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STMicroelectronics E-TEA3718DP
- Part No.:
- E-TEA3718DP
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
E-TEA3718DP.pdf
- Description:
- IC MOTOR DRVR BIPOLAR 16POWERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:852
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Product details
Overview
E-TEA3718DP 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), features built-in protection diodes, thermal overload protection with ALARM output, and accepts LS-TTL-compatible logic inputs (IN0, IN1, PHASE) for current level and direction control - used in industrial motion controllers and CNC positioning modules.
For engineers reviewing the E-TEA3718DP datasheet, E-TEA3718DP pinout, E-TEA3718DP application, or E-TEA3718DP equivalent, key selection criteria include its 1.5 A continuous output capability, integrated H-bridge output stage with Darlington transistors, programmable current levels via two logic inputs, thermal alarm signaling, and compatibility with unstabilized motor supplies in open-loop stepper systems.
Technical Context
The TEA3718DP implements a current-regulated chopper drive using a monostable pulse generator triggered by comparator outputs. Three internal comparators-selected via IN0/IN1-compare sensed voltage across an external sense resistor (RS) against reference voltages (VCH/VCM/VCL) to determine current thresholds. The resulting pulse width (toff = 0.69·RT·CT) controls off-time of the lower power transistors, enabling precise average current regulation.
Its output stage is a fully integrated H-bridge with four Darlington transistors and built-in flyback diodes, supporting bidirectional current flow controlled by the PHASE input. The ALARM output asserts low at junction temperature ≥150 °C, disabling or reducing motor current depending on external RC network configuration - no pre-alarm function is implemented in the DP variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.5 A maximum - enables driving mid-torque bipolar stepper motors (e.g., NEMA 17/23) without external current amplification. |
| Motor Supply Range (VS) | 10–50 V - supports wide-range unregulated DC supplies common in industrial motor drives. |
| Logic Supply (VSS) | 4.75–5.25 V - requires stable 5 V TTL-level supply for internal logic and comparators. |
| Current Regulation Accuracy | Three discrete levels (low/medium/max) + zero - set by IN0/IN1 truth table; actual current determined by RS and VR. |
| Thermal Protection | ALARM output active-low at TJ ≥150 °C - triggers system-level shutdown or current reduction via external RC feedback. |
| Switching Frequency | Typical 30 kHz - high enough to avoid audible noise while maintaining efficient power delivery and thermal management. |
| Input Logic Compatibility | LS-TTL - ensures direct interfacing with microcontrollers, FPGAs, and legacy industrial PLC outputs without level-shifting. |
Pinout & Package
E-TEA3718DP uses Power DIP package (12+2+2 pin layout), thermally optimized for through-hole mounting on copper-clad PCBs. Package includes dedicated heat-conducting pins (GND, VS(A), VS(B)) tied to internal die substrate for enhanced thermal dissipation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA / OUTB | H-bridge output terminals | Connect to opposite ends of one stepper motor winding; polarity reversal controlled by PHASE input. |
| SENSE RESISTOR | Current sense return path | Low-side connection point for external sense resistor (RS); feeds comparator input via RC filter. |
| PHASE | Direction control input | TTL-compatible signal determining current flow direction (OUTA→OUTB or OUTB→OUTA). |
| IN0 / IN1 | Current level select inputs | Two-bit logic selects one of three current thresholds (or zero) per truth table in datasheet Section 5.2. |
| PULSE TIME | Monostable timing node | RC network (RT/CT) sets off-time (toff) for chopper regulation; determines current decay rate. |
| ALARM | Thermal fault indicator | Open-collector output pulled low when junction temperature exceeds 150 °C; requires external pull-up. |
| REFERENCE | Comparator reference voltage input | Analog voltage (typically 5 V) sets baseline for all three current thresholds via internal divider. |
| VS(A) / VS(B) | Motor power supply inputs | Split 10–50 V supply connections feeding upper/lower halves of H-bridge; improves thermal distribution. |
| VSS | Logic supply input | 5 V supply for internal logic, comparators, and timing circuitry; must be decoupled locally. |
| GND | Common reference and thermal path | Ground return for logic, sense circuit, and motor current; also serves as primary heat conduction path. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar chopper drive | Enables high-efficiency, low-heat operation of bipolar stepper windings without external PWM controllers. |
| Integrated H-bridge with protection diodes | Eliminates need for external flyback diodes and reduces board space versus discrete MOSFET solutions. |
| Three-step programmable current control | Allows dynamic torque scaling (e.g., full torque for acceleration, reduced for holding) via simple logic signals. |
| Thermal alarm with configurable response | ALARM output enables fail-safe current reduction or shutdown - behavior tailored via external RC network. |
| Unstabilized motor supply support | Accepts wide 10–50 V range without regulation, simplifying power architecture in cost-sensitive motion systems. |
Applications
| Industrial CNC Positioning | Automated Packaging Machinery |
|---|---|
|
Use Scenario: Open-loop position control of X/Y axes in benchtop CNC mills using NEMA 17 stepper motors. IC Role / Device Role / Timing Role: Single-winding current regulator implementing chopper-based constant-current drive synchronized to step pulses. Use Value: Delivers consistent torque across speed range without external current-sense amplifiers or gate drivers. |
Use Scenario: Indexing conveyor belts and rotary feeders in food packaging lines requiring repeatable 1.8° step resolution. IC Role / Device Role / Timing Role: Bipolar winding controller accepting step/direction signals from PLC; manages current decay timing via PULSE TIME RC network. Use Value: Enables reliable microstepping-capable full/half-step operation with built-in thermal fault signaling for uptime-critical production. |
| Lab Equipment Motion Control | 3D Printer Extruder Drive |
|
Use Scenario: Precision Z-axis lift in automated microscope stages where low-vibration, quiet operation is essential. IC Role / Device Role / Timing Role: Constant-current driver regulating one winding under microcontroller command; PHASE input controls upward/downward motion. Use Value: 30 kHz switching frequency avoids audible noise; integrated diodes prevent back-EMF damage during rapid direction changes. |
Use Scenario: Driven filament extrusion mechanism in desktop 3D printers using bipolar 42BYGH stepper motors. IC Role / Device Role / Timing Role: Winding current controller responding to G-code-generated step pulses; ALARM output connected to printer host for thermal fault reporting. Use Value: Supports 1.5 A peak current needed for high-torque extrusion while providing overtemperature protection without added sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar bipolar stepper motor winding control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| L297 + L298N | Two-chip solution: L297 generates control logic; L298N provides dual H-bridge (2A per channel). Requires external sense resistors and timing components. | Supports dual-winding drive out-of-box; better suited for 2-phase full-stepping without doubling IC count. | Select when needing independent control of both windings or higher current (2A) per channel. |
| TB6600HG | Single-chip microstepping driver with integrated oscillator; supports up to 1/32 microstep; 4A max current; requires external power MOSFETs. | Offers finer position resolution and higher current; lacks integrated protection diodes and uses external FETs. | Select when microstepping precision and >1.5A current are required, and board space allows external FET layout. |
Compared with L297+L298N and TB6600HG, E-TEA3718DP offers simpler single-winding integration with built-in diodes and thermal alarm, making it optimal for cost-sensitive, space-constrained, or single-axis industrial motion where full/half-step suffices and 1.5A is adequate.
Availability
E-TEA3718DP is available at Aetrix Electronics and suitable for industrial CNC positioning, automated packaging machinery, lab equipment motion control, and 3D printer extruder drive applications requiring stable component supply and long-term obsolescence management.
Supply support for E-TEA3718DP 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-TEA3718DP belongs to ST's legacy motor driver IC family targeting cost-effective, robust open-loop stepper control - engineered for reliability in factory automation and precision instrumentation where thermal resilience and minimal external components are critical.
FAQ
What is the maximum continuous output current supported by E-TEA3718DP?
E-TEA3718DP supports ±1.5 A continuous output current per winding, verified under recommended operating conditions (Tamb = 0–70 °C, VS = 10–45 V, Im = 1 A, fs = 30 kHz). Derating is required above 70 °C ambient or with inadequate PCB copper area; thermal resistance Rth(j-a) is 45 °C/W for Power DIP mounted on 4 cm² copper.
Does E-TEA3718DP support microstepping?
No, E-TEA3718DP does not support microstepping. It implements full-step and half-step modes only, controlled by PHASE and clocked step inputs. Microstepping requires external phase interpolation circuitry or a dedicated microstepping controller - this IC performs fixed-current chopper regulation per selected winding.
How is thermal protection implemented, and what happens when ALARM activates?
ALARM asserts low when junction temperature reaches 150 °C. Its behavior depends on external RC network connected to the ALARM pin: with RC > 80 Ω, the output stage shuts off completely; with RC > 60 Ω, motor current reduces approximately by half. No pre-alarm function exists in the DP variant - unlike SFP/SO20 versions.
Can E-TEA3718DP drive both windings of a bipolar stepper motor?
No - E-TEA3718DP drives only one winding. A complete two-phase bipolar stepper driver requires two E-TEA3718DP ICs (one per winding), plus shared logic inputs (PHASE, IN0, IN1) and separate PULSE TIME timing networks. This dual-IC approach is explicitly documented in the datasheet's Figure 1 and Section 1.
E-TEA3718DP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- 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:
- Through Hole
- Supplier Device Package:
- 16-PowerDIP
E-TEA3718DP FAQ
1.How can I place an order for E-TEA3718DP through Aetrix?
Please submit a Request for Quotation (RFQ) for E-TEA3718DP 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-TEA3718DP reliable?
The price and inventory of E-TEA3718DP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-TEA3718DP is usually 5 days.
3.What payment methods are accepted for E-TEA3718DP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-TEA3718DP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-TEA3718DP?
E-TEA3718DP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-TEA3718DP 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-TEA3718DP?
For technical support, including E-TEA3718DP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-TEA3718DP requirements.
6.How does Aetrix verify that E-TEA3718DP is sourced from the original manufacturer or authorized distributors?
All E-TEA3718DP 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-TEA3718DP meets industry standards.
7.What is the process for return or replacement of E-TEA3718DP?
All E-TEA3718DP units undergo pre-shipment inspection (PSI). If there is an issue with E-TEA3718DP, 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-TEA3718DP part is unused and in its original packaging.
Return procedure for E-TEA3718DP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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