LM2903P - Dual Differential Comparator, 30 V, PDIP-8 | Texas Instruments
MPN: LM2903P ✓ Hoạt độngLM2903P Tóm tắt
A comparator is an analog integrated circuit that compares two input voltages and produces a digital logic result. The LM2903 family belongs to the broader comparator and analog signal-conditioning hierarchy, where open-collector outputs provide flexible interface options for pull-up resistors, relay drivers, lamp circuits, and low-voltage digital logic. Its differential inputs allow one signal to be monitored against a reference or another input, making the device suitable for window detection, current sensing, sensor thresholding, and industrial control circuits.
The LM2903P uses two independent comparators, with output transistors capable of sinking current into an external pull-up network. The verified data identifies the output style as open-collector and rail-to-rail, while the family description confirms two independent voltage comparators and operation from a single power supply over a wide voltage range. The LM2903P is supplied through a tube package in the verified distributor result, making it appropriate for through-hole production and prototype boards rather than compact surface-mount assemblies.
Typical uses include monitoring a control voltage, detecting an overvoltage or undervoltage condition, converting an analog sensor threshold into a logic event, and driving an alert or shutdown input. Because an open-collector output requires an external pull-up resistor, the output voltage is defined by the pull-up supply and resistor rather than by the comparator alone. Designers should also verify input common-mode limits, output sink current, supply-current requirements, and propagation delay for the exact operating conditions.
The principal design consideration is that the LM2903P is a through-hole PDIP-8 comparator, not a low-power modern micropower comparator. Its application circuit must respect the device's supply voltage, input voltage, common-mode range, output pull-up arrangement, and maximum output current. This page combines the verified manufacturer and distributor information with practical application guidance and same-family replacement context for engineers evaluating an LM2903P design.
Bộ thay thế dễ dàng lắp đặt cho LM2903P — 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 LM2903P (cùng hình factor và footprint) — khác nhau ở Package, Comparator Type, Mounting Type, ESD Rating, Input Bias Current.
LM2903BIDR
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →LM2903V
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM2903AV
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
LM2903P Tỷ lệ tối đa & tính chất điện
| Comparator Type | Dual differential comparator |
| Number of Comparators | 2 |
| Kiểu đầu ra | Open-collector |
| Output Style | Rail-to-rail |
| Supply Voltage Range | 2 V minimum |
| Maximum Supply Voltage | Up to 38 V for LM2903B family |
| Input Offset Voltage | 0.37 mV for LM2903B family |
| Input Bias Current | 3.5 nA for LM2903B family |
| Điện áp cung cấp | 200 uA per comparator for LM2903B family |
| Response Time | 1 us for LM2903B family |
| ESD Rating | 2 kV HBM for LM2903B family |
| Hộp | 8-pin PDIP |
| Kiểu lắp đặt | Through-hole |
Hướng dẫn cấu hình chân LM2903P 8-pin pdip
Cấu hình chân cho LM2903P (8-pin pdip 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 LM2903P.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
LM2903P phù hợp cho 6 Áp dụngs: Industrial Overvoltage Detection, Battery Threshold Monitoring, Sensor Signal Conditioning, Relay and Lamp Control, Window Detection, Power Supply Fault Signaling.
Industrial Overvoltage Detection
The LM2903P fits industrial overvoltage detection because it provides two independent differential channels and open-collector outputs that can pull down an alarm or shutdown line. Place one input on the monitored signal and the other on a threshold reference, then use a pull-up resistor to establish the inactive logic level. The verified family data identifies operation from a single supply over a wide voltage range and describes the LM2903 as a dual differential comparator, making the device appropriate for monitoring separate rails or two related thresholds. Because the LM2903P is a PDIP-8 through-hole part, it is particularly convenient for industrial control boards that use plated-through holes and leaded assembly. Verify the exact input common-mode limits and maximum supply conditions in the manufacturer datasheet before setting the operating voltage.
Được đề xuất
Battery Threshold Monitoring
The LM2903P can monitor battery or pack voltages by comparing the scaled pack voltage against a reference threshold and changing its open-collector state when the limit is crossed. The two independent comparators allow separate upper and lower monitoring functions, such as overcharge and undervoltage detection, without requiring two separate IC packages. The open-collector output is useful with a pull-up because the logic-high voltage can remain tied to the system logic rail even when the monitored battery voltage is lower. The LM2903P's dual differential architecture is confirmed by the manufacturer product page, while the exact input bias and offset for the selected LM2903P grade must be checked before setting a narrow threshold. Keep the comparator inputs within the common-mode range and provide local bypassing on the supply pins.
Được đề xuất
Sensor Signal Conditioning
The LM2903P is suitable for converting a sensor-derived analog voltage into a clean threshold event for a controller or alarm. The differential inputs reduce the need for a single-ended reference arrangement when comparing a conditioned sensor signal with a locally generated threshold, while the open-collector output can directly pull down a wired logic input or status line. The verified distributor data confirms the general-purpose open-collector, rail-to-rail output configuration. In a practical circuit, scale the sensor output, establish the threshold with a stable reference, and add a pull-up resistor with a value selected for the intended sink current and rise time. The older comparator architecture is appropriate for many industrial designs, but engineers should verify input offset, input bias current, and response time for the exact operating point from the official datasheet.
Được đề xuất
Relay and Lamp Control
The LM2903P's open-collector output can sink current for a relay driver, indicator lamp, or other switched load when the load and pull-up arrangement are designed for the device's output ratings. One comparator can control the load while the second provides an independent interlock or fault condition, which is useful in simple industrial panels and monitoring boards. The rail-to-rail output description in the verified distributor listing supports use near the supply range, but the external transistor or driver may still be required when coil current exceeds the comparator's permitted output current. Choose pull-up and load components with suitable voltage and current ratings, and verify the maximum output conditions in the official data sheet. The PDIP-8 package is easy to prototype and service, although it consumes more board area than a surface-mount comparator.
Được đề xuất
Window Detection
The LM2903P can implement a window detector by using its two independent differential comparators to establish lower and upper thresholds around a permitted input range. Each output changes state when its corresponding limit is crossed, allowing a controller to distinguish an in-range signal from an undervoltage or overvoltage fault. The verified manufacturer description identifies the part as two independent voltage comparators, and the cross-reference data confirms that LM2903P is an 8-pin PDIP device with the standard LM2903 family pinout and behavior. Practical designs should account for input offset and reference accuracy, since they determine the actual transition points. Add hysteresis with positive feedback where chatter near a threshold would be unacceptable, and confirm that the external pull-up voltage and resistor meet the downstream logic requirements.
Được đề xuất
Power Supply Fault Signaling
The LM2903P is well suited to power-supply fault signaling because its two channels can monitor two rails and pull fault lines low when either monitored voltage leaves its allowed range. The open-collector output provides a practical way to combine multiple fault conditions through a wired pull-up arrangement, while the through-hole PDIP-8 package is convenient for legacy and industrial control boards. According to the verified manufacturer information, the LM2903 family is designed for single-supply operation over a wide voltage range and is available in the LM2903P PDIP configuration. The design must include scaling resistors or dividers for the monitored voltages, account for input common-mode restrictions, and avoid exceeding the comparator's supply and output ratings. For new compact products, compare the LM2903P against a smaller surface-mount alternative before releasing the PCB.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho LM2903P — 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 | LM2903 | LM2903V | LM2903AV |
|---|---|---|---|---|
| Package | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP | 8-pin PDIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments |
| Comparator Configuration | Dual differential | Dual differential | Dual differential | Dual differential |
| Output Type | Open-collector | Open-collector | Open-collector | Open-collector |
| Mounting Type | Through-hole | Through-hole | Through-hole | Through-hole |
| Special Feature | General-purpose dual comparator | General-purpose dual comparator | General-purpose dual comparator | General-purpose dual comparator |
Bảo phân biệt quan trọng
- Documented PDIP-8 drop-in family options (vsLM2903V)
- Two independent differential channels in one package (vsLM2903)
- Open-collector output flexibility (vsLM2903AV)
Ghi chú thiết kế
The open-collector output requires an external pull-up resistor. Choose the pull-up supply to match the downstream logic level, and size the resistor to balance output rise time against sink current. Keep the comparator supply decoupling close to the device. The verified family data identifies single-supply operation over a wide range, but the exact LM2903P operating and absolute-maximum limits must be confirmed in the official data sheet.
Do not assume that an open-collector output can source current. The output transistor pulls the node low, while the external pull-up provides the logic-high state. Also keep both differential inputs within the allowed common-mode range at all times. Because the verified results do not provide the complete LM2903P pinout or electrical limits, use the manufacturer datasheet for final input-voltage, output-current, and thermal checks.
The LM2903P is an 8-pin PDIP through-hole device, so its footprint requires adequate hole spacing and lead-clearance on the PCB. Route comparator inputs away from switching nodes and high-current switching paths, and place the pull-up resistor close to the output pin to limit parasitic inductance. The verified cross-reference source identifies the same 9.81 mm by 6.35 mm footprint and through-hole lead spacing for the documented alternatives.
Although a comparator dissipates relatively little power compared with a power regulator, the exact maximum supply voltage and output conditions still require thermal-margin review. Use the package and copper area recommended by the manufacturer for the operating ambient temperature. Do not infer the LM2903P's exact temperature rating or package thermal resistance from the LM2903B family summary; those values are listed as data-needed in the specifications.
Thông tin tuân thủ
The supplied verified search results do not explicitly state the LM2903P RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. These fields remain unknown rather than being inferred.