EM4305 In Stock

EM4305 125kHz Read/Write RFID Transponder

Name: EM4305 125kHz Read/Write RFID Transponder
Brand: EM Microelectronics
SKU: EM4305

EM4305 is a 125kHz low-frequency RFID read/write transponder IC powered by the inductive coil. Supports ASK/FSK/PSK modulation with 512-bit EEPROM — widely used in access control cards, employee ID cards, animal identification, and industrial tracking.

Frequency

125 kHz

Memory

512-bit EEPROM

Modulation

ASK / FSK / PSK

Data Rate

Up to 8 kbps

Features

Operating frequency: 125 kHz
Memory: 512-bit EEPROM (32 × 16-bit)
ASK / FSK / PSK modulation support
Data rate: up to 8 kbps
Passive — powered by reader coil
Data retention > 100 years
Endurance > 100,000 write cycles
ISO 11784/11785 animal identification compatible

Specifications

Frequency	125 kHz
Memory	512-bit EEPROM
Modulation	ASK / FSK / PSK
Data Rate	Up to 8 kbps
Power	Passive (inductive)
Data Retention	> 100 years
Endurance	> 100,000 cycles
Package	TSSOP8, SOT23

Applications

RFID125kHzLF RFIDAccess ControlSmart Card

Order Info

Stock, pricing, lead time, and samples for EM4305 — we reply within one business day.

Request Quote Request datasheet / sample

EM Microelectronics

Switzerland

Ultra-Low Power ICs — Semiconductor brand of the Swatch Group

View all EM Microelectronics products → Official EM Microelectronics site

EM4305 replaces these parts

Engineers use EM4305 as a second source or alternative for the parts below. Open each for compatibility notes (drop-in / software / alternative) and an RFQ.

T5577 / T5557 (125kHz read/write) Functional alternative

Atmel / Microchip

View cross-reference →

Selection guides & comparisons

Guide

RFID Tag IC Frequency Selection: 125 kHz vs 13.56 MHz vs UHF

EM4305 — Frequently Asked Questions

Where can I buy EM4305?

JLink Technology is an authorized EM Microelectronics distributor serving Taiwan, Mainland China, and Hong Kong. Submit an RFQ for EM4305 and we will respond with pricing and lead time within one business day.

Is EM4305 in stock?

Stock and lead time for EM4305 vary by quantity. Send us your required quantity via the RFQ form and we will confirm current availability and delivery schedule.

Can I get the EM4305 datasheet and samples?

Yes. As an authorized EM Microelectronics distributor, JLink Technology can provide the official EM4305 datasheet, samples, and engineering support. Contact us to request them.

What is the minimum order quantity for EM4305?

We support orders from prototype samples to mass production. Tell us your target volume in the RFQ and we will quote accordingly.

Is there a pin-compatible alternative or second source for EM4305?

Tell us the part you need to replace and your application. As a multi-line authorized distributor, JLink Technology can suggest a verified cross-reference or second source related to EM4305 where one exists, and quote pricing, stock, and lead time.

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