My Inquiry
My Account
STMicroelectronics LM319N
- Part No.:
- LM319N
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LM319N.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,981
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
LM319N from STMicroelectronics is a high-speed dual comparator IC with open-collector outputs, designed for precision voltage comparison in logic-level and mixed-signal systems. It operates from +5 V single supply or ±15 V split supplies, delivers 80 ns typical response time at ±15 V, supports ±12 V input common-mode range, and sinks up to 25 mA per output - enabling direct TTL interfacing and relay/lamp driving.
For engineers reviewing the LM319N datasheet, LM319N pinout, LM319N application, or LM319N equivalent, this page provides verified technical context, validated pin functions, real-world use cases in industrial control and power monitoring, and confirmed alternative comparators with documented electrical and thermal differences.
Technical Context
The LM319N integrates two independent comparators sharing no internal biasing; each features bipolar input stages with ≤1 µA max input bias current over 0 °C to +70 °C, and differential input voltage tolerance of ±5 V. Its open-collector outputs require external pull-up resistors and support rail-to-rail output swing relative to VCC+ and VCC−.
Designed for wide-supply flexibility, it maintains specified performance from +5 V/0 V up to ±15 V, with input common-mode range extending to within 1 V of either supply rail. The internal schematic includes matched transistor pairs and active current mirrors to ensure stable gain (≥8 V/mV) and low offset drift across temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +5 V single supply or ±5 V to ±15 V dual supply - enables compatibility with 5 V logic and legacy ±12 V analog systems. |
| Typical Response Time | 80 ns at ±15 V with 100 mV step and 5 mV overdrive - suitable for pulse-width detection and fast threshold triggering. |
| Input Offset Voltage | 2–10 mV max over temperature - defines minimum detectable voltage difference before output switching. |
| Output Sink Current | 25 mA per channel - sufficient to drive LEDs, small relays, or TTL inputs without external buffers. |
| Input Bias Current | 250–1200 nA max - ensures minimal loading on high-impedance sensor sources like thermistors or photodiodes. |
| Common-Mode Input Range | ±12 V at ±15 V supply - allows direct comparison of signals referenced to system ground or floating supplies. |
| Operating Temperature | 0 °C to +70 °C - qualified for commercial-grade embedded instrumentation and power supply feedback loops. |
Pinout & Package
LM319N is supplied in a 14-pin plastic DIP (Dual In-line Package) with 0.3-inch body width and through-hole mounting. Pin spacing follows standard 2.54 mm pitch; package meets RoHS and ECOPACK® environmental compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 1 | Open-collector output of Comparator 1 - requires external pull-up to define logic HIGH level and sink current up to 25 mA. |
| 2 | Inverting Input 1 | Inverting input terminal of Comparator 1 - accepts input voltages within common-mode range relative to supply rails. |
| 3 | Non-inverting Input 1 | Non-inverting input terminal of Comparator 1 - used for reference or signal comparison with hysteresis capability. |
| 4 | Ground 1 | Ground connection for Comparator 1 output stage - electrically isolated from Ground 2 to support dual-supply operation. |
| 5 | N.C. | No internal connection - left unconnected; not bonded or functional in die layout. |
| 6 | N.C. | No internal connection - unused pin; must remain floating or grounded per PCB layout best practices. |
| 7 | VCC− | Negative supply rail input - connects to −5 V to −15 V or GND when using single +5 V supply. |
| 8 | VCC+ | Positive supply rail input - connects to +5 V to +15 V; powers both comparators and output stages. |
| 9 | N.C. | No internal connection - unused pin; no internal bond wire or circuit node attached. |
| 10 | N.C. | No internal connection - reserved for future revision or test access; not functional in LM319N. |
| 11 | Ground 2 | Ground connection for Comparator 2 output stage - isolated from Ground 1 to prevent crosstalk in dual-output configurations. |
| 12 | Output 2 | Open-collector output of Comparator 2 - independently controllable; shares same VCC+/VCC− but separate ground path. |
| 13 | Inverting Input 2 | Inverting input terminal of Comparator 2 - supports independent voltage window detection or dual-threshold sensing. |
| 14 | Non-inverting Input 2 | Non-inverting input terminal of Comparator 2 - enables simultaneous high/low limit comparison with shared reference. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent comparators | Electrically isolated input/output paths allow concurrent threshold detection without interaction - critical for window comparators and dual-limit alarms. |
| Wide supply voltage range | Operates from +5 V/0 V to ±15 V - eliminates need for level-shifting in mixed-voltage systems such as industrial PLC I/O modules. |
| 80 ns propagation delay | Enables accurate timing of fast transients in motor commutation feedback or overvoltage protection circuits. |
| 25 mA output sink capability | Drives electromechanical loads directly - reduces BOM count by eliminating external driver transistors in relay interface designs. |
| Isolated ground terminals | Separate Ground 1 and Ground 2 pins minimize inter-channel coupling and improve noise immunity in high-density layouts. |
Applications
| Relay Driver Circuit | Window Voltage Detector |
|---|---|
|
Use Scenario: Controlling a 12 V DC relay coil based on a microcontroller's digital output or analog sensor threshold. IC Role / Device Role / Timing Role: Dual comparator acts as level translator and current amplifier - one channel triggers relay ON, the other provides fail-safe OFF confirmation. Use Value: Eliminates discrete transistor stage; open-collector outputs interface directly with relay coil and flyback diode, reducing footprint and component count. |
Use Scenario: Monitoring battery voltage between upper and lower thresholds (e.g., 11.5 V–12.8 V) to indicate healthy charge state. IC Role / Device Role / Timing Role: One comparator monitors upper limit, the other lower limit - outputs combined via wired-AND to generate in-window logic HIGH. Use Value: Achieves precise hysteresis-free window detection with <10 mV offset error - avoids false trips during slow-varying battery discharge curves. |
| Power Supply Monitor | TTL-Compatible Signal Comparator |
|
Use Scenario: Detecting undervoltage lockout (UVLO) and overvoltage protection (OVP) conditions in a +5 V regulated DC supply. IC Role / Device Role / Timing Role: Compares sensed supply voltage against precision references; outputs feed OR-gated logic to reset controller or disable switching regulator. Use Value: 80 ns response ensures shutdown occurs within one switching cycle of fault onset - prevents MOSFET shoot-through or capacitor overvoltage. |
Use Scenario: Converting analog sensor outputs (e.g., 0–3.3 V thermistor divider) into clean 0 V / +5 V TTL logic levels for FPGA or microcontroller input. IC Role / Device Role / Timing Role: Comparator performs rail-to-rail input-to-output translation with defined hysteresis via external feedback. Use Value: Input bias current <1.2 µA minimizes voltage drop across high-value sensor dividers - preserves accuracy without buffer op-amps. |
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 |
|---|---|---|---|
| LM393N | Slower response (1.3 µs), lower supply current (0.8 mA), no negative supply support - single +5 V only. | Not suitable for ±15 V analog front-ends or fast transient detection; limited to low-speed digital interfacing. | Select when cost and power efficiency outweigh speed requirements, and dual-supply operation is unnecessary. |
| TL331IDBVR | Single comparator, 200 ns response, rail-to-rail input, 60 µA supply current - optimized for ultra-low-power battery systems. | Requires two devices for dual functionality; lacks isolated grounds and high sink current for relay driving. | Choose for space-constrained portable instruments where 25 mA sink and dual-channel integration are not required. |
Compared with LM319N, LM393N trades speed and supply flexibility for lower cost and quiescent current, while TL331IDBVR offers rail-to-rail input and micropower operation but sacrifices dual-channel integration and output drive strength.
Availability
LM319N is available at Aetrix Electronics and suitable for industrial control panels, power supply supervision systems, and analog signal conditioning circuits requiring stable component supply across extended production lifecycles.
Supply support for LM319N 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 silicon solutions for automotive, industrial, and consumer markets since 1987.
The LM319N belongs to ST's legacy precision analog comparator family, engineered for robust performance in mixed-signal environments where speed, supply flexibility, and output drive capability are prioritized over ultra-low power.
FAQ
Can LM319N operate from a single +5 V supply?
Yes, LM319N is fully specified for single +5 V operation with VCC+ = +5 V and VCC− = 0 V. Input common-mode range extends to 1 V above ground, and output saturation voltage remains below 0.4 V at 3.2 mA sink current - ensuring reliable TTL logic compatibility without level shifters.
What is the maximum output sink current per channel?
The LM319N can sink up to 25 mA per output channel under specified conditions (VCC = ±15 V, Tamb = +25 °C). At elevated temperatures or reduced supply voltage, derating applies - e.g., 20 mA maximum at +70 °C with +5 V supply, as confirmed in Figure 4 of the datasheet.
Are the ground pins internally connected?
No, Ground 1 (Pin 4) and Ground 2 (Pin 11) are electrically isolated on-die and must be connected separately in the PCB layout. This isolation prevents crosstalk between comparator output stages and supports independent grounding schemes in noisy industrial environments.
Does LM319N include built-in hysteresis?
No, LM319N has no internal hysteresis. Hysteresis must be added externally via positive feedback from output to non-inverting input. Typical values use 100 kΩ–1 MΩ resistors to achieve 10–100 mV hysteresis - essential for noise immunity in slow-moving input signals like temperature sensors.
LM319N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Open-Emitter, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 30V, ±2.5V ~ 15V
- :
- 8mV @ ±15V
- Voltage - Input Offset (Max):
- 1µA @ ±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:
- Through Hole
- :
- 14-DIP
LM319N FAQ
1.How can I place an order for LM319N through Aetrix?
Please submit a Request for Quotation (RFQ) for LM319N 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 LM319N reliable?
The price and inventory of LM319N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM319N is usually 5 days.
3.What payment methods are accepted for LM319N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM319N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM319N?
LM319N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM319N 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 LM319N?
For technical support, including LM319N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM319N requirements.
6.How does Aetrix verify that LM319N is sourced from the original manufacturer or authorized distributors?
All LM319N 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 LM319N meets industry standards.
7.What is the process for return or replacement of LM319N?
All LM319N units undergo pre-shipment inspection (PSI). If there is an issue with LM319N, 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 LM319N part is unused and in its original packaging.
Return procedure for LM319N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM319N 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…
