LM2903S-13 - Dual 36V Differential Comparator | Diodes
部品番号: LM2903S-13 ✓ 生産中LM2903S-13 概要
A differential comparator is an analog integrated circuit that compares two input voltages and changes its output state according to their relationship. Within the broader hierarchy of comparator IC, voltage comparator, analog IC, and semiconductor, the LM2903S-13 is intended for general-purpose signal conditioning, threshold detection, and logic-interface applications. Its dual-channel architecture improves board utilization while keeping the two channels electrically independent.
Key features include a 36 V maximum total supply voltage, operation from a single supply or split supplies, and an input common-mode range that includes ground. The open-collector outputs are designed to interface with TTL, MOS, and CMOS logic. Each comparator can drive an external pull-up network, making the device useful when a wired-AND function or level translation is required. The stated 25 nA input bias current supports applications where input bias effects must be controlled.
The LM2903 family uses an open-collector output architecture rather than a push-pull or rail-to-rail CMOS output. When the output transistor is off, the output voltage is set by the pull-up resistor and its connected supply. When the output transistor is on, the output approaches ground while remaining within the device's output-current capability. This architecture provides flexibility in interface voltage, but it also requires an external pull-up resistor and suitable attention to pull-up current.
Typical applications include two-threshold monitoring, zero-cross detection, sensor-signal conditioning, relay or solenoid drive interfaces, window comparators, and general digital logic level translation. The device can also support dual-polarity sensing when powered from split supplies. Its 8-pin SOIC package is convenient for conventional through-hole assembly and hand rework, although modern high-density designs may prefer a smaller surface-mount package when one is qualified.
For reliable operation, keep the total supply voltage within the 36 V rating and observe the absolute maximum input and output limits listed in the manufacturer datasheet. Place the pull-up resistor close to the output net, maintain a continuous ground return, and account for the open-collector output's rise time, which is determined by output capacitance and pull-up resistance rather than by a dedicated push-pull driver.
This product page combines the LM2903S-13 device identity, package details, manufacturer-family information, sourcing references, pin-compatible alternatives, and application-oriented design guidance. It is structured to help engineers evaluate the comparator electrically before deciding whether the 8-pin SOIC implementation matches the assembly, protection, interface, and lifecycle requirements of the target design.
ドロップイン代替品: LM2903S-13 — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: LM2903S-13 （同一形状・フットプリント） — 相違点: Input Bias Current, Output Type, Package.
LM2903BIDR
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM2903BIDR
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM2903S
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LM2903BIDR
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM2903BIDR
✅ ドロップイン価格はお問い合わせください
データシートを見る →LM2903S-13 最大定格＆電気的特性
| Comparator Type | Dual differential comparator |
| Number of Channels | 2 channels |
| Maximum Total Supply Voltage | 36 V |
| Supply Voltage Range | ±18 V / 36 V total |
| Output Current | 20 mA |
| Input Bias Current | 25 nA |
| 出力タイプ | Open collector |
| Supply Configuration | Single supply or split supply |
| パッケージ | 8-pin SOIC (8-SO) |
| 実装タイプ | Surface mount |
| RoHS ステータス | RoHS |
LM2903S-13 8-pin soic (8-so) ピン配置ガイド
LM2903S-13 (8-pin soic (8-so) パッケージ) のピン配置。 このパワーデバイスは、ゲート、ドレイン、ソース端子を備えています。非極性パッケージの場合、正確なピン1の向きとフットプリントの詳細については、メーカーのデータシートを参照してください。主な用途には、電源設計、モータ駆動、負荷スイッチングがあります。
詳細なピン配置データはありません: LM2903S-13.
詳細は データシート をご参照ください。
主な用途
LM2903S-13 の用途: 6 件s: Dual-Threshold Monitoring, Sensor Signal Conditioning, Zero-Cross Detection, Relay and Solenoid Drive Interface, TTL and CMOS Level Translation, Battery-Powered Monitoring.
Dual-Threshold Monitoring
The LM2903S-13 is well suited to monitoring a signal against two independent limits because it contains two differential comparators in one 8-pin SOIC package. Each channel can compare a measured voltage with a separate reference and provide an open-collector status output. For a 3.3 V or 5 V digital system, pull each output up to the appropriate logic rail, allowing wired-AND behavior when multiple channels feed one controller input. The 36 V total supply capability also provides useful headroom for industrial input networks, although the common-mode input range and absolute maximum limits must be checked against the actual node voltage. Input filtering and hysteresis should be added where noise or slow input transitions could cause repeated output toggling.
おすすめ
Sensor Signal Conditioning
The LM2903S-13 can convert a slowly varying sensor signal into a digital indication by comparing the sensor node with a threshold reference. Its two independent channels permit useful arrangements such as upper and lower limits, directional detection, or a redundant comparison of related sensing elements. The 25 nA input bias-current rating is important when the source impedance is high, because bias current produces an offset across that impedance and can shift the apparent comparison point. The open-collector output makes it straightforward to use the comparator as an active-low alarm with a pull-up resistor. Designers should keep the reference divider close to the device, provide adequate bypass capacitance, and add controlled hysteresis to prevent chatter when the measured signal crosses the threshold slowly.
おすすめ
Zero-Cross Detection
Both channels of the LM2903S-13 can be used for zero-cross or polarity detection in low-frequency control and measurement circuits. A sinusoidal or bipolar input can be compared against ground or a small reference to generate a logic transition when the waveform changes sign. The comparator family supports single- and split-supply operation, allowing the same architecture to detect crossings in either positive-only or bipolar systems. Because the output is open collector, the transition polarity and pull-up arrangement determine whether the result is active high or active low. Add a controlled input offset or hysteresis to avoid multiple transitions around the zero point, and account for propagation delay when the detected event must be synchronized to another timing circuit.
おすすめ
Relay and Solenoid Drive Interface
The LM2903S-13 can provide the logic-side decision stage for a relay, solenoid, or lamp driver while the open-collector output works with an external transistor or suitable pull-up network. The comparator evaluates a control or feedback voltage, and its output state determines whether the downstream driver transistor is on. This arrangement keeps the sensitive decision node separate from the higher-current load. The stated 20 mA output-current capability must be treated as a device limit, while transistor base current, inductive transients, and thermal dissipation belong in the load-stage design. Include flyback protection for inductive loads and size pull-up resistors so that logic current remains within both the comparator and destination-device limits.
おすすめ
TTL and CMOS Level Translation
The LM2903S-13 can bridge incompatible logic domains by comparing a shifted or scaled input against a reference and pulling the destination-domain output up through a resistor. Its open-collector output is compatible with TTL, MOS, and CMOS interfaces according to the LM2903 family information, so the pull-up rail can be selected independently of the comparator supply when the electrical limits permit. This makes the device useful in legacy industrial, control, and embedded systems where a modern controller must interpret a legacy signal. The design must ensure that the input common-mode voltage remains valid, the pull-up voltage does not exceed the output limits, and the input and output timing requirements are met. Schmitt-style hysteresis or filtering may be required if the source transitions slowly.
おすすめ
Battery-Powered Monitoring
The LM2903S-13 can supervise battery-derived signals because its common-mode input range includes ground during single-supply operation. A pair of comparators can monitor pack voltage and a current-sense signal while operating from a shared supply, reducing the component count compared with two single-channel packages. Open-collector outputs can wake a controller or enable a downstream load through pull-up resistors. The exact battery chemistry and voltage range must be checked against the comparator's supply and input limits, particularly during transient events. Low quiescent demand is a family characteristic intended to support battery operation, but the actual device-specific supply current should be used in the complete power budget. Reverse-battery protection, surge filtering, and a stable low-noise reference remain external design requirements.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: LM2903S-13 — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | LM2903 | LM2903B | LM2903S | LM2903 | LM2903BIDR |
|---|---|---|---|---|---|---|
| Brand | Diodes Incorporated | Diodes Incorporated | Texas Instruments | onsemi | 3PEAK | Texas Instruments |
| Package | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC | 8-pin SOIC |
| Comparator Configuration | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator | Dual differential comparator |
| Output Type | Open collector | Open collector | Open collector | Open collector | Open collector | Open collector |
| Input Common-Mode Range | Includes ground | Includes ground | Includes ground | Includes ground | Includes ground | Includes ground |
| Special Characteristics | Standard LM2903 family | Standard LM2903 family | Lower offset, lower bias current, lower propagation delay, improved ESD performance | LM2903S dual-comparator family | LM2903 dual-comparator family | B-version performance with 8-pin SOIC ordering suffix |
主な差別化要因
- Established Diodes Incorporated dual-comparator sourcing （vs LM2903B)
- Ground-inclusive input operation （vs LM2903S)
- Open-collector interface flexibility （vs LM2903)
設計ノート
Do not treat an open-collector output as a push-pull output. Every LM2903S-13 output requires a pull-up resistor, and that resistor must connect to a voltage compatible with the downstream logic. Confirm that the pull-up current at the low output state stays within the device's 20 mA output-current capability. A pull-up that is too small can overload the output, while one that is too large increases output rise time and can allow slower logic nodes to see a non-valid transition.
Place each pull-up resistor close to its corresponding LM2903S-13 output and the receiving logic input. Keep the comparator, reference components, and decoupling capacitor in a compact area so that the sensitive input traces remain short. Use a continuous ground plane and connect the device ground pin directly to it. For long input traces, add a local input clamp or RC filter close to the comparator, while ensuring that added capacitance does not slow the intended response excessively.
Use intentional hysteresis when a noisy or slowly changing input can cross the reference multiple times. A positive-feedback resistor can create separated switching thresholds, but its value must be calculated together with the reference-source impedance. Also check the source impedance against the 25 nA input bias-current rating: bias current multiplied by source impedance creates an input-offset error. Stable references and short, guarded traces are generally more effective than increasing comparator gain, which the LM2903 does not provide.
コンプライアンス情報
The LM2903S-13 PDF listing identifies the part as RoHS compliant. No additional REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals declaration was established for this exact ordering suffix.
