LM2903FVJ-E2 - Dual Ground-Sense Comparator | ROHM Semiconductor
MPN： LM2903FVJ-E2 ✗ 停產LM2903FVJ-E2 概覽
A comparator is an analog integrated circuit that compares two input voltages and produces a logic-level result indicating which input is higher. The dual architecture provides two comparison channels in one package, reducing component count when a board needs independent threshold decisions. The LM2903FVJ-E2 is intended for ground-sense applications, where a comparator evaluates a signal relative to a ground-referenced threshold and drives an open-collector output. Open-collector outputs allow wired-AND behavior when several outputs share a pull-up resistor, which is useful in alarm, interlock, and system-fault signaling circuits.
The key operating characteristics are the 3 V to 32 V supply range, two comparator channels, ground-sense input arrangement, and open-collector output architecture. The broad supply range allows the device to operate from conventional 5 V and 12 V industrial rails as well as higher-voltage systems, subject to the limits in the manufacturer datasheet. Its open-collector output stage requires an external pull-up resistor when a logic-high output is required. The output should not be assumed to drive a load directly; the pull-up resistor, downstream logic input, and fault-state behavior must be checked together.
Typical uses include overvoltage and undervoltage indication, ground-fault detection, battery or power-supply monitoring, industrial control interlock logic, threshold-based signal conditioning, and general embedded control. The comparator can operate directly from higher-voltage rails, but the input pins, output pull-up network, grounding, and protection network must remain within their specified limits. External filtering or clamping may be required when the monitored signal contains transients or exceeds the input common-mode range.
Designers should review the ROHM datasheet for the complete electrical limits, input common-mode range, output sink-current capability, response-time behavior, and package details before release to production. Because the manufacturer marks the LM2903FVJ as Not Recommended for New Designs, a responsible product decision should compare current ROHM alternatives rather than treating this part as the preferred choice for a fresh design. Existing production equipment may still benefit from a qualified replacement strategy when availability, lifecycle status, and electrical compatibility are reviewed.
This product summary consolidates the manufacturer product identity, package information, lifecycle status, operating-range information, practical application guidance, and sourcing questions into one engineering reference. It is intended to support initial part identification, circuit review, and replacement planning without replacing the complete manufacturer datasheet.
直接替換替代品，適用於 LM2903FVJ-E2 — 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。
此產品無可直接替換的替代品。
申請替代品LM2903FVJ-E2 最大額定值與電氣特性
| Product Type | Dual general-purpose ground-sense comparator |
| Comparator Channel Count | 2 channels |
| Operating Supply Voltage Range | 3 V to 32 V |
| Output Architecture | Open-collector output |
| Input Type | Ground-sense differential input |
| 封裝 | 8-pin TSSOP-B8J |
| 安裝類型 | Surface mount |
| Packing Type | Taping |
| 生命週期狀態 | Not Recommended for New Designs |
LM2903FVJ-E2 8-pin tssop-b8j 腳位配置指南
LM2903FVJ-E2（8-pin tssop-b8j 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： LM2903FVJ-E2.
請參閱 資料表 以查看完整腳位配置。
典型應用
LM2903FVJ-E2 適用於 6 應用s: Industrial Overvoltage Indication, Ground-Fault Detection, Power-Supply Monitoring, Battery Threshold Detection, Industrial Interlock Logic, Signal Conditioning and Threshold Logic.
Industrial Overvoltage Indication
The LM2903FVJ-E2 is well suited to threshold-based overvoltage indication because its two ground-sense comparator channels can monitor two conditions independently while operating from a 3 V to 32 V supply. One channel can evaluate a divided or shifted version of the monitored voltage against a reference, and its open-collector output can pull down a shared fault line. This arrangement reduces the number of discrete ICs in a multi-rail monitor while supporting wired-AND fault signaling. The design must verify the input common-mode range, source and sink currents, output polarity, and the pull-up voltage. Because ROHM marks the device Not Recommended for New Designs, it is most appropriate for maintenance of qualified industrial equipment; new platforms should evaluate a currently recommended dual comparator and confirm protection requirements.
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Ground-Fault Detection
The ROHM LM2903FVJ-E2 can support ground-fault detection by comparing a sensed ground-related voltage against a defined threshold and changing state when the fault level is exceeded. Its ground-sense architecture matches the use case directly, while the 3 V to 32 V operating range permits operation from common industrial supply rails. The open-collector output can be connected to a system alarm, relay-control circuit, or warning input through an external pull-up. Engineers should confirm the permitted input voltage, comparator offset, noise behavior, and propagation delay for the specific fault waveform. Input filtering and surge protection may be necessary where the monitored node experiences fast transients or large ground shifts.
推薦
Power-Supply Monitoring
A dual comparator can monitor positive and negative power conditions in one package, making the LM2903FVJ-E2 relevant to power-supply supervision and rail-status circuits. The two channels may be assigned to different threshold events, such as an overvoltage indication and an undervoltage indication, depending on the input network and output polarity. Because the outputs are open-collector, separate pull-up networks allow the channels to drive logic at an appropriate rail while also supporting a combined fault bus. The operating supply range of 3 V to 32 V supports operation in 5 V, 12 V, and 24 V systems. Final selection requires checking input common-mode limits, supply-current consumption, output sink capability, and startup behavior under a collapsing or rising rail.
推薦
Battery Threshold Detection
The LM2903FVJ-E2 can be used in battery-powered equipment to detect a charge, discharge, or rail threshold by comparing a scaled battery signal with a reference voltage. The two-channel arrangement allows one comparator to monitor a battery-derived rail while the other handles a secondary supply or charge-state threshold. Its 3 V to 32 V operating range accommodates many portable and industrial battery systems, although the actual comparator inputs must remain within their specified limits. An open-collector output can directly pull down a host-controller alert pin when combined with a suitable pull-up. Design attention should be paid to comparator offset, input noise, quiescent supply current, and the divider impedance, because these affect the usable threshold accuracy and battery life.
推薦
Industrial Interlock Logic
The LM2903FVJ-E2 is applicable to interlock and permissive logic where two sensed conditions must be evaluated before a machine or process is allowed to operate. Each open-collector output can represent one comparator condition and connect to a shared wired-AND line, allowing the system to inhibit operation when either condition is invalid. The 3 V to 32 V supply range is useful in 24 V industrial environments, while the dual-channel format conservates board area. A pull-up resistor and appropriate logic or driver stage should be selected for the fault bus. Safety-critical designs require validation of the comparator thresholds, response time, fail-safe state, output behavior during power loss, and separation between monitoring and safety-rated functions.
推薦
Signal Conditioning and Threshold Logic
The LM2903FVJ-E2 can convert an analog condition into a logic indication when a monitored signal must be compared with a threshold. In signal-conditioning circuits, the two channels may compare different nodes, such as a sensor output and a scaled reference. The open-collector stage provides flexible interface options because the pull-up can reference a local logic rail and multiple channels can share a fault line. For slow sensor signals, input offset and noise determine threshold stability; for fast events, propagation delay and output rise time determine response. The complete input common-mode range and differential input limits must be respected, and unused comparator channels should be terminated according to the ROHM datasheet. For new designs, check a currently recommended comparator with suitable input-stage characteristics.
推薦
推薦產品摘要
工程參考資料，適用於 LM2903FVJ-E2 — 比較、設計指引及合規資訊。
選型指南
主要差異化特點
- Direct ground-sense positioning (對比LM2903P)
- Two channels in a compact surface-mount package (對比LM2903P)
- Wide operating supply range (對比LM393ADR)
設計說明
Do not treat the open-collector output as a push-pull logic output. Provide a pull-up resistor to the appropriate logic rail and verify its value against the load current, output capacitance, and required switching speed. When outputs are tied together, the sink-current limit and off-state leakage of every connected device must remain within the datasheet limits.
Place the external pull-up resistor close to the comparator output and maintain a short return path to the device ground. Keep sensitive input traces away from the pull-up node and other switching-current paths. Before layout is released, use the ROHM package drawing to confirm the TSSOP-B8J land pattern, pin numbering, and exposed or unused-pin requirements.
Verify that every monitored input, the pull-up supply, and the output load remain inside the device's specified voltage and current limits. The 3 V to 32 V operating range does not imply that all pins tolerate 32 V. Use the manufacturer datasheet to distinguish supply-terminal limits from input and output-terminal limits, especially during transients and power-down sequences.
合規資訊
ROHM identifies the package as TSSOP-B8J and the packing type as taping. RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status are not stated in the available product summaries.
