Gym & 24/7 Fitness Club Access Control Hardware
Gym access control system hardware for 24/7 clubs: fob and wristband readers, face and QR terminals, anti-passback controllers and no-touch exit buttons.
ValenID · valenid.com · sales@valenid.com
HF-240 13.56 MHz NFC Reader Module, UART TTL, 30 × 16 mm
30 × 16 × 8.9 mm ISO14443A/B reader for MIFARE, DESFire, Ultralight and NTAG with a 3.3 V TTL UART, auto or command-triggered reads, and an external 50 Ω antenna.
- Reads ISO/IEC 14443A, ISO/IEC 14443B and ISO/IEC 18092 credentials at 13.56 MHz
- MIFARE Classic, DESFire EV1/EV2, Ultralight/Ultralight C, NTAG2xx and NFC Forum Type 1/2/4
- UART at 3.3 V TTL levels, 9600–115200 bps (default 115200)
- Active auto-read mode or passive command-triggered mode
- External 50 Ω antenna on a 4-pin, 1.25 mm connector
- Frequency
- 13.56 MHz
- Protocols
- ISO14443A/B, ISO18092
- Interface
- UART, 3.3 V TTL
- Baud rate
- 9600–115200 bps (default 115200)
- Power
- 5 V DC, ≤ 120 mA
- Dimensions
- 30 × 16 × 8.9 mm (±1.0 mm)
Reply within 24 hours Tested before dispatch Worldwide shipping
13.56 MHz NFC Reader Module, UART TTL, 30 × 16 mm: overview
The HF-240 is a 13.56 MHz NFC reader module with a 3.3 V TTL UART, measuring 30 × 16 × 8.9 mm and weighing about 1.8 g as a bare board. It is aimed at OEMs that need MIFARE and ISO/IEC 14443 card reading in very little space: handheld terminals, PCs and keyboards, displays, service kiosks and ticketing equipment.
Supported standards are ISO/IEC 14443A, ISO/IEC 14443B and ISO/IEC 18092. In practice that covers MIFARE Classic, MIFARE DESFire EV1/EV2, MIFARE Ultralight and Ultralight C, NTAG2xx, contactless CPU (microprocessor) cards, and NFC Forum Type 1, 2 and 4 tags. The RF side runs on a dedicated contactless communication chip. The antenna is external (50 Ω), so you can size the coil and position it where cards are presented instead of where the board happens to fit.
Two reading modes are available. In active mode the module scans on its own and sends each card it finds; in passive mode it waits for a read command from the host, keeping the serial line quiet until your application asks. The baud rate is adjustable from 9600 to 115200 bps (default 115200), and firmware can be upgraded over the serial port.
Integration notes
A 6-pin, 2.0 mm pitch header carries +5 V DC, GND, TXD and RXD; pins 5 and 6 (SCL/D1, SDA/D0) have no function on this version. The UART uses 3.3 V TTL levels. The antenna plugs into a 4-pin, 1.25 mm connector, and a separate 2-pin, 2.0 mm header is not connected. Allow up to 120 mA while reading and 100 mA in standby. No certification is listed for the bare module. The 125 kHz LF-150 and the dual-frequency HF-250 use the same outline and 6-pin header, so a single carrier board can accept any of the three.
More features
- 30 × 16 × 8.9 mm, about 1.8 g; firmware upgradeable over the serial port
- Same outline and 6-pin header as the LF-150 (125 kHz) and HF-250 (dual-frequency)
HF-240 specifications
RF & credentials
| Frequency | 13.56 MHz |
|---|---|
| Standards | ISO/IEC 14443A, ISO/IEC 14443B, ISO/IEC 18092 |
| Supported cards and tags | MIFARE Classic, MIFARE DESFire EV1/EV2, MIFARE Ultralight, MIFARE Ultralight C, NTAG2xx, contactless CPU (microprocessor) cards, NFC Forum Type 1, 2 and 4 tags |
| Antenna | External, 50 Ω (at 13.56 MHz) |
| Reading modes | Active (automatic) or passive (on host read command) |
Interfaces
| Host interface | UART, TTL 3.3 V levels |
|---|---|
| Baud rate | 9600–115200 bps (default 115200) |
| Firmware update | Via serial port |
| Connectors | 6-pin 2.0 mm pitch (power/UART); 4-pin 1.25 mm (antenna); 2-pin 2.0 mm (not used) |
Electrical
| Supply voltage | 5 V DC |
|---|---|
| Operating current | ≤ 120 mA |
| Standby current | ≤ 100 mA |
Mechanical & environment
| Dimensions | 30 × 16 × 8.9 mm ±1.0 mm |
|---|---|
| Weight | Approx. 1.8 g (bare board) |
| Operating temperature | –20 to +60 °C (–4 to +140 °F) |
| Operating humidity | 20–80% RH, non-condensing |
| Storage temperature | –40 to +80 °C (–40 to +176 °F) |
| Certification | None listed for the module |
Connector pinout
| Pin | Signal | Function |
|---|---|---|
| P1-1 | 5V | Power supply, +5 V DC |
| P1-2 | GND | Ground |
| P1-3 | TXD | UART transmit (3.3 V TTL) |
| P1-4 | RXD | UART receive (3.3 V TTL) |
| P1-5 | SCL/D1 | No function |
| P1-6 | SDA/D0 | No function |
| P2 | ANT | External 13.56 MHz antenna connection |
| P3-1 | NC | No function |
| P3-2 | NC | No function |
P1: 6-pin, 2.0 mm pitch. P2: 4-pin, 1.25 mm pitch antenna connector. P3: 2-pin, 2.0 mm pitch.
Specifications can change between production batches. Confirm the current revision with us before placing volume orders.
Ordering options
Quote the SKU that matches your frequency, interface and mounting. Not sure? Send us your controller model and we will pick the variant for you.
| SKU | Configuration | Actions |
|---|---|---|
| HF-240-M-T | 13.56 MHz ISO14443A/B module, 30 × 16 mm, UART (3.3 V TTL) interface, external antenna connector |
Where the HF-240 is used
- EV chargers that read a MIFARE or DESFire user card only when a session is requested
- Smart lockers in gyms and staff areas identifying members by NTAG or MIFARE Ultralight wristband
- Handheld terminals and tablets adding NFC tag reading over a 3.3 V microcontroller UART
- PCs, keyboards and service kiosks with an operator-login badge reader behind the front panel
RFID for EV Charging Stations: Modules, Cards & Fobs
EV charger RFID cards, key fobs and 13.56 MHz reader modules for charger OEMs and operators: UID formats, OCPP idTag mapping and UART integration notes.
HF-240 FAQ
Does the HF-240 read ISO 15693 or ICODE tags?
No. It supports ISO/IEC 14443A, 14443B and 18092 credentials. For ISO 15693 and ICODE tags, use the HF-230 multi-protocol module.
What read distance should I expect?
No read distance is specified, because it depends on the external antenna you pair with the module and on the card. Request a sample to measure range with your own antenna and enclosure.
What antenna does the module need?
An external 13.56 MHz antenna matched to 50 Ω, connected to the 4-pin, 1.25 mm antenna connector.
Can I connect it to a 5 V microcontroller?
The module runs from 5 V DC, but TXD and RXD use 3.3 V TTL levels. Check that your MCU accepts 3.3 V inputs, and level-shift the host TX line if it drives 5 V.
Can one host PCB take both 125 kHz and 13.56 MHz modules?
Yes, mechanically. The LF-150 (125 kHz) and HF-250 (dual-frequency) share this 30 × 16 mm outline and 6-pin header pinout; check the command set of each module in your firmware.
Before you buy
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Get pricing for the HF-240
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