input overvoltage tolerance without damage.
Output stage design delivers 6mA minimum sink current with 250mV saturation voltage at 4mA, ensuring reliable interfacing with TTL, DTL, ECL, MOS, and CMOS logic families. Supply current remains constant at 0.4mA typ. across the entire 2V–36V supply range, enabling ultra-low-power operation in battery-backed monitoring circuits.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +2V to +36V (single) or ±1V to ±18V (dual)-supports wide-input industrial power rails and legacy 5V/12V/24V systems |
| Input Offset Voltage | ±1mV typ.-enables accurate 10mV-level threshold detection without external trimming |
| Input Bias Current | 25nA typ.-minimizes loading on high-impedance sources like thermistors or photodiodes |
| Output Sink Current | 6mA min. at VO = 1.5V-drives standard TTL inputs directly and supports pull-up to 5V/3.3V/15V logic |
| Response Time | 1.3µs typ. (100mV overdrive)-sufficient for <100kHz window-compare and zero-crossing detection |
| Quiescent Current | 0.4mA typ. at +5V-delivers 1mW per comparator, ideal for always-on sensor wake-up circuits |
| Common-Mode Range | 0V to VCC+ −1.5V-allows ground-referenced inputs even on +5V single supply |
Pinout & Package
LM293AD is packaged in SO-8 (Plastic Micropackage), with 1.27mm pitch, gull-wing leads, and JEDEC MS-012AC compliant outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 1 | Open-collector NPN output-requires external pull-up; sinks up to 6mA |
| 2 | Inverting Input 1 | PNP-base input node-accepts voltages from ground to VCC−1.5V |
| 3 | Non-inverting Input 1 | PNP-base input node-identical common-mode range as Pin 2 |
| 4 | VCC− | Negative supply terminal-connect to ground in single-supply mode |
| 5 | Non-inverting Input 2 | Second comparator positive input-fully independent of Channel 1 |
| 6 | Inverting Input 2 | Second comparator negative input-supports separate reference or signal path |
| 7 | Output 2 | Open-collector NPN output-electrically isolated from Output 1 |
| 8 | VCC+ | Positive supply terminal-accepts +2V to +36V; powers both comparators |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | Input common-mode range includes 0V on single supply-eliminates need for negative rail in level-shifted sensor interfaces |
| Supply-independent quiescent current | 0.4mA typ. across +2V to +36V-ensures predictable power budget in variable-voltage systems |
| Wide differential input voltage tolerance | ±36V max.-permits direct connection to unconditioned transducer outputs without clamping diodes |
| Low-output saturation voltage | 250mV typ. at 4mA sink-reduces logic-high voltage error when driving 5V TTL with 1kΩ pull-up |
| Temperature-stable offset performance | ±1mV typ. at +25°C, ≤±4mV over −40°C to +105°C-supports factory-calibrated thresholds without drift compensation |
Applications
| Transducer Signal Conditioning | Zero-Crossing Detection |
|---|---|
Use Scenario: Amplifying and comparing low-level analog outputs from RTDs, thermocouples, or strain gauges referenced to system ground. IC Role / Device Role / Timing Role: Dual comparator provides differential thresholding and hysteresis control for analog-to-digital event triggering. Use Value: Ground-referenced inputs eliminate level-shifting circuitry; 25nA bias current prevents measurement error in µA-range sensor bridges. | Use Scenario: Detecting AC waveform polarity transitions in motor control feedback or AC mains monitoring. IC Role / Device Role / Timing Role: Comparator compares sinusoidal input against 0V reference to generate clean digital edge on each crossing. Use Value: Input common-mode range including ground enables direct connection to transformer-coupled or capacitive-coupled AC signals without DC bias. |
| Lamp/LED On-Off Control | Window Comparator for Battery Monitoring |
Use Scenario: Turning on indicator lamps or status LEDs when sensed voltage exceeds a preset threshold. IC Role / Device Role / Timing Role: Single comparator channel drives NPN transistor switch via open-collector output. Use Value: 6mA sink current directly biases base of 2N2222-type transistors; 250mV saturation ensures ≥4.75V logic-high margin with 5V pull-up. | Use Scenario: Monitoring lithium-ion cell voltage to trigger under-voltage lockout or over-voltage protection. IC Role / Device Role / Timing Role: Two comparators form high/low threshold pair detecting if voltage falls outside safe 3.0V–4.2V window. Use Value: Independent channels allow precise, matched-offset window detection; ±1mV offset minimizes false trips near trip points. |
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 | Same architecture but rated for 0°C to +70°C; ±2mV max input offset vs. ±4mV for LM293AD over full temp range | Not qualified for industrial temperature range (−40°C to +105°C) | Select when ambient operating temperature stays within commercial range and cost sensitivity outweighs extended temp qualification |
| TLV3702IDR | Rail-to-rail input/output; 65µA supply current; 360ns response time; requires ≥1.8V supply | Higher speed and lower power, but incompatible with <1.8V supplies and lacks ground-sensing input on older designs | Select for battery-powered portable equipment needing microamp quiescent current and faster response, accepting revised input range constraints |
Compared with LM393DR and TLV3702IDR, the LM293AD uniquely balances industrial temperature rating, ground-referenced input capability, and proven robustness in 24V industrial I/O modules-making it preferred where legacy compatibility, wide supply flexibility, and reliability across harsh thermal environments are mandatory.
Availability
LM293AD is available at Aetrix Electronics and suitable for industrial sensor interfaces, AC zero-crossing detection, lamp/LED control circuits, and battery voltage window monitoring requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for LM293AD 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 automotive, industrial, and power management solutions with vertical manufacturing and broad analog/mixed-signal IP.
The LM293AD belongs to ST's legacy precision analog comparator family-designed specifically for robust, low-cost threshold detection in industrial automation, power supply supervision, and sensor interface modules where reliability across wide voltage and temperature ranges is critical.
FAQ
Can LM293AD operate with a single 3.3V supply?
Yes. The LM293AD supports single-supply operation from +2V to +36V, including 3.3V. Its input common-mode range extends to ground, and output can sink current into a 3.3V pull-up resistor. At 3.3V, typical supply current remains 0.4mA, and output saturation voltage is ≤350mV at 4mA load-ensuring compatible logic levels with 3.3V CMOS.
Does LM293AD require external hysteresis resistors?
No, hysteresis is not built-in, but external positive feedback is straightforward: connect a resistor from Output 1 to Non-inverting Input 1. With a 100kΩ feedback and 1MΩ input resistor, hysteresis width is ~10mV at room temperature. This configuration maintains stability while preserving the comparator's ground-sensing capability and low offset performance.
What is the maximum sink current for LM293AD outputs?
The LM293AD outputs are rated for 6mA minimum sink current at VO = 1.5V (per channel), with absolute maximum rating of 20mA. Sustained operation above 6mA increases saturation voltage-e.g., 700mV at 16mA-and may exceed thermal limits in SO-8 package above 10mA continuous. For >10mA loads, add a discrete NPN buffer stage.
Is LM293AD pin-compatible with LM393?
Yes-LM293AD and LM393 share identical SO-8, DIP-8, TSSOP-8, and Mini-SO-8 pinouts and electrical behavior. However, LM293AD is specified for −40°C to +105°C operation, while LM393 is rated 0°C to +70°C. Substituting LM293AD into LM393 designs adds industrial temperature resilience without layout or schematic changes.
LM293AD Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Open-Drain, Rail-to-Rail
- Voltage - Supply, Single/Dual (±):
- 2V ~ 36V, ±1V ~ 18V
- :
- 2mV @ 30V
- Voltage - Input Offset (Max):
- 0.25µA @ 5V
- Current - Input Bias (Max):
- 20mA
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -25°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 8-SOIC
LM293AD FAQ
1.How can I place an order for LM293AD through Aetrix?
Please submit a Request for Quotation (RFQ) for LM293AD 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 LM293AD reliable?
The price and inventory of LM293AD are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM293AD is usually 5 days.
3.What payment methods are accepted for LM293AD?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM293AD transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM293AD?
LM293AD orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM293AD 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 LM293AD?
For technical support, including LM293AD datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM293AD requirements.
6.How does Aetrix verify that LM293AD is sourced from the original manufacturer or authorized distributors?
All LM293AD 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 LM293AD meets industry standards.
7.What is the process for return or replacement of LM293AD?
All LM293AD units undergo pre-shipment inspection (PSI). If there is an issue with LM293AD, 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 LM293AD part is unused and in its original packaging.
Return procedure for LM293AD:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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