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NXP Semiconductors PCA8581P/F6,112

Name: PCA8581P/F6,112
Brand: NXP Semiconductors
SKU: PCA8581P/F6,112
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCA8581P/F6,112

Manufacturer:: NXP Semiconductors

Category:: Memory

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: PCA8581P/F6,112.pdf

Description:: IC EEPROM 1KBIT I2C 100KHZ 8DIP

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Product details

Overview

PCA8581P/F6,112 from NXP Semiconductors (formerly Philips) is a 128 × 8-bit I²C-bus EEPROM designed for non-volatile data storage in embedded control systems. It operates at 4.5–5.5 V, supports up to 8-byte page writes with 7–10 ms write time, features hardware address pins (A0–A2), and delivers ≤10 µA standby current. It is used in industrial sensor calibration storage and set-point retention in programmable logic controllers.

For engineers reviewing the PCA8581P/F6,112 datasheet, PCA8581P/F6,112 pinout, PCA8581P/F6,112 application, or PCA8581P/F6,112 equivalent, key selection criteria include I²C slave address configuration, 10-year data retention, page-write timing compliance, and DIP8 package compatibility with legacy through-hole PCB layouts.

Technical Context

The PCA8581P/F6,112 implements a serial EEPROM architecture with integrated voltage multiplier and write timer-eliminating external components for write-cycle generation. Its word address register auto-increments during read/write sequences, enabling sequential access across its 128-word memory array.

I²C-bus communication follows standard protocol: START/STOP conditions, 7-bit slave address (1010xxxR/W), ACK-driven byte transfer, and SCL clock frequency up to 100 kHz. The TEST pin is a dedicated test output, configurable to VSS, VDD, or open-circuit-distinct from functional I/O.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	128 × 8-bit (1 KB total); sufficient for firmware patch storage or multi-channel calibration tables.
Supply voltage	4.5–5.5 V; compatible with standard 5 V TTL/CMOS logic rails without level-shifting.
Standby current	≤10 µA; enables low-power operation in battery-backed systems or sleep-mode microcontrollers.
Write time (t_WR)	7–10 ms per page; deterministic erase-before-write ensures data integrity without host-side timeout uncertainty.
I²C clock frequency	Up to 100 kHz; meets standard-mode I²C timing, interoperable with legacy MCU peripherals.
Data retention	Minimum 10 years; validated under −65 to +85 °C storage conditions per specification.
Endurance	≥10,000 write cycles per byte; supports frequent recalibration or logging in field-deployed equipment.

Pinout & Package

PCA8581P/F6,112 uses an 8-lead plastic dual in-line package (DIP8), 300 mil width, outline SOT97-1. Pin 1 is index-marked; body height ≤4.2 mm; lead pitch 2.54 mm.

Pin/Terminal	Circuit Role	Design Meaning
A0	Hardware address input 0	Configures LSB of 7-bit I²C slave address (1010xxxR/W); tied HIGH/LOW to enable up to 8 devices on same bus.
A1	Hardware address input 1	Second bit of hardware address; combined with A0/A2 defines unique device address within I²C network.
A2	Hardware address input 2	MSB of hardware address group; all three pins must be externally terminated-no floating connections permitted.
VSS	Negative supply	Ground reference for internal circuitry and I²C bus pull-up resistors; shared return path for SDA/SCL.
SDA	Serial data I/O	Open-drain bidirectional line; requires external pull-up resistor; handles address, data, and ACK signaling.
SCL	Serial clock input	Master-generated clock; synchronizes all data transfers; no internal pull-up; driven only by master.
TEST	Test output	Dedicated diagnostic node-not used in normal operation; may be connected to VSS/VDD or left open.
VDD	Positive supply	Primary power rail (4.5–5.5 V); powers internal voltage multiplier, memory array, and I²C interface logic.

Key Features

Feature	Design Value
Integrated voltage multiplier	Generates internal high-voltage programming pulse-no external charge pump or capacitor required for write operations.
Automatic erase-before-write	Ensures reliable byte-level updates without host software managing erase cycles or wear leveling.
8-byte page write mode	Reduces total write time vs. byte-by-byte writes; improves throughput in burst data logging applications.
Pin/address compatibility	Direct replacement for PCF8570C and PCF8582 in existing designs-same pinout and I²C addressing scheme.
Wide temperature range	−25 to +85 °C operating ambient; validated for use in industrial control cabinets and outdoor telemetry enclosures.

Applications

Industrial Sensor Calibration Storage	PLC Set-Point Retention
Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in environmental monitoring systems. IC Role / Device Role / Timing Role: Non-volatile configuration memory accessed via I²C during system boot or sensor initialization. Use Value: Eliminates need for external calibration trimmers or reprogramming; maintains accuracy across power cycles and firmware updates.	Use Scenario: Preserving user-defined operational thresholds (e.g., temperature limits, motor speed targets) in programmable logic controllers after power loss. IC Role / Device Role / Timing Role: Persistent parameter store interfaced by PLC CPU over I²C; retains values during brown-out or scheduled shutdown. Use Value: Ensures process continuity and regulatory compliance without requiring manual re-entry of critical settings.
Legacy Equipment Firmware Patch Storage	Power Meter Configuration Backup
Use Scenario: Holding small firmware patches or configuration flags in aging industrial HMIs where flash memory is inaccessible or write-limited. IC Role / Device Role / Timing Role: Read-only or infrequent-write auxiliary memory mapped into microcontroller's I²C peripheral space. Use Value: Extends service life of legacy hardware by enabling field-upgradable behavior without PCB redesign.	Use Scenario: Backing up tariff schedules, CT/PT ratios, and billing parameters in DIN-rail mounted electricity meters. IC Role / Device Role / Timing Role: Tamper-resistant configuration vault; written during commissioning and read at startup. Use Value: Meets IEC 62056 requirements for secure, long-term parameter retention independent of main meter MCU reliability.

Industrial Sensor Calibration Storage

PLC Set-Point Retention

Use Scenario: Storing factory-calibrated offset/gain coefficients for analog sensor front-ends in environmental monitoring systems.

IC Role / Device Role / Timing Role: Non-volatile configuration memory accessed via I²C during system boot or sensor initialization.

Use Value: Eliminates need for external calibration trimmers or reprogramming; maintains accuracy across power cycles and firmware updates.

Use Scenario: Preserving user-defined operational thresholds (e.g., temperature limits, motor speed targets) in programmable logic controllers after power loss.

IC Role / Device Role / Timing Role: Persistent parameter store interfaced by PLC CPU over I²C; retains values during brown-out or scheduled shutdown.

Use Value: Ensures process continuity and regulatory compliance without requiring manual re-entry of critical settings.

Legacy Equipment Firmware Patch Storage

Power Meter Configuration Backup

Use Scenario: Holding small firmware patches or configuration flags in aging industrial HMIs where flash memory is inaccessible or write-limited.

IC Role / Device Role / Timing Role: Read-only or infrequent-write auxiliary memory mapped into microcontroller's I²C peripheral space.

Use Value: Extends service life of legacy hardware by enabling field-upgradable behavior without PCB redesign.

Use Scenario: Backing up tariff schedules, CT/PT ratios, and billing parameters in DIN-rail mounted electricity meters.

IC Role / Device Role / Timing Role: Tamper-resistant configuration vault; written during commissioning and read at startup.

Use Value: Meets IEC 62056 requirements for secure, long-term parameter retention independent of main meter MCU reliability.

Equivalent & Alternatives

The following parts are listed as comparable options for similar I²C EEPROM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AT24C01A-PU	128 × 8-bit capacity, but 1.8–5.5 V supply range; lacks integrated voltage multiplier-requires external VPP or higher VDD for write.	Broader voltage support enables direct use in 3.3 V systems; not drop-in for 5 V-only PCA8581P/F6,112 designs due to different write architecture.	Select when migrating to mixed-voltage systems or when external VPP generation is acceptable.
ST M24C01-RMN6TP	Same 128 × 8-bit density and 4.5–5.5 V range; includes write protection pin (WP) and enhanced ESD rating (4 kV HBM), but no TEST pin.	WP pin enables hardware lock against accidental writes; absence of TEST simplifies layout but removes testability in production diagnostics.	Prefer for new designs requiring robust write protection and higher ESD immunity in harsh industrial environments.

Compared with AT24C01A-PU and ST M24C01-RMN6TP, PCA8581P/F6,112 offers guaranteed 5 V-only operation with self-contained write circuitry-critical for legacy 5 V systems where board space or BOM count precludes external charge pumps or voltage translation.

Availability

PCA8581P/F6,112 is available at Aetrix Electronics and suitable for industrial sensor calibration storage, PLC set-point retention, and legacy equipment firmware patch storage requiring stable component supply and long-term obsolescence management.

Supply support for PCA8581P/F6,112 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, formerly Philips Semiconductors, is a global leader in high-reliability analog and mixed-signal ICs, with deep heritage in I²C protocol development and industrial-grade memory solutions.

The PCA8581P/F6,112 belongs to NXP's legacy I²C EEPROM product line, engineered specifically for cost-sensitive, long-lifecycle industrial control and instrumentation applications requiring proven 5 V compatibility and minimal external components.

FAQ

What is the I²C slave address format for PCA8581P/F6,112?

The PCA8581P/F6,112 uses a fixed 7-bit I²C slave address where bits [7:4] = '1010', bits [3:1] = hardware-configurable A2/A1/A0, and bit [0] = R/W. For example, with A2=A1=A0=0, the write address is 0xA0 (10100000b). This matches the PCF8570C/PCF8582 addressing scheme, ensuring interoperability in existing bus topologies.

Does PCA8581P/F6,112 require external components for write operations?

No. PCA8581P/F6,112 integrates a voltage multiplier and write timer, eliminating the need for external capacitors, charge pumps, or timing resistors. All write cycles-including erase-before-write-are self-contained, reducing BOM count and PCB footprint versus discrete EEPROM solutions.

Can PCA8581P/F6,112 operate at 3.3 V?

No. PCA8581P/F6,112 is specified only for 4.5–5.5 V operation. It is not compatible with 3.3 V I²C buses unless level-shifted. For 3.3 V systems, consider the PCA8581C variant (2.5–6.0 V), but note that PCA8581P/F6,112 is the 5 V-only version and lacks the wider voltage range.

What is the function of the TEST pin on PCA8581P/F6,112?

The TEST pin on PCA8581P/F6,112 is a dedicated test output used during manufacturing verification. It is not functional in normal operation and must be externally connected to VSS, VDD, or left open-circuit-never driven by external logic. It has no role in I²C communication or memory access.

How many write cycles does PCA8581P/F6,112 guarantee per memory location?

PCA8581P/F6,112 guarantees a minimum of 10,000 write cycles per byte. This endurance rating is validated under specified operating conditions (T_amb = −25 to +85 °C, V_DD = 4.5–5.5 V) and supports applications involving periodic calibration updates or infrequent configuration changes over extended field deployment.

PCA8581P/F6,112 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

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:: 4.5V ~ 5.5V

Operating Temperature:: -25°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-DIP

PCA8581P/F6,112 FAQ

1.How can I place an order for PCA8581P/F6,112 through Aetrix?

Please submit a Request for Quotation (RFQ) for PCA8581P/F6,112 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 PCA8581P/F6,112 reliable?

The price and inventory of PCA8581P/F6,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8581P/F6,112 is usually 5 days.

3.What payment methods are accepted for PCA8581P/F6,112?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8581P/F6,112 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCA8581P/F6,112?

PCA8581P/F6,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCA8581P/F6,112 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 PCA8581P/F6,112?

For technical support, including PCA8581P/F6,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8581P/F6,112 requirements.

6.How does Aetrix verify that PCA8581P/F6,112 is sourced from the original manufacturer or authorized distributors?

All PCA8581P/F6,112 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 PCA8581P/F6,112 meets industry standards.

7.What is the process for return or replacement of PCA8581P/F6,112?

All PCA8581P/F6,112 units undergo pre-shipment inspection (PSI). If there is an issue with PCA8581P/F6,112, 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 PCA8581P/F6,112 part is unused and in its original packaging.

Return procedure for PCA8581P/F6,112:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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