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NXP Semiconductors PCA8581T/6,118

Name: PCA8581T/6,118
Brand: NXP Semiconductors
SKU: PCA8581T/6,118
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: PCA8581T/6,118

Manufacturer:: NXP Semiconductors

Category:: Memory

Package:: 8-SOIC (0.154", 3.90mm Width)

Datasheet:: PCA8581T/6,118.pdf

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

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Product details

Overview

PCA8581T/6,118 from NXP Semiconductors (formerly Philips) is a 128 × 8-bit I²C-bus EEPROM in SO8 package, operating at 4.5–5.5 V, with integrated voltage multiplier and timer for autonomous write operations, 8-byte page write mode, and hardware address pins A0–A2 enabling up to 8 devices on one bus. It is used for non-volatile parameter storage in industrial control modules requiring low-power, reliable data retention.

For engineers reviewing the PCA8581T/6,118 datasheet, PCA8581T/6,118 pinout, PCA8581T/6,118 application, or PCA8581T/6,118 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, and two confirmed alternative parts - all grounded in the official 1997 Philips product specification.

Technical Context

The PCA8581T/6,118 implements a fully self-contained I²C slave EEPROM architecture with automatic erase-before-write, built-in word address register that auto-increments during sequential reads/writes, and internal voltage multiplier eliminating external charge-pump components. Its I²C interface complies with standard protocol timing (f_SCL ≤ 100 kHz), supports START/STOP conditions, and uses ACK-based handshaking for reliable byte transfer.

Hardware addressing via A0–A2 pins defines the three LSBs of the 7-bit slave address (fixed prefix '1010'), allowing multi-device bus topology without address conflicts. The TEST pin is a dedicated test output, configurable to VSS, VDD, or open-circuit - not used in normal operation but critical for factory verification.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory size	128 × 8-bit (1 KB total); sufficient for calibration tables, device IDs, or configuration registers in compact embedded systems.
Supply voltage	4.5–5.5 V; compatible with standard 5 V logic rails and legacy industrial power domains.
Standby current	≤10 µA; enables battery-backed operation for >10 years in low-power monitoring nodes.
I²C clock frequency	Up to 100 kHz; matches standard-mode I²C controllers without requiring high-speed peripherals.
Write time (t_WR)	7–10 ms per page; deterministic timing allows precise host firmware scheduling of write completion polling.
Data retention	≥10 years; guaranteed non-volatile storage under −65 to +85 °C ambient, suitable for unattended field deployments.
Endurance	≥10,000 write cycles per byte; supports frequent recalibration or logging in programmable logic controllers.

Pinout & Package

PCA8581T/6,118 is housed in an SO8 plastic small outline package (SOT96-1), 3.9 mm body width, 1.27 mm lead pitch, surface-mount compatible with reflow and wave soldering per JEDEC MS-012AA.

Pin/Terminal	Circuit Role	Design Meaning
A0	Hardware address input 0	Defines bit 0 of 3-bit user-configurable slave address; tied HIGH/LOW to select one of eight possible I²C addresses on shared bus.
A1	Hardware address input 1	Defines bit 1 of 3-bit user-configurable slave address; enables multi-drop topology without software address remapping.
A2	Hardware address input 2	Defines bit 2 of 3-bit user-configurable slave address; combined with A0/A1, supports up to eight identical PCA8581T/6,118 devices on same I²C segment.
VSS	Negative supply (ground)	Reference return path for all internal circuitry; must be connected directly to system ground plane to ensure noise immunity.
SDA	Serial data I/O (bidirectional, open-drain)	I²C data line; requires external pull-up resistor; carries address, command, and data bytes with ACK/NACK signaling.
SCL	Serial clock input (open-drain)	I²C clock line; driven by master only; synchronizes all data transfers; requires external pull-up resistor.
TEST	Test output	Factory test signal; not used in application circuits; may be left open, tied to VSS, or tied to VDD per test requirements.
VDD	Positive supply (4.5–5.5 V)	Power rail for EEPROM core and I²C interface; internal voltage multiplier derives programming voltage - no external components needed.

Key Features

Feature	Design Value
Integrated voltage multiplier	Eliminates need for external charge-pump IC or high-voltage generator, reducing BOM count and PCB area in space-constrained designs.
Automatic erase-before-write	Ensures data integrity without host firmware intervention; prevents partial writes or bit corruption during power loss.
8-byte page write mode	Reduces total write time vs. byte-by-byte writes; improves efficiency when updating contiguous configuration blocks.
Hardware address pins (A0–A2)	Enables plug-and-play multi-device deployment on single I²C bus - no software address assignment required.
Infinite read cycles	Supports continuous status polling or real-time parameter lookup without wear-out concerns in HMI or sensor interface applications.

Applications

Industrial Sensor Calibration	Embedded System Configuration
Use Scenario: Storing temperature compensation coefficients and sensor offset values in a factory-calibrated pressure transducer. IC Role / Device Role / Timing Role: Non-volatile parameter storage with infrequent writes and frequent reads; retains data across power cycles. Use Value: Enables field-replaceable sensors with pre-loaded calibration data, eliminating host-side computation and reducing startup latency.	Use Scenario: Holding boot configuration flags, network MAC address, and firmware version in a programmable logic controller (PLC) module. IC Role / Device Role / Timing Role: I²C slave EEPROM providing persistent settings accessible during cold start and runtime updates. Use Value: Allows firmware-independent configuration management; supports remote reprogramming without reflashing main MCU.
Power Meter Parameter Storage	Consumer Appliance Settings Retention
Use Scenario: Recording tariff schedules, pulse constants, and metering thresholds in a DIN-rail mounted electricity meter. IC Role / Device Role / Timing Role: Low-power, long-retention memory for regulatory-compliant energy data; written only during commissioning or firmware update. Use Value: Meets IEC 62056 requirements for tamper-resistant, decade-long data persistence without backup batteries.	Use Scenario: Saving user preferences (e.g., cooking time, temperature, language) in a smart microwave oven after power interruption. IC Role / Device Role / Timing Role: I²C-connected non-volatile memory accessed by main MCU during initialization and UI interaction. Use Value: Delivers seamless user experience with instant recall of settings - no manual reconfiguration needed after AC dropout.

Industrial Sensor Calibration

Embedded System Configuration

Use Scenario: Storing temperature compensation coefficients and sensor offset values in a factory-calibrated pressure transducer.

IC Role / Device Role / Timing Role: Non-volatile parameter storage with infrequent writes and frequent reads; retains data across power cycles.

Use Value: Enables field-replaceable sensors with pre-loaded calibration data, eliminating host-side computation and reducing startup latency.

Use Scenario: Holding boot configuration flags, network MAC address, and firmware version in a programmable logic controller (PLC) module.

IC Role / Device Role / Timing Role: I²C slave EEPROM providing persistent settings accessible during cold start and runtime updates.

Use Value: Allows firmware-independent configuration management; supports remote reprogramming without reflashing main MCU.

Power Meter Parameter Storage

Consumer Appliance Settings Retention

Use Scenario: Recording tariff schedules, pulse constants, and metering thresholds in a DIN-rail mounted electricity meter.

IC Role / Device Role / Timing Role: Low-power, long-retention memory for regulatory-compliant energy data; written only during commissioning or firmware update.

Use Value: Meets IEC 62056 requirements for tamper-resistant, decade-long data persistence without backup batteries.

Use Scenario: Saving user preferences (e.g., cooking time, temperature, language) in a smart microwave oven after power interruption.

IC Role / Device Role / Timing Role: I²C-connected non-volatile memory accessed by main MCU during initialization and UI interaction.

Use Value: Delivers seamless user experience with instant recall of settings - no manual reconfiguration needed after AC dropout.

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	1 Kbit capacity, same 128×8 organization; operates at 1.8–5.5 V; lacks integrated voltage multiplier - requires external V_PP or higher V_CC for write.	Broader supply range suits battery-powered devices; but needs additional support circuitry for 3.3 V systems without charge pump.	Select when wider voltage flexibility is critical and board space permits external components.
ST M24C01-WMN6TP	1 Kbit I²C EEPROM; 2.5–5.5 V operation; includes write protection via WP pin; no internal voltage multiplier.	Hardware write-protection enhances safety in safety-critical firmware update paths; requires external pull-up on WP for default-enable behavior.	Prefer where robustness against accidental writes outweighs simplicity of autonomous write capability.

Compared with PCA8581T/6,118, AT24C01A-PU offers wider voltage range but adds design complexity, while ST M24C01-WMN6TP provides hardware write protection at the cost of losing integrated voltage multiplication - making PCA8581T/6,118 optimal for 5 V systems prioritizing minimal external components and deterministic write timing.

Availability

PCA8581T/6,118 is available at Aetrix Electronics and suitable for industrial sensor calibration, embedded system configuration, and power meter parameter storage requiring stable component supply across extended production lifecycles.

Supply support for PCA8581T/6,118 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 analog and mixed-signal ICs, with deep expertise in interface, memory, and automotive-grade components.

The PCA8581T/6,118 belongs to Philips' early I²C EEPROM family designed specifically for robust, low-pin-count non-volatile storage in industrial and instrumentation applications where reliability, long data retention, and simple integration are essential.

FAQ

What is the maximum I²C clock frequency supported by the PCA8581T/6,118?

The PCA8581T/6,118 supports I²C standard-mode operation up to 100 kHz, as specified in its AC characteristics table. This aligns with legacy microcontroller I²C peripherals and ensures compatibility with widely deployed embedded hosts without requiring high-speed timing adjustments. Exceeding 100 kHz may result in unreliable communication or write failures.

Does the PCA8581T/6,118 require external components for write operations?

No - the PCA8581T/6,118 integrates a voltage multiplier and internal timer, eliminating the need for external charge-pump circuits or high-voltage generators. This allows full write functionality using only the standard 4.5–5.5 V supply, simplifying design and reducing bill-of-materials cost compared to basic EEPROMs requiring V_PP.

How many PCA8581T/6,118 devices can share the same I²C bus?

Up to eight PCA8581T/6,118 devices can coexist on a single I²C bus, enabled by the three hardware address pins A0, A1, and A2. Each combination of HIGH/LOW on these pins sets a unique 3-bit address suffix, resulting in distinct 7-bit slave addresses (prefix '1010' + A2A1A0), avoiding bus contention.

What is the guaranteed data retention period for the PCA8581T/6,118?

The PCA8581T/6,118 guarantees ≥10 years of non-volatile data retention when stored within −65 to +85 °C, as confirmed in the DC Characteristics section. This applies to data written under specified conditions and retained without power, meeting long-term archival requirements in unattended industrial equipment.

Is the TEST pin on the PCA8581T/6,118 required for normal operation?

No - the TEST pin is exclusively for factory testing and is not used during functional operation. Per the datasheet, it may be left open-circuit, tied to VSS, or tied to VDD depending on test setup; no connection is needed in end-application circuits, and leaving it unconnected poses no operational risk.

PCA8581T/6,118 Specifications

Product attributes: Attribute value

Manufacturer:: NXP Semiconductors

Series:: -

Package/Case:: 8-SOIC (0.154", 3.90mm Width)

Packaging:: Tape & Reel (TR)

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:: Surface Mount

Supplier Device Package:: 8-SO

PCA8581T/6,118 FAQ

1.How can I place an order for PCA8581T/6,118 through Aetrix?

Please submit a Request for Quotation (RFQ) for PCA8581T/6,118 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 PCA8581T/6,118 reliable?

The price and inventory of PCA8581T/6,118 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for PCA8581T/6,118 is usually 5 days.

3.What payment methods are accepted for PCA8581T/6,118?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for PCA8581T/6,118 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for PCA8581T/6,118?

PCA8581T/6,118 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your PCA8581T/6,118 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 PCA8581T/6,118?

For technical support, including PCA8581T/6,118 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your PCA8581T/6,118 requirements.

6.How does Aetrix verify that PCA8581T/6,118 is sourced from the original manufacturer or authorized distributors?

All PCA8581T/6,118 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 PCA8581T/6,118 meets industry standards.

7.What is the process for return or replacement of PCA8581T/6,118?

All PCA8581T/6,118 units undergo pre-shipment inspection (PSI). If there is an issue with PCA8581T/6,118, 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 PCA8581T/6,118 part is unused and in its original packaging.

Return procedure for PCA8581T/6,118:

1.Submit a request within 90 days.

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

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