LF 125 kHzEM Microelectronic

EM4102

Name: EM Microelectronic EM4102
Brand: EM Microelectronic

The EM Microelectronic EM4102 is an LF 125 kHz RFID tag IC, with 64 bits total (factory laser-programmed, read-only), operating at 100 - 150 kHz, under EM4102 proprietary format (Manchester, Biphase or PSK encoding).

Read-only 64-bit contactless ID device, EM4100 successor

Official Datasheet ↗

Frequency

100 - 150 kHz

Protocol

EM4102 proprietary format (Manchester, Biphase, or PSK encoding)

Memory

64 bits total (factory laser-programmed, read-only)

Interface

RF (contactless)

Temp Range

-40°C to +85°C

Form Factor

Die (1016 × 1295 µm), wafer, sawn wafer, sticky tape, waffle pack, or card form

Full Specifications

Manufacturer	EM Microelectronic
Frequency Category	LF 125 kHz
Frequency	100 - 150 kHz
Protocol	EM4102 proprietary format (Manchester, Biphase, or PSK encoding)
Memory	64 bits total (factory laser-programmed, read-only)
Interface	RF (contactless)
Temperature Range	-40°C to +85°C
Form Factor	Die (1016 × 1295 µm), wafer, sawn wafer, sticky tape, waffle pack, or card form
Security	None (read-only device with factory-programmed unique ID)

Engineering Brief

The EM4102 is a read-only 125 kHz LF RFID chip with 64 bits of factory laser-programmed memory. It is powered entirely by an external coil in an electromagnetic field and transmits data via load modulation using Manchester, Biphase, or PSK encoding at 64, 32, or 16 RF cycles per data bit. The chip integrates a full-wave rectifier, resonance capacitor (78 pF), supply buffer capacitor, and voltage limiter, requiring only an external coil (~20.8 mH for 125 kHz) to function. It is designed for animal identification and industrial transponder applications with ultra-low power consumption and very small die size suitable for implantation.

Typical Applications

Standards & Compliance

ISO 11784 / 11785 (Animal ID)

Frequently Asked Questions

What is the memory capacity of the EM4102 RFID chip?

The EM4102 has 64 bits of factory laser-programmed, read-only memory that stores a unique ID. This memory cannot be rewritten or modified after manufacturing.

What operating frequency does the EM4102 use?

The EM4102 operates in the low frequency (LF) band from 100 to 150 kHz, with typical operation at 125 kHz. It requires an external coil of approximately 20.8 mH for 125 kHz resonance.

Does the EM4102 require a battery?

No, the EM4102 is a fully passive device powered entirely by the electromagnetic field from an external reader coil. It has no battery and integrates a full-wave rectifier and voltage regulation circuitry.

What data encoding methods does the EM4102 support?

The EM4102 supports Manchester, Biphase, or PSK (Phase Shift Keying) encoding methods. Data transmission rates are configurable at 64, 32, or 16 RF cycles per data bit using load modulation.

Can the EM4102 memory be reprogrammed after manufacturing?

No, the EM4102 is a read-only device with factory laser-programmed memory. The 64-bit unique ID is permanently written during chip production and cannot be altered.

What are the typical applications for the EM4102 chip?

The EM4102 is designed for animal identification (pet tagging and livestock tracking), access control systems, and industrial transponder applications. Its small die size makes it suitable for implantable applications.

Explore

Manufacturer

All EM Microelectronic chips →

Standards

ISO 11784 / 11785 (Animal ID)

Applications

Compare with…

Cross-manufacturer alternatives

Sourcing EM Microelectronic EM4102 in volume?

Roxtron builds custom RFID and NFC products around the EM4102 — smart cards, labels, wristbands, key fobs and industrial tags. Tell us your project and we'll come back within 24 hours with pricing and lead times.

Get a quote