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NXP Semiconductors HT2DC20S20/F,122
- Part No.:
- HT2DC20S20/F,122
- Manufacturer:
- NXP Semiconductors
- Category:
- RFID Transponders, Tags
- Package:
- Datasheet:
-
HT2DC20S20/F,122.pdf
- Description:
- RFID TAG R/W 125KHZ ENCAP
- Quantity:
- Payment:
- Shipping:
Inventory:3,591
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Product details
Overview
HT2DC20S20/F,122 from NXP Semiconductors (formerly Philips Semiconductors) is a 125 kHz contactless RFID transponder IC designed for secure bidirectional communication in half-duplex mode. It features 256-bit EEPROM (128-bit user data + 128-bit control/secret memory), encrypted mutual authentication with 48-bit key, and supports password mode, crypto mode, and three public read-only emulation modes (A/B/C). It is used in access control systems requiring tamper-resistant identification and legacy transponder compatibility.
For engineers reviewing the HT2DC20S20/F,122 datasheet, HT2DC20S20/F,122 pinout, HT2DC20S20/F,122 application, or HT2DC20S20/F,122 equivalent, this page delivers verified technical context, exact memory organization, RF field strength requirements (35–400 µTpp), modulation schemes (Manchester/Biphase/BPLM), and real-world configuration constraints including OTP bits for irreversible page locking.
Technical Context
The HT2DC20S20/F,122 operates exclusively via magnetic coupling at 125 kHz, deriving power and data from the reader's RF field without an internal battery. Its EEPROM is organized into eight 32-bit pages - Pages 0–3 store serial number, keys/passwords, and configuration byte; Pages 4–7 hold user data - with configurable read/write protection per page group via OTP-settable bits in the Configuration Byte (e.g., Bit 6 locks Page 3, Bit 7 locks Pages 1–2).
It implements three distinct operational layers: (1) Crypto Mode uses 48-bit key (32-bit KEY LOW + 16-bit KEY HIGH) for encrypted data exchange; (2) Password Mode relies on matching Password RWD and Password TAG; (3) Public Modes A/B/C emulate MIRO/H400x, ISO 11784/11785, and PCF793X transponders respectively - all using cyclic transmission of user pages without authentication.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Operating Frequency | 125 kHz carrier - defines required reader coil design and antenna tuning range (resonance tolerance ±4 kHz) |
| Memory Size & Type | 256-bit EEPROM - split into 8 pages × 32 bits; enables secure storage of serial number, keys, passwords, and user data |
| Data Transfer Rates | 4.0 kbit/s (transponder→reader), 5.2 kbit/s (reader→transponder) - sets minimum timing margins for command/response sequences |
| Authentication | Mutual authentication with 32-bit serial number, 48-bit secret key, and 36 ms duration - prevents cloning and ensures session integrity |
| RF Field Requirements | 35–400 µTpp for read/write/authentication - determines minimum reader antenna current and coil geometry for reliable operation |
| Endurance & Retention | 100,000 erase/write cycles and 10-year data retention at 55 °C - validates suitability for long-life industrial tagging |
| Environmental Rating | IP67 protection, -40 °C to +85 °C operating range, 1500 g shock rating - confirms robustness in harsh physical deployments |
Pinout & Package
HT2DC20S20/F,122 is a monolithic transponder IC embedded in an epoxy resin stick package (12 × 6 × 3 mm), with no external pins or terminals. Power and data are coupled entirely through an integrated coil antenna; no PCB-level interconnects or solderable terminals exist. The device functions as a self-contained RF tag with no user-accessible electrical interface.
Key Features
| Feature | Design Value |
|---|---|
| Triple Public Mode Emulation | Supports ISO 11784/11785 (Mode B), µEM H400x (Mode A), and PCF793X-compatible (Mode C) - enables drop-in replacement of legacy read-only tags without reader modification |
| OTP-Configurable Memory Locking | Irreversible locking of Pages 1–2 (Bit 7) and Page 3 (Bit 6) prevents post-deployment tampering of keys and configuration - critical for secure provisioning |
| Dual Security Modes | Password Mode (plain text with 32-bit RWD/TAG) and Crypto Mode (48-bit encrypted exchange) - allows cost/performance trade-off across security tiers |
| HALT Command Functionality | Enables sequential multi-tag interrogation by muting individual transponders after communication - eliminates collision in dense tag environments |
| Encoding Flexibility | Manchester coding (transponder→reader) and BPLM (reader→transponder) - ensures interoperability with diverse reader base designs |
Applications
| Access Control Systems | Animal Identification |
|---|---|
Use Scenario: Secure door entry using handheld or fixed readers verifying employee credentials stored on HT2DC20S20/F,122 tags. IC Role / Device Role / Timing Role: Contactless transponder providing authenticated identity via mutual crypto handshake and encrypted data exchange. Use Value: Prevents credential cloning through 48-bit key-based encryption and OTP-locked configuration - meeting ISO/IEC 14443-A level assurance for physical access. |
Use Scenario: Livestock tracking in farms using ISO-compliant readers scanning implanted or ear-tagged HT2DC20S20/F,122 devices. IC Role / Device Role / Timing Role: Read-only transponder emulating ISO 11784/11785 (Public Mode B) with cyclic 128-bit transmission from Pages 4–7. Use Value: Enables regulatory compliance without custom reader firmware - leverages existing animal ID infrastructure while retaining upgrade path to secure modes. |
| Industrial Asset Tagging | Legacy System Migration |
Use Scenario: High-shock environment equipment tagging (e.g., construction tools, mining gear) exposed to vibration, dust, and moisture. IC Role / Device Role / Timing Role: Ruggedized transponder delivering IP67-rated, 1500 g shock-tolerant identification under continuous RF exposure. Use Value: Sustains reliable read performance where standard tags fail - validated for -40 °C to +85 °C operation and epoxy-encapsulated mechanical integrity. |
Use Scenario: Upgrading existing MIRO or µEM H400x read-only installations to support secure read/write functionality without replacing readers. IC Role / Device Role / Timing Role: Dual-role transponder operating in Public Mode A (emulation) during legacy reads and switching to Password/Crypto Mode for enhanced operations. Use Value: Eliminates capital expenditure on new readers - extends ROI of installed base while adding cryptographic security and write capability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar contactless transponder applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| EM4102 | Read-only 125 kHz transponder; no EEPROM, no crypto, no password, no HALT command; 64-bit ROM only | Limited to basic identification; cannot support secure access or data update | Select only when absolute cost minimization and static ID are sufficient - no upgrade path to security |
| TK4100 | 125 kHz read/write transponder with 512-bit EEPROM; no mutual authentication; proprietary single-password protection only | Supports data updates but lacks cryptographically verified identity - vulnerable to replay and cloning | Choose for non-critical asset tracking where encryption is unnecessary and higher memory is needed |
Compared with EM4102 and TK4100, the HT2DC20S20/F,122 uniquely combines OTP-configurable memory locking, 48-bit mutual authentication, and triple-mode emulation - making it the only option among the three that satisfies both legacy compatibility and FIPS-grade secure access requirements.
Availability
HT2DC20S20/F,122 is available at Aetrix Electronics and suitable for access control systems, animal identification programs, industrial asset tagging, and legacy system migration projects requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for HT2DC20S20/F,122 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, formerly Philips Semiconductors, is a global leader in high-performance secure identification and connectivity solutions, with core expertise in RFID, NFC, and automotive microcontrollers.
The HITAG™ product line - including HT2DC20S20/F,122 - was specifically engineered for secure, battery-free contactless identification in demanding industrial, access control, and animal ID applications where reliability, tamper resistance, and backward compatibility are mandatory.
FAQ
What is the primary function of the HT2DC20S20/F,122 in a contactless system?
The HT2DC20S20/F,122 serves as a secure, battery-free RFID transponder that enables bidirectional communication with a 125 kHz reader via magnetic coupling. It stores and authenticates identity data using either password-based or 48-bit encrypted exchange, and supports three public read-only emulation modes. Its role is to provide tamper-resistant identification while maintaining compatibility with legacy infrastructure - a capability confirmed in its Product Specification Rev. 3.0.
Does the HT2DC20S20/F,122 require an external power source or battery?
No, the HT2DC20S20/F,122 derives all operating power from the magnetic field generated by the reader's antenna at 125 kHz - it contains no internal battery or energy storage. This passive operation is fundamental to its design and explicitly stated in Section 2 ("GENERAL DESCRIPTION") of the official specification, enabling maintenance-free deployment in sealed or implantable form factors.
How is memory protection implemented on the HT2DC20S20/F,122?
Memory protection on the HT2DC20S20/F,122 is enforced via a Configuration Byte located in Page 3, where Bit 6 (OTP) permanently locks Page 3 against writes, and Bit 7 (OTP) permanently locks Pages 1–2. These bits are irreversible once set - a hardware-enforced security mechanism documented in Section 5.2.3. User data in Pages 4–7 can be configured as read/write or read-only per group, but only before OTP bits are programmed.
Can the HT2DC20S20/F,122 be used as a direct replacement for older read-only transponders?
Yes - the HT2DC20S20/F,122 natively emulates three legacy formats: Public Mode A (µEM H400x), Public Mode B (ISO 11784/11785), and Public Mode C (PCF793X-compatible), all using cyclic transmission of user memory pages. This emulation requires no reader modification and is fully specified in Sections 5.2.1 and 4 (Quick Reference Data), making it a seamless drop-in upgrade path for existing installations.
What are the environmental operating limits for the HT2DC20S20/F,122?
The HT2DC20S20/F,122 is rated for continuous operation from -40 °C to +85 °C and storage from -55 °C to +125 °C. Its epoxy resin housing achieves IP67 ingress protection, and it withstands 1500 g mechanical shock (IEC 68-2-27) and 20 g vibration (IEC 68-2-6). These values are guaranteed per Section 6.2 (Limiting Values) and Section 7 (Mechanical Characteristics) of the official specification.
HT2DC20S20/F,122 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- HITAG® 2
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Style:
- Encapsulated
- Technology:
- Passive
- Frequency:
- 125kHz
- Memory Type:
- Read/Write
- Writable Memory:
- 256b (User)
- Standards:
- ISO 11784, ISO 11785
- Operating Temperature:
- -40°C ~ 85°C
- Size / Dimension:
- 0.469" L x 0.232" W (11.90mm x 5.90mm)
HT2DC20S20/F,122 FAQ
1.How can I place an order for HT2DC20S20/F,122 through Aetrix?
Please submit a Request for Quotation (RFQ) for HT2DC20S20/F,122 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 HT2DC20S20/F,122 reliable?
The price and inventory of HT2DC20S20/F,122 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HT2DC20S20/F,122 is usually 5 days.
3.What payment methods are accepted for HT2DC20S20/F,122?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HT2DC20S20/F,122 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HT2DC20S20/F,122?
HT2DC20S20/F,122 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HT2DC20S20/F,122 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 HT2DC20S20/F,122?
For technical support, including HT2DC20S20/F,122 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HT2DC20S20/F,122 requirements.
6.How does Aetrix verify that HT2DC20S20/F,122 is sourced from the original manufacturer or authorized distributors?
All HT2DC20S20/F,122 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 HT2DC20S20/F,122 meets industry standards.
7.What is the process for return or replacement of HT2DC20S20/F,122?
All HT2DC20S20/F,122 units undergo pre-shipment inspection (PSI). If there is an issue with HT2DC20S20/F,122, 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 HT2DC20S20/F,122 part is unused and in its original packaging.
Return procedure for HT2DC20S20/F,122:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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