ST25R3917-AQFT STMicroelectronics Integrated Circuit (Quad Flat No-Lead) In Stock
The ST25R3917-AQFT is a high-performance NFC universal device and EMVCo reader IC from STMicroelectronics supporting ISO 14443, ISO 15693, and NFC protocols. It operates from a 2.4 V to 5.5 V supply and integrates a 1.5 W output power amplifier. Available in a compact QFN-32 package with worldwide stock and fast shipping.
- Manufacturer
- STMicroelectronics
- Package
- Quad Flat No-Lead
- Pin Count
- 33
- Lifecycle
- ACTIVE
- Datasheet
- ST25R3917-AQFT Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Integrated 1.5 W output power amplifier for extended NFC read range up to 10 cm
- Multi-protocol support: ISO 14443A/B, ISO 15693, NFC-A/B/F/V and EMVCo certified
- Low power standby mode with adjustable 500 ms wake-up interval for battery-powered designs
- Programmable SPI or I2C interface with automatic antenna tuning capability
Applications
The ST25R3917-AQFT is widely used in contactless payment terminals requiring EMVCo compliance, enabling secure tap-to-pay transactions at retail point-of-sale systems. It is also deployed in access control readers, industrial HF RFID scanners, and IoT gateway devices that need to read ISO 15693 tags across multiple frequency bands. Wearable health devices and smart home hubs leverage its low standby current below 1 µA to extend battery life while maintaining always-on NFC detection.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for ST25R3917-AQFT:
Frequently Asked Questions
What supply voltage range does the ST25R3917-AQFT support for portable NFC reader designs?
The ST25R3917-AQFT operates from a 2.4 V to 5.5 V supply rail, making it compatible with single-cell Li-ion batteries at 3.7 V and standard 5 V logic systems. Its integrated 1.5 W power amplifier delivers sufficient RF field strength without an external PA, reducing BOM cost. Standby current is below 1 µA, extending runtime in battery-powered access badges and wearables.
Which NFC and RFID protocols does the ST25R3917-AQFT support for multi-standard reader implementations?
The ST25R3917-AQFT supports ISO 14443A/B up to 848 kbps, ISO 15693 at 26.48 kbps, ISO 18092 NFC-IP1, and is EMVCo 3.0 certified for contactless payment. NFC forum tag types 1 through 5 are also covered. This multi-protocol capability allows a single reader IC to handle credit cards, transit passes, and asset tracking labels across all 13.56 MHz standards without firmware hardware changes.
How does the ST25R3917-AQFT compare to the ST25R3916 in terms of output power and antenna tuning features?
The ST25R3917-AQFT upgrades the ST25R3916 by integrating automatic antenna tuning (AAT) that dynamically adjusts the matching network within ±2 dBm, removing the need for manual calibration when antenna proximity changes. Both share the same 1.5 W output power and QFN-32 package footprint, so the ST25R3917 is a pin-compatible drop-in upgrade for existing ST25R3916 designs that need higher robustness in variable-metal environments.
For a compact payment terminal design, what interface does ST25R3917-AQFT use to connect to a host MCU?
The ST25R3917-AQFT provides a 4-wire SPI interface up to 6 MHz or an I2C bus up to 400 kHz for host communication, selectable by a dedicated interface-select pin. An interrupt output line notifies the host MCU of tag detection events without continuous polling, saving CPU cycles. The SPI mode is recommended for payment terminals requiring fast 848 kbps data transfers to meet EMVCo transaction time budgets under 500 ms.
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About STMicroelectronics
STMicroelectronics is a global semiconductor leader serving customers across the spectrum of electronics applications. ST's products are found in a wide range of applications including automotive, industrial, personal electronics, and communications.
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