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Texas Instruments LM293H
- Part No.:
- LM293H
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- TO-99-8 Metal Can
- Datasheet:
-
LM293H.pdf
- Description:
- IC COMPARATOR 2 GEN PUR TO99-8
- Quantity:
- Payment:
- Shipping:
Inventory:4,504
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Product details
Overview
LM293H from Texas Instruments is a dual, low-power, precision voltage comparator IC with open-collector outputs, designed for single-supply operation from 2.0 V to 36 V or dual supplies (±1.0 V to ±18 V). It features ±3 mV maximum input offset voltage, 25 nA typical input bias current, and 0.4 mA supply current at 5 V - enabling battery-powered sensing and industrial threshold detection.
For engineers reviewing the LM293H datasheet, LM293H pinout, LM293H application, or LM293H equivalent, key selection criteria include its ground-sensing capability (input common-mode range includes 0 V), TTL/CMOS-compatible output stage, low quiescent current, wide supply tolerance, and SOIC-8 packaging suitable for space-constrained industrial control and power management designs.
Technical Context
The LM293H implements two independent PNP-input comparators with open-collector NPN output stages, allowing wired-OR configurations and flexible pull-up voltage selection up to 36 V. Its input stage enables operation with inputs referenced to ground even under single-supply conditions, eliminating need for level-shifting circuitry.
Each comparator delivers 6–16 mA sink capability with ≤400 mV saturation voltage at 4 mA load, and supports differential input voltages up to 36 V without damage. The device operates across −25°C to +85°C junction temperature, matching industrial ambient requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0 V to 36 V single supply; ±1.0 V to ±18 V dual supply - supports wide-input industrial rails and battery systems down to 2 V. |
| Input Offset Voltage | ±3 mV max - ensures accurate threshold detection in precision limit-comparator and zero-crossing applications. |
| Supply Current | 0.4 mA typ at 5 V - enables multi-year operation in coin-cell–powered monitoring devices. |
| Input Bias Current | 25 nA typ - permits use with high-impedance sensor nodes (e.g., thermistors, photodiodes) without loading error. |
| Output Saturation Voltage | 250 mV max at 4 mA - guarantees reliable logic-low assertion for TTL/CMOS interface with minimal voltage headroom. |
| Input Common-Mode Range | Includes ground (0 V) - allows direct sensing of signals referenced to system ground under single-supply operation. |
| Response Time | 1.3 μs typ - sufficient for motor overcurrent protection, power-supply sequencing, and medium-speed pulse generation. |
Pinout & Package
LM293H is housed in an 8-pin SOIC package (4.90 mm × 3.91 mm body size), compatible with standard surface-mount assembly processes and IPC-7351B footprint IPC7351SOIC8_490X391_P127M.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA (Pin 1) | Open-collector output, Channel A | Sinks current to GND; requires external pull-up to define HIGH logic level - enables voltage-level translation and wired-OR logic. |
| −INA (Pin 2) | Inverting input, Channel A | Accepts reference or threshold voltage; input bias current flows *out* of pin due to PNP input stage. |
| +INA (Pin 3) | Non-inverting input, Channel A | Accepts sensed signal; common-mode range extends to GND, enabling direct ground-referenced monitoring. |
| GND (Pin 4) | Ground reference | Return path for supply and output loads; serves as V− when used in dual-supply mode. |
| +INB (Pin 5) | Non-inverting input, Channel B | Independent second sensing channel; identical electrical characteristics to Channel A. |
| −INB (Pin 6) | Inverting input, Channel B | Second reference input; supports dual-threshold or window-comparator topologies. |
| OUTB (Pin 7) | Open-collector output, Channel B | Electrically isolated from OUTA; supports independent logic interfacing or OR'ing with external components. |
| V+ (Pin 8) | Positive supply rail | Accepts 2.0–36 V; supply current independent of voltage magnitude - simplifies design across varying input rails. |
Key Features
| Feature | Design Value |
|---|---|
| Ground-sensing input stage | Input common-mode range includes 0 V - eliminates need for negative supply or level-shifting in single-rail systems. |
| Open-collector outputs | Supports wired-OR logic, mixed-voltage interfacing (e.g., 3.3 V logic driving 12 V load), and flexible pull-up selection. |
| Low input bias current (25 nA) | Minimizes loading on high-impedance sources like RTDs, capacitive sensors, or voltage dividers with >100 kΩ resistors. |
| Wide supply range (2–36 V) | Enables reuse across 3.3 V microcontroller I/O, 5 V logic, 12 V automotive, and 24 V industrial control subsystems. |
| Low quiescent current (0.4 mA) | Reduces standby power in always-on monitoring circuits - critical for battery-backed smoke detectors and IoT edge nodes. |
Applications
| Battery-Powered Threshold Detection | Industrial Overvoltage Protection |
|---|---|
|
Use Scenario: Monitoring Li-ion cell voltage during charging to trigger cutoff at 4.2 V. IC Role / Device Role / Timing Role: Dual comparator configured as precision window detector - one channel for upper limit, one for lower limit. Use Value: ±3 mV offset ensures <±0.1% voltage accuracy at 4.2 V, preventing overcharge while maximizing usable capacity. |
Use Scenario: Detecting 28 V rail overvoltage in 24 V industrial PLC backplane. IC Role / Device Role / Timing Role: Single-channel comparator comparing rail voltage against 27.5 V reference. Use Value: 36 V absolute max input rating allows direct connection without attenuation; 1.3 μs response enables fast shutdown before downstream damage. |
| Zero-Crossing Detection (Single Supply) | Logic-Level Translation Interface |
|
Use Scenario: Converting 120 VAC line signal to clean 3.3 V digital zero-cross pulses for microcontroller timing. IC Role / Device Role / Timing Role: Comparator with resistor divider and hysteresis, referenced to GND under 5 V single supply. Use Value: Input common-mode range including ground allows direct AC coupling via capacitor and bias network - no negative supply required. |
Use Scenario: Interfacing 5 V microcontroller GPIO to 12 V relay driver logic. IC Role / Device Role / Timing Role: Open-collector output pulled to 12 V, driven by 3.3 V or 5 V MCU signal via resistor divider. Use Value: Output compatible with TTL/CMOS and capable of sinking 16 mA - directly drives optocoupler LED or small relay coil without buffer transistor. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual open-collector comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Same architecture and pinout; wider commercial temp range (0°C to +70°C) vs. LM293H's −25°C to +85°C. | Limited to consumer-grade environments; not rated for extended industrial temperature operation. | Select LM393DR only if ambient temperature remains within 0–70°C and cost is primary constraint. |
| LM2903DT | Identical electrical specs and SOIC-8 package; qualified for −40°C to +125°C, with enhanced ESD (±2000 V HBM). | Approved for automotive and harsh industrial use; higher reliability screening per AEC-Q100 Grade 2. | Choose LM2903DT when operating in automotive engine bays or outdoor enclosures requiring extended thermal margin and robustness. |
Compared with LM293H, LM393DR offers lower cost but reduced temperature capability, while LM2903DT provides broader qualification and higher ESD immunity at modest premium - making LM293H the optimal balance for general-purpose industrial control where −25°C to +85°C suffices.
Availability
LM293H is available at Aetrix Electronics and suitable for industrial control systems, battery management units, and power supply monitoring applications requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM293H 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 delivering analog, embedded processing, and connectivity solutions with emphasis on reliability, longevity, and industrial-grade qualification.
The LMx93 family - including LM293H - was engineered for precision analog comparison in resource-constrained, single-supply industrial and instrumentation systems where ground-referenced sensing and low power are essential.
FAQ
What is the operating temperature range for LM293H?
The LM293H is specified for operation from −25°C to +85°C junction temperature. This range supports deployment in industrial control cabinets, factory automation equipment, and outdoor power electronics where ambient temperatures exceed consumer-grade limits but do not reach automotive extremes. The LM293H datasheet confirms this range under Recommended Operating Conditions, distinct from the LM393 (0°C to +70°C) and LM2903 (−40°C to +85°C).
Does LM293H require dual power supplies to function?
No, LM293H operates fully from a single supply between 2.0 V and 36 V. Its input common-mode voltage range includes ground (0 V), enabling direct sensing of signals referenced to system ground without negative supply rails. Dual-supply operation (±1.0 V to ±18 V) is supported but optional - the device is optimized for single-rail industrial and battery-powered applications.
Can LM293H drive TTL and CMOS logic directly?
Yes, LM293H outputs are compatible with TTL, DTL, ECL, MOS, and CMOS logic families. Its open-collector outputs sink up to 16 mA and saturate to ≤400 mV at 4 mA, ensuring solid LOW-level assertion. An external pull-up resistor to the target logic supply (e.g., 3.3 V or 5 V) completes the interface - no level-shifting IC is needed.
What is the maximum input voltage allowed on LM293H pins?
The absolute maximum differential input voltage is 36 V, and individual input pins tolerate −0.3 V to +36 V relative to GND. Inputs may exceed V+ without damage, provided the other input remains within the common-mode range (0 V to V+−1.5 V). However, input voltage must not go below −0.3 V to avoid forward-biasing internal clamping diodes.
Is LM293H pin-compatible with LM393 or LM2903?
Yes, LM293H shares identical SOIC-8 pinout and electrical functionality with LM393 and LM2903. All three devices use the same Pin Functions table (OUTA, −INA, +INA, GND, +INB, −INB, OUTB, V+), enabling drop-in replacement in existing PCB layouts - though temperature range, offset voltage distribution, and qualification differ per variant.
LM293H Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- TO-99-8 Metal Can
- Series:
- -
- Packaging:
- Bulk
- 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):
- 16mA @ 5V
- Current - Output (Typ):
- 2.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- 700ns
- Propagation Delay (Max):
- -
- Hysteresis:
- -25°C ~ 85°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- TO-99-8
LM293H FAQ
1.How can I place an order for LM293H through Aetrix?
Please submit a Request for Quotation (RFQ) for LM293H 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 LM293H reliable?
The price and inventory of LM293H are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM293H is usually 5 days.
3.What payment methods are accepted for LM293H?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM293H transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM293H?
LM293H orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM293H 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 LM293H?
For technical support, including LM293H datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM293H requirements.
6.How does Aetrix verify that LM293H is sourced from the original manufacturer or authorized distributors?
All LM293H 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 LM293H meets industry standards.
7.What is the process for return or replacement of LM293H?
All LM293H units undergo pre-shipment inspection (PSI). If there is an issue with LM293H, 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 LM293H part is unused and in its original packaging.
Return procedure for LM293H:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM293H Tags
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LM393DT
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LM2903DT
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LM239DR
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