NXP Semiconductors PCF85116-3T/01,112

Overview

PCF85116-3T/01 from NXP Semiconductors (formerly Philips) is a 16 kbit (2048 × 8-bit) I²C-bus EEPROM with on-chip voltage multiplier, write-protection input (WP), and fault-tolerant redundant cell architecture. It operates from 2.7 V to 5.5 V, supports 100 kHz standard-mode and 400 kHz fast-mode I²C communication, and delivers ≤1.0 mA read/write current. Used for non-volatile parameter storage in industrial control modules, power supply configuration, and embedded system boot settings.

For engineers reviewing the PCF85116-3T/01 datasheet, PCF85116-3T/01 pinout, PCF85116-3T/01 application, or PCF85116-3T/01 equivalent, key selection criteria include its 8-pin SO package (SOT96-1), hardware write-protection via pin 7, 32-byte page write capability, and 10 ms max write cycle time - all critical for reliable firmware update logging and calibration data retention.

Technical Context

The PCF85116-3T/01 implements an I²C slave interface with fixed 4-bit device identifier '1010', three block-select address bits (B3–B1), and R/W bit - enabling selection of one of eight 256-byte memory blocks. Its internal oscillator and sequencer fully manage write timing without external components.

Redundant EEPROM cells provide single-bit error tolerance and partial multi-bit coverage, significantly improving reliability over conventional EEPROMs. Power-on reset ensures deterministic initialization, while the on-chip voltage multiplier eliminates need for external high-voltage programming circuitry.

Key Specifications

Pinout & Package

PCF85116-3T/01 is housed in an 8-lead plastic small outline package (SO8, SOT96-1) with 3.9 mm body width and 1.27 mm lead pitch. Pins 1–3 are not connected (n.c.), simplifying PCB layout by eliminating unused traces.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AT24C16C-SSHM-T and M95160-DFMN6TP, the PCF85116-3T/01 offers deterministic hardware write protection and proven I²C compatibility with legacy Philips/NXP ecosystem designs, making it optimal for industrial systems where bus simplicity and physical security outweigh raw speed or voltage flexibility.

Availability

PCF85116-3T/01 is available at Aetrix Electronics and suitable for industrial sensor calibration, power supply configuration, and embedded boot configuration requiring stable component supply across extended product lifecycles.

Supply support for PCF85116-3T/01 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 is a global semiconductor company formed from the spin-off of Philips Semiconductors in 2006, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.

The PCF85116-3T/01 belongs to NXP's legacy I²C EEPROM product line, designed specifically for robust, low-power non-volatile storage in resource-constrained embedded systems where hardware write protection and fault-tolerant memory are mandatory.

FAQ

What is the maximum I²C clock frequency supported by the PCF85116-3T/01?

The PCF85116-3T/01 supports I²C standard-mode up to 100 kHz and fast-mode up to 400 kHz. It does not support fast-mode plus (1 MHz) or high-speed mode (3.2 MHz). The device's internal timing and input capacitance (7 pF on SCL) are optimized for reliable operation within these two defined modes, as confirmed in Table 8 of the official datasheet Rev. 04.

How does the write-protection function work on the PCF85116-3T/01?

The PCF85116-3T/01 uses an active-HIGH write-protection input (WP) on pin 7. When WP is driven HIGH (≥0.9×VDD), all write operations - including byte, word, and page writes - are disabled. The device will not acknowledge data bytes sent after the slave address and word address, preventing EEPROM modification. This hardware-level lock operates independently of I²C commands and remains effective across power cycles.

Is the PCF85116-3T/01 pin-compatible with other members of the PCF85xx family?

Yes, the PCF85116-3T/01 is explicitly stated to be pin and address compatible with the PCx85xxC-2 family. Pins 1–3 are n.c., matching the footprint of earlier variants, and the WP pin occupies the same location (pin 7) as in compatible predecessors. However, unlike earlier versions, the PCF85116-3T/01 covers the full 16 kbit address space without requiring external address inputs - simplifying design migration.

What is the endurance rating of the PCF85116-3T/01 under typical operating conditions?

The PCF85116-3T/01 guarantees 1,000,000 erase/write cycles at Tamb = 22 °C, as specified in Table 9 of the datasheet. At extended temperature ranges (−40 °C to +85 °C), the rated endurance is 100,000 cycles. This endurance applies per memory byte and is validated under standard I²C write conditions with proper WP pin control and VDD within 2.7–5.5 V.

Does the PCF85116-3T/01 require an external high-voltage supply for programming?

No, the PCF85116-3T/01 integrates an on-chip voltage multiplier that generates the required programming voltage from the standard VDD supply (2.7–5.5 V). This eliminates the need for external high-voltage circuitry, simplifies PCB design, and enables single-supply operation - a key feature highlighted in Section 1 of the datasheet and confirmed in the Quick Reference Data table.