MAX3232ESE+T - 3.0-5.5V RS-232 Transceiver, 1Mbps, 16-SOIC | Maxim
MPN: MAX3232ESE+T ✓ Hoạt độngMAX3232ESE+T Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX3232ESE+T — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX3232ESE+T (cùng hình factor và footprint) — khác nhau ở Function, Operating Temperature, Package.
MAX3232CSE+T
✅ Drop-In ⚠️ Thông số chưa được xác minh📋 Tham chiếu thay thế (không có trong danh mục)
MAX3232ESE+TG035
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →TRSF3232IPWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
SP3232EEN-L/TR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
TRS2023IPWR
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX3232ESE+T Thông số kỹ thuật
| Chức năng | 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 |
| Điện áp cung cấp | 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 |
| Nhiệt độ hoạt động | -40C to +85C (E temp grade) |
| Hộp | 16-SOIC (NSOIC, 0.150 inch) |
| Kiểu lắp đặt | Surface Mount |
| Trạng thái RoHS | Compliant |
| Shutdown / Enable | No (always-on; see MAX3222/MAX3241 for SHDN) |
Cấu hình chân MAX3232ESE+T
| Chân 1 | C2+ — Charge-pump capacitor 2 positive terminal |
| Chân 2 | C1+ — Charge-pump capacitor 1 positive terminal |
| Chân 3 | C2- — Charge-pump capacitor 2 negative terminal |
| Chân 4 | V+ — Charge-pump generated +5.5V supply |
| Chân 5 | C1- — Charge-pump capacitor 1 negative terminal |
| Chân 6 | V- — Charge-pump generated -5.5V supply |
| Chân 7 | T2OUT — RS-232 driver 2 output |
| Chân 8 | T2IN — RS-232 driver 2 input (logic) |
| Chân 9 | R2IN — RS-232 receiver 2 input |
| Chân 10 | R2OUT — RS-232 receiver 2 output (logic) |
| Chân 11 | T1IN — RS-232 driver 1 input (logic) |
| Chân 12 | R1OUT — RS-232 receiver 1 output (logic) |
| Chân 13 | R1IN — RS-232 receiver 1 input |
| Chân 14 | T1OUT — RS-232 driver 1 output |
| Chân 15 | GND — Ground |
| Chân 16 | VCC — Supply voltage 3.0 V to 5.5 V |
Ứng dụng tiêu biểu
MAX3232ESE+T phù hợp cho 6 Áp dụngs: 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%.
Được đề xuất
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).
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX3232ESE+T — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Single 3.0 V to 5.5 V supply operation with integrated charge pump (vsMAX232 (legacy))
- 1 Mbps data rate (E-suffix) vs 250 kbps (C-suffix) (vsMAX3232CSE+T)
- +/-15 kV HBM ESD on RS-232 bus pins (vsTRS2023IPWR)
Ghi chú thiết kế
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.
Thông tin tuân thủ
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).
