LT319AH - Dual Open-Collector Comparator | Analog Devices
MPN： LT319AH ✓ 啟用中LT319AH 概覽
A comparator is an analog integrated circuit that compares two input voltages and produces a digital logic state indicating whether the non-inverting input is above or below the inverting input. The LT319AH belongs to the dual-comparator hierarchy, combining two similar channels in one package. Its open-collector outputs require an external pull-up resistor when the output must rise to a defined logic high.
Verified product information describes the LT319AH as an improved relative to the LM119 family, with lower input offset voltage and offset current, higher voltage gain, guaranteed common-mode rejection, and input protection diodes. The identified response time is 80 ns, while one distributor result reports 150 nA input bias current. These features support applications that require fast decisions, predictable offset behavior, and protection at the inputs.
The LT319AH is produced under the Analog Devices product family and has a listed starting price of $3.23 on the official product page. Commercial-grade operation from 0°C to 70°C supports cost-sensitive industrial and instrumentation designs when that temperature range is acceptable. Its through-hole TO-5 package is mechanically straightforward for legacy PCBs, test fixtures, and hand-assembled prototypes.
Typical circuit roles include dual-threshold detection, pulse-width or timing comparison, low-level digital interfacing, and two-channel sensing. Because the outputs are open collector, designers should verify pull-up voltage, pull-up resistance, sink-current capability, input common-mode limits, and supply polarity before implementation. The separate ground arrangement should also follow the manufacturer’s connection guidance.
For new layouts, a surface-mount alternative may be mechanically easier to automate, but changing packages requires a PCB redesign. For repair and legacy production, keeping the original TO-5 footprint and verifying the 10-pin connection order is more important than selecting a merely similar dual comparator.
This page consolidates verified manufacturer information, distributor availability references, pricing context, package details, and practical procurement guidance for engineers evaluating the LT319AH. It does not infer a drop-in replacement where the provided evidence does not establish one.
直接替換替代品，適用於 LT319AH — 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： LT319AH （相同外形與佔位） — 差異在於 Package.
LT319AH
✅ 直接替換聯絡詢價
查看資料表 →LT319A
✅ 直接替換📋 參考替代品（不在目錄中）
LM319H
✅ 直接替換📋 參考替代品（不在目錄中）
8601401IA
✅ 直接替換📋 參考替代品（不在目錄中）
LM219H
✅ 直接替換📋 參考替代品（不在目錄中）
LT319AH 最大額定值與電氣特性
| Comparator Type | Dual comparator |
| Number of Channels | 2 channels |
| 輸出類型 | Open collector |
| Technology | Bipolar |
| Minimum Total Supply Voltage | ±2.5 V |
| Maximum Total Supply Voltage | ±15 V |
| Typical Dual Supply Voltage | ±3 V, ±5 V, ±9 V, or ±12 V |
| Response Time | 80 ns |
| Voltage Gain | 92.04 dB |
| Input Offset Voltage | 1 mV |
| Input Bias Current | 150 nA |
| 供應電流 | 4.3 mA |
| 工作溫度 | 0°C to 70°C |
| Temperature Grade | Commercial |
| 封裝 | 10-pin TO-5 through-hole package |
| Terminal Count | 10 terminals |
| 安裝類型 | Through hole |
| Input Protection | Input protection diodes |
LT319AH 10-pin to-5 through-hole package 腳位配置指南
LT319AH（10-pin to-5 through-hole package 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： LT319AH.
請參閱 資料表 以查看完整腳位配置。
典型應用
LT319AH 適用於 8 應用s: Dual Threshold Detection, Pulse-Width Monitoring, Legacy Interface Isolation, Power-Supply Fault Detection, Sensor Limit Alarms, Test and Measurement Equipment, Line Receivers and Logic Interfaces, Audio and Control Signals.
Dual Threshold Detection
The LT319AH fits dual-threshold detection because it combines two bipolar comparators with an identified 80 ns response time and 92.04 dB voltage gain. Each channel can compare a sensor or signal against its own reference and indicate whether the input is above or below the threshold. Open-collector outputs permit wired-interface signaling when suitable pull-up resistors are installed. The 1 mV offset specification and 150 nA bias-current figure should be checked against signal-source impedance and temperature drift. The commercial 0°C-to-70°C range is adequate for room-controlled equipment but not extended industrial environments without further qualification.
推薦
Pulse-Width Monitoring
The LT319AH can generate fast decisions for pulse-width and timing supervision, with its verified 80 ns response time providing useful speed margin around digitally or analog-generated waveforms. Two independent channels can monitor complementary pulse edges or separate timing windows. Because the outputs are open collector, external pull-ups define the high state and their RC values can materially affect edge rate. The 92.04 dB gain helps resolve small crossings, while the 1 mV input-offset value must be included when the smallest pulse amplitude approaches the comparator threshold.
推薦
Legacy Interface Isolation
The LT319AH suits legacy interface isolation when an existing 10-pin TO-5 board expects two bipolar comparators with open-collector outputs. The part can bridge a low-level analog condition to open-collector logic while retaining the verified ±2.5 V-to-±15 V dual-supply scope and 0°C-to-70°C commercial grade. Repair engineering should verify all ten pins against the official family datasheet before assembly. The through-hole package also simplifies inspection and socket-level replacement on older instrumentation, although obsolete sockets and unavailable alternates may dominate the service risk.
推薦
Power-Supply Fault Detection
The LT319AH can supervise positive or negative rail conditions by comparing divided supply voltages with references and driving fault indicators through open-collector outputs. Its 80 ns response time supports prompt fault signaling, while the commercial temperature range covers typical indoor equipment. Two channels can monitor separate rails or provide complementary fault indication. The designer must verify the actual common-mode input range, output pull-up voltage, and sink-current limit from the manufacturer data; those specifications were not included in the supplied snippets and must not be inferred.
推薦
Sensor Limit Alarms
The two LT319AH channels can monitor independent sensor outputs and generate open-collector alarms when values cross separate setpoints. The reported 150 nA input bias current is relevant when the sensing node has high source resistance, and the 1 mV offset influences alarm accuracy near the threshold. Use the comparator with suitable pull-up resistors and verify input protection requirements under fault conditions. Its commercial 0°C-to-70°C specification fits controlled test equipment and enclosure temperatures, but not wide-range outdoor or automotive use without an alternate device.
推薦
Test and Measurement Equipment
The LT319AH is appropriate for laboratory and electronic test fixtures that require two high-gain, fast comparison channels. Its 80 ns response time and 92.04 dB gain support decisions on rapidly changing test nodes, while the through-hole 10-pin TO-5 package supports serviceable instrument construction. Open-collector outputs can trigger front-panel lamps, relay drivers, or logic inputs when pulled up appropriately. The design must account for the 1 mV offset, 150 nA bias current, 4.3 mA supply-current figure, and 0°C-to-70°C commercial rating during calibration.
推薦
Line Receivers and Logic Interfaces
The LT319AH can serve as a line receiver when a differential or single-ended signal must be translated into an open-collector logic state. Two channels support dual-line or complementary signaling, and the verified bipolar technology and 92.04 dB gain help detect small polarity changes. External pull-up resistors determine the output-high voltage and switching speed, so they must match the connected logic family. Before using it on a new bus, verify the target LT319AH datasheet’s input common-mode limits, output sink current, noise behavior, and supply sequencing requirements.
推薦
Audio and Control Signals
The LT319AH can detect control or audio-related thresholds where fast, high-gain comparison is useful but a linear audio output is not required. One channel may detect an envelope or control crossing while the other monitors a complementary event, with open-collector outputs feeding relays, logic, or indicator circuits. The supplied information does not establish input noise density, rail-to-rail operation, or audio-specific common-mode limits, so this use is limited to signals known to remain within the official electrical characteristics and away from unsupported regions.
推薦
推薦產品摘要
工程參考資料，適用於 LT319AH — 比較、設計指引及合規資訊。
選型指南
主要差異化特點
- Fast dual-channel decision function (對比LT319A)
- Improved LM119-family offset and gain behavior (對比LM119)
- Commercial through-hole implementation (對比Surface-mount dual comparators)
設計說明
Do not treat the open-collector output as a push-pull logic driver. Every output needs a correctly chosen pull-up resistor unless another device on the bus provides one. Verify pull-up voltage, resistor value, sink-current margin, bus capacitance, and required rise time. The supplied snippets do not provide the complete output-current or common-mode tables, so use the official family datasheet before sizing the network or committing to a legacy board.
Design the dual supply for the comparator’s actual input and output ranges rather than the ±15 V maximum alone. The verified data supports ±2.5 V through ±15 V dual supplies, but input signals must remain within the manufacturer’s common-mode limits. Include local supply bypassing and account for the listed 4.3 mA supply-current figure plus output pull-up current. Grounding and supply sequencing should follow the family datasheet because the part uses a separate ground arrangement.
For threshold sensing, calculate the total error from the reported 1 mV input offset, reference tolerance, noise, temperature drift, and source-node error. The listed 150 nA bias current creates a voltage shift across source resistance; Estimated: a 100 kΩ source would produce about 15 uV of bias-current drop using I × R, while the supplied 1 mV offset remains the larger specified term unless another source contributes materially.
Preserve the original 10-pin TO-5 footprint for repair work and inspect lead oxidation, socket integrity, solder bridges, and pin-1 orientation before energizing the board. Because the supplied search snippets do not include the individual pin assignments, wire from the official Analog Devices connection diagram rather than a third-party outline. Keep comparator input traces short, separate from high-current switching paths, and return output pull-up current through a ground path that does not share sensitive threshold returns.
合規資訊
The supplied product snippets do not state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The verified temperature grade is commercial, but that does not by itself establish automotive qualification.
