Apartment, Multifamily & Rental Property Access Control
Apartment building access control hardware: anti-clone readers with matched fob sets, QR visitor codes, 4G controllers for rentals and UHF tags for gates.
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LF-130 Compact 125 kHz EM4100 Reader Module, TTL or Wiegand 26
32.5 × 17.5 mm EM4100/TK4100 reader board with an external coil antenna, supplied with TTL UART or Wiegand 26 output for space-limited devices.
- 32.5 × 17.5 mm board for locks, handhelds and slim readers
- Reads 125 kHz EM4100, TK4100 and compatible credentials at more than 50 mm
- Two versions: TTL UART or Wiegand 26 output
- TTL output single or continuous (pin A0); serial speed 9600–115200 bit/s
- Card-present status pin and 200 ms buzzer/LED drive pulse
- Frequency
- 125 kHz (EM4100/TK4100)
- Output
- TTL UART / Wiegand 26 (by version)
- Read range
- > 50 mm
- Power
- 5 V DC ±5%, < 100 mA
- Dimensions
- 32.5 × 17.5 mm (±3 mm)
- Antenna
- External coil (pins or 2.0 mm socket)
Reply within 24 hours Tested before dispatch Worldwide shipping
Compact 125 kHz EM4100 Reader Module, TTL or Wiegand 26: overview
The LF-130 fits a 125 kHz EM4100 reader onto a 32.5 × 17.5 mm board for products where a 40 mm square module will not fit: electronic cabinet locks, handheld terminals, slim wall readers and door-entry keypads. The coil antenna is external, so it can sit directly behind the front panel while the board goes wherever there is space.
It reads EM4100, TK4100 and compatible cards and fobs at more than 50 mm and comes in two output versions. The TTL version sends the card number as serial data at a command-set speed of 9600–115200 bit/s (default 115200), either once per card or repeatedly while the card remains in the field. The Wiegand 26 version sends one frame per read, ready for a standard access-controller input.
Simple lock and keypad designs can take presence detection and user feedback straight from the header: one line reports whether a card is in the field, and another goes high for 200 ms on each read to signal a buzzer and LED.
Integration notes
Pin numbering and signal functions match the 40 × 40 mm LF-120, so the host-side signal plan is the same for both sizes. Connections use 2.54 mm pitch pins; the coil attaches to ANT1/ANT2 or to an optional 2.0 mm horizontal socket. Supply is 5 V DC (±5%) with current under 100 mA, and the operating range is –10 to +70 °C.
More features
- Same pin numbering and signal functions as the 40 × 40 mm LF-120 module
- 5 V DC (±5%), under 100 mA; –10 to +70 °C operation
LF-130 specifications
RF & credentials
| Frequency | 125 kHz |
|---|---|
| Credentials | EM4100, TK4100 and compatible cards/fobs |
| Read distance | > 50 mm (depends on card type and installation environment) |
Interfaces
| Output | TTL UART or Wiegand 26 (one per version) |
|---|---|
| Serial baud rate | 9600–115200 bit/s, set by command (default 115200) |
| Output mode | TTL: continuous or once per card (pin A0); Wiegand: once per card |
| Status lines | Card present (A1); buzzer/LED drive, 200 ms high on read (A2) |
Electrical
| Supply voltage | 5 V DC (±5%) |
|---|---|
| Operating current | < 100 mA |
Mechanical & environment
| Module connection | 2.54 mm pitch pins |
|---|---|
| Antenna connection | 2.54 mm header pins (ANT1/ANT2) or optional 2.0 mm horizontal socket |
| Dimensions | 32.5 × 17.5 mm (±3 mm) |
| Operating temperature | –10 to +70 °C |
| Storage temperature | –20 to +80 °C |
| Operating humidity | 15–90% RH |
Output versions
| Variant SKU | Supply | Interface | Card-number output |
|---|---|---|---|
| LF-130-E-T | 5 V DC | TTL UART | Continuous or once per card (set on pin A0) |
| LF-130-E-W | 5 V DC | Wiegand 26 | Once per card read |
Pin definition
| Pin | Signal | Function |
|---|---|---|
| P1-1 | VCC | Power supply + |
| P1-2 | GND | Ground |
| P1-3 | TXD/WG0 | Serial TXD (TTL/serial versions) or Wiegand DATA0 |
| P1-4 | WG1 | Wiegand DATA1 |
| P1-5 | NC | Not connected |
| P1-6 | NC | Not connected |
| P1-7 | NC | Not connected |
| P1-8 | ANT1 | Antenna coil terminal 1 |
| P1-9 | ANT2 | Antenna coil terminal 2 |
| P1-10 | A0 | Output mode: 0 = repeat serial output while card present, 1 = output once (UART only; Wiegand always once) |
| P1-11 | A1 | Card status: 0 = card present, 1 = no card |
| P1-12 | A2 | Buzzer/LED drive: 200 ms high level on each card read |
| J1-1 | TX1 | Optional 2.0 mm horizontal antenna socket, contact 1 |
| J1-2 | TX2 | Optional 2.0 mm horizontal antenna socket, contact 2 |
P1: 2.54 mm pitch pins. J1: optional 2.0 mm horizontal antenna socket.
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 |
|---|---|---|
| LF-130-E-T | Compact 125 kHz EM4100 module, 32.5 × 17.5 mm, TTL UART output (continuous or single mode) | |
| LF-130-E-W | Compact 125 kHz EM4100 module, 32.5 × 17.5 mm, Wiegand 26 output |
Where the LF-130 is used
- Electronic locker and cabinet locks in gyms, spas and staff rooms
- Handheld or portable terminals that identify EM4100 tags over TTL serial
- Slim mullion readers or keypads feeding a Wiegand 26 controller port
- Shrinking an LF-120-based design into a smaller housing while keeping the same pin functions
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LF-130 FAQ
How does the LF-130 differ from the LF-120?
Both use the same pin assignment and electrical ratings. The LF-130 measures 32.5 × 17.5 mm and comes with TTL or Wiegand 26 output, while the 40 × 40 mm LF-120 adds an RS232 version.
Does the Wiegand version repeat the card number?
No. The Wiegand 26 version sends one frame per card read. Continuous output (A0 at logic 0) is only available on the TTL version.
What supply does it need?
5 V DC within ±5%, with operating current below 100 mA.
Can I use a different coil shape?
The coil connects to ANT1/ANT2 on the header or to an optional 2.0 mm horizontal socket. If your housing needs a different coil size, send the dimensions with your RFQ and we will confirm an option.
Before you buy
Related buyer guides
Wiegand vs OSDP vs RS485: Which Reader Interface Should You Specify?
Compare Wiegand, OSDP and RS485 reader interfaces: wiring, cable limits, AES-128 Secure Channel and steps for a compatible access-control migration.
125kHz vs 13.56MHz: Choosing Access Cards and Readers
125 kHz cards are cheap but easy to clone; 13.56 MHz cards add memory and, on DESFire-class chips, AES security. Compare range, chips, security and migration.
Wiegand 26-Bit Format Explained (with a Free Calculator)
Wiegand 26-bit is an even parity bit, 8-bit facility code, 16-bit card number and odd parity bit. Convert card numbers to hex and back with the calculator.
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Get pricing for the LF-130
Send your card type, interface and quantity. You get a quote, lead time and compatibility notes within 24 hours — samples available for most items.