SP232ACT-L/TR - 120kbps RS-232 Transceiver | MaxLinear
料号： SP232ACT-L/TR ✓ 量产中SP232ACT-L/TR 概述
An RS-232 transceiver is an interface IC that bridges TTL-compatible digital logic and balanced, single-ended RS-232 communications. The SP232A belongs to the RS-232 transceiver hierarchy: interface IC, communications transceiver, line driver and receiver, and power-management-assisted interface. Its integrated charge-pump circuit raises the +5 V supply to the positive and negative voltages required for RS-232 drivers, while the receiver section converts incoming RS-232 levels back into TTL-compatible signals.
Key features include two transmit channels, two receive channels, 120 kbps operation under load, 10 V/µs driver slew rate, and operation with small 0.1 µF ceramic charge-pump capacitors. The SP232A is designed to be pin-to-pin compatible with popular industry-standard RS-232 pinouts, simplifying replacement of compatible transceivers. Its 16-SOIC format also supports compact point-to-point and multi-port serial-interface designs.
Technically, the charge pump generates the bipolar voltage required by the drivers, and the transmitter circuitry converts TTL input levels into RS-232 output levels. The receiver threshold circuitry detects the negative-going RS-232 signal used to indicate logic one. Because this is a single-supply design, system designers should account for the remaining voltage-drop budget across the interface and cable rather than assuming a modern low-voltage RS-232 architecture.
Typical uses include industrial serial consoles, instrumentation, data acquisition, point-of-sale equipment, security systems, and embedded control boards. The device is especially useful where a legacy RS-232 port must coexist with +5 V TTL logic and where a 120 kbps data rate is sufficient. For new designs requiring higher speed, lower supply voltage, or automatic shutdown, the complete family specification should be compared before fixing the PCB footprint.
A key implementation consideration is capacitor selection and placement. The manufacturer specifies 0.1 µF ceramic charge-pump capacitors, so use the approved dielectric and voltage rating and place each capacitor close to its associated device pins. Keep the RS-232 connector and transceiver interface path away from sensitive clocks, ADC inputs, and switching-node traces to reduce noise coupling.
This page consolidates verified distributor facts, the manufacturer SP232A datasheet, cross-reference evidence, practical design guidance, and same-package replacement information that can be evaluated quickly during component selection and PCB bring-up.
直接替换替代料： SP232ACT-L/TR ——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： SP232ACT-L/TR （相同外形与封装尺寸） ——差异在于 Package, Product Type, Operating Temperature, Data Rate, Supply Voltage.
SP232ECT-L
✅ 直接替换联系询价
查看数据手册 →SP232EEN-L/TR
✅ 直接替换联系询价
查看数据手册 →MAX232DR
✅ 直接替换联系询价
查看数据手册 →MAX202IDR
✅ 直接替换联系询价
查看数据手册 →SP485ECN-L
✅ 直接替换联系询价
查看数据手册 →SP232ACT-L/TR 规格参数
| Device Type | RS-232 transceiver |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Interface Protocol | EIA/TIA-232 and V.28 |
| Maximum Data Rate | 120 kbps under load |
| Driver Slew Rate | 10 V/µs |
| 电源电压 | +5 V |
| Charge-Pump Output | +6.5 V and -6.5 V |
| Charge-Pump Capacitor | 0.1 µF ceramic |
| 工作温度 | 0 °C to 70 °C |
| 封装 | 16-SOIC |
| 安装类型 | Surface mount |
| Technology | BiCMOS |
| Pin Compatibility | Pin-to-pin compatible with popular industry-standard pinouts |
| Supply Configuration | Single supply |
| RoHS 状态 | Compliant |
| Interface Protection | ESD protection |
SP232ACT-L/TR 引脚配置
| 引脚 1 | R1OUT — Receive 1 output |
| 引脚 2 | R2OUT — Receive 2 output |
| 引脚 3 | R2IN — Receive 2 input |
| 引脚 4 | R1IN — Receive 1 input |
| 引脚 5 | V- — Negative charge-pump output |
| 引脚 6 | V+ — Positive charge-pump output |
| 引脚 7 | T1IN — Transmitter 1 TTL input |
| 引脚 8 | T2IN — Transmitter 2 TTL input |
| 引脚 9 | T2OUT — Transmitter 2 RS-232 output |
| 引脚 10 | T1OUT — Transmitter 1 RS-232 output |
| 引脚 11 | GND — Ground |
| 引脚 12 | VCC — Positive +5 V supply |
| 引脚 13 | GND — Ground |
| 引脚 14 | V+ — Positive charge-pump output |
| 引脚 15 | V- — Negative charge-pump output |
| 引脚 16 | NC — Not connected |
典型应用
SP232ACT-L/TR 适用于 6 应用s: Industrial Serial Console, Instrumentation Data Port, Point-of-Sale Terminal, Embedded RS-232 Gateway, Data Acquisition Equipment, Security and Access Control.
Industrial Serial Console
The SP232ACT-L/TR fits legacy industrial console links where a controller exposes TTL logic and the external equipment expects RS-232. Its two transmitters and two receivers support bidirectional communication over separate differential pairs, while the 120 kbps rate under load is ample for command and status traffic. The single +5 V rail simplifies interface design, although the regulated charge pump requires 0.1 µF ceramic capacitors. Designers should verify voltage levels, grounding, and the 0–70 °C commercial-temperature range against the enclosure’s worst-case conditions.
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Instrumentation Data Port
SP232ACT-L/TR is suitable for connecting a measurement or control instrument to a host computer over a legacy RS-232 port. The 120 kbps maximum data rate supports moderate command and telemetry streams, and the 10 V/µs slew rate provides fast edge transitions for the line drivers. Two drivers and two receivers permit more than one RS-232 channel on the same board. Because the device uses +5 V and a charge pump, layout must separate its switching supply energy from precision analog and measurement circuitry to avoid coupling noise into the instrument front end.
推荐
Point-of-Sale Terminal
The SP232ACT-L/TR can bridge a +5 V embedded controller to an RS-232 peripheral used in point-of-sale, access-control, or service equipment. Its two-driver, two-receiver arrangement allows full-duplex serial communication while retaining a familiar 16-SOIC footprint. The 120 kbps rate is well matched to transaction messages and low-bandwidth configuration traffic. In a compact terminal, place the charge-pump capacitors beside the IC and route the RS-232 traces away from display power converters; the 0–70 °C range must also be checked against the terminal’s internal temperature.
推荐
Embedded RS-232 Gateway
SP232ACT-L/TR provides a straightforward RS-232 endpoint for embedded gateways that must communicate with legacy equipment, service tools, or external controllers. The 120 kbps rate is suitable for command-oriented protocols rather than continuous high-bandwidth transfers. Its integrated charge pump removes the need for a separate negative supply rail, which is valuable in space-constrained systems. Firmware designers should add software flow control if the connected device cannot honor the electrical interface’s transmit and receive timing, and PCB designers should provide a defined signal-ground reference between the board and RS-232 equipment.
推荐
Data Acquisition Equipment
The SP232ACT-L/TR can carry sampled data and configuration commands between a data-acquisition unit and a host PC through an RS-232 connection. Its 120 kbps rate limits sustained throughput, but it remains practical for moderate sample rates, status packets, and periodic transfer bursts. The transmitter’s 10 V/µs slew rate supports rapid signal transitions, while the receiver channels convert remote logic signals into levels compatible with the acquisition controller. For designs with high-speed sampling, use a separate higher-rate interface because buffering or compression would otherwise be required to avoid overrunning the RS-232 link.
推荐
Security and Access Control
SP232ACT-L/TR is applicable to access-control panels, camera controllers, and alarm interfaces that retain an RS-232 service port for configuration or diagnostics. Two receive channels can accept status signals from peripheral equipment, while the two driver channels support commands and acknowledgements. The 120 kbps rate is sufficient for event messages and setup traffic but not sustained video transport. Since this device is a commercial-temperature interface IC, install it only where ambient conditions remain within 0–70 °C or use a suitably rated alternative; security products should also apply the manufacturer’s ESD-protection guidance at exposed connectors.
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推荐产品汇总
工程参考数据： SP232ACT-L/TR ——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 | SP232ECT-L | SP232EEN-L/TR | MAX232DR | MAX202IDR | SP485ECN-L |
|---|---|---|---|---|---|---|
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Brand | MaxLinear | MaxLinear | MaxLinear | Maxim Integrated | Maxim Integrated | MaxLinear |
| Interface Type | RS-232 | RS-232 | RS-232 | RS-232 | RS-232 | RS-485 |
关键差异点
- Verified 120 kbps operation under load （对比 MAX232DR)
- Small ceramic charge-pump capacitors （对比 SP232ECT-L)
- Regulated bipolar charge-pump output （对比 SP232EEN-L/TR)
- Two full-duplex RS-232 channels （对比 SP485ECN-L)
设计说明
Place the two 0.1 µF ceramic charge-pump capacitors as close as practical to the SP232A charge-pump pins, using short traces and a solid ground reference. Select a dielectric approved in the MaxLinear datasheet and verify effective capacitance under the actual DC-bias and temperature conditions. Keep the capacitor loop small because long traces add inductance and can make startup behavior or charge-pump operation less repeatable.
Route the RS-232 driver and receiver nets away from sensitive clocks, ADC inputs, references, and switching-power nodes. The device uses an on-board charge pump, so its supply-current transitions can couple into nearby circuitry even though the data output itself is not a high-speed digital edge source. Maintain a continuous ground plane, return driver currents locally, and use a defined signal-ground connection to the remote RS-232 equipment according to the system grounding strategy.
Do not treat an RS-232 transceiver as a TTL UART and assume the logic polarity or voltage levels are interchangeable. TTL inputs go to the transmitter pins, whereas RS-232 levels appear at the transmitter outputs and enter the receiver inputs. Also verify that the connected equipment uses inverted RS-232 logic, supports the 120 kbps limit, and does not require RS-485 differential signaling. The maximum 0–70 °C range must also be respected.
Terminate or protect externally accessible RS-232 lines according to the connector and ESD-protection strategy, and route the protected interface toward the board edge. Avoid long unprotected traces or stubs. Maintain isolation between the RS-232 ground and sensitive analog ground only when the product architecture requires it; otherwise provide a deliberate common-reference path rather than leaving the interface ground floating.
合规信息
RoHS compliance is supported by the retrieved part data. AEC-Q100 qualification is not stated and is treated as not qualified; the device is specified for 0–70 °C commercial operation.