Toshiba Semiconductor and Storage TC35681FSG-002(ELC

Overview

TC35681FSG-002 from Toshiba Electronic Devices & Storage Corporation is a Bluetooth® 5.0-compliant single-mode low energy SoC with ARM Cortex-M0 core, supporting all LE PHY rates (125 kbps–2 Mbps), +8 dBm TX output power, -105 dBm RX sensitivity at 125 kbps, and operation up to +125 °C - designed for long-range, low-power industrial IoT edge nodes.

For engineers reviewing the TC35681FSG-002 datasheet, TC35681FSG-002 pinout, TC35681FSG-002 application, or TC35681FSG-002 equivalent, key selection criteria include its extended temperature rating (+125 °C), absence of embedded Flash (vs. TC35680FSG), QFN40 5.0×5.0 mm package, dual UART/SPI/I²C interfaces, and standalone operation capability without external host controller.

Technical Context

The TC35681FSG-002 integrates a Bluetooth 5.0 LE modem with Coded PHY (S=8) and 2M PHY support, paired with an ARM Cortex-M0 CPU core running at up to 48 MHz. It includes 5-channel 12-bit ADCs, four PWM timers, and dual DC/DC regulators for efficient power management in battery-constrained environments.

Unlike TC35680FSG, TC35681FSG-002 omits on-chip Flash ROM (256 KB) and instead relies on external memory for firmware storage - confirmed by block diagram separation and "TBD" marking for Flash in TC35681 section. Its RF front-end features a high-efficiency PA enabling +8 dBm output while maintaining peak TX current of 11.0 mA at 3.0 V and 1 Mbps.

Key Specifications

Pinout & Package

TC35681FSG-002 uses a 40-pin QFN package (5.0 × 5.0 mm, 0.4 mm pitch) with exposed thermal pad (EPAD) connected to ground for thermal management. Pin functions are defined per Toshiba preliminary datasheet PE518010010A Rev. 2018-01.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Bluetooth 5.0 low energy SoC applications.

Compared with nRF52840 DK and CC2642R, TC35681FSG-002 uniquely combines +125 °C operation, standalone BLE stack execution, and Coded PHY-optimized RF performance - making it the only option qualified for continuous-duty industrial motor control and automotive under-hood telemetry without external thermal mitigation.

Availability

TC35681FSG-002 is available at Aetrix Electronics and suitable for industrial motor monitoring, smart building beacon networks, medical wearable sensor hubs, and automotive diagnostic tags requiring stable component supply across extended temperature ranges and long product lifecycles.

Supply support for TC35681FSG-002 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

Toshiba Electronic Devices & Storage Corporation designs and manufactures power semiconductors, logic ICs, and wireless connectivity solutions with emphasis on reliability, efficiency, and industrial-grade robustness.

The TC35681FSG-002 belongs to Toshiba's Bluetooth 5.0 SoC family engineered specifically for battery-operated, thermally demanding edge nodes where secure, long-range, low-power wireless telemetry is critical - not general-purpose computing or host-attached peripherals.

FAQ

Does TC35681FSG-002 include on-chip Flash memory?

No. TC35681FSG-002 does not integrate Flash ROM - unlike TC35680FSG which includes 256 KB Flash. Firmware must be loaded from external memory via UART, SPI, or I²C. This architecture reduces die cost and enables field updates without Flash wear concerns, but requires external non-volatile storage in the final design. TC35681FSG-002 retains 128 KB SRAM for runtime code and data.

What is the maximum operating temperature of TC35681FSG-002?

The TC35681FSG-002 is rated for continuous operation from -40 °C to +125 °C. This extended temperature range is verified per Toshiba's preliminary specification PE518010010A and distinguishes it from most competing BLE SoCs limited to +85 °C or +105 °C. It supports deployment in engine compartments, industrial inverters, and high-ambient factory automation systems without thermal throttling.

Can TC35681FSG-002 operate as a standalone BLE device without a host MCU?

Yes. TC35681FSG-002 supports standalone operation - its ARM Cortex-M0 core executes the full BLE protocol stack and application firmware independently. No external host processor is required. This eliminates inter-processor communication latency and reduces BOM count, making TC35681FSG-002 ideal for compact, cost-sensitive sensor nodes where size and power are constrained.

What RF performance metrics define TC35681FSG-002's long-range capability?

TC35681FSG-002 achieves long-range operation via two key RF metrics: +8 dBm maximum TX output power and -105 dBm receiver sensitivity at 125 kbps Coded PHY (S=8). These values enable >200 m line-of-sight range in open environments and reliable indoor penetration through walls and machinery enclosures - critical for industrial asset tracking and predictive maintenance deployments.

Which communication interfaces are available on TC35681FSG-002?

TC35681FSG-002 provides UART ×2, SPI ×2, I²C ×2, and up to 24 GPIOs. All interfaces operate concurrently and support standard voltage levels (1.8–3.6 V). The dual UARTs allow simultaneous debug logging and host command channel; dual SPIs support independent sensor and display interfaces; dual I²C buses enable connection to multiple sensors without address conflicts - all without software multiplexing.