LM339AM/NOPB - Low-Power Quad Comparator | Texas Instruments
MPN: LM339AM/NOPB ✓ Hoạt độngLM339AM/NOPB Tóm tắt
A voltage comparator is an analog interface IC that compares two input voltages and produces a digital-level indication of their relationship. In the signal-chain hierarchy, the LM339 belongs to the comparator family within analog and mixed-signal ICs, where it bridges low-level sensing, threshold detection, protection, and logic-level conversion. Its four independent channels allow one package to implement several sensing or protection functions without requiring four separate single-channel devices.
The principal features of the LM339AM/NOPB are its low operating power, wide supply-voltage tolerance, open-collector outputs, and broad output compatibility. Open-collector outputs can sink current and require an external pull-up resistor, allowing the output voltage to be set by the connected logic supply. The outputs are compatible with CMOS, DTL, ECL, MOS, and TTL circuits according to the manufacturer information. The 0 °C to 70 °C temperature range identifies this ordering code for commercial-temperature applications.
Each of the four channels operates independently, allowing separate reference, threshold, or protection tasks within the same package. The 1.3 µs response time is suitable for general-purpose detection rather than high-speed timing applications. The 2 mV maximum offset specification for the complete quad is important when the difference between two sensed voltages is small. A wide 2 V to 36 V operating range also supports both low-voltage logic systems and higher-voltage industrial sensing environments when the external circuit and device ratings permit.
Typical uses include power-supply sequencing, battery monitoring, sensor threshold detection, overvoltage and undervoltage indication, level translation, and simple control-loop sensing. Because the outputs are open collector, pull-up resistors are required when the outputs drive CMOS or TTL inputs. Open-collector stages can also be wired for wired-AND behavior where suitable, although the application must remain within the electrical ratings of every connected channel.
Designers should verify input common-mode range, differential voltage, supply current, and output pull-up requirements against the manufacturer datasheet before implementation. Keep sensitive comparator inputs away from switching nodes and high-current return paths, use a stable reference when threshold accuracy matters, and select resistor values that provide adequate logic-high voltage while keeping output current within the channel limit. The 14-pin SOIC package supports conventional PCB assembly, but exposed-pad or other package variants require different layouts.
Bộ thay thế dễ dàng lắp đặt cho LM339AM/NOPB — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với LM339AM/NOPB (cùng hình factor và footprint) — khác nhau ở Comparator Type, Package, Operating Temperature Range, Logic Compatibility, Supply Voltage Range.
LM339DR
✅ Drop-In✓ Còn hàng
$0.0738 / Đơn vị
Xem tài liệu →LM339DT
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM339AM
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2901D
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2901B
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM339AM/NOPB Tỷ lệ tối đa & tính chất điện
| Comparator Type | Low-power, low-offset voltage comparator |
| Number of Comparators | 4 independent comparators |
| Supply Voltage Range | 2 V to 36 V |
| Differential Input Voltage Range | ±18 V |
| Response Time | 1.3 µs |
| Input Offset Voltage | 2 mV maximum for all four comparators |
| Điện áp cung cấp | 1 mA |
| Kiểu đầu ra | Open-collector |
| Output Compatibility | CMOS, DTL, ECL, MOS, and TTL |
| Khoảng nhiệt độ hoạt động | 0 °C to 70 °C |
| Hộp | 14-pin SOIC (D) |
| Số lượng chân | 14 |
| Kiểu lắp đặt | Surface mount |
| Lead-Free Status | Lead-free NOPB ordering option |
Cấu hình chân LM339AM/NOPB
| Chân 1 | OUT 1 — Open-collector output for comparator channel 1 |
| Chân 2 | OUT 2 — Open-collector output for comparator channel 2 |
| Chân 3 | OUT 3 — Open-collector output for comparator channel 3 |
| Chân 4 | OUT 4 — Open-collector output for comparator channel 4 |
| Chân 5 | GND — Ground connection |
| Chân 6 | IN 1- — Inverting input for comparator channel 1 |
| Chân 7 | IN 1+ — Non-inverting input for comparator channel 1 |
| Chân 8 | IN 2- — Inverting input for comparator channel 2 |
| Chân 9 | IN 2+ — Non-inverting input for comparator channel 2 |
| Chân 10 | IN 3- — Inverting input for comparator channel 3 |
| Chân 11 | IN 3+ — Non-inverting input for comparator channel 3 |
| Chân 12 | IN 4- — Inverting input for comparator channel 4 |
| Chân 13 | IN 4+ — Non-inverting input for comparator channel 4 |
| Chân 14 | VCC — Positive supply connection |
Ứng dụng tiêu biểu
LM339AM/NOPB phù hợp cho 6 Áp dụngs: Industrial Sensor Threshold Detection, Power-Supply Overvoltage and Undervoltage Detection, Battery Voltage Monitoring, Logic-Level Interfacing, Motor and Solenoid Protection, Security and Access-Control Sensing.
Industrial Sensor Threshold Detection
The LM339AM/NOPB is suitable for comparing a sensor signal against a reference voltage when low offset and a wide input range are important. Its four independent channels can monitor separate temperature, pressure, level, or position sensors, while the 2 mV maximum quad offset helps resolve small signal differences. The 2 V to 36 V supply range accommodates multiple industrial signal environments, and the 1.3 µs response time is adequate for general monitoring rather than high-speed event capture. Use stable reference circuitry and route sensor inputs away from switching nodes.
Được đề xuất
Power-Supply Overvoltage and Undervoltage Detection
The LM339AM/NOPB can monitor a power rail and generate an open-collector fault indication when the voltage crosses a defined threshold. Its ±18 V differential input range and 2 V to 36 V operating range support broader supply supervision than basic low-voltage logic comparators, while the 1.3 µs response permits timely protection signaling. Place a resistor divider at the input, select a stable reference for accuracy, and pull the output up to the voltage required by the fault logic. Ensure divider power dissipation remains within component ratings.
Được đề xuất
Battery Voltage Monitoring
The LM339AM/NOPB is useful for indicating battery operating limits because four comparison channels can monitor pack voltage, charge status, or multiple thresholds. Its low 1 mA supply current helps limit overhead in battery-powered equipment, and the open-collector output can directly drive a status indicator or pull up to a low-voltage logic rail. The broad 2 V to 36 V supply range supports different battery chemistries, but the sensing divider must not discharge the source excessively. Temperature qualification and cell-specific limits should be evaluated before deployment.
Được đề xuất
Logic-Level Interfacing
The LM339AM/NOPB can bridge a higher-voltage sensing circuit to lower-voltage digital logic through its open-collector output and external pull-up resistor. Because the pull-up supply is independent, the output can settle at the voltage expected by CMOS or TTL receivers, while the comparator itself operates from a separate supply. The output compatibility list includes CMOS, DTL, ECL, MOS, and TTL. Choose a pull-up resistance that balances rise time, power consumption, and the output sink-current limit, and confirm that every connected input remains within the common-mode range.
Được đề xuất
Motor and Solenoid Protection
The LM339AM/NOPB can compare motor current, voltage, or position-derived signals to establish protective limits. Its 1.3 µs response is suitable for general-purpose protection rather than precise commutation timing, while four channels allow several conditions to be monitored in one package. Open-collector fault outputs can drive shutdown logic or status LEDs with an external pull-up. Place the sensing network away from motor current paths, account for inductive transients, and ensure the comparator inputs remain within their rated voltage limits.
Được đề xuất
Security and Access-Control Sensing
The LM339AM/NOPB fits access-control and security systems that compare a magnetic switch, light sensor, or resistor-network signal with a threshold. Its 2 mV maximum offset across the quad supports low-level decision margins, and the open-collector output can pull up to the voltage used by a controller or indicator. The 0 °C to 70 °C operating range suits controlled indoor environments, although extended-temperature installations require a different grade. Maintain the sensing signals on a stable ground reference and isolate them from relay and cable transients.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM339AM/NOPB — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | LM339DR | LM339DT | LM339AM | LM2901 | LM2901B |
|---|---|---|---|---|---|---|
| Package | 14-pin SOIC (D) | 14-pin SOIC (D) | 14-pin SOIC (D) | 14-pin SOIC (D) | 14-pin SOIC (D) | 14-pin SOIC (D) |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Count | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
Bảo phân biệt quan trọng
- Lower response time in the LM339DR comparison option (vsLM339DR)
- Lower offset rating in the B-version family (vsLM2901B)
- Lower per-comparator supply current in the B-version family (vsLM2901B)
Ghi chú thiết kế
Do not treat an open-collector output as a actively driven logic output. Fit a pull-up resistor on every output that must reach a valid logic-high state, and select its voltage to remain within the connected logic device’s input range. The pull-up also sets the output rise time, so excessively high resistance can slow edge propagation and create noise susceptibility. Confirm that the maximum sink current during output-low conditions remains within the LM339AM/NOPB channel rating.
Keep comparator input traces short and route them away from switching-regulator power nodes, relay contacts, high-current motor traces, and inductive loops. A solid ground return is particularly important because the device compares small voltage differences. Place any input-divider or reference components close to the relevant pins, and avoid routing open-collector outputs beneath noisy analog input nets where coupling could create false threshold transitions.
The comparator’s supply rating is 2 V to 36 V, but the connected signals must also satisfy the common-mode input limits. Do not assume that a 36 V supply permits all inputs to swing to 36 V. Use resistor dividers or protected front ends when sensing higher voltages, and calculate divider power dissipation from the actual worst-case input. The open-collector pull-up supply should be selected independently while remaining compatible with the output ratings.
The LM339AM/NOPB is rated from 0 °C to 70 °C, so it is a commercial-temperature option. Confirm the enclosure’s minimum and maximum ambient temperature rather than using the nominal board temperature. If the product must operate below 0 °C, above 70 °C, or in an automotive environment, choose a comparator with the corresponding temperature and qualification ratings rather than assuming the LM339 family shares every grade.
Thông tin tuân thủ
The NOPB ordering suffix identifies the lead-free part, but the verified records do not explicitly state RoHS, REACH, halogen-free, conflict-minerals, or automotive qualification status.