LT319AN#PBF - 80ns Dual Comparator, 14-PDIP | Analog Devices
MPN： LT319AN#PBF ✓ 啟用中LT319AN#PBF 概覽
A comparator is a high-gain analog signal-conditioning IC that evaluates two input voltages and produces a digital logic result indicating which input is higher. The LT319A belongs to the comparator hierarchy, which supports general-purpose analog and mixed-signal systems: comparator -> analog signal IC -> integrated circuit -> semiconductor. Its open-collector output requires an external pull-up resistor and can interface with systems using open-collector, open-emitter, or TTL-compatible signaling.
Key features include two comparators per package, an 80 ns response time, a guaranteed maximum 0.5 mV input offset voltage, and 25 mA output drive capability. The single 5 V operating capability is useful for low-voltage logic systems, while the ±15 V supply capability supports higher-voltage analog and industrial control circuits. Input protection diodes help limit input stress, although external protection and supply-decoupling checks remain necessary in the final design.
The LT319A architecture is intended for threshold detection, level translation, pulse generation, and high-speed switching decisions. Because the outputs are open collector, the output high level depends on the pull-up network and system voltage rather than an internal active pull-up. This makes the device adaptable to different logic families, but it also requires correct resistor selection and confirmation that the driven node meets the timing and current requirements of the receiving circuit.
Typical applications include industrial control and automation, sensor threshold detection, pulse-width and timing circuits, level conversion, waveform conditioning, and embedded control systems. The 14-pin PDIP package is mechanically straightforward for through-hole assembly, prototyping, and repair. Its dual-channel configuration also reduces package count when two independent decisions are required in one circuit.
When designing around the LT319AN#PBF, verify supply polarity, common-mode input limits, output pull-up values, and the maximum transition rate required by the downstream logic. Place bypass capacitors close to the supply pins and keep comparator input traces short to reduce noise pickup. The open-collector outputs can pull a logic node low but cannot source current, so a suitable pull-up resistor is mandatory.
This page combines verified manufacturer and distributor data with practical comparator design guidance, application fit, package information, and drop-in replacement considerations for engineers evaluating the LT319AN#PBF.
直接替換替代品，適用於 LT319AN#PBF — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： LT319AN#PBF （相同外形與佔位） — 差異在於 Comparator Type, Mounting Type, Number of Channels, Package.
LT319AN
✅ 直接替換聯絡詢價
查看資料表 →LT119AN#PBF
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM319N/NOPB
✅ 直接替換📋 參考替代品（不在目錄中）
LT119AN
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
LM319N
✅ 直接替換📋 參考替代品（不在目錄中）
LT319AN#PBF 最大額定值與電氣特性
| Comparator Type | General Purpose |
| Number of Comparators | 2 |
| Response Time | 80 ns |
| IC Output Type | Open Collector |
| Output Compatibility | Open-Collector, Open-Emitter, TTL |
| 供應電流 | 8 mA |
| Supply Voltage Range | 5 V to ±15 V |
| Maximum Input Offset Voltage | 0.5 mV |
| Output Drive Capability | 25 mA |
| Input Protection | Input protection diodes |
| Number of Channels | 2 |
| 封裝 | 14-PDIP |
| 安裝類型 | Through Hole |
| Comparator Class | Dual precision comparator |
| Single-Supply Operation | 5 V |
| Output State | Open collector with external pull-up required |
LT319AN#PBF 14-pdip 腳位配置指南
LT319AN#PBF（14-pdip 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： LT319AN#PBF.
請參閱 資料表 以查看完整腳位配置。
典型應用
LT319AN#PBF 適用於 6 應用s: Industrial Automation Threshold Detection, Pulse and Timing Control, Level Translation and Logic Interfacing, Sensor Signal Conditioning, Waveform Shaping and Edge Detection, Embedded Control and Instrumentation.
Industrial Automation Threshold Detection
The LT319AN#PBF fits industrial threshold-detection circuits that need two independent decisions in one through-hole package. Its verified 80 ns response time allows the comparator to react quickly when a sensor or control signal crosses a reference level, while the maximum specified 0.5 mV input offset helps keep the switching point close to the intended threshold. Use each open-collector output with an appropriate pull-up resistor so the result can drive a controller input or logic node. The main design consideration is confirming the input common-mode range at the actual supply voltage and keeping sensor traces away from switching power nodes.
推薦
Pulse and Timing Control
The LT319AN#PBF is suitable for pulse-width, edge, and timing control because its dual-channel architecture provides two comparator decisions without requiring two separate packages. The verified 80 ns response time is useful when the circuit must make a fast decision around a reference ramp or timing node, and the 25 mA drive capability supports current transitions at the output pull-up network. Because the outputs are open collector, choose the pull-up value to balance sink current against the required rise time. Confirm downstream receiver limits and avoid excessive capacitance on timing-critical output nodes.
推薦
Level Translation and Logic Interfacing
The LT319AN#PBF can support level translation when a system needs a comparator-defined logic result rather than a fixed-voltage buffer. Its open-collector output can be pulled up to the voltage required by the receiving logic, making the interface flexible across open-collector, open-emitter, and TTL-compatible arrangements identified in the verified data. The 8 mA supply-current specification helps define the power budget, but the pull-up resistor determines the output high level and rise time. Verify absolute maximum voltage, input limits, and output sink-current requirements against the complete manufacturer datasheet before production use.
推薦
Sensor Signal Conditioning
The LT319AN#PBF can turn a conditioned sensor signal into a clean digital event when the application needs fast thresholding. Its two comparators allow complementary or independent sensor decisions, and the specified 0.5 mV maximum input offset provides a useful starting point when defining the switching threshold. The open-collector outputs are convenient for wired alarm or interlock signals because the node can be pulled up to the system logic voltage. For noisy sensor environments, use shielding, filtering, and short comparator input traces; also verify that the sensor signal remains inside the permitted common-mode range.
推薦
Waveform Shaping and Edge Detection
The LT319AN#PBF is appropriate for waveform shaping when a clean digital transition is needed from a bipolar or single-supply analog waveform. Its verified 80 ns response time supports rapid edge decisions, while the dual-channel configuration can detect both rising and falling events or compare two independent signal levels. The output is open collector, so an external pull-up resistor is required and its value controls the output rise time. Keep the input network short, use appropriate source impedance, and check comparator input protection limits when the source can overshoot the supply rails.
推薦
Embedded Control and Instrumentation
The LT319AN#PBF can support embedded instrumentation, measurement, and control loops that require fast binary decisions around analog thresholds. The dual comparator package reduces board-space requirements compared with two separate single comparators, and the 14-PDIP format is useful for prototypes and repairable through-hole assemblies. The 0.5 mV maximum specified offset is meaningful for close-threshold measurement, but system accuracy also depends on the reference, resistor tolerances, noise, and input filtering. Use a clean reference and decouple the supply close to the device before interpreting small threshold differences.
推薦
推薦產品摘要
工程參考資料，適用於 LT319AN#PBF — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | LT319AN | LT119AN#PBF | LM319N/NOPB | LM319N |
|---|---|---|---|---|---|
| Number of Comparators | 2 | 2 | 2 | 2 | 2 |
| Package | 14-PDIP | 14-PDIP | 14-PDIP | 14-PDIP | 14-PDIP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments | Texas Instruments |
主要差異化特點
- Dual comparator in one through-hole package (對比LM319N/NOPB)
- Verified fast response time (對比LM319N/NOPB)
- Single-supply and bipolar-range flexibility (對比LT319AN)
設計說明
The LT319AN#PBF output is open collector, so a pull-up resistor is required on each output used as a logic signal. Do not treat the output as a push-pull driver. Select the resistor to balance output sink current, receiver input current, node capacitance, and the required rise time. Verify that the downstream device accepts the pulled-up voltage and that the comparator can sink the maximum current during a low output state.
Place the bypass capacitor close to the comparator supply pins and keep input traces short, especially when the threshold difference is small. Route sensitive comparator inputs away from switching nodes, relay contacts, power inductors, and high-current return paths. A compact ground return helps reduce noise pickup and prevents the input offset specification from being degraded by board-level interference.
Before applying power, check the selected supply arrangement against the verified 5 V to ±15 V range and the complete datasheet’s input and output absolute maximum limits. The verified supply current is 8 mA, but total current also includes pull-up current and the load driven by each open-collector output. Estimate worst-case dissipation and ensure the 14-PDIP through-hole package is not placed next to a heat source without adequate airflow.
For fast threshold decisions, minimize input capacitance and use a stable reference source. The verified 80 ns response time does not remove the need to account for propagation delay, reference settling, pull-up RC time, and downstream receiver delay. Use an oscilloscope to verify the complete decision path when the output timing or switching threshold is critical.
合規資訊
The supplied verified snippets identify the LT319AN#PBF and LT319A family but do not provide RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The part is an analog comparator IC, so AEC-Q100 is treated as not applicable rather than qualified.
