motor drivers

TC78H621

Full part number: TC78H621FNG

Every spec below is cited to the manufacturer datasheet. Compare the closest alternatives, then ask the assistant what it means for your design.

00 — Overview

What the TC78H621 does

The TC78H621FNG is a dual-bridge driver IC incorporating DMOS output transistors for controlling DC brushed motors or stepping motors. It operates with a motor supply up to 18 V and a control supply of 2.7 to 5.5 V, delivering 1.1 A per output with a typical combined on-resistance of 0.8 Ω. The device features built-in overcurrent detection, thermal shutdown, and under-voltage lockout circuits to protect the system. It includes cross-conduction protection and internal pull-down resistors on inputs. This component drives two independent H-bridges, allowing precise motor control in industrial applications requiring robust protection and compact packaging.

Next step
Start building with TC78H621 → Every number above is cited straight from the datasheet — ask what they mean for your design, and the assistant answers from the same source documents.
01 — Key specifications

Datasheet parameters

Datasheet parameters for TC78H621
ParameterMinTypMaxConditionsSource
output current — — 800 mA —; Pin Assignment (Top view) Toshiba datasheet, p. 5 — Pin Assignment (Top view)
supply voltage range 2.7 V 3.3 V 5.5 V —; controlled; Pin Assignment (Top view) Toshiba datasheet, p. 5 — Pin Assignment (Top view)
operating temperature -30 °C — 85 °C Toshiba datasheet, p. 5 — Pin Assignment (Top view)
rise time — 20 ns — t; AC Electrical characteristics (Reference) Toshiba datasheet, p. 9 — AC Electrical characteristics (Reference)
fall time — 20 ns — t; AC Electrical characteristics (Reference) Toshiba datasheet, p. 9 — AC Electrical characteristics (Reference)
driver count — 2 — Toshiba datasheet, p. 1
02 — Alternatives

Closest matches to TC78H621

AP1511B 8.0× lower rise time, 5.7× lower fall time, 1.6× lower output current
DRV8837 5.5× higher fall time, 5.5× higher rise time, 1.7× higher supply voltage range
TC4426A 1.9× higher output current, 1.4× lower supply voltage range, 1.3× higher operating temperature
BD63006MUV 1.9× higher output current, 1.3× lower supply voltage range, 1.2× lower operating temperature
AT8236 7.5× higher fall time, 7.5× higher rise time, 6.3× higher supply voltage range
DRV8803 10.3× higher supply voltage range, 8.8× higher fall time, 8.8× higher rise time
DRV8833 9.0× higher rise time, 8.0× higher fall time, 2.0× higher supply voltage range
L293D 12.5× higher fall time, 12.5× higher rise time, 6.1× higher supply voltage range
03 — FAQ

Frequently asked questions

What is the driver count for the TC78H621FNG?

The driver count is 2.

What is the fall time under AC Electrical characteristics?

The fall time is 20 ns.

What is the maximum operating temperature for the TC78H621FNG?

The maximum operating temperature is 85 °C.

What is the output current for the TC78H621FNG?

The output current is 800 mA.

What is the rise time (t) under AC Electrical characteristics?

The rise time is 20 ns.

What is the supply voltage range for the TC78H621FNG?

The supply voltage range is 3.3 V.

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