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Texas Instruments LM293P
- Part No.:
- LM293P
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
LM293P.pdf
- Description:
- IC COMPARATOR 2 DIFF 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:6,487
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Product details
Overview
LM293P from Texas Instruments is a dual voltage comparator designed for single-supply operation across 2 V to 30 V, featuring ±9 mV max input offset voltage, 1.3 µs typical response time, and rail-to-rail common-mode input range down to ground-used in motor drive feedback, power supply monitoring, and appliance control circuits.
For engineers reviewing the LM293P datasheet, LM293P pinout, LM293P application, or LM293P equivalent, this page delivers verified electrical specs, package mapping (PDIP-8), functional pin roles, real-world use cases, and two validated alternative parts with documented technical and application differences.
Technical Context
The LM293P implements open-collector output architecture with independent dual comparators, enabling flexible pull-up configuration and direct interfacing with TTL, MOS, and CMOS logic families. Its input stage supports common-mode voltages from ground to VCC − 2 V, and differential input range up to ±30 V.
Quiescent current remains stable across supply voltage (0.45–2.5 mA at 5 V to 30 V), and output sinking capability reaches 6 mA minimum at 1.5 V saturation-critical for driving LEDs, relays, or logic inputs without external buffers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2 V to 30 V - enables direct integration into 3.3 V, 5 V, 12 V, and 24 V industrial power rails without level-shifting. |
| Input Offset Voltage (max) | ±9 mV over full temperature range - ensures reliable threshold detection in precision level-sensing applications like battery voltage monitoring. |
| Response Time (typ) | 1.3 µs at 100 mV overdrive - supports fast edge detection in motor commutation or overvoltage shutdown circuits. |
| Input Bias Current (max) | −400 nA - minimizes loading on high-impedance sensor sources such as thermistors or photodiodes. |
| Output Sink Current (min) | 6 mA at VOL = 1.5 V - sufficient to directly drive indicator LEDs or small-signal relays without external transistor stages. |
| Common-Mode Input Range | 0 V to VCC − 2 V - allows direct sensing of signals referenced to ground, including battery terminals and shunt-based current measurements. |
| ESD Rating (HBM) | 2000 V - meets standard industrial handling requirements without additional input protection circuitry. |
Pinout & Package
LM293P is supplied in an 8-pin PDIP package (9.81 mm × 6.35 mm), optimized for through-hole prototyping and legacy industrial PCBs. The package includes internal thermal design compatible with standard wave-soldering profiles.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1OUT | Comparator 1 output | Open-collector node requiring external pull-up; sinks current when IN+ > IN−, floats otherwise. |
| 1IN− | Comparator 1 inverting input | Accepts reference or feedback signal; supports common-mode down to ground. |
| 1IN+ | Comparator 1 non-inverting input | Accepts sensed signal; differential voltage up to ±30 V tolerated without damage. |
| GND | Ground reference | Return path for both comparators and output loads; must be low-impedance for stable operation. |
| 2IN+ | Comparator 2 non-inverting input | Independent input channel; identical electrical characteristics to Pin 3. |
| 2IN− | Comparator 2 inverting input | Supports separate reference setup; no crosstalk with Channel 1 per datasheet testing. |
| 2OUT | Comparator 2 output | Functionally identical to Pin 1; enables dual-threshold or redundant monitoring schemes. |
| VCC | Positive supply | Single power rail for both comparators; quiescent current independent of VCC value. |
Key Features
| Feature | Design Value |
|---|---|
| Rail-to-ground input range | Enables direct sensing of 0 V-referenced signals (e.g., battery negative terminal, shunt resistor low side) without level shifters. |
| Open-collector outputs | Allows wired-OR logic, mixed-voltage interfacing (e.g., 5 V comparator driving 3.3 V MCU interrupt), and simplified LED/relay drive. |
| Wide supply range (2–30 V) | Eliminates need for dedicated LDOs in multi-rail systems-operates natively from 3.3 V microcontroller supplies or 24 V PLC backplanes. |
| Low input bias current (−400 nA max) | Preserves accuracy in high-impedance divider networks used for voltage scaling in battery fuel gauging or sensor conditioning. |
| Stable quiescent current vs. VCC | Ensures predictable power budgeting across variable input voltages-critical for energy-constrained UPS or portable tool designs. |
Applications
| Motor Drive Feedback | Server PSU Monitoring |
|---|---|
|
Use Scenario: Detect rotor position zero-crossing in BLDC motor controllers using back-EMF sensing. IC Role / Device Role / Timing Role: Dual comparator compares phase voltage against mid-rail reference to generate commutation timing edges. Use Value: 1.3 µs propagation delay ensures sub-microsecond timing resolution for 20 kHz+ PWM frequencies without jitter-induced torque ripple. |
Use Scenario: Monitor +12 V and +5 V rails in ATX server power supplies for overvoltage and undervoltage lockout. IC Role / Device Role / Timing Role: Independent channels compare each rail against precision references to assert fault signals. Use Value: ±9 mV offset tolerance guarantees trip thresholds remain within ±0.1% of nominal rail values across temperature, preventing false shutdowns. |
| Appliance Safety Interlock | Factory Automation Sensor Interface |
|
Use Scenario: Validate door latch closure and temperature cutoff in microwave ovens before magnetron activation. IC Role / Device Role / Timing Role: One comparator monitors microswitch state; second monitors NTC thermistor voltage divider. Use Value: Rail-to-ground input range allows direct connection to grounded thermal sensors and mechanical switches-no biasing resistors required. |
Use Scenario: Convert analog 4–20 mA current loop signals from pressure transmitters into digital ON/OFF control for pneumatic valves. IC Role / Device Role / Timing Role: Comparator compares scaled loop voltage against programmable thresholds to trigger PLC inputs. Use Value: 6 mA sink capability drives standard 24 V PLC optocoupler inputs directly-no external transistor or driver IC needed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393P | Identical pinout and electrical specs, but rated for 0°C to 70°C (vs. LM293P's –25°C to 85°C); lower ESD robustness (2 kV HBM same, but less ruggedized input clamps). | Suitable for commercial-grade consumer electronics; not recommended for automotive under-hood or industrial ambient above 70°C. | Select LM393P only if operating temperature stays within 0–70°C and cost is primary constraint. |
| LM2903P | Same package and pinout; wider temp range (–40°C to 125°C); improved input offset (±7 mV max); higher supply voltage (up to 32 V). | Preferred for automotive engine control modules and industrial motor drives requiring extended temperature and voltage margins. | Choose LM2903P when ambient exceeds 85°C or supply may reach 32 V-no PCB changes needed due to pin compatibility. |
Compared with LM393P and LM2903P, the LM293P uniquely balances extended industrial temperature support (–25°C to 85°C) with legacy PDIP availability and proven reliability in white-goods control boards-making it optimal for cost-sensitive, thermally moderate applications where LM2903P's automotive-grade specs are unnecessary.
Availability
LM293P is available at Aetrix Electronics and suitable for motor drive feedback, server PSU monitoring, and appliance safety interlock applications requiring stable component supply, long-term obsolescence management, and traceable sourcing from authorized channels.
Supply support for LM293P 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
Texas Instruments is a global semiconductor leader specializing in analog and embedded processing technologies, with decades of expertise in precision signal conditioning and power management ICs.
The LM293P belongs to TI's industry-standard dual comparator family, engineered for robust performance in cost-sensitive industrial controls, home appliances, and power conversion systems where reliability and ease of use are critical.
FAQ
What is the maximum supply voltage rating for LM293P?
The LM293P supports a maximum supply voltage of 30 V, as specified in its Absolute Maximum Ratings table. This allows direct operation from common industrial rails including 24 V DC systems. Exceeding 30 V risks permanent device damage, and operation above 30 V is not guaranteed-even briefly during transients-so appropriate clamping or regulation is required in high-voltage environments.
Does LM293P support rail-to-rail input common-mode range?
The LM293P supports a common-mode input voltage range from ground (0 V) to VCC − 2 V, meaning it does not achieve true rail-to-rail input but does include ground-enabling direct sensing of low-side shunt resistors or battery negatives. Neither input may go below −0.3 V, and exceeding VCC − 2 V on either input degrades accuracy or causes incorrect output states.
Can LM293P drive a 5 V logic input directly?
Yes, LM293P can drive a 5 V logic input directly using an external pull-up resistor (e.g., 10 kΩ to 5 V). Its open-collector output pulls low to ≤400 mV at 4 mA sink, satisfying TTL and most CMOS VIH/VIL thresholds. No level-shifter is needed, though pull-up placement must avoid noise coupling in mixed-signal layouts.
What is the typical propagation delay of LM293P?
The LM293P exhibits a typical propagation delay of 1.3 µs under standard test conditions (100 mV input overdrive, 5 V supply, 15 pF load). Delay varies with overdrive voltage and supply-dropping to ~0.3 µs for TTL-level steps-and remains stable across its –25°C to +85°C operating range per datasheet characterization.
Is LM293P pin-compatible with LM393P?
Yes, LM293P is fully pin-compatible with LM393P in PDIP-8 packaging: identical pin numbering, function mapping, and footprint. Both share the same SOIC, VSSOP, and TSSOP variants. However, LM293P offers extended temperature range (–25°C to 85°C vs. 0°C to 70°C) and slightly tighter input offset spec (±9 mV vs. ±9 mV typical, same max), making it a drop-in upgrade for many legacy LM393P designs.
LM293P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Bulk
- 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):
- 20mA
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- -25°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 8-PDIP
LM293P FAQ
1.How can I place an order for LM293P through Aetrix?
Please submit a Request for Quotation (RFQ) for LM293P 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 LM293P reliable?
The price and inventory of LM293P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM293P is usually 5 days.
3.What payment methods are accepted for LM293P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM293P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM293P?
LM293P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM293P 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 LM293P?
For technical support, including LM293P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM293P requirements.
6.How does Aetrix verify that LM293P is sourced from the original manufacturer or authorized distributors?
All LM293P 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 LM293P meets industry standards.
7.What is the process for return or replacement of LM293P?
All LM293P units undergo pre-shipment inspection (PSI). If there is an issue with LM293P, 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 LM293P part is unused and in its original packaging.
Return procedure for LM293P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM293P Tags
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LM2903DR
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LM339DR
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LM393DT
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LM2901PWR
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LM2903DT
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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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