LM2893N - Carrier-Current Transceiver | National Semiconductor
Référence : LM2893N ✓ ActifLM2893N Présentation
A carrier-current transceiver is a type of power-line interface IC. Carrier-current communication belongs to the broader power-line networking and interface IC hierarchy, where communication signals are superimposed on an electrical power conductor. The LM2893N is intended to interface a serial data source with a carrier-current network, making it useful where the mains wiring already extends between remote nodes and adding a separate low-speed communication route would be impractical.
The verified source information identifies the LM2893N as a one-transceiver, 20-PDIP device for carrier-current systems. Its principal benefit is integration: both directions of the half-duplex link are handled by a single package instead of separate transmitter and receiver packages. The confirmed communication mode is bidirectional and serial, allowing a node to exchange bit-stream data with another node over the same carrier-current medium.
The LM2893N belongs to the bipolar LM1893/LM2893 carrier-current transceiver family. This family positioning indicates that the LM2893 is the higher-temperature-oriented member relative to the LM1893 designation, although exact electrical limits and comparison values are not included in the supplied distributor data. Designers should use the manufacturer datasheet for voltage ratings, current limits, logic thresholds, transmission timing, receiver sensitivity, and network-interface details before releasing production hardware.
Typical carrier-current uses include remote metering, building-management communication, industrial monitoring, appliance control, and low-speed supervisory links where power and data share the same wiring. In these systems, the LM2893N acts as the physical-layer interface between the communication network and the node's serial logic. Network loading, isolation requirements, coupling method, transmit power, and protocol timing remain application-specific.
The principal design consideration is that carrier-current communication is materially different from ordinary RS-485 or isolated digital communication. The power conductor presents a difficult noise environment, and the interface network must be characterized for attenuation, impedance, coupling, and surge exposure. PCB grounding, filtering, isolation boundaries, and protection components therefore deserve attention before the communication protocol is finalized.
This product page combines verified distributor identification, family-level technical context, package information, sourcing links, and structured engineering guidance that is not available in a basic distributor listing. Exact electrical specifications and qualified drop-in replacements remain explicitly separated from verified facts so engineers can make a safe replacement decision without relying on assumptions.
Alternatives de remplacement direct pour LM2893N — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
LM1893N
✅ Remplacement direct ⚠️ Spécifications non vérifiées📋 Alternative de référence (hors catalogue)
LM2893N Spécifications
| Product Type | Carrier-current transceiver |
| Transceiver Configuration | 1/1 transceiver |
| Communication Mode | Half-duplex, bidirectional |
| Data Format | Serial bit stream |
| Transmission Medium | Power-mains carrier-current network |
| Boîtier | 20-PDIP |
| Nombre de broches | 20 pins |
| Type de montage | Through-hole |
| Integrated Functions | Transmitter and receiver in one package |
| IC Technology | Bipolar |
| Product Family | LM1893/LM2893 |
Guide de configuration des broches du LM2893N 20-pdip
Configuration des broches du LM2893N (boîtier 20-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 LM2893N.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
LM2893N convient pour 6 applications: Remote Utility Metering, Building Automation Networks, Industrial Sensor Monitoring, Smart Appliance Control, Remote Environmental Monitoring, Power-Line Communication Interface.
Remote Utility Metering
The LM2893N fits remote utility-metering nodes that must exchange serial bit streams over an existing power-main conductor rather than install a separate communications cable. Its confirmed one-transceiver arrangement supports half-duplex, bidirectional communication in a compact 20-PDIP package. The carrier-current interface is intended to superimpose data onto the mains network, while the application processor handles metering, storage, and protocol functions. Because the supplied excerpts do not specify supply voltage, data rate, sensitivity, or drive current, the engineer must validate those values against the network impedance, wiring length, and safety boundary. Filtering and surge protection should be designed around the actual power-line environment rather than inferred from generic transceiver specifications.
Recommandé
Building Automation Networks
The LM2893N can support low-speed building-automation communication where lighting, HVAC, access, and energy-management nodes already share mains wiring. Half-duplex, bidirectional serial operation allows one carrier-current interface to exchange command and status information, while the integrated transmitter and receiver reduce the component count compared with separate implementations. The main engineering trade-off is that building wiring can present attenuation, nonlinear loading, switching noise, and inconsistent grounding. A successful design therefore treats the carrier-current network as an analog channel, evaluates coupling and filtering, and checks the LM2893N datasheet for the exact logic thresholds, timing, and operating limits required by the selected building protocol.
Recommandé
Industrial Sensor Monitoring
The LM2893N is applicable to industrial sensor-monitoring installations where remote instruments communicate over an existing power line and adding a dedicated cable would be costly. Its confirmed half-duplex, bidirectional serial-bit-stream capability suits supervisory links that carry configuration commands and measurement status rather than continuous high-bandwidth traffic. Industrial sites can expose the interface to motors, contactors, variable-frequency drives, and long cable runs, so the designer must account for conducted noise and transient events. The interface network and filtering should be tested over the full cable length and load range, and the device's supply, drive, sensitivity, and temperature specifications must be confirmed from the manufacturer datasheet before deployment.
Recommandé
Smart Appliance Control
The LM2893N can serve as the carrier-current physical interface in appliances that need network control without a dedicated Ethernet or wireless subsystem. The verified one-transceiver configuration and bidirectional half-duplex operation allow a controller to exchange commands with a remote node over available mains wiring. This can simplify connectivity in equipment that already includes a power-line communication path, but it does not remove the need for protocol, isolation, and safety engineering. Product developers should define who owns the power-line network, characterize conducted emissions and immunity, and verify that logic levels and timing satisfy the appliance controller. The 20-PDIP package also requires accessible through-hole assembly and adequate spacing from high-voltage copper according to the applicable safety design rules.
Recommandé
Remote Environmental Monitoring
LM2893N can support remote environmental-monitoring stations that need a low-speed command and telemetry path over shared electrical infrastructure. Its serial, bidirectional, half-duplex interface is appropriate for periodic sensor reports, configuration downloads, status polling, and alarm messages. The principal benefit is extending connectivity through existing wiring rather than adding a radio link to every remote station. In outdoor or agricultural installations, however, long cables, temperature variation, moisture, and switching transients can materially affect carrier-current behavior. Design verification should therefore cover worst-case wiring, network loading, grounding arrangements, protection networks, and the device's documented operating-temperature range before the transceiver is selected for field deployment.
Recommandé
Power-Line Communication Interface
The LM2893N is the central physical-layer choice when a design explicitly requires carrier-current communication over a power conductor. Its integrated transmitter and receiver support one half-duplex link in a single 20-PDIP package, reducing board area compared with discrete transmitter and receiver implementations. The interface still needs carefully selected coupling, impedance-matching, filtering, and transient-protection components tailored to the network. Engineers should distinguish carrier-current communication from broadband PLC modem technology and verify the supported bit rate, logic levels, output drive, receiver threshold, and timing directly from the LM1893/LM2893 datasheet. Those unverified parameters are decisive when choosing between the LM2893N and a newer communications architecture.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour LM2893N — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | LM1893N |
|---|---|---|
| Package | 20-PDIP | 20-PDIP |
| Brand | National Semiconductor | National Semiconductor |
| Product Type | Carrier-current transceiver | Carrier-current transceiver |
Principaux différenciateurs
- Integrated one-transceiver implementation (vs LM1893N)
- Native carrier-current physical-layer support (vs MC3486N)
- Bidirectional communication in one standard through-hole package (vs MAX232DR)
Notes de conception
Treat the carrier-current interface as a high-noise analog network connection rather than an ordinary logic-level trace. Keep the transmitter, receiver, coupling components, and protection network arranged to minimize loop area and prevent high-current node activity from coupling directly into receiver input pins. Route the logic-side interface separately from mains-side conductors, maintain the clearances required by the product's mains classification, and verify the physical 20-pin PDIP pinout against the manufacturer drawing before releasing artwork because individual pin names were not present in the supplied excerpts.
Characterize the carrier-current network with the proposed wiring length, node count, loads, protective devices, and switching equipment present in the final installation. Filter both conducted emissions from the transmitter and unwanted incoming noise entering the receiver, then measure receiver output integrity during worst-case load transitions. Avoid choosing filter values from a generic carrier-current reference alone: network impedance, coupling topology, safety components, and the datasheet-defined drive and sensitivity limits all affect the final attenuation and bandwidth.
Do not substitute LM1893N, an RS-485 transceiver, or another carrier-current IC solely because the package has 20 pins. First confirm every pin function, supply rating, logic threshold, driver capability, receiver sensitivity, timing limit, temperature grade, and package drawing. The supplied evidence associates both LM1893N and LM2893N with the same transceiver family, but it does not provide the detailed values required to certify a drop-in substitution. Treat the listed alternative as a candidate for engineering review rather than an approved production replacement.
Power the LM2893N from a source that satisfies the manufacturer limits, but do not infer those limits from the bipolar-family description. Validate startup behavior, supply tolerance, current draw, and logic-level compatibility with the attached controller. If the transceiver is connected to a mains-powered node, separate the low-voltage supply from hazardous energy using an appropriate isolation boundary and comply with the applicable product-specific safety requirements. The verified excerpts do not provide isolation ratings or absolute maximum ratings, so they cannot be used to justify a safety design.
Informations de conformité
The verified excerpts do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals compliance. AEC-Q100 is not applicable because LM2893N is a general-purpose carrier-current transceiver and no automotive qualification is identified.
