Toshiba Semiconductor and Storage TB6561NG

Overview

TB6561NG from Toshiba is a dual full-bridge driver IC for DC brush motors, integrating Bi-CMOS silicon monolithic technology with two independent H-bridge output stages. It delivers up to 1.5 A peak output current per channel, features 1.5 Ω typical total ON-resistance (upper + lower MOSFETs), and supports direct PWM current control with internal 500 ns dead-time generation for shoot-through prevention. It is used in bidirectional motor control applications such as robotic actuators and automated door systems.

For engineers reviewing the TB6561NG datasheet, TB6561NG pinout, TB6561NG application, or TB6561NG equivalent, key selection considerations include its 10–36 V operating supply range, thermal shutdown at 160°C (typ.), overcurrent protection at 2.5 A (typ.), and SDIP-24 package compatibility with through-hole PCB assembly and high-current motor drive layouts.

Technical Context

The TB6561NG implements two independent full-bridge output stages using low-R_DS(on) N-channel MOSFETs, each controlled by dedicated logic inputs (IN1/IN2 per channel) and PWM direction pins (PWMA/PWMB). Its internal PWM current control system alternates between forward/reverse and short-brake modes without external timing components.

A shared thermal shutdown circuit (160°C activation, 40°C hysteresis) and per-channel overcurrent detection (2.5 A threshold, 10 μs glitch immunity) feed into a single CLD output pin. The IC also provides an internal 5 V regulator (Vreg) with ±2.5% tolerance at 1 mA load, decoupled via 0.1 μF capacitor to S-GND.

Key Specifications

Pinout & Package

Package: SDIP-24-P-300-1.78 - 24-pin single-in-line plastic package with 300 mil body width and 1.78 mm lead pitch, optimized for high-current through-hole mounting and thermal dissipation via P-GND pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with STSPIN840 and DRV8876N, the TB6561NG uniquely integrates dual independent full-bridges, short-brake functionality, and unified fault reporting in a single SDIP-24 package - simplifying PCB layout and reducing firmware overhead for brushed DC motor systems requiring coordinated bidirectional control.

Availability

TB6561NG is available at Aetrix Electronics and suitable for industrial actuators, automated door systems, robotic joint modules, and conveyor belt indexing requiring stable component supply across multi-year production cycles.

Supply support for TB6561NG 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 high-reliability semiconductor solutions for industrial, automotive, and consumer applications, with deep expertise in power management and motor control ICs.

The TB6561NG belongs to Toshiba's Bi-CMOS full-bridge driver product line, engineered specifically for cost-sensitive, medium-power brushed DC motor applications demanding robust protection, compact footprint, and simplified control interface.

FAQ

What is the maximum continuous output current rating for the TB6561NG?

The TB6561NG is rated for 1.5 A peak output current per channel under specified conditions (Ta = 25°C, with adequate heatsinking). Continuous current capability depends on ambient temperature, PCB copper area, and airflow; at 75°C ambient with 50 mm × 50 mm × 1.6 mm board (50% Cu), derating reduces usable current to approximately 0.8 A per channel to maintain junction temperature below 150°C. The TB6561NG datasheet specifies absolute maximum ratings and thermal resistance curves to guide real-world thermal design.

Does the TB6561NG support PWM speed control, and what is its maximum frequency?

Yes, the TB6561NG supports direct PWM speed control via its PWMA and PWMB pins, which accept 0–5 V logic-level signals. It operates reliably up to 100 kHz PWM frequency, enabling smooth motor velocity regulation and reduced acoustic noise. Internal dead-time generation (500 ns typ.) ensures safe switching transitions without external timing components. The TB6561NG PWM input circuitry includes hysteresis (0.4 V typ.) to reject noise and ensure clean edge detection.

How does the CLD pin function on the TB6561NG, and what fault conditions trigger it?

The CLD pin on the TB6561NG is an open-drain output that goes high during overcurrent detection (ILIM = 2.5 A typ.) in either channel or thermal shutdown (TSD = 160°C typ.). It remains high until the fault condition clears - current drops below threshold or junction temperature falls below 120°C (40°C hysteresis). The TB6561NG CLD circuit supports automatic recovery and requires an external pull-up resistor (typically 10 kΩ to 5 V) for proper logic-level signaling to host controllers.

What are the recommended decoupling capacitors for the TB6561NG power and logic supplies?

For the TB6561NG, place a 0.1 μF ceramic capacitor between Vreg (pin 2) and S-GND (pins 1/12/13/24) to stabilize the internal 5 V regulator. For motor supply filtering, use ≥100 μF low-ESR electrolytic capacitor between VCC (pins 7/18/23) and P-GNDA/P-GNDB (pins 10/15), located as close as possible to the IC. Additional 0.01 μF ceramic capacitors may be added in parallel for high-frequency noise suppression. These values are specified in the TB6561NG application circuit and thermal derating guidelines.

Can the TB6561NG drive two separate DC motors simultaneously, and how are their control signals isolated?

Yes, the TB6561NG integrates two fully independent full-bridge drivers (chA and chB), each with dedicated input pins (IN1A/IN2A/PWMA and IN1B/IN2B/PWMB), output terminals (OUT1A/OUT2A and OUT1B/OUT2B), and power grounds (P-GNDA/P-GNDB). Control signals are electrically isolated at the logic level - no shared control path exists between channels. The TB6561NG allows asynchronous operation: one motor can run forward while the other executes short-brake, enabling complex motion sequences in dual-motor systems.