MAX3232ESE+T - 3.0-5.5V RS-232 Transceiver, 1Mbps, 16-SOIC | Maxim
料号： MAX3232ESE+T ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $3.87 | $3.87 |
| 10 | $3.42 | $34.20 |
| 100 | $2.78 | $278.00 |
| 500 | $2.31 | $1,155.00 |
| 1,000 | $1.96 | $1,960.00 |
MAX3232ESE+T 概述
An RS-232 transceiver is a line driver/receiver IC that translates logic-level (TTL/CMOS) signals from a microcontroller or UART to the +/-5 V to +/-15 V signaling required by the EIA/TIA-232 standard, and vice versa. RS-232 transceivers sit between the data terminal equipment (DTE) and data communication equipment (DCE) and form part of the physical layer of the UART/serial interface family, alongside RS-422 and RS-485 transceivers for longer-distance differential links.
Key features of the MAX3232ESE+T include 1 Mbps guaranteed data rate (250 KB/s in the older 160 ns slew-rate version), low supply current of 1 mA typical, an enhanced ESD protection of +/-15 kV HBM on the RS-232 bus pins, and true RS-232 output swing with automatic power-down shutdown. It also provides a low-dropout transmitter output stage so true RS-232 levels are maintained even when VCC drops to 3.0 V.
The architecture uses a regulated dual charge pump and four small 0.1 µF ceramic capacitors, eliminating the bulky +/-12 V rails and 1 µF / 10 µF pump capacitors required by classic MAX232 designs. This shrinks the BOM and PCB area and enables portable 3.3 V-only systems to drive full-spec RS-232 links without auxiliary supplies. The part is pin-compatible with the industry-standard MAX232 family.
Typical applications include battery-powered serial ports on portable equipment, embedded UART-to-RS-232 bridges on 3.3 V microcontroller boards (e.g. PIC32 and STM32 designs), industrial control and point-of-sale terminals, GPS receiver interfaces, and legacy PC COM-port replacements. Designers of lithium-ion-powered products appreciate the 1 mA supply current.
When designing with this part, place the four 0.1 µF charge-pump capacitors (C1-C4) as close as possible to the package and keep the RS-232 trace lengths short. Decouple VCC with 0.1 µF in parallel with 1 µF, and add a series ferrite or TVS if the link will see ESD events beyond the +/-15 kV HBM rating. Note that MAX3232ESE (slew-rate-limited, 160 ns version) is the 250 KBps part; the MAX3232E and 'E' suffix are typically the 1 Mbps variants - verify the exact suffix on the order code before committing to a 1 Mbps design.
This page synthesizes distributor pricing, drop-in cross-brand alternatives (TI TRSF3232, Exar SP3232, TI TRS2023), application context not found in the datasheet alone, and an engineering-grade pinout to support sourcing, design-in, and drop-in substitution decisions.
直接替换替代料： MAX3232ESE+T ——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： MAX3232ESE+T （相同外形与封装尺寸） ——差异在于 Function, Operating Temperature, Package.
快速对比工具——选择替代料号进行并排对比：
MAX3232CSE+T
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX3232ESE+TG035
✅ 直接替换✓ 有现货
$2.98 / 个
查看数据手册 →TRSF3232IPWR
✅ 直接替换📋 参考替代料（不在目录中）
SP3232EEN-L/TR
✅ 直接替换📋 参考替代料（不在目录中）
TRS2023IPWR
✅ 直接替换📋 参考替代料（不在目录中）
MAX3232ESE+T 规格参数
| 功能 | RS-232 Transceiver (2 drivers / 2 receivers) |
| Protocol | RS-232 (EIA/TIA-232) |
| Data Rate (max) | 1 Mbps |
| Supply Voltage VCC | 3.0 V to 5.5 V |
| 电源电流 | 1 mA typical |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| ESD Protection (RS-232 pins) | +/-15 kV HBM |
| Charge Pump Capacitors | 4 x 0.1 uF external |
| 工作温度 | -40C to +85C (E temp grade) |
| 封装 | 16-SOIC (NSOIC, 0.150 inch) |
| 安装类型 | Surface Mount |
| RoHS 状态 | Compliant |
| Shutdown / Enable | No (always-on; see MAX3222/MAX3241 for SHDN) |
MAX3232ESE+T 引脚配置
| 引脚 1 | C2+ — Charge-pump capacitor 2 positive terminal |
| 引脚 2 | C1+ — Charge-pump capacitor 1 positive terminal |
| 引脚 3 | C2- — Charge-pump capacitor 2 negative terminal |
| 引脚 4 | V+ — Charge-pump generated +5.5V supply |
| 引脚 5 | C1- — Charge-pump capacitor 1 negative terminal |
| 引脚 6 | V- — Charge-pump generated -5.5V supply |
| 引脚 7 | T2OUT — RS-232 driver 2 output |
| 引脚 8 | T2IN — RS-232 driver 2 input (logic) |
| 引脚 9 | R2IN — RS-232 receiver 2 input |
| 引脚 10 | R2OUT — RS-232 receiver 2 output (logic) |
| 引脚 11 | T1IN — RS-232 driver 1 input (logic) |
| 引脚 12 | R1OUT — RS-232 receiver 1 output (logic) |
| 引脚 13 | R1IN — RS-232 receiver 1 input |
| 引脚 14 | T1OUT — RS-232 driver 1 output |
| 引脚 15 | GND — Ground |
| 引脚 16 | VCC — Supply voltage 3.0 V to 5.5 V |
典型应用
MAX3232ESE+T 适用于 6 应用s: Battery-Powered Portable Serial Port, Embedded MCU UART-to-RS-232 Bridge, Industrial Point-of-Sale (POS) Terminal, GPS Receiver Interface, Legacy PC COM-Port Replacement, Embedded Instrumentation and Test Equipment.
Battery-Powered Portable Serial Port
The MAX3232ESE+T's 3.0 V to 5.5 V single-supply operation and integrated charge pump with four 0.1 uF capacitors make it ideal for battery-powered portable serial ports. The typical 1 mA supply current means a 1500 mAh lithium-ion cell can power the link for thousands of hours of standby. The +/-15 kV HBM ESD rating on the RS-232 bus pins protects handheld devices from cable-discharge events. Engineers typically place the four 0.1 uF X7R pump capacitors within 3 mm of pins 2, 3, 5, 6 and route the RS-232 output traces with controlled 50 ohm characteristic impedance. Compared to the legacy MAX232, the MAX3232ESE+T eliminates the +/-12 V supply requirement and cuts pump capacitors from 1 uF/10 uF to 0.1 uF, reducing BOM cost and PCB area by roughly 60%.
推荐
Embedded MCU UART-to-RS-232 Bridge
The MAX3232ESE+T is the canonical UART-to-RS-232 bridge for 3.3 V microcontroller designs. Its 3.0 V to 5.5 V VCC range matches modern MCU IO rails including PIC32, STM32, and ESP32, eliminating level-shifters. The 1 Mbps data rate covers every standard baud rate from 9600 up to 921600, and the +/-15 kV ESD protects the MCU from cable ESD events. Design tip: keep the VCC trace short and decouple with 0.1 uF plus 1 uF ceramic within 2 mm of pin 16. Charge pump labels on the MAX3232 are C1+/C1- (pins 2/6) and C2+/C2- (pins 3/5); verify against the datasheet figure if you are porting a reference layout. For higher-density multi-port designs consider MAX3243 (3 drivers / 5 receivers).
推荐
Industrial Point-of-Sale (POS) Terminal
POS terminals, cash drawers, and barcode scanners historically connect over RS-232, and the MAX3232ESE+T's +/-15 kV HBM ESD rating plus 1 mA quiescent current suit these always-on industrial environments. The device's industrial temperature grade (-40 C to +85 C) supports heated or refrigerated retail backrooms. Engineers typically add an external TVS diode (such as SMAJ24CA) on the RS-232 bus pins for surge protection beyond the HBM rating. The 16-SOIC footprint is compatible with wave-soldered and reflow-soldered assemblies. Compared to legacy MAX232 designs, the MAX3232ESE+T removes the +/-12 V requirement, simplifying UL/IEC 60950 safety approvals by eliminating the higher-voltage rails entirely.
推荐
GPS Receiver Interface
Many GPS modules output NMEA 0183 sentences at 4800 to 115200 baud over true RS-232 levels, and the MAX3232ESE+T bridges a 3.3 V MCU UART to those levels cleanly. The 3.0 V to 5.5 V supply range allows the same board to power both 3.3 V GPS receivers and 5 V legacy GPS modules without rework. The +/-15 kV ESD protects outdoor antenna cabling from lightning-induced transients when paired with a coax-side TVS. The 1 mA supply current preserves battery life in handheld GPS data loggers. Designers often stack the MAX3232ESE+T directly behind a DB9 connector with the four 0.1 uF pump capacitors on the same board side.
推荐
Legacy PC COM-Port Replacement
The MAX3232ESE+T serves as the transceiver on USB-to-serial dongles that emulate legacy DB9-CRS-232 COM ports on modern laptops. Its 1 Mbps data rate exceeds the typical 115200 baud used by industrial software and provides headroom for proprietary high-speed protocols. The 3.3 V single-supply operation simplifies the dongle power tree, removing the need for a 5 V boost converter. The +/-15 kV HBM ESD rating on the RS-232 bus pins protects the dongle from ESD events when users hot-plug DB9 connectors. Designers should add a low-capacitance TVS array on the DB9 side for surge events beyond +/-15 kV.
推荐
Embedded Instrumentation and Test Equipment
Bench instruments, lab data loggers, and factory automation modules use the MAX3232ESE+T to provide isolated or non-isolated RS-232 ports for command-line configuration and firmware update. The 1 Mbps rate enables fast boot-loader uploads over RS-232 in production. The +/-15 kV HBM ESD and the integrated charge pump simplify the BOM. Design tip: place a 100 ohm ferrite bead on each RS-232 output for EMI suppression in laboratory environments. For galvanically isolated designs, place the MAX3232ESE+T on the field-side of an isolation barrier (such as ADM3251E or ISO3082) and route logic-side traces with controlled impedance.
推荐
推荐产品汇总
工程参考数据： MAX3232ESE+T ——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 | MAX3232CSE+T | MAX3232ESE+ | TRSF3232IPWR | SP3232EEN-L/TR | TRS2023IPWR |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Texas Instruments | MaxLinear | Texas Instruments |
| Package | 16-SOIC | 16-SOIC - same | 16-SOIC - same | 16-SOIC (PW) - same | 16-SOIC (NSOIC) - same | 16-SOIC (PW) - same |
| 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 | 3.0 V to 5.5 V | 3.0 V to 5.5 V |
| Max Data Rate | 1 Mbps | 250 kbps | 1 Mbps | 1 Mbps | 1 Mbps | 120 kbps |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 |
| Charge Pump Caps | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF | 4 x 0.1 uF |
关键差异点
- Single 3.0 V to 5.5 V supply operation with integrated charge pump （对比 MAX232 (legacy))
- 1 Mbps data rate (E-suffix) vs 250 kbps (C-suffix) （对比 MAX3232CSE+T)
- +/-15 kV HBM ESD on RS-232 bus pins （对比 TRS2023IPWR)
设计说明
Place the four 0.1 uF charge-pump capacitors (C1+/C1-/C2+/C2-) within 3 mm of the package pins 2, 3, 5, and 6 to minimize loop inductance and ripple on the generated +/-5.5 V rails. Use X7R dielectric ceramic capacitors rated for at least 16 V; Y5V or Z5U dielectrics lose capacitance at 5 V bias. Decouple VCC (pin 16) with a 0.1 uF ceramic in parallel with a 1 uF ceramic, both within 2 mm of the pin. Keep the RS-232 output traces (T1OUT, T2OUT on pins 14, 7) short and add a series ferrite bead if the cable runs more than 1 meter for EMI control.
Do not substitute MAX3232ESE+T with the MAX3232CSE+T if your UART runs above 250 kbps, because the C-suffix is the 160 ns slew-rate-limited 250 kbps variant; both share the same SOIC footprint, so a 'looks identical' substitution can silently degrade a 1 Mbps design. Similarly, do not use the legacy MAX232 in a 3.3 V-only system - it requires a 5 V supply and 1 uF / 10 uF pump capacitors that will not generate true RS-232 levels below 4.5 V. Also note the MAX3232 has no shutdown pin; if you need power-saving, choose MAX3222 (with SHDN) or MAX3241 (with auto-shutdown).
The MAX3232ESE+T's charge pump switches at roughly 250 kHz to 400 kHz, producing common-mode noise on the RS-232 outputs that can couple into adjacent analog traces. To minimize EMI, route the RS-232 outputs on a different board layer from sensitive analog signals, guarded by a ground plane. Add 100 ohm ferrite beads in series with each RS-232 output if the cable exceeds 1 meter. Place a small (10 pF to 100 pF) ceramic capacitor from each RS-232 output to ground at the connector side for additional radiated-emission suppression, but keep the total capacitive load below 2500 pF to preserve the 1 Mbps slew rate.
合规信息
RoHS and REACH compliant per Maxim/Analog Devices product page. Not AEC-Q100 qualified; for automotive RS-232 designs use MAX3232EUE/V+ or similar automotive-grade part. Operating temperature range -40 C to +85 C (E industrial temp grade).
