My Inquiry
My Account
Toshiba Semiconductor and Storage TC78S122FTG,EL
- Part No.:
- TC78S122FTG,EL
- Manufacturer:
- Toshiba Semiconductor and Storage
- Category:
- Motor Drivers, Controllers
- Package:
- 48-VFQFN Exposed Pad
- Datasheet:
-
TC78S122FTG,EL.pdf
- Description:
- IC MTR DRVR BIPLR 4.5-5.5V 48QFN
- Quantity:
- Payment:
- Shipping:
Inventory:1,892
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
TC78S122FTG from Toshiba is a PWM chopper-type dual-stepping motor driver IC with monolithic CD-process silicon construction. It integrates two H-bridge pairs to drive either two bipolar stepping motors (S-mode), one large stepping motor (L-mode), or up to four brushed DC motors - delivering 1.5 A max per phase in stepping mode and 2.0 A in DC mode, with 40 V max output withstand voltage and 0.6 Ω typical ON-resistance in small mode. It is used in precision motion control for industrial automation and robotics.
For engineers reviewing the TC78S122FTG datasheet, TC78S122FTG pinout, TC78S122FTG application, or TC78S122FTG equivalent, key selection considerations include its configurable motor drive modes (6 distinct combinations), mixed-decay current control with user-selectable tBLANK timing, integrated VCC regulator eliminating external 5 V supply, and built-in ISD/TSD/VMR protection circuits.
Technical Context
The TC78S122FTG implements a dual-channel PWM chopper architecture with independent current feedback loops per H-bridge pair (A/B and C/D), supporting both analog and digital blanking for overcurrent detection. Its mixed-decay control dynamically switches between charge, slow-decay, and fast-decay phases based on real-time current sensing against VREF-set thresholds.
Motor drive mode is selected via three hardware pins (MODE0–MODE2), configuring internal H-bridge interconnection and logic mapping - e.g., Stepping Motor (S) × 2 uses separate CLK/ENABLE/CW-CCW per channel, while Large Mode combines A+B and C+D bridges to halve effective Ron to 0.3 Ω and double current capability. All modes disable dynamic reconfiguration after power-on.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Output Withstand Voltage | 40 V - supports 24 V nominal industrial motor rails with margin for back-EMF spikes |
| Output Current (Stepping Mode) | 1.5 A max per phase - enables driving NEMA 17–23 stepper motors at full-step or microstep resolution |
| ON-Resistance (Small Mode) | 0.6 Ω (H+L) - limits conduction loss to ≤900 mW per bridge at 1.5 A, easing thermal design |
| ON-Resistance (Large Mode) | 0.3 Ω (combined H+L) - doubles current capacity to 3.0 A per combined channel with reduced I²R heating |
| Chopping Frequency Range | 40–150 kHz - adjustable via external RC on OSCM pin; ≥100 kHz enables low-audible-noise operation |
| VCC Regulator Output | 5.0 V ±0.5 V - powers internal logic without external LDO, simplifying BOM and layout |
| Thermal Shutdown Threshold | 150 °C (typ.) - protects die during overload or poor heatsinking; auto-recovery on VM reset |
Pinout & Package
Package: QFN48-P-0707-0.50 (7 mm × 7 mm, 0.5 mm pitch, exposed thermal pad).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUT_A+, OUT_A− OUT_B+, OUT_B− OUT_C+, OUT_C− OUT_D+, OUT_D− | H-bridge output terminals | Drive motor windings directly; each pair (A/B or C/D) supports independent stepping or DC control |
| VREF_A–VREF_D | Current reference inputs | Set per-channel peak current via external voltage (0–4 V); gain of 1/5.0 defines actual sense threshold |
| RS_A–RS_D | Current sense resistor connections | Low-side sensing nodes for closed-loop current regulation; require Kelvin routing for accuracy |
| CLK_AB / CLK_CD | Stepper clock inputs | Rising-edge-triggered step advance for AB or CD motor; fixed 300 ns tBLANK in stepping mode |
| ENABLE_AB / ENABLE_CD | Output enable controls | High = active drive; low = high-impedance Z-state - used for motor hold/release or power gating |
| CW_CCW_AB / CW_CCW_CD | Direction control inputs | Set rotation direction per motor; logic level determines phase sequence (full/half/quarter step) |
| D_TBLANK_AB / D_TBLANK_CD | Digital blanking select | In DC mode only: L = analog blanking (~550 ns); H = 4×OSC cycle blanking (~2.5 μs) for precise PWM sync |
| MODE0–MODE2 | Drive mode configuration | Hardwired logic selects among 6 motor configurations; must be stable before VM power-up |
| SLEEP | Power-down control | Low = disables VCC regulator and halts all logic; wake-up time ≤1 ms after high assertion |
| ALERT | Open-drain fault indicator | Pulled low on ISD or TSD activation; requires external 10 kΩ pull-up to VCC for proper signaling |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VCC regulator | Eliminates need for external 5 V supply - reduces component count and PCB area |
| Configurable motor drive modes | Six hardwired configurations (e.g., 2× stepper, 4× DC, combo) enable flexible system-level reuse |
| Mixed-decay current control | Automatically sequences charge/slow/fast decay phases to maintain precise current regulation across speed ranges |
| Over-current and thermal protection | ISD trips at 4.0 A (typ.), TSD at 150 °C (typ.) - latched faults require VM reset or SLEEP toggle |
| Programmable chopping frequency | 40–150 kHz via external RC on OSCM pin - supports noise-sensitive and high-efficiency designs |
Applications
| Industrial CNC Positioning | Medical Infusion Pump Actuation |
|---|---|
Use Scenario: Precise open-loop positioning of multi-axis gantries using NEMA 17 stepper motors with microstepping. IC Role / Device Role / Timing Role: Dual-channel stepper driver executing full/half/quarter-step sequences synchronized to external MCU clock signals. Use Value: Enables sub-micron repeatability via 0.6 Ω low-Ron bridges and 1.5 A phase current, minimizing torque ripple and heat generation. | Use Scenario: Controlled peristaltic motion in portable infusion pumps requiring silent, reliable fluid delivery. IC Role / Device Role / Timing Role: Single large-mode (L) stepper driver operating at 100 kHz chop frequency to suppress audible noise below 20 kHz. Use Value: Integrated VCC regulator and thermal shutdown ensure safe, maintenance-free operation in battery-powered medical enclosures. |
| Automated Test Equipment (ATE) | Robotic Joint Control |
Use Scenario: High-speed actuator sequencing in semiconductor handler systems with rapid direction reversal. IC Role / Device Role / Timing Role: Dual independent DC motor drivers (DC_S ×4 mode) controlled via PWM and MO/ENABLE logic. Use Value: 2.0 A DC current rating and digital tBLANK support enable clean commutation during 10 kHz PWM switching without false ISD triggers. | Use Scenario: Torque-controlled joint actuation in collaborative robots using hybrid stepper+DC configurations. IC Role / Device Role / Timing Role: Combo mode (Stepper S ×1 + DC L ×1) driving main axis stepper and auxiliary brake solenoid simultaneously. Use Value: Shared MODE pins and unified current feedback allow coordinated motion and safety braking with single IC footprint. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-H-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | Higher voltage rating (50 V), but discrete external MOSFETs required; no integrated VCC regulator | Used in high-voltage stepper systems (>36 V); lacks on-chip current regulation and mixed-decay control | Choose when >40 V rail or higher current (>3 A) is needed; accept added complexity and layout area |
| DRV8825 | Microstepping up to 32×, but fixed 2.2 A current limit and no large-mode bridge combination | Preferred for ultra-fine positioning where resolution > quarter-step is critical | Choose for high-resolution microstepping; avoid when thermal headroom or dual-motor concurrency is constrained |
Compared with TB6600HG and DRV8825, the TC78S122FTG uniquely integrates VCC regulation, selectable large/small mode bridging, and programmable chopping - enabling compact, self-contained dual-motor control with lower BOM cost and simplified thermal management.
Availability
TC78S122FTG is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pump actuation, automated test equipment (ATE), robotic joint control, and precision laboratory instrumentation requiring stable component supply and long-term production continuity.
Supply support for TC78S122FTG 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 semiconductor solutions for industrial, automotive, and consumer applications, with leadership in motor control ICs and power management.
The TC78S122FTG belongs to Toshiba's CD-process motor driver family, engineered specifically for compact, thermally efficient multi-motor control in space-constrained embedded systems - emphasizing integration, protection robustness, and flexible mode configuration.
FAQ
What motor drive modes does the TC78S122FTG support?
The TC78S122FTG supports six hardwired motor drive modes selected by MODE0–MODE2 pins: Stepping Motor (S) × 2, DC Motor (L) × 2, Stepping Motor (L) × 1, DC Motor (S) × 4, Stepping Motor (S) × 1 + DC Motor (L) × 1, and Stepping Motor (S) × 1 + DC Motor (S) × 2. Each mode reconfigures internal H-bridge interconnections and input logic mapping - for example, Large Mode combines A+B and C+D bridges to halve ON-resistance and double current capacity. Dynamic mode switching is not supported.
How does the TC78S122FTG implement current regulation and decay control?
The TC78S122FTG uses VREF-based current setting with low-side RS-pin sensing and mixed-decay control that automatically cycles through charge, slow-decay, and fast-decay phases. In stepping mode, decay timing is fixed at 37.5% or 12.5% mixed ratio depending on D_TBLANK state; in DC mode, digital blanking (4×OSC) or analog blanking (~550 ns) prevents false ISD triggering during PWM transitions. This ensures stable current regulation across speed and load variations without external compensation.
Does the TC78S122FTG require an external 5 V supply for logic operation?
No, the TC78S122FTG incorporates an internal VCC regulator that generates a stable 5.0 V ±0.5 V supply from the VM rail, eliminating the need for an external 5 V LDO or regulator. This integrated regulator powers all internal logic circuits and is enabled automatically when VM exceeds 6.8 V (VMR threshold). The VCC pin is an output - do not drive it externally - and supplies up to 5 mA for light external loads if needed.
What protection features are built into the TC78S122FTG?
The TC78S122FTG includes over-current detection (ISD), thermal shutdown (TSD), and VM power-on reset (POR) circuits. ISD triggers at 4.0 A (typ.) and latches until VM is cycled or SLEEP is toggled; TSD activates at 150 °C (typ.) to disable outputs and prevent permanent damage; POR ensures logic remains inactive until both VM and VCC reach valid levels. An open-drain ALERT pin signals both ISD and TSD events, requiring a 10 kΩ pull-up to VCC for proper fault reporting.
Can the TC78S122FTG drive both stepper and DC motors simultaneously?
Yes, the TC78S122FTG supports simultaneous operation in Combination Mode - specifically "Stepping Motor (S) × 1 + DC Motor (L) × 1" and "Stepping Motor (S) × 1 + DC Motor (S) × 2" - using MODE0–MODE2 pins to configure mixed H-bridge assignments. In these modes, AB channels drive one stepper motor while CD channels drive one or two DC motors, sharing common power (VM) and ground (GND) nets. Pin functions are remapped accordingly (e.g., CLK_AB remains active, while ENABLE_CD assumes DC PWM control), and current settings are independently configured via VREF_A–VREF_D.
TC78S122FTG,EL Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Toshiba Semiconductor and Storage
- Series:
- -
- Package/Case:
- 48-VFQFN 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-QFN (7x7)
TC78S122FTG,EL FAQ
1.How can I place an order for TC78S122FTG,EL through Aetrix?
Please submit a Request for Quotation (RFQ) for TC78S122FTG,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 TC78S122FTG,EL reliable?
The price and inventory of TC78S122FTG,EL are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TC78S122FTG,EL is usually 5 days.
3.What payment methods are accepted for TC78S122FTG,EL?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TC78S122FTG,EL transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TC78S122FTG,EL?
TC78S122FTG,EL orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TC78S122FTG,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 TC78S122FTG,EL?
For technical support, including TC78S122FTG,EL datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TC78S122FTG,EL requirements.
6.How does Aetrix verify that TC78S122FTG,EL is sourced from the original manufacturer or authorized distributors?
All TC78S122FTG,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 TC78S122FTG,EL meets industry standards.
7.What is the process for return or replacement of TC78S122FTG,EL?
All TC78S122FTG,EL units undergo pre-shipment inspection (PSI). If there is an issue with TC78S122FTG,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 TC78S122FTG,EL part is unused and in its original packaging.
Return procedure for TC78S122FTG,EL:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
TC78S122FTG,EL Tags
-
DRV2603RUNR
Texas Instruments
-
DRV8837CDSGR
Texas Instruments
-
DRV8837DSGR
Texas Instruments
-
DRV8838DSGR
Texas Instruments
-
DRV8839DSSR
Texas Instruments
-
EMC2301-1-ACZL-TR
Microchip Technology
-
DRV8231ADSGR
Texas Instruments
-
EMC2302-2-AIZL-TR
Microchip Technology
-
DRV8800PWPR
Texas Instruments
-
DRV8835DSSR
Texas Instruments
-
EMC2303-1-KP-TR
Microchip Technology
-
DRV8876PWPR
Texas Instruments
Tech Hub
Counterfeit components can hide behind convincing markings and passing basic function tests. This engineering reference covers source traceability, external inspection, X-ray, XRF, electrical testing, …
A practical engineering and sourcing framework covering lifecycle verification, lifetime-buy calculations, replacement qualification, supplier checks and counterfeit-risk controls.
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
