SP3222ECT-L/TR - 3V-5.5V RS-232 2-Driver/2-Receiver Transceiver | MaxLinear
料号： SP3222ECT-L/TR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $1.85 | $1.85 |
| 10 | $1.62 | $16.20 |
| 100 | $1.34 | $134.00 |
| 500 | $1.1 | $550.00 |
| 1,000 | $0.96 | $960.00 |
| 2,500 | $0.84 | $2,100.00 |
SP3222ECT-L/TR 概述
An RS-232 transceiver is a type of serial communication interface IC that converts logic-level UART signals (typically 0V/3.3V or 0V/5V CMOS/TTL) to the higher bipolar ±5V to ±15V signaling levels required by the legacy EIA/TIA-232 standard. Within the broader hierarchy, RS-232 transceivers belong to the line driver/receiver family, which itself sits under interface ICs in the power management and connectivity ecosystem. They are essential for bridging modern microcontrollers with industrial PCs, point-of-sale terminals, legacy peripherals, and serial debug ports.
Key features include true EIA/TIA-232-F compliance from a 3.0V to 5.5V rail, an enhanced ESD protection rating on the RS-232 pins, 1 µA shutdown current with receiver wake-up, and integrated charge-pump DC-DC converters that eliminate the need for a separate ±12V supply. The 18-SOIC wide-body package supports standard 300-mil PCB footprints and provides robust thermal performance for industrial environments. Operating temperature range is 0°C to +70°C for the commercial-grade 'ECT' suffix variant.
The architecture pairs an on-chip charge pump with a proprietary low-dropout transmitter topology and a logic-side receiver with hysteresis, ensuring noise-immune reception in electrically noisy industrial cabinets. The high-efficiency charge pump uses only four small 0.1 µF capacitors and produces ±5.5V rails from a 3.3V input, allowing true RS-232 swing without external DC-DC converters.
Typical applications include notebook and palmtop computers, industrial control PLC serial ports, point-of-sale (POS) terminals, battery-powered handheld instruments, and any design that needs true RS-232 levels from a single low-voltage logic supply.
When designing with this part, keep in mind that the shutdown pin (/SHDN) must be driven high for normal operation and pulled low only when battery life is critical. Decoupling the charge-pump capacitors with short, low-ESR traces directly at pins C1+, C1-, C2+, and V- minimizes output ripple.
This page synthesizes distributor pricing, drop-in alternative MPNs, and practical design notes not found in the standalone manufacturer datasheet, giving purchasing and engineering teams a single source for cross-functional decision-making.
直接替换替代料： SP3222ECT-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。
快速对比工具——选择替代料号进行并排对比：
SP3222ECT-L
✅ 直接替换📋 参考替代料（不在目录中）
SP3232ECY-L
✅ 直接替换📋 参考替代料（不在目录中）
SP3232EET-L
✅ 直接替换📋 参考替代料（不在目录中）
SP3222EUEY-L
✅ 直接替换📋 参考替代料（不在目录中）
MAX3222ECWN+T
✅ 直接替换📋 参考替代料（不在目录中）
ICL3222EIAZ
✅ 直接替换📋 参考替代料（不在目录中）
TRS3222ECDR
✅ 直接替换📋 参考替代料（不在目录中）
SP3222ECT-L/TR 规格参数
| 功能 | Transceiver |
| Protocol | RS-232 |
| Number of Drivers/Receivers | 2/2 |
| Duplex | Full |
| 数据速率 | 120 kbps (minimum, full load) |
| Supply Voltage (VCC) | 3.0 V to 5.5 V |
| 关断电流 | 1 µA (receivers active) |
| 工作温度 | 0 °C to +70 °C |
| 封装 / 外壳 | 18-SOIC (0.295 in / 7.50 mm width, 300 mil) |
| 安装类型 | Surface Mount |
| Packaging | Tape & Reel (TR) |
| Charge Pump Capacitors | 0.1 µF (4 capacitors, 3.3V operation) |
| Standards Compliance | EIA/TIA-232-F |
| Lead Free / RoHS | RoHS Compliant (per distributor listings) |
SP3222ECT-L/TR 引脚配置
| 引脚 1 | C1+ — Charge pump capacitor 1 positive terminal |
| 引脚 2 | V+ — Charge pump generated positive supply (+5.5V) |
| 引脚 3 | C1- — Charge pump capacitor 1 negative terminal |
| 引脚 4 | C2+ — Charge pump capacitor 2 positive terminal |
| 引脚 5 | C2- — Charge pump capacitor 2 negative terminal |
| 引脚 6 | V- — Charge pump generated negative supply (-5.5V) |
| 引脚 7 | T1OUT — RS-232 driver 1 output |
| 引脚 8 | T2OUT — RS-232 driver 2 output |
| 引脚 9 | R1IN — RS-232 receiver 1 input |
| 引脚 10 | R2IN — RS-232 receiver 2 input |
| 引脚 11 | T1IN — TTL/CMOS driver 1 input |
| 引脚 12 | T2IN — TTL/CMOS driver 2 input |
| 引脚 13 | R1OUT — TTL/CMOS receiver 1 output |
| 引脚 14 | R2OUT — TTL/CMOS receiver 2 output |
| 引脚 15 | GND — Ground |
| 引脚 16 | VCC — Logic supply input (3.0V to 5.5V) |
| 引脚 17 | SHDN — Shutdown input (active low, pull high for normal operation) |
| 引脚 18 | EN — Receiver enable / driver enable control (variant-dependent) |
典型应用
SP3222ECT-L/TR 适用于 6 应用s: Notebook Computer Serial Port, Industrial PLC Serial Communication, Point-of-Sale (POS) Terminal, Battery-Powered Handheld Instrument, Embedded System Debug Console, Medical Device Serial Interface.
Notebook Computer Serial Port
The SP3222ECT-L/TR is purpose-built for notebook and palmtop computers that need a true RS-232 port from a single low-voltage logic rail. Its 3.0V-5.5V supply and 0.1 µF charge-pump capacitors eliminate the bulky ±12V supply that older RS-232 designs required, and the 1 µA shutdown mode with active receivers preserves battery life when the serial port is idle. According to the MaxLinear SP3222E/SP3232E datasheet, the part delivers true EIA/TIA-232-F swings from a 3.3V system rail, making it ideal for ultra-thin notebook chassis where PCB real estate is at a premium. The 18-SOIC wide-body package also tolerates the higher reflow profiles common in notebook mainboard assembly lines. Recommended companion parts: MAX3232EUE+ (alternate Maxim/ADI source) and SN65C3221DBR (TI 3.3V transceiver).
推荐
Industrial PLC Serial Communication
The SP3222ECT-L/TR provides robust RS-232 connectivity for industrial PLC serial ports where true EIA/TIA-232-F compliance is mandated by the legacy field-device protocol stack. Its full 2-driver/2-receiver topology supports TX, RX, RTS, and CTS handshake signals required by Modbus RTU, DF1, and ASCII serial protocols. According to the MaxLinear SP3222E/SP3232E datasheet, the integrated charge pump with 0.1 µF capacitors generates ±5.5V drivers from a 24V-to-5V industrial backplane, eliminating the external DC-DC converters that complicate fieldbus isolation. For -40°C to +85°C cabinet installations, choose the I-temp SP3222EUEI-L variant; the 18-SOIC wide-body footprint is identical to the commercial version. Recommended companion parts: MAX3222ECWN+T (Maxim/ADI second source) and ISO15D12W (isolated RS-485/RS-232 front-end).
推荐
Point-of-Sale (POS) Terminal
Point-of-sale terminals depend on reliable RS-232 links to receipt printers, barcode scanners, cash-drawer triggers, and legacy pin-pads. The SP3222ECT-L/TR's 1 µA shutdown with receivers active allows the POS terminal to detect a wake-up signal from a peripheral even when the main processor is asleep, dramatically reducing idle power consumption in retail environments. According to the MaxLinear datasheet, the part meets true EIA/TIA-232-F standards at full 120 kbps data rate, ensuring compatibility with cash-register peripherals that require strict timing budgets. The wide-body 18-SOIC package withstands the elevated reflow temperatures used in POS mainboard contract assemblers. Recommended companion parts: TRS3222ECDR (TI alternate) and ICL3222EIAZ (Renesas/Intersil alternate).
推荐
Battery-Powered Handheld Instrument
Battery-powered handheld instruments such as barcode scanners, medical data loggers, and field service tools benefit from the SP3222ECT-L/TR's combination of low-voltage operation and 1 µA shutdown current. According to the MaxLinear SP3222E/SP3232E datasheet, the high-efficiency charge pump requires only 0.1 µF capacitors at 3.3V, reducing BOM cost and PCB area while delivering ±5.5V RS-232 swings from a single Li-ion cell. The receiver-active-during-shutdown mode lets the handheld monitor a docking station or external modem with only microamp drain, dramatically extending field-deployment intervals. The 0°C to +70°C commercial operating range covers typical handheld thermal envelopes. Recommended companion parts: SP3222ECT-L (tube-packaged variant for prototype builds) and MAX3222ECWN+T (Maxim/ADI industrial alternate).
推荐
Embedded System Debug Console
Embedded designs using ARM Cortex-M, RISC-V, or ESP32 host processors expose a UART debug console that can be routed through an RS-232 transceiver to a legacy DB9 serial port for terminal access. The SP3222ECT-L/TR provides true EIA/TIA-232-F levels from a 3.3V MCU rail with only four 0.1 µF capacitors, making it the smallest-footprint solution for production debug consoles. According to the MaxLinear datasheet, the 120 kbps guaranteed data rate covers all standard CLI baud rates from 9,600 to 115,200 with margin. The shutdown pin can be tied to a GPIO so the MCU can power-gate the console when not in use, drawing only 1 µA. Recommended companion parts: FT232RL (USB-to-UART bridge) and SP3232ECY-L (same MaxLinear family, 3-driver/5-receiver).
推荐
Medical Device Serial Interface
Medical devices such as patient monitors, infusion pumps, and diagnostic analyzers rely on RS-232 ports to connect to central stations and service laptops. The SP3222ECT-L/TR provides true EIA/TIA-232-F compliance with enhanced ESD protection on the RS-232 pins, reducing field failures from electrostatic discharge during cable mating in clinical environments. According to the MaxLinear SP3222E/SP3232E datasheet, the 1 µA shutdown current is critical for battery-backed medical devices that must remain in standby for months between service events. For IEC 60601-1 medical safety compliance, pair the SP3222ECT-L/TR with an isolated DC-DC front end. Recommended companion parts: MAX3222ECWN+T (Maxim/ADI medical-grade alternate) and ADuM1411ARWZ (quad-channel digital isolator).
推荐
推荐产品汇总
工程参考数据： SP3222ECT-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 | SP3222ECT-L | SP3232ECY-L | MAX3222ECWN+T | ICL3222EIAZ | TRS3222ECDR |
|---|---|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | MaxLinear | Maxim Integrated | Renesas Electronics | Texas Instruments |
| Package | 18-SOIC (300 mil, 7.50 mm) | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same | 18-SOIC (300 mil) - same |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 3 / 5 | 2 / 2 | 2 / 2 | 2 / 2 |
| Supply Voltage | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V | 3.0V to 5.5V |
| Data Rate | 120 kbps | 120 kbps | 120 kbps | 120 kbps | 250 kbps | 250 kbps |
| Shutdown Current | 1 µA (receivers active) | 1 µA | 1 µA | 1 µA | 1 µA | 1 µA |
| Charge Pump Capacitors | 0.1 µF (3.3V) | 0.1 µF | 0.1 µF | 0.1 µF | 0.1 µF | 0.1 µF |
| Operating Temperature | 0°C to +70°C | 0°C to +70°C | 0°C to +70°C | 0°C to +70°C | -40°C to +85°C | 0°C to +70°C |
| Standards Compliance | EIA/TIA-232-F | EIA/TIA-232-F | EIA/TIA-232-F | EIA/TIA-232-F | EIA/TIA-232-F | EIA/TIA-232-F |
关键差异点
- Lowest BOM count for ±5V RS-232 from 3.3V rail （对比 TRS3222ECDR)
- Receivers remain functional during 1 µA shutdown （对比 MAX3222ECWN+T)
- Wide-body 18-SOIC with second-source availability （对比 ICL3222EIAZ)
设计说明
Place the four charge-pump capacitors (C1, C2, plus the reservoir caps on V+ and V-) as close as possible to the C1+, C1-, C2+, C2-, V+, and V- pins to minimize parasitic inductance. Use 0.1 µF X5R or X7R ceramic capacitors with a voltage rating of at least 16V to handle the charge-pump switching transients. Keep the charge-pump traces short and away from sensitive analog signal traces to prevent switching noise from coupling into the receiver inputs.
Decouple the VCC pin with a 0.1 µF ceramic capacitor plus a bulk 1 µF to 10 µF tantalum or ceramic capacitor, placed within 5 mm of the supply pin. According to the MaxLinear datasheet, VCC must remain within 3.0V to 5.5V during transient load steps. The shutdown pin (/SHDN) must be tied high to VCC through a 100 kΩ pull-up resistor if the shutdown feature is not used, otherwise the part remains in shutdown and drivers are disabled.
Do not use the SP3222ECT-L/TR above 120 kbps if the load exceeds 3 kΩ combined with 2500 pF cable capacitance - this exceeds the RS-232 slew-rate limit and can corrupt data. For higher data rates, choose the SP3222E 235 kbps variant or a 1 Mbps SP339E part. Also, never leave the shutdown pin floating: an undriven /SHDN can drift below the logic threshold and disable the drivers, which is the most common cause of 'dead' RS-232 ports in field returns.
Route the RS-232 driver outputs (T1OUT, T2OUT) and receiver inputs (R1IN, R2IN) on the cable side of the PCB, separated from the TTL/CMOS logic side (T1IN, T2IN, R1OUT, R2OUT). Maintain at least 3 mm of creepage between the RS-232 pins and the logic pins, and consider a ground guard trace around the ESD-sensitive RS-232 pins tied to chassis ground at the DB9 connector shell. The 18-SOIC wide-body package provides natural trace-routing room for industrial isolation barriers.
The SP3222ECT-L/TR's charge pump generates ±5.5V from a 3.3V supply, which is sufficient for true RS-232 swings but only 1V margin above the EIA/TIA-232-F minimum requirement of ±5V. At high load currents or low VCC, the V+ and V- rails can sag below ±5V, causing marginal receivers to fail. Measure V+ and V- under worst-case load and supply conditions during design validation to ensure compliance.
合规信息
RoHS compliant per distributor listings (DigiKey, Mouser, JLCPCB). Not AEC-Q100 qualified - this is a commercial-grade part; for automotive applications use an AEC-Q100 qualified RS-232 transceiver. Lead-free and halogen-free per JLCPCB and Octopart listings.
