Toshiba Semiconductor and Storage TB67H400AHG

Overview

TB67H400AHG from Toshiba Electronic Devices & Storage Corporation is a monolithic PWM chopper-type brushed DC motor driver IC fabricated using BiCD process technology. It delivers dual-channel H-bridge operation (4.0 A per channel in Small mode) or single-channel high-current drive (8.0 A in Large mode), with integrated current sensing, thermal shutdown, over-current detection, and programmable chopping frequency - deployed in industrial automation actuators requiring precise bidirectional motor control.

For engineers reviewing the TB67H400AHG datasheet, TB67H400AHG pinout, TB67H400AHG application, or TB67H400AHG equivalent, key selection criteria include its 50 V absolute max VM rating, 0.49 Ω typical on-resistance (HS+LS), mixed-decay constant-current control with fixed 37.5% decay timing, HBMODE-selectable dual vs. parallel H-bridge configuration, and external OSCM-based fchop tuning between 40–150 kHz.

Technical Context

The TB67H400AHG implements a dual H-bridge architecture with independent IN/OUT logic for two brushed DC motors in Small mode, or parallelized output stages (OUTA± + OUTB± tied) in Large mode for single-motor 8.0 A drive. Its internal oscillator (OSCM pin) sets chopper frequency (fchop = fOSCM / 16), enabling adjustable current ripple via external ROSC/COSC components.

Current regulation uses analog current-sense amplifiers (RSA/RSB) referenced to VREF, with fixed 37.5% Mixed Decay Timing and digital blanking (tBLKAB-selectable 3.6 µs or 5.4 µs) to suppress false over-current triggers during motor commutation transients. Protection includes thermal shutdown (Tj ≥ 145°C), over-current detection (ISD threshold 4.1–5.7 A), and power-on reset (VMR = 7.0–9.0 V).

Key Specifications

Pinout & Package

HZIP25-P-1.00F: 25-pin heat-sinked plastic SIP package with exposed thermal pad; 1.00 mm pitch; 7.6 g typical weight; designed for forced-air or heatsink-mounted industrial motor control PCBs.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar brushed DC motor driver applications.

Compared with DRV8876PWPR and MP6532GQZ, the TB67H400AHG uniquely supports both independent dual-motor control and parallelized 8.0 A single-motor drive in one package, while offering field-tunable chopping frequency, fixed 37.5% mixed-decay timing, and dual-level blanking - making it optimal for industrial motion systems requiring configurability, thermal robustness, and deterministic current regulation.

Availability

TB67H400AHG is available at Aetrix Electronics and suitable for industrial actuators, automated guided vehicles, medical infusion pumps, and smart HVAC dampers requiring stable component supply, long-term lifecycle support, and traceable sourcing for production programs.

Supply support for TB67H400AHG 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 high-reliability power semiconductors and motor drivers for industrial, automotive, and medical applications, with emphasis on integrated protection and thermal resilience.

The TB67H400AHG belongs to Toshiba's BiCD-based motor driver product line, engineered specifically for ruggedized brushed DC motor control in environments demanding high voltage tolerance (50 V), configurable multi-channel operation, and autonomous fault recovery.

FAQ

What is the maximum continuous motor current the TB67H400AHG can deliver in Large mode?

The TB67H400AHG supports up to 8.0 A continuous output current in Large mode (HBMODE = H), where both H-bridges operate in parallel. However, sustained operation above 5.6 A (70% of absolute max) requires aggressive thermal management - including a minimum 1.2°C/W heatsink and forced airflow - to prevent thermal shutdown activation at junction temperatures exceeding 145°C.

How does the TB67H400AHG implement constant-current control without an external current-sense amplifier?

The TB67H400AHG integrates dedicated current-sense amplifiers (RSA and RSB) that interface directly with low-side sense resistors. Combined with the VREF pin and internal 1/5.0 gain stage, it calculates peak motor current as IOUT = VREF × (1/5.0) / RRS. This closed-loop regulation operates autonomously within the IC, eliminating the need for external op-amps or DACs in constant-current applications.

Can the TB67H400AHG safely drive a 48 V motor given its 50 V absolute maximum VM rating?

No - the TB67H400AHG must not be operated with VM exceeding 47 V under normal conditions, despite its 50 V absolute maximum rating. The 47 V upper limit in the Operating Ranges table accounts for back-EMF transients and supply ripple. Applying 48 V risks permanent damage, as the device lacks overvoltage protection and will fail catastrophically if VM exceeds 50 V even momentarily.

What happens when the TB67H400AHG triggers thermal shutdown (TSD)?

When junction temperature reaches 145–175°C, the TB67H400AHG activates thermal shutdown: all H-bridge outputs disable, entering Hi-Z standby mode. Recovery requires either cycling the VM supply or asserting standby mode (setting INA1, INA2, INB1, INB2, PWMA, and PWMB all low). The TSD circuit is a last-resort protection - prolonged operation near TSD threshold degrades reliability and must be avoided via proper heatsinking.

Is the TB67H400AHG pin-compatible with earlier Toshiba motor drivers like the TB6612FNG?

No - the TB67H400AHG is not pin-compatible with the TB6612FNG or other Toshiba motor drivers. It uses a 25-pin HZIP25 package with unique pin assignments (e.g., separate RSA/RSB, OSCM, TBLKAB, HBMODE), distinct from the 24-pin SSOP package and functional pinout of TB6612FNG. Migration requires full PCB redesign and firmware adaptation for new control signals and protection features.