MAX232NG4 - 5V Dual RS-232 Transceiver | Texas Instruments
料号： MAX232NG4 ✗ 停产MAX232NG4 概述
An RS-232 transceiver is an interface IC that bridges the voltage-domain difference between computer serial ports and embedded logic. The MAX232 family combines line drivers, line receivers, and a capacitive charge-pump voltage generator. This hierarchy places it within interface ICs and semiconductor signal-conditioning components, while its EIA/TIA-232-F function makes it useful for legacy serial communication, industrial control, and equipment interfaces.
The principal operating characteristics include a 4.5 V to 5.5 V supply range, full-duplex operation, and a maximum signaling rate of 120 kbps. Each receiver converts an RS-232 input to a TTL/CMOS output, with a typical input threshold of 1.3 V, typical hysteresis of 500 mV, and the ability to accept inputs up to ±30 V. The integrated voltage generator avoids a separate ±12 V power supply when only one 5 V rail is available.
The MAX232NG4 uses a charge-pump architecture to develop positive and negative RS-232 levels. That architecture simplifies board-level power design but requires the external charge-pump capacitors specified by the manufacturer. The device is intended for through-hole PCB assembly in the 16-pin PDIP package. The MAX232NG4 orderable variant is listed as obsolete, so new production designs should confirm current family options and lifecycle status before committing a BOM.
Typical uses include legacy PC serial ports, programmable instrumentation, industrial control interfaces, service consoles, and embedded systems that exchange RS-232 commands with external equipment. The 120 kbps rate is appropriate for conventional serial links rather than high-speed differential networking. For a new board, the related MAX232 family in a surface-mount package may simplify assembly, but changing package construction requires PCB layout and thermal-soldering review.
The primary design consideration is preserving the charge-pump capacitor connection and ensuring that connector-side signals and ground routing follow the manufacturer layout guidance. Input and output logic levels must also be checked against the connected host voltage. Because the MAX232NG4 package is obsolete, engineers should treat any replacement search as a lifecycle decision as well as an electrical and pin-compatibility assessment.
This page consolidates the verified manufacturer and distributor information with lifecycle context, application guidance, practical design considerations, and a parameter-by-parameter comparison with documented same-package alternatives. It is intended to support engineering selection and sourcing decisions without obscuring the distinction between electrical equivalence and manufacturing-status changes.
直接替换替代料： MAX232NG4 ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MAX232NG4 （相同外形与封装尺寸） ——差异在于 Mounting Type, Product Type.
MAX232N
✅ 直接替换📋 参考替代料（不在目录中）
MAX232ACPE+
✅ 直接替换联系询价
查看数据手册 →MAX232ACPE+
✅ 直接替换联系询价
查看数据手册 →SP232ACP-L
✅ 直接替换📋 参考替代料（不在目录中）
HIN232ACP
✅ 直接替换📋 参考替代料（不在目录中）
MAX232NG4 规格参数
| Product Type | Dual RS-232 line driver and receiver |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Duplex Mode | Full duplex |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Nominal Supply Voltage | 5 V |
| Maximum Data Rate | 120 kbps |
| Receiver Input Threshold | 1.3 V typical |
| Receiver Hysteresis | 500 mV typical |
| Receiver Input Voltage Range | ±30 V |
| Driver Output Level | ±9 V |
| ESD Protection | ±2 kV |
| 工作温度范围 | 0 °C to 70 °C |
| 封装 | 16-pin PDIP |
| 安装类型 | Through hole |
| Voltage Generation | Capacitive charge-pump voltage generator |
| 生命周期状态 | Obsolete |
MAX232NG4 16-pin pdip 引脚配置指南
MAX232NG4（16-pin pdip 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： MAX232NG4.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX232NG4 适用于 6 应用s: Legacy PC Serial Port Interface, Industrial Control Equipment Console, Programmable Test and Measurement Instrument, RS-232 Configuration Port, Serial Service and Diagnostics Interface, Embedded RS-232 Communication Module.
Legacy PC Serial Port Interface
The MAX232NG4 fits a legacy PC or embedded host that requires bidirectional RS-232 communication from a 5 V logic rail. Its two transmitters and two receivers support two full-duplex serial channels without requiring separate positive and negative power rails. According to the manufacturer product information, the device operates up to 120 kbps and includes ±2 kV ESD protection. Place it between the host UART and DB9 or other RS-232 connector, while keeping the charge-pump capacitors and connector-side return path close to the IC. The main limitation is its 0 °C to 70 °C rating and obsolete ordering status.
推荐
Industrial Control Equipment Console
The MAX232NG4 can provide the RS-232 interface between a controller and a service console when equipment uses a single 5 V supply and nominal RS-232 signaling at or below 120 kbps. Its dual-channel architecture allows separate transmit and receive paths for a full-duplex link, while the integrated charge pump produces approximately ±9 V driver outputs. According to the verified datasheet information, receivers can accept signals up to ±30 V and provide 500 mV typical hysteresis. Ensure the selected console connector and cable leave adequate surge protection because the IC's documented ESD protection is ±2 kV.
推荐
Programmable Test and Measurement Instrument
The MAX232NG4 is appropriate for legacy test equipment that accepts remote commands over RS-232 and returns measurements through the same interface. Two transmitters and two receivers support a full-duplex command path, while the 120 kbps rate is sufficient for conventional parameter exchanges and status messages. According to the Texas Instruments product page, the interface provides ±9 V output levels and ±2 kV ESD protection. In an instrument, locate the transceiver near the connector or provide a short protected interface path, maintain a common ground, and verify whether the 0 °C to 70 °C range satisfies the enclosure's measured temperature conditions.
推荐
RS-232 Configuration Port
The MAX232NG4 can serve as a dedicated configuration interface for industrial equipment, test fixtures, and embedded accessories that need a reliable 5 V-to-RS-232 bridge. The two-driver/two-receiver arrangement permits simultaneous control and status traffic, and the 120 kbps signaling rate covers many legacy configuration protocols. According to the verified specifications, the receiver threshold is 1.3 V typical and hysteresis is 500 mV typical, helping distinguish valid logic states on the receiver side. Validate the host UART voltage, connector gender, cable length, and ground reference, and add external surge protection when the port connects to an exposed field cable.
推荐
Serial Service and Diagnostics Interface
The MAX232NG4 is useful in equipment that exposes diagnostics through an RS-232 service connector while operating from a single 5 V supply. The full-duplex arrangement lets the device send status, logs, and test responses while receiving configuration commands at rates up to 120 kbps. According to the manufacturer description, the integrated charge-pump voltage generator avoids a separate bipolar RS-232 supply, and the documented ESD rating is ±2 kV. Place the receiver and driver paths to minimize exposed area, follow the required capacitor connections, and consider external isolation or protection for long cables or electrically noisy environments.
推荐
Embedded RS-232 Communication Module
The MAX232NG4 can serve as the cable-side interface in a compact embedded communication module built around 5 V logic. It converts two logic-level channels into RS-232 signals and converts two incoming RS-232 signals back to TTL/CMOS levels, allowing bidirectional equipment communication. According to the verified distributor data, it supports 4.5 V to 5.5 V operation, full duplex, and 120 kbps signaling. The 16-pin PDIP construction favors repairable or through-hole legacy modules, but new compact products should evaluate a supported surface-mount family member after checking pin compatibility. Preserve adequate ground continuity and apply connector-level protection where cables leave the enclosure.
推荐
推荐产品汇总
工程参考数据： MAX232NG4 ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MAX232N | MAX232ACPE | MAX232ACP | SP232ACP-L | HIN232ACP |
|---|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Sipex | Intersil |
| Package | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP | 16-pin PDIP |
| Function | Dual RS-232 driver/receiver | Dual RS-232 driver/receiver | Dual RS-232 driver/receiver | Dual RS-232 driver/receiver | Dual RS-232 driver/receiver | Dual RS-232 driver/receiver |
| Number of Drivers | 2 | 2 | 2 | 2 | 2 | 2 |
| Number of Receivers | 2 | 2 | 2 | 2 | 2 | 2 |
关键差异点
- Exact ordering identity for legacy DIP-16 designs （对比 MAX232N)
- Documented commercial-temperature implementation （对比 SP232ACP-L)
- Complete 5 V charge-pump RS-232 function （对比 HIN232ACP)
设计说明
Use the manufacturer's specified charge-pump capacitor values and connect them to the designated pins without substituting capacitors based only on voltage rating. The MAX232NG4 generates its bipolar RS-232 levels from a single 4.5 V to 5.5 V supply, but correct operation still depends on the external capacitive voltage generator network. Keep the capacitor connections short and place the device's ground and supply-return path close to the IC to limit switching-current loops and unstable charge-pump behavior.
Separate connector-side RS-232 signals from sensitive logic and clock routes, and provide a direct return path between the interface ground and the host ground. The documented receiver input capability reaches ±30 V and the driver output is approximately ±9 V, but those values do not replace connector-level ESD and surge protection. Keep exposed traces short, use a solid ground plane, and evaluate external protection for cables that leave the enclosure or pass near high-energy switching circuits.
Do not treat a matching package name as proof of drop-in equivalence. For every MAX232NG4 replacement, compare the complete pin names, supply pins, charge-pump capacitor pins, receiver thresholds, driver output levels, operating-temperature range, and ESD rating against the Texas Instruments datasheet. The original exact MPN is listed as obsolete, so a candidate can differ electrically or commercially even when the 16-pin PDIP footprint appears unchanged. Record lifecycle status and qualification evidence in the approved-vendor list.
合规信息
The supplied search results do not provide authoritative RoHS, REACH, lead-free, halogen-free, or conflict-minerals declarations for the exact MAX232NG4 variant. AEC-Q100 is not applicable to this commercial-temperature RS-232 interface IC because no automotive qualification is documented.