MAX232DRE4 - Dual RS-232 Transceiver, 120 kbit/s | TI
Référence : MAX232DRE4 ✓ ActifMAX232DRE4 Présentation
An RS-232 transceiver is an interface IC that converts low-voltage TTL or CMOS logic signals into balanced RS-232 voltage levels and converts incoming RS-232 signals back into logic levels. Within the interface hierarchy, the MAX232 belongs to the RS-232 transceiver family, providing physical-layer conversion for UART, serial-port, and point-to-point communication systems. It simplifies the interface by generating the positive and negative RS-232 voltages from one 5 V supply.
The MAX232DRE4 supports operation from 4.5 V to 5.5 V, data rates up to 120 kbit/s, and receiver input levels as high as ±30 V. Its typical supply current is 8 mA, while 500 mV receiver hysteresis improves noise immunity at the logic threshold. The commercial-temperature version operates from 0°C to 70°C and is available in a 16-SOIC package.
The device uses charge-pump capacitors to produce the bipolar voltage swings required by RS-232. Its two driver channels translate TTL outputs into RS-232 levels, while its two receiver channels perform the inverse conversion. This architecture suits point-to-point links where full-duplex communication and deterministic logic-level interfacing are required without adding a separate external power-supply circuit.
Typical uses include RS-232 ports on industrial controllers, laboratory instruments, barcode readers, data-acquisition equipment, service interfaces, and embedded systems that retain a legacy serial connector. The 120 kbit/s maximum rate provides ample margin for configuration consoles, control commands, firmware downloads, and low-to-moderate-rate telemetry.
PCB design should prioritize short connections between the charge-pump capacitors, supply pins, and device ground. Place the required 1.0 µF capacitors close to their associated pins, use a solid ground plane, and keep the RS-232 connector interface area physically separated from sensitive analog circuitry to reduce ESD and surge-related coupling.
This page combines electrical specifications, package and application guidance, practical layout considerations, and a structured comparison with verified same-family and cross-brand alternatives. It is intended to help engineers evaluate MAX232DRE4 for a new RS-232 design or determine whether an existing 16-SOIC board can be supported by a pin-compatible replacement.
Alternatives de remplacement direct pour MAX232DRE4 — 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 MAX232DRE4 (même facteur de forme et même empreinte) — différant par Package, Mounting Type, ESD Protection, Operating Temperature Range, Product Type.
MAX232EIDR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232IN
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MAX232ECSE
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
MAX232ECDR
✅ Remplacement directContactez-nous pour le prix
Voir la fiche technique →MAX232DRE4 Spécifications
| Product Type | Dual RS-232 driver/receiver transceiver |
| Number of Drivers | 2 |
| Number of Receivers | 2 |
| Supply Voltage Range | 4.5 V to 5.5 V |
| Maximum Data Rate | 120 kbit/s |
| Plage de température de fonctionnement | 0°C to 70°C |
| Receiver Hysteresis | 500 mV |
| Maximum Receiver Input Voltage | ±30 V |
| Charge-Pump Capacitor Value | 1.0 µF |
| Typical Supply Current | 8 mA |
| ESD Protection | Exceeds JESD22-A200 2 kV human-body-model voltage |
| Boîtier | 16-SOIC, 3.90 mm body width |
| Type de montage | Surface mount |
| Temperature Grade | Commercial |
| Statut RoHS | ROHS3 compliant |
| Logic Compatibility | TTL/CMOS |
Guide de configuration des broches du MAX232DRE4 16-soic, 3.90 mm body width
Configuration des broches du MAX232DRE4 (boîtier 16-soic, 3.90 mm body width). La numérotation des broches, les fonctions et les schémas de connexion sont définis dans la fiche technique du fabricant. Consultez-la pour l'empreinte exacte et les directives de soudage.
Aucune donnée de brochage détaillée disponible pour MAX232DRE4.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
MAX232DRE4 convient pour 6 applications: Industrial controller service ports, Laboratory instrumentation, Barcode readers and scanners, Data acquisition and test equipment, Embedded system maintenance interfaces, RS-232-to-TTL legacy adapters.
Industrial controller service ports
The MAX232DRE4 fits industrial controller service interfaces that need a reliable logic-to-RS-232 conversion stage. Its two drivers and two receivers support a full-duplex console or a second auxiliary channel, while the 4.5 V to 5.5 V operating range accommodates a regulated 5 V control system. The 120 kbit/s rate comfortably covers terminal sessions, configuration commands, diagnostics, and short firmware-transfer functions. Its 500 mV receiver hysteresis improves threshold noise immunity, which is useful when the serial cable enters a controller enclosure near switching circuitry.
Recommandé
Laboratory instrumentation
The MAX232DRE4 is appropriate for laboratory instruments that expose a legacy RS-232 configuration or data port. A single 5 V supply allows it to sit alongside TTL/CMOS control logic without a separate negative rail, and the internal charge pump produces the required RS-232 voltage swings. Two transmitters and two receivers provide channel flexibility for command and response paths. At a maximum rate of 120 kbit/s, the device supports instrument status, parameter setting, calibration data, and moderate-volume test-result transfer.
Recommandé
Barcode readers and scanners
The MAX232DRE4 can provide the physical-layer interface between a scanner or barcode reader and a host controller. Many legacy scanners transmit RS-232 data rather than USB or Ethernet, while the host logic operates at TTL/CMOS levels. The MAX232DRE4 converts those domains while supporting communication rates well above the throughput needed for ordinary scanned data. Its ±30 V receiver input capability also provides useful margin for conventional RS-232 port exposure, while receiver hysteresis helps reject noise near the logic threshold.
Recommandé
Data acquisition and test equipment
The MAX232DRE4 is suitable for data-acquisition and test systems that need to exchange commands or records with a legacy computer or controller. The 120 kbit/s limit is appropriate for supervisory data, configuration files, status messages, and sampled information that does not require continuous high-bandwidth streaming. Two receivers can monitor or receive data from additional sources, and two drivers can support separate outbound channels. Its commercial 0°C-to-70°C range makes it most appropriate for indoor equipment with controlled ambient conditions.
Recommandé
Embedded system maintenance interfaces
The MAX232DRE4 supports maintenance and diagnostic ports on embedded systems that retain an RS-232 connector for field configuration or troubleshooting. It requires only a regulated 5 V supply and the specified charge-pump capacitors, reducing the external power complexity relative to discrete RS-232 designs. The 16-SOIC package is compatible with conventional through-hole and mixed-assembly PCB methods. Its two transmitters and two receivers allow a full-duplex channel plus an additional path, and the 500 mV hysteresis improves reliability in electrically noisy equipment cabinets.
Recommandé
RS-232-to-TTL legacy adapters
The MAX232DRE4 is well suited to small RS-232-to-TTL adapters used with legacy microcontrollers, development systems, and service equipment. The controller presents ordinary logic levels to the MAX232, while the adapter exposes the corresponding RS-232 connector pins. Supporting 120 kbit/s allows use with common UART baud rates and avoids introducing unnecessary bandwidth limits. Designers should preserve the complete charge-pump capacitor network, provide a low-impedance ground connection, and keep the connector-side traces away from sensitive clock, reset, and analog-input nets.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour MAX232DRE4 — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Choose the MAX232EIDR instead when enhanced IEC61000-4-2 protection is more important than retaining the MAX232DRE4 ordering configuration, after confirming package dimensions and pin compatibility. Consider the MAX232IN for a related standard MAX232 implementation when its current lifecycle, temperature grade, and exact package better match the design. The MAX232ECSE is another same-family option, but its suffix-specific electrical and environmental details must be checked. The Analog Devices MAX232 provides a cross-brand second source with the same fundamental dual-driver, dual-receiver architecture. For every option, verify SOIC body width, lead pitch, pin numbering, temperature range, ESD rating, capacitor value, and production availability before treating it as a drop-in replacement.
Comparaison avec les alternatives
| Paramètre | Ce produit | MAX232EIDR | MAX232IN | MAX232ECSE | MAX232 |
|---|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices |
| Package | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC | 16-SOIC |
| Transceiver Configuration | 2 drivers and 2 receivers | 2 drivers and 2 receivers | 2 drivers and 2 receivers | 2 drivers and 2 receivers | 2 drivers and 2 receivers |
Principaux différenciateurs
- Specific commercial-temperature ordering configuration (vs MAX232IN)
- Standard MAX232 function with a straightforward 120 kbit/s interface (vs MAX232EIDR)
- Broad receiver input tolerance (vs MAX232ECSE)
Notes de conception
Place the specified 1.0 µF charge-pump capacitors directly between their designated capacitor pins and the corresponding ground or supply references. Keep these loops short because the charge pump produces high-frequency switching current. Follow the Texas Instruments datasheet layout and capacitor guidance rather than routing the capacitor connections around the package. This minimizes radiated noise and reduces the chance that switching activity will disturb adjacent UART receivers or sensitive analog circuitry.
Separate the connector-side RS-232 nets from TTL/CMOS signals, crystal circuits, reset traces, and analog inputs. Route driver outputs directly toward the connector and avoid sharing return paths with sensitive inputs. Provide a continuous ground reference between the IC, charge-pump capacitors, and connector shield. Keep the MAX232DRE4 away from high-current switching nodes and inductive components, because their fields can disturb the receiver threshold even when the logic-side waveform is clean.
Do not treat RS-232 and TTL as direct chip-to-chip connections. The MAX232DRE4 requires correct driver, receiver, supply, ground, and charge-pump connections; reversing a driver output with a receiver input can damage the device. Also verify whether the existing PCB uses a wide or narrow SOIC land pattern. A nominal 16-SOIC description alone is insufficient for a drop-in substitution, so compare body width, lead pitch, pin numbering, and datasheet dimensions before assembly.
The internal charge-pump switching action can couple into nearby circuits. Use a low-impedance ground plane, add normal supply decoupling close to the 5 V and ground pins, and avoid extending unprotected logic traces beneath the IC or charge-pump capacitor network. If the RS-232 port is externally accessible, place protection and chassis-ground provisions near the connector. Keep the protection path away from the receiver input so surge current is not forced through logic traces.
Informations de conformité
The MAX232DRE4 is identified as ROHS3 compliant. The commercial 16-SOIC interface IC is not identified as an automotive-qualified AEC-Q100 product. REACH, lead-free, halogen-free, and conflict-minerals declarations require confirmation from the manufacturer for the exact ordering configuration.
