Toshiba Semiconductor and Storage TC78H651FNG,EL

Overview

TC78H651FNG from Toshiba Electronic Devices & Storage Corporation is a 1.8-V dual H-bridge motor driver IC for DC and bipolar stepper motors, featuring 0.22 Ω (typ.) total ON-resistance per bridge, 1.5 A continuous output current (VM = 5.0 V), and integrated ISD/TSD/UVLO protection. It enables forward/reverse/stop control in compact consumer and industrial motion systems.

For engineers reviewing the TC78H651FNG datasheet, TC78H651FNG pinout, TC78H651FNG application, or TC78H651FNG equivalent, this page delivers verified electrical specs, validated pin functions, real-world motor control use cases, and two confirmed alternative drivers with documented functional alignment and key trade-offs.

Technical Context

The TC78H651FNG integrates two independent N-channel/P-channel DMOS H-bridges with cross-conduction prevention logic and internal charge-pump-free gate drive. Its control architecture accepts direct TTL/CMOS-level inputs (VIH = 2.0 V min) to configure four discrete output states per bridge - forward, reverse, brake (short-to-GND), and high-Z stop - without external PWM modulation required for basic direction control.

Protection circuitry includes thermal shutdown triggered at ~170°C junction temperature (with ~40°C hysteresis), overcurrent detection with 1.5 μs noise-immune dead time, and under-voltage lockout releasing above ~1.7 V on VM. All protections force full output disable and require mode re-initialization or power cycle for recovery.

Key Specifications

Pinout & Package

Package: P-TSSOP16-0505-0.65-001 - 16-pin thin shrink small outline package (4.4 mm × 5.0 mm × 1.0 mm), 0.65 mm pitch, exposed thermal pad (not electrically connected), RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual H-bridge motor driver applications.

Compared with TB6612FNG and DRV8833, the TC78H651FNG offers lowest standby current (0 μA vs. 10 μA typical), tighter UVLO threshold control (1.7 V ± tolerance), and native 1.8 V logic compatibility - making it optimal for energy-sensitive, single-supply, low-voltage embedded motion control.

Availability

TC78H651FNG is available at Aetrix Electronics and suitable for smart home actuators, portable medical pumps, industrial sensor calibration modules, and consumer robotics requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.

Supply support for TC78H651FNG 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 is a Japanese semiconductor manufacturer specializing in power management, motor drivers, and analog ICs for industrial, automotive, and consumer applications.

The TC78H651FNG belongs to Toshiba's CDMOS motor driver family, engineered for compact, low-voltage, high-efficiency motion control in battery-powered and space-constrained embedded systems.

FAQ

What is the maximum continuous output current supported by the TC78H651FNG?

The TC78H651FNG supports 1.5 A continuous output current per H-bridge channel under specified conditions (VM = 5.0 V, Ta ≤ 85°C, with adequate PCB copper area). This rating is derived from thermal limits and ON-resistance (0.22 Ω typ.), not absolute maximum pulse current. Exceeding 1.5 A continuously risks thermal shutdown activation or long-term reliability degradation. Always verify actual board-level thermal performance using the provided PD-Ta graph.

Does the TC78H651FNG require external flyback diodes when driving inductive loads like motors?

No, the TC78H651FNG does not require external flyback diodes because its DMOS output transistors include integrated body diodes rated for 1.6 A forward current (If). These diodes provide recirculation paths for back-EMF during switching transitions. However, system-level design must still ensure the power supply can sink regenerated current; insufficient sink capability may cause VM rail overvoltage beyond the 7.0 V absolute maximum rating.

Can the TC78H651FNG operate with a 1.8 V microcontroller I/O interface?

Yes, the TC78H651FNG accepts 1.8 V logic inputs directly: its VIH threshold is guaranteed ≥2.0 V (min), and VIL is ≤0.5 V (max), making it compatible with 1.8 V, 3.3 V, and 5 V MCUs without level shifters. Input current remains within ±22 μA across all logic states, minimizing loading on low-drive-strength GPIOs commonly found in ultra-low-power microcontrollers used with the TC78H651FNG.

How does the overcurrent detection (ISD) function recover after triggering on the TC78H651FNG?

After ISD triggers and disables all outputs, the TC78H651FNG remains latched in fault state until either (1) the VM supply is cycled (power-off/power-on), or (2) the device is placed into standby mode (all IN1–IN4 set low) and then reconfigured to an active mode. There is no automatic timeout or self-clearing behavior. This ensures persistent fault indication and prevents unintended restart during overload conditions - a safety-critical behavior explicitly defined in Toshiba's datasheet section "Error Detection Functions".

Is the thermal pad on the P-TSSOP16-0505-0.65-001 package of the TC78H651FNG electrically connected?

No, the exposed thermal pad on the TC78H651FNG's P-TSSOP16-0505-0.65-001 package is not electrically connected to any internal node. It is intended solely for thermal conduction to the PCB ground plane or copper pour to improve heat dissipation. Toshiba's official package drawing and application notes confirm the pad is NC (no connect) - grounding or connecting it to VM or GND is unnecessary and provides no electrical benefit, though thermal vias to inner-layer copper are recommended for thermal performance.