MAX232NE4 - Dual 120kbps RS-232 Transceiver | Texas Instruments
部品番号: MAX232NE4 ✓ 生産中MAX232NE4 概要
An RS-232 transceiver is an interface IC that bridges the voltage-domain gap between TTL/CMOS logic and the bipolar, single-ended signal system defined by EIA-232. Within the broader electronics hierarchy, the MAX232NE4 is a line transceiver, which is a communication interface IC used to connect a digital controller or embedded system to a serial port. Two driver channels convert TTL/CMOS inputs into RS-232 levels, while two receiver channels convert RS-232 inputs into logic-compatible signals.
Key electrical attributes include a 4.5 V to 5.5 V supply range, two drivers, two receivers, full RS-232 operation, a maximum signaling rate of 120 kbit/s, and ±30 V input-level capability. The integrated charge pump eliminates the need for a negative supply rail. The recommended implementation uses 1.0 uF charge-pump capacitors, which must be installed close to the device to limit loop area and preserve switching performance.
The MAX232NE4 is appropriate for legacy RS-232 ports, industrial equipment, service interfaces, and embedded-control systems where a 5 V logic domain must communicate with a PC or peripheral over an RS-232 link. Unlike a modern USB-to-serial converter, it remains a wired, point-to-point interface and requires a host-side UART or another system that already provides serial framing.
Designers should confirm the PCB footprint, charge-pump capacitor type, driver slew behavior, and receiver logic thresholds before substitution. The ±30 V input rating improves robustness against exposed or noisy cabling, but it does not remove the need for correct grounding, twisted-pair routing where applicable, and protection against sustained overvoltage events.
This page consolidates verified manufacturer and distributor information, identifies only package-compatible cross-reference candidates, and adds application guidance and design cautions that are not summarized on a typical distributor listing.
ドロップイン代替品: MAX232NE4 — 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。
MAX232EPE+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX232EEPE
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX232NE4 仕様
| Device Type | Dual EIA-232 driver/receiver transceiver |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| データレート | 120 kbit/s |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Supply Configuration | Single 5 V supply |
| Charge-Pump Capacitor Value | 1.0 uF |
| Input Voltage Level | ±30 V maximum |
| Driver Supply Current | 8 mA typical |
| ESD Protection | 8 mA typical; ±2 kV human-body-model ESD for the MAX232 family |
| Driver Output Level | ±9 V typical |
| Protocol | RS-232 / EIA-232 |
| Duplex Mode | Full duplex |
| パッケージ | 16-pin PDIP |
| Package Dimensions | 0.300 in (7.62 mm) DIP width |
| 実装タイプ | Through-hole |
MAX232NE4 0.300 in (7.62 mm) dip width ピン配置ガイド
MAX232NE4 (0.300 in (7.62 mm) dip width パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: MAX232NE4.
詳細は データシート をご参照ください。
主な用途
MAX232NE4 の用途: 6 件s: Legacy PC Serial Port Interface, Industrial Control Equipment, Embedded System Service Interface, Instrumentation and Test Equipment, Point-to-Point Data Terminal Equipment, RS-232 to TTL Serial Bridge.
Legacy PC Serial Port Interface
The MAX232NE4 fits legacy PC and industrial equipment that requires a wired RS-232 port rather than USB. Two driver/receiver pairs support two full-duplex channels, and the 120 kbit/s rate covers the UART baud rates commonly associated with this interface. Install the device between the 5 V logic system and the DB9 or cable driver, fit the specified 1.0 uF charge-pump capacitors, and verify that the host uses the same voltage-level convention. The integrated charge pump generates ±9 V typical outputs from one supply, avoiding a negative rail.
おすすめ
Industrial Control Equipment
The MAX232NE4 is useful in controller boards that must expose an RS-232 configuration or service port for tuning, diagnostics, or connection to a supervisory computer. Its single 5 V operation integrates with TTL or CMOS logic, while the ±30 V input capability adds tolerance to exposed cabling and noisy industrial environments. Place both transceiver channels according to the data-sheet layout and provide a common signal ground between the two ends of the cable.
おすすめ
Embedded System Service Interface
The MAX232NE4 can provide a dedicated service channel for firmware boot, configuration, and field diagnostics in an embedded controller. Two independent driver/receiver pairs allow one channel for logging and another for active control, and the 120 kbit/s limit supports common UART rates. Because the transceiver implements only the physical voltage layer, the host microcontroller must still configure its UART, command framing, and flow-control behavior.
おすすめ
Instrumentation and Test Equipment
The MAX232NE4 can bridge laboratory and test-instrument electronics to a legacy computer or controller through a wired RS-232 link. The two-channel arrangement supports separate command and measurement paths, while the 120 kbit/s rate is suitable for moderate-rate status and configuration traffic. Keep input and output routes away from fast-switching nodes to avoid reducing receiver margin, and use the specified charge-pump capacitors for stable driver amplitude.
おすすめ
Point-to-Point Data Terminal Equipment
The MAX232NE4 is appropriate for point-to-point equipment connections using full-duplex RS-232, including remote terminals and configuration equipment. It converts 5 V logic into ±9 V typical line levels and converts received line levels back into digital signals. Cable length and baud rate must be selected together, and the link should include a signal-ground reference because RS-232 is a single-ended interface rather than a differential standard.
おすすめ
RS-232 to TTL Serial Bridge
The MAX232NE4 can serve as the electrical interface in a compact RS-232-to-TTL bridge module for a microcontroller or embedded processor. One channel can carry a primary UART stream while the second supports hardware flow control or a second serial service, subject to the system firmware and wiring. The 16-pin PDIP package is appropriate for through-hole industrial boards, and the single 5 V supply simplifies integration with 5 V logic.
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: MAX232NE4 — 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 | MAX232EPE+ | MAX232EEPE |
|---|---|---|---|
| Package | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP |
| Brand | Texas Instruments | Analog Devices | Analog Devices |
| Device Type | Dual RS-232 driver/receiver | Dual RS-232 driver/receiver | Dual RS-232 driver/receiver |
主な差別化要因
- Integrated single-supply charge-pump architecture （vs MAX232EPE+)
- Two independent full-duplex RS-232 channels （vs MAX232EPE+)
- Robust input-level tolerance （vs MAX232EEPE)
設計ノート
Use one 1.0 uF charge-pump capacitor for each charge-pump section exactly as specified by the manufacturer data sheet. Place these capacitors adjacent to their corresponding pins to minimize loop area and switching transients. A 5 V rail with acceptable transient response is required; do not treat the MAX232NE4 as a regulator for the attached UART or system load.
Route the charge-pump components, supply pins, and ground connections as short as possible, while keeping RS-232 driver outputs away from receiver inputs and sensitive analog nodes. RS-232 is a single-ended standard, so maintain a common signal-ground reference between communicating systems. Follow the manufacturer layout and pin table rather than deriving capacitor connections from a generic MAX232 drawing.
The MAX232NE4 does not implement the UART protocol or electrical isolation. Confirm logic levels, baud rate, flow control, and grounding at the system level. Also verify whether a proposed substitute uses the same charge-pump pinout; a 16-pin PDIP package match alone does not guarantee electrical or pin-level interchangeability.
コンプライアンス情報
The supplied verified records identify the manufacturer, package, electrical function, and distributor listings but do not explicitly state RoHS, REACH, halogen-free, or conflict-minerals status. AEC-Q100 is treated as not applicable because this industrial interface IC is not identified as an automotive-qualified variant.