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STMicroelectronics LM319D
- Part No.:
- LM319D
- Manufacturer:
- STMicroelectronics
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM319D.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14SO
- Quantity:
- Payment:
- Shipping:
Inventory:3,901
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Product details
Overview
LM319D from STMicroelectronics is a high-speed dual voltage comparator in SO-14 package, operating from +5 V single supply or ±15 V split supplies, with 80 ns typical response time at ±15 V, 1 µA maximum input bias current over 0 °C to +70 °C, and open-collector outputs capable of sinking 25 mA - used in relay drivers, window detectors, and TTL-compatible logic interface circuits.
For engineers reviewing the LM319D datasheet, LM319D pinout, LM319D application, or LM319D equivalent, key selection considerations include its wide supply range (+5 V to ±15 V), guaranteed 80 ns propagation delay, rail-to-rail common-mode input range (±12 V at ±15 V supply), open-collector output compatibility with TTL and discrete loads, and temperature-rated performance for commercial-grade systems.
Technical Context
The LM319D integrates two independent comparators with differential input stages featuring low input bias current (≤1 µA) and high gain, enabling precise threshold detection across wide common-mode ranges. Its internal circuitry supports operation down to +5 V logic supply while maintaining full specification up to ±15 V.
Each comparator features an open-collector NPN output stage capable of sinking up to 25 mA, allowing direct interfacing with TTL, lamps, relays, and pull-up resistors. The device lacks internal level-shifting or hysteresis, requiring external components for noise immunity or reference stabilization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | +5 V single supply or ±15 V dual supply - enables use in both digital logic and analog signal conditioning systems without level translation. |
| Typical Response Time | 80 ns at ±15 V - supports high-speed edge detection in timing-critical applications such as pulse-width monitoring or clock synchronization. |
| Input Bias Current | ≤1 µA over 0 °C to +70 °C - minimizes loading error on high-impedance sensor or reference networks. |
| Common-Mode Input Range | ±12 V at ±15 V supply - allows inputs to swing near supply rails without invalidating comparison accuracy. |
| Output Sink Current | 25 mA max - drives standard TTL inputs, LEDs, small relays, or optocouplers directly without external buffer transistors. |
| Input Offset Voltage | 2 mV (typ), 10 mV (max) - defines worst-case threshold error when comparing signals near ground or mid-supply. |
| Thermal Resistance (Junction-to-Ambient) | 105 °C/W (SO-14) - determines maximum power dissipation before thermal shutdown under still-air conditions. |
Pinout & Package
LM319D is housed in a 14-pin SOIC (SO-14) plastic micropackage, compliant with ECOPACK® environmental standards and rated for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 1 | Open-collector NPN output - requires external pull-up to define high-level voltage and sink current up to 25 mA. |
| 2 | Inverting Input 1 | Differential input node for first comparator - accepts voltages within common-mode range relative to supply rails. |
| 3 | Non-inverting Input 1 | Differential input node for first comparator - referenced against Pin 2 to determine output state transition. |
| 4 | Ground 1 | Signal reference for first comparator section - isolated from second comparator's ground (Pin 12) to support dual-supply partitioning. |
| 5 | N.C. | No internal connection - left unconnected; not usable for bypass or feedback. |
| 6 | N.C. | No internal connection - electrically floating; no routing or termination required. |
| 7 | VCC− | Negative supply terminal - connects to −15 V (or GND in single-supply mode) to bias internal circuitry. |
| 8 | VCC+ | Positive supply terminal - connects to +15 V (or +5 V in single-supply mode) to power both comparators. |
| 9 | N.C. | No internal connection - unused pin; must remain unconnected per datasheet guidance. |
| 10 | N.C. | No internal connection - no functional role; avoid routing or soldering. |
| 11 | Ground 2 | Signal reference for second comparator section - separate from Pin 4 to allow independent grounding schemes. |
| 12 | Inverting Input 2 | Differential input node for second comparator - operates independently of first comparator's inputs. |
| 13 | Non-inverting Input 2 | Differential input node for second comparator - paired with Pin 12 to define second comparison threshold. |
| 14 | Output 2 | Open-collector NPN output - functionally identical to Pin 1; requires dedicated pull-up resistor. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent comparators | Enables dual-threshold detection (e.g., window comparator) or parallel signal monitoring without cross-talk. |
| Wide supply voltage range (+5 V to ±15 V) | Eliminates need for separate voltage regulators in mixed-signal systems using both logic and analog supplies. |
| 80 ns typical response time at ±15 V | Supports real-time detection of fast transients in motor control feedback or digital communication timing recovery. |
| Open-collector outputs with 25 mA sink capability | Directly interfaces with TTL logic families, LED indicators, and electromechanical relays without added driver stages. |
| Isolated ground terminals per comparator | Permits independent grounding of each comparator section to reduce noise coupling in multi-channel sensing. |
Applications
| Relay Driver Circuit | Window Detector |
|---|---|
|
Use Scenario: Driving a 12 V DC relay coil from a microcontroller GPIO via comparator decision logic. IC Role / Device Role / Timing Role: Dual comparator compares sensed voltage against upper/lower thresholds to assert relay enable only within safe operating band. Use Value: Eliminates software polling and CPU overhead by providing hardware-level windowed decision with sub-100 ns latency. |
Use Scenario: Monitoring battery voltage in portable equipment to trigger low/high alert before critical cutoff. IC Role / Device Role / Timing Role: First comparator detects under-voltage condition; second detects over-voltage - outputs combined via wired-OR logic. Use Value: Provides fail-safe protection with deterministic response time unaffected by firmware execution delays. |
| TTL-Compatible Logic Interface | Pulse Width Monitoring |
|
Use Scenario: Converting analog sensor output (e.g., thermistor divider) into clean digital signal for FPGA input. IC Role / Device Role / Timing Role: Comparator acts as level translator with hysteresis added externally to reject noise-induced glitches. Use Value: Ensures robust signal integrity between analog front-end and digital back-end without requiring additional Schmitt triggers. |
Use Scenario: Measuring duty cycle of PWM signal from motor controller to verify timing compliance. IC Role / Device Role / Timing Role: One comparator detects rising edge; second detects falling edge - timing difference measured by counter. Use Value: Enables accurate pulse-width measurement with hardware resolution limited only by 80 ns propagation delay. |
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 response (1.3 µs typ), lower supply current (0.8 mA), no negative supply support - single +5 V only. | Suitable for low-power, non-critical timing applications where speed is secondary to quiescent current. | Select LM393DR only when 80 ns speed is unnecessary and system uses +5 V-only supply. |
| TL331IDBVR | Single comparator, 200 ns response, rail-to-rail input, 60 µA supply current - optimized for ultra-low power. | Requires two devices to replicate dual functionality; lacks isolated grounds and negative supply capability. | Choose TL331IDBVR only for space-constrained, battery-powered designs where dual-channel integration is not required. |
Compared with LM319D, LM393DR trades speed for lower power and simpler supply requirements, while TL331IDBVR offers rail-to-rail input but sacrifices channel count and high-speed performance - making LM319D uniquely suited for dual-channel, ±15 V, sub-100 ns timing-critical systems.
Availability
LM319D is available at Aetrix Electronics and suitable for relay driver circuits, window detector systems, and TTL-compatible logic interface designs requiring stable component supply across commercial temperature range (0 °C to +70 °C).
Supply support for LM319D 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, designing and manufacturing analog, digital, and mixed-signal ICs for industrial, automotive, and consumer markets.
The LM319 series belongs to ST's precision analog comparator product line, engineered specifically for high-speed, wide-supply-range applications where reliability and deterministic timing outweigh ultra-low power constraints.
FAQ
Can LM319D operate from a single +5 V supply?
Yes, LM319D is fully specified for operation from a single +5 V supply with ground reference. Its input common-mode range extends to within 1 V of either rail, and output saturation voltage remains below 0.4 V at 3.2 mA sink current under these conditions - enabling direct interface with 5 V TTL logic.
What is the maximum output sink current for LM319D?
The LM319D output stage can sink up to 25 mA per channel continuously, as verified in the Electrical Characteristics table under "Low level output voltage" test condition (Io = 25 mA). This rating applies across the full operating temperature range (0 °C to +70 °C) and supports direct driving of LEDs, small relays, and TTL inputs.
Does LM319D include internal hysteresis?
No, LM319D does not incorporate internal hysteresis. Its transfer function is purely comparator-based with no built-in positive feedback. External hysteresis must be added via resistor feedback from output to non-inverting input to prevent oscillation near threshold crossings in noisy environments.
How does LM319D differ from LM311 in output configuration?
LM319D features two independent open-collector outputs in one package, whereas LM311 is a single comparator with identical open-collector output structure. LM319D eliminates board space and BOM count needed for two LM311s, but shares the same output drive capability (25 mA sink) and lacks push-pull or CMOS output variants.
LM319D Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Package/Case:
- 14-SOIC (0.154", 3.90mm Width)
- 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:
- Surface Mount
- :
- 14-SO
LM319D FAQ
1.How can I place an order for LM319D through Aetrix?
Please submit a Request for Quotation (RFQ) for LM319D 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 LM319D reliable?
The price and inventory of LM319D are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM319D is usually 5 days.
3.What payment methods are accepted for LM319D?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM319D transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM319D?
LM319D orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM319D 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 LM319D?
For technical support, including LM319D datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM319D requirements.
6.How does Aetrix verify that LM319D is sourced from the original manufacturer or authorized distributors?
All LM319D 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 LM319D meets industry standards.
7.What is the process for return or replacement of LM319D?
All LM319D units undergo pre-shipment inspection (PSI). If there is an issue with LM319D, 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 LM319D part is unused and in its original packaging.
Return procedure for LM319D:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM319D Tags
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LM239DR
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LM2903P
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NCX2200GMAZ
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