LT1342CG - 5V RS-232 Transceiver | Analog Devices
部品番号: LT1342CG ✗ 生産終了| 数量 | 単価 | 小計 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
LT1342CG 概要
An RS-232 transceiver is an interface IC that combines line drivers and receivers for serial data transmission over the RS-232 standard. The LT1342 belongs to the broader line-driver/receiver and interface-IC hierarchy, converting between digital logic levels and RS-232 signal levels. Its 3 V logic interface allows connection to modern low-voltage digital systems while the RS-232 side operates from a 5 V supply.
The verified product information identifies three drivers, five receivers, 0.2 µF charge-pump capacitors, 1 µA shutdown supply current, low-power driver disable, and ESD protection exceeding ±10 kV. The device also operates above 120 kbaud with heavy capacitive loads, supports 250 kBaud operation for 1000 pF, and is pin compatible with the LT1137A. These features make it suitable for compact serial links where low supply current and direct 3 V logic interfacing are important.
The LT1342CG is packaged as a 28-pin SSOP from Linear Technology, now part of Analog Devices. The “G” package code and SSOP form factor are identified in distributor and cross-reference results. The device also supports shutdown, allowing drivers and receivers to assume high-impedance states and reducing supply current to near zero. This is useful for portable equipment where system power conservation and bus isolation affect battery life.
Typical applications include notebook computers, palmtop computers, and other equipment requiring an RS-232 port with a 3 V host logic connection. The 0.2 µF charge-pump capacitors help reduce external capacitor size, while the driver-disable function allows individual transmitters to be placed into a low-power state. The device is intended for systems where EIA RS-232 compliance, low supply current, and compact packaging are priorities.
When laying out a board, place the charge-pump capacitors close to their associated pins and preserve the verified package pin assignments. Confirm the interface voltage levels, baud rate, capacitive loading, and shutdown-control polarity in the system specification. The LT1342CG is an interface IC rather than a power semiconductor, so a safe-operating-area specification does not apply.
This product page combines verified Analog Devices and distributor information with interface-specific application guidance, design cautions, and selection criteria to support practical RS-232 design decisions.
ドロップイン代替品: LT1342CG — 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。
クイック比較ツール — 並列比較する代替部品を選択:
LT1137A
✅ ドロップイン📋 参考代替品（カタログ未掲載）
LT1342CG 仕様
| Device Type | RS-232 transceiver |
| Number of Drivers | 3 |
| Number of Receivers | 5 |
| 電源電圧 | 5 V |
| Logic Supply Voltage | 3 V |
| Logic Interface | 3 V logic interface |
| Charge-Pump Capacitors | 0.2 µF |
| Shutdown Supply Current | 1 µA |
| データレート | In excess of 120 kbaud |
| Operation at 2500 pF Load | 120 kbaud |
| Operation at 1000 pF Load | 250 kbaud |
| ESD Protection | Over ±10 kV |
| Driver Disable | Low-power driver disable |
| Shutdown Behavior | Drivers and receivers assume high-impedance states |
| Pin Compatibility | Pin compatible with LT1137A |
| パッケージ | 28-pin SSOP |
| Package Code | SSOP |
| Terminal Count | 28 terminals |
| 実装タイプ | Surface mount |
| Interface Standard | EIA RS-232 |
| Applications | Notebook computers and palmtop computers |
LT1342CG ssop ピン配置ガイド
LT1342CG (ssop パッケージ) のピン配置。 ピン番号、機能、接続図はメーカーのデータシートで定義されています。正確なフットプリントとはんだ付けのガイドラインについては、データシートを参照してください。
詳細なピン配置データはありません: LT1342CG.
詳細は データシート をご参照ください。
主な用途
LT1342CG の用途: 6 件s: Notebook Computer Serial Port, Palmtop Computer Interface, Portable RS-232 Data Link, Embedded Equipment Configuration Port, Instrument Serial Communication, Industrial Control Module.
Notebook Computer Serial Port
The LT1342CG fits a notebook computer interface requiring an RS-232 driver and receiver stage alongside a 3 V host logic domain. Its three drivers and five receivers provide multiple serial-line functions in one 28-pin SSOP. The verified information identifies notebook computers as an intended application, while the 3 V logic interface allows connection to suitable low-voltage logic without an additional level-shifting stage. Keep the charge-pump capacitors close to the device and verify the actual cable length and baud rate during system validation.
おすすめ
Palmtop Computer Interface
The LT1342CG is suitable for compact palmtop equipment that needs an RS-232 connection while conserving board area and power. Its 28-pin SSOP package combines three drivers and five receivers, and the verified feature list includes 1 µA shutdown supply current for low-power operation. The 3 V logic side can connect to compatible digital circuits, while the RS-232 side operates from 5 V. Validate the transceiver’s driver-disable and shutdown states to prevent unnecessary current draw when the serial port is idle.
おすすめ
Portable RS-232 Data Link
For portable equipment, the LT1342CG provides an RS-232 line interface with explicit power-management controls. Shutdown places drivers and receivers in high-impedance states, and the verified 1 µA shutdown supply current can reduce current consumption when the port is not active. The device also offers a low-power driver-disable function for transmitters that are not in use. The design must still account for the 5 V RS-232 supply and the 3 V logic supply, including sequencing requirements across the complete system.
おすすめ
Embedded Equipment Configuration Port
The LT1342CG can provide a wired configuration or service connection for embedded equipment that uses a 3 V control logic domain and an RS-232 service port. Multiple drivers and receivers allow the system to support several signal directions or diagnostic functions in one device. The verified operating data indicates operation above 120 kbaud and defined performance at capacitive loads, but the actual usable rate depends on cable length, termination, noise, and firmware timing. Confirm signal polarity and shutdown behavior in the service-port specification.
おすすめ
Instrument Serial Communication
The LT1342CG is appropriate for test and measurement equipment requiring a short-distance RS-232 control or data link with a modern 3 V logic interface. Its 5 V RS-232 supply and 3 V logic interface separate external line-level signaling from the host-side digital domain. The transceiver’s specified 250 kBaud capability at 1000 pF can help when the connected load is light, although real cable capacitance and protection-network loading must be included in system validation. Use the official datasheet for pin and charge-pump layout details.
おすすめ
Industrial Control Module
The LT1342CG can serve as the RS-232 interface in a small industrial control module where a 3 V microcontroller or logic device must communicate with a legacy RS-232 peripheral. Its three drivers and five receivers provide a useful mix of transmit and receive channels in one package. The manufacturer identifies notebook and palmtop applications, while the electrical feature set supports broader point-to-point serial links. Before deployment, verify industrial temperature requirements, surge protection, isolation strategy, and cable grounding because those requirements are not established by the supplied snippets.
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: LT1342CG — 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 | LT1137A |
|---|---|---|
| Device Type | RS-232 transceiver | RS-232 transceiver family member |
| Package | 28-pin SSOP | 28-pin SSOP |
| Brand | Analog Devices | Linear Technology |
| Pin Compatibility | Pin compatible with LT1137A | Pin-compatible reference |
主な差別化要因
- Direct 3 V logic integration （vs LT1137A)
- Power-conscious shutdown behavior （vs LT1137A)
- Specified high-speed capacitive-load operation （vs LT1137A)
設計ノート
Place the verified 0.2 µF charge-pump capacitors close to the associated LT1342CG pins and keep their return paths short. Follow the manufacturer datasheet layout for capacitor placement and grounding. Because the device uses a 5 V RS-232 supply and a 3 V logic supply, keep noisy RS-232 driver-current paths away from sensitive logic routing and preserve the recommended ground reference.
Treat the 5 V RS-232 supply and 3 V logic supply as separate rails that require correct sequencing and adequate decoupling. The verified shutdown specification is 1 µA supply current, so a design that expects low standby consumption should also verify that the external supply and pull networks do not add significant leakage. Check whether the host or peripheral requires the transceiver to remain powered during reset.
Do not assume that a matching SSOP package alone guarantees a drop-in replacement. The verified LT1342CG data identifies a 3 V logic interface, 5 V RS-232 supply, 3 drivers, 5 receivers, and particular charge-pump capacitors. Compare every pin, supply level, enable polarity, shutdown behavior, and external capacitor connection in the official datasheet before replacing the part or changing an existing PCB.
コンプライアンス情報
The supplied verified results do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. The LT1342CG is an interface IC, not a power semiconductor, so a safe-operating-area specification is not applicable.