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NXP Semiconductors PCA8581CT/6,112
- Part No.:
- PCA8581CT/6,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Memory
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
PCA8581CT/6,112.pdf
- Description:
- IC EEPROM 1KBIT I2C 100KHZ 8SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,460
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Product details
Overview
PCA8581CT/6,112 from NXP Semiconductors (formerly Philips) is a 128 × 8-bit I²C-bus EEPROM in SO8 package, operating from 2.5 V to 6.0 V, featuring integrated voltage multiplier for write operations, 8-byte page write mode, and hardware address pins A0–A2 for up to 8-device bus addressing. It delivers 10 µA standby current, 7–10 ms write time, and 10-year data retention-used in industrial control panels for configuration storage and calibration parameter backup.
For engineers reviewing the PCA8581CT/6,112 datasheet, PCA8581CT/6,112 pinout, PCA8581CT/6,112 application, or PCA8581CT/6,112 equivalent, this page provides verified electrical parameters, validated I²C timing compliance (100 kHz max), confirmed SO8 package dimensions (SOT96-1), and real-world use cases including power-up configuration loading and firmware revision tracking in embedded systems.
Technical Context
The PCA8581CT/6,112 implements a fully self-contained I²C slave EEPROM architecture with on-chip voltage multiplier enabling write operations without external high-voltage supply. Its word address register auto-increments during sequential read/write, and internal row latching ensures all 8-byte page writes occur within a single row.
Hardware address resolution uses three dedicated pins (A0–A2), defining a 3-bit slave address prefix '1010' per I²C protocol-enabling multi-device bus topology without address conflicts. The TEST pin is a dedicated test output, electrically isolated from VDD and SCL/SDA to prevent bus interference during device power-down.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory size | 128 × 8-bit (1 KB total); sufficient for storing boot configuration, sensor calibration tables, or device ID strings in space-constrained designs. |
| Supply voltage range | 2.5 V to 6.0 V; supports direct interface with 3.3 V and 5 V microcontrollers without level-shifting circuitry. |
| Standby current | Max 10 µA at 0 Hz SCL; enables ultra-low-power operation in battery-backed or energy-harvesting systems. |
| Write time | 7–10 ms per page; deterministic erase-before-write cycle eliminates need for external write-protection logic. |
| I²C clock frequency | Up to 100 kHz; compliant with standard-mode I²C specification, ensuring interoperability with legacy MCU peripherals. |
| Data retention | Minimum 10 years at −65 °C to +85 °C; validated for long-term deployment in industrial temperature environments. |
| Write endurance | ≥10,000 cycles per byte; suitable for infrequent but critical updates such as firmware version stamps or security keys. |
Pinout & Package
PCA8581CT/6,112 is housed in an SO8 plastic small outline package (SOT96-1), 3.9 mm body width, 1.27 mm lead pitch, with gull-wing leads compatible with reflow and wave soldering per JEDEC MS-012AA.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0 | Hardware address input 0 | Defines LSB of 3-bit slave address; tied to VDD or VSS to select one of eight possible I²C addresses (1010xxxR/W). |
| A1 | Hardware address input 1 | Mid-bit of hardware address; enables concurrent use of multiple PCA8581CT/6,112 devices on same I²C bus without software arbitration. |
| A2 | Hardware address input 2 | MSB of hardware address; combined with A0/A1, forms full 3-bit address field for device selection. |
| VSS | Negative supply | Ground reference for internal logic and memory array; must be connected directly to system ground plane. |
| SDA | Serial data I/O | Open-drain bidirectional I²C data line; requires external pull-up resistor (typically 2.2–10 kΩ) to VDD. |
| SCL | Serial clock input | Open-drain I²C clock line driven by master; synchronizes all data transfers and ACK/NACK timing. |
| TEST | Test output | Isolated diagnostic pin; may be connected to VSS, VDD, or left open-no functional role in normal operation. |
| VDD | Positive supply | Primary power input (2.5–6.0 V); powers internal voltage multiplier, memory array, and I²C interface logic. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated voltage multiplier | Eliminates need for external high-voltage generator during write cycles-reduces BOM count and PCB footprint. |
| Automatic erase-before-write | Ensures data integrity without host-side erase commands; simplifies firmware implementation and prevents partial-write corruption. |
| 8-byte page write mode | Reduces average write time per byte by ~8× versus byte-wise writes-critical for minimizing I²C bus occupation in real-time systems. |
| Hardware address pins (A0–A2) | Enables up to eight identical PCA8581CT/6,112 devices on one I²C bus without address conflict or software remapping. |
| Diode-isolated SCL/SDA | Prevents back-powering from I²C bus when VDD is off-supports hot-swap and partial-power-down system architectures. |
Applications
| Industrial Control Panel Configuration | Embedded System Boot Parameter Storage |
|---|---|
|
Use Scenario: Storing user-defined setpoints, alarm thresholds, and display language preferences in PLC-mounted HMI units. IC Role / Device Role / Timing Role: Non-volatile configuration register accessed during power-on initialization via I²C master MCU. Use Value: Enables field-reprogrammable settings without firmware update; retains values across 10+ years of operation and 10,000+ power cycles. |
Use Scenario: Holding bootloader-validated firmware checksums, secure boot keys, and hardware revision IDs in medical IoT gateways. IC Role / Device Role / Timing Role: Secure, low-power I²C slave providing authenticated startup parameters before main application execution. Use Value: Supports tamper-resistant boot integrity checks using factory-programmed data; operates reliably at 3.3 V with <10 µA quiescent draw. |
| Power Meter Calibration Data Archive | Automotive Body Control Module Settings |
|
Use Scenario: Archiving meter-specific gain/offset coefficients and phase calibration constants after factory calibration. IC Role / Device Role / Timing Role: Write-once-read-many (WORM)-like storage accessed only during calibration procedure or firmware upgrade. Use Value: Guarantees traceable, unalterable calibration records with 10-year retention-even under −25 °C to +85 °C ambient cycling. |
Use Scenario: Retaining seat position memory, mirror angle presets, and lighting profiles across vehicle ignition cycles. IC Role / Device Role / Timing Role: Low-power I²C EEPROM interfaced to BCM microcontroller for persistent user preference storage. Use Value: Delivers <10 µA standby draw to meet automotive ISO 16750-2 quiescent current requirements; withstands 10,000+ write cycles over vehicle lifetime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar I²C EEPROM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AT24C01C-SSHM-T | 1 Kbit (128 × 8), 1.7–5.5 V supply, 1 MHz I²C, no internal voltage multiplier-requires external 5 V for write if VDD < 4.5 V. | Lacks integrated voltage multiplier; unsuitable for 2.5–3.3 V-only systems requiring autonomous write capability. | Select when higher-speed I²C (1 MHz) is required and system can guarantee ≥4.5 V during write operations. |
| M95010-WMN6TP | 1 Kbit SPI interface, 2.5–5.5 V, 10 MHz SPI clock, no I²C compatibility-requires different MCU peripheral and driver stack. | Uses SPI instead of I²C; incompatible with existing I²C bus infrastructure and firmware drivers. | Choose only when migrating to SPI-based architecture or when I²C bus congestion necessitates dedicated serial interface. |
Compared with AT24C01C-SSHM-T and M95010-WMN6TP, the PCA8581CT/6,112 uniquely combines wide-voltage write autonomy (2.5–6.0 V), I²C-native interface, and proven 10-year retention-making it optimal for legacy I²C designs where pin count, firmware simplicity, and guaranteed low-voltage write functionality are critical.
Availability
PCA8581CT/6,112 is available at Aetrix Electronics and suitable for industrial control panels, embedded system boot parameter storage, and power meter calibration data archiving requiring stable component supply and long-lifecycle support.
Supply support for PCA8581CT/6,112 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 (originally Philips Semiconductors) is a global leader in high-performance mixed-signal ICs, with expertise in connectivity, security, and power management solutions.
The PCA8581CT/6,112 belongs to NXP's legacy I²C EEPROM product line, designed specifically for reliable, low-power non-volatile storage in industrial, automotive, and consumer systems requiring simple two-wire interface and robust data retention.
FAQ
What is the maximum I²C clock frequency supported by the PCA8581CT/6,112?
The PCA8581CT/6,112 supports standard-mode I²C operation up to 100 kHz, as specified in its AC characteristics table. This frequency is validated across the full operating voltage range (2.5–6.0 V) and temperature range (−25 °C to +85 °C). Exceeding 100 kHz may result in timing violations during ACK generation or data setup/hold, and is not guaranteed by the PCA8581CT/6,112 datasheet.
Does the PCA8581CT/6,112 require external components for write operations?
No-the PCA8581CT/6,112 integrates a voltage multiplier and write timer, eliminating the need for external high-voltage generators or timing capacitors. All write functions-including automatic erase-before-write-are self-contained. Only standard I²C pull-up resistors on SDA and SCL are required for basic operation.
How many PCA8581CT/6,112 devices can share the same I²C bus?
Up to eight PCA8581CT/6,112 devices can operate concurrently on a single I²C bus, enabled by the three hardware address pins (A0, A1, A2). Each combination of VDD/VSS ties produces a unique 3-bit address appended to the fixed prefix '1010', yielding eight distinct slave addresses (1010000R/W through 1010111R/W).
What is the write endurance specification for the PCA8581CT/6,112?
The PCA8581CT/6,112 is rated for a minimum of 10,000 write cycles per memory byte. This endurance is measured under standard conditions (VDD = 5 V, Tamb = 25 °C) and applies to both single-byte and 8-byte page writes. Endurance remains valid across the full specified operating voltage and temperature range.
Is the TEST pin on the PCA8581CT/6,112 required for normal operation?
No-the TEST pin on the PCA8581CT/6,112 is a dedicated test output with no functional role during standard I²C read/write operations. It may be safely connected to VSS, VDD, or left open-circuited. Its purpose is limited to factory testing and does not affect PCA8581CT/6,112 behavior in deployed systems.
PCA8581CT/6,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Non-Volatile
- Memory Format:
- EEPROM
- Technology:
- EEPROM
- Memory Size:
- 1Kbit
- Memory Organization:
- 128 x 8
- Memory Interface:
- I2C
- Clock Frequency:
- 100 kHz
- Write Cycle Time - Word, Page:
- 10ms
- Access Time:
- -
- Voltage - Supply:
- 2.5V ~ 6.0V
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 8-SO
PCA8581CT/6,112 FAQ
1.How can I place an order for PCA8581CT/6,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for PCA8581CT/6,112 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 PCA8581CT/6,112 reliable?
The price and inventory of PCA8581CT/6,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8581CT/6,112 is usually 5 days.
3.What payment methods are accepted for PCA8581CT/6,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8581CT/6,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for PCA8581CT/6,112?
PCA8581CT/6,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your PCA8581CT/6,112 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 PCA8581CT/6,112?
For technical support, including PCA8581CT/6,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8581CT/6,112 requirements.
6.How does Aetrix verify that PCA8581CT/6,112 is sourced from the original manufacturer or authorized distributors?
All PCA8581CT/6,112 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 PCA8581CT/6,112 meets industry standards.
7.What is the process for return or replacement of PCA8581CT/6,112?
All PCA8581CT/6,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA8581CT/6,112, 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 PCA8581CT/6,112 part is unused and in its original packaging.
Return procedure for PCA8581CT/6,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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