MAX3243CDWR - 250kbps RS-232 Transceiver | Texas Instruments
料号： MAX3243CDWR ✓ 量产中MAX3243CDWR 概述
An RS-232 transceiver is an interface IC that combines a line driver, which converts TTL or CMOS logic signals into RS-232 voltage levels, with a receiver, which converts RS-232 signals back into logic levels. This integration reduces the number of external components required for serial-port interfaces and places both signal-conversion functions in one compact package.
The MAX3243CDWR supports a maximum signaling rate of 250kbps while operating across a 3V to 5.5V supply range. Its three drivers support multiple outbound serial channels, and its five receivers provide additional inbound channel capacity. The integrated ±15kV HBM ESD protection helps improve system resilience when a cable port is exposed to electrostatic discharge.
The device is designed for conventional RS-232 point-to-point links found in industrial control systems, data-acquisition equipment, service interfaces, and legacy peripheral connections. Because RS-232 uses unbalanced signaling, cable routing and grounding remain important even when the IC itself provides high levels of on-chip ESD protection.
The 28-pin SOIC package supports automated assembly and provides separate driver, receiver, ground, and supply connections. Applications can use the additional receiver channels for modem-control signals, hardware handshaking, status inputs, or other low-speed RS-232 signaling where the system requires more receive capability than the three driver channels.
When laying out a board, place the transceiver close to the connector and route each interface line directly to its assigned pin. Keep RS-232 traces away from clocks, switching-regulator nodes, and high-speed digital edges. The signal ground reference should be connected through the cable shield or according to the equipment grounding architecture, while chassis and signal grounds should remain separated where required by the interface specification.
This page combines the manufacturer specifications, explicit distributor pricing, verified drop-in references, and practical PCB guidance for engineers evaluating the MAX3243CDWR. It also distinguishes documented channel, voltage, speed, protection, and package details from information that requires separate engineering confirmation.
直接替换替代料： MAX3243CDWR ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
MAX3243CDWE4
✅ 直接替换📋 参考替代料（不在目录中）
MAX3243CWE4
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX3243CDWR 规格参数
| Product Type | Multichannel RS-232 line driver and receiver |
| Supply Voltage Range | 3V to 5.5V |
| Maximum Data Rate | 250kbps |
| Driver Channels | 3 channels |
| Receiver Channels | 5 channels |
| ESD Protection | ±15kV HBM |
| 封装 | 28-pin SOIC |
| 安装类型 | Surface mount |
| Logic Supply | 3V to 5.5V |
| Standards Compliance | RS-232 |
| RoHS 状态 | Compliant |
| Lead-Free Status | Yes |
MAX3243CDWR 28-pin soic 引脚配置指南
MAX3243CDWR（28-pin soic 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： MAX3243CDWR.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX3243CDWR 适用于 6 应用s: Industrial Controller Service Port, Data-Acquisition Equipment, Point-of-Sale Terminal, Embedded Equipment Configuration Port, Instrument Communication Interface, Security and Access-Control Equipment.
Industrial Controller Service Port
The MAX3243CDWR fits an industrial controller that retains a service or configuration port alongside its primary communications interfaces. Its three driver channels and five receiver channels provide enough connectivity for TX, RX, hardware handshaking, modem-control, and diagnostic-status signals without requiring several separate interface ICs. Operation from 3V to 5.5V accommodates both 3.3V and 5V control electronics, while the 250kbps rate matches conventional RS-232 equipment. The ±15kV HBM ESD protection adds robustness at a connector that technicians may reach with attached cables, although enclosure-level grounding and surge protection remain necessary.
推荐
Data-Acquisition Equipment
The MAX3243CDWR is appropriate for laboratory and industrial data-acquisition equipment that must communicate with legacy RS-232 instruments or controllers. The 250kbps maximum rate is sufficient for many command and measurement protocols, and five receiver channels allow additional handshake or status signals to share the same interface IC. Its 28-pin SOIC package is convenient for automated PCB assembly, while the 3V to 5.5V supply range supports mixed legacy and modern system rails. Keep the transceiver close to the DB9 or terminal connector, provide a stable signal-ground return, and account for cable-length-dependent signal degradation.
推荐
Point-of-Sale Terminal
The MAX3243CDWR can support a point-of-sale terminal or peripheral interface that needs several RS-232 control inputs in addition to a primary serial data path. The three drivers suit outbound channels, while five receivers can monitor printer-ready, cash-register, and status handshakes. Its 250kbps rate covers many peripheral protocols, and ±15kV HBM protection helps withstand electrostatic discharge encountered on frequently connected external cables. In a retail installation, place the IC near the connector, keep the RS-232 ground reference continuous, and separate chassis protection components from the logic ground where the installation architecture requires it.
推荐
Embedded Equipment Configuration Port
The MAX3243CDWR provides a practical configuration channel for embedded equipment where technicians connect a laptop or maintenance tool through RS-232. Its 28-pin SOIC footprint simplifies surface-mount assembly, and the asymmetric 3/5 channel arrangement supports command output plus multiple handshake and status inputs. The device accepts a 3V to 5.5V supply, making it suitable for systems with common embedded logic rails. Because the interface may be exposed during servicing, the integrated ±15kV HBM protection is valuable, but a correctly designed connector shield path and controlled ground reference are still needed for dependable field operation.
推荐
Instrument Communication Interface
The MAX3243CDWR can serve as the communications interface in test and measurement instruments that retain a general-purpose RS-232 port for remote commands and data transfer. A 250kbps link rate is appropriate for many short-distance instrument protocols, and the additional receiver channels can be assigned to hardware handshaking or remote-control signals. The 3V to 5.5V operating range supports both older 5V logic and newer 3.3V systems. Route the serial outputs directly from the transceiver to the connector, maintain a low-impedance signal-ground return, and avoid sharing sensitive analog ground paths with high-current switching nodes.
推荐
Security and Access-Control Equipment
The MAX3243CDWR fits access-control and security equipment that uses RS-232 for configuration, diagnostics, or peripheral handshakes. The three transmitter and five receiver channels support a serial data path plus several control inputs, while 250kbps is sufficient for typical configuration traffic. The integrated ±15kV HBM ESD protection is useful at an exposed equipment port, although it does not replace certified surge protection or a proper enclosure ground. The 28-pin SOIC package supports compact controller layouts, and the 3V to 5.5V range allows integration with common access-control logic platforms. Confirm the environmental qualification requirements for each installed product before production release.
推荐
推荐产品汇总
工程参考数据： MAX3243CDWR ——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 | MAX3243CDWE4 | MAX3243CWE4 |
|---|---|---|---|
| Package | SOIC-28 | SOIC-28 | SOIC-28 |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Type | RS-232 line driver and receiver | RS-232 line driver and receiver | RS-232 line driver and receiver |
| Supply Voltage Range | 3V to 5.5V | 3V to 5.5V | 3V to 5.5V |
| Maximum Data Rate | 250kbps | 250kbps | 250kbps |
| Driver Channels | 3 channels | 3 channels | 3 channels |
| Receiver Channels | 5 channels | 5 channels | 5 channels |
| ESD Protection | ±15kV HBM | ±15kV HBM | ±15kV HBM |
| Ordering Suffix | CDWR | CDWE4 | CWE4 |
| Commercial Terms | Request a Quote | Request a Quote | Request a Quote |
关键差异点
- More receive channels than driver channels （对比 SP3243EHCA-L/TR)
- Documented same-footprint ordering option （对比 MAX3243CDWE4)
- Integrated interface-channel balance （对比 MAX202CDWR)
- Low-voltage supply compatibility （对比 SP3243EHCA-L/TR)
设计说明
Place the MAX3243CDWR next to the RS-232 connector and route each driver and receiver line directly to the corresponding connector or protection component. Long parallel runs can increase susceptibility to crosstalk and induced noise. Keep interface traces away from high-current switching nodes and maintain a continuous signal-ground return between the transceiver and connector.
Treat ESD protection and cable transients as separate design layers. The MAX3243CDWR provides ±15kV HBM protection on the interface, but its working voltage range and HBM rating do not by themselves define system surge immunity. Select connector, series-resistance, TVS, and grounding components according to the required installation-level protection while observing the transceiver absolute-maximum limits.
Decouple the 3V to 5.5V supply close to the transceiver with the capacitance and placement specified in the manufacturer datasheet. Keep the loop between the device ground pins and the local supply-return capacitor short. This reduces supply impedance during driver transitions and helps prevent logic disturbance on boards where the RS-232 interface shares power with processors, memories, or communications circuitry.
Do not substitute an RS-232 transceiver solely because it has a similar channel count. Verify the 28-pin SOIC footprint, each pin assignment, supply range, driver and receiver electrical limits, shutdown behavior, and ESD rating. The MAX3243CDWE4 has a documented same-package replacement relationship, while other cross-brand devices require separate footprint and pinout verification before use.
合规信息
The distributor listing identifies the MAX3243CDWR as RoHS3 compliant and lead-free. No separate REACH, halogen-free, conflict-minerals, or automotive qualification claim is stated for this exact ordering option.