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Texas Instruments LM319M
- Part No.:
- LM319M
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM319M.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,687
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Product details
Overview
LM319M from Texas Instruments is a high-speed dual comparator IC designed for precision threshold detection in industrial control and power supply monitoring circuits. It operates from single 5-V or dual ±15-V supplies, delivers 80-ns typical response time, supports ±5-V differential input voltage, and drives TTL/DTL/RTL loads up to 25 mA per output - enabling direct relay and lamp interfacing without external buffers.
For engineers reviewing the LM319M datasheet, LM319M pinout, LM319M application, or LM319M equivalent, key selection criteria include its 0°C to +70°C temperature range, SOIC-14 package compatibility with automated assembly, uncommitted collector outputs for flexible pull-up configuration, and verified performance at 80 ns with 5-mV overdrive - critical for fast-switching feedback and protection logic.
Technical Context
The LM319M implements two independent, internally compensated comparators on a monolithic bipolar process. Each channel features high common-mode slew rate and input isolation from system ground, allowing operation with inputs referenced to either supply rail or floating nodes.
Its open-collector outputs require external pull-up resistors and support mixed-voltage interfacing (e.g., 5-V logic driving 12-V relays). The device draws 8–12.5 mA total supply current at ±15 V and maintains stable operation across supply voltages from 5 V to ±15 V, with absolute maximum ratings up to 36 V total supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response Time | 80 ns typical at ±15 V with 100-mV input step and 5-mV overdrive - enables sub-100 ns decision latency in overvoltage/undervoltage lockout. |
| Input Offset Voltage | 8 mV max at 25°C - defines worst-case threshold error without trimming, suitable for ±1% accuracy applications. |
| Input Bias Current | 250 nA max at 25°C - minimizes voltage drop across high-impedance sensor dividers (e.g., thermistor networks). |
| Output Sink Current | 25 mA per channel - directly drives electromechanical relays, LEDs, or logic gates without external transistors. |
| Supply Voltage Range | Single 5 V or dual ±15 V - supports legacy industrial systems using ±15 V rails and modern 5-V microcontroller-based designs. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade embedded equipment, not extended or automotive environments. |
| Differential Input Voltage | ±5 V - constrains safe input swing relative to local reference; exceeds this risks internal junction breakdown. |
Pinout & Package
LM319M is packaged in a 14-pin SOIC (D) surface-mount package measuring 8.75 mm × 3.91 mm × 1.75 mm, compatible with standard reflow profiles (MSL Level-1, 260°C peak).
| Pin | 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 | GND 1 | Ground reference for comparator 1 inputs and output stage; electrically isolated from GND 2 to support split-ground sensing. |
| 3 | Input 1+ | Non-inverting input of comparator 1; accepts signals within ±13 V of supply rails when VS = ±15 V. |
| 4 | Input 1− | Inverting input of comparator 1; differential pair with Pin 3 determines output state based on relative voltage polarity. |
| 5 | V− | Negative supply terminal; must be connected to system ground or negative rail; not internally tied to GND 1 or GND 2. |
| 6 | Output 2 | Open-collector output of comparator 2; independently configurable with separate pull-up for dual-threshold or window detection. |
| 7 | GND 2 | Ground reference for comparator 2; enables independent grounding of two signal domains (e.g., isolated sensor front-end). |
| 8 | Input 2+ | Non-inverting input of comparator 2; identical electrical characteristics to Pin 3, supporting parallel or cascaded comparison. |
| 9 | Input 2− | Inverting input of comparator 2; used with Pin 8 to implement second independent threshold decision point. |
| 10 | V+ | Positive supply terminal; accepts 5 V (single supply) or +15 V (dual supply); must be decoupled locally for noise immunity. |
| 11–14 | No Connect | Unused pins; must remain unconnected and unbonded - no internal circuitry or thermal function. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent comparators | Enables dual-threshold detection (e.g., over/under-voltage) or redundant sensing without external ICs. |
| Uncommitted collector outputs | Supports flexible interface to TTL, DTL, RTL, lamps, or relays via user-selected pull-up voltage and resistor value. |
| Input isolation from system ground | Allows comparator inputs to float relative to main system ground - essential for high-side current sensing or isolated power monitoring. |
| High common-mode slew rate | Maintains accurate comparison during fast-rising common-mode transients (e.g., switching regulator ripple). |
| Low input current (250 nA max) | Minimizes loading on high-impedance sources like precision voltage dividers or capacitive sensors. |
Applications
| Power Supply Monitoring | Industrial Relay Control |
|---|---|
|
Use Scenario: Detecting undervoltage and overvoltage conditions on a 24-V DC industrial power rail to trigger shutdown before damage occurs. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel monitors upper threshold, the other lower threshold. Use Value: 80-ns response ensures fault detection within one switching cycle of a 10 kHz DC-DC converter, preventing MOSFET shoot-through. |
Use Scenario: Driving a 12-V SPDT relay from a 3.3-V microcontroller GPIO to isolate PLC I/O modules. IC Role / Device Role / Timing Role: Level-shifting and current-boosting interface - LM319M compares MCU logic level and sinks 25 mA into relay coil. Use Value: Eliminates need for discrete transistor driver stage, reducing BOM count and PCB area while maintaining 80 ns activation latency. |
| Motor Overtemperature Protection | ADC Reference Window Detection |
|
Use Scenario: Monitoring thermistor voltage in a motor winding to trip thermal cutoff before insulation failure. IC Role / Device Role / Timing Role: Precision threshold comparator with low input bias current to avoid self-heating errors in high-resistance thermistor networks. Use Value: 250 nA max input bias introduces <1 mV error across 100 kΩ thermistor divider, preserving ±2°C temperature accuracy. |
Use Scenario: Validating that an external 2.5-V reference stays within ±1% tolerance before enabling ADC conversion in medical instrumentation. IC Role / Device Role / Timing Role: High-speed reference monitor - one comparator checks upper limit, the other lower limit against buffered reference. Use Value: 80 ns response allows real-time validation prior to each ADC sample, ensuring data integrity without software overhead. |
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), rail-to-rail input, but only 5-V max supply. | Better suited for low-power battery monitoring; unsuitable for ±15 V systems or sub-microsecond timing. | Select LM393DR only when supply is strictly 5 V and speed >100 ns is unnecessary. |
| TL331IDBVR | Single-channel, 200-ns response, 5-V only, push-pull output (no pull-up required), 60 μA supply current. | Requires two devices for dual functionality; eliminates external pull-ups but increases component count and layout area. | Choose TL331IDBVR when board space permits duplication and simplified output drive is prioritized over speed and dual integration. |
Compared with LM393DR and TL331IDBVR, the LM319M uniquely balances 80-ns speed, ±15 V operation, dual integration, and open-collector flexibility - making it irreplaceable in legacy industrial designs requiring fast, robust, multi-rail threshold detection without redesign.
Availability
LM319M is available at Aetrix Electronics and suitable for industrial control systems, power supply supervision, relay interface modules, and analog signal conditioning circuits requiring stable component supply across long production lifecycles.
Supply support for LM319M 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 LM319M belongs to TI's legacy high-speed comparator product line, engineered specifically for industrial and instrumentation applications demanding fast, reliable threshold detection under wide supply voltage ranges and noisy operating conditions.
FAQ
What is the maximum supply voltage rating for the LM319M?
The LM319M has an absolute maximum total supply voltage of 36 V, meaning the difference between V+ and V− must not exceed 36 V. It is fully specified for operation from a single 5-V supply (V+ = 5 V, V− = 0 V) or dual ±15-V supplies (V+ = +15 V, V− = −15 V). Exceeding ±15 V or applying more than 16 V from ground to either supply rail risks permanent damage.
Does the LM319M support rail-to-rail input operation?
No, the LM319M does not support rail-to-rail input. Its input common-mode voltage range is limited to ±13 V when operated at ±15 V supplies, and only 1 V to 3 V when powered from a single 5-V supply. Inputs must remain within these bounds to ensure proper comparator function and avoid phase reversal or latch-up.
Can the LM319M drive a relay directly without an external transistor?
Yes, the LM319M can drive small to medium electromagnetic relays directly. Each open-collector output is rated for 25 mA sink current at 25°C, sufficient for many 5–12 V coils with DC resistance >500 Ω. A properly sized pull-up resistor (e.g., 1 kΩ to 12 V) must be used, and thermal derating should be applied for continuous operation above 25°C.
What is the purpose of separate GND 1 and GND 2 pins on the LM319M?
GND 1 and GND 2 provide electrically isolated ground references for the two comparator channels. This allows each comparator to monitor signals referenced to different ground domains - such as isolated current-sense amplifiers or floating sensor bridges - without introducing ground-loop errors or compromising noise immunity in mixed-signal systems.
Is the LM319M pin-compatible with the LM319A variant?
No, the LM319M and LM319A share identical pinout and package (SOIC-14), but they are not functionally interchangeable without design review. The LM319A offers tighter specifications - 2 mV max input offset voltage versus 8 mV for LM319M - and improved offset current (80 nA vs. 200 nA). Substituting LM319A may improve accuracy but does not guarantee compatibility in circuits relying on LM319M's specific tolerance margins.
LM319M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Obsolete
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- DTL, Open-Collector, Open-Emitter, RTL, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 36V, ±2.5V ~ 18V
- :
- 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:
- Surface Mount
- :
- 14-SOIC
LM319M FAQ
1.How can I place an order for LM319M through Aetrix?
Please submit a Request for Quotation (RFQ) for LM319M 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 LM319M reliable?
The price and inventory of LM319M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM319M is usually 5 days.
3.What payment methods are accepted for LM319M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM319M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM319M?
LM319M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM319M 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 LM319M?
For technical support, including LM319M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM319M requirements.
6.How does Aetrix verify that LM319M is sourced from the original manufacturer or authorized distributors?
All LM319M 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 LM319M meets industry standards.
7.What is the process for return or replacement of LM319M?
All LM319M units undergo pre-shipment inspection (PSI). If there is an issue with LM319M, 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 LM319M part is unused and in its original packaging.
Return procedure for LM319M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM319M Tags
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LM339DR
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LM239DR
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LM2903P
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