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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Motor Drivers, Controllers

Toshiba Semiconductor and Storage TC78S122FNG,EL

Name: TC78S122FNG,EL
Brand: Toshiba Semiconductor and Storage
SKU: TC78S122FNG,EL
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: TC78S122FNG,EL

Manufacturer:: Toshiba Semiconductor and Storage

Category:: Motor Drivers, Controllers

Package:: 48-TFSOP (0.240", 6.10mm Width) Exposed Pad

Datasheet:: TC78S122FNG,EL.pdf

Description:: IC MOTOR DRIVER BIPOLAR 48HTSSOP

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Product details

Overview

TC78S122FNG from Toshiba is a PWM chopper-type dual-stepping motor driver IC with monolithic CD-process silicon construction, integrating two H-bridge pairs for driving up to two bipolar stepping motors or four brushed DC motors. It delivers 1.5 A max per phase in Stepping Motor (S) mode, supports 40 V max VM withstand voltage, and features integrated VCC regulation eliminating need for external 5 V supply.

For engineers reviewing the TC78S122FNG datasheet, TC78S122FNG pinout, TC78S122FNG application, or TC78S122FNG equivalent, key selection considerations include its configurable motor drive modes (Stepping S×2, DC L×2, Combination), mixed-decay current control with tBLANK programmability, thermal/over-current protection, and HTSSOP48 package with 0.5 mm pitch for high-density motor control PCBs.

Technical Context

The TC78S122FNG implements dual-channel independent stepping motor control using internal step decoders and 2-bit D/A torque/angle control logic. Each channel accepts CLK/CW-CCW/ENABLE inputs and supports full/half/quarter-step resolution via MODE1/MODE2 pins.

Its output stage uses low-R_ON DMOS H-bridges (0.6 Ω typical in Small Mode, 0.3 Ω in Large Mode), with current feedback via RS pins and chopping frequency set by external CR network (40–150 kHz). Protection includes ISD (2.1–5.0 A detection), TSD (140–170 °C trip), VMR/VCCR monitoring, and POR circuitry.

Key Specifications

Parameter	Value and Actual Design Meaning
Motor Supply Voltage	8–38 V DC - Enables direct connection to common industrial 12 V/24 V rails without level-shifting.
Max Output Current (Stepper)	1.5 A per phase - Sufficient for NEMA 11–17 stepper motors in open-loop positioning systems.
H-Bridge R_ON (Small Mode)	0.6 Ω (H+L) - Limits conduction loss to ≤900 mW at 1.5 A, reducing thermal load on HTSSOP48 package.
Chopping Frequency Range	40–150 kHz - High-frequency operation minimizes audible noise and improves current regulation fidelity.
Integrated VCC Regulator	5.0 V ±0.5 V @ 5 mA - Eliminates need for external 5 V LDO, simplifying power tree and reducing BOM count.
Thermal Shutdown Threshold	150 °C typical - Protects against sustained overload or poor heatsinking; recovery requires VM power cycle or SLEEP toggle.
Logic Input Compatibility	3.3 V / 5 V tolerant - Supports direct interface with microcontrollers, FPGAs, and PLC I/O without level shifters.

Pinout & Package

Package: HTSSOP48 (Heat Sink Thin Shrink Small Outline Package), 48-pin, 0.5 mm pitch, exposed thermal pad (pin 48 = GND). Designed for forced-air or PCB copper thermal management in motor drive applications.

Pin/Terminal	Circuit Role	Design Meaning
VM (Pins 1,2,23,24)	Motor Power Input	Four dedicated high-current VM inputs reduce IR drop and improve current sharing across H-bridges.
OUT_A+/A−, B+/B−, C+/C−, D+/D− (Pins 9–16,33–40)	H-Bridge Output Terminals	Eight dedicated motor output pins support independent 2-phase stepper or 4-channel DC motor control.
RS_A–D (Pins 10,15,34,39)	Current Sense Inputs	Four Kelvin-sense RS pins enable precise per-phase current feedback for closed-loop torque control.
CLK_AB/CD, ENABLE_AB/CD (Pins 5,6,7,8)	Stepper Control Inputs	Dual independent clock/enable interfaces allow asynchronous operation of two stepper motors.
SLEEP (Pin 3), ALERT (Pin 4)	Power & Fault Management	SLEEP disables VCC regulator for <20 μA standby; ALERT is open-drain fault indicator for ISD/TSD events.
VREF_A–D (Pins 42–45)	Current Reference Inputs	Four independent VREF pins permit channel-specific current limit tuning (GND to 4.0 V range).

Key Features

Feature	Design Value
Configurable Motor Drive Modes	6 distinct modes (e.g., Stepping S×2, DC L×2, Stepping S + DC S×2) selected via MODE0–2 pins - enables single-IC flexibility across multi-motor systems.
Mixed-Decay Current Control	Programmable decay timing (37.5% or 12.5% mixed decay) via D_TBLANK pins - optimizes torque ripple and efficiency across speed/load ranges.
On-Chip Oscillator & Chopper	Internal OSCM generator (1.2–2.0 MHz) with external CR tuning - eliminates need for external clock source while enabling precise chopping frequency control.
Comprehensive Protection Suite	Integrated ISD (2.1–5.0 A), TSD (140–170 °C), VMR/VCCR monitors, and POR - reduces external protection components and improves system reliability.
Large-Mode Parallel Operation	Pairing H-bridges (e.g., A+B or C+D) halves R_ON to 0.3 Ω and doubles current capacity - supports higher-power motors without external paralleling.

Applications

Industrial CNC Positioning	Medical Infusion Pumps
Use Scenario: Open-loop X-Y table control in compact desktop CNC mills using NEMA 14 stepper motors. IC Role / Device Role / Timing Role: Dual-channel stepper driver providing full/half-step excitation with 1.5 A phase current and 100 kHz chopping for smooth low-speed motion. Use Value: Integrated VCC regulation and thermal shutdown eliminate external regulators and discrete protection, reducing board area by >30% vs. discrete driver solutions.	Use Scenario: Precision peristaltic pump actuation in portable infusion devices requiring silent, accurate fluid delivery. IC Role / Device Role / Timing Role: Stepping Motor (S) × 2 mode driving dual micro-steppers with quarter-step resolution and mixed-decay current control. Use Value: 40 kHz minimum chopping frequency suppresses audible noise below human hearing range, critical for patient comfort in clinical environments.
Automotive HVAC Actuators	Robotics Joint Controllers
Use Scenario: Dual-blend door actuators in automotive climate control systems operating from 12 V battery supply. IC Role / Device Role / Timing Role: DC Motor (L) × 2 mode driving two 24 V brushed DC actuators with short-brake braking and 3.8 A peak current capability. Use Value: Built-in VMR detection ensures safe shutdown if battery voltage exceeds 7.3 V, preventing damage during load-dump transients.	Use Scenario: Multi-axis servo joint modules in collaborative robots using stepper motors for torque-controlled positioning. IC Role / Device Role / Timing Role: Stepping Motor (L) × 1 mode combining A+B and C+D bridges to deliver 2.1 A per phase with 0.3 Ω R_ON for high-torque low-RPM operation. Use Value: Large-mode parallel operation increases available torque by 40% over Small Mode while maintaining same PCB footprint and thermal design.

Industrial CNC Positioning

Medical Infusion Pumps

Use Scenario: Open-loop X-Y table control in compact desktop CNC mills using NEMA 14 stepper motors.

IC Role / Device Role / Timing Role: Dual-channel stepper driver providing full/half-step excitation with 1.5 A phase current and 100 kHz chopping for smooth low-speed motion.

Use Value: Integrated VCC regulation and thermal shutdown eliminate external regulators and discrete protection, reducing board area by >30% vs. discrete driver solutions.

Use Scenario: Precision peristaltic pump actuation in portable infusion devices requiring silent, accurate fluid delivery.

IC Role / Device Role / Timing Role: Stepping Motor (S) × 2 mode driving dual micro-steppers with quarter-step resolution and mixed-decay current control.

Use Value: 40 kHz minimum chopping frequency suppresses audible noise below human hearing range, critical for patient comfort in clinical environments.

Automotive HVAC Actuators

Robotics Joint Controllers

Use Scenario: Dual-blend door actuators in automotive climate control systems operating from 12 V battery supply.

IC Role / Device Role / Timing Role: DC Motor (L) × 2 mode driving two 24 V brushed DC actuators with short-brake braking and 3.8 A peak current capability.

Use Value: Built-in VMR detection ensures safe shutdown if battery voltage exceeds 7.3 V, preventing damage during load-dump transients.

Use Scenario: Multi-axis servo joint modules in collaborative robots using stepper motors for torque-controlled positioning.

IC Role / Device Role / Timing Role: Stepping Motor (L) × 1 mode combining A+B and C+D bridges to deliver 2.1 A per phase with 0.3 Ω R_ON for high-torque low-RPM operation.

Use Value: Large-mode parallel operation increases available torque by 40% over Small Mode while maintaining same PCB footprint and thermal design.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
TB6600HG	Higher voltage rating (50 V), but larger QFP64 package and no integrated VCC regulator - requires external 5 V supply.	Preferred for 48 V industrial systems; less suitable for space-constrained 24 V designs due to package size and extra regulator.	Choose TB6600HG when VM > 38 V or when higher absolute max ratings are required; avoid if board space or BOM count is critical.
DRV8825	Microstepping up to 32x, but lower max current (1.75 A), no Large Mode, and no integrated VCC - needs external regulator and current sense resistors.	Better for ultra-fine positioning (e.g., 3D printer Z-axis); lacks thermal robustness and combination modes needed for dual-motor industrial use.	Choose DRV8825 for high-resolution microstepping in low-power consumer devices; TC78S122FNG preferred for industrial dual-motor systems requiring ruggedness and integration.

Compared with TB6600HG and DRV8825, the TC78S122FNG uniquely combines dual independent stepper control, Large/Small mode flexibility, integrated 5 V regulation, and comprehensive protection in a compact HTSSOP48 package - delivering higher functional density and lower system-level component count for industrial motor control.

Availability

TC78S122FNG is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pumps, automotive HVAC actuators, and robotics joint controllers requiring stable component supply and long-term production continuity.

Supply support for TC78S122FNG 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 global semiconductor manufacturer specializing in power management, motor control, and analog ICs for industrial, automotive, and consumer applications.

The TC78S122FNG belongs to Toshiba's "Motor Driver IC" product line, designed specifically for high-efficiency, highly integrated control of stepper and brushed DC motors in space- and reliability-constrained embedded systems.

FAQ

What motor drive modes does the TC78S122FNG support?

The TC78S122FNG supports six motor drive modes: Stepping Motor (S) × 2, DC Motor (L) × 2, Stepping Motor (L) × 1, DC Motor (S) × 4, Stepping Motor (S) + DC Motor (L), and Stepping Motor (S) + DC Motor (S) × 2. These are selected via MODE0–MODE2 pins and cannot be changed dynamically during operation. Each mode reconfigures the internal H-bridge connections and control logic to match motor type and performance requirements, making the TC78S122FNG adaptable across diverse motion control applications without hardware redesign.

How does the TC78S122FNG implement current limiting and decay control?

The TC78S122FNG uses external RS sense resistors and internal comparators to monitor phase current, triggering PWM chopping when the VREF-set threshold is exceeded. Decay behavior is controlled via D_TBLANK pins: Low selects 37.5% mixed decay (fixed), while High selects 12.5% mixed decay with extended fast-decay timing. This allows fine-tuning of torque ripple and efficiency across speed ranges. The TC78S122FNG also supports analog tBLANK (≈300 ns) or digital tBLANK (4×OSC cycles) for noise immunity during current sensing - critical for reliable operation in electrically noisy motor environments.

What thermal management considerations apply to the TC78S122FNG?

The TC78S122FNG incorporates thermal shutdown (TSD) at 150 °C typical, but sustained operation near this limit risks premature failure. Its HTSSOP48 package requires a thermally robust PCB layout: the exposed pad (Pin 48 = GND) must be soldered to a large copper pour with ≥6 thermal vias, and VM/GND traces must be wide (>1 mm) to minimize IR drop and heating. Derating is required above 25 °C ambient (10.4 mW/°C), and maximum continuous current should be limited to ≤1.4 A per phase to maintain junction temperature ≤120 °C under typical board conditions - verified via thermal simulation or IR imaging during prototype validation.

Can the TC78S122FNG drive both stepper and DC motors simultaneously?

Yes, the TC78S122FNG supports simultaneous operation of stepper and DC motors in two combination modes: Stepping Motor (S) × 1 + DC Motor (L) × 1, and Stepping Motor (S) × 1 + DC Motor (S) × 2. In these modes, channels A/B drive one stepper motor while channels C/D drive one or two DC motors, respectively. Pin assignments are reconfigured automatically based on MODE0–MODE2 settings, and independent VREF, CLK, and ENABLE signals allow asynchronous control. However, impedance balancing between shared VM/GND paths is mandatory to prevent current imbalance - requiring matched trace lengths and symmetric layout per the datasheet guidelines.

What is the role of the SLEEP and ALERT pins on the TC78S122FNG?

The SLEEP pin (Pin 3) controls the TC78S122FNG's power state: logic low disables the internal VCC regulator, reducing quiescent current to <20 μA for battery-powered standby; logic high restores full operation within 1 ms. The ALERT pin (Pin 4) is an open-drain fault indicator that pulls low during ISD (over-current) or TSD (thermal shutdown) events. It requires an external pull-up resistor (e.g., 10 kΩ to VCC) and provides system-level fault signaling without needing additional monitoring circuitry - enabling immediate MCU intervention or visual alarm activation in safety-critical TC78S122FNG-based systems.

TC78S122FNG,EL Specifications

Product attributes: Attribute value

Manufacturer:: Toshiba Semiconductor and Storage

Series:: -

Package/Case:: 48-TFSOP (0.240", 6.10mm Width) Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Motor Type - Stepper:: Bipolar

Motor Type - AC, DC:: Brushed DC

Function:: Driver - Fully Integrated, Control and Power Stage

Output Configuration:: Half Bridge (8)

Interface:: Parallel

Technology:: Power MOSFET

Step Resolution:: 1, 1/2, 1/4

Applications:: General Purpose

Current - Output:: 2A

Voltage - Supply:: 4.5V ~ 5.5V

Voltage - Load:: 8V ~ 38V

Operating Temperature:: -20°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 48-HTSSOP

TC78S122FNG,EL FAQ

1.How can I place an order for TC78S122FNG,EL through Aetrix?

Please submit a Request for Quotation (RFQ) for TC78S122FNG,EL on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for TC78S122FNG,EL reliable?

The price and inventory of TC78S122FNG,EL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC78S122FNG,EL is usually 5 days.

3.What payment methods are accepted for TC78S122FNG,EL?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC78S122FNG,EL transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for TC78S122FNG,EL?

TC78S122FNG,EL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your TC78S122FNG,EL order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for TC78S122FNG,EL?

For technical support, including TC78S122FNG,EL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC78S122FNG,EL requirements.

6.How does Aetrix verify that TC78S122FNG,EL is sourced from the original manufacturer or authorized distributors?

All TC78S122FNG,EL products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that TC78S122FNG,EL meets industry standards.

7.What is the process for return or replacement of TC78S122FNG,EL?

All TC78S122FNG,EL units undergo pre-shipment inspection (PSI). If there is an issue with TC78S122FNG,EL, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The TC78S122FNG,EL part is unused and in its original packaging.

Return procedure for TC78S122FNG,EL:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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