ADM239LAN - 5V 3/5 RS-232 Transceiver | Analog Devices
Référence : ADM239LAN ✓ ActifADM239LAN Présentation
An RS-232 transceiver is an interface IC that translates between complementary logic-level signals and the voltage levels defined by the EIA-232 standard. A transmitter converts logic data into RS-232 line signals, while a receiver converts incoming line signals back into CMOS-compatible data. In the broader semiconductor hierarchy, the ADM239LAN is a line driver and receiver, then an interface transceiver, and ultimately an interface IC. Its three transmitters permit three outgoing data channels, while its five receivers provide five incoming channels.
The principal features of the ADM239LAN are its single 5 V supply operation, 120 kB/s data rate, integrated DC-DC conversion, approximately 9 V output swing, low-power shutdown capability, and receiver operation during shutdown. The integrated DC-DC converter eliminates the need for a separate external RS-232 charge-pump supply in applications where the 5 V system rail is already available. The shutdown function can reduce consumption when the interface is not actively communicating.
The verified manufacturer-related search information identifies the ADM239LAN as a 5 V powered CMOS RS-232 driver and receiver device and confirms the 3/5 channel arrangement through the available comparison result. The listed package is 24-pin PDIP, which provides a through-hole footprint with widely spaced leads for easier inspection and assembly. Detailed pin names, receiver input thresholds, supply-current limits, and operating-temperature limits were not included in the supplied verification data and therefore are not inferred here.
Typical uses include multiport industrial controller connections, laboratory instrument control, point-of-sale equipment, and embedded systems that need several RS-232 channels sharing one logic-level supply. The integrated DC-DC approach is particularly useful where board space is constrained. System designers should still account for the higher line-side voltage, maintain appropriate RS-232 grounding, and verify transient protection for cables connected to external equipment.
This page combines the verified ADM239LAN specifications, package information, purchasing-source links, interface application guidance, and a conservative drop-in replacement assessment. It distinguishes electrically similar family members from alternatives that require a different package or an engineering review, helping engineers avoid assuming that a similar RS-232 device is pin-compatible.
Alternatives de remplacement direct pour ADM239LAN — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
ADM239LANZ
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
ADM239LAN Spécifications
| Product Type | RS-232 transceiver |
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| Tension d'alimentation | 5 V |
| Maximum Data Rate | 120 kB/s |
| RS-232 Compliance | EIA-232-E and V.28 |
| DC-DC Converter | On-board |
| Driver Output Swing | 9 V |
| Power Shutdown | Supported |
| Receiver Operation During Shutdown | Active |
| Receiver Input Voltage Rating | 30 V |
| Boîtier | 24-pin PDIP |
| Type de montage | Through-hole |
| Technology | CMOS |
Guide de configuration des broches du ADM239LAN 24-pin pdip
Configuration des broches du ADM239LAN (boîtier 24-pin pdip). 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 ADM239LAN.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
ADM239LAN convient pour 6 applications: Industrial Controller Interfaces, Laboratory Data Acquisition, Point-of-Sale and Retail Terminals, Service and Diagnostic Equipment, Embedded Legacy Communication Systems, Instrument and Meter Communication.
Industrial Controller Interfaces
The ADM239LAN fits industrial controller equipment that must communicate with several legacy RS-232 peripherals while operating from a single 5 V rail. Its three drivers and five receivers provide eight total line-circuit channels in one 24-pin PDIP device, reducing the number of separate interface ICs required. The verified 120 kB/s maximum data rate is suitable for conventional supervisory, configuration, and status protocols rather than high-speed data streaming. The integrated DC-DC converter generates the specified 9 V output swing from the 5 V supply, which can simplify board planning compared with adding an external charge-pump circuit. Designers should follow the manufacturer-recommended capacitor values and account for ESD protection on externally connected RS-232 lines.
Recommandé
Laboratory Data Acquisition
The ADM239LAN is useful in laboratory instruments that must receive commands or measurements from multiple RS-232 devices and return responses on separate channels. Five receiver channels reduce the number of external interface components needed for multi-instrument benches, while three drivers support separate response paths. Its documented 120 kB/s rate is appropriate for command traffic, status reporting, and legacy instrument protocols. The single 5 V operating supply also aligns with many acquisition systems that already distribute a 5 V logic rail. Because laboratory RS-232 cables can be long and connect to user-accessible equipment, the board should include suitable transient protection and a clear signal-ground strategy. The 24-pin PDIP footprint favors repairable or through-hole laboratory hardware.
Recommandé
Point-of-Sale and Retail Terminals
Retail terminals and point-of-sale peripherals often retain RS-232 connections for printers, scanners, customer displays, and service equipment. The ADM239LAN provides three transmit channels and five receive channels, allowing a compact terminal controller to consolidate several connections around one 5 V interface IC. Its 120 kB/s data rate is more than sufficient for common peripheral commands and transaction data, while the integrated DC-DC converter avoids a separate elevated RS-232 supply stage. The 24-pin PDIP package can simplify assembly in equipment that uses through-hole boards. A production design should nevertheless verify enclosure grounding, cable routing, and electrostatic-discharge protection because RS-232 connectors are often accessible to operators and connected to variable-length cables.
Recommandé
Service and Diagnostic Equipment
The ADM239LAN fits service consoles and diagnostic systems that must test several RS-232-enabled boards or modules. Three driver channels can issue commands or test patterns, while five receiver channels can collect responses simultaneously, reducing connection count and software complexity. The verified EIA-232-E and V.28 compliance and 120 kB/s rate align with conventional diagnostic protocols. Operation from one 5 V rail is convenient for embedded service equipment, and the integrated DC-DC converter supplies the stated 9 V output swing. The through-hole PDIP package can be useful where boards are assembled for maintainability rather than minimum size. Designers should add surge or ESD protection where test leads leave the enclosure and confirm that unused outputs are handled according to the datasheet.
Recommandé
Embedded Legacy Communication Systems
Embedded controllers often need to coexist with older RS-232 equipment while using modern 5 V logic internally. The ADM239LAN consolidates three outbound and five inbound RS-232 channels into one interface IC, which is useful when the available PCB area is constrained. Its CMOS implementation, 120 kB/s maximum rate, and on-board DC-DC conversion make it suitable for command-oriented links to legacy peripherals. The 24-pin PDIP package is less compact than a surface-mount alternative, but it can improve hand assembly and repairability in low-volume embedded products. Firmware designers should define clear channel mapping and shutdown behavior, while hardware engineers should confirm the pin assignments, bypass capacitors, and signal-ground connection directly against the manufacturer datasheet before layout release.
Recommandé
Instrument and Meter Communication
The ADM239LAN can support instruments and meters that exchange command, status, and configuration data with a host computer or controller. Multiple receivers allow the instrument to monitor several incoming channels, while three transmitters support responses or control lines to separate devices. The verified 120 kB/s data rate is appropriate for typical meter protocols, and the integrated DC-DC converter produces a 9 V RS-232 output swing from one 5 V supply. This can reduce external power-conversion complexity in portable or bench instruments. The through-hole package is practical for modular meter hardware assembled by contract manufacturers. Before layout, verify the manufacturer's recommended charge-pump capacitor arrangement and ensure the logic and signal grounds meet applicable EMI and ESD requirements for the enclosure and cable environment.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour ADM239LAN — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | ADM239LANZ |
|---|---|---|
| Package | 24-pin PDIP | 24-pin PDIP |
| Brand | Analog Devices | Analog Devices |
| Product Type | RS-232 transceiver | RS-232 transceiver |
| Number of Drivers | 3 | 3 |
| Number of Receivers | 5 | 5 |
| Supply Voltage | 5 V | 5 V |
| Maximum Data Rate | 120 kB/s | 120 kB/s |
| DC-DC Converter | On-board | On-board |
| Output Swing | 9 V | 9 V |
Principaux différenciateurs
- Eight combined RS-232 line channels in one interface IC (vs MAX232DR)
- Integrated elevated-voltage generation (vs ADM239LANZ)
- Verified multi-channel throughput capability (vs ADM238LAN)
Notes de conception
Use the manufacturer-recommended input bypass and charge-pump capacitor arrangement around the ADM239LAN. The integrated DC-DC converter creates the stated 9 V RS-232 output swing from the 5 V supply, but incorrect capacitor values or placement can impair output swing, noise, and data reliability. Confirm the exact capacitor values and layout from the current Analog Devices datasheet before fabrication rather than relying on generic RS-232 charge-pump values.
Do not classify a device as a drop-in replacement solely because it has three drivers, five receivers, and a 24-pin PDIP package. The verified ADM239LANZ result is a family candidate, but the source explicitly requires suffix, pinout, and package verification. Compare every pin, shutdown state, supply range, and timing specification before substitution, and obtain manufacturer approval for production use.
RS-232 uses line-side voltages above logic levels, so connect the interface ground deliberately and keep it consistent with the enclosure and cable shield strategy. Route the three driver outputs and five receiver inputs away from switching nodes and sensitive analog traces. Add external ESD or surge protection on user-accessible connectors, with the protection return path referenced to the appropriate board ground.
Informations de conformité
The supplied verified results do not explicitly state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status for the ADM239LAN. AEC-Q100 is not applicable because this is a general-purpose interface IC rather than an automotive-qualified device.