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PCF7936AS

Security Transponder (HITAG2)

NXP Semiconductors. 

NXP Semiconductors

Security Transponder (HITAG2)

Product Specification

PCF7936AS

1 FEATURES

• Security Transponder for use in contactless

authentication applications

• Data transmission and energy supply via LF link

• 32 bit quasi unique device identification (serial number)

and product type identification.

• Fast mutual authentication, 39ms

• 48 bit Secret Key

• 256 bit EEPROM for user data storage (128 bit) and

device configuration/personalization (128 bit)

• EEPROM read/write protection features

• 20 years non-volatile data retention

• More than 100 000 EEPROM erase/write cycles

• Once the memory has been erased by UV, access is

denied

• Read Only emulation modes (H400x, ISO 11784/85 and

PCF7931)

• Excellent sensitivity in read and write mode

• Automotive temperature range: -40°C to +85°C

• Leadless plastic stick package

2 GENERAL DESCRIPTION

The PCF7936AS is a high performance automotive proof

Security Transponder for vehicle Immobilization

applications, where the transponder has to identify itself

towards the basestation as an authorized device.

The Security Transponder derives its power supply from

the magnetic field (LF field) established by the basestation.

No additional battery supply is needed. Data is transmitted

by modulating the LF field.

The Security Transponder features secure contactless

authentication, employing a Secret Key and a random

number in order to cipher any communication between the

device and the basestation. The secure contactless

authentication is ideally suited for vehicle immobilization

applications. In addition, the device features a factory

programmed quasi unique serial number that also serves

as product type identification.

If desired, the device may be operated as a Read/write

transponder with access control by password or as a

Read Only transponder.

3 ORDERING INFORMATION

EXTENDED

TYPE NUMBER

PCF 7936AS/3851

PCF 7936AS/3851/C

PACKAGE

NAME

DESCRIPTION

SOT3851 leadless plastic stick package

SOT3851 leadless plastic stick package

OUTLINE VERSION

SOT385-1

SOT385-1

TEMPERATURE

RANGE (°C)

-40°C to +85°C

-40°C to +85°C

2010 May 04

4

CONFIDENTIAL

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