DAC8742HPBSR - HART and PROFIBUS PA Modem | Texas Instruments
MPN： DAC8742HPBSR ✓ 啟用中DAC8742HPBSR 概覽
A HART modem is an industrial communication interface that overlays analog process-control signals with digital data. The DAC8742H family combines modem functionality with an interface suitable for sensors, actuators, transmitters, and fieldbus equipment. Its protocol support links it to FOUNDATION Fieldbus and PROFIBUS PA systems, where robust physical-layer signaling and low-power operation are important for factory automation, process control, and connected industrial instruments.
The primary verified features are compatibility with HART, FOUNDATION Fieldbus, and PROFIBUS PA; support for both UART and SPI host interfaces; operation as a half-duplex HART modem in master or slave mode; and integration of the required circuitry with minimal external filtering components. The low-power architecture targets industrial equipment where a dedicated modem without excessive board area or power consumption is valuable. Exact supply ratings, current limits, data rates, and temperature limits are not present in the supplied excerpts and therefore are not asserted here.
For a HART master, the device works with the transmitter and receiver circuitry associated with a multidrop fieldbus. For a slave, it supports a field device that communicates over the same physical network. UART/SPI host connectivity allows a microcontroller, industrial communications controller, or programmable logic controller to configure and supervise the modem. These roles make the DAC8742HPBSR relevant to transmitters, pressure and temperature instruments, valve positioning systems, industrial I/O modules, and process-control gateways.
The principal design consideration is analog and communication robustness. The 32-pin TQFP requires a controlled high-density PCB layout, adequate ground-plane continuity, and careful treatment of modem and interface routing. Power-supply filtering and external component selection should follow the manufacturer datasheet rather than generic guidance. Because the supplied data does not expose the complete electrical tables or pin mapping, engineers should confirm pinout, bypass requirements, isolation requirements, and timing limits before layout release.
This product page combines the verified manufacturer identity, distributor availability, package information, protocol coverage, and interface capabilities with structured engineering guidance. It also distinguishes documented facts from parameters that still require confirmation from the complete Texas Instruments DAC8742H datasheet, helping procurement and design teams assess fit before committing to a PCB or production release.
直接替換替代品，適用於 DAC8742HPBSR — 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： DAC8742HPBSR （相同外形與佔位） — 差異在於 Host Interface, Product Type.
DAC8742HPBS
✅ 直接替換聯絡詢價
查看資料表 →DAC8742HPBSR 最大額定值與電氣特性
| Product Type | HART, FOUNDATION Fieldbus, and PROFIBUS PA-compatible modem |
| Host Interface | UART and SPI |
| HART Operating Mode | Half-duplex master or slave |
| Protocol Support | HART, FOUNDATION Fieldbus, PROFIBUS PA |
| 封裝 | 32-pin TQFP (5 mm × 5 mm) |
| 安裝類型 | Surface mount |
| Integrated Modem Circuitry | Required HART physical-layer circuitry integrated |
| External Filtering Components | Minimal external components |
| Power Classification | Low-power modem |
| Target Market | Industrial process control and industrial automation |
| Manufacturer | Texas Instruments |
| 腳位數 | 32 pins |
DAC8742HPBSR 32-pin tqfp (5 mm × 5 mm) 腳位配置指南
DAC8742HPBSR（32-pin tqfp (5 mm × 5 mm) 封裝）的腳位配置。 此類比元件具有輸入、輸出與電源腳位。偏移歸零、補償與致能腳位配置請參閱製造商資料表。適用於訊號調理與放大器電路。
無詳細腳位定義資料： DAC8742HPBSR.
請參閱 資料表 以查看完整腳位配置。
典型應用
DAC8742HPBSR 適用於 6 應用s: HART Communicating Field Transmitter, PROFIBUS PA Process-Control Module, FOUNDATION Fieldbus Valve Positioner, Industrial Pressure and Level Transmitter, HART Handheld Commissioning Tool, Industrial Sensor-to-Fieldbus Gateway.
HART Communicating Field Transmitter
The DAC8742HPBSR fits a smart transmitter that must superimpose digital information on an analog process signal. Its integrated HART physical-layer circuitry supports half-duplex operation in master or slave mode, while UART or SPI lets a sensor-conditioning microcontroller manage commands and diagnostics. The verified 32-pin TQFP provides a compact implementation for pressure, temperature, level, and flow instrumentation. Designers should use the manufacturer reference circuit to select coupling, filtering, protection, and bypass components, and must verify the complete electrical limits before production.
推薦
PROFIBUS PA Process-Control Module
The DAC8742HPBSR is relevant to PROFIBUS PA-compatible process-control hardware because it combines a dedicated fieldbus modem with selectable UART or SPI host connectivity. A field I/O module can use the host interface to exchange configuration and measurement data while the integrated modem handles the physical communication layer. The low-power 32-pin TQFP implementation also supports compact multi-channel modules. Final circuit design must follow the Texas Instruments datasheet for electrical limits, isolation, filtering, and application-specific network components.
推薦
FOUNDATION Fieldbus Valve Positioner
A FOUNDATION Fieldbus valve positioner needs deterministic communication alongside local actuator control. The DAC8742HPBSR provides a compatible fieldbus modem and UART or SPI connectivity to the controller performing position feedback and motor-command calculations. Its half-duplex physical-layer support is appropriate for fieldbus networks, and the 5 mm × 5 mm TQFP conserves board area in compact positioner electronics. Engineers must verify protocol timing, power specifications, and external filtering directly from the complete DAC8742H documentation.
推薦
Industrial Pressure and Level Transmitter
The DAC8742HPBSR can support digital communication in pressure, differential-pressure, and tank-level transmitters where HART compatibility enables remote configuration and diagnostics. The integrated modem reduces the need for a separate physical-layer implementation, while UART or SPI provides a straightforward connection to the sensor-conditioning and linearization electronics. The compact TQFP is useful in field-mounted instruments where board area and power are constrained. Component values and protection requirements should be taken from the manufacturer application guidance.
推薦
HART Handheld Commissioning Tool
A handheld commissioning tool can use the DAC8742HPBSR as a HART master interface when it needs to configure, interrogate, and diagnose remote transmitters. The half-duplex master capability and UART or SPI host interface suit a compact embedded controller, while the integrated physical-layer circuitry avoids duplicating modem circuits on the instrument PCB. The device can support bench-to-field communication through a protected analog interface. Designers must confirm electrical levels, timing, filtering, and output protection using the complete manufacturer datasheet.
推薦
Industrial Sensor-to-Fieldbus Gateway
The DAC8742HPBSR is suitable for gateway electronics that translate sensor or controller data into FOUNDATION Fieldbus or PROFIBUS PA-compatible network signaling. Its UART and SPI host interfaces allow different embedded processors to be evaluated without changing the modem footprint, while half-duplex operation supports fieldbus communications over shared wiring. In a gateway, host firmware would manage protocol configuration, diagnostics, and data mapping. Exact interface levels, bandwidth, and network-component requirements remain to be confirmed from the full datasheet.
推薦
推薦產品摘要
工程參考資料，適用於 DAC8742HPBSR — 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 | DAC8742HPBS |
|---|---|---|
| Brand | Texas Instruments | Texas Instruments |
| Package | 32-pin TQFP (5 mm × 5 mm) | 32-pin TQFP (5 mm × 5 mm) |
| Product Type | Integrated HART and fieldbus modem | Integrated HART and fieldbus modem |
| Protocol Support | HART, FOUNDATION Fieldbus, PROFIBUS PA | HART, FOUNDATION Fieldbus, PROFIBUS PA |
| Host Interface | UART and SPI | UART and SPI |
| HART Mode | Half-duplex master or slave | Half-duplex master or slave |
主要差異化特點
- Single integrated modem supports three industrial protocol families (對比Generic UART-only interface ICs)
- Supports both master and slave field roles (對比Slave-only HART modem implementations)
- Offers two host-control options (對比UART-only HART modems)
設計說明
Treat the 32-pin TQFP as a high-density mixed-signal layout problem. Use a solid, low-impedance ground plane, minimize loop area around supply and modem pins, and place required bypass capacitors directly beside their corresponding terminals. The supplied excerpts do not specify capacitor values, so use the Texas Instruments DAC8742H datasheet and reference circuit rather than generic values. Confirm land pattern, thermal pad treatment, and assembly constraints against the official package drawing before release.
Separate modem-side routing from UART, SPI, and clock signals to reduce coupling into the sensitive analog communication path. Keep traces short, avoid routing communications nets beneath noisy switching nodes, and use a continuous ground reference for return currents. The verified data states that minimal external filtering components are required, but it does not identify their topology or values; preserve the manufacturer-recommended network and verify signal integrity with representative fieldbus loading.
Budget the supply network from the complete electrical specifications rather than assuming the low-power label defines a single current value. Confirm operating and absolute-maximum voltages, quiescent current, load current, and power dissipation in the DAC8742H datasheet. The supplied excerpts omit those ratings. After verification, include local bypass capacitance, controlled startup behavior, and protection appropriate to the installation environment, while checking that the 5 mm × 5 mm TQFP thermal performance remains acceptable at the maximum ambient temperature.
Do not infer suffix interchangeability or pin compatibility from the family name alone. DAC8742HPBS and DAC8742HPBSR both appeared in the verified search results, but their orderable-table differences were not supplied. Compare package, temperature grade, and full suffix definitions before substituting either part. Likewise, the DAC8734SPFBR comparison page is not evidence of drop-in equivalence; verify terminal assignments, ratings, and protocol behavior directly against each manufacturer datasheet.
合規資訊
The supplied verified excerpts do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status for DAC8742HPBSR. These fields remain unknown rather than assumed.
