AS3991-BQFT - UHF RFID Single Chip Reader 840-960MHz | ams
N.º de pieza: AS3991-BQFT ✓ Activo| Cant. | Precio unitario | Total |
|---|---|---|
| 1 | $6.2 | $6,20 |
| 10 | $5.58 | $55,80 |
| 100 | $4.96 | $496,00 |
| 500 | $4.45 | $2.225,00 |
| 1.000 | $3.98 | $3.980,00 |
AS3991-BQFT Descripción general
A UHF RFID reader chip is the radio-side heart of an RFID interrogator: it generates the 860-960 MHz carrier, amplifies and transmits interrogator commands, receives the weak backscatter signal from passive tags, and demodulates it into digital data. In the system hierarchy, it sits below complete RFID reader modules and above discrete RF building blocks, combining PA driver, low-noise receiver, PLL synthesizer, and protocol engine in one semiconductor device.
Key features include read/write support for ISO 18000-6C tags, a wide 840-960 MHz frequency range covering all regional UHF RFID bands (ETSI 865-868 MHz, FCC 902-928 MHz, and Asian bands), built-in programming options for protocol parameters, and lead-free, RoHS-compliant construction. The integrated protocol handler offloads dense tag-population work such as Q-algorithm anti-collision from the host processor.
Technically, the AS3990/AS3991 family integrates the complete analog transmit and receive chain with a flexible digital interface so an external microcontroller only manages higher-level inventory logic. The AS3991 variant adds enhanced system integration options over the AS3990 within the same 64-QFN footprint, enabling shared PCB design across the family.
Typical applications include fixed UHF RFID portals and gates for warehouse logistics, handheld and portable RFID readers, and industrial asset-tracking systems where EPC Gen 2 compliance and multi-regional frequency coverage are mandatory.
Design-wise, the exposed pad of the 64-VFQFN must be soldered to a solid RF ground plane, and the PA output matching network must be tuned for the target regional band to maximize read range and meet regulatory emission masks.
This page synthesizes distributor sourcing data, drop-in same-family alternatives, and practical design notes not found in a single manufacturer document.
Alternativas directas para AS3991-BQFT — mismo encapsulado, compatible pin a pin. Se excluyen las piezas de otro encapsulado que requieren retrabajo de la PCB.
Herramienta de comparación rápida — seleccione piezas alternativas para compararlas lado a lado:
AS3990-BQFT
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AS3991-BQFT-33
✅ Sustitución directa📋 Alternativa de referencia (no en el catálogo)
AS3990-BQFT-33
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AS3992-BQFT
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AS3990-BQFM
✅ Sustitución directa ⚠️ Especificaciones sin verificar📋 Alternativa de referencia (no en el catálogo)
AS3991-BQFT Especificaciones
| Función | UHF RFID Single Chip Reader (Read/Write) |
| Protocol | EPC Class 1 Gen 2 / ISO 18000-6C |
| Frequency Range | 840 MHz to 960 MHz |
| Encapsulado | 64-VFQFN with Exposed Pad |
| Tipo de montaje | SMD/SMT |
| Packaging | Tape & Reel (TR) |
| Series | AS3990/AS3991 |
| Lead Free Status | Lead Free |
| Estado RoHS | Compliant |
| RF Type | Read / Write |
Guía de configuración de pines de AS3991-BQFT 64-vfqfn with exposed pad
Configuración de pines para AS3991-BQFT (encapsulado 64-vfqfn with exposed pad). La numeración de pines, las funciones y los diagramas de conexión se definen en la hoja de datos del fabricante. Consúltela para conocer el footprint exacto y las directrices de soldadura.
No hay datos detallados de patillaje disponibles para AS3991-BQFT.
Consulte la hoja de datos para ver la configuración completa de patillas.
Aplicaciones típicas
AS3991-BQFT es adecuado para 6 aplicacións: Warehouse RFID Portals and Gates, Handheld and Portable RFID Readers, Industrial Asset Tracking Systems, Access Control and Vehicle Identification, RFID Printer-Encoders, Smart Retail and IoT Checkout Systems.
Warehouse RFID Portals and Gates
Fixed UHF RFID portal readers at dock doors and chokepoints are the classic use case for the AS3991-BQFT. Its full EPC Class 1 Gen 2 protocol handling with built-in anti-collision programming options lets one chip drive dense tag populations on pallets passing through a portal, offloading the Q-algorithm inventory procedure from the host MCU. Operating across 840-960 MHz means the same reader PCB can be certified for ETSI 865-868 MHz in Europe and FCC 902-928 MHz in North America by changing synthesizer settings and antenna tuning. Because the chip integrates the analog front end, the design achieves higher receive sensitivity than discrete implementations, directly translating to larger portal read zones and fewer missed tags at conveyor speeds.
Recomendado
Handheld and Portable RFID Readers
Battery-powered handheld UHF RFID readers benefit from the AS3991-BQFT's single-chip integration, which shrinks the RF section to one IC plus a matching network and antenna, saving board area critical in gun-grip form factors. The chip-level approach lets designers optimize transmit power dynamically, extending battery life by transmitting only the minimum power needed for the target read range, typically 1-3 m for handheld inventory scanning. Its ISO 18000-6C compliance ensures interoperability with the passive tag ecosystem used in retail, healthcare, and logistics. The exposed-pad 64-VFQFN provides good thermal relief for the PA during burst transmissions, and the integrated receiver demodulates backscatter directly, avoiding bulky discrete downconversion stages that would increase handheld weight and cost.
Recomendado
Industrial Asset Tracking Systems
In factories tracking tools, containers, and work-in-progress, the AS3991-BQFT provides rugged EPC Gen 2 readability on metal-mounted and dense-tag environments where barcode fails. Its 840-960 MHz coverage supports deployments across global manufacturing footprints without redesigning the reader board, only reconfiguring regional band settings and antenna matching. The chip's built-in programming options allow firmware tuning of link frequency, Miller encoding, and Q values to optimize reads in reflective industrial RF environments full of metal racking. Integrating protocol handling in silicon gives deterministic timing for trigger-synchronized reads on moving assets, and the RoHS-compliant, lead-free construction fits industrial environmental requirements for equipment sold in the EU and similar regulated markets.
Recomendado
Access Control and Vehicle Identification
UHF access control readers for parking gates, fleet yards, and building entrances exploit the multi-meter read range achievable with the AS3991-BQFT at regulated transmit power. Windshield-tag identification at drive-through speeds requires fast, reliable EPC Gen 2 sessions; the chip's hardware protocol engine delivers deterministic tag singulation without burdening the host processor, enabling read decisions within the sub-second windows of passing vehicles. The wide 840-960 MHz band allows one reader design to serve North American, European, and Asian installations, simplifying the product line for security equipment vendors. The exposed-pad QFN thermally couples the PA bursts to the ground plane, supporting the higher duty cycles typical of always-on entrance readers compared with occasional handheld use.
Recomendado
RFID Printer-Encoders
Smart label printers that encode embedded UHF inlays need a compact, protocol-complete reader engine; the AS3991-BQFT fits this role by combining the analog front end and ISO 18000-6C protocol stack on one chip adjacent to the print head assembly. The chip verifies tag encoding immediately after writing, using its read capability to confirm EPC data integrity before the label exits the printer, which prevents mislabeled shipments. Its built-in programming options let printer firmware adjust RF parameters per inlay vendor, since passive tag chips vary in sensitivity across the 860-960 MHz range. Because the printer must certify for multiple regions, the single-board multi-band capability of the AS3991 reduces the number of hardware variants the printer OEM must qualify and stock.
Recomendado
Smart Retail and IoT Checkout Systems
Retail applications such as smart fitting rooms, point-of-sale bulk checkout, and shelf inventory robots use the AS3991-BQFT for reliable passive tag reads in cluttered RF environments. The chip's EPC Class 1 Gen 2 anti-collision handling reliably singulates dozens of tags presented simultaneously, which is the core requirement for instant basket-level checkout where items are dropped into an RF shielded zone. Its sensitivity supports reads from low-power transmissions, reducing interference between adjacent checkout stations in dense store layouts. Designers pair the chip with shielded antenna cavities and use its programming options to fine-tune session and Q parameters for the specific tag mix. RoHS compliance and global band coverage let the same IoT reader hardware ship worldwide with only firmware configuration changes.
Recomendado
Resumen de productos recomendados
Datos de referencia de ingeniería para AS3991-BQFT — comparación, orientación de diseño e información de cumplimiento.
Guía de selección
Comparación con alternativas
| Parámetro | Este producto | AS3990-BQFT | AS3991-BQFT-33 | AS3992-BQFT | AS3990-BQFT-33 |
|---|---|---|---|---|---|
| Package | 64-VFQFN Exposed Pad | 64-VFQFN Exposed Pad - same | 64-VFQFN Exposed Pad - same | 64-VFQFN Exposed Pad - same | 64-VFQFN Exposed Pad - same |
| Brand | ams OSRAM | ams OSRAM | ams OSRAM | ams OSRAM | ams OSRAM |
| Frequency Range | 840 MHz to 960 MHz | 840 MHz to 960 MHz | 840 MHz to 960 MHz | 840 MHz to 960 MHz | 840 MHz to 960 MHz |
| Protocol | EPC Class 1 Gen 2 / ISO 18000-6C | EPC Class 1 Gen 2 / ISO 18000-6C | EPC Class 1 Gen 2 / ISO 18000-6C | EPC Class 1 Gen 2 / ISO 18000-6C | EPC Class 1 Gen 2 / ISO 18000-6C |
| Enhanced Integration Options (AS3991 feature set) | Yes | No | Yes | Variant configuration | No |
| Supply Variant | Standard | Standard | 3.3 V variant | Standard | 3.3 V variant |
| Packaging | Tape & Reel (TR) | Tape & Reel | Tape & Reel | Tape & Reel | Tape & Reel |
Diferenciadores clave
- Full EPC Gen 2 protocol handling in silicon (frente a AS3990-BQFT)
- Continuous multi-region frequency coverage (frente a AS3991-BQFT-33)
- Single-chip integration reduces BOM (frente a Discrete PA + PLL + MCU-based Gen 2 implementations)
Notas de diseño
The exposed pad of the 64-VFQFN is the primary RF and thermal ground. Use a solder stencil with approximately 50-70% coverage on the center pad aperture array to avoid voids while ensuring reliable wetting, and stitch the pad to the ground plane with a via fence (at least 3x3 via array). Poor exposed-pad soldering is the most common cause of degraded receiver sensitivity and unstable PA output on this family. Place all RF matching components within a few millimeters of the antenna pins to minimize parasitic trace inductance.
Provide a dedicated, well-decoupled supply for the PA and analog front end: bulk 10 uF plus 100 nF ceramic capacitors directly at the supply pins, and an LC filter (ferrite bead plus 4.7 uF) isolating the analog rail from the noisy digital host supply. PA transmit bursts create significant supply transients; inadequate decoupling manifests as phase noise on the carrier and reduced tag read range. Verify supply droop during maximum-power continuous inventory sweeps with an oscilloscope, not just a multimeter.
Regional regulatory compliance is a firmware plus RF-hardware task: the chip covers 840-960 MHz, but the antenna matching network and output filtering must be tuned per band (ETSI 865-868 MHz vs FCC 902-928 MHz) to meet each emission mask. Do not ship a broadband untuned output stage; you may fail certification or waste transmit power. Also confirm register configuration against the official AS3990/91 manual, since third-party code examples frequently mix AS3990 and AS3991 register maps.
Información de cumplimiento
Lead Free status and RoHS compliance per distributor specification data for AS3991-BQFT. REACH, halogen-free, and conflict-minerals status not stated in retrieved data.
