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Analog Devices Inc. LT319AN#PBF
- Part No.:
- LT319AN#PBF
- Manufacturer:
- Analog Devices Inc.
- Category:
- Comparators
- Package:
- 14-DIP (0.300", 7.62mm)
- Datasheet:
-
LT319AN#PBF.pdf
- Description:
- IC COMPARATOR 2 GEN PUR 14DIP
- Quantity:
- Payment:
- Shipping:
Inventory:164
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Product details
Overview
LT319AN#PBF from Analog Devices (formerly Linear Technology) is a dual high-speed comparator IC with open-collector outputs, designed for precision window detection and fast signal conditioning in industrial and instrumentation systems. It features 0.5mV max input offset voltage, 80ns response time, ±15V or single 5V supply operation, and 25mA output sink capability per channel.
For engineers reviewing the LT319AN#PBF datasheet, LT319AN#PBF pinout, LT319AN#PBF application, or LT319AN#PBF equivalent, key selection criteria include guaranteed input offset voltage over temperature, common-mode rejection ratio, output drive strength under TTL/CMOS load conditions, and compatibility with single-supply 5V systems requiring ground isolation via dedicated GND2 pin.
Technical Context
The LT319AN#PBF implements two independent comparators with internal input protection diodes and rail-to-rail common-mode input range up to ±13V with ±15V supplies or 1V–3V with 5V single supply. Its architecture supports window detector configurations using external resistive dividers and enables direct TTL-level interfacing via open-collector outputs pulled to V+ or separate logic rails.
Each comparator features matched input bias current (≤500nA), high DC gain (≥20 V/mV), and guaranteed common-mode rejection ratio ≥90dB across the full 0°C to 70°C operating range - critical for stable threshold detection in noisy environments such as motor control feedback or power supply monitoring.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Offset Voltage | 0.5 mV max at TA = 25°C; ensures ≤1 LSB error in 10-bit ADC reference comparators |
| Response Time | 80 ns for 100 mV step with 5 mV overdrive; supports >10 MHz pulse discrimination |
| Output Sink Current | 25 mA per channel; drives standard TTL loads or relays without external buffers |
| Supply Range | Single 5V or dual ±15V; enables flexible integration into mixed-voltage systems |
| Common-Mode Rejection | ≥90 dB over full temperature range; maintains accuracy despite ground noise up to 100 mVpp |
| Input Protection | Integrated ±5V zener diodes; eliminates need for external clamping in transient-prone inputs |
| Operating Temperature | 0°C to 70°C; qualified for commercial-grade embedded control and test equipment |
Pinout & Package
LT319AN#PBF is housed in a 14-lead plastic DIP (N package) with 0.300-inch width, JEDEC MS-001 compliant, rated for θJA = 100°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 13, 14 | No Connect | Unused pins; must remain unconnected per datasheet to avoid parasitic coupling |
| 3, 12 | GND / GND2 | Dedicated system ground isolation; allows separation of analog and digital return paths |
| 4, 11 | +INPUT 1 / +INPUT 2 | Non-inverting inputs; accept common-mode voltages up to ±13V (±15V supply) |
| 5, 10 | –INPUT 1 / –INPUT 2 | Inverting inputs; protected by back-to-back 5.6V zeners limiting differential input to ±5V |
| 6 | V– | Negative supply rail; supports dual-supply operation down to –15V |
| 7, 9 | OUTPUT 2 / OUTPUT 1 | Open-collector outputs; require external pull-up to V+ or logic rail for active-high signaling |
| 8 | V+ | Positive supply rail; accepts 5V single supply or up to +15V in dual-supply mode |
Key Features
| Feature | Design Value |
|---|---|
| Guaranteed low input offset | 0.5 mV max ensures <0.1% threshold error in 5V window detectors |
| Independent ground pin (GND2) | Enables isolation between comparator section and system ground plane |
| 25 mA output sink per channel | Directly drives LEDs, small relays, or TTL logic without external transistors |
| 80 ns propagation delay | Supports high-speed zero-crossing detection in 50/60 Hz sync circuits with <1 µs jitter |
| Input protection diodes | Eliminates need for external TVS or series resistors in industrial I/O interfaces |
Applications
| Window Detector | Relay/Lamp Driver |
|---|---|
Use Scenario: Monitoring battery voltage in automotive accessory modules to trigger under-voltage lockout and over-voltage shutdown. IC Role / Device Role / Timing Role: Dual comparator configures upper and lower thresholds; outputs drive logic enable lines for power FETs. Use Value: Guaranteed 0.5 mV offset ensures ±10 mV threshold accuracy over temperature, preventing false trips during cold cranking. | Use Scenario: Controlling indicator lamps and solenoid valves in PLC I/O modules with 24V DC field power. IC Role / Device Role / Timing Role: Comparator compares sensor signal against fixed reference; open-collector output sinks 25 mA to energize lamp or relay coil. Use Value: Direct 25 mA drive eliminates buffer transistor, reducing BOM count and PCB area in space-constrained DIN-rail mounts. |
| High-Speed One-Shot | Voltage-Controlled Oscillator |
Use Scenario: Generating precise 20 ns–1 µs pulses in test equipment timing generators based on analog trigger levels. IC Role / Device Role / Timing Role: Fast comparator edge detection triggers monostable multivibrator; 80 ns response enables sub-100 ns pulse jitter. Use Value: 80 ns propagation delay and low input hysteresis (<1 mV) ensure deterministic pulse width control across 0–70°C. | Use Scenario: Building tunable crystal oscillators with 100 ppm trim range for frequency synthesis in communication subsystems. IC Role / Device Role / Timing Role: Comparator acts as limiter and phase detector in VCXO loop; input protection handles varactor tuning voltage transients. Use Value: ±5V input protection diodes tolerate 10 Vpp tuning voltage spikes without latch-up, improving long-term reliability. |
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 |
|---|---|---|---|
| LM319N#PBF | Slightly higher input offset (1 mV max), same 80 ns response, identical pinout and package | Lower cost but reduced DC precision; suitable where 0.5 mV offset is not required | Select LM319N#PBF only if design tolerates 2× offset drift and does not require guaranteed 0.5 mV spec |
| LT1719CS5#TRMPBF | Single-channel, 4.5 ns response, rail-to-rail inputs, 3V–5.5V supply only | Not pin-compatible; requires redesign for speed-critical single-comparator use cases | Choose LT1719CS5#TRMPBF when >10× speed improvement justifies layout change and single-channel architecture |
Compared with LM319N#PBF, LT319AN#PBF delivers tighter offset voltage control essential for precision window detection; versus LT1719CS5#TRMPBF, it offers dual-channel integration and wider supply flexibility at the cost of speed - making LT319AN#PBF optimal for cost-sensitive, space-constrained dual-threshold systems operating from 5V or ±15V rails.
Availability
LT319AN#PBF is available at Aetrix Electronics and suitable for industrial control panels, test instrumentation, and power supply monitoring systems requiring stable component supply with guaranteed 0°C to 70°C performance.
Supply support for LT319AN#PBF 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
Analog Devices, Inc. (acquired Linear Technology in 2017) is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors.
The LT319A product line was developed specifically for high-reliability dual-comparator applications demanding guaranteed offset voltage, fast response, and robust input protection - targeting industrial automation, medical diagnostics, and precision test equipment.
FAQ
What is the maximum supply voltage rating for LT319AN#PBF?
The LT319AN#PBF has an absolute maximum supply voltage rating of 36V across V+ and V– terminals. When operated from dual supplies, the maximum allowed voltage between V+ and V– is 36V; for single-supply use, V– must be tied to ground and V+ must not exceed 36V. Exceeding these limits risks permanent damage per Absolute Maximum Ratings table in the official datasheet.
Does LT319AN#PBF support single-supply operation at 5V?
Yes, LT319AN#PBF fully supports single 5V supply operation with V– connected to ground and V+ at 5V. Input common-mode range is specified as 1V to 3V under this condition, and output saturation voltage remains ≤0.4V at 3.2mA sink current - enabling direct interface with 5V TTL and CMOS logic families without level-shifting circuitry.
What is the purpose of the separate GND2 pin on LT319AN#PBF?
The GND2 pin (Pin 12) on LT319AN#PBF provides a dedicated ground reference for the second comparator's output stage and internal circuitry, allowing physical separation from the main system ground (Pin 3). This isolation minimizes crosstalk between comparator channels and reduces ground bounce in mixed-signal systems - especially valuable in window detector designs where both comparators monitor different voltage domains.
Can LT319AN#PBF drive a 500Ω load directly?
Yes, LT319AN#PBF can drive a 500Ω load referenced to V+ (i.e., pull-down configuration) with ≤0.75V saturation voltage at 25mA sink current when V+ ≥ 4.5V and V– = 0V. This meets standard TTL fan-out requirements and enables direct driving of logic gates, small relays, or LED indicators without external buffering components.
Is LT319AN#PBF pin-compatible with LM319N#PBF?
Yes, LT319AN#PBF is pin-compatible with LM319N#PBF in the 14-lead PDIP package: identical pin numbering, function mapping, and footprint. Both share the same NC, GND, input, output, and supply pin assignments. However, LT319AN#PBF offers improved specifications including lower input offset voltage (0.5 mV vs. 1.0 mV max) and better common-mode rejection, making it a performance upgrade within the same PCB layout.
LT319AN#PBF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Package/Case:
- 14-DIP (0.300", 7.62mm)
- Series:
- -
- Packaging:
- Tube
- Product Status:
- Active
- Type:
- General Purpose
- Number of Elements:
- 2
- Output Type:
- Open-Collector, Open-Emitter, TTL
- Voltage - Supply, Single/Dual (±):
- 5V ~ 30V, ±2.5V ~ 15V
- :
- 1mV @ ±15V
- Voltage - Input Offset (Max):
- 0.5µA @ ±15V
- Current - Input Bias (Max):
- -
- Current - Output (Typ):
- 4.3mA
- Current - Quiescent (Max):
- 106dB CMRR
- CMRR, PSRR (Typ):
- -
- Propagation Delay (Max):
- -
- Hysteresis:
- 0°C ~ 70°C
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- Through Hole
- :
- 14-PDIP
LT319AN#PBF FAQ
1.How can I place an order for LT319AN#PBF through Aetrix?
Please submit a Request for Quotation (RFQ) for LT319AN#PBF 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 LT319AN#PBF reliable?
The price and inventory of LT319AN#PBF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for LT319AN#PBF is usually 5 days.
3.What payment methods are accepted for LT319AN#PBF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for LT319AN#PBF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for LT319AN#PBF?
LT319AN#PBF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your LT319AN#PBF 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 LT319AN#PBF?
For technical support, including LT319AN#PBF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your LT319AN#PBF requirements.
6.How does Aetrix verify that LT319AN#PBF is sourced from the original manufacturer or authorized distributors?
All LT319AN#PBF 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 LT319AN#PBF meets industry standards.
7.What is the process for return or replacement of LT319AN#PBF?
All LT319AN#PBF units undergo pre-shipment inspection (PSI). If there is an issue with LT319AN#PBF, 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 LT319AN#PBF part is unused and in its original packaging.
Return procedure for LT319AN#PBF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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