SN75174NG4 - Quad RS-485 Driver, 4 MBd | Texas Instruments
MPN： SN75174NG4 ✓ 啟用中SN75174NG4 概覽
A differential line driver is a digital interface component that converts one-sided logic signals into balanced differential outputs. A differential line-driver IC belongs to the broader interface-IC hierarchy, where driver and receiver devices support communication across cables, backplanes, and industrial buses. Balanced signaling improves noise immunity by combining equal-and-opposite signal paths, making this type of driver useful where ground potential differences and coupled noise can affect single-ended links.
According to the Texas Instruments SN75174 datasheet, the SN75174 is designed to meet ANSI EIA/TIA-422-B, RS-485, and ITU Recommendation V.11 requirements. Its key operating features include four driver channels, 3-state output capability, operation up to 4 megabaud, and wide positive and negative common-mode output voltage ranges. The wide output range supports party-line bus arrangements in electrically noisy environments.
The monolithic implementation provides four differential drivers in one package, reducing the number of separate line-driver packages required for a multi-channel communications interface. The 3-state outputs permit a driver to enter a high-impedance state when it is not actively driving a bus. This feature supports shared-bus architectures and gives system designers control over which connected node participates in transmission.
Typical uses include industrial RS-485 equipment, EIA/TIA-422-B balanced data links, multidrop party-line networks, instrumentation interfaces, and communications equipment requiring several differential outputs. Because the device is intended for balanced multipoint transmission, system design should account for cable impedance, termination, grounding, and the electrical behavior of every node connected to the bus.
Designers should use the manufacturer pin-description table when assigning PCB tracks and should verify the device's electrical limits and enable-control behavior against the specific system interface. Care is also needed when combining outputs on a shared bus so that multiple 3-state drivers are never enabled simultaneously, as simultaneous active outputs can produce contention.
This page combines the manufacturer's device information with practical interface-design guidance, application-fit analysis, and a package-focused comparison framework. It is intended to help engineers identify when the SN75174NG4 belongs in an RS-485 or EIA/TIA-422-B design before beginning board-level implementation.
直接替換替代品，適用於 SN75174NG4 — 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。
此系列的變體
與下列產品可直接替換的同系列型號： SN75174NG4 （相同外形與佔位） — 差異在於 Mounting Type, Output State, Package, Product Type.
SN75174N
✅ 直接替換聯絡詢價
查看資料表 →SN75174P
✅ 直接替換 ⚠️ 規格未經驗證📋 參考替代品（不在目錄中）
SN75174NG4 規格
| Product Type | Quad differential line driver |
| Number of Driver Channels | 4 channels |
| Maximum Signaling Rate | 4 megabaud |
| Output State | 3-state |
| Supported Standards | ANSI EIA/TIA-422-B, RS-485, and ITU Recommendation V.11 |
| Bus Architecture | Balanced multipoint transmission |
| Common-Mode Output Range | Wide positive and negative range |
| 封裝 | 16-pin plastic dual in-line package (16-PDIP) |
| Package Pin Count | 16 pins |
| 安裝類型 | Through-hole dual in-line |
SN75174NG4 16 pins 腳位配置指南
SN75174NG4（16 pins 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： SN75174NG4.
請參閱 資料表 以查看完整腳位配置。
典型應用
SN75174NG4 適用於 6 應用s: Industrial RS-485 Communication, EIA/TIA-422-B Balanced Data Link, Multidrop Party-Line Network, Instrumentation Control Interface, Data Acquisition Equipment, Noise-Prone Communications Equipment.
Industrial RS-485 Communication
The SN75174NG4 is appropriate for industrial equipment that needs multiple balanced RS-485 transmit channels in one package. According to the Texas Instruments SN75174 datasheet, the device supports balanced multipoint transmission at rates up to 4 megabaud and provides 3-state outputs for shared-bus control. Place the IC behind the system's logic-level interface and terminate the bus according to its topology. The four-channel package can reduce board area, but each output pair still requires correct differential routing and adequate grounding.
EIA/TIA-422-B Balanced Data Link
The SN75174NG4 can implement several EIA/TIA-422-B transmit channels because the manufacturer identifies the device as compliant with ANSI EIA/TIA-422-B requirements. Its four differential outputs operate at rates up to 4 megabaud, while the wide positive and negative common-mode output range supports practical cable environments. Use the pin-description table to map logic inputs and differential outputs, and preserve controlled return paths to minimize common-mode conversion and cable-radiated noise.
Multidrop Party-Line Network
The SN75174NG4 fits a multidrop bus in which multiple nodes share the same communication conductors. The Texas Instruments SN75174 datasheet identifies 3-state outputs and a wide common-mode output range as features suited to party-line transmission in noisy environments. Controlling the device enable so only one node drives the bus at a time prevents output contention. Cable length, stub length, topology, and termination should be validated together because the 4 megabaud device rating does not remove channel-dependent limits.
Instrumentation Control Interface
The SN75174NG4 is useful in test and measurement equipment requiring several balanced command or data outputs. Four differential driver channels provide compact bus-driver capacity at speeds up to 4 megabaud, while the 3-state function permits interface sharing. Place the device near the connector and cable-entry area to minimize trace mismatch, provide a stable low-noise reference for the logic side, and follow the manufacturer's pinout exactly. The interface still requires suitable protection if the cable leaves the equipment enclosure.
Data Acquisition Equipment
Data acquisition systems can use the SN75174NG4 to distribute balanced control signals to multiple peripheral modules. The quad differential driver provides four channels at up to 4 megabaud and is designed around EIA/TIA-422-B and RS-485 electrical requirements. Route each differential pair as a controlled impedance path with symmetrical geometry and avoid adding long stubs between nodes. Because this IC only drives signals, input conversion and receiver functions must be implemented separately.
Noise-Prone Communications Equipment
The wide positive and negative common-mode output range makes the SN75174NG4 suitable for balanced communications equipment operating in electrically noisy environments. According to the Texas Instruments SN75174 datasheet, these output characteristics support party-line transmission, while the 3-state outputs permit inactive bus nodes to present a high impedance. Use a sound grounding and shielding strategy, keep cable connections away from switching nodes where practical, and verify the interface under worst-case common-mode conditions.
工程參考資料，適用於 SN75174NG4 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | SN75174N | SN75174P |
|---|---|---|---|
| Package | 16-PDIP | 16-PDIP | 16-PDIP |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Device Type | Quad differential line driver | Quad differential line driver | Quad differential line driver |
| Driver Channels | 4 channels | 4 channels | 4 channels |
| Maximum Data Rate | 4 megabaud | 4 megabaud | 4 megabaud |
| Output State | 3-state | 3-state | 3-state |
主要差異化特點
- Four differential channels in one package (對比SN75174N)
- Multipoint bus operation at 4 megabaud (對比SN75174P)
- Standards-oriented differential interface support (對比SN75174N)
設計說明
Ensure that only one SN75174NG4 driver channel is actively driving a shared bus at a time. The device's 3-state outputs are intended for multipoint and party-line use, but simultaneous active outputs can cause contention and unpredictable voltage. Define a fail-safe enable strategy so that reset, power-up, fault, and firmware states leave unused or disconnected nodes in a high-impedance condition.
Route each differential output as a closely coupled pair with matched geometry and a continuous ground reference beneath or beside the pair. Avoid long stubs, right-angle transitions, and unnecessary vias because these features can degrade signal integrity and increase radiated noise at the 4 megabaud device limit. Keep the interface path away from switching power nodes and place any required bus termination close to the line-driver connection according to the system topology.
Balanced outputs reduce susceptibility to common-mode noise but do not eliminate cable radiation. Use a controlled cable impedance, proper ground references, and screened connectors where the interface leaves an enclosure. Verify the finished design with the longest intended cable and worst-case node loading. If emissions are excessive, inspect connector return paths, cable shield termination, and any unbalanced test equipment connected to the bus.
合規資訊
The verified product information confirms the interface standards but does not state the environmental, lead-free, halogen-free, or conflict-minerals status for the exact SN75174NG4 orderable suffix.
