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Immobilizers
Immobilization
NXP's transponders meet the security and performance requirements of modern vehicle immobilizer applications. Excellent device sensitivity (large distance) and short authentication time ensure easy application and outstanding system performance.
Products
The following transponders have been specifically designed for car immobilizers where (re)programming of the identification code or storage of additional data is required.
The PCF7936 (HITAG 2) is a programmable security transponder employing mutual authentication with encrypted data transmission. It is ideally suited for vehicle immobilizer applications which require encrypted data transmission between the basestation and transponder.
The PCF7931AS (read only) and PCF7930AS (read/write) are immobilizer transponder sticks which transmit data bi-directionally, in half duplex mode, between basestation and the transponder.
The PCF7935 (SECT) is a programmable security transponder employing challenge/response authentication and is ideally suited for vehicle immobilizer applications, where encrypted data transmission between basestation and transponder is required.
Product overview
| Type number | PCF7930AS | PCF7931AS | PCF7935AS | PCF7936AS |
|---|---|---|---|---|
| Data periodically read out in read only mode | Yes |
Yes |
Yes |
Yes |
| Non volatile user memory | 768 bit |
- |
768 bit |
128 bit |
| Operating frequency | 125 kHz |
125 kHz |
125 kHz |
125 kHz |
| Programmable read only operation | Yes |
Yes |
Yes |
Yes |
| Programmable security transponder | - |
- |
Yes |
Yes |
| 64/32 bit mutual authentication | - |
- |
- |
Yes |
| 48/48 bit challenge/ response authentication |
- |
- |
Yes |
- |
| 32 bit unique device identification number | Yes |
Yes |
Yes |
Yes |
| Secret key | - |
- |
128 bit |
48 bit |
| Fast authentication | - |
- |
- |
39 ms |
| EEPROM read/write protection capabilities | Yes |
Yes |
Yes |
Yes |
| Read only modes for downwards compatibility | Yes |
Yes |
Yes |
Yes |
| Data retention | 20 years |
20 years |
20 years |
20 years |
| Extended temperature range | - 40 to +85 °C |
- 40 to +85 °C |
- 40 to +85 °C |
- 40 to +85 °C |
| Leadless stick plastic package | SOT385 |
SOT385 |
SOT385 |
SOT385 |
To download technical documentation click here