LM339D - 4-Comparator Open-Collector IC | Texas Instruments
MPN: LM339D ✓ Hoạt độngLM339D Tóm tắt
A voltage comparator is an analog comparator that evaluates two input voltages and changes its output state according to their relationship. The LM339 belongs to the comparator, analog IC, and signal-conditioning hierarchy. Unlike an op-amp configured for linear amplification, a comparator is intended for open-loop decision making. Its open-collector output requires an external pull-up resistor and can be wired with multiple comparator outputs when the electrical conditions permit.
The four independent channels allow one package to perform several threshold decisions. Open-collector outputs can interface with TTL, MOS, and CMOS-compatible circuits according to the family documentation, while the wide supply capability supports industrial and automotive-style environments. The low input bias current is useful when the comparator senses high-impedance sources, although input offset, common-mode range, output saturation, and supply limits must still be checked in the complete design.
The LM339 family is supported by TI’s application guidance for TL331, LM339, and LM393 devices, which emphasizes correct use of open-collector outputs, pull-up networks, input protection, and supply bypassing. The package and pin arrangement should be verified against the selected manufacturer’s datasheet before layout release, especially when replacing a part sourced from another manufacturer.
Typical applications include sensor threshold detection, battery or power-system monitoring, window comparator circuits, logic-level translation, relay or solenoid drive interfaces, and industrial control inputs. An external pull-up resistor is normally placed from each output to the downstream logic supply so that the open-collector transistor can pull the line low and release it high.
The main design consideration is that an open-collector output is not a push-pull logic output. Choose the pull-up voltage and resistor for the receiving device, verify output sink current, and account for the positive logic level at the receiver input. Place bypass capacitors close to the supply pins and keep sensitive input traces away from output and switching-current paths.
This product page consolidates verified distributor identity, manufacturer family specifications, package information, sourcing links, and engineering-oriented usage guidance. Exact pricing, stock, alternative parameter tables, and manufacturer-specific pin details remain dependent on the cited source pages and are not inferred where the supplied evidence is incomplete.
Bộ thay thế dễ dàng lắp đặt cho LM339D — 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 LM339D (cùng hình factor và footprint) — khác nhau ở Package, Comparator Type, Response Time, Logic Compatibility, Output Type.
LM339BD
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM339N
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LM339DR
✅ Drop-In ⚠️ Thông số chưa được xác minhLiên hệ để biết giá
Xem tài liệu →LM339DT
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
LM339D
Liên hệ để biết giá
Xem tài liệu →LM339D Tỷ lệ tối đa & tính chất điện
| Comparator Count | 4 |
| Product Type | General-purpose differential voltage comparator |
| Kiểu đầu ra | Open-collector |
| Supply Operation | Single or split supply |
| Maximum Rated Supply Voltage | Up to 38 V |
| Input Offset Voltage | 0.37 mV |
| Input Bias Current | 3.5 nA |
| Điện áp cung cấp | 200 µA per comparator |
| Response Time | 1 µsec |
| ESD Rating HBM | 2 kV |
| Hộp | 14-pin SOIC |
| Logic Compatibility | TTL, MOS, and CMOS-compatible output |
Hướng dẫn cấu hình chân LM339D 14-pin soic
Cấu hình chân cho LM339D (14-pin soic gói). Thành phần số hiệu này có chân đầu vào, đầu ra và nguồn cung cấp. Tham khảo tài liệu thông số kỹ thuật của nhà sản xuất để biết cấu hình chân bù, bù trừ và chân kích hoạt. Hoàn hảo cho điều kiện tín hiệu và mạch khuếch đại.
Không có dữ liệu chân cụ thể sẵn có cho LM339D.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
LM339D phù hợp cho 6 Áp dụngs: Sensor Threshold Detection, Power-System Monitoring, Window and Limit Comparison, Industrial Logic Interfacing, Relay and Solenoid Control, Memory and Level Control.
Sensor Threshold Detection
LM339D fits low-level sensing when a sensor output must be translated into a digital decision. Its verified family data lists 3.5 nA input bias current, which helps avoid loading high-impedance sensor nodes, and 0.37 mV input offset voltage, which supports threshold placement near the signal level. Each of the four channels can compare a sensor input against a reference, while the open-collector output can pull up to the logic system’s supply. Add input clamping and verify the common-mode range before connecting the sensor.
Được đề xuất
Power-System Monitoring
LM339D can supervise battery, supply, or system rails by comparing divided voltages against references and producing open-collector fault signals. The family’s single or split supply capability and maximum rated voltage of up to 38 V provide flexibility in industrial monitoring designs, while 200 µA supply current per comparator supports low-power systems. The designer must confirm the exact input voltage limits and use resistor-divider values that keep signals inside the permitted operating range.
Được đề xuất
Window and Limit Comparison
LM339D is suitable for window detection because the device contains four independent differential comparators rather than a single shared input stage. Two channels can establish upper and lower thresholds around a signal, and the remaining channels can provide additional limit checks or fault flags. The open-collector outputs can be pulled up to a common fault bus when their logic states are compatible. Verify input common-mode limits and propagation behavior when the thresholds must respond accurately.
Được đề xuất
Industrial Logic Interfacing
LM339D can interface low-voltage or analog control signals with TTL, MOS, and CMOS-compatible logic through its open-collector outputs. The output transistor provides a controlled low state, while an external pull-up resistor establishes the high level required by the receiver. This architecture is useful for wired-OR fault signals and level-driven industrial interfaces, but the pull-up voltage and resistor must be selected to satisfy sink-current, rise-time, and receiver-input-current requirements.
Được đề xuất
Relay and Solenoid Control
LM339D can generate a low-side control signal for a relay driver, solenoid driver, or discrete transistor stage after comparing a control voltage with a reference. The open-collector output is naturally suited to pulling up a transistor base or gate resistor network, provided the pull-up rail and transistor arrangement are designed for the required current. Add flyback protection for inductive loads and verify the comparator’s output saturation and absolute maximum limits under worst-case supply conditions.
Được đề xuất
Memory and Level Control
LM339D is identified by its manufacturer-family documentation for memory applications and general level detection. Four channels can monitor address, threshold, or control signals and produce open-collector enables or alarms. The device’s low input bias current is useful when the sensing source has high impedance, but system timing depends on the external pull-up resistance, wiring capacitance, and the family response time of approximately 1 µsec. Validate the complete timing budget in the target logic system.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM339D — 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 | LM339BD | LM339N | LM339DR | LM339DT | STMicroelectronics LM339D |
|---|---|---|---|---|---|---|
| Comparator Count | 4 | 4 | 4 | 4 | 4 | 4 |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector | Open-collector |
| Package | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-pin SOIC | 14-SO |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | STMicroelectronics |
Bảo phân biệt quan trọng
- Four independent comparator channels in one package (vsLM2904D)
- Open-collector output enables wired logic and level adaptation (vsLM339BD)
- Single or split supply support for flexible threshold circuits (vsSTMicroelectronics LM339D)
Ghi chú thiết kế
Do not treat the open-collector output as a push-pull logic output. Fit a pull-up resistor from each output to the voltage required by the receiving logic, and verify the resistor against output sink current, receiver input current, and required rise time. The LM339 family can interface with TTL, MOS, and CMOS-compatible circuits, but the correct pull-up voltage and load must be confirmed for the specific receiver.
Place supply bypass capacitors close to the comparator supply pins and return the capacitor ground through a short, low-impedance path. The verified family information identifies single or split supply operation, so the bypass arrangement should be checked against the selected wiring topology. If using split supplies, verify input common-mode and output voltage limits before enabling the circuit; the available evidence does not provide every operating-limit value.
Keep the four comparator input nets away from output pull-up loops and unrelated switching paths. Input bias current and offset voltage determine the error seen by high-impedance sensing nodes, while long traces add coupling and capacitance. Use short comparator traces, a local ground reference, and defined test points. Because exact pin names and package mapping were not included in the supplied evidence, verify the selected manufacturer pinout before PCB release.
Thông tin tuân thủ
The supplied verified data does not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for LM339D. Compliance should be confirmed using the selected manufacturer’s current documentation.