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Analog Devices Inc./Maxim Integrated DS2431P-A1+
- Part No.:
- DS2431P-A1+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Memory
- Package:
- 6-SMD, J-Lead
- Datasheet:
-
DS2431P-A1+.pdf
- Description:
- IC EEPROM 1KBIT 1-WIRE 6TSOC
- Quantity:
- Payment:
- Shipping:
Inventory:240
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Product details
Overview
DS2431P-A1+ from Analog Devices is an AEC-Q100 Grade 1 qualified 1-Wire EEPROM IC for automotive identification and calibration storage. It provides 1024-bit nonvolatile memory partitioned into four 256-bit pages, supports individual page write protection and EPROM-emulation mode (write-to-0), operates from -40°C to +125°C, and communicates via single-conductor 1-Wire bus at 15.4kbps.
For engineers reviewing the DS2431P-A1+ datasheet, DS2431P-A1+ pinout, DS2431P-A1+ application, or DS2431P-A1+ equivalent, this page delivers verified electrical parameters, automotive-grade reliability context, 1-Wire timing constraints, TSOC-6 package mapping, and real-world use cases in sensor/cable/PCB identification systems.
Technical Context
The DS2431P-A1+ implements a parasitically powered 1-Wire slave interface with open-drain I/O requiring external pullup. Its internal architecture includes a 64-bit lasered ROM for unique device identity, 8-byte scratchpad buffer, four 32-byte EEPROM pages, and 64-bit register page with protection control bytes.
Memory writes follow a two-step process: data is first written to the scratchpad and verified, then copied to EEPROM using a self-timed 10ms programming cycle. Protection modes-write-protect (55h) and EPROM-emulation (AAh)-are configured per page via dedicated register bytes and persist after power loss.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory capacity | 1024 bits (four 256-bit pages), enabling storage of calibration coefficients, serial IDs, or manufacturing traceability data per device. |
| Operating temperature | -40°C to +125°C, meeting AEC-Q100 Grade 1 requirements for under-hood automotive environments. |
| 1-Wire interface speed | 15.4kbps maximum bit rate, with defined time slot (65µs), reset (480–640µs), and presence-detect timing for robust noise immunity. |
| EEPROM endurance | 1k write/erase cycles at +125°C, 50k at +85°C, and 200k at +25°C - critical for infrequent but mission-critical updates. |
| Data retention | 10 years at +125°C, ensuring long-term integrity of stored calibration or identification data without refresh. |
| ESD protection | IEC 1000-4-2 Level 4: ±8kV contact / ±15kV air - validated for harsh automotive assembly and service conditions. |
| Supply range | 4.5V to 5.25V VPUP, compatible with standard 5V automotive microcontroller I/O domains. |
Pinout & Package
DS2431P-A1+ is housed in a 6-pin TSOC (Thin Small Outline Package) with exposed pad, optimized for space-constrained automotive PCBs and reflow-compatible assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | GND | Ground reference for internal circuitry and 1-Wire signal return path. |
| 2 | I/O | Open-drain 1-Wire bus interface; requires external pullup resistor (0.3–2.2kΩ) and supports parasitic power mode. |
| 3–6 | N.C. | No internal connection; must remain unconnected on PCB to avoid signal coupling or ESD path disruption. |
Key Features
| Feature | Design Value |
|---|---|
| Individual page write protection | Each of four 256-bit pages can be permanently locked (55h) to prevent accidental overwrites during field operation or diagnostics. |
| EPROM-emulation mode | Page-level "write-to-0" behavior (AAh) enables one-time programmable (OTP)-like functionality for firmware version stamps or security keys. |
| Switchpoint hysteresis | 0.21–1.70V hysteresis on I/O thresholds improves noise margin in electrically noisy automotive harnesses and chassis-grounded systems. |
| Factory-lasered 64-bit ROM | Unalterable unique ID (8-bit family code + 48-bit serial + 8-bit CRC) ensures absolute traceability across supply chain and vehicle lifecycle. |
| Scratchpad verification workflow | Two-step write (load → verify → copy) prevents corrupted EEPROM updates due to bus glitches or power droop during programming. |
Applications
| Automotive Sensor Calibration | Vehicle Cable Assembly ID |
|---|---|
|
Use Scenario: Storing temperature-compensated offset/gain coefficients for engine coolant or exhaust gas sensors during final test. IC Role / Device Role / Timing Role: Nonvolatile calibration data host with guaranteed uniqueness and AEC-Q100 Grade 1 reliability. Use Value: Eliminates manual calibration records and enables plug-and-play sensor replacement with zero reprogramming. |
Use Scenario: Embedding unique cable harness identifiers in HVAC, lighting, or ADAS wiring assemblies for automated line-side verification. IC Role / Device Role / Timing Role: Tamper-resistant identification node on 1-Wire bus, readable by factory test equipment during harness build. Use Value: Prevents incorrect harness installation and enables full traceability from supplier to OEM assembly line. |
| Aftermarket Accessory Authentication | ECU PCB Traceability |
|
Use Scenario: Verifying OEM compliance of replacement head units, cameras, or radar modules before enabling full feature set. IC Role / Device Role / Timing Role: Secure identity anchor tied to accessory hardware, queried during boot sequence via 1-Wire. Use Value: Blocks counterfeit parts while supporting field-upgradable authentication keys via protected EEPROM pages. |
Use Scenario: Recording PCB revision, build date, and test station ID directly onto engine control unit boards during SMT production. IC Role / Device Role / Timing Role: Permanent board-level serialization element, accessible via diagnostic port without disassembly. Use Value: Enables root-cause analysis of field failures by correlating hardware revisions with software versions and warranty claims. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 1-Wire EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DS2431P+ | Industrial temperature range (-40°C to +85°C); lacks AEC-Q100 Grade 1 qualification and extended high-temp endurance. | Suitable for non-automotive industrial or consumer systems where ambient temperature stays below +85°C. | Select DS2431P+ only if automotive qualification and +125°C operation are not required. |
| MAX31826ATM+ | Integrated ±2°C digital temperature sensor + 1024-bit EEPROM in same TSOC-6 package; shares 1-Wire interface but adds sensing function. | Used when both temperature monitoring and identification storage are needed on same node (e.g., battery pack thermistor). | Choose MAX31826ATM+ when co-located sensing and ID storage reduce BOM count and wiring complexity. |
Compared with DS2431P-A1+, DS2431P+ offers identical memory architecture and 1-Wire protocol but omits automotive qualification and high-temp reliability margins, while MAX31826ATM+ trades pure EEPROM functionality for integrated temperature sensing - making DS2431P-A1+ the optimal choice for cost-sensitive, high-reliability automotive ID-only use cases.
Availability
DS2431P-A1+ is available at Aetrix Electronics and suitable for automotive sensor calibration, cable assembly identification, and ECU PCB traceability requiring stable component supply across multi-year vehicle production programs.
Supply support for DS2431P-A1+ 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
Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, serving automotive, industrial, and communications markets with precision, reliability, and longevity.
The DS2431P-A1+ belongs to Analog Devices' 1-Wire automotive EEPROM product line, designed specifically to meet AEC-Q100 Grade 1 requirements for identification, calibration, and traceability in harsh-temperature automotive subsystems.
FAQ
What is the operating voltage range for DS2431P-A1+?
The DS2431P-A1+ operates with a 1-Wire pullup voltage (VPUP) of 4.5V to 5.25V across its full -40°C to +125°C temperature range. This matches standard 5V automotive microcontroller I/O domains and ensures reliable communication without external level-shifting circuitry. The DS2431P-A1+ draws no VCC supply - it is parasitically powered from the I/O line during active communication.
How does DS2431P-A1+ implement write protection per memory page?
The DS2431P-A1+ uses dedicated protection control bytes at addresses 0080h–0083h to configure each of its four 256-bit pages independently. Writing 55h to a control byte locks that page against all future writes; writing AAh enables EPROM-emulation mode (bitwise AND on write). Once set, these protection states persist through power cycles and cannot be reversed - ensuring permanent data integrity for calibration or ID fields.
Is DS2431P-A1+ pin-compatible with the standard DS2431P+?
Yes, DS2431P-A1+ and DS2431P+ share identical TSOC-6 pinout (GND, I/O, N.C., N.C., N.C., N.C.), same footprint, and identical 1-Wire electrical interface. However, DS2431P-A1+ is qualified to AEC-Q100 Grade 1 and specified for operation up to +125°C, whereas DS2431P+ is rated only to +85°C and lacks automotive qualification - making them mechanically compatible but not functionally interchangeable in automotive applications.
What is the purpose of the scratchpad in DS2431P-A1+?
The DS2431P-A1+ includes an 8-byte volatile scratchpad used as a write buffer. Before committing data to EEPROM, users first write to the scratchpad, read it back to verify correctness, then issue a Copy Scratchpad command to transfer verified data. This two-step process prevents corruption from bus noise or power interruption during programming - a critical safeguard for mission-critical automotive calibration data stored in DS2431P-A1+.
Does DS2431P-A1+ support parasitic power mode?
Yes, DS2431P-A1+ fully supports parasitic power mode: it draws operating current from the 1-Wire I/O line during active communication, eliminating the need for a separate VCC connection. In this mode, the external pullup resistor must supply sufficient current (≥0.8mA during programming) while maintaining VPUP ≥4.5V. The DS2431P-A1+ datasheet specifies RPUP ≤2.2kΩ for single-device systems to ensure reliable parasitic operation.
DS2431P-A1+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 6-SMD, J-Lead
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 256 x 4
- Memory Interface:
- 1-Wire®
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- -
- Access Time:
- 2 µs
- Voltage - Supply:
- -
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 6-TSOC
DS2431P-A1+ FAQ
1.How can I place an order for DS2431P-A1+ through Aetrix?
Please submit a Request for Quotation (RFQ) for DS2431P-A1+ 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 DS2431P-A1+ reliable?
The price and inventory of DS2431P-A1+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DS2431P-A1+ is usually 5 days.
3.What payment methods are accepted for DS2431P-A1+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DS2431P-A1+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DS2431P-A1+?
DS2431P-A1+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DS2431P-A1+ 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 DS2431P-A1+?
For technical support, including DS2431P-A1+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DS2431P-A1+ requirements.
6.How does Aetrix verify that DS2431P-A1+ is sourced from the original manufacturer or authorized distributors?
All DS2431P-A1+ 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 DS2431P-A1+ meets industry standards.
7.What is the process for return or replacement of DS2431P-A1+?
All DS2431P-A1+ units undergo pre-shipment inspection (PSI). If there is an issue with DS2431P-A1+, 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 DS2431P-A1+ part is unused and in its original packaging.
Return procedure for DS2431P-A1+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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