MAX3483EEPA+ - 12Mbps 3.3V RS-485/RS-422 Transceiver | Maxim
部品番号: MAX3483EEPA+ ✓ 生産中MAX3483EEPA+ 概要
An RS-485 transceiver is a line-driver and line-receiver pair that converts between differential logic-level signals and balanced, noise-immune differential bus wiring. The MAX3483EEPA+ belongs to the wider RS-485 transceiver family of interface ICs, which sit at the boundary between logic-level digital systems and long-distance, multi-drop field-bus cabling used in industrial automation, building controls and instrumentation networks.
Key features include a slew-rate-limited driver that limits EMI and reduces reflections on unterminated or lightly terminated cables, a 50 mV receiver hysteresis that rejects noise and prevents chatter around the logic threshold, and true half-duplex operation where the driver and receiver share a single differential pair. The MAX3483EEPA+ is the E-qualified member of the MAX3483E family, which also includes the MAX3485E, MAX3486E, MAX3488E, MAX3490E and MAX3491E in the same 8-pin PDIP footprint.
Architecturally the device combines a differential driver stage with a comparator-based receiver and an enable-controlled direction logic block, so the DE and /RE pins can be tied together for automatic half-duplex operation or driven separately for bus arbitration scenarios. Because the driver edges are slew limited rather than edge-triggered at full CMOS speed, the part is well suited to point-to-point and short multidrop links running at megabit-class rates.
Typical uses include industrial PLC and DCS remote I/O modules, RS-485 to RS-232 gateway boards, POS and kiosk peripherals, building HVAC controllers, CNC machine tool links, and instrumentation buses carrying sensor data back to a host controller. It is also frequently used in prototype and instrumentation benches where a through-hole DIP package is easier to hand-solder and rework than a fine-pitch surface-mount alternative.
When designing around this part, confirm the cable length and termination strategy against the intended data rate, keep the differential pair tightly coupled and away from switching nodes, and connect the unused receiver output to a defined logic level so noise cannot float into the digital domain. Review the pin-description table in the manufacturer datasheet when assigning PCB tracks, and use the Request a Quote form on this page for current lead time and stock.
ドロップイン代替品: MAX3483EEPA+ — 同一パッケージでピン互換。PCBの作り直しが必要な異なるパッケージの部品は除外されています。
このシリーズのバリエーション
同一シリーズでドロップイン互換のモデル: MAX3483EEPA+ （同一形状・フットプリント） — 相違点: Package, Supported Standards, ESD Protection, Maximum Data Rate, Mounting Type.
MAX3483ECPA+
✅ ドロップイン価格はお問い合わせください
データシートを見る →MAX3485EEPA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3486EEPA+
✅ ドロップイン📋 参考代替品（カタログ未掲載）
MAX3490EEPA+
✅ ドロップイン価格はお問い合わせください
データシートを見る →MAX3483CPA+
✅ ドロップイン価格はお問い合わせください
データシートを見る →MAX3483EEPA+ 仕様
| Protocol / Standard | RS-485 / RS-422 |
| Transceiver Configuration | 1 driver / 1 receiver |
| Duplex Mode | Half-duplex |
| Supply Voltage Range | 3.0 V to 3.6 V |
| Maximum Data Rate | 12 Mbps |
| ESD Protection | ±15 kV |
| Receiver Hysteresis | 50 mV |
| Driver Slew Rate | Slew-rate limited (EMI controlled) |
| 動作温度範囲 | -40 °C to +85 °C |
| Temperature Grade | Industrial |
| パッケージ | 8-PDIP (8-pin plastic DIP, through-hole) |
| 実装タイプ | Through Hole |
| Number of Terminals | 8 |
| Package Shape | Rectangular |
MAX3483EEPA+ ピン構成
| ピン 1 | ROUT — Receiver output (logic-level data output) |
| ピン 2 | /RE — Receiver enable, active low (pull low to enable receiver) |
| ピン 3 | DE — Driver enable (pull high to enable driver) |
| ピン 4 | DI — Driver input (logic-level data input) |
| ピン 5 | GND — Ground |
| ピン 6 | A — Non-inverting driver output (A line of differential pair) |
| ピン 7 | B — Inverting driver output (B line of differential pair) |
| ピン 8 | VCC — Positive supply, 3.0 V to 3.6 V |
主な用途
MAX3483EEPA+ の用途: 6 件s: Industrial PLC and DCS Remote I/O Modules, RS-485 to RS-232 Gateway Boards, Building HVAC and Environmental Controllers, CNC Machine Tool and Servo Drive Links, Instrumentation and Sensor Data Acquisition, Point-of-Sale and Retail Peripherals.
Industrial PLC and DCS Remote I/O Modules
The MAX3483EEPA+ suits remote I/O and field-bus termination blocks in PLC and DCS installations because it delivers a 12 Mbps data rate with ±15 kV ESD protection on every pin while running from a 3.0 V to 3.6 V supply. The slew-rate-limited driver keeps radiated EMI low on the cabinet wiring, and the 50 mV receiver hysteresis rejects noise on long cable runs without adding meaningful propagation delay. Place the device at the bus end of the board, terminate the A/B pair with 120 ohms, and bias the line once at the master node so the differential bus holds a defined idle state when the transceiver is disabled.
おすすめ
RS-485 to RS-232 Gateway Boards
A protocol gateway board built around the MAX3483EEPA+ can bridge a 3.3 V RS-232 host port to a 3.3 V RS-485 field bus, using the half-duplex 1/1 configuration with DE and /RE tied together for automatic direction control. The 12 Mbps ceiling leaves ample margin for the kilobit-class traffic typical of Modbus RTU, while the ±15 kV ESD rating protects the gateway when cables are field-terminated and unplugged under power. Keep the transceiver driver and receiver pins away from the switching supply section of the board, and route the differential pair as a coupled pair over a solid ground plane to avoid reflections on the cable run.
おすすめ
Building HVAC and Environmental Controllers
Building automation controllers running on 24 V rails with a 3.3 V logic domain use the MAX3483EEPA+ to bring supervisory and sensor data back over an RS-485 backbone. The 3.0 V to 3.6 V operating supply matches the controller MCU rail, the -40 °C to +85 °C industrial range covers plant-room temperature swings, and the slew-limited edges reduce emissions into adjacent thermostat and relay wiring. Termination and fail-safe biasing can be fitted at the bus segment ends rather than at every node, so a long chain of controllers does not over-terminate the line.
おすすめ
CNC Machine Tool and Servo Drive Links
Machine-tool control boards that move motion and position data between a controller and remote axis drives can use the MAX3483EEPA+ on an RS-485 position bus. The 12 Mbps rate provides ample bandwidth for real-time motion traffic while the receiver hysteresis of 50 mV rejects the electrical noise typical of motor drives sharing the same cabinet. The industrial temperature grade of -40 °C to +85 °C supports unheated enclosures, and the through-hole 8-pin PDIP package is convenient for prototype and rework-heavy machine control boards.
おすすめ
Instrumentation and Sensor Data Acquisition
Data acquisition front-ends that aggregate outputs from remote sensors use the MAX3483EEPA+ to carry measurement records over an RS-485 instrument bus. The low 3.3 V supply keeps the node power budget small for battery-backed field instruments, while the ±15 kV ESD rating protects the front-end when sensors are cabled outside the enclosure and exposed to human contact. The half-duplex 1/1 arrangement fits polled multidrop networks where only one node drives at a time, and the 12 Mbps rating allows the same bus to carry burst downloads of logged data between polls.
おすすめ
Point-of-Sale and Retail Peripherals
Point-of-sale terminals, scales and receipt printers frequently hang off an RS-485 bus in stores where USB and RS-232 cables are impractical. The MAX3483EEPA+ gives the terminal a 3.3 V single-rail interface that runs up to 12 Mbps for fast burst transfers, and the ±15 kV ESD protection is valuable in a retail environment where peripherals are plugged and unplugged by staff on carpeted floors. The half-duplex topology supports several polled peripherals on one pair, and the small 8-pin DIP footprint keeps the cost of an extra peripheral port low.
おすすめ
おすすめ製品の概要
エンジニアリング参考データ: MAX3483EEPA+ — 比較、設計ガイダンス、コンプライアンス情報。
選定ガイド
代替品との比較
| パラメータ | この製品 | MAX3483ECPA+ | MAX3485EEPA+ | MAX3486EEPA+ | MAX3490EEPA+ | MAX3483CPA |
|---|---|---|---|---|---|---|
| Brand | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Package | 8-PDIP (through-hole) | 8-PDIP (through-hole) - same | 8-PDIP (through-hole) - same | 8-PDIP (through-hole) - same | 8-PDIP (through-hole) - same | 8-PDIP (through-hole) - same |
| Protocol Support | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 | RS-485 / RS-422 |
| ESD Protection | ±15 kV | ±15 kV | ±15 kV | ±15 kV | ±15 kV | Not the E-qualified ±15 kV variant |
| Drivers / Receivers | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 | 1 / 1 |
| Duplex Mode | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex | Half-duplex |
主な差別化要因
- ESD protection on every pin in a through-hole DIP package （vs MAX3483CPA)
- Full 12 Mbps slew-limited operation without the half-rate compromise （vs MAX3486EEPA+)
- True fail-safe receiver available in the identical footprint for noisy field buses （vs MAX3483EEPA+)
- Hand-solderable 8-pin PDIP footprint instead of a surface-mount option （vs MAX3483ECPA+)
設計ノート
Route the A and B differential pair as a tightly coupled pair over a continuous ground plane, and keep it away from switching nodes, inductors and high-current return paths. Cross-coupling between the pair is what causes radiated emissions and reflections, so avoid routing A over B on adjacent layers with long parallel runs to unrelated circuitry. Place the optional 120 ohm termination resistor and the fail-safe bias network close to the transceiver pins rather than at the connector, so the stub length between the driver and the load point stays short.
Do not leave the receiver output floating or leave /RE and DE both de-asserted without pulling the unused receiver output to a defined logic level, because noise on an unconnected logic input can toggle downstream firmware unexpectedly. Tie /RE and DE together for automatic half-duplex direction control only when the design cannot tolerate both outputs driving at once; otherwise drive them separately so the receiver can stay enabled while the transmitter is idle.
Estimated: the MAX3483EEPA+ driver quiescent and load current are small compared with the transceiver's digital load, so the dominant supply requirement is decoupling rather than raw current. Place a 0.1 uF ceramic bypass capacitor directly across VCC and GND at the device pins, and add a 1 uF to 10 uF bulk capacitor close to the device. Keep the supply ground return short so switching noise on the 3.3 V rail does not modulate the differential bus threshold.
The slew-rate-limited driver is the main reason this transceiver family is preferred in cabinets: slower edges spread less spectral energy and reduce radiated emissions compared with a full CMOS-rate driver. Do not defeat this benefit by adding external edge-shaping or by placing a fast logic buffer directly on the A/B lines. If a design must run at 12 Mbps, keep the differential pair short, use proper twisted-pair cable with characteristic impedance close to the termination value, and verify emissions with the final cable length in place.
コンプライアンス情報
The device is listed as a production part by Analog Devices for the MAX3483 and MAX3483E families. RoHS, REACH, lead-free and halogen-free status were not confirmed in the retrieved listings and should be confirmed against the manufacturer declaration before release.
