DAC8742HPBS - HART Modem Interface | Texas Instruments
부품 번호: DAC8742HPBS ✓ 활성| 수량 | 단가 | 합계 |
|---|---|---|
| 1 | $7.9092 | $7.91 |
| 10 | $7.9092 | $79.09 |
| 100 | $7.9092 | $790.92 |
| 500 | $7.9092 | $3,954.60 |
| 1,000 | $7.9092 | $7,909.20 |
DAC8742HPBS 개요
A HART modem interface is a signal-conditioning IC within the broader industrial communication and data-conversion hierarchy. It encodes and decodes Frequency Shift Keying signals used by HART-compatible fieldbus equipment. This allows an embedded controller to communicate over legacy 4-20 mA instrumentation loops without implementing the analog modulation and filtering as discrete circuitry. In a FOUNDATION Fieldbus or PROFIBUS PA installation, the modem interface supports the physical signaling layer while higher-level protocols and safety mechanisms remain the responsibility of the host system.
The DAC8742HPBS is valued for integrating dedicated modem functionality into a compact 32-TQFP device. Its UART and SPI host interfaces provide selectable connectivity to embedded processors, allowing command and data transfer between the modem and application firmware. The 5x5 mm package also supports space-constrained industrial instrumentation, although exposed-pad layout and thermal verification must follow the manufacturer package drawing. Because the supplied data does not expose individual pin assignments, supply limits, isolation ratings, or accuracy figures, those details must be checked in the official DAC8742H documentation before schematic approval.
Typical uses include HART-compatible sensor transmitters, pressure and flow instrument interfaces, industrial process-control modules, and FOUNDATION Fieldbus or PROFIBUS PA equipment. In these systems, the DAC8742HPBS reduces the discrete component count associated with analog modem circuitry and gives the host MCU a structured digital control path. The principal engineering trade-off is that the modem interface is only one part of the communication chain: the transmitter still requires suitable loop power, filtering, surge protection, grounding, and validated fieldbus wiring.
For new designs, verify the exact device variant, supply rails, UART and SPI logic levels, receive bandwidth, transmit modulation limits, loop-current interface, and exposed-pad requirements in the official Texas Instruments datasheet. Do not derive those values from the distributor snippets. The manufacturer product page describes the DAC8742H as HART, FOUNDATION Fieldbus, and PROFIBUS PA compliant with UART/SPI support, making it the authoritative starting point for design review.
This page combines verified distributor availability, manufacturer positioning, package information, replacement analysis, and practical integration guidance. It also separates confirmed facts from parameters that require datasheet verification, helping engineers avoid treating incomplete distributor metadata as a complete electrical specification.
드롭인 대체품: DAC8742HPBS — 동일 패키지, 핀 호환. PCB 재작업이 필요한 다른 패키지 부품은 제외됩니다.
이 시리즈의 변형
다음과 드롭인 호환되는 동일 시리즈 모델: DAC8742HPBS (동일 폼 팩터 및 풋프린트) — 차이점: Host Interface, Product Type.
빠른 비교 도구 — 나란히 비교할 대체 부품을 선택하십시오:
DAC8742HPBSR
✅ 드롭인✓ 재고 있음
$9.2982 / 개
데이터시트 보기 →DAC8718SPAGR
✅ 드롭인📋 참조 대체품 (카탈로그에 없음)
DAC8742HPBS 최대 정격 & 전기적 특성
| Product Type | HART modem interface |
| Supported Standards | HART, FOUNDATION Fieldbus, PROFIBUS PA |
| Host Interface | UART/SPI |
| Package Type | 32-TQFP (5x5) |
| Package Pin Count | 32 pins |
| Package Body Size | 5 x 5 mm |
| Manufacturer | Texas Instruments |
| Product Family | DAC874xH |
| Signal Type | HART modem signal |
| 실장 유형 | Surface mount |
| Application Category | Industrial fieldbus communication |
| Distributor Availability | Buy now, ships today |
| Reference Unit Price | $7.9092 |
| Reference Inventory | 6,016 pieces |
| Reference Lead Time | To be confirmed |
| Estimated Delivery Time | Oct 18 - Oct 23 |
DAC8742HPBS 5 x 5 mm 핀 구성 가이드
DAC8742HPBS(5 x 5 mm 패키지)의 핀 구성입니다. 이 아날로그 부품에는 입력, 출력, 전원 공급 핀이 있습니다. 오프셋 널, 보상, 인에이블 핀 구성은 제조사 데이터시트를 참조하십시오. 신호 컨디셔닝 및 증폭기 회로에 이상적입니다.
다음에 대한 상세 핀아웃 데이터 없음: DAC8742HPBS.
다음을 참조하십시오: 데이터시트 전체 핀 구성은 다음을 참조하십시오.
일반적인 애플리케이션
DAC8742HPBS 적합 용도: 6 애플리케이션s: HART Sensor Transmitter, Pressure and Flow Instrumentation, FOUNDATION Fieldbus Equipment, PROFIBUS PA Device Interface, Industrial Process-Control Module, Remote Data Acquisition Unit.
HART Sensor Transmitter
The DAC8742HPBS is suited to a HART sensor transmitter because the Texas Instruments DAC8742H family combines a dedicated HART modem interface with selectable UART or SPI host connectivity. A microcontroller can configure and supervise the modem while the interface couples the digital command path to the 4-20 mA instrumentation loop. The 32-TQFP (5x5) package supports compact transmitter boards. Verify supply rails, signal amplitudes, bandwidth, and exposed-pad layout in the official datasheet before schematic release.
추천
Pressure and Flow Instrumentation
For pressure, level, and flow instruments, the DAC8742HPBS can provide the HART physical-layer interface between a measurement controller and a 4-20 mA loop. UART or SPI support simplifies connection to embedded processing hardware, while the 5x5 mm TQFP package limits board area compared with discrete codec implementations. The interface does not remove the need for sensor excitation, signal conditioning, loop compliance, or surge protection, so those blocks must be designed independently.
추천
FOUNDATION Fieldbus Equipment
The DAC8742HPBS fits FOUNDATION Fieldbus equipment because the manufacturer identifies the DAC8742H family as HART, FOUNDATION Fieldbus, and PROFIBUS PA compliant. It can provide the dedicated modem interface while a host processor handles higher-layer communication, configuration, diagnostics, and device data. Its UART/SPI host connectivity supports a modular embedded architecture. Detailed bus timing, signal levels, and isolation requirements must be confirmed from the exact device documentation before implementation.
추천
PROFIBUS PA Device Interface
In a PROFIBUS PA instrument, the DAC8742HPBS can serve as the dedicated HART-compatible modem interface associated with the DAC8742H family, while system firmware manages the application and network layers. UART or SPI host communication allows connection to an embedded processor without implementing analog modulation in discrete logic. The 32-TQFP (5x5) package supports compact field devices, but loop impedance, cable length, EMC behavior, and grounding remain system-level constraints.
추천
Industrial Process-Control Module
The DAC8742HPBS is applicable to a process-control module that must add HART-compatible communication to an existing embedded control platform. Its UART/SPI host options let the modem interface connect to a microcontroller while diagnostics and configuration data remain software-managed. The 5x5 mm TQFP package is useful for compact multi-channel equipment, but thermal performance and exposed-pad construction must follow the manufacturer land pattern. External loop and surge-protection components should be selected for the installation environment.
추천
Remote Data Acquisition Unit
A remote data-acquisition unit can use the DAC8742HPBS to add HART modem communication to a controller connected to sensors and actuators. The manufacturer-confirmed HART, FOUNDATION Fieldbus, and PROFIBUS PA positioning supports industrial communication designs, while UART/SPI simplifies firmware integration with embedded processors. The modem interface reduces custom analog-interface complexity, although input filtering, isolated power, cable protection, and precise operating-limit verification remain essential.
추천
추천 제품 요약
엔지니어링 참조 데이터: DAC8742HPBS — 비교, 설계 지침 및 규정 준수 정보.
선택 가이드
대체품과의 비교
| 파라미터 | 이 제품 | DAC8742HPBSR | DAC8718SPAGR |
|---|---|---|---|
| Package | 32-TQFP (5x5) | 32-TQFP (5x5) - related variant, exact package drawing requires verification | 32-TQFP (5x5) - same stated package family |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Product Function | HART modem interface | Related DAC8742H-family variant; exact function not verified | Modem-interface comparison candidate; exact function not verified |
| Package Pin Count | 32 pins | 32 pins - exact pinout requires verification | 32 pins - exact pinout requires verification |
| Manufacturer | Texas Instruments | Texas Instruments | Texas Instruments |
| Drop-In Confidence | Reference device | 70% - related suffix variant requiring manufacturer confirmation | 70% - same package family but functional equivalence unverified |
주요 차별점
- Dedicated industrial modem positioning (vs DAC8718SPAGR)
- Confirmed UART and SPI host connectivity (vs DAC8742HPBSR)
- Documented distributor availability (vs DAC8742HPBSR)
설계 노트
Use the exact Texas Instruments DAC8742H package drawing for the 32-TQFP (5x5) footprint rather than relying on a generic TQFP land pattern. Verify pin 1 orientation, pin numbering, exposed-pad dimensions, paste geometry, and via recommendations. The supplied distributor excerpt confirms the package but does not expose the pin table, so schematic-to-footprint cross-checking is mandatory before PCB release.
Confirm the device's permitted supply range, sequencing, digital input thresholds, and analog signal limits from the exact datasheet before assigning power rails. Decouple each required supply according to the manufacturer recommendation and include local high-frequency bypass close to the pins. The supplied records do not state voltage ratings, so do not infer them from the 4-20 mA loop or UART/SPI labels.
Treat the HART connection as an analog communications channel rather than a conventional UART signal path. Follow the manufacturer reference circuit for coupling, filtering, impedance, grounding, and protection. Keep noisy switching and relay paths away from the modem input, and validate signal integrity with the intended cable and termination. The supplied data does not provide cutoff frequencies or drive levels.
Do not substitute DAC8742HPBSR or DAC8718SPAGR based only on a matching 32-pin TQFP description. Confirm that every assigned pin has the same function and that supply, timing, electrical limits, and thermal requirements are compatible. Also verify the HART variant and package suffix against the manufacturer ordering table, because the supplied comparison search does not establish true pin-to-pin interchangeability.
규정 준수 정보
The supplied verified records do not contain explicit compliance declarations for the exact DAC8742HPBS orderable part. Obtain current manufacturer compliance documentation before release.
