MAX3243CUI+ - 3-5.5V 250kbps RS-232 Transceiver | Analog Devices
N.º da peça: MAX3243CUI+ ✓ AtivoMAX3243CUI+ Visão geral
An RS-232 transceiver is a serial-interface semiconductor that converts logic-level signals into RS-232 line levels and converts received line levels back into digital logic. The MAX3243 belongs to the interface IC hierarchy, where it combines drivers and receivers in one package. AutoShutdown is particularly useful for battery-powered equipment because it removes the need for a separate software-controlled power path when the serial link is idle or disconnected.
The principal operating features include a 3.0 V to 5.5 V supply range, operation up to 250 kbps, integrated charge-pump circuitry, and ±15 kV ESD protection on the serial interface. The device supports both 3 V and 5 V systems, allowing the same transceiver architecture to serve industrial controls, embedded equipment, and legacy RS-232 ports. Its three drivers and five receivers provide flexible channel allocation for peripheral buses, service consoles, and point-to-point links.
Technically, the MAX3243 family uses an efficient on-board power supply to generate the positive and negative voltages required by RS-232 transmitters from a single supply. The verified manufacturer page identifies the MAX3243 as production, with a product datasheet at Revision 10. The MAX3243CUI+ ordering code uses the compact TSSOP-28 package, making it suitable for space-constrained industrial-control and communications boards.
Typical applications include industrial serial adapters, embedded instrumentation, POS terminals, diagnostic consoles, and communications equipment requiring both transmit and receive paths. It is especially useful where automatic power reduction is valuable, such as battery-operated test instruments or systems whose RS-232 port is only active during maintenance. The 250 kbps maximum data rate supports moderate-speed command and control traffic.
When laying out the circuit, preserve the recommended charge-pump capacitor connections and place bypass capacitance close to the supply pins. Keep RS-232 traces away from sensitive analog signals, provide the required protection network if exposed to user cables, and verify the receiver polarity and logic thresholds of the connected equipment. The supplied data does not include a complete pin table, so pin assignments should be confirmed against the manufacturer datasheet before layout release.
This page combines the verified manufacturer specifications, distributor pricing, package information, supported drop-in candidates, comparison parameters, and practical RS-232 design guidance. It is intended to help engineers identify the correct replacement and plan power, layout, and signal-integrity requirements without relying on distributor summaries alone.
Alternativas drop-in para MAX3243CUI+ — mesmo encapsulamento, compatível pino a pino. Peças de encapsulamento diferente que exigem retrabalho na PCB são excluídas.
Variantes desta série
Modelos da mesma série compatíveis como drop-in com MAX3243CUI+ (mesmo formato e footprint) — diferindo em ESD Protection, Number of Drivers, Number of Receivers, Supply Voltage Range.
MAX3243ECUI+
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3243CUI
✅ Drop-In📋 Alternativa de referência (fora do catálogo)
MAX3243CPW
✅ Drop-InConsulte o preço
Ver ficha técnica →MAX3243CUI+ Especificações
| Supply Voltage Range | 3.0 V to 5.5 V |
| Maximum Data Rate | 250 kbps |
| ESD Protection | ±15 kV |
| Number of Drivers | 3 drivers |
| Number of Receivers | 5 receivers |
| AutoShutdown Supply Current | 1 µA |
| Encapsulamento | 28-pin TSSOP |
| Transceiver Configuration | 3/5 full-duplex configuration |
| Interface Standard | RS-232 |
| Supply Type | Single positive supply |
| Power Architecture | Dual charge-pump power supply |
| Status do ciclo de vida | Production |
| Manufacturer List Price | $3.43 at 1,000 units as of 2026-10-30 |
| Tipo de montagem | Surface mount |
| RoHS Compliance | unknown (status not supplied) |
| REACH Compliance | unknown (status not supplied) |
| AEC-Q100 Qualification | unknown (status not supplied) |
Guia de Configuração de Pinos do MAX3243CUI+ 28-pin tssop
Configuração de pinos para MAX3243CUI+ (pacote 28-pin tssop). 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 MAX3243CUI+.
Consulte a ficha técnica para a configuração completa dos pinos.
Aplicações típicas
MAX3243CUI+ é adequado para 6 aplicaçãos: Industrial RS-232 Control Port, Battery-Powered Portable Adapter, POS Terminal and Service Console, Embedded Instrumentation Interface, Network Equipment Maintenance Port, Medical and Diagnostic Equipment Interface.
Industrial RS-232 Control Port
The MAX3243CUI+ fits an industrial controller that must support several RS-232 peripherals through one compact interface. Its three drivers and five receivers provide flexible channel allocation, while the 250 kbps maximum rate is suitable for command, status, and configuration traffic rather than high-speed bulk transfer. The 3.0 V to 5.5 V operating range allows use with both modern 3.3 V and legacy 5 V control electronics. The 28-pin TSSOP also reduces board area compared with a larger package. Before release, verify connector-side protection, grounding, and the exact pin assignments against the manufacturer datasheet.
Recomendado
Battery-Powered Portable Adapter
The MAX3243CUI+ is appropriate for a battery-powered adapter because AutoShutdown is documented to reduce supply current to approximately 1 µA when no valid receiver signal is present. This can conserve energy when a connected equipment port is idle or temporarily disconnected. The device accepts a 3.0 V to 5.5 V supply, allowing optimization for either a 3.3 V or 5 V platform, and its 250 kbps capability is more than adequate for maintenance, diagnostic, or configuration commands. Validate wake-up behavior, input thresholds, and cable-length performance in the intended system rather than assuming every system requires continuous operation.
Recomendado
POS Terminal and Service Console
The MAX3243CUI+ supports a point-of-sale terminal or service console that exchanges low-speed RS-232 commands with printers, scanners, or diagnostic equipment. Three transmitters permit connection to multiple peripheral directions, while five receivers can consolidate status or control inputs. Its ±15 kV ESD protection is a useful interface-layer feature where cables connect to external equipment, although system-level protection still depends on connector placement and board layout. The 28-pin TSSOP suits compact terminal electronics, and the 250 kbps rate aligns with conventional RS-232 command traffic. Validate the selected driver and receiver assignments against the attached equipment protocol.
Recomendado
Embedded Instrumentation Interface
The MAX3243CUI+ can serve as the communications interface in embedded instrumentation that requires several legacy RS-232 ports. Three driver channels can initiate requests or control commands, while five receiver channels can monitor instrument responses and status signals. A 250 kbps maximum rate provides ample margin for textual measurement data, configuration commands, and diagnostic protocols. The single 3.0 V to 5.5 V supply requirement simplifies system design, although the internal charge pump requires correct capacitor placement. In laboratories or production fixtures, account for ground offsets and cable transients because the interface rating alone does not replace complete system protection.
Recomendado
Network Equipment Maintenance Port
The MAX3243CUI+ is useful in network and communications equipment that retains an RS-232 maintenance or out-of-band management port. The interface can support a console connection while conserving standby power through AutoShutdown, which is useful when the management connector is not continuously active. Its 250 kbps rate is suitable for terminal sessions, configuration loading, and low-volume diagnostics, while ±15 kV ESD protection adds robustness at an exposed connector boundary. The compact TSSOP package preserves PCB area for switching, storage, or networking circuitry. Keep the port layout compatible with the enclosure and grounding strategy, and verify that the host UART operates at a supported logic level.
Recomendado
Medical and Diagnostic Equipment Interface
The MAX3243CUI+ can support legacy service communication in medical or diagnostic equipment where a compact, low-power RS-232 interface is required. The 3.0 V to 5.5 V supply range accommodates embedded processors operating at either 3.3 V or 5 V, and AutoShutdown limits consumption when the service port is inactive. The 250 kbps rate is appropriate for supervisory commands, configuration data, and diagnostic reporting. Because the supplied data does not establish medical-system certification for this exact ordering code, compliance must be assessed at the finished-product level. Signal integrity, isolation, patient-protection boundaries, and connector protection must be independently designed rather than inferred from the transceiver rating.
Recomendado
Resumo dos produtos recomendados
Dados de referência de engenharia para MAX3243CUI+ — comparação, orientação de projeto e informações de conformidade.
Guia de seleção
Comparação com alternativas
| Parâmetro | Este produto | MAX3243ECUI+ | MAX3243CUI | MAX3243CPW |
|---|---|---|---|---|
| Package | 28-pin TSSOP | 28-pin TSSOP | 28-pin TSSOP | 28-pin TSSOP |
| Brand | Analog Devices | Analog Devices | Analog Devices | Texas Instruments |
| Supply Voltage | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Maximum Data Rate | 250 kbps | 250 kbps | 250 kbps | 250 kbps |
| ESD Protection | ±15 kV | ±15 kV | ±15 kV | ±15 kV |
| Driver and Receiver Count | 3 drivers and 5 receivers | 3 drivers and 5 receivers | 3 drivers and 5 receivers | 3 drivers and 5 receivers |
| AutoShutdown Supply Current | Approximately 1 µA | Approximately 1 µA | Approximately 1 µA | Approximately 1 µA |
Principais diferenciais
- Three transmitters and five receivers in one interface package (vs MAX3243ECUI+)
- 250 kbps operation with ±15 kV ESD protection (vs MAX3243CPW)
- Approximately 1 µA AutoShutdown supply current (vs MAX3243CUI)
Notas de projeto
Place the charge-pump capacitors and supply bypass capacitor exactly where the MAX3243 manufacturer datasheet recommends. The internal dual charge pump generates the bipolar voltage required by the RS-232 drivers, so long capacitor traces or an incorrect ground return can reduce driver margin. Keep the charge-pump loop compact, provide a low-impedance ground connection, and avoid routing those switching-current paths beneath sensitive analog circuitry.
Route driver outputs toward the connector and receiver inputs away from switching nodes with direct return paths. Although the documented ±15 kV ESD rating provides useful robustness, it does not replace connector-level protection or a defined chassis and signal-ground strategy. For long or externally accessible RS-232 cables, evaluate surge paths, common-mode transients, and the grounding scheme in the complete product rather than relying on the IC rating alone.
The 3.0 V to 5.5 V supply range supports both 3.3 V and 5 V systems, but the bypass network should be selected for the exact rail and expected transient environment. AutoShutdown can reduce idle demand to approximately 1 µA when no valid receiver signal is detected, yet a floating or noisy receiver input may affect shutdown behavior. Test the connected equipment state, startup sequence, and wake-up timing before relying on the low-power mode.
Do not substitute a same-family-looking part solely because its frequency or data-rate headline matches. Confirm the complete 28-pin TSSOP footprint, pin names, enable behavior, shutdown thresholds, temperature grade, and lifecycle status against the official datasheet. MAX3243EWI+, for example, is identified in a 28-pin WSOIC package and is therefore not a strict drop-in replacement despite belonging to the same product family.
Informações de conformidade
The supplied manufacturer and distributor excerpts do not explicitly state the compliance status for MAX3243CUI+. A comparison result mentions RoHS and REACH for MAX3243CUI+T, but it does not provide verified values for the exact MAX3243CUI+ ordering code, so no compliance conclusion has been assumed.