Renesas HN58X24256FPI#S0

Overview

HN58X24256FPI#S0 from Hitachi is a 256-kbit (32,768 × 8-bit) two-wire serial EEPROM with I²C-compatible interface, 1.8 V to 5.5 V single-supply operation, 400 kHz clock frequency, and 64-byte page write capability. It delivers low-power standby current (3 µA max), 10 ms write cycle time at ≥2.7 V, and operates across –40°C to +85°C for consumer electronics data storage.

For engineers reviewing the HN58X24256FPI#S0 datasheet, HN58X24256FPI#S0 pinout, HN58X24256FPI#S0 application, or HN58X24256FPI#S0 equivalent, key selection criteria include its SOP-8 package, I²C address configuration via A0–A2 pins, WP-enabled hardware write protection, and compatibility with battery-backed systems requiring 10-year data retention and 10⁵ endurance cycles.

Technical Context

The HN58X24256FPI#S0 implements a two-wire I²C serial bus interface with fixed device code "1010", supporting up to eight devices on one bus via hard-wired A0–A2 address pins. Its internal architecture includes an MNOS memory array with CMOS low-voltage circuitry, enabling reliable byte and page write operations.

It features automatic page write (64 bytes per cycle), acknowledge polling for write-cycle status detection, and noise suppression (50 ns) on SCL/SDA inputs. The device uses open-drain SDA with external pull-up and supports three read modes: current address, random, and sequential - all initiated by R/W = 1 in the device address word.

Key Specifications

Pinout & Package

HN58X24256FPI#S0 is housed in an 8-pin plastic SOP (FP-8DB) package measuring 6.02 mm × 4.89 mm × 1.73 mm, with gull-wing leads and 1.27 mm pitch.

Key Features

Applications

Equivalent & Alternatives

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

Compared with HN58X24256FPI#S0, AT24C256B-PU offers faster write throughput and broader voltage tolerance, while BR24G256FJ-WE2 adds interrupt-driven write completion - both require validation of hardware write protection scope and I²C address decoding logic against the original design.

Availability

HN58X24256FPI#S0 is available at Aetrix Electronics and suitable for consumer audio, digital imaging, set-top box, and gaming peripheral applications requiring stable component supply, long-term data integrity, and I²C bus compatibility.

Supply support for HN58X24256FPI#S0 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

Hitachi Ltd. (now part of Renesas Electronics Corporation) is a Japanese semiconductor pioneer known for high-reliability memory and logic devices serving consumer, industrial, and automotive markets.

The HN58X24xxx series was designed specifically for cost-sensitive, low-power consumer electronics requiring robust nonvolatile storage - emphasizing I²C simplicity, wide voltage operation, and page-write efficiency in compact SOP packages.

FAQ

What is the maximum I²C clock frequency supported by the HN58X24256FPI#S0?

The HN58X24256FPI#S0 supports a maximum I²C clock frequency of 400 kHz, compliant with standard-mode I²C specifications. This limit applies across its full 1.8 V to 5.5 V operating voltage range and –40°C to +85°C temperature range. Exceeding 400 kHz may cause timing violations in setup/hold windows (e.g., tSU.STA ≥ 600 ns, tHD.STA ≥ 600 ns), leading to communication failure or corrupted writes. The HN58X24256FPI#S0 does not support fast-mode (1 MHz) operation.

How does the write protect (WP) pin function on the HN58X24256FPI#S0?

When the WP pin is driven high (VIH ≥ 0.7 × VCC), the HN58X24256FPI#S0 hardware-protects the upper 1/8 of memory - 32 kbit (4,096 bytes) - from write or erase operations, while allowing full read access. When WP is low (VIL ≤ 0.3 × VCC), all 256 kbit are writable. WP has no latching function and must remain statically high or low during active I²C transactions; toggling WP mid-operation may cause undefined behavior. The HN58X24256FPI#S0 does not support software-controlled or block-level write protection.

What package type and dimensions does the HN58X24256FPI#S0 use?

The HN58X24256FPI#S0 uses an 8-pin plastic SOP package designated FP-8DB, with JEDEC MS-012AC compliance. Its body measures 6.02 mm × 4.89 mm × 1.73 mm (L × W × H), lead pitch is 1.27 mm, and typical weight is 0.08 g. The package features gull-wing leads and is RoHS-compliant. It is not pin-compatible with the 14-pin TSSOP variant (HN58X24256TI); layout redesign is required for substitution.

Can the HN58X24256FPI#S0 operate reliably at 1.8 V supply voltage?

Yes, the HN58X24256FPI#S0 is fully specified for 1.8 V operation: DC parameters (e.g., VIH = 1.26 V min, VOL = 0.2 V max at IOL = 0.2 mA), AC timing (tWC = 15 ms max), and functionality (page write, acknowledge polling) are guaranteed at 1.8 V. However, write current increases to 5 mA max and write cycle time extends to 15 ms - design must accommodate longer write latency and ensure sufficient 1.8 V rail stability during writes. The HN58X24256FPI#S0 does not support sub-1.8 V operation.

What is the memory organization and addressing scheme of the HN58X24256FPI#S0?

The HN58X24256FPI#S0 contains 32,768 bytes organized as 32,768 × 8-bit. Its I²C device address is 7-bit: fixed "1010" prefix + 3-bit hardware address (A2, A1, A0) + R/W bit. Memory addressing uses two 8-bit words: the first holds bits A14–A8 (MSB), the second holds A7–A0 (LSB), supporting full 15-bit addressing. The HN58X24256FPI#S0 does not implement memory segmentation or bank switching - all addresses are linear and contiguous within the 256 kbit space.