SP335EER1-L/TR - Multiprotocol RS-232/RS-485/RS-422 Transceiver | MaxLinear
料号： SP335EER1-L/TR ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $5.42 | $5.42 |
| 10 | $4.87 | $48.70 |
| 100 | $4.35 | $435.00 |
| 500 | $3.91 | $1,955.00 |
| 1,000 | $3.48 | $3,480.00 |
SP335EER1-L/TR 概述
A multiprotocol transceiver is a single-chip interface IC that allows a UART, MCU, or FPGA to communicate over multiple serial standards (RS-232 single-ended, RS-422 differential, RS-485 half/full duplex) through one connector. Compared with dedicated transceivers, it eliminates external mode-switching FETs or relays, reduces BOM count, and enables a single PCB layout to serve multiple cable protocols. Multiprotocol transceivers belong to the broader category of line drivers / receivers within the wired-communication interface family.
Key features include integrated 120 ohm cable termination (selectable via the TERM pin), a half/full duplex mode pin, mode selection between RS-485 and RS-232, internal charge pump for RS-232 driver voltage generation, and an exposed thermal pad for enhanced power dissipation. The device supports up to 32 transceivers on a single RS-485 bus and is offered in industrial -40 C to +85 C operating temperature range.
The SP335EER1-L/TR uses a BiCMOS process with on-chip charge-pump regulators to generate the RS-232 +/-5 V output swing from a single 3.3 V or 5 V rail. The differential drivers in RS-485/RS-422 mode deliver a 1.5 V minimum differential output across 27 ohm load, supporting the TIA/EIA-485 standard. ESD protection on the bus pins exceeds +/-15 kV HBM (per the manufacturer datasheet, SP335E revision 1.02, 2017).
Typical applications include multiprotocol industrial serial ports, point-of-sale terminals, building automation controllers, RS-232 to RS-485 protocol converters, and embedded communication modules that must interoperate with legacy and modern fieldbus equipment. The integrated termination and flexible mode control make it well suited for mixed-protocol field service equipment.
When designing with this part, place the four charge-pump capacitors (typically 0.1 uF or 1 uF) as close to the C1+ / C1- / C2+ / C2- pins as possible. Use a solid ground plane beneath the exposed pad and stitch vias around the perimeter for thermal relief. Mode pin logic transitions should occur only when the drivers are disabled to avoid bus contention.
This page synthesizes distributor pricing, drop-in alternatives, design notes, and parametric comparisons drawn from MaxLinear datasheets and DigiKey/Mouser/Octopart listings as of 2026-10-10.
直接替换替代料： SP335EER1-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：
SP335EER1-L
✅ 直接替换📋 参考替代料（不在目录中）
MAX3162EEAI
✅ 直接替换📋 参考替代料（不在目录中）
MAX3160EEAI
✅ 直接替换📋 参考替代料（不在目录中）
LTC2873IUFD
✅ 直接替换📋 参考替代料（不在目录中）
XR3160EU-F
✅ 直接替换📋 参考替代料（不在目录中）
SP335EER1-L/TR 规格参数
| Product Type | Multiprotocol Serial Transceiver |
| Protocols Supported | RS-232, RS-422, RS-485 |
| Number of Drivers / Receivers | 1/1 (RS-232), 2/2 (RS-485/RS-422) |
| Duplex | Full Duplex |
| Supply Voltage Range | 3.0 V to 5.5 V |
| RS-232 Data Rate | 1 Mbps (max) |
| RS-485 / RS-422 Data Rate | 20 Mbps (max) |
| Integrated Cable Termination | 120 ohm, selectable via TERM pin |
| External Capacitors Required | 4 charge-pump capacitors |
| 封装 | 32-QFN (5x5 mm) with exposed thermal pad |
| 安装类型 | Surface Mount |
| 工作温度 | -40 C to +85 C |
| Number of Bus Nodes (RS-485) | Up to 32 |
| RoHS 状态 | Compliant |
| Lead Free | Yes |
SP335EER1-L/TR 引脚配置
| 引脚 1 | C1+ — Charge-pump capacitor positive terminal 1 |
| 引脚 2 | V+ — Charge-pump generated +5.5 V output |
| 引脚 3 | C1- — Charge-pump capacitor negative terminal 1 |
| 引脚 4 | C2+ — Charge-pump capacitor positive terminal 2 |
| 引脚 5 | C2- — Charge-pump capacitor negative terminal 2 |
| 引脚 6 | V- — Charge-pump generated -5.5 V output |
| 引脚 7 | VCC — Supply input (3.0 V to 5.5 V) |
| 引脚 8 | GND — Ground |
| 引脚 9 | R1OUT — RS-232 receiver 1 output |
| 引脚 10 | R2OUT — RS-485/RS-422 receiver 2 output |
| 引脚 11 | R3OUT — RS-485/RS-422 receiver 3 output |
| 引脚 12 | T1IN — RS-232 driver 1 input |
| 引脚 13 | T2IN — RS-485/RS-422 driver 2 input |
| 引脚 14 | T3IN — RS-485/RS-422 driver 3 input |
| 引脚 15 | 485/232 — Mode select: high = RS-485, low = RS-232 |
| 引脚 16 | HALF/FULL — RS-485 duplex select |
| 引脚 17 | TERM — 120 ohm termination enable |
| 引脚 18 | DE — Driver enable (RS-485/RS-422) |
| 引脚 19 | RE — Receiver enable (active low) |
| 引脚 20 | T1OUT — RS-232 driver 1 output |
| 引脚 21 | T2OUT — RS-485/RS-422 driver 2 output (Y) |
| 引脚 22 | T2OUTB — RS-485/RS-422 driver 2 inverting output (Z) |
| 引脚 23 | T3OUT — RS-485/RS-422 driver 3 output (Y) |
| 引脚 24 | T3OUTB — RS-485/RS-422 driver 3 inverting output (Z) |
| 引脚 25 | R1IN — RS-232 receiver 1 input |
| 引脚 26 | R2IN — RS-485/RS-422 receiver 2 non-inverting input |
| 引脚 27 | R2INB — RS-485/RS-422 receiver 2 inverting input |
| 引脚 28 | R3IN — RS-485/RS-422 receiver 3 non-inverting input |
| 引脚 29 | R3INB — RS-485/RS-422 receiver 3 inverting input |
| 引脚 30 | NC — Not connected |
| 引脚 31 | NC — Not connected |
| 引脚 32 | NC — Not connected |
典型应用
SP335EER1-L/TR 适用于 6 应用s: Multiprotocol Industrial Serial Port, RS-232 to RS-485 Protocol Converter, Point-of-Sale (POS) Terminal Interface, Building Automation Controller, Field Service Diagnostic Equipment, Embedded Communication Module (SoM).
Multiprotocol Industrial Serial Port
The SP335EER1-L/TR is well suited for multiprotocol industrial serial ports that must communicate with both legacy RS-232 equipment and modern RS-485 fieldbus devices from a single connector. With 20 Mbps RS-485 data rate and 1 Mbps RS-232 data rate plus mode selection via the RS-485/RS-232 pin, the part eliminates external switching FETs and protocol-conversion circuitry. Designers place the IC between the MCU UART and the DB9 or terminal-block connector, with the four 0.1 uF charge-pump capacitors within 5 mm of the C1+/C1-/C2+/C2- pins. The integrated selectable 120 ohm termination reduces BOM count by one resistor network per port. Operating across -40 C to +85 C, the SP335EER1-L/TR handles factory-floor temperature swings without derating.
推荐
RS-232 to RS-485 Protocol Converter
The SP335EER1-L/TR enables compact bidirectional protocol converters that bridge RS-232 hosts to RS-485 multidrop networks. The 1/1 RS-232 channel plus 2/2 RS-485 channels handle conversion in both directions without an additional line-driver IC. Industrial converter designs place the part between the DB9 RS-232 input and the RS-485 twisted-pair output, with the HALF/FULL pin set to HALF for two-wire RS-485 buses and TERM enabled for end-of-line nodes. The 3.0 V to 5.5 V supply range supports both 3.3 V MCU rails and legacy 5 V designs. Up to 32 nodes per bus per TIA/EIA-485 allow building daisy-chained converter networks in field-service installations.
推荐
Point-of-Sale (POS) Terminal Interface
The SP335EER1-L/TR fits point-of-sale terminal serial interfaces that connect to receipt printers, barcode scanners, and cash-drawer modules using a mix of RS-232 and RS-485. Its 20 Mbps RS-485 speed supports high-throughput scanner communication while the 1 Mbps RS-232 channel handles legacy printer protocols. The 32-QFN 5x5 mm footprint saves board space inside compact POS enclosures. Mode pins allow the system firmware to switch protocols at runtime, supporting flexible peripheral attachment without hardware reconfiguration. RoHS compliance and MaxLinear long-term product support make the SP335EER1-L/TR a reliable choice for retail equipment with 7-10 year deployment lifetimes.
推荐
Building Automation Controller
The SP335EER1-L/TR is ideal for building automation controllers (BACnet, Modbus, proprietary RS-485 bus networks) that must also service RS-232 service ports for technician laptops. The integrated 120 ohm cable termination is selectable via the TERM pin, which is critical for BACnet MS/TP and Modbus RTU networks requiring end-of-line termination only at bus endpoints. Industrial -40 C to +85 C operation covers unheated equipment closets. The 3.3 V or 5 V supply range matches the typical 3.3 V MCU rails used in modern HVAC controllers. Designers can implement both the fieldbus RS-485 port and the technician RS-232 service port on a single 32-QFN footprint, reducing PCB area by 50 percent versus two single-protocol transceivers.
推荐
Field Service Diagnostic Equipment
The SP335EER1-L/TR supports portable field-service diagnostic tools that connect to industrial equipment over RS-232, RS-422, or RS-485 using a single ruggedized connector. Field technicians can select protocol via firmware, eliminating cable adapters. The 20 Mbps RS-422/RS-485 capability handles high-speed data acquisition from modern PLCs, while the RS-232 channel maintains compatibility with legacy equipment. The exposed thermal pad of the 32-QFN package supports sustained 20 Mbps operation without thermal throttling. Low standby current and 3.0 V to 5.5 V supply range enable battery-powered handheld diagnostic tools. The integrated charge pump eliminates four bulky RS-232 driver-voltage components, freeing board space for the battery and display.
推荐
Embedded Communication Module (SoM)
The SP335EER1-L/TR fits System-on-Module (SoM) carrier boards that expose a multiprotocol serial header to system integrators. By integrating RS-232, RS-422, and RS-485 on a single transceiver IC, the SoM offers maximum flexibility without dedicating board area to three single-protocol parts. The 32-QFN 5x5 mm footprint fits easily beneath a standard serial-port header. Mode pins can be tied to GPIOs on the SoM, allowing runtime protocol selection. Industrial -40 C to +85 C temperature range supports SoM deployment in cabinets and outdoor enclosures. MaxLinear long-term supply guarantees protect SoM manufacturers from forced redesigns during 5-7 year product lifecycles.
推荐
推荐产品汇总
工程参考数据： SP335EER1-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 | SP335EER1-L | MAX3162EEAI | MAX3160EEAI | LTC2873IUFD | XR3160EU-F |
|---|---|---|---|---|---|---|
| Brand | MaxLinear | MaxLinear | Analog Devices | Analog Devices | Analog Devices | MaxLinear |
| Package | 32-QFN (5x5 mm) | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same | 32-QFN (5x5 mm) - same |
| Supply Voltage Range | 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 | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| RS-485 Data Rate | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps | 20 Mbps |
| RS-232 Data Rate | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps | 1 Mbps |
| Integrated 120 ohm Termination | Yes (TERM pin) | Yes (TERM pin) | No (external required) | No (external required) | Yes (selectable) | Yes (TERM pin) |
| External Charge-Pump Capacitors | 4 | 4 | 4 | 4 | 4 | 4 |
| Operating Temperature | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C | -40 C to +85 C |
关键差异点
- Integrated selectable 120 ohm cable termination （对比 MAX3162EEAI)
- Same MaxLinear family pin compatibility （对比 XR3160EU-F)
- Higher ESD tolerance than MAX3160EEAI （对比 MAX3160EEAI)
设计说明
Place the four charge-pump capacitors (C1+, C1-, C2+, C2-) within 5 mm of their respective IC pins and connect the ground side directly to the ground pour. Keep capacitor traces short and wide to minimize parasitic inductance that can degrade RS-232 driver output swing at high data rates. The exposed thermal pad (pin 33) MUST be soldered to a continuous ground plane with at least 9 thermal vias for proper heat dissipation.
Use 100 ohm differential impedance-controlled traces for RS-485/RS-422 signals (T2OUT/T2OUTB, R2IN/R2INB). Maintain a constant differential pair geometry and avoid 90-degree bends. Place a 100 nF decoupling capacitor within 3 mm of the VCC pin, plus a 10 uF bulk capacitor on the supply rail. For end-of-line bus nodes, enable the integrated 120 ohm termination via the TERM pin; for mid-bus nodes, leave TERM floating to avoid bus loading.
Mode pin transitions (485/232, HALF/FULL) must occur only when DE and RE are both disabled to avoid bus contention or output driver conflicts. Do not exceed 32 nodes on a single RS-485 bus (TIA/EIA-485 limit). For RS-232 mode, the charge-pump capacitors must be rated for at least 16 V DC to withstand the generated V+ and V- rails; X7R ceramic 0.1 uF or 1 uF parts are recommended. Do not apply external voltage to V+ or V- pins.
合规信息
RoHS compliant per MaxLinear product page. AEC-Q100 not applicable (industrial/consumer transceiver, not automotive qualified). REACH compliant per MaxLinear declaration.
