Toshiba Semiconductor and Storage TC78H620FNG

Overview

TC78H620FNG from Toshiba Electronic Devices & Storage Corporation is a dual-H-bridge motor driver IC designed for bidirectional control of two DC brushed motors or one bipolar stepping motor. It integrates DMOS power transistors, supports VM = 2.5–15 V and VCC = 2.7–5.5 V, delivers 1.0 A max output current per channel, and features built-in UVLO, TSD, ISD, cross-conduction protection, and internal 200 kΩ input pull-downs. It is used in compact motion-control systems such as portable robotics and precision actuators.

For engineers reviewing the TC78H620FNG datasheet, TC78H620FNG pinout, TC78H620FNG application, or TC78H620FNG equivalent, key selection considerations include its SSOP16 package, dual-channel independent enable/phase control, 1.2 Ω typical R_ON(U+L), thermal shutdown at 170°C (typ.), and under-voltage lockout thresholds at 2.2 V (VCC) and 2.0 V (VM).

Technical Context

The TC78H620FNG implements two independent full-bridge drivers with integrated predrivers and DMOS output stages. Each bridge supports PWM-controlled forward/reverse operation via separate EN_x and PHA_x inputs, with logic-level compatibility (V_IN(H) = 2.0 V min, V_IN(L) = 0.8 V max) and 500 kHz max switching frequency.

Protection architecture includes latch-type overcurrent detection (1.7 A typ., 4 μs noise masking), thermal shutdown (170°C trip, 130°C release), and dual-rail UVLO (VCC and VM monitored independently). Output states default to high-impedance during fault or standby, matching stop-mode behavior (EN_A = EN_B = L).

Key Specifications

Pinout & Package

TC78H620FNG is housed in a 16-pin SSOP package (0.65 mm pitch, 5.0 × 6.4 mm footprint, 0.07 g typical weight), optimized for space-constrained motor-control applications. The package features three GND pins (pins 11, 14, 16) for low-impedance return paths and two NC pins (1, 2) that must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with TB6612FNG and DRV8833, the TC78H620FNG uniquely combines dual-rail UVLO, latch-type ISD, and SSOP16 manufacturability - making it optimal for industrial and medical designs requiring robust, self-contained fault management without layout redesign.

Availability

TC78H620FNG is available at Aetrix Electronics and suitable for compact robotics actuators, portable medical pumps, smart home window blinds, and industrial lab automation stages requiring stable component supply, long-term lifecycle support, and RoHS-compliant sourcing.

Supply support for TC78H620FNG 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 control, and analog ICs for industrial, automotive, and consumer applications.

The TC78H620FNG belongs to Toshiba's CDMOS dual-bridge driver product line, engineered for reliable, space-efficient motor control in battery-powered and thermally constrained embedded systems.

FAQ

What is the maximum motor supply voltage supported by the TC78H620FNG?

The TC78H620FNG supports a motor supply voltage (VM) up to 15.0 V under operating conditions, with an absolute maximum rating of 18 V. Exceeding 15.0 V during normal operation risks violating the recommended operating range and may trigger UVLO or reduce reliability. The TC78H620FNG is commonly used with 5 V, 9 V, or 12 V motor rails in portable and industrial motion systems.

Does the TC78H620FNG support microstepping for stepper motors?

The TC78H620FNG does not implement microstepping internally; it supports full-step and half-step excitation modes only, as defined in its Input/Output Functions table. Microstepping requires external current control (e.g., via external DACs or chopper drivers), but the TC78H620FNG can serve as the power stage for such architectures by accepting step/direction signals translated into its EN/PHA format. The TC78H620FNG remains fully compatible with standard stepper sequencing firmware.

How does the TC78H620FNG handle overcurrent events?

The TC78H620FNG incorporates a latch-type overcurrent detection (ISD) circuit that triggers at ~1.7 A (typ.) per DMOS transistor and holds outputs in high-impedance state until manually reset. Reset methods include power cycling, toggling /STBY from L to H, or setting EN_A/EN_B to L then back to H. The TC78H620FNG includes 4 μs noise masking to prevent false triggering during PWM transitions.

Can the TC78H620FNG operate with a 3.3 V logic supply?

Yes, the TC78H620FNG operates with VCC from 2.7 V to 5.5 V, making 3.3 V fully compliant. Its input thresholds (V_IN(H) ≥ 2.0 V, V_IN(L) ≤ 0.8 V) ensure reliable recognition of standard 3.3 V CMOS logic levels. The TC78H620FNG draws only 0.5–1 mA in active mode at 3.3 V, supporting low-power MCU interfaces without level-shifting.

What thermal management considerations apply to the TC78H620FNG?

The TC78H620FNG features thermal shutdown at 170°C (typ.) and requires adequate PCB copper area (≥40% on 50 mm × 30 mm × 1.6 mm board) for heatsinking. Its SSOP16 package has no exposed thermal pad, so thermal performance depends on trace width, GND plane size, and airflow. At 1 A continuous load, junction temperature rise exceeds 100°C without proper layout - the TC78H620FNG must be used with careful thermal design to avoid repeated TSD activation.