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STMicroelectronics E-TEA3718SFPTR
- Part No.:
- E-TEA3718SFPTR
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
E-TEA3718SFPTR.pdf
- Description:
- IC MTR DRV BIPLR 4.75-5.25V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,051
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Product details
Overview
E-TEA3718SFPTR from STMicroelectronics is a bipolar stepper motor driver IC designed to regulate constant current in one winding of a bipolar stepper motor using switch-mode chopper control. It supports full-step and half-step operation, delivers up to 1.5 A output current, operates from 10–50 V motor supply (VS), and features integrated H-bridge output stage with built-in protection diodes for industrial motion control systems.
For engineers reviewing the E-TEA3718SFPTR datasheet, E-TEA3718SFPTR pinout, E-TEA3718SFPTR application, or E-TEA3718SFPTR equivalent, key selection criteria include its pre-alarm thermal output (active low at ~170 °C), selectable current levels via IN0/IN1 logic inputs, analog current tuning via REFERENCE voltage, and SO20 tape-and-reel packaging for automated assembly.
Technical Context
The TEA3718SFPTR implements a monostable pulse generator triggered by comparator outputs to control off-time (toff = 0.69·RT·CT) during chopper regulation, enabling precise current decay management. Its three-level current selection (low/medium/max or off) is determined by TTL-compatible IN0/IN1 inputs and a user-defined reference voltage applied to the REFERENCE pin.
The output stage integrates four Darlington transistors and four protection diodes in an H-bridge configuration, with SENSE RESISTOR connection for current sensing and PHASE input controlling current direction through Schmidt-triggered logic with short-circuit prevention delay. The PRE-ALARM output provides early thermal warning before full shutdown.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | ±1.5 A maximum - supports NEMA 17–23 stepper motors with sufficient torque at mid-speed ranges |
| Motor supply range (VS) | 10–50 V - accommodates unstabilized DC supplies common in industrial actuators and CNC subsystems |
| Logic supply (VSS) | 4.75–5.25 V - compatible with standard 5 V microcontroller I/O without level shifting |
| Current control resolution | 3 discrete levels + off state - selected by IN0/IN1 logic combination per truth table |
| Pre-alarm threshold | ~170 °C junction temperature - enables predictive thermal derating before hard fault shutdown |
| Off-time programmability | toff = 0.69·RT·CT - allows tuning of chopper frequency and current ripple via external RC network |
| Thermal resistance (Rth(j-a)) | 60 °C/W (SO20 on 4 cm² copper) - defines maximum power dissipation limit under natural convection |
Pinout & Package
E-TEA3718SFPTR is housed in a 20-pin Small Outline (SO20) package with tape-and-reel delivery for SMT assembly. Thermal performance relies on GND pins (pins 10, 11, 19, 20) conducting heat to PCB copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA / OUTB | H-bridge output terminals | Drive opposite ends of single motor winding; form bidirectional current path with PHASE control |
| PHASE | Direction control input | TTL-compatible signal with Schmitt trigger; sets current flow direction (OUTA→OUTB or OUTB→OUTA) |
| IN0 / IN1 | Current level select inputs | Two-bit logic interface selecting one of three current thresholds or zero-current state |
| REFERENCE | Analog reference voltage input | Defines comparator thresholds; enables continuous current tuning when varied externally |
| SENSE RESISTOR | Current sense node | Connects to low-side shunt resistor (RS); feeds filtered voltage to internal comparators |
| PULSE TIME | Monostable timing input | Accepts RC network setting fixed off-time (toff) for chopper regulation cycle |
| PRE-ALARM | Open-drain thermal warning output | Active-low signal asserted at ~170 °C junction temp; used for system-level thermal management |
| VSS | Logic supply input | 5 V ±5% supply for internal logic and comparators; must be stable before VS ramp-up |
| VS(A)/VS(B) | Motor power inputs | Split high-voltage supply connections to upper/lower halves of H-bridge; reduce layout inductance |
| GND | Ground reference | Common return for logic, sense, and power paths; multiple pins enhance thermal and noise performance |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar chopper drive | Enables high-efficiency constant-current control without external PWM controller or gate drivers |
| Integrated H-bridge with protection diodes | Reduces BOM count by eliminating four external flyback diodes and simplifying PCB layout |
| Programmable off-time (toff) | Allows optimization of chopper frequency and current ripple for specific motor inductance and speed |
| Three-level discrete current selection | Supports torque scaling (e.g., full torque for acceleration, reduced torque for holding) via simple GPIO control |
| Pre-alarm thermal output | Provides early warning at ~170 °C-enables graceful current reduction before thermal shutdown at 150 °C |
Applications
| Industrial CNC Axis Control | Automated Laboratory Instrumentation |
|---|---|
|
Use Scenario: Precise open-loop positioning of X/Y/Z axes in benchtop CNC mills and engravers. IC Role / Device Role / Timing Role: Single-winding chopper driver regulating 1.2 A peak current per phase with PHASE-controlled direction and IN0/IN1-selected microstep-compatible current levels. Use Value: Enables smooth low-speed operation and consistent torque across 0–1000 RPM without external current-sense amplifiers or MOSFET drivers. |
Use Scenario: Positioning of syringe pumps, filter wheels, and sample carousels in diagnostic analyzers. IC Role / Device Role / Timing Role: Bipolar driver managing one motor winding with pre-alarm monitoring to prevent thermal drift during extended dwell cycles. Use Value: Maintains positional accuracy over 8+ hour runs by triggering firmware-based current rollback upon PRE-ALARM assertion. |
| Printed Circuit Board Router | 3D Printer Extruder Motion |
|
Use Scenario: High-duty-cycle movement of routing spindles in PCB depaneling machines. IC Role / Device Role / Timing Role: Constant-current regulator operating at 45 V VS with 1.5 A max output, using PULSE TIME-tuned toff for minimal audible noise at 25 kHz switching. Use Value: Eliminates need for heatsinks in compact enclosures due to SO20 package's 60 °C/W Rth(j-a) and pre-alarm derating. |
Use Scenario: Dual-winding control in direct-drive extruders requiring independent current tuning per phase. IC Role / Device Role / Timing Role: One E-TEA3718SFPTR per winding, with REFERENCE voltage modulated by DAC to dynamically adjust extrusion force based on filament type. Use Value: Achieves ±0.5% current stability across ambient temperatures (0–70 °C), improving layer adhesion consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bipolar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | Higher 4.5 A rating, external MOSFETs, no integrated diodes, requires gate driver and current sense amp | Used in high-torque NEMA 34 systems where board space permits discrete power stage | Select when >2 A per phase is required and thermal design allows larger footprint |
| DRV8811PWPR | Integrated current regulation, 1.8 A max, SPI interface, no pre-alarm output, 16-pin HTSSOP | Preferred for microcontroller-based systems needing digital diagnostics and closed-loop feedback | Select when SPI configurability and fault reporting outweigh need for analog thermal warning |
Compared with TB6600HG and DRV8811PWPR, E-TEA3718SFPTR offers unique value in cost-sensitive, analog-controlled industrial motion systems where SO20 packaging, built-in diodes, and pre-alarm signaling simplify design and improve thermal predictability without added ICs.
Availability
E-TEA3718SFPTR is available at Aetrix Electronics and suitable for industrial CNC axis control, automated laboratory instrumentation, PCB routing equipment, and 3D printer extruder motion requiring stable component supply and long-term production continuity.
Supply support for E-TEA3718SFPTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, designing and manufacturing analog, MCU, power, and sensor solutions for industrial, automotive, and consumer markets.
E-TEA3718SFPTR belongs to ST's legacy motor driver IC family targeting cost-effective, robust bipolar stepper control in non-automotive industrial applications-designed for reliability under unstabilized supply conditions and wide ambient temperature ranges.
FAQ
What is the function of the PRE-ALARM pin on E-TEA3718SFPTR?
The PRE-ALARM pin is an open-drain output that goes low when the silicon junction temperature reaches approximately 170 °C. Unlike the ALARM output on other TEA3718 variants, this signal provides early thermal warning-allowing host firmware to reduce current or pause motion before reaching the 150 °C absolute maximum junction temperature or triggering full shutdown.
Can E-TEA3718SFPTR drive a unipolar stepper motor?
No. E-TEA3718SFPTR is specifically designed for bipolar stepper motors and requires two leads per winding. Its H-bridge output stage and PHASE-controlled current reversal are incompatible with unipolar motor topologies, which rely on center-tapped windings and single-direction current switching.
How is current level selected on E-TEA3718SFPTR?
Current level is selected using the IN0 and IN1 logic inputs per the truth table: "L L" = maximum current, "H L" = medium, "L H" = low, and "H H" = zero current. The actual current magnitude depends on the REFERENCE voltage and external sense resistor value (RS), with typical levels ranging from 20 mA to 1.5 A.
What is the purpose of the split VS(A) and VS(B) pins?
VS(A) and VS(B) supply separate halves of the internal H-bridge-VS(A) powers the upper Darlington transistors and VS(B) powers the lower ones. This separation reduces parasitic inductance in high-current switching paths and improves stability during fast current transitions, especially critical in chopper-regulated stepper drivers.
E-TEA3718SFPTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- -
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (2)
- Interface:
- Parallel
- Technology:
- Bipolar
- Step Resolution:
- 1, 1/2
- Applications:
- General Purpose
- Current - Output:
- 1.5A
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 45V
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
E-TEA3718SFPTR FAQ
1.How can I place an order for E-TEA3718SFPTR through Aetrix?
Please submit a Request for Quotation (RFQ) for E-TEA3718SFPTR 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 E-TEA3718SFPTR reliable?
The price and inventory of E-TEA3718SFPTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-TEA3718SFPTR is usually 5 days.
3.What payment methods are accepted for E-TEA3718SFPTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-TEA3718SFPTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-TEA3718SFPTR?
E-TEA3718SFPTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-TEA3718SFPTR 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 E-TEA3718SFPTR?
For technical support, including E-TEA3718SFPTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-TEA3718SFPTR requirements.
6.How does Aetrix verify that E-TEA3718SFPTR is sourced from the original manufacturer or authorized distributors?
All E-TEA3718SFPTR 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 E-TEA3718SFPTR meets industry standards.
7.What is the process for return or replacement of E-TEA3718SFPTR?
All E-TEA3718SFPTR units undergo pre-shipment inspection (PSI). If there is an issue with E-TEA3718SFPTR, 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 E-TEA3718SFPTR part is unused and in its original packaging.
Return procedure for E-TEA3718SFPTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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