Renesas RM25C32C-BTAC-B

Overview

RM25C32C-BTAC-B from Adesto Technologies is a 32Kbit CBRAM®-based non-volatile serial memory IC, EEPROM-compatible and SPI interface-equipped, operating at 2.7V–3.6V supply with 5MHz fast read capability and 32-byte page write in ≤1ms. It serves as drop-in replacement for legacy SPI EEPROMs in embedded microcontroller firmware storage and sensor calibration data retention.

For engineers reviewing the RM25C32C-BTAC-B datasheet, RM25C32C-BTAC-B pinout, RM25C32C-BTAC-B application, or RM25C32C-BTAC-B equivalent, key selection criteria include its 25,000 write cycles, 10-year data retention, low-power 5µA power-down current, and support for SPI modes 0 and 3 in an 8-lead TSSOP package.

Technical Context

The RM25C32C-BTAC-B implements a 4-wire SPI interface (CS, SCK, SDI, SDO) with HOLD and WP pins, supporting both normal (1.6MHz) and fast (5MHz) read modes. Its internal architecture includes a 32-byte page buffer, status register with WIP/WEL bits, and direct-write CBRAM® memory array eliminating pre-erase requirements.

It uses self-timed erase/write cycles-page erase (32 bytes) and chip erase are supported, with byte write completing in ≤25µs and page write in ≤1ms. Power management includes power-down mode (5µA) and resume-from-power-down with 75µs wake-up delay.

Key Specifications

Pinout & Package

RM25C32C-BTAC-B is housed in an 8-lead Thin Shrink Small Outline Package (TSSOP), 3mm × 4.4mm body, JEDEC MO-153 compliant, with gull-wing leads and RoHS/halogen-free construction.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar non-volatile serial memory applications.

Compared with AT25DF041A-SSH-T and M95M02-DRMN6TP/K, RM25C32C-BTAC-B uniquely balances 5MHz read speed, 25k-cycle endurance, and 5µA power-down in a compact TSSOP - making it optimal for mixed-use cases requiring both rapid access and frequent small writes.

Availability

RM25C32C-BTAC-B is available at Aetrix Electronics and suitable for industrial sensor calibration storage, medical device configuration memory, and smart meter firmware patch storage requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant packaging.

Supply support for RM25C32C-BTAC-B 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

Adesto Technologies (now part of Dialog Semiconductor, acquired 2020) specialized in low-power, high-endurance non-volatile memory solutions based on proprietary CBRAM® technology.

The RM25C32C-BTAC-B belongs to Adesto's Mavriq™ family of serial memories, designed specifically to replace legacy EEPROMs in space-, power-, and performance-constrained embedded systems.

FAQ

What is the maximum SPI clock frequency supported by RM25C32C-BTAC-B in fast read mode?

The RM25C32C-BTAC-B supports up to 5MHz SCK frequency in fast read mode, enabling high-speed data retrieval for time-critical applications like boot firmware loading. This is confirmed in Section 3.2 AC Operating Characteristics of the DS-RM25C32C–063F–1/2018 datasheet, where fSCKF is specified as 0–5MHz. Normal read mode operates up to 1.6MHz.

Does RM25C32C-BTAC-B require a pre-erase step before writing new data?

No, RM25C32C-BTAC-B does not require pre-erase. As a CBRAM®-based device, it supports direct-write operation: data can be written to any location without prior erasure. Page or chip erase is optional and used only to reset blocks to '1' state - unlike flash or EEPROM, write operations proceed immediately after WREN activation.

What package type is used for RM25C32C-BTAC-B, and what are its key mechanical dimensions?

RM25C32C-BTAC-B uses an 8-lead TSSOP (Thin Shrink Small Outline Package), designated TA in Adesto's ordering nomenclature. Per JEDEC MO-153 AA, it measures 3.00mm (min) × 4.40mm (min) body size, with 0.65mm pitch, 0.45–0.75mm lead length, and 0.09–0.20mm thickness - optimized for high-density PCB layouts.

How many write cycles can RM25C32C-BTAC-B endure, and how is this verified?

RM25C32C-BTAC-B is rated for 25,000 write cycles, validated per JEDEC JESD22-A117B endurance testing methodology. This value applies to both byte and page writes and is guaranteed over the commercial temperature range (0°C to +70°C). The datasheet explicitly states "Endurance: 25000 Write Cycles" in Section 3.2.

Is RM25C32C-BTAC-B pin-compatible with standard SPI EEPROMs such as the AT25xxx series?

RM25C32C-BTAC-B is functionally and pinout-compatible with industry-standard 8-lead SPI EEPROMs (e.g., AT25xxx, CAT25xxx) using the same 4-wire interface (CS, SCK, SI, SO) plus WP and HOLD. Its pin mapping matches JEDEC SOIC/TSSOP footprints - enabling drop-in replacement in existing designs without PCB revision, provided timing and voltage margins are verified.