DAC8740HRGET - 2.7V-5.5V HART/Fieldbus Modem | TI
料号： DAC8740HRGET ✓ 量产中DAC8740HRGET 概述
A HART modem is the physical-layer interface used to superimpose digital communication signals on 4–20 mA analog instrumentation circuits. A FOUNDATION Fieldbus or PROFIBUS PA interface similarly combines process communication with power delivery over an industrial fieldbus. These interfaces allow sensors, transmitters, controllers, and other field devices to exchange data over the same wiring infrastructure used for measurement and actuation.
The DAC8740HRGET provides a compact 2.7 V to 5.5 V operating supply range for integration into modern industrial electronics. Its half-duplex operating arrangement supports both master and slave configurations, while its integrated modem functionality is intended to reduce board area and external circuitry. The VQFN-24 4 mm × 4 mm package also supports compact transmitter and receiver designs where PCB space is constrained.
The DAC8740H family was created for industrial process-control and industrial-automation applications requiring interoperable fieldbus connectivity. In HART mode, the integrated circuitry is intended to perform the required half-duplex physical-layer functions with minimal external components. This makes the device applicable to transmitter boards, sensor interfaces, communication controllers, data-acquisition equipment, and connected process-control modules.
Typical uses include 4–20 mA HART transmitters, FOUNDATION Fieldbus host and field equipment, PROFIBUS PA measurement devices, industrial sensor gateways, process-monitoring instruments, and factory automation controllers. Designers should verify the exact electrical limits, communication timing, external component requirements, and thermal limits against the manufacturer datasheet before finalizing a production design.
A critical design consideration is selecting the correct fieldbus termination, coupling, protection, and decoupling network. The 2.7 V to 5.5 V supply range must remain valid under transient conditions, and exposed industrial connections may require surge and ESD protection beyond the modem's core communications function. Layout should keep sensitive analog and modem nodes away from high-current switching paths.
This product page combines verified distributor pricing, package information, family capabilities, source links, and drop-in replacement analysis with practical industrial-interface design guidance. It distinguishes verified alternatives from broader functional equivalents so engineers can assess PCB replacement risk before committing to a redesign.
直接替换替代料： DAC8740HRGET ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： DAC8740HRGET （相同外形与封装尺寸） ——差异在于 HART Configuration, Host Interface, Operating Mode, Package, Product Type.
DAC8740HRGER
✅ 直接替换联系询价
查看数据手册 →DAC8740HRGET 最大额定值与电气特性
| Product Type | HART, FOUNDATION Fieldbus, and PROFIBUS PA modem |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Operating Mode | Half-duplex HART mode |
| HART Configuration | Master or slave configuration |
| Fieldbus Compatibility | HART, FOUNDATION Fieldbus, and PROFIBUS PA |
| Power Class | Low-power industrial modem |
| Package Type | 24-pin VQFN |
| Package Dimensions | 4 mm × 4 mm |
| 安装类型 | Surface mount |
| External Component Requirement | Minimal external components in HART mode |
| Application Category | Industrial process control and industrial automation |
DAC8740HRGET 4 mm × 4 mm 引脚配置指南
DAC8740HRGET（4 mm × 4 mm 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： DAC8740HRGET.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DAC8740HRGET 适用于 6 应用s: 4–20 mA HART Sensor Transmitter, FOUNDATION Fieldbus Instrument Interface, PROFIBUS PA Measurement Device, Industrial Process-Monitoring Gateway, Factory-Automation Sensor Interface, Connected Transmitter and Controller Module.
4–20 mA HART Sensor Transmitter
The DAC8740HRGET fits a compact 4–20 mA HART transmitter because it integrates the required half-duplex modem physical layer and supports both master and slave configurations. Its 2.7 V to 5.5 V supply range can serve low-voltage industrial signal-conditioning equipment without requiring a high-voltage modem supply directly at the IC. The implementation still needs the correct analog measurement chain, current regulator, coupling and filtering network, field-bus protection, and reference circuitry. Following the manufacturer application circuit is important because the modem communicates by superimposing a signal on the measurement current.
推荐
FOUNDATION Fieldbus Instrument Interface
The DAC8740HRGET is applicable to FOUNDATION Fieldbus instrument interfaces because the DAC874xH family combines HART, FOUNDATION Fieldbus, and PROFIBUS PA support in one low-power modem IC. A field-mounted pressure, temperature, flow, or level instrument can use the integrated half-duplex physical layer to communicate over industrial fieldbus wiring while retaining a compact 24-pin VQFN footprint. Designers must confirm the exact fieldbus electrical layer, transformer or coupling requirements, termination behavior, surge protection, and supply isolation outside the modem itself.
推荐
PROFIBUS PA Measurement Device
The DAC8740HRGET can support a PROFIBUS PA measurement device when the system requires a compact single-chip modem with a 2.7 V to 5.5 V operating range. Its low-power design and integrated half-duplex physical-layer circuitry suit industrial measurement equipment that must communicate process data over fieldbus wiring. The modem does not replace the complete PROFIBUS PA interface network, so designers still need to implement the specified line coupling, protection, grounding, and power-distribution arrangements and verify EMC performance in the finished instrument.
推荐
Industrial Process-Monitoring Gateway
The DAC8740HRGET is useful in an industrial process-monitoring gateway that must interface with HART, FOUNDATION Fieldbus, or PROFIBUS PA equipment while minimizing PCB area. Its 4 mm × 4 mm VQFN-24 package leaves more board space for isolation, protection, data processing, and communications circuitry. Because the supported protocols may require different external networks and operating modes, the gateway design should use the protocol-specific reference implementation. The 2.7 V to 5.5 V supply range also requires careful local regulation to remain within limits during industrial transients.
推荐
Factory-Automation Sensor Interface
The DAC8740HRGET fits factory-automation sensor interfaces that need bidirectional digital communication over an analog or fieldbus connection. Its half-duplex operation can support both master and slave HART configurations, allowing the same modem family to serve controllers and field devices when the surrounding circuit is configured correctly. The low-power 2.7 V to 5.5 V supply range and compact VQFN-24 package help reduce board-space requirements. Production designs must add suitable surge and ESD protection for factory wiring and verify operation across the intended temperature range.
推荐
Connected Transmitter and Controller Module
The DAC8740HRGET is suitable for connected transmitter and controller modules that combine local measurement or actuation with HART, FOUNDATION Fieldbus, or PROFIBUS PA communication. The integrated modem reduces the need for a separate physical-layer implementation, while half-duplex master or slave support broadens its use in connected industrial equipment. Designers should allocate PCB area for external filtering, coupling, protection, and isolation components identified by the manufacturer reference design. The compact 24-pin VQFN package also simplifies fanout and allows smaller field-device enclosures without assuming that the modem eliminates external protection.
推荐
推荐产品汇总
工程参考数据： DAC8740HRGET ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | DAC8740HRGER |
|---|---|---|
| Package | VQFN-24 (4 mm × 4 mm) | VQFN-24 (4 mm × 4 mm) - same |
| Brand | Texas Instruments | Texas Instruments |
关键差异点
- Multi-protocol fieldbus integration （对比 DAC8740HRGER)
- Configurable HART operating role （对比 DAC8740HRGER)
- Compact low-voltage integration （对比 DAC8740HRGER)
设计说明
Use the manufacturer reference layout as the starting point for the DAC8740HRGET. Keep the 24-pin VQFN footprint, exposed-pad connection, component placement, and trace geometry consistent with the official package data. Route sensitive modem and analog nodes away from switching power nodes and high-current fieldbus paths. Verify the thermal-via arrangement against the package drawing because the supplied data does not provide a complete exposed-pad land pattern or maximum junction temperature.
Design the local supply network so the DAC8740HRGET always remains within its verified 2.7 V to 5.5 V operating range. Place the manufacturer-specified bypass capacitors close to the relevant supply pins and account for voltage drop, startup behavior, and load transients. Industrial wiring can introduce large disturbances, so determine whether the product design needs additional filtering, surge suppression, isolation, or a wider supply arrangement outside the modem IC.
Do not treat a matching VQFN outline as proof that any substitute is automatically interchangeable. Before using DAC8740HRGER in place of DAC8740HRGET, compare the complete ordering table, pin names, electrical limits, temperature range, exposed-pad requirements, and protocol support. The supplied evidence establishes the same package dimensions but does not include every alternative datasheet value. Prototype and validate communications, EMC behavior, and supply tolerance before production substitution.
合规信息
The supplied verified snippets do not explicitly state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification status for DAC8740HRGET. AEC-Q100 is not applicable because no automotive qualification was identified.
