MAX3243EAI+ - 3/5 RS-232 Transceiver, 235kbps | Maxim
N.º da peça: MAX3243EAI+ ✓ AtivoMAX3243EAI+ Visão geral
An RS-232 transceiver is an interface IC that converts between logic-level UART signals and the voltage-domain signals used by RS-232 equipment. The MAX3243 belongs to the broader EIA/TIA-232 interface family, which sits between serial communication controllers and external D-sub connectors or other RS-232 links. Its three transmitters support multiple outbound channels, while five receivers provide additional inbound or monitoring channels.
The MAX3243EAI+ uses a dual charge-pump circuit to generate the voltage levels required by RS-232 transmitters. According to the Analog Devices MAX3243 data sheet, the MAX3243E family provides ±15 kV HBM and air-gap ESD protection and ±8 kV contact-discharge protection. Automatic shutdown reduces supply current to 1 µA when active communication is not required, while wake-up operation helps lower system power consumption.
The device supports operation from +3 V to +5.5 V, making it suitable for systems using either 3.3 V or 5 V digital logic. Its stated maximum data rate of 235 kbps exceeds the throughput commonly required by conventional asynchronous serial ports. The 28-pin SSOP package provides a compact surface-mount solution, although the relatively long lead span and limited pin count should be considered in high-density layouts.
Typical applications include multi-channel RS-232 links in industrial controllers, test equipment, point-of-sale terminals, data acquisition systems, instrumentation, and external serial-port expansion. The three drivers are useful where one controller must connect to multiple peripheral ports, while the five receivers can handle return channels or multiple incoming data sources.
PCB implementation should place charge-pump capacitors and the interface-side protection network close to the device, keep RS-232 traces away from sensitive logic, and provide suitable return paths for surge current. The unused driver outputs and receiver inputs must be terminated according to the manufacturer's data sheet rather than left floating.
This page consolidates verified manufacturer and distributor information, price context, pin-package details, practical interface-design guidance, and candid replacement analysis. It also distinguishes electrically similar MAX3243 variants that are not true same-package drop-ins, helping engineers avoid assumptions based only on the MAX3243 family name.
Alternativas drop-in para MAX3243EAI+ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
MAX3243EAI
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3243EAI-TG51
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3243EAI+ Especificações
| Product Type | RS-232 transceiver |
| Line Drivers | 3 |
| Line Receivers | 5 |
| Supply Voltage Range | +3 V to +5.5 V |
| Maximum Data Rate | 235 kbps |
| Shutdown Supply Current | 1 µA |
| Power Management Feature | AutoShutdown and automatic wake-up |
| Charge-Pump Architecture | Dual charge-pump circuit |
| ESD Protection, HBM | ±15 kV |
| ESD Protection, Air Gap | ±15 kV |
| ESD Protection, Contact | ±8 kV |
| Compliance Standard | TIA/EIA-232-F |
| Interface Standards | V.28 and V.24 |
| Encapsulamento | 28-pin SSOP |
| Tipo de montagem | Surface mount |
Guia de Configuração de Pinos do MAX3243EAI+ 28-pin ssop
Configuração de pinos para MAX3243EAI+ (pacote 28-pin ssop). A numeração dos pinos, funções e diagramas de conexão estão definidos no datasheet do fabricante. Consulte-o para o footprint exato e diretrizes de soldagem.
Nenhum dado detalhado de pinagem disponível para MAX3243EAI+.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
MAX3243EAI+ é adequado para 6 aplicaçãos: Industrial serial controller, Data acquisition equipment, Test and measurement instrumentation, Point-of-sale terminal, Embedded UART expansion, External serial-port converter.
Industrial serial controller
The MAX3243EAI+ fits industrial serial controllers that need several RS-232 channels on one logic board. Its three transmitters and five receivers provide more channel capacity than a single-driver interface, while operation from +3 V to +5.5 V allows use with both 3.3 V and 5 V digital systems. The 235 kbps maximum rate supports high-speed asynchronous links. According to the Analog Devices MAX3243 data sheet (Rev. 10), automatic shutdown reduces supply current to 1 µA when the interface is inactive. Designers should still verify the exact temperature grade, terminate unused receiver inputs as directed, and route the external RS-232 side away from sensitive control circuitry.
Recomendado
Data acquisition equipment
The MAX3243EAI+ is appropriate for data-acquisition equipment that exposes one or more RS-232 links to a host controller. The three transmitters can support outgoing channels to peripherals, and five receivers provide additional inputs for monitoring or command acknowledgments. Its 235 kbps capability is substantially above the throughput of many conventional serial-port peripherals, while +3 V to +5.5 V operation supports embedded processors operating at either common logic voltage. The connection-pin ESD ratings provide useful interface protection, but cable transients and industrial surges still require board-level design validation and an appropriate enclosure or surge-protection strategy.
Recomendado
Test and measurement instrumentation
The MAX3243EAI+ can connect laboratory and field-test instruments that use multiple RS-232 channels for commands, status, and synchronized data exchange. Three driver outputs suit several connected fixtures, while five receiver inputs support return data and monitoring lines. The device's 235 kbps maximum data rate accommodates instrument communication streams that exceed ordinary legacy-port throughput. Its 28-pin SSOP package helps keep the interface compact, although the long gull-wing leads require adequate copper and solder-joint area. Designers should follow the manufacturer's charge-pump capacitor placement and include external protection when test leads expose the board to severe ESD or surge conditions.
Recomendado
Point-of-sale terminal
The MAX3243EAI+ fits point-of-sale terminals that need a combination of outbound peripheral links and inbound status channels. Three transmitters can address peripherals such as printers, scanners, or customer displays, and five receivers can monitor responses over shared logic-side routing. Its automatic shutdown and wake-up behavior helps avoid leaving the transceiver powered continuously when the terminal is idle, with the documented 1 µA shutdown supply current providing a useful low-power figure. The +3 V to +5.5 V supply range supports both legacy 5 V and modern 3.3 V logic. Thermal and environmental suitability for the terminal enclosure must be checked against the unspecified ordering-grade temperature range.
Recomendado
Embedded UART expansion
The MAX3243EAI+ allows an embedded controller with a limited number of UART channels to expand RS-232 connectivity without adding three separate interface packages. Three driver outputs and five receiver inputs provide flexible channel allocation for external modules, while the 235 kbps data rate accommodates a broad range of embedded serial protocols. Because the device works from +3 V to +5.5 V, it can sit alongside both 3.3 V and 5 V processors, provided the logic thresholds match the selected system. Firmware must avoid simultaneously driving an RS-232 output from another source, and unused inputs should be handled according to the manufacturer recommendations rather than left unintentionally active.
Recomendado
External serial-port converter
The MAX3243EAI+ fits external serial-port converters designed to bridge modern USB or embedded controllers to legacy RS-232 equipment. The converter can expose multiple driver and receiver channels where a multi-port product requires more connectivity than a single transceiver provides. Its 235 kbps maximum rate supports data-intensive legacy links, and the +3 V to +5.5 V operating range simplifies adapter supply design. The MAX3243E family's ±15 kV HBM and air-gap ESD ratings strengthen the connection interface, while ±8 kV contact protection covers the specified contact-discharge condition. These ratings should be combined with connector placement, enclosure grounding, and production-process controls rather than treated as complete lightning protection.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX3243EAI+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
MAX3221EAE+ is not a pin-compatible replacement because it has fewer channels and a different package and pinout. Choose it only for a new design after comparing its verified channel count, data rate, supply voltage, and footprint. Likewise, MAX3243CPWR and MAX3243ECPWR are not literal drop-ins for the SSOP target because their verified package is 28-pin TSSOP. For new multi-channel interfaces, verify the operating-temperature grade, unused-pin treatment, charge-pump capacitor values, connector protection, and production availability before releasing the design.
Comparação com alternativas
| Parâmetro | Este produto | MAX3243EAI | MAX3243EAI-TG51 |
|---|---|---|---|
| Package | 28-pin SSOP | 28-pin SSOP | 28-pin SSOP |
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Line Drivers | 3 | 3 | 3 |
| Line Receivers | 5 | 5 | 5 |
| Supply Voltage Range | +3 V to +5.5 V | +3 V to +5.5 V | +3 V to +5.5 V |
| Maximum Data Rate | 235 kbps | 235 kbps | 235 kbps |
| ESD Protection, HBM and Air Gap | ±15 kV | ±15 kV | ±15 kV |
| ESD Protection, Contact | ±8 kV | ±8 kV | ±8 kV |
| Power Management | AutoShutdown and automatic wake-up | AutoShutdown and automatic wake-up | AutoShutdown and automatic wake-up |
Principais diferenciais
- Five receiver channels support more inbound RS-232 connections (vs MAX3221EAE+)
- Three transmitter channels expand outbound connectivity (vs MAX3221EAE+)
- Higher verified maximum data rate (vs MAX3221EAE+)
Notas de projeto
Place the charge-pump capacitors and local supply-decoupling capacitor close to their associated MAX3243EAI+ pins, following the values and layout shown in the Analog Devices MAX3243 data sheet (Rev. 10). Keep the external RS-232 traces short where practical, provide a continuous ground reference, and separate connector-side routing from sensitive logic. The dual charge-pump circuit is part of the interface function, so incorrect capacitor connection or placement can affect both voltage generation and EMC behavior.
Do not treat MAX3243CPWR or MAX3243ECPWR as literal drop-ins for MAX3243EAI+. Although both are 28-pin MAX3243-family devices, the verified comparison data identifies their package as 28-pin TSSOP, while MAX3243EAI+ is a 28-pin SSOP. A PCB footprint change may be required. Also confirm the temperature grade, lead-free status, and ordering suffix of MAX3243EAI or MAX3243EAI-TG51 before approving a substitution.
The MAX3243EAI+ contains a dual charge-pump circuit, so its switching activity can couple into surrounding circuitry if layout is poor. Reference the manufacturer's application guidance, keep supply and charge-pump return paths compact, and avoid routing sensitive signals beneath the transceiver. At the connector, use a low-inductance ground path and assess whether additional protection is needed for cables connected to an uncontrolled external environment.
Automatic shutdown can reduce the stated supply current to 1 µA when the interface is inactive, but its effect on the complete product depends on how the system detects activity and wakes the device. Validate the wake-up timing against the host UART and avoid excessive polling that eliminates the power benefit. Supply decoupling must follow the manufacturer data sheet because an incorrectly sized or remotely placed capacitor can reduce noise immunity or destabilize the charge-pump rails.
Informações de conformidade
The supplied verified results mention RoHS and REACH only as comparison fields; no explicit compliance declaration for MAX3243EAI+ was provided. Compliance must be confirmed from the current manufacturer product declaration or product-page compliance documentation. The target is a general industrial/communication interface IC, but automotive qualification cannot be assumed from the E suffix.