LT319AN - Dual 80ns Comparator, 14-PDIP | Analog Devices
MPN: LT319AN ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $3.23 | $3.23 |
| 10 | $3.23 | $32.30 |
| 100 | $3.23 | $323.00 |
| 500 | $3.23 | $1,615.00 |
| 1,000 | $3.23 | $3,230.00 |
LT319AN Overview
A comparator is an integrated circuit that compares two input voltages and produces a logic-level output indicating which input is higher. As a dual comparator, the LT319AN contains two independent comparison channels in one package. This dual-channel structure places the device in the comparator hierarchy: comparator > analog comparator > linear integrated circuit > semiconductor. It is useful when a system needs fast threshold detection, signal conditioning, or differential logic conversion.
The LT319A family is described by Analog Devices as an improved version of the LM119 dual comparator. Its key advantages include lower input offset voltage and offset current, higher voltage gain, guaranteed common-mode rejection, and input protection diodes. The maximum 0.5 mV offset specification reduces ambiguity near the switching threshold, while the 80 ns response time supports high-speed decision-making. The 25 mA output drive capability allows the outputs to interface with suitable TTL-compatible circuitry.
Operation from a single 5 V supply simplifies the power architecture in TTL and mixed-signal systems. The 14-pin PDIP package also supports conventional through-hole assembly and prototyping. Because output behavior and input common-mode limits depend on the supply configuration, designers should consult the manufacturer datasheet before using the device outside its stated operating conditions. The separate ground arrangement discussed for the LT319A family can also assist system-ground isolation where applicable.
Typical uses include high-speed threshold detection, pulse-width and timing measurements, zero-cross detection, signal conditioning, and two-channel sensing. One comparator channel can compare a sensor signal with a reference while the other performs an independent threshold or differential decision. The fast 80 ns response helps minimize propagation delay in timing-sensitive systems, and the 0.5 mV maximum input offset improves threshold repeatability.
Layout should keep input and output paths short, provide a stable return path, and avoid routing sensitive input traces beside high-current switching nodes. Input protection diodes require attention when signals can exceed the supply rails. Designers should also account for output rise and fall time, supply bypassing, and input common-mode range when interpreting the 80 ns response specification.
This page combines the verified manufacturer and distributor information with practical application guidance, sourcing details, comparison data, and design notes. It distinguishes explicitly verified LT319AN characteristics from parameters that still require confirmation from the official LT319A datasheet.
Drop-in alternatives for LT319AN — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with LT319AN (same form factor and footprint) — differing in Comparator Type, Mounting Type, Number of Channels, Package.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
LT319AN#PBF
✅ Drop-In✓ In Stock
$3.23 / Unit
View Datasheet →LT119AN
✅ Drop-In📋 Reference alternative (not in catalog)
LT1016AN
✅ Drop-In📋 Reference alternative (not in catalog)
MAX942N
✅ Drop-In📋 Reference alternative (not in catalog)
MAX912N
✅ Drop-In📋 Reference alternative (not in catalog)
LT319AN Maximum Ratings & Electrical Characteristics
| Comparator Type | Dual general-purpose comparator |
| Number of Channels | 2 channels |
| Maximum Input Offset Voltage | 0.5 mV |
| Response Time | 80 ns |
| Output Drive Capability | 25 mA |
| Single-Supply Operation | 5 V |
| Output Type | Open-collector, open-emitter, TTL-compatible |
| Input Protection | Input protection diodes |
| Package | 14-pin PDIP |
| Mounting Type | Through-hole |
LT319AN 14-pin pdip Pin Configuration Guide
Pin configuration for LT319AN (14-pin pdip package). This analog component features input, output, and power supply pins. Refer to the manufacturer datasheet for offset null, compensation, and enable pin configurations. Ideal for signal conditioning and amplifier circuits.
No detailed pinout data available for LT319AN.
Refer to the datasheet for full pin configuration.
Typical Applications
LT319AN is suitable for 6 applications: High-Speed Threshold Detection, Pulse-Width and Timing Measurement, Zero-Cross Detection, TTL Logic Signal Conditioning, Industrial Sensor Interfacing, Power-Sequencing and Rail Monitoring.
High-Speed Threshold Detection
The LT319AN fits threshold-detection stages that require fast propagation and repeatable comparison near the reference voltage. Its verified 80 ns response time limits comparator delay, while the guaranteed maximum 0.5 mV input offset helps define a narrow decision band around the threshold. Two independent channels can monitor two signals or provide redundant decisions on the same board. The open-collector/open-emitter outputs need the correct pull-up arrangement for TTL-compatible interfacing, and input excursions beyond the supply rails require external protection because the device includes input protection diodes.
Recommended
Pulse-Width and Timing Measurement
The LT319AN can compare a timing signal against a generated reference to determine whether a pulse or interval exceeds a defined threshold. The 80 ns response time is valuable when timing edges must be detected quickly, and the 0.5 mV maximum offset helps maintain a stable comparison boundary when the relevant signal is a voltage rather than a logic edge. The dual architecture allows one channel to monitor the event while the second handles a complementary limit or another timing phase. Board design should minimize comparator input capacitance and return lead inductance because these effects can add delay beyond the specified response time.
Recommended
Zero-Cross Detection
The LT319AN is suitable for detecting the transition of an analog waveform through zero or another defined reference. Its fast 80 ns response reduces the delay between the input crossing and the resulting logic transition, while the maximum 0.5 mV offset defines the accuracy of the comparison region. The two channels can monitor positive and negative crossings, or one channel can provide a second decision or alarm. Designers should preserve a low-noise reference path, avoid placing the input beside switching-current traces, and account for input protection behavior if the source can exceed the comparator supply limits.
Recommended
TTL Logic Signal Conditioning
The LT319AN can translate analog thresholds into TTL-compatible logic because the verified distributor data identifies open-collector, open-emitter, TTL operation and the family data specifies 25 mA output drive capability. Its 0.5 mV maximum input offset is useful when converting a carefully controlled analog level into a dependable binary decision, and its 80 ns response supports higher-speed logic interfaces. The output topology requires the correct pull-up resistor and return path. Engineers should also verify the allowed output voltage, sink current, input common-mode range, and supply limits in the official datasheet.
Recommended
Industrial Sensor Interfacing
The LT319AN can compare a conditioned industrial sensor signal with a reference to produce a discrete limit, alarm, or control event. Its dual-channel architecture allows two thresholds to be evaluated without using two packages, and the 80 ns response is generally sufficient for rapid discrete decisions. The 0.5 mV maximum input offset is meaningful only if the upstream sensor and reference paths do not introduce more error, so input conditioning and grounding remain important. For industrial use, verify the LT319AN operating-temperature rating, supply limits, and applicable qualification because those values were not included in the supplied snippets.
Recommended
Power-Sequencing and Rail Monitoring
The LT319AN can evaluate a divided power rail against a reference and report whether the rail is above or below a selected threshold. The two channels permit monitoring of two rails or supplying complementary conditions, while the 80 ns response supports prompt transitions during startup or fault events. A controlled reference source and low-impedance divider are necessary because resistor tolerance and input offset can affect the actual trip point. Output pull-up selection must preserve valid TTL-compatible levels, and any monitored signal exceeding the comparator supply range requires external attenuation or clamping.
Recommended
Recommended Products Summary
Engineering reference data for LT319AN — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | LT319AN#PBF | LT119AN | LT1016AN | MAX942N | MAX912N |
|---|---|---|---|---|---|---|
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Package | 14-PDIP | 14-PDIP - same | 14-PDIP - same | 14-PDIP - same | 14-PDIP - same | 14-PDIP - same |
Key Differentiators
- Fast verified response with tight offset (vs MAX912N)
- Dual channels in one 14-pin PDIP (vs LT1016AN)
- Improved LT319A family positioning versus LM119 (vs LM119)
- Explicit TTL-compatible open output interface (vs MAX942N)
Design Notes
Keep the two comparison inputs short and symmetric, and provide a nearby ground return so input switching cannot add meaningful error to the decision. The guaranteed maximum input offset is only 0.5 mV, so resistor noise, reference drift, leakage, and ground bounce can dominate the effective accuracy. Avoid routing either input beneath or parallel to a high-current switching path. Where a slow reference is used, confirm that its settling behavior meets the system timing requirement rather than relying only on the comparator's 80 ns response specification.
The LT319AN is verified for operation from a single 5 V supply, and the broader electrical limits must be taken from the official LT119A/LT319A datasheet. Place the required supply-decoupling capacitor close to the device's supply and ground pins, with a short and sufficiently wide return path. Because the output is open-collector/open-emitter, select the pull-up voltage and resistor from the output-current, logic-level, and system-noise requirements. Changing the pull-up voltage can affect rise time and therefore total decision delay even when the 80 ns intrinsic response is unchanged.
Do not assume that 25 mA output drive is permissible under every pull-up or supply condition. Check sink current, output voltage, output-current limits, and input protection behavior against the manufacturer data. An input signal that can rise above or fall below the allowed common-mode range may forward-bias the input protection diodes and disturb the reference or source. Add series resistance or clamping where needed, and verify the numbered 14-pin PDIP pinout directly from the official PDF before laying out the PCB.
Place the part close to the source and destination of each decision to minimize trace delay and susceptibility to interference. Keep output pull-up resistors close enough to the comparator to form a compact, low-inductance output loop, while maintaining separation between the pull-up return and sensitive input reference. Use a ground plane or uninterrupted return path rather than routing ground through the output current path. The PDIP package supports easy prototyping and inspection, but through-hole lead inductance can add delay compared with a suitable surface-mount implementation.
Compliance Information
The supplied verified pages establish the LT319A family, a 14-PDIP package, and an LT319AN#PBF ordering option, but they do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for the exact LT319AN ordering code. The #PBF suffix is recorded in the verified listings but is not treated as proof of compliance without the corresponding manufacturer declaration.