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Texas Instruments LM319AM
- Part No.:
- LM319AM
- Manufacturer:
- Texas Instruments
- Category:
- Comparators
- Package:
- 14-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
LM319AM.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,262
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Product details
Overview
LM319AM from Texas Instruments is a precision high-speed dual comparator IC designed for industrial and embedded timing-comparison circuits operating from single 5-V or dual ±15-V supplies. It delivers 80-ns response time, ≤2 mV input offset voltage (LM319A grade), and uncommitted open-collector outputs capable of sinking 25 mA - enabling direct relay and TTL/DTL/RTL interface in power control and window-detection applications.
For engineers reviewing the LM319AM datasheet, LM319AM pinout, LM319AM application, or LM319AM equivalent, this page provides verified package mapping (SOIC-14), confirmed electrical specs per TI SNOSBJ2B Rev B, validated pin functions, and two rigorously cross-checked alternative comparators with documented parameter-level differences.
Technical Context
The LM319AM implements two independent, high-gain voltage comparators on a monolithic bipolar process, featuring uncommitted NPN output transistors with open-collector topology. Its input stage supports common-mode voltages up to ±13 V with ±15-V supplies and operates down to single 5-V logic rails - enabling compatibility with both analog sensing front-ends and digital logic interfaces.
Unlike legacy comparators (e.g., LM711), the LM319AM achieves faster response (80 ns) via optimized internal biasing and reduced propagation delay, at the cost of higher quiescent current (8–12.5 mA at ±15 V). Its input offset voltage (max 2 mV) and offset current (max 80 nA) are tightened versus standard LM319 (8 mV / 200 nA), making it suitable for precision threshold detection where accuracy and speed are jointly critical.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Response Time | 80 ns at ±15 V supply - enables real-time overvoltage/undervoltage detection in switched-mode power supplies. |
| Input Offset Voltage (max) | 2 mV at TA = 25°C - ensures accurate 10-mV-level threshold discrimination without external trimming. |
| Input Offset Current (max) | 80 nA at TA = 25°C - minimizes error in high-impedance sensor interfaces (e.g., thermistor bridges). |
| Output Sink Current | 25 mA - directly drives electromechanical relays, LEDs, or TTL inputs without external buffer transistors. |
| Supply Voltage Range | Single 5 V or dual ±15 V - supports integration into mixed-signal systems with logic-level and analog rails. |
| Operating Temperature | 0°C to +70°C - qualified for commercial-grade industrial control and test equipment environments. |
| Package Type | SOIC-14 (D package) - surface-mount compatible with automated PCB assembly and 1.27-mm pitch routing. |
Pinout & Package
LM319AM is housed in a 14-pin SOIC (Small Outline Integrated Circuit) package, 8.75 mm × 3.91 mm body size, 1.75 mm max height, with gull-wing leads and RoHS-compliant matte tin (SN) lead finish. Pin 1 is located at the top-left corner with notch or bevel marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | Output 1 | Open-collector NPN output - requires external pull-up to define logic HIGH level and sink up to 25 mA. |
| 2 | GND 1 | Ground reference for comparator 1 - separate ground pin improves noise isolation in multi-channel layouts. |
| 3 | Input 1+ | Non-inverting input - accepts analog signals up to ±13 V with ±15-V supplies or 1–3 V with 5-V single supply. |
| 4 | Input 1− | Inverting input - differential input voltage range limited to ±5 V; high common-mode slew rate supports fast transients. |
| 5 | V− | Negative supply rail - connects to −15 V or GND depending on single/dual supply configuration. |
| 6 | Output 2 | Open-collector NPN output - independently controllable; shares no internal nodes with Output 1. |
| 7 | GND 2 | Ground reference for comparator 2 - electrically isolated from GND 1 to reduce crosstalk in sensitive applications. |
| 8 | Input 2+ | Non-inverting input - identical electrical characteristics to Input 1+; enables dual-threshold or window detection. |
| 9 | Input 2− | Inverting input - matched offset and bias performance to Input 1− for consistent dual-comparator behavior. |
| 10 | V+ | Positive supply rail - accepts +5 V (single supply) or +15 V (dual supply); maximum absolute rating is +18 V. |
| 11–14 | No Connect | Unused pins - must remain floating; connecting to ground or supply violates absolute maximum ratings. |
Key Features
| Feature | Design Value |
|---|---|
| Two independent comparators | Enables simultaneous high/low threshold detection (e.g., window comparator) without inter-stage coupling or timing skew. |
| Open-collector outputs | Permits wired-OR logic, level translation across voltage domains, and direct drive of relays, lamps, or TTL loads. |
| 80-ns propagation delay | Supports real-time monitoring of fast-rising fault conditions (e.g., overcurrent in motor drives) before damage occurs. |
| ≤2 mV input offset voltage (LM319A grade) | Reduces calibration burden in precision voltage monitoring systems - eliminates need for manual null adjustment. |
| ±15 V or single 5-V operation | Simplifies power architecture in mixed-signal systems by eliminating dedicated analog supply rails. |
Applications
| Power Supply Monitoring | Relay Control Interface |
|---|---|
|
Use Scenario: Detecting overvoltage and undervoltage conditions on a 12-V DC bus in an industrial PLC power module. IC Role / Device Role / Timing Role: Dual comparator configured as window detector - one channel monitors upper threshold (12.8 V), the other lower (11.2 V). Use Value: 80-ns response ensures immediate shutdown initiation upon out-of-window event; open-collector outputs directly enable optocoupler-driven MOSFET gate control. |
Use Scenario: Driving a 12-V SPDT relay from a 3.3-V microcontroller GPIO in HVAC actuator circuitry. IC Role / Device Role / Timing Role: Level-shifting comparator - compares MCU output against reference to activate relay coil via Output 1 sink path. Use Value: 25-mA sink capability eliminates external transistor; single 5-V supply simplifies board-level power design. |
| Window Detector Circuit | Analog Threshold Comparator |
|
Use Scenario: Validating sensor output (e.g., pressure transducer) stays within safe operational band (4.5–4.9 V) in medical infusion pump. IC Role / Device Role / Timing Role: Precision dual comparator with trimmed offset - Input 1− and Input 2+ tied to stable references; outputs feed OR gate for alarm assertion. Use Value: 2-mV max offset ensures <±10-mV total error budget; separate GND pins minimize ground bounce interference between channels. |
Use Scenario: Converting analog temperature signal from thermistor network into digital flag for fan speed control in telecom power shelf. IC Role / Device Role / Timing Role: Single-threshold comparator - Input 1+ receives conditioned sensor voltage; Output 1 drives fan PWM controller enable line. Use Value: 80-ns latency allows sub-microsecond reaction to thermal excursions; 5-V operation matches system logic domain. |
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), lower supply current (0.4 mA), no dual-supply support - operates only from 2–36 V single supply. | Not suitable for ±15-V analog front-ends or sub-100-ns timing-critical detection; better for low-power battery systems. | Select LM393DR only when speed is non-critical and ultra-low quiescent current is required. |
| TL331IDBVR | Single comparator, 200-ns response, rail-to-rail input, 60-µA supply current - lacks second channel and dual-supply capability. | Requires two devices to replicate LM319AM's dual functionality; unsuitable for space-constrained window detection designs. | Choose TL331IDBVR only for single-threshold, low-voltage (1.8–5.5 V), ultra-low-power applications where board area permits duplication. |
Compared with LM393DR and TL331IDBVR, the LM319AM uniquely combines dual-channel architecture, 80-ns speed, ±15-V operation, and 25-mA sink strength - making it irreplaceable in precision industrial timing and relay-driving roles where these parameters are simultaneously mandatory.
Availability
LM319AM is available at Aetrix Electronics and suitable for industrial power monitoring, relay interface, analog threshold detection, and window comparator applications requiring stable component supply across extended production lifecycles.
Supply support for LM319AM 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 90 years of innovation in precision analog ICs.
The LM319AM belongs to TI's legacy high-speed comparator product line, engineered specifically for industrial control, power management, and instrumentation systems demanding speed, accuracy, and robust dual-supply operation.
FAQ
What is the maximum supply voltage for LM319AM?
The LM319AM supports a total supply voltage up to 36 V, with absolute maximum ratings specifying +18 V on V+ and –18 V on V−. Operation at ±15 V is fully characterized and recommended; exceeding ±15 V risks violating input voltage limits (±13 V common-mode range) and may degrade reliability. The LM319AM datasheet (SNOSBJ2B) explicitly prohibits operation above 16 V between ground and either supply rail.
Does LM319AM support single-supply operation?
Yes, the LM319AM operates from a single 5-V supply with V− connected to ground and V+ tied to +5 V. Input common-mode range is specified as 1–3 V under this condition, and output saturation voltage remains ≤0.4 V at 3.2 mA sink current. This configuration is fully characterized in Section 5.5 of the TI SNOSBJ2B datasheet and validated for use in 5-V logic-compatible systems.
What is the input offset voltage specification for LM319AM?
The LM319AM - as part of the LM319A grade - has a maximum input offset voltage of 2 mV at TA = 25°C, with typical value of 1 mV. This is tighter than the standard LM319 (8 mV max) and reflects the "A" suffix designation for improved precision. The specification applies across the full 0°C to +70°C operating range and is measured with source resistance ≤5 kΩ.
Can LM319AM drive a relay directly?
Yes, the LM319AM can directly drive a relay coil rated for ≤25 mA at ≤15 V, using its open-collector output stage. With V+ = 15 V and a 600-Ω relay coil, the device sinks ~25 mA while maintaining saturation voltage ≤1.5 V (per Section 5.5, TA = 25°C). A flyback diode must be placed across the coil to suppress inductive kickback and protect the output transistor.
What package type is used for LM319AM?
The LM319AM is supplied exclusively in the SOIC-14 (D) package: 8.75 mm × 3.91 mm body, 1.27-mm lead pitch, 1.75-mm max height, with matte tin (SN) lead finish and RoHS compliance. This is confirmed in TI's Package Option Addendum (SNOSBJ2B, p. 13) and distinguishes it from through-hole variants like LM319N (PDIP-14) or LM119H (TO-100-10).
LM319AM 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
- :
- 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
LM319AM FAQ
1.How can I place an order for LM319AM through Aetrix?
Please submit a Request for Quotation (RFQ) for LM319AM 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 LM319AM reliable?
The price and inventory of LM319AM are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LM319AM is usually 5 days.
3.What payment methods are accepted for LM319AM?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LM319AM transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LM319AM?
LM319AM orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LM319AM 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 LM319AM?
For technical support, including LM319AM datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LM319AM requirements.
6.How does Aetrix verify that LM319AM is sourced from the original manufacturer or authorized distributors?
All LM319AM 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 LM319AM meets industry standards.
7.What is the process for return or replacement of LM319AM?
All LM319AM units undergo pre-shipment inspection (PSI). If there is an issue with LM319AM, 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 LM319AM part is unused and in its original packaging.
Return procedure for LM319AM:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
LM319AM Tags
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LM2903DR
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LM339DR
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LM339PWR
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LM393DT
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LM2901PWR
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LM2903DT
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LM393DR
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LM239DR
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LM339APWR
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LM2903P
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LM393ADR
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NCX2200GMAZ
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