DAC8740HRGER - Low-Power Fieldbus Modem | Texas Instruments
料号： DAC8740HRGER ✗ 停产| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $4.7661 | $4.77 |
| 10 | $4.7661 | $47.66 |
| 100 | $4.7661 | $476.61 |
| 500 | $4.7661 | $2,383.05 |
| 1,000 | $4.7661 | $4,766.10 |
DAC8740HRGER 概述
A fieldbus modem is an interface IC that converts digital UART information into the physical signaling required by an industrial fieldbus, and it can also receive and decode the corresponding bus waveform. In the HART mode described by Texas Instruments, the DAC8740H integrates the circuitry required for half-duplex HART physical-layer operation in slave or master configurations, reducing the amount of external circuitry needed by the transmitter. FOUNDATION Fieldbus and PROFIBUS PA compatibility broadens its relevance in process plants and industrial automation networks.
The verified product data establishes the 24-VQFN 4 x 4 mm package and the UART-based architecture, but it does not provide a complete electrical parameter table in the supplied excerpts. Consequently, operating voltage, current consumption, baud rate, analog performance, temperature range, and protection limits are retained as datasheet-needed fields rather than inferred from the product family name. This conservative approach prevents protocol, supply, and signal-integrity assumptions from entering a design prematurely.
The DAC8740HRGER is positioned for industrial measurement and control rather than ordinary consumer UART links. Its fieldbus compatibility is relevant when a controller must communicate with a 2-wire industrial process network through a defined physical layer. The UART interface gives the host processor a familiar digital connection, while the integrated modem circuitry reduces the design burden associated with waveform generation, reception, filtering, and bus coupling. Exact baud-rate and loading requirements should be checked against the complete manufacturer documentation before schematic release.
Typical application areas include HART-connected pressure and temperature transmitters, FOUNDATION Fieldbus process instruments, PROFIBUS PA field devices, industrial controllers, sensor gateways, actuator interfaces, and factory automation equipment. The compact VQFN package helps reduce board area compared with larger leaded implementations, although exposed-pad layout, thermal performance, grounding, and high-speed signal routing must be handled according to the manufacturer's land pattern and layout guidance.
The most important design step is to select the external network components and protection scheme around the exact bus topology, cable length, and operating mode. Fieldbus transceivers are exposed to industrial transients and long cables, so power-supply filtering, surge protection, grounding, connector design, and separation from noisy switching nodes deserve careful review. Verify pin-level multiplexing, supply sequencing, decoupling, and exposed-pad connections against the complete datasheet before layout sign-off.
This page combines the verified manufacturer identity, protocol positioning, package information, distributor references, and engineering cautions. It is intended to help engineers locate the correct device, understand its industrial interface role, and identify which datasheet parameters still require confirmation before a production design is released.
直接替换替代料： DAC8740HRGER ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
DAC8771RGZR
✅ 直接替换📋 参考替代料（不在目录中）
DAC8734SRHAR
✅ 直接替换📋 参考替代料（不在目录中）
MAX3107
✅ 直接替换📋 参考替代料（不在目录中）
DAC8740HRGER 最大额定值与电气特性
| Device Type | Low-power fieldbus modem |
| Supported Protocol Families | HART, FOUNDATION Fieldbus, PROFIBUS PA |
| Host Interface | UART |
| HART Physical-Layer Mode | Half-duplex |
| HART Configuration | Slave or master |
| 封装 | 24-VQFN, 4 x 4 mm |
| 安装类型 | Surface mount |
| External Component Count | Minimal external components, quantity not supplied |
| RoHS 状态 | unknown |
| REACH Status | unknown |
DAC8740HRGER 24-vqfn, 4 x 4 mm 引脚配置指南
DAC8740HRGER（24-vqfn, 4 x 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： DAC8740HRGER.
请参阅 数据手册 以查看完整引脚配置。
典型应用
DAC8740HRGER 适用于 6 应用s: HART Pressure Transmitter, FOUNDATION Fieldbus Instrument, PROFIBUS PA Field Device, Industrial Sensor Gateway, Process Actuator Controller, Factory Automation Test Fixture.
HART Pressure Transmitter
The DAC8740HRGER is a logical fit for a HART pressure or temperature transmitter because Texas Instruments describes the DAC8740H as a half-duplex HART physical-layer modem usable in slave or master configurations. Place the modem between the transmitter signal-conditioning electronics and the host UART, then use the manufacturer's recommended external network and filtering components. The protocol integration can reduce the amount of custom physical-layer circuitry while supporting an established industrial bus. Verify exact baud rate, signal levels, supply range, and external component values from the complete datasheet before freezing the schematic.
推荐
FOUNDATION Fieldbus Instrument
For a FOUNDATION Fieldbus instrument, the DAC8740HRGER provides a field-oriented interface alongside its UART host connection. The manufacturer positions the DAC8740H family for industrial process-control and automation applications, making it relevant to transmitters and controllers that must connect through an industrial fieldbus rather than a generic serial link. The integration can simplify host-to-fieldbus signal conversion, but cable termination, protection, grounding, and device-level compliance must be checked against the complete electrical specifications and reference circuit.
推荐
PROFIBUS PA Field Device
The verified Texas Instruments product positioning identifies PROFIBUS PA compatibility, making the DAC8740HRGER relevant to a PROFIBUS PA field device or controller interface. Its UART side can connect to an embedded host, while the modem handles the industrial physical layer. The compact 24-VQFN 4 x 4 mm package helps reduce board area in compact transmitters, but exposed-pad thermal design, supply decoupling, bus protection, and exact device-level operating requirements remain essential design tasks. Confirm pin multiplexing and timing in the manufacturer documentation.
推荐
Industrial Sensor Gateway
In an industrial sensor gateway, the DAC8740HRGER can provide the fieldbus-facing side of a conversion between an embedded controller and process instrumentation. The UART interface allows the host processor to exchange commands or measurements while the integrated modem handles the physical-layer task associated with HART or another supported fieldbus protocol. This architecture is useful when a gateway must add modern processing without redesigning the field connection. Power-budget, ground, surge, and cable-length analysis should be completed before deployment in an industrial enclosure.
推荐
Process Actuator Controller
The DAC8740HRGER can fit the communications path of a process actuator controller when the controller must maintain an industrial fieldbus connection while receiving commands from a local processor. The manufacturer describes the family as low-power and intended for industrial process control, with half-duplex HART operation available in master or slave configurations. That combination supports compact control electronics, although the design must account for actuator drive noise, isolated power, bus transients, and the exact timing and output-level requirements of the selected protocol.
推荐
Factory Automation Test Fixture
A factory automation test fixture may use the DAC8740HRGER to emulate or monitor the communications behavior of an industrial fieldbus device. Its UART interface provides a convenient host-side control path, while its integrated HART, FOUNDATION Fieldbus, and PROFIBUS PA positioning supports protocol-oriented testing. The same device can therefore simplify a fixture that must exercise multiple industrial communication requirements. The test engineer still needs to verify supply sequencing, signal termination, cable simulation, fault injection, and whether the package's exposed pad meets the fixture's thermal conditions.
推荐
推荐产品汇总
工程参考数据： DAC8740HRGER ——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 | DAC8771RGZR | DAC8734SRHAR | MAX3107 |
|---|---|---|---|---|
| Brand | Texas Instruments | Texas Instruments | Texas Instruments | Maxim Integrated |
| Package | 24-VQFN 4 x 4 mm | 24-VQFN 4 x 4 mm candidate; exact package verification required | 24-VQFN 4 x 4 mm candidate; exact package verification required | 24-VQFN candidate; exact package verification required |
关键差异点
- Integrated industrial fieldbus protocol support （对比 MAX3107)
- HART master or slave operation （对比 DAC8771RGZR)
- Dedicated process-control positioning （对比 DAC8734SRHAR)
设计说明
Use the manufacturer land pattern and verify all 24 VQFN pin assignments, including the exposed pad, before routing. The supplied data does not include the complete pinout, so do not infer connections from the protocol name. Keep UART traces short, provide local supply decoupling, and maintain a continuous return path beneath the device where the package guidance permits.
Treat the fieldbus connection as an industrial physical-layer interface rather than a generic UART trace. Route the bus-related nets according to the manufacturer reference design, keep sensitive analog or receive paths away from switching nodes, and validate termination, filtering, and protection against the target cable and topology. Exact values are [DATA_NEEDED: fieldbus network components and routing values].
Do not assume that a similarly packaged UART or transceiver IC is a functional replacement. The verified data does not establish identical pin functions, protocol support, signal levels, supply limits, or timing for the listed candidates. Before substitution, compare the official datasheets, exposed-pad requirements, fieldbus compliance, and reference circuits; also add industrial transient protection appropriate to the installation.
The 24-VQFN 4 x 4 mm package requires attention to exposed-pad copper and thermal via layout. The actual dissipation depends on supply voltage, operating mode, protocol activity, and ambient conditions, none of which are fully specified in the supplied excerpts. Measure or estimate junction temperature using the manufacturer thermal model and verify the final board under worst-case industrial conditions.
合规信息
The supplied search excerpts do not provide verified compliance statements. Protocol names and industrial positioning do not establish RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.
