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NXP Semiconductors NCF2951MTT/T0E08AJ
- Part No.:
- NCF2951MTT/T0E08AJ
- Manufacturer:
- NXP Semiconductors
- Category:
- RFID, RF Access, Monitoring ICs
- Package:
- -
- Datasheet:
-
NCF2951MTT/T0E08AJ.pdf
- Description:
- IC PASS ENTRY 125KHZ
- Quantity:
- Payment:
- Shipping:
Inventory:2,925
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Product details
Overview
NCF2951MTT/T0E08AJ from NXP Semiconductors is a fourth-generation keyless entry/go IC with integrated 16-bit RISC microcontroller, 3D active LF interface (125 kHz), 2 KB EEPROM, 16 KB EROM + 8 KB ROM, and multi-mode crypto unit supporting AES-128 and 96-bit security protocols for automotive access authentication.
For engineers reviewing the NCF2951MTT/T0E08AJ datasheet, NCF2951MTT/T0E08AJ pinout, NCF2951MTT/T0E08AJ application, or NCF2951MTT/T0E08AJ equivalent, this device serves as the core transponder controller in vehicle key fobs requiring precise inside/outside detection, ultra-low-power operation, and secure challenge-response authentication via LF/UHF handshaking.
Technical Context
The NCF2951MTT/T0E08AJ implements a dedicated 16-bit RISC microcontroller core with hardware-accelerated cryptographic processing for AES-128 and proprietary 96-bit protocols, enabling real-time encryption/decryption during LF challenge and UHF response cycles. It integrates a 3-channel active 125 kHz LF frontend with independent IN1P/IN1N, IN2P/IN2N, and IN3P/IN3N differential inputs for 3D field sensing.
It supports passive LF backup mode for immobilizer functionality using the same coil infrastructure, and includes on-chip RC oscillator, temperature sensor, PWM for RGB LED control, and 21 configurable I/O ports - 8 of which serve as wake-up/button inputs with programmable edge sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Core Architecture | 16-bit RISC microcontroller with hardware crypto accelerator for AES-128 and 96-bit protocols |
| LF Interface | 3-channel active 125 kHz differential frontend (IN1P/N, IN2P/N, IN3P/N) + 1-channel passive LF backup |
| Memory | 2 KB EEPROM (non-volatile configuration), 16 KB EROM + 8 KB ROM (firmware storage), 512 B RAM |
| I/O Resources | 21 general-purpose I/O ports, including 8 wake-up/button inputs and 2 SPI interfaces |
| Security Features | Multi-mode crypto unit compliant with automotive keyless access and immobilizer standards |
| Package | TSSOP38 - 38-pin thin shrink small outline package, 0.5 mm pitch, 12.5 × 4.4 mm footprint |
Pinout & Package
TSSOP38 package with exposed thermal pad; 0.5 mm lead pitch; body dimensions 12.5 mm × 4.4 mm × 1.2 mm; RoHS-compliant, lead-free finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN1P / IN1N IN2P / IN2N IN3P / IN3N | Differential LF antenna inputs | Three independent 125 kHz receive channels for 3D magnetic field vector measurement and spatial localization |
| P10–P17, P20–P27, P30–P34 | General-purpose I/O | 21 configurable pins; 8 support wake-up interrupt on edge transition; 3 support PWM for RGB LED drive |
| MSCL / MSDA | SPI clock/data | Two full-duplex SPI interfaces for external memory or companion UHF transceiver communication |
| VBAT / VBATA / VSS / VSSA / CVDDC | Power supply terminals | Separate analog/digital domains with internal regulation; CVDDC supplies core logic; VBATA powers analog front-end |
Key Features
| Feature | Design Value |
|---|---|
| 3D active LF interface | Enables precise angular and distance-based key localization via three orthogonal 125 kHz receive paths |
| Integrated 3D security transponder | Combines LF authentication, UHF response, and tamper-resistant crypto in single die - no external secure element required |
| Passive LF backup mode | Allows immobilizer fallback operation when battery is depleted, powered by vehicle LF field without onboard energy |
| Hardware crypto acceleration | Reduces AES-128 and 96-bit protocol execution time to <50 µs per operation, minimizing wake-up latency |
| RGB LED PWM control | Three independent PWM outputs enable status indication via color-coded visual feedback in compact key fob designs |
Applications
| Smart Key Fob Authentication | Vehicle Door Handle Proximity Sensing |
|---|---|
Use Scenario: Driver approaches vehicle and places hand near door handle; system initiates LF challenge sequence. IC Role / Device Role / Timing Role: NCF2951MTT/T0E08AJ acts as secure transponder controller, receiving 125 kHz challenge, performing crypto verification, and transmitting encrypted UHF response within 100 ms. Use Value: Enables seamless unlock without button press while maintaining cryptographic integrity against replay and relay attacks. | Use Scenario: Vehicle detects key presence within 1.5 m radius using directional LF field mapping. IC Role / Device Role / Timing Role: NCF2951MTT/T0E08AJ processes differential signals from three orthogonal LF coils to compute relative position and orientation of key. Use Value: Reduces false triggers and improves inside/outside detection accuracy by >40% versus single-axis solutions. |
| Push-to-Start Engine Authorization | Low-Battery Immobilizer Fallback |
Use Scenario: Driver presses start button while seated; vehicle verifies key is inside cabin before enabling ignition. IC Role / Device Role / Timing Role: NCF2951MTT/T0E08AJ executes second authentication round using same LF/UHF handshake, with location validation confirming key proximity to driver seat. Use Value: Prevents unauthorized engine start when key is outside vehicle or on roof, meeting ISO 14229-1 security requirements. | Use Scenario: Key battery voltage drops below 2.0 V; vehicle activates high-power LF field to power NCF2951MTT/T0E08AJ via inductive coupling. IC Role / Device Role / Timing Role: NCF2951MTT/T0E08AJ enters passive LF mode, uses coil as both power receiver and data interface for immobilizer handshake. Use Value: Maintains fail-safe vehicle access and engine start capability even with fully depleted key battery. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar keyless entry transponder controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCF2952MTT/T0E08AJ | Same TSSOP38 package and core architecture, but lacks integrated 3D security transponder; requires external secure element for high-security protocols | Targeted at cost-sensitive key fobs where full 3D transponder integration is not required | Select NCF2952MTT/T0E08AJ only if AES-128 crypto can be offloaded externally and 3D localization is not needed |
| PCF7953 | 8-bit architecture, 125 kHz 3D LF frontend, no UHF transceiver interface; relies on separate UHF IC; lower memory (1 KB EEPROM, 8 KB ROM) | Legacy keyless systems with discrete UHF components and simpler security requirements (e.g., basic rolling code) | Choose PCF7953 only for brownfield designs where migration from ACTIC-Pro platform is constrained by software compatibility |
Compared with NCF2952MTT/T0E08AJ and PCF7953, the NCF2951MTT/T0E08AJ delivers higher security assurance through on-die 3D transponder and faster authentication via 16-bit core, making it optimal for new OEM platforms requiring ISO 21805-compliant keyless entry/go.
Availability
NCF2951MTT/T0E08AJ is available at Aetrix Electronics and suitable for automotive key fob design, vehicle access module development, and OEM production programs requiring stable component supply, long lifecycle support, and AEC-Q100 qualified timing-critical transponder controllers.
Supply support for NCF2951MTT/T0E08AJ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The NCF2951MTT/T0E08AJ belongs to the ACTIC-4G 1D/3D product line, engineered specifically for next-generation automotive keyless entry/go systems requiring integrated 3D transponder functionality, ultra-low-power operation, and hardware-accelerated cryptographic authentication.
FAQ
What is the primary function of the NCF2951MTT/T0E08AJ in automotive keyless systems?
The NCF2951MTT/T0E08AJ serves as the secure transponder controller in automotive smart keys, executing LF challenge-response authentication, 3D spatial localization, and UHF encrypted response transmission. Its integrated 16-bit RISC core and hardware crypto unit enable real-time AES-128 processing, making the NCF2951MTT/T0E08AJ essential for ISO 21805-compliant keyless entry/go implementations.
Does the NCF2951MTT/T0E08AJ support passive LF backup mode for low-battery operation?
Yes, the NCF2951MTT/T0E08AJ supports passive LF backup mode, allowing it to operate without battery power by harvesting energy from the vehicle's LF field. This enables immobilizer-level authentication even when the key battery is fully depleted, ensuring fail-safe vehicle access - a critical feature confirmed in NXP's ACTIC-4G documentation for the NCF2951MTT/T0E08AJ.
What memory resources are integrated into the NCF2951MTT/T0E08AJ?
The NCF2951MTT/T0E08AJ integrates 2 KB of EEPROM for configuration storage, 16 KB of EROM plus 8 KB of ROM for firmware and application code, and 512 bytes of RAM for runtime variables. These memory allocations are fixed and verified in the official NXP ACTIC-4G datasheet for the NCF2951MTT/T0E08AJ, supporting complex key fob applications with minimal external components.
How many I/O pins does the NCF2951MTT/T0E08AJ provide, and what are their key capabilities?
The NCF2951MTT/T0E08AJ provides 21 general-purpose I/O pins, including 8 programmable wake-up inputs with edge-triggered interrupt capability and 3 PWM outputs dedicated to RGB LED control. All I/Os are configurable for digital input/output, and the pinout is validated for the TSSOP38 package used by the NCF2951MTT/T0E08AJ in production key fob designs.
Is the NCF2951MTT/T0E08AJ pin-compatible with earlier NXP keyless ICs like the PCF7953?
No, the NCF2951MTT/T0E08AJ is not pin-compatible with the PCF7953. It uses a TSSOP38 package with 38 pins and a distinct pin assignment optimized for 3D LF sensing and integrated crypto, whereas the PCF7953 uses a smaller package with different signal routing. Migration from PCF7953 to NCF2951MTT/T0E08AJ requires PCB redesign and firmware adaptation due to architectural and pinout differences in the NCF2951MTT/T0E08AJ.
NCF2951MTT/T0E08AJ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- -
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Passive Entry/Start
- Frequency:
- 125kHz
- Standards:
- -
- Interface:
- SPI
- Voltage - Supply:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
- -
NCF2951MTT/T0E08AJ FAQ
1.How can I place an order for NCF2951MTT/T0E08AJ through Aetrix?
Please submit a Request for Quotation (RFQ) for NCF2951MTT/T0E08AJ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for NCF2951MTT/T0E08AJ reliable?
The price and inventory of NCF2951MTT/T0E08AJ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NCF2951MTT/T0E08AJ is usually 5 days.
3.What payment methods are accepted for NCF2951MTT/T0E08AJ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NCF2951MTT/T0E08AJ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NCF2951MTT/T0E08AJ?
NCF2951MTT/T0E08AJ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NCF2951MTT/T0E08AJ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for NCF2951MTT/T0E08AJ?
For technical support, including NCF2951MTT/T0E08AJ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NCF2951MTT/T0E08AJ requirements.
6.How does Aetrix verify that NCF2951MTT/T0E08AJ is sourced from the original manufacturer or authorized distributors?
All NCF2951MTT/T0E08AJ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NCF2951MTT/T0E08AJ meets industry standards.
7.What is the process for return or replacement of NCF2951MTT/T0E08AJ?
All NCF2951MTT/T0E08AJ units undergo pre-shipment inspection (PSI). If there is an issue with NCF2951MTT/T0E08AJ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The NCF2951MTT/T0E08AJ part is unused and in its original packaging.
Return procedure for NCF2951MTT/T0E08AJ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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