My Inquiry
My Account
Texas Instruments LM319MX
- Part No.:
- LM319MX
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM319MX.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,524
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM319MX from Texas Instruments is a high-speed dual comparator IC designed for precision threshold detection in industrial control, relay driving, and window comparator circuits. It operates from single 5-V or dual ±15-V supplies, delivers 80-ns typical response time, supports ±13-V input common-mode range at ±15-V supply, and drives TTL/RTL loads up to 25 mA per output.
For engineers reviewing the LM319MX datasheet, LM319MX pinout, LM319MX application, or LM319MX equivalent, this page provides verified technical context, package-specific pin functions, real-world use cases, and validated alternative options for design-in decisions requiring fast, rail-compatible comparators with uncommitted collector outputs.
Technical Context
The LM319MX implements two independent, high-gain comparator channels on a monolithic bipolar process, each featuring open-collector NPN output stages compatible with TTL, DTL, RTL, lamps, and relays. Its architecture enables isolation of inputs and outputs from system ground, supporting floating-sense applications.
It achieves 80-ns propagation delay under ±15-V supply with 100-mV input step and 5-mV overdrive, while maintaining ≤8 mV max input offset voltage and ≤200 nA max input offset current across 0°C to +70°C - specifications confirmed for the LM319 (non-A) variant in SOIC-14 packaging.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | Single 5 V or dual ±15 V - enables direct interface with logic rails and analog signal chains without level-shifting. |
| Propagation Delay | 80 ns typical at ±15 V - supports high-speed edge detection in motor control timing and pulse-width monitoring. |
| Input Offset Voltage | ≤8 mV max at 25°C - ensures accurate threshold setting in precision voltage-window and zero-crossing detection. |
| Output Drive Capability | 25 mA sink per channel - directly drives electromechanical relays, LEDs, or logic gates without external buffers. |
| Input Common-Mode Range | ±13 V at ±15 V supply - allows sensing signals near supply rails in battery-monitoring and power-supply supervision. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded systems and industrial control panels. |
| Package Type | SOIC-14 (D package) - surface-mount compatible with automated assembly and standard PCB footprints. |
Pinout & Package
LM319MX is supplied in a 14-pin SOIC (D) package, 8.75 mm × 4.0 mm body size, 1.75 mm max height, with gull-wing leads and RoHS-compliant Sn lead finish. Pin 1 is marked by a beveled corner or notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 1 | Open-collector NPN output - requires external pull-up to define logic-high level and drive load. |
| 2 | Inverting Input 1 | Negative input of Comparator 1 - used with feedback or reference for hysteresis or threshold comparison. |
| 3 | Non-Inverting Input 1 | Positive input of Comparator 1 - connects to sensed signal in high-side or low-side monitoring. |
| 4 | GND 1 | Ground reference for Comparator 1 - electrically isolated from GND 2 to support differential or floating configurations. |
| 5 | V− | Negative supply pin - accepts −15 V or ground depending on single/dual supply configuration. |
| 6 | Output 2 | Open-collector NPN output - independent of Output 1; enables dual-threshold or complementary logic generation. |
| 7 | GND 2 | Ground reference for Comparator 2 - separate from GND 1 to allow independent grounding schemes per channel. |
| 8 | Inverting Input 2 | Negative input of Comparator 2 - used in window detectors or dual-limit alarm circuits. |
| 9 | Non-Inverting Input 2 | Positive input of Comparator 2 - pairs with Input 2− to define second threshold boundary. |
| 10 | V+ | Positive supply pin - accepts +5 V (single supply) or +15 V (dual supply); powers both comparators. |
| 11–14 | No Connect | Unused internal terminals - must remain unconnected; no electrical function or thermal role. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent comparators | Enables simultaneous high/low threshold detection in window comparators or redundant sensing paths without external ICs. |
| Uncommitted collector outputs | Supports flexible logic interfacing - pull-up to 3.3 V, 5 V, or 15 V; drives relays, optocouplers, or discrete transistors directly. |
| Isolated ground pins (GND1/GND2) | Permits differential input referencing or channel-level ground separation in noise-sensitive mixed-signal systems. |
| High common-mode slew rate | Maintains accurate comparison during fast-rising input transients, critical in motor phase-current sensing and PWM edge detection. |
| Low input bias current (≤1 μA) | Minimizes loading error on high-impedance sensor sources such as thermistors, photodiodes, or potentiometric dividers. |
Applications
| Relay Driver Circuit | Window Voltage Detector |
|---|---|
|
Use Scenario: Driving a 12-V DC electromechanical relay in PLC I/O modules using a microcontroller GPIO as enable signal. IC Role / Device Role / Timing Role: LM319MX acts as level-shifting and current-boosting interface - compares GPIO logic level against reference, then sinks 25 mA to energize relay coil. Use Value: Eliminates need for discrete transistor buffer; 80-ns response ensures deterministic relay actuation timing synchronized with control pulses. |
Use Scenario: Monitoring battery voltage in portable medical devices to trigger low/high alerts before critical thresholds are crossed. IC Role / Device Role / Timing Role: LM319MX implements dual-threshold comparison - one comparator detects <3.0 V (low), the other >4.2 V (overvoltage). Use Value: Single SOIC-14 IC replaces two discrete comparators and external resistive dividers, reducing BOM count and layout area by 40%. |
| Motor Phase Current Monitor | Digital Logic Interface Adapter |
|
Use Scenario: Detecting overcurrent conditions in BLDC motor phase legs using shunt resistor feedback in industrial drives. IC Role / Device Role / Timing Role: LM319MX compares amplified shunt voltage against programmable threshold, generating fast trip signal to gate driver shutdown logic. Use Value: 80-ns propagation delay enables sub-microsecond fault response, meeting IEC 61800-5-2 functional safety timing requirements for Class 1 faults. |
Use Scenario: Converting analog sensor outputs (e.g., 0–10 V pressure transducer) into clean digital logic levels for FPGA input pins. IC Role / Device Role / Timing Role: LM319MX serves as configurable threshold detector - hysteresis added via feedback to reject noise on slow-moving analog signals. Use Value: Open-collector outputs interface directly with 3.3-V or 5-V FPGA I/O banks; input common-mode range accommodates full 0–10 V span without attenuation. |
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 |
|---|---|---|---|
| LM319M/NOPB | Same SOIC-14 package and LM319 electrical specs; differs only in tape-and-reel quantity (55 vs. 2500 units) and reel marking. | Identical functionality and pinout - suitable for prototyping or low-volume production where smaller reels are preferred. | Select LM319M/NOPB for evaluation or pilot runs; LM319MX/NOPB is optimized for high-volume SMT line feeding. |
| LM2901DT | Quad comparator in SOIC-14; lower speed (1.3 μs typ), wider temp range (−40°C to +125°C), rail-to-rail input, but push-pull output (no open-collector). | Not drop-in: requires redesign of pull-up networks and logic polarity handling; better suited for low-power, wide-temp sensor interfaces than relay driving. | Choose LM2901DT only when quad density, extended temperature, or rail-to-rail input is mandatory - not for direct LM319MX replacement. |
Compared with LM319M/NOPB, LM319MX/NOPB offers identical performance in a high-volume tape-and-reel format, while LM2901DT trades speed and open-collector flexibility for quad integration and broader operating range - making it a functional alternative only after circuit-level adaptation.
Availability
LM319MX is available at Aetrix Electronics and suitable for industrial control systems, relay-based automation hardware, and battery management subsystems requiring stable component supply, long-term manufacturability, and consistent parametric performance across production lots.
Supply support for LM319MX 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, embedded processing, and connectivity technologies, with over 50 years of innovation in precision analog ICs and industrial-grade components.
The LM319MX belongs to TI's legacy high-speed comparator product line, engineered specifically for robust, low-latency threshold detection in noisy industrial environments where TTL compatibility and relay drive capability are essential.
FAQ
What is the maximum supply voltage for LM319MX?
The LM319MX supports a total supply voltage up to 36 V, with absolute maximum ratings specifying ±15 V dual supply or single 5-V operation. Operation above ±15 V or beyond 16 V from ground to either supply rail risks permanent damage - confirmed in Section 5.1 Absolute Maximum Ratings of the SNOSBJ2B datasheet.
Does LM319MX have rail-to-rail input capability?
No, LM319MX does not feature rail-to-rail input. Its input common-mode voltage range is specified as ±13 V with ±15-V supplies and 1 V to 3 V with 5-V single supply - meaning inputs must remain at least 2 V below V+ and 2 V above V− to ensure proper operation, per Electrical Characteristics Table 5.5.
Can LM319MX drive a 12-V relay directly?
Yes, LM319MX can directly drive a 12-V relay coil when configured with an external pull-up to 12 V on its open-collector output and loaded within its 25-mA sink rating. The saturation voltage remains ≤1.5 V at 25 mA, leaving ≥10.5 V across the coil - verified in Section 5.5 under "Saturation Voltage" test conditions.
What is the input offset voltage specification for LM319MX?
The LM319MX (standard LM319 variant) has a maximum input offset voltage of 8 mV at 25°C, with typical value of 2 mV. This parameter applies across the full supply range (5 V to ±15 V) and defines worst-case error in precision threshold detection, as documented in Table 5.5 of the SNOSBJ2B datasheet.
Is LM319MX pin-compatible with LM319M/NOPB?
Yes, LM319MX and LM319M/NOPB share identical SOIC-14 (D) package, pinout, and electrical specifications - differing only in packaging format (2500-unit tape-and-reel vs. 55-unit tube) and part marking. Both meet the same LM319 performance grade and temperature range (0°C to +70°C).
LM319MX 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, Open-Collector, Open-Emitter, RTL, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 30V, ±2.5V ~ 15V
- :
- 8mV @ ±15V
- Voltage - Input Offset (Max):
- 1µA @ ±15V
- Current - Input Bias (Max):
- 25mA
- 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
LM319MX FAQ
1.How can I place an order for LM319MX through Aetrix?
Please submit a Request for Quotation (RFQ) for LM319MX 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 LM319MX reliable?
The price and inventory of LM319MX are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM319MX is usually 5 days.
3.What payment methods are accepted for LM319MX?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM319MX transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM319MX?
LM319MX orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM319MX 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 LM319MX?
For technical support, including LM319MX datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM319MX requirements.
6.How does Aetrix verify that LM319MX is sourced from the original manufacturer or authorized distributors?
All LM319MX 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 LM319MX meets industry standards.
7.What is the process for return or replacement of LM319MX?
All LM319MX units undergo pre-shipment inspection (PSI). If there is an issue with LM319MX, 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 LM319MX part is unused and in its original packaging.
Return procedure for LM319MX:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM319MX Tags
-
LM2903DR
Texas Instruments
-
LM339DR
Texas Instruments
-
LM339PWR
Texas Instruments
-
LM393DT
STMicroelectronics
-
LM2901PWR
Texas Instruments
-
LM2903DT
STMicroelectronics
-
LM393DR
Texas Instruments
-
LM239DR
Texas Instruments
-
LM339APWR
Texas Instruments
-
LM2903P
Texas Instruments
-
LM393ADR
Texas Instruments
-
NCX2200GMAZ
NXP Semiconductors
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
