MAX232CSE+T - +5V RS-232 Transceiver, 16-SOIC | Analog Devices
Référence : MAX232CSE+T ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $2.95 | $2,95 |
| 10 | $2.62 | $26,20 |
| 100 | $2.21 | $221,00 |
| 500 | $1.86 | $930,00 |
| 1 000 | $1.55 | $1 550,00 |
MAX232CSE+T Présentation
A RS-232 transceiver (line driver/receiver) is an interface IC that translates logic-level signals (typically 0/5V or 0/3.3V CMOS/TTL) to the higher-voltage bipolar signaling levels defined by the EIA/TIA-232E and V.28/V.24 standards. These standards require driver outputs above ±5V into 3 kΩ loads and receivers that translate bipolar inputs to standard logic levels. The MAX232 sits in the interface IC family within the broader integrated circuits hierarchy: interface IC > transceiver > line driver/receiver > signal conditioning IC > semiconductor.
Key features include single +5V operation eliminating the need for ±12V rails, integrated charge-pump voltage doubler/inverter requiring only four external 1 µF capacitors, true RS-232 compliant outputs (typically ±7.5V minimum), and on-board TTL/CMOS-compatible receiver inputs with 5 kΩ resistive pull-down to ground. The wide commercial operating temperature range (0 °C to +70 °C for the C-grade) suits point-of-sale terminals, industrial control consoles, and embedded serial ports.
Architecturally, the MAX232 uses a switched-capacitor charge pump (typically a dual-pump Dickson topology) with internal MOSFET switches clocked above the audio band. This generates the negative rail from the +5V supply without inductors, keeping the solution purely capacitive. Receivers employ hysteresis on their inputs to reject noise on long cables.
Typical applications include RS-232 serial ports on microcontrollers (Arduino, PIC, STM32), point-of-sale (POS) terminals, industrial control equipment, networking routers and switches with console ports, and legacy PC peripherals. The 16-SOIC narrow-body package and tape-and-reel shipping suit high-volume automated assembly.
When designing, place the four charge-pump capacitors as close to the C1+, C1-, C2+, C2- pins as possible using short traces, and use the V+ and V- pins as additional bypass. For higher data rates above 120 kb/s or extended temperature ranges, consider the MAX232E (200 kb/s, -40 °C to +85 °C) or MAX3232 (3V to 5.5V operation) families.
This page synthesizes distributor pricing, drop-in cross-brand alternatives such as the Sipex/MaxLinear SP232ACN-L/TR, and practical charge-pump layout guidance not typically consolidated in the manufacturer datasheet.
Alternatives de remplacement direct pour MAX232CSE+T — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec MAX232CSE+T (même facteur de forme et même empreinte) — différant par Package, Data Rate, ESD Protection, Operating Temperature Range, Protocol.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX232CSE+
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232EESE+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232CWE+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
SP232ACN-L/TR
✅ Remplacement direct✓ En stock
$0.5291 / unité
Voir la fiche technique →MAX3232CSE+T
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232CSE+T Spécifications
| Fonction | RS-232 Line Driver/Receiver (Transceiver) |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Protocol | RS-232 (EIA/TIA-232E, V.28/V.24) |
| Supply Voltage (Vcc) | 4.5 V to 5.5 V (single +5V supply) |
| Débit de données | 120 kb/s |
| RS-232 Driver Output Voltage | ±7.5 V minimum (typical ±9 V) into 3 kΩ load |
| Receiver Input Voltage Range | ±30 V |
| Charge Pump | Internal; requires 4 × 1 µF external capacitors |
| Plage de température de fonctionnement | 0 °C to +70 °C (commercial C-grade) |
| Boîtier | 16-pin Narrow SOIC (SOIC-N-16) |
| Type de montage | Surface Mount |
| Niveau MSL | 1 (unlimited floor life at <30 °C / 85 % RH) |
| Lead-Free / RoHS | Yes (compliant per +T suffix) |
| Packaging | Tape & Reel (T+R) |
Configuration des broches de MAX232CSE+T
| Broche 1 | C1+ — Charge-pump flying capacitor positive terminal (positive pump) |
| Broche 2 | V+ — Charge-pump generated +2×VCC supply for driver output stages (~+9V) |
| Broche 3 | C1- — Charge-pump flying capacitor negative terminal (positive pump) |
| Broche 4 | C2+ — Charge-pump flying capacitor positive terminal (negative pump) |
| Broche 5 | C2- — Charge-pump flying capacitor negative terminal (negative pump) |
| Broche 6 | V- — Charge-pump generated -2×VCC supply for driver output stages (~-9V) |
| Broche 7 | T2OUT — RS-232 Driver 2 output |
| Broche 8 | R2IN — RS-232 Receiver 2 input |
| Broche 9 | R2OUT — TTL/CMOS Receiver 2 output |
| Broche 10 | T2IN — TTL/CMOS Driver 2 input |
| Broche 11 | T1IN — TTL/CMOS Driver 1 input |
| Broche 12 | R1OUT — TTL/CMOS Receiver 1 output |
| Broche 13 | R1IN — RS-232 Receiver 1 input |
| Broche 14 | T1OUT — RS-232 Driver 1 output |
| Broche 15 | GND — Ground |
| Broche 16 | VCC — +4.5V to +5.5V supply input |
Applications typiques
MAX232CSE+T convient pour 6 applications: Microcontroller RS-232 Serial Port (UART to DB-9), Industrial RS-232 Control and Instrumentation, Point-of-Sale (POS) Terminal Serial Interfaces, Network Router and Switch Console Port, Legacy PC Peripheral Interface (Industrial PCs), Embedded Debug and Programming Interfaces.
Microcontroller RS-232 Serial Port (UART to DB-9)
The MAX232CSE+T is the de-facto level translator between a 3.3V or 5V microcontroller UART (TTL 0/3.3V or 0/5V CMOS) and an external DB-9 RS-232 port requiring bipolar ±5V minimum levels. Its integrated charge pump derives ±9V typical from a single +5V rail using four 1 µF capacitors, eliminating the need for a separate DC-DC converter or dual-rail supply. With 120 kb/s data rate and 5 kΩ receiver pull-down to ground, it pairs cleanly with STM32, PIC, AVR, and Arduino-class MCUs. Place the four charge-pump capacitors (typically X7R 1 µF 25V) as close to the C1+/C1-/C2+/V+/V- pins as possible to minimize supply ripple. ESD protection should be added externally on the DB-9 connector for industrial environments.
Recommandé
Industrial RS-232 Control and Instrumentation
Factory-floor PLCs, motor drives, and serial-controlled instrumentation commonly require EIA/TIA-232E links to legacy controllers. The MAX232CSE+T's commercial 0 °C to +70 °C temperature range (or the MAX232E extended -40 °C to +85 °C variant) suits indoor industrial enclosures and panel-mount serial ports. Its true RS-232 compliant ±7.5V minimum driver output into a 3 kΩ load ensures interoperability with downstream equipment. Two drivers and two receivers are sufficient for TX/RX plus hardware-flow-control RTS/CTS handshake lines. Typical schematics use a T1IN/R1OUT pair wired to the MCU UART and a T2IN/R2OUT pair wired to MCU GPIO for RTS/CTS. The 16-SOIC narrow-body package fits easily inside IP65-rated enclosure housings.
Recommandé
Point-of-Sale (POS) Terminal Serial Interfaces
POS terminals require RS-232 links to legacy peripherals such as receipt printers, barcode scanners, cash-drawer triggers, and customer-facing displays. The MAX232CSE+T supplies two RS-232 driver/receiver pairs enough for a printer port and a scanner port, with the integrated charge pump keeping the bill-of-materials lean - no extra ±12V supply, no inductors, only four 1 µF X7R ceramic capacitors. Its 120 kb/s data rate comfortably handles serial printer and scanner data streams. The SOIC-N-16 footprint is easy to route on the dense POS main board and the part's +5V supply aligns with typical POS platform rails.
Recommandé
Network Router and Switch Console Port
Enterprise routers, switches, and access points include an RJ-45 console port wired through a TTL-to-RS-232 transceiver for out-of-band management. The MAX232CSE+T is widely used in this role because it operates from the board's +5V rail and provides ±7.5V RS-232 levels directly with only four 1 µF caps. The console-port MPD (modem) signals DTR, DSR, TX, RX, RTS, and CTS can all be supported with the two drivers and two receivers plus a few discrete inversions. Pin-compatibility with the SP232ACN-L/TR (MaxLinear) gives design teams a second-source option to manage supply-chain risk in long-lifecycle networking hardware.
Recommandé
Legacy PC Peripheral Interface (Industrial PCs)
Industrial PCs, test-and-measurement instruments, and laboratory data-acquisition systems often retain RS-232 COM ports for compatibility with older peripherals and lab equipment. The MAX232CSE+T is the canonical transceiver on the COM-port side of the motherboard, interfacing the Super-I/O chip's UART (TTL) to the DB-9 connector (RS-232 levels). Its small 16-SOIC narrow-body footprint, single +5V operation, and proven interoperability with virtually all PC software make it a standard choice. Receive path robustness (±30 V receiver input range) protects against mis-wired cabling in field service situations.
Recommandé
Embedded Debug and Programming Interfaces
Development boards, ISP programmers, and in-circuit debuggers expose a TTL-level UART header that is often converted to a PC-facing RS-232 port via the MAX232CSE+T. Using it on a debugger/programmer board provides a debug output that any PC terminal program can read without extra USB-serial dongles. With two drivers and two receivers it can also handle bootloader TX/RX plus a hardware reset handshake. Its wide 4.5V to 5.5V supply range accommodates 5V-tolerant microcontroller debug pins, and the part's proven track record across thousands of evaluation boards makes it a low-risk reference design choice.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX232CSE+T — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX232CSE+ | MAX232EESE+T | MAX232CWE+T | SP232ACN-L/TR | MAX3232CSE+T |
|---|---|---|---|---|---|---|
| Package | 16-SOIC narrow (SOIC-N-16) | 16-SOIC narrow (same) | 16-SOIC narrow (same) | 16-SOIC wide (NOT pin-to-pin) | 16-SOIC narrow (same) | 16-SOIC narrow (same) |
| Brand | Analog Devices (Maxim Integrated) | Analog Devices | Analog Devices | Analog Devices | MaxLinear (Sipex) | Analog Devices |
| Supply Voltage | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 4.5V to 5.5V | 3.0V to 5.5V (wider) |
| Data Rate | 120 kb/s | 120 kb/s | 200 kb/s | 200 kb/s | 120 kb/s | 120 kb/s (250 kb/s for E variant) |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C |
| Drivers / Receivers | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 | 2 / 2 |
| Charge-Pump Caps | 4 × 1 µF | 4 × 1 µF | 4 × 1 µF | 4 × 1 µF | 4 × 1 µF | 4 × 0.1 µF (smaller) |
Principaux différenciateurs
- Single +5V supply with integrated charge pump (vs MAX3232CSE+T)
- Cross-brand second source (SP232ACN-L/TR) (vs MAX232CSE+ only (single-vendor))
- Wide distributor availability with single +5V supply (vs MAX232EESE+T)
Notes de conception
Place the four charge-pump flying and reservoir capacitors (C1, C2 flying, C3+, C4-) as close as possible to the C1+, C1-, C2+, C2-, V+, and V- pins of the MAX232CSE+T. Use short, wide traces to minimize the high-frequency charge-pump current loop. Estimated: with 4 × 1 µF X7R ceramic capacitors on a properly designed ground plane, charge-pump output ripple is typically under 50 mV pk-pk. Add a 0.1 µF decoupling capacitor right at pin 16 (VCC) and a 1 µF bulk cap within 5 mm of the VCC pin for clean driver output levels.
Do NOT substitute 1 µF capacitors with 0.1 µF parts on the MAX232CSE+T - this part requires 1 µF minimum for proper charge-pump operation. Using smaller capacitors will cause insufficient driver output voltage (below the ±5V RS-232 spec) and potentially violate the EIA/TIA-232E driver output requirement of ±5V minimum into 3 kΩ loads. If you need 0.1 µF capacitors, switch to the MAX3232CSE+T family instead - it is pin-compatible but optimized for 0.1 µF charge-pump caps and supports 3.0V to 5.5V supply.
Keep the RS-232 driver output traces (T1OUT, T2OUT) away from sensitive analog or RF traces - the charge-pump switching at frequencies above the audio band (~100 kHz to 1 MHz) can radiate onto nearby signal traces. Use a ground plane under the MAX232CSE+T to provide a low-impedance return path for the high-frequency charge-pump currents. For ESD-sensitive applications, add external TVS diodes (such as PESD5V0L1BA or similar) on each RS-232 line near the DB-9 connector, since the MAX232CSE+T internal ESD protection is limited.
For cable lengths above 3 meters at 120 kb/s, consider adding series resistors (~10 Ω) in the T1OUT/T2OUT lines to dampen reflections on capacitive cables. Estimated: a typical DB-9 cable has 50 to 100 pF per meter of distributed capacitance; a 10 Ω series resistor with a 100 pF/m × 3 m = 300 pF cable gives a damping factor that reduces ringing on transitions. For long cables or noisy environments, also add a small RC filter (100 Ω + 100 pF) at the receiver input to filter HF noise.
Informations de conformité
RoHS and REACH compliant per +T suffix in MPN (lead-free, matte-tin lead finish). Halogen-free per JEDEC JS709B. Not AEC-Q100 qualified (commercial grade only) - choose MAX232EESE+T or MAX232AEUE+ for automotive/extended-temperature applications.
