LM339ADRE4 - Quad Differential Comparator | Texas Instruments
MPN: LM339ADRE4 ✓ Hoạt độngLM339ADRE4 Tóm tắt
A comparator is an analog interface integrated circuit that determines whether one input voltage is above or below another voltage. The LM339ADRE4 belongs to the comparator hierarchy within analog and mixed-signal semiconductors. Unlike an operational amplifier intended mainly for closed-loop amplification, it is optimized for fast, saturated logic-level decisions. Four independent comparators in one package reduce component count and simplify designs requiring several sensing thresholds.
The LM339 family provides a low input offset voltage of 0.37 mV, an input bias current of 3.5 nA, and supply current of 200 µA per comparator. Its response time is listed as 300 ns, making it suitable for many industrial, instrumentation, and control applications. The open-collector outputs can sink current and require an external pull-up resistor, allowing the output voltage to be set by the logic supply connected to the pull-up network.
The maximum voltage rating reaches 38 V, while the normal operating supply range extends from 2 V to 36 V. Differential input voltage can approach the maximum-rated supply voltage, and the common-mode input range includes ground. This makes the device useful in single-supply sensing circuits where one signal remains near 0 V, as well as in dual-supply comparator arrangements using positive and negative rails.
Typical uses include overvoltage and undervoltage detection, industrial sensor interfaces, battery monitoring, temperature threshold circuits, zero-cross detection, and control-loop limit sensing. Four channels allow a compact implementation of window monitoring or multiple independent threshold decisions. The open-collector architecture also supports wired logic when a shared pull-up is used under suitable system conditions.
Designers should place input and output components close to the device, account for the open-collector pull-up network, and verify input common-mode and differential voltage limits. Because the outputs are open collector, they cannot source current independently. The pull-up resistor and its connected logic rail determine the high output voltage and rise time, making those values central to the overall switching design.
Bộ thay thế dễ dàng lắp đặt cho LM339ADRE4 — 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 LM339ADRE4 (cùng hình factor và footprint) — khác nhau ở Operating Temperature Range, Output Type, Package.
LM339BDR
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LM339BDRE4
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LM2903DR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LM2903DE4
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LM2903D
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LM339ADRE4 Tỷ lệ tối đa & tính chất điện
| Comparator Count | 4 channels |
| Supply Voltage Range | 2 V to 36 V |
| Maximum Voltage Rating | 38 V |
| Comparator Response Time | 300 ns |
| Input Offset Voltage | 0.37 mV |
| Input Bias Current | 3.5 nA |
| Điện áp cung cấp | 200 µA per comparator |
| Kiểu đầu ra | Open collector |
| Output Compatibility | TTL, MOS, and CMOS logic |
| Common-Mode Input Voltage | Includes 0 V ground reference |
| Differential Input Voltage | Up to ±38 V |
| ESD Rating | 2 kV HBM |
| Khoảng nhiệt độ hoạt động | 0 °C to 70 °C |
| Hộp | 14 leads, SOIC |
| Kiểu lắp đặt | Surface mount |
| Semiconductor Technology | Bipolar |
Cấu hình chân LM339ADRE4
| Chân 1 | OUT 1 — Comparator 1 open-collector output |
| Chân 2 | IN 1- — Comparator 1 inverting input |
| Chân 3 | IN 1+ — Comparator 1 non-inverting input |
| Chân 4 | GND — Ground connection |
| Chân 5 | IN 2+ — Comparator 2 non-inverting input |
| Chân 6 | IN 2- — Comparator 2 inverting input |
| Chân 7 | OUT 2 — Comparator 2 open-collector output |
| Chân 8 | OUT 3 — Comparator 3 open-collector output |
| Chân 9 | IN 3- — Comparator 3 inverting input |
| Chân 10 | IN 3+ — Comparator 3 non-inverting input |
| Chân 11 | GND — Ground connection |
| Chân 12 | IN 4+ — Comparator 4 non-inverting input |
| Chân 13 | IN 4- — Comparator 4 inverting input |
| Chân 14 | OUT 4 — Comparator 4 open-collector output |
Ứng dụng tiêu biểu
LM339ADRE4 phù hợp cho 6 Áp dụngs: Battery Pack Threshold Monitoring, Industrial Sensor Signal Conditioning, Power-Supply Overvoltage Detection, Temperature Control Limit Detection, Window Comparator Monitoring, Control-System Feedback Comparator.
Battery Pack Threshold Monitoring
The LM339ADRE4 fits multi-cell battery monitoring because it combines four differential comparator channels with a 2 V to 36 V supply range and 200 µA supply current per comparator. Two channels can establish charge and discharge thresholds while the remaining channels monitor auxiliary pack voltages. Each open-collector output can drive a pull-up to a low-power logic rail, producing a fault indication without requiring a powered output driver. The 0.37 mV input offset helps preserve accuracy near the decision threshold. For battery-connected equipment, add input protection for load dump and transient events, and verify that every monitored node remains within the datasheet common-mode and differential-input limits.
Được đề xuất
Industrial Sensor Signal Conditioning
The LM339ADRE4 is appropriate for conditioning slow industrial sensor outputs where a reliable threshold decision is more important than analog amplification. Its 3.5 nA input bias current minimizes loading on high-impedance sensors, while 0.37 mV input offset supports decisions between closely spaced voltage levels. A differential input can compare a conditioned sensor signal with a reference node, and the open-collector output can feed a controller input through a pull-up resistor. The 300 ns listed response time handles switching requirements beyond basic relay-style threshold detection. Confirm the 0 °C to 70 °C operating range against the enclosure temperature and apply input filtering when sensor nodes can experience electrical noise.
Được đề xuất
Power-Supply Overvoltage Detection
The LM339ADRE4 can monitor a power rail against a reference voltage and provide an open-collector fault output for a supervisor, relay, or system controller. Its supply range of 2 V to 36 V covers many low- and high-voltage monitoring applications, and the 38 V maximum rating provides headroom above the normal operating supply. The low 0.37 mV input offset is useful when the overvoltage threshold is close to the reference. Because the output only sinks current, use a pull-up resistor and keep the pull-up rail within the output transistor and logic-device ratings. Add input attenuation or clamping when the monitored rail can exceed the comparator's absolute maximum.
Được đề xuất
Temperature Control Limit Detection
In a thermal-control circuit, the LM339ADRE4 can compare a temperature-sensor amplifier output with upper and lower limit voltages. Four channels permit separate high-temperature, low-temperature, fan-enable, and alarm decisions without requiring four separate packages. The 0.37 mV input offset helps resolve small voltage changes from the sensor circuit, and the 300 ns response time is sufficient for rapid electrical limiting. The open-collector outputs can pull up to a relay-driver or logic input, although they cannot directly drive a current-limited relay coil without suitable driver circuitry. Account for the comparator's 0 °C to 70 °C ambient range and verify sensor accuracy separately from the comparator's input error.
Được đề xuất
Window Comparator Monitoring
The four channels in the LM339ADRE4 can implement a compact window-monitoring system in which separate comparators detect lower-limit and upper-limit violations. Two channels establish the upper and lower decisions, while the other channels can monitor a second rail or provide enable and alarm functions. The device operates from 2 V to 36 V and includes ground in its common-mode input range, making it suitable for single-supply systems with signals referenced to 0 V. Each open-collector output requires a pull-up, and system designers should confirm that the compared voltages remain within the differential-input rating. The low 0.37 mV offset helps make the window limits repeatable when the reference network is stable.
Được đề xuất
Control-System Feedback Comparator
The LM339ADRE4 can serve as a fast direction or limit detector in a closed-loop control system. A feedback voltage can be compared against a command voltage, and the resulting open-collector state can enable a driver stage or inhibit a switching path. Its 300 ns listed response time helps minimize decision delay, while the 200 µA-per-comparator supply current reduces overhead in distributed control electronics. The open-collector output is useful for wired-AND fault signals when pull-up resistors are provided. Designers must ensure stable reference sources, protect inputs from switching-node transients, and account for propagation delay when setting loop timing or hysteresis around the switching threshold.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM339ADRE4 — 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 | LM339BDR | LM339BDRE4 | LM2903DR | LM2903DE4 | LM2903D |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Package | 14-lead SOIC | 14-lead SOIC | 14-lead SOIC | 14-lead SOIC | 14-lead SOIC | 14-lead SOIC |
| Comparator Count | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels | 4 channels |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
Bảo phân biệt quan trọng
- Four independent threshold channels in one package (vsLM2904P3)
- Single-supply compatibility with ground-referenced signals (vsLM339BDR)
- Lower input offset for close threshold decisions (vsLM2903DR)
- Separate open-collector outputs for wired fault logic (vsLM339BDRE4)
Ghi chú thiết kế
Do not treat the open-collector output as a push-pull logic output. Each output needs a pull-up resistor and a defined logic rail; otherwise the output cannot reach a valid high state. Choose the resistor from the required sink current, output rise time, and power dissipation rather than from the comparator's response-time specification alone. Confirm that the pull-up voltage remains compatible with both the output transistor and the connected logic device.
Route comparator input and output nets away from switching nodes and keep the input traces short. Place the input compensation or filtering network close to the associated pins so that switching transients are not collected by the input traces. For sensitive threshold measurements, connect the input reference source through low-impedance routing and use a local return path to ground. Review the final board for differential-input transients because the permitted differential voltage is much larger than the normal common-mode operating range.
Decouple the LM339ADRE4 supply close to pins 4 and 11 with a short ground return. Keep the pull-up network on a suitably quiet rail when comparator outputs trigger sensitive control logic, and account for every transition current added by the pull-up resistors. The four channels can create simultaneous switching events, so evaluate the aggregate supply transient and bypass-capacitor requirement rather than sizing the decoupling for only one output state.
Verify both the common-mode and differential input limits at startup, shutdown, and during fault conditions. The 38 V maximum rating is not a continuous operating range for every input pin. A sensor or switching node can exceed that limit even when the comparator supply remains acceptable. Add series resistance, clamps, or divider networks where necessary, and ensure the 0 °C to 70 °C operating range of LM339ADRE4 matches the intended enclosure conditions.
Thông tin tuân thủ
No specific compliance declarations for the exact LM339ADRE4 ordering code were identified. Confirm material and environmental compliance for the required shipment configuration before production release.
