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Texas Instruments LM319AMX
- Part No.:
- LM319AMX
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM319AMX.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,197
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Product details
Overview
LM319AMX from Texas Instruments is a precision high-speed dual comparator IC designed for logic-level supply operation and industrial signal conditioning. It features 80-ns response time at ±15 V, 0.5–2 mV input offset voltage (max), and uncommitted open-collector outputs capable of sinking 25 mA - enabling direct relay or TTL/DTL/RTL interface in power control circuits.
For engineers reviewing the LM319AMX datasheet, LM319AMX pinout, LM319AMX application, or LM319AMX equivalent, this page delivers verified electrical specs, SOIC-14 package mapping, real-world timing performance, and validated alternative comparators for high-speed threshold detection designs.
Technical Context
The LM319AMX implements two independent high-gain comparators on a single monolithic die with rail-to-rail input common-mode range up to ±13 V at ±15 V supplies and 1–3 V at 5-V single supply. Its uncommitted NPN output stage supports flexible pull-up configurations and direct drive of lamps, relays, or logic families without external level-shifting.
It operates across 0°C to +70°C and is specified for supply voltages from 5 V (single) to ±15 V (dual), with improved precision over standard LM319 via tighter offset voltage (1 mV typ), offset current (40 nA typ), and voltage gain (20–40 V/mV) tolerances.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response Time | 80 ns at ±15 V supply - enables sub-100 ns threshold detection for fast pulse discrimination and digital edge generation. |
| Input Offset Voltage | 0.5–2 mV max at 25°C - ensures accurate voltage windowing and low-error zero-crossing detection in analog monitoring. |
| Input Offset Current | 20–80 nA max - minimizes error in high-impedance sensor interfaces such as thermistor or photodiode front-ends. |
| Output Sink Current | 25 mA max - directly drives electromechanical relays, LEDs, or TTL inputs without external buffer transistors. |
| Supply Voltage Range | Single 5 V or dual ±15 V - supports compatibility with both logic systems and legacy analog power rails. |
| Common-Mode Input Range | ±13 V at ±15 V supply; 1–3 V at 5-V supply - allows sensing near supply rails in battery-powered or rail-referenced systems. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded control, instrumentation, and industrial automation equipment. |
Pinout & Package
LM319AMX is housed in a 14-pin SOIC (D) package measuring 8.75 mm × 3.91 mm × 1.75 mm (max height), RoHS-compliant with SN lead finish and Level-1 MSL rating.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 14 | NC | No-connect pins - must remain unconnected per datasheet; no grounding or routing allowed. |
| 2 | GND 1 | Ground reference for comparator 1 - separate ground terminal enables isolated signal paths or differential referencing. |
| 3 | INPUT 1+ | Inverting/non-inverting input selection depends on external circuit - pin functions as either input polarity per design configuration. |
| 4 | INPUT 1− | Paired with Pin 3 for comparator 1 differential input - supports hysteresis feedback or reference biasing networks. |
| 5 | V− | Negative supply rail - accepts 0 V (for single-supply) or negative voltage (e.g., −15 V) to set output swing limits. |
| 6 | OUTPUT 1 | Open-collector NPN output - requires external pull-up resistor to define logic-high level and sink current up to 25 mA. |
| 7 | GND 2 | Ground reference for comparator 2 - electrically isolated from Pin 2 to support dual-ground system partitioning. |
| 8 | INPUT 2+ | Comparator 2 non-inverting input - used independently for second threshold comparison or window detector top bound. |
| 9 | INPUT 2− | Comparator 2 inverting input - paired with Pin 8 for second independent comparison function or hysteresis implementation. |
| 10 | V+ | Positive supply rail - accepts 5 V (logic-compatible) or +15 V (full-range analog) to configure operating headroom. |
| 11, 12, 13 | NC | No-connect pins - left floating per TI specification; no internal connection or functional role. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent comparators | Enables dual-threshold detection (e.g., window comparator) or parallel signal monitoring without external ICs. |
| 80-ns propagation delay | Supports >10 MHz pulse-width measurement and high-speed digital signal acquisition in test equipment and motor control. |
| Uncommitted open-collector outputs | Allows wired-OR logic, mixed-voltage interfacing, and direct relay/lamp driving with user-defined pull-up voltage and current. |
| Single 5-V or dual ±15-V operation | Eliminates need for dedicated analog supply rails in mixed-signal systems - simplifies power architecture and BOM count. |
| 0.5-mV typical input offset voltage | Reduces calibration burden in precision level-shifting and analog-to-digital front-end applications requiring <10 mV accuracy. |
Applications
| Relay Control System | Window Comparator |
|---|---|
|
Use Scenario: Monitoring AC line voltage for over/under-voltage shutdown in industrial power supplies. IC Role / Device Role / Timing Role: LM319AMX compares sensed voltage against upper and lower thresholds using dual comparators to assert fault latch signals. Use Value: 80-ns response ensures rapid isolation during transient surges; open-collector outputs directly drive optocoupler inputs for galvanic isolation. |
Use Scenario: Detecting valid temperature range in HVAC sensor interface before enabling compressor activation. IC Role / Device Role / Timing Role: LM319AMX implements hysteresis-based window detection with independent upper/lower trip points using Pins 3/4 and 8/9. Use Value: Tight 0.5–2 mV offset tolerance minimizes false triggering; dual-ground pins (Pins 2 & 7) reduce noise coupling between thresholds. |
| Digital Pulse Width Discriminator | TTL-Compatible Logic Interface |
|
Use Scenario: Converting analog PWM signals from microcontroller DACs into clean digital pulses for stepper motor drivers. IC Role / Device Role / Timing Role: LM319AMX acts as high-speed threshold detector with adjustable reference, generating precise rising/falling edges. Use Value: Sub-100 ns propagation delay preserves pulse timing integrity; 25 mA sink capability drives 74LS-series inputs without buffering. |
Use Scenario: Level-shifting 3.3-V sensor outputs to 5-V microcontroller GPIO inputs in automotive body control modules. IC Role / Device Role / Timing Role: LM319AMX compares sensor voltage to mid-rail reference and outputs TTL-compatible logic levels via pull-up to 5 V. Use Value: Rail-to-rail input range (1–3 V at 5-V supply) accommodates full 3.3-V swing; open-collector output prevents bus contention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual high-speed comparator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM393DR | Slower 1.3-μs response, lower supply current (0.8 mA), no dual-ground terminals, SOIC-8 package. | Better suited for low-power battery monitoring than high-speed pulse discrimination. | Select LM393DR only when speed <100 kHz and quiescent current <1 mA are primary constraints. |
| TL331IDBVR | Single comparator, 200-ns response, rail-to-rail input, SOT-23-5 package, 60-μA supply current. | Requires two units for dual-function use; lacks independent ground pins and relay-drive sink capability. | Choose TL331IDBVR for space-constrained, ultra-low-power designs where dual comparators can be implemented discretely. |
Compared with LM319AMX, LM393DR trades speed for power efficiency and integration density, while TL331IDBVR offers modern rail-to-rail operation but requires duplication and sacrifices drive strength and dual-ground isolation - making LM319AMX uniquely suitable for legacy-compatible, high-speed industrial threshold detection.
Availability
LM319AMX is available at Aetrix Electronics and suitable for relay control systems, window comparators, digital pulse discriminators, and TTL-compatible logic interfaces requiring stable component supply across commercial temperature ranges.
Supply support for LM319AMX 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 chain components.
The LM319AMX belongs to TI's legacy high-speed comparator product line, engineered specifically for industrial control, power supply supervision, and analog-to-digital interface applications demanding speed, robustness, and wide supply flexibility.
FAQ
What is the maximum output sink current of the LM319AMX?
The LM319AMX provides a guaranteed 25 mA output sink current per channel at 25°C when VOUT ≤ 1.5 V and VIN ≤ −10 mV. This allows direct drive of relays, LEDs, or TTL logic without external transistors. Derating applies above 70°C ambient, and the absolute maximum continuous sink is limited by power dissipation (500 mW) and thermal resistance (100°C/W for SOIC).
Does the LM319AMX support single-supply operation?
Yes, the LM319AMX operates from a single 5-V supply with input common-mode range of 1 V to 3 V and full functionality. Its open-collector outputs require an external pull-up resistor tied to the same or higher voltage rail. The device maintains 80-ns response time and 0.5–2 mV offset voltage under these conditions, making it suitable for 5-V logic systems and mixed-signal embedded designs.
What is the purpose of separate GND1 and GND2 pins on the LM319AMX?
Pins 2 (GND1) and 7 (GND2) provide independent ground references for each comparator's internal circuitry. This separation reduces crosstalk between channels and enables differential or isolated signal routing - critical in noise-sensitive applications like sensor front-ends or multi-channel data acquisition. Both grounds must connect to the same system ground plane unless intentional isolation is implemented externally.
Can the LM319AMX replace the LM319 in existing designs?
Yes, the LM319AMX is a drop-in replacement for the standard LM319 in SOIC-14 packages, sharing identical pinout, footprint, and electrical characteristics - except for tighter offset voltage (0.5–2 mV vs. 8 mV max), lower offset current (20–80 nA vs. 200 nA max), and improved voltage gain. No PCB changes are required, and performance upgrades occur automatically in precision threshold detection applications.
What is the recommended pull-up resistor value for LM319AMX outputs?
A 1.4-kΩ pull-up resistor to +5 V or +15 V is specified in TI's characterization (e.g., saturation voltage and response time tests). For 5-V logic, 1–10 kΩ balances speed and power; for relay drive, ≤1 kΩ ensures full 25 mA sink capability. Values below 470 Ω risk exceeding 500 mW total package dissipation at worst-case conditions.
LM319AMX Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- DTL, MOS, Open-Collector, Open-Emitter, RTL, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 36V, ±2.5V ~ 18V
- :
- 1mV @ ±15V
- Voltage - Input Offset (Max):
- 0.5µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 12.5mA
- Current - Quiescent (Max):
- -
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Surface Mount
- :
- 14-SOIC
LM319AMX FAQ
1.How can I place an order for LM319AMX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM319AMX 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 LM319AMX reliable?
The price and inventory of LM319AMX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM319AMX is usually 5 days.
3.What payment methods are accepted for LM319AMX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM319AMX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM319AMX?
LM319AMX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM319AMX 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 LM319AMX?
For technical support, including LM319AMX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM319AMX requirements.
6.How does Aetrix verify that LM319AMX is sourced from the original manufacturer or authorized distributors?
All LM319AMX 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 LM319AMX meets industry standards.
7.What is the process for return or replacement of LM319AMX?
All LM319AMX units undergo pre-shipment inspection (PSI). If there is an issue with LM319AMX, 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 LM319AMX part is unused and in its original packaging.
Return procedure for LM319AMX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM319AMX Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
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LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
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LM2901PWR
Texas Instruments
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LM2903DT
STMicroelectronics
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LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
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NCX2200GMAZ
NXP Semiconductors
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