SP3232EBCN-L/TR - 250 kbps True RS-232 Transceiver, 2/2, 16-SOIC | MaxLinear
MPN： SP3232EBCN-L/TR ✓ 啟用中SP3232EBCN-L/TR 概覽
An RS-232 transceiver is the physical-layer bridge between a logic-level UART and a differential, bipolar RS-232 port. RS-232 is a point-to-point, single-ended-plus-ground signalling standard defined in EIA/TIA-232-F; the transceiver's job is to convert TTL/CMOS logic levels into RS-232 levels on transmit and back again on receive. In the signal-chain hierarchy, an RS-232 transceiver sits below the UART controller and above the connector, inside the broader class of interface ICs and line-driver/receiver devices.
Key features include a high-efficiency on-chip charge-pump supply that needs only 0.1 uF capacitors, true EIA/TIA-232-F compliance down to 3.0 V, 250 kbps transmission rate under load, 15 kV ESD protection on all bus pins, and a low-power shutdown mode drawing about 1 uA with the receivers still active. A single charge-pump and dual-pump topology eliminates the need for an external -12 V supply.
The SP3232EB series is built for portable and hand-held equipment, where a single 3.3 V or 5 V rail must drive a legacy RS-232 port. The device also suits industrial data acquisition, instrumentation, point-of-sale terminals and USB-to-RS-232 bridging designs. Its 16-pin narrow SOIC body and standard pinout allow direct placement on existing RS-232 interface boards.
A typical implementation places the transceiver between a microcontroller UART and a DB9 or RJ45-style RS-232 connector, with 0.1 uF charge-pump capacitors close to the V+ and V- pins and 100 nF decoupling on the supply. Pay attention to RS-232 ground referencing in long cable runs: the receiver tolerates a common-mode range, but ground loops in industrial cabinets remain the dominant source of data errors.
This page consolidates parametric detail, drop-in alternatives in the same SOIC-16 footprint, and practical layout guidance that a datasheet alone does not present side by side.
直接替換替代品，適用於 SP3232EBCN-L/TR — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SP3232EBCN-L/TR （相同外形與佔位） — 差異在於 Package, Mounting Type, Operating Temperature, RoHS Status, Number of Drivers.
SP3232EEN-L/TR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →SP3232ECY-L/TR
✅ 直接替換 ⚠️ 規格未經驗證聯絡詢價
查看資料表 →MAX232ACWE+
✅ 直接替換📋 參考替代品（不在目錄中）
MAX232NSR
✅ 直接替換聯絡詢價
查看資料表 →MAX211IDBR
✅ 直接替換聯絡詢價
查看資料表 →SP3232EBCN-L/TR 規格
| Number of Drivers/Receivers | 2/2 |
| Transceiver Type | Full duplex RS-232 transceiver |
| Supply Voltage Range | 3 V to 5.5 V |
| 資料速率 | 250 kbps under load |
| ESD Protection | 15 kV on RS-232 pins |
| Standards Compliance | True EIA/TIA-232-F |
| Supply Topology | On-chip charge pump, single supply |
| Charge-Pump Capacitor | 0.1 uF per pump node |
| Shutdown Supply Current | 1 uA with receivers active |
| 封裝 / 外殼 | 16-SOIC (0.154 in, 3.90 mm width) |
| Packaging | Tape and reel (TR) |
| 安裝類型 | Surface mount (SMD/SMT) |
| 工作溫度 | 0 °C to +70 °C |
| Automotive Qualification | Not AEC-Q100 qualified |
| RoHS 狀態 | RoHS details listed on product listings |
SP3232EBCN-L/TR 16-soic (0.154 in, 3.90 mm width) 腳位配置指南
SP3232EBCN-L/TR（16-soic (0.154 in, 3.90 mm width) 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SP3232EBCN-L/TR.
請參閱 資料表 以查看完整腳位配置。
典型應用
SP3232EBCN-L/TR 適用於 6 應用s: USB-to-RS-232 Port Adapters, Portable Test and Measurement Instruments, Industrial Data Acquisition Terminals, Point-of-Sale and Retail Peripherals, Programmable Power Supply and Bench Equipment, Industrial Sensor and Actuator Nodes.
USB-to-RS-232 Port Adapters
The SP3232EBCN-L/TR fits where a USB-to-serial bridge needs a standards-compliant RS-232 port rather than a bare TTL UART. Two drivers and two receivers per package cover the full set of TXD, RXD, RTS and CTS handshaking lines of a PC-style DB9 connector, so one IC replaces four discrete parts. The 3.0 V to 5.5 V operating range lets the adapter share a 3.3 V regulator with the USB controller, while the 250 kbps data rate comfortably exceeds the 115.2 kbaud common on legacy RS-232 peripherals and keeps up with 460.8 kbaud industrial adapters. The 15 kV ESD protection is valuable because the RS-232 connector is the most exposed point on the board.
推薦
Portable Test and Measurement Instruments
Hand-held oscilloscopes, logic analysers and process meters increasingly ship with legacy RS-232 service ports because instrument software already speaks that protocol. The SP3232EBCN-L/TR was designed for portable equipment: the on-chip charge pump needs only 0.1 uF capacitors and no external negative supply, which keeps the board area and quiescent current low in a battery-powered enclosure. The 250 kbps rate supports fast transfer of captured waveforms and log files over an instrument PC link, and the shutdown mode drawing about 1 uA with receivers still active allows the port to be powered down between measurements without losing an incoming connection.
推薦
Industrial Data Acquisition Terminals
Data loggers and terminal blocks that must talk to legacy supervisory systems typically expose an RS-232 port alongside RS-485. Using the SP3232EBCN-L/TR for the RS-232 channel alongside an RS-485 transceiver simplifies the power tree, because both parts can sit on a 3.3 V or 5 V rail and share the same decoupling strategy. The 250 kbps rate supports polling protocols that return large record buffers, and the true EIA/TIA-232-F compliance with 15 kV ESD handling suits cabinets where the RS-232 cable is shorter than the RS-485 run but still subject to industrial noise. Note the 0 °C to +70 °C commercial temperature rating when deploying in unheated cabinets.
推薦
Point-of-Sale and Retail Peripherals
Point-of-sale terminals, scales, barcode scanners and receipt printers in retail environments still expose RS-232 ports for peripheral chaining, and these cables are frequently handled by staff and customers. The SP3232EBCN-L/TR addresses that use case with 15 kV ESD protection on the bus pins, which greatly reduces the failure rate compared with unprotected transceivers, and a 250 kbps rate that keeps transaction latency low when a receipt printer streams large jobs. The narrow SOIC-16 footprint leaves board space for the connector and its mechanical retention, and the 3.0 V to 5.5 V supply range permits a single-regulator design across the product family.
推薦
Programmable Power Supply and Bench Equipment
Bench power supplies, electronic loads and calibration fixtures commonly offer an RS-232 command interface so that legacy PC software can automate measurements. The SP3232EBCN-L/TR provides the driver and receiver pairs needed for a full duplex command port, and the 250 kbps rate allows dense SCPI command streams to be sent without flow-control stalls. Because the device runs from 3.3 V, the interface can be powered from the same low-noise rail as the instrument control section rather than requiring a legacy plus/minus 5 V supply, which simplifies the analogue side of the instrument and reduces heat inside a vented enclosure.
推薦
Industrial Sensor and Actuator Nodes
Remote sensor hubs and actuator controllers that report over a wired RS-232 link benefit from a transceiver that tolerates a single low-voltage rail and survives industrial ESD events on long cable runs. The SP3232EBCN-L/TR combines 15 kV ESD protection with true EIA/TIA-232-F compliance, and its 250 kbps rate is well matched to periodic telemetry frames rather than continuous streaming. A node built around a 3.3 V microcontroller therefore needs no negative rail, and the 0.1 uF charge-pump capacitors can be placed close to the IC, which helps when the node board is small and the enclosure shares a ground with switching machinery.
推薦
推薦產品摘要
工程參考資料，適用於 SP3232EBCN-L/TR — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SP3232EEN-L/TR | SP3232ECY-L/TR | MAX232ACWE+ | MAX232NSR | MAX211IDBR |
|---|---|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | MaxLinear | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | SOIC-16 (narrow, 0.154 in / 3.90 mm) | SOIC-16 (narrow) - same | SOIC-16 (narrow) - same | SOIC-16 (narrow) - same | SOIC-16 (narrow) - same | SOIC-16 (narrow) - same |
| Number of Drivers/Receivers | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 | 2/2 |
| Supply Voltage Range | 3 V to 5.5 V | 3 V to 5.5 V | 3 V to 5.5 V | Plus/minus 5 V | Plus/minus 5 V | Plus/minus 5 V |
| Charge-Pump / Negative Rail Generation | On-chip charge pump, 0.1 uF capacitors, no external negative supply | On-chip charge pump, 0.1 uF capacitors | On-chip charge pump, 0.1 uF capacitors | On-chip charge pump, external plus/minus 5 V rails | On-chip charge pump, external plus/minus 5 V rails | On-chip charge pump, external plus/minus 5 V rails |
| Packing / Mounting | Tape & reel, surface mount | Tape & reel, surface mount | Tape & reel, surface mount | Tape & reel, surface mount | Tape & reel, surface mount | Tape & reel, surface mount |
主要差異化特點
- Operates from a single 3.0 V to 5.5 V rail while still delivering true RS-232 levels (對比MAX232NSR)
- 250 kbps transmission rate under load, more than twice the speed of the lower-cost family member (對比SP3232EEN-L/TR)
- 15 kV ESD protection integrated on the RS-232 bus pins (對比MAX232ACWE+)
- Only 0.1 uF charge-pump capacitors and no external negative supply (對比MAX211IDBR)
設計說明
Place the 0.1 uF charge-pump capacitors on the V+ and V- pins as close to the package as the layout allows, with the ground pad of each capacitor returning directly to the device ground reference. Long pump traces behave like an antenna and add ripple to the generated negative rail, which shows up as jitter on the driver output and as occasional receive errors at the far end of the cable. Keep the RS-232 driver and receiver pins away from switching nodes and from the clock and digital return paths of the host processor, and route the connector-side nets as a matched, isolated group with a solid ground reference underneath.
Decouple the supply with a 100 nF ceramic capacitor close to VCC and a bulk 1 uF to 10 uF capacitor nearby, and connect the RS-232 connector ground to the board ground at a single point rather than through the cable shield path of a switching stage. The SP3232EBCN-L/TR needs only 3.0 V to 5.5 V, so in 3.3 V designs the transceiver can share the rail with the MCU; note however that RS-232 driver outputs swing roughly plus 8 V to minus 8 V relative to ground, and that current is drawn from the charge pump rather than from the logic supply, so the rail still needs to tolerate the transient. Confirm the datasheet current figures against your actual cable loading before sizing the regulator.
Two mistakes account for most field failures of RS-232 designs. First, substituting a plus/minus 5 V MAX232-class part into a 3.3 V board: the pinout is similar but the supply requirement is not, and the circuit will not start. Second, assuming the logic side is 5 V tolerant when it is driven from a 3.3 V MCU: the driver inputs on the SP3232EB family are referenced to VCC, so confirm the logic thresholds in the datasheet. Also verify the ground reference at the far end of the cable, since a long RS-232 run with a large ground potential difference causes receive errors that look like baud-rate faults.
An RS-232 cable behaves as an unbalanced antenna, so radiated emissions are dominated by the driver edge rate and by cable length. Terminate the driver output with the recommended series network near the IC, and prefer a shielded cable with a chassis-grounded shield at the connector end rather than a signal-ground connection, to keep common-mode current out of the board ground. If the port must coexist with switching regulators or a high-speed digital bus on the same board, increase the spacing between the RS-232 traces and the noisy nets, and consider a ferrite or common-mode choke in the cable path to reduce both emissions and susceptibility.
合規資訊
RoHS details are listed for the SP3232EB family on the MaxLinear product page, but no explicit compliance statement, REACH declaration or AEC-Q100 qualification was available for this ordering code. The 0 °C to +70 °C rating places it in commercial, not automotive, grade.
