DAC8742HPBS - HART Modem Interface | Texas Instruments
Référence : DAC8742HPBS ✓ Actif| Qté | Prix unitaire | Total |
|---|---|---|
| 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 Présentation
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.
Alternatives de remplacement direct pour DAC8742HPBS — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Variantes de cette série
Modèles de la même série directement compatibles avec DAC8742HPBS (même facteur de forme et même empreinte) — différant par Host Interface, Product Type.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
DAC8742HPBSR
✅ Remplacement direct✓ En stock
$9.2982 / unité
Voir la fiche technique →DAC8718SPAGR
✅ Remplacement direct📋 Alternative de référence (hors catalogue)
DAC8742HPBS Valeurs maximales et caractéristiques électriques
| 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 |
| Type de montage | 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 |
Guide de configuration des broches du DAC8742HPBS 5 x 5 mm
Configuration des broches du DAC8742HPBS (boîtier 5 x 5 mm). Ce composant analogique comporte des broches d'entrée, de sortie et d'alimentation. Consultez la fiche technique du fabricant pour les configurations des broches d'annulation d'offset, de compensation et d'activation. Idéal pour le conditionnement de signaux et les circuits amplificateurs.
Aucune donnée de brochage détaillée disponible pour DAC8742HPBS.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
DAC8742HPBS convient pour 6 applications: 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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
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.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour DAC8742HPBS — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | 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 |
Principaux différenciateurs
- Dedicated industrial modem positioning (vs DAC8718SPAGR)
- Confirmed UART and SPI host connectivity (vs DAC8742HPBSR)
- Documented distributor availability (vs DAC8742HPBSR)
Notes de conception
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.
Informations de conformité
The supplied verified records do not contain explicit compliance declarations for the exact DAC8742HPBS orderable part. Obtain current manufacturer compliance documentation before release.
