Toshiba Semiconductor and Storage TB67S149HG

Overview

TB67S149HG from Toshiba Electronic Devices & Storage Corporation is a clock-controlled PWM chopping unipolar stepping motor driver IC in HZIP25 package, supporting 45 V VM supply, 84 V output voltage, 3.0 A peak output current per channel, and microstepping resolutions up to 1/32-step. It integrates BiCD-process MOSFETs with 0.25 Ω typical on-resistance and built-in error detection (TSD/ISD) for industrial motion control systems.

For engineers reviewing the TB67S149HG datasheet, TB67S149HG pinout, TB67S149HG application, or TB67S149HG equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative options, and OEM supply support - all grounded in Toshiba's official Rev. 2.5.A documentation.

Technical Context

The TB67S149HG implements a dual-channel N-ch MOSFET H-bridge architecture with integrated current-sense resistors (RSGNDA/RSGNDB), fixed off-time PWM control set via OSCM pin (820–8200 kHz), and programmable step resolution (full to 1/32-step) using DMODE0–DMODE2 logic inputs. Its internal VCC regulator supplies 5.0 V ±0.25 V to logic circuitry from VM input.

It features three open-drain status outputs - ERR (latched TSD/ISD fault), ALM (auto-recovering thermal alarm at 120 °C ±15 °C), and MO (electrical angle monitor) - each requiring external 3.3 V/5 V pull-up. Standby mode disables oscillator and output stage when DMODE0–DMODE2 = L/L/L, reducing quiescent current to ≤1.0 mA.

Key Specifications

Pinout & Package

HZIP25-P-1.00F: 25-pin molded plastic hybrid IC package with staggered dual-row layout, exposed thermal pad (connected to GND pins 15/24), and 1.00 mm pin pitch. Designed for through-hole mounting with high-power trace routing and thermal management via PCB copper pour under the package.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar unipolar stepping motor driver applications.

Compared with TB6600HG and LV8731V, the TB67S149HG uniquely balances high-resolution microstepping (1/32), robust analog control (VREF/CLK/DMODE), and integrated diagnostics (ALM/ERR/MO) in a thermally optimized HZIP25 package - making it optimal for industrial motion systems demanding both precision and reliability.

Availability

TB67S149HG is available at Aetrix Electronics and suitable for industrial CNC indexers, medical infusion pumps, automated laboratory analyzers, and 3D printer extruder positioning requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for TB67S149HG 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 devices, motor drivers, and logic ICs, with decades of expertise in BiCD process technology for high-voltage, high-current integration.

The TB67S149HG belongs to Toshiba's TB67S series of clock-controlled unipolar stepper drivers, designed specifically for industrial automation equipment requiring precise, low-noise, and thermally resilient motor control without microcontroller overhead.

FAQ

What is the maximum motor supply voltage supported by the TB67S149HG?

The TB67S149HG supports a motor supply voltage (VM) of 10–40 V under normal operation, with an absolute maximum rating of 45 V. This allows safe operation with standard 24 V industrial rails while accommodating back-EMF transients up to 84 V at the output pins - critical for preventing damage during rapid motor deceleration.

How does the TB67S149HG achieve microstepping without external controllers?

The TB67S149HG implements fully autonomous microstepping using its internal oscillator and logic decoder. Step resolution (full to 1/32-step) is selected via DMODE0–DMODE2 pins, while direction (CW/CCW) and stepping (CLK) are driven externally - eliminating need for MCU-based waveform generation or external sequencers.

Can the TB67S149HG drive bipolar stepper motors?

No, the TB67S149HG is specifically designed for unipolar stepper motors with center-tapped windings. Its output structure (OUTA+/OUTA−/OUTB+/OUTB−) and internal current-sense topology assume unipolar coil configuration; attempting to drive bipolar motors will result in incorrect commutation and potential device damage.

What is the purpose of the RSGNDA and RSGNDB pins on the TB67S149HG?

RSGNDA and RSGNDB are dedicated current-sense ground references for channels A and B, respectively. They provide low-impedance return paths for the internal current-sense amplifiers - isolating sense current from main power GND to prevent noise coupling and ensure accurate ±6% current regulation across operating conditions.

How does the ALM pin on the TB67S149HG differ from the ERR pin?

The ALM pin signals thermal alarm (120 °C ±15 °C) with auto-recovery - it goes low when threshold is reached and returns high after cooling to ~90 °C. The ERR pin latches on critical faults (TSD or ISD) and remains low until VM is cycled or standby mode is toggled - requiring active system intervention to clear.

Is a heat sink required for continuous 3.0 A operation of the TB67S149HG?

Yes - at 3.0 A per channel with 0.25 Ω R_DS(on), power dissipation exceeds 2.25 W per channel. With HZIP25's 39 °C/W junction-to-ambient thermal resistance, ambient temperatures >40 °C will exceed the 150 °C max junction limit. A heatsink (e.g., R_θHS = 3.5 °C/W) or forced airflow is mandatory for sustained 3.0 A loads.