LT1281IJ - 5V Dual RS-232 Transceiver, 16-DIP | ADI
MPN： LT1281IJ ✓ 啟用中LT1281IJ 概覽
A transceiver combines a line driver and line receiver into one interface component. RS-232 is a differential-enough, single-ended serial interface defined by voltage levels and circuit behavior rather than a balanced differential physical signal. In the signal chain, the driver translates digital logic levels to RS-232-level voltages, while the receiver converts incoming RS-232 signals back to logic levels. The dual arrangement provides two channels in one IC and can reduce board area relative to separate single-channel devices.
The LT1281 family is associated with low-power operation and 0.1 uF external-capacitor support according to the Analog Devices product page. The verified material specifically names the LT1281IJ as an industrial-temperature, 16-terminal DIP variant. Operating temperature is listed as -40 C to +85 C. Other electrical details such as driver output levels, receiver thresholds, data rate, quiescent current, and propagation delay were not included in the supplied verified text and therefore require confirmation from the manufacturer datasheet before release.
Typical uses include RS-232 ports in industrial control equipment, data acquisition systems, test instruments, barcode readers, legacy computers, and embedded serial-console links. The receiver may also be useful where a system needs RS-232 receive conversion independently of the driver. Designers should validate signal amplitude, capacitance, cable length, grounding, and compatibility with the connected equipment. Do not substitute a TTL-only transceiver because logic-level compatibility does not establish RS-232 compliance.
This 16-DIP device is most appropriate when through-hole assembly, industrial-temperature operation, and a dual RS-232 channel are priorities. Surface-mount systems should use a verified pin-compatible DIP alternative if one exists, whereas different package families require layout changes. This page separates supplied facts from unverified parameters and avoids inferring electrical values that were not present in the retrieved source material.
直接替換替代品，適用於 LT1281IJ — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品LT1281IJ 規格
| Product Type | RS-232 dual driver/receiver transceiver |
| Channel Configuration | 2 drivers / 2 receivers |
| Technology | Bipolar RS-232 |
| 供應電壓 | 5 V |
| 工作溫度 | -40 C to +85 C |
| Temperature Grade | Industrial |
| 封裝 | 16-pin DIP |
| Package Code | DIP |
| Terminal Count | 16 |
| Package Shape | Rectangular |
| Terminal Form | Through-hole |
| Pitch | 7.62 mm |
| External Capacitor Value | 0.1 uF |
| Logic Family | RS-232 line transceiver |
| 安裝類型 | Through-hole insertion |
| Manufacturer Product Family | LT1281A low-power 5 V RS-232 dual driver/receiver |
LT1281IJ rectangular 腳位配置指南
LT1281IJ（rectangular 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： LT1281IJ.
請參閱 資料表 以查看完整腳位配置。
典型應用
LT1281IJ 適用於 6 應用s: Industrial RS-232 Controller Interface, Data-Acquisition Equipment, Test and Measurement Console, Barcode Reader and Peripheral Connectivity, Embedded Serial Service Port, Legacy Computer Peripherals.
Industrial RS-232 Controller Interface
The LT1281IJ fits an industrial controller that requires two RS-232 channels from a single 5 V interface IC. Its verified 2-driver/2-receiver organization can connect one local console and one external instrument while retaining the -40 C to +85 C industrial operating range. The 16-pin DIP package is particularly convenient for through-hole control boards where a compact surface-mount footprint is not required. Designers should confirm data rate, receiver thresholds, enable functions, and capacitor connections in the full manufacturer datasheet, because those values were not present in the supplied excerpts.
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Data-Acquisition Equipment
The LT1281IJ can provide legacy serial connectivity in laboratory and industrial data-acquisition units that exchange commands or measurements through RS-232 ports. Two receivers allow two incoming channels, while two drivers support two outbound lines where the protocol requires them. Its 5 V supply aligns with many mixed-signal systems, and the industrial-temperature range supports controlled equipment environments. Signal integrity still depends on cable capacitance, data rate, grounding, and protection, all of which must be evaluated from complete electrical specifications rather than inferred from the RS-232 label.
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Test and Measurement Console
The LT1281IJ suits legacy test equipment that uses RS-232 for front-panel consoles, printer ports, calibration interfaces, or service commands. Two communication channels can simplify multiport equipment, and the 16-pin DIP package is useful for repair-oriented products assembled with through-hole parts. Its verified industrial grade supports operation from -40 C to +85 C. When integrating the port, validate logic polarity, shutdown or enable behavior, receiver tolerance for noisy cables, and external capacitor values against the complete LT1281A documentation before freezing the PCB.
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Barcode Reader and Peripheral Connectivity
The LT1281IJ can connect barcode scanners, label printers, scales, and other legacy peripherals that retain an RS-232 interface. Its dual-channel arrangement can support separate device and host-control paths when the attached equipment uses two communication lines. The 5 V supply and through-hole 16-DIP package suit older industrial peripheral designs and repair platforms. For field reliability, add appropriately selected cable transient protection and verify that the transceiver’s electrical thresholds match the peripheral driver rather than assuming all RS-232 ports have identical signaling behavior.
推薦
Embedded Serial Service Port
The LT1281IJ is appropriate for embedded equipment that must retain an RS-232 service connector for configuration, diagnostics, firmware loading, or production testing. The two receivers can assist boot, status, or handshake monitoring, while the drivers support host-facing links. Its industrial-temperature rating is useful in unattended equipment, and the DIP package simplifies through-hole assembly. Before release, verify the system’s logic supply compatibility, confirm whether any pins require external pull-up or enable conditioning, and validate startup behavior across the manufacturer-supported supply and temperature conditions.
推薦
Legacy Computer Peripherals
The LT1281IJ can preserve RS-232 connectivity in legacy computer peripherals, adapters, and industrial terminal equipment where a modern USB-only redesign is impractical. Its dual driver/receiver configuration supports established RS-232 link topologies, and the 5 V operation fits many controller boards. The through-hole DIP package is advantageous where manual rework and socketed or leaded assembly are preferred. Designers must still account for unused channels, isolation requirements, grounding, and cable ESD protection; the component does not provide verified galvanic isolation in the supplied data.
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推薦產品摘要
工程參考資料，適用於 LT1281IJ — 比較、設計指引及合規資訊。
選型指南
設計說明
Do not treat every dual RS-232 IC as pin-compatible. The verified LT1281IJ package is a 16-pin DIP, but the supplied material does not provide pin names, driver-enable behavior, receiver-enable behavior, or charge-pump connections. Before choosing MAX211IDB, MAX3232CD, or another family member, compare every terminal and external capacitor against the LT1281A datasheet. A change from DIP to SOIC requires a PCB redesign and is not a drop-in substitution.
Keep RS-232 driver traces short and route them away from sensitive analog or clock signals. Place the manufacturer's required charge-pump and bypass capacitors close to their associated pins, using the exact network shown in the full datasheet. The verified family description references 0.1 uF capacitors, but it does not establish every connection or voltage rating. Maintain a continuous ground reference and use the longest practical ground return where cable and enclosure currents can otherwise create ground potential differences.
Validate receiver thresholds and driver levels against the connected equipment rather than relying only on the RS-232 name. Cable length, capacitance, data rate, and ground offsets can determine whether a link is reliable. The supplied snippets do not include maximum data rate, propagation delay, slew behavior, or logic thresholds, so timing margins cannot be calculated from this record. Obtain the complete family datasheet and measure the intended baud rate with representative cable and loading before production release.
合規資訊
The supplied verified snippets do not state RoHS, REACH, lead-free, halogen-free, or conflict-minerals status. AEC-Q100 is not applicable to this industrial interface IC based on the supplied product classification, but no automotive qualification is claimed.
