MAX232ECD - 5V Dual RS-232 Driver/Receiver | Texas Instruments
Référence : MAX232ECD ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 1 | $1.42 | $1,42 |
| 10 | $1.18 | $11,80 |
| 100 | $0.92 | $92,00 |
| 500 | $0.78 | $390,00 |
| 1 000 | $0.65 | $650,00 |
MAX232ECD Présentation
An RS-232 line driver/receiver (also called a transceiver) is a type of interface IC that bridges the voltage gap between TTL/CMOS logic (0V-5V) and the TIA/EIA-232-F standard (±5V to ±15V swing). It belongs to the broader hierarchy of line drivers -> interface ICs -> integrated circuits -> semiconductors. The MAX232 family is the de-facto industry-standard solution for asynchronous serial-port level translation and is found in nearly every embedded design that needs RS-232 connectivity.
Key features include integrated IEC61000-4-2 ESD protection (typically ±15kV air-gap, ±8kV contact discharge on the RS-232 pins), low supply current of typically 8 mA with no load, and 1.0 µF charge-pump capacitors (versus the original MAX232 which used 1.0 µF; the MAX232E and MAX232EC variants retain the same capacitor requirement). The 'C' suffix indicates the commercial 0°C to +70°C operating temperature range. The wide ±30V receiver input range tolerates mis-wired or shorted RS-232 cables without permanent damage.
The MAX232ECD uses a charge-pump architecture based on a switched-capacitor voltage doubler and voltage inverter. An internal oscillator (typically 125 kHz) drives the charge pump; the doubled +10V (V+) and inverted -10V (V-) rails feed the driver output stage, while the receiver section operates from the single 5V supply with internal 5 kΩ pull-down resistors. This architecture eliminates the bulky ±12V supplies historically required for RS-232 interfaces.
Typical applications include industrial PLC serial ports, point-of-sale (POS) terminals, embedded microcontroller debug consoles, legacy PC COM-port replacements via USB-to-serial bridges, and any design requiring TIA/EIA-232-F compliance. The integrated IEC61000-4-2 ESD protection makes the MAX232ECD especially suitable for cables exposed to user contact or industrial ESD events.
When designing with this device, place the four charge-pump capacitors (typically 1.0 µF ceramic) as close to the C1+, C1-, C2+, C2- pins as possible. Although the integrated ESD protection is robust, external TVS diodes are still recommended for the most demanding industrial environments. The MAX232ECD is pin-compatible with the industry-standard MAX232 and may be used as a drop-in upgrade in most existing designs.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet alone - including a parametric comparison versus the MAX3232E, ADM232, and HIN232 families and verified IEC61000-4-2 ESD ratings not always quoted in the datasheet's electrical characteristics table.
Alternatives de remplacement direct pour MAX232ECD — 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 MAX232ECD (même facteur de forme et même empreinte) — différant par Package, Data Rate, ESD Protection (IEC 61000-4-2), Function, Operating Temperature.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
MAX232ECDG4
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232ECDR
✅ Remplacement direct✓ En stock
$0.82 / unité
Voir la fiche technique →MAX232EID
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MAX202ECDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX3232ECDB
✅ Remplacement direct✓ En stock
$1.49 / unité
Voir la fiche technique →MAX232ECWE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232EESE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
HIN232ECP
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
MAX232ECD Spécifications
| Fonction | Dual RS-232 Driver/Receiver (Transceiver) |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Data Rate (max) | 120 kbit/s |
| Tension d'alimentation | 4.5 V to 5.5 V (single 5 V supply) |
| RS-232 Output Voltage Swing | ±5 V to ±10 V (from charge pump) |
| Receiver Input Voltage Range | ±30 V |
| ESD Protection (RS-232 pins) | IEC61000-4-2: ±15 kV air, ±8 kV contact |
| Supply Current (no load, typ) | 8 mA typical |
| Charge-Pump Capacitors | 4 x 1.0 µF external |
| Température de fonctionnement | 0 °C to +70 °C (commercial, C suffix) |
| Boîtier | 16-pin SOIC (D) |
| Type de montage | Surface Mount |
| Statut RoHS | Compliant |
| Lead-Free | Yes |
Configuration des broches de MAX232ECD
| Broche 1 | C1+ — Charge-pump flying capacitor 1, positive terminal |
| Broche 2 | V+ — Charge-pump regulated +10 V output (RS-232 driver supply) |
| Broche 3 | C1- — Charge-pump flying capacitor 1, negative terminal |
| Broche 4 | C2+ — Charge-pump flying capacitor 2, positive terminal |
| Broche 5 | C2- — Charge-pump flying capacitor 2, negative terminal |
| Broche 6 | V- — Charge-pump regulated -10 V output (RS-232 driver supply) |
| Broche 7 | T2OUT — RS-232 driver 2 output |
| Broche 8 | R2IN — RS-232 receiver 2 input (±30 V tolerant) |
| 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 (±30 V tolerant) |
| Broche 14 | T1OUT — RS-232 driver 1 output |
| Broche 15 | GND — Ground |
| Broche 16 | VCC — 5 V supply input (4.5 V to 5.5 V) |
Applications typiques
MAX232ECD convient pour 6 applications: Industrial PLC Serial Port Interface, Embedded Microcontroller Debug Console, Point-of-Sale (POS) Terminal Connectivity, USB-to-Serial Bridge Adapter, Legacy PC COM-Port Replacement, Medical Instrument Data Logger.
Industrial PLC Serial Port Interface
The MAX232ECD is the de-facto RS-232 transceiver for industrial PLC and HMI serial ports, converting 5V TTL UART signals from the microcontroller to TIA/EIA-232-F ±10V levels on the DB-9 connector. The integrated ±15 kV IEC61000-4-2 ESD protection (air gap) on the RS-232 pins directly absorbs cable-discharge events when operators plug cables into the front-panel port, eliminating the need for an external TVS diode array on most field installations. The 120 kbit/s data rate covers Modbus RTU and most legacy industrial protocols. Designers place four 1.0 µF ceramic capacitors on C1+/C1-/C2+/C2- within 5 mm of the IC pins and route the RS-232 traces with 100 Ω differential impedance for EMI control.
Recommandé
Embedded Microcontroller Debug Console
Embedded designs based on 5V microcontrollers (PIC, AVR, 8051, MSP430) use the MAX232ECD to provide a TIA/EIA-232-F level-shifted UART debug console on a 9-pin D-sub connector or 3.5 mm stereo jack. The single 5V supply operation simplifies the power tree - the same rail that powers the MCU also drives the MAX232ECD's internal charge pump, generating the required ±10V RS-232 levels without a negative bias supply. The 16-pin SOIC package fits hand-soldered prototype boards and the part is widely second-sourced, ensuring long-term availability for production. Use 1.0 µF X7R ceramic capacitors for the charge pump and a 100 nF decoupling capacitor directly on VCC.
Recommandé
Point-of-Sale (POS) Terminal Connectivity
POS terminals, cash drawers, receipt printers, and barcode scanners typically interface via RS-232 to legacy back-office equipment. The MAX232ECD's integrated ±15 kV ESD protection directly handles the human-discharge events common at retail checkouts - customers and operators frequently touch connected cables and connectors. The device's 120 kbit/s throughput is more than adequate for typical 9600-115200 baud terminal traffic, and the commercial 0°C to +70°C operating range covers all indoor retail environments. The wide ±30V receiver input range tolerates shorted or mis-wired cables without permanent damage, an important consideration in retail deployments where cables are frequently swapped.
Recommandé
USB-to-Serial Bridge Adapter
USB-to-RS-232 adapter cables (using FTDI FT232R, Silicon Labs CP2102N, or CH340) require a MAX232ECD-style level translator to convert the bridge IC's 5V UART output to RS-232 ±10V levels. In these compact dongle designs, the MAX232ECD's small SOIC-16 footprint and low 8 mA typical supply current minimize PCB size and USB bus load. The integrated IEC61000-4-2 ESD protection eliminates the need for external TVS diodes, reducing BOM cost and component count - critical for sub-$10 adapter cables. The 120 kbit/s speed supports all standard serial port baud rates up to 115200 with margin.
Recommandé
Legacy PC COM-Port Replacement
Industrial PCs and specialized single-board computers that retain DB-9 COM ports for compatibility with older peripherals use the MAX232ECD as the level translator between the motherboard's 5V UART and the RS-232 connector. The part's long-term second-source availability (originally Maxim, now TI and multiple vendors) makes it ideal for industrial products requiring 10-15 year lifecycle support. The commercial 0°C to +70°C operating range covers most indoor industrial PC deployments. Designers often place the MAX232ECD near the DB-9 connector to minimize trace length and maximize ESD performance.
Recommandé
Medical Instrument Data Logger
Medical instruments such as blood-pressure monitors, glucose meters, and patient monitors often expose a service-mode RS-232 port for calibration, firmware updates, and data export. The MAX232ECD's commercial 0°C to +70°C operating range and integrated IEC61000-4-2 ESD protection suit these hospital and clinical environments, where cables are frequently connected to laptops on carts. The 120 kbit/s data rate is sufficient for firmware update streaming and patient data export. The 16-pin SOIC package allows compact PCB integration into handheld devices. For FDA/IEC 60601-1 compliant designs, additional isolation (e.g., ADuM1411 digital isolator) should be placed between the MAX232ECD and the patient-connected circuitry.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX232ECD — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX232ECWE | MAX232EESE | MAX232EID | MAX3232ECD |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Analog Devices / Maxim Integrated | Analog Devices / Maxim Integrated | Texas Instruments | Texas Instruments |
| Package | 16-pin SOIC (D) | 16-pin SOIC Wide (W) - same footprint family | 16-pin SOIC Narrow (NS) - same footprint family | 16-pin SOIC (D) - same | 16-pin SOIC (D) - same |
| Supply Voltage | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 4.5 V to 5.5 V | 3.0 V to 3.6 V (3.3 V logic) |
| Max Data Rate | 120 kbit/s | 120 kbit/s | 120 kbit/s | 120 kbit/s | 250 kbit/s |
| ESD Protection (IEC61000-4-2) | ±15 kV air, ±8 kV contact | ±15 kV air, ±8 kV contact | ±15 kV air, ±8 kV contact | ±15 kV air, ±8 kV contact | ±15 kV air (HBM); lower contact rating |
| Operating Temperature | 0 °C to +70 °C (Commercial) | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C (Industrial) | 0 °C to +70 °C |
| Charge-Pump Capacitors | 4 x 1.0 µF | 4 x 1.0 µF | 4 x 1.0 µF | 4 x 1.0 µF | 4 x 0.1 µF |
| RoHS Compliance | Yes (lead-free) | Yes | Yes | Yes | Yes |
Principaux différenciateurs
- Integrated IEC61000-4-2 ESD protection on RS-232 pins (vs MAX232 (original, no ESD))
- Same SOIC-16 footprint as MAX232 for drop-in upgrades (vs MAX232 (original))
- Wide ±30V receiver input tolerance (vs MAX3232 (3.3V variant))
Notes de conception
Place four 1.0 µF X7R ceramic capacitors as close as possible to the C1+, C1-, C2+, C2- pins (within 5 mm). Use a low-ESR ceramic such as Murata GRM188R71A105K or equivalent. Add a 100 nF decoupling capacitor directly on the VCC pin (pin 16) with a short trace to GND (pin 15). The charge pump draws brief current pulses of ~30 mA at the oscillator frequency (~125 kHz), so a wide power-supply trace is recommended to avoid noise coupling into analog circuits.
Do not confuse the MAX232ECD (1.0 µF caps, with IEC ESD) with the MAX202 (100 nF caps, no IEC ESD) - although both share the same SOIC-16 pinout, swapping them on an existing PCB will result in either insufficient RS-232 output swing (if you use a MAX202 layout with 100 nF caps with a MAX232ECD - this works) or failure to boot (if you use a MAX232ECD layout with 1.0 µF caps with a MAX202 - the MAX202 cannot drive 1.0 µF stable). Always verify the cap value against the target part's datasheet before PCB respins.
Route the T1OUT/T2OUT (RS-232 driver outputs) and R1IN/R2IN (RS-232 receiver inputs) traces away from the T1IN/T2IN/R1OUT/R2OUT (logic-side) traces to minimize capacitive coupling. For cables longer than 2 meters, add a 100 Ω resistor in series with each T1OUT/T2OUT pin to dampen reflections and reduce radiated EMI. Place an external TVS diode array (such as PESD5V0L4UG) near the DB-9 connector for additional IEC61000-4-2 protection margin in harsh industrial environments.
The MAX232ECD's RS-232 driver output slew rate is limited by the charge-pump impedance and the load capacitance; data rates above 120 kbit/s will show reduced output amplitude and may fail to meet the TIA/EIA-232-F ±5V minimum swing specification with 2500 pF + 3 kΩ load. For higher baud rates or longer cables, use the MAX3232ECD (250 kbit/s, 3.3V supply) or HIN232 (120 kbit/s with stronger output drive) instead. Always verify your worst-case cable capacitance (typically 100 pF/m for RS-232 cable) stays within the part's rated load.
Informations de conformité
RoHS compliant and lead-free per TI product page. IEC61000-4-2 ESD protection (±15 kV air, ±8 kV contact) is integrated on RS-232 pins. TIA/EIA-232-F and ITU V.28 compliant. Not AEC-Q100 qualified - for automotive RS-232, use MAX3232EIDRQ1 or similar.
