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STMicroelectronics E-TEA3718SDP
- Part No.:
- E-TEA3718SDP
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
E-TEA3718SDP.pdf
- Description:
- IC MOTOR DRVR BIPOLAR 16POWERDIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,965
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Product details
Overview
E-TEA3718SDP 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 built-in thermal alarm output, integrated protection diodes, and TTL-compatible logic inputs (IN0, IN1, PHASE). It is used in open-loop motion control for industrial automation actuators.
For engineers reviewing the E-TEA3718SDP datasheet, E-TEA3718SDP pinout, E-TEA3718SDP application, or E-TEA3718SDP equivalent, key selection considerations include its 1.5 A continuous output capability, thermal alarm behavior at junction temperature ≥150 °C, configurable current levels via reference voltage and sense resistor, and compatibility with LS-TTL or microprocessor-based step/direction interfaces.
Technical Context
The TEA3718SDP implements a monostable-based chopper controller with three selectable current thresholds (via IN0/IN1 logic), a Schmidt-triggered PHASE input for direction control, and an H-bridge output stage composed of four Darlington transistors and integrated flyback diodes. Current regulation relies on sensing voltage across an external resistor (SENSE) compared against a programmable reference (REFERENCE).
Its alarm function activates when junction temperature reaches ~150 °C, pulling the ALARM pin low and reducing motor current via internal feedback - not disabling the output entirely. The Power DIP 12+2+2 package provides thermal conduction through GND pins and supports high-power dissipation (Rth(j-c) = 11 °C/W) without requiring pre-alarm functionality.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output current | ±1.5 A continuous - sufficient to drive NEMA 17–23 bipolar stepper motors at full torque without external current amplification. |
| Motor supply range (VS) | 10–50 V - accommodates unstabilized DC supplies common in industrial motor drivers and avoids need for regulated rail. |
| Logic supply (VSS) | 4.75–5.25 V - tightly regulated 5 V requirement ensures reliable TTL-level input interpretation and internal comparator stability. |
| Junction temp limit | 150 °C - triggers ALARM output low and initiates current reduction to prevent thermal runaway during sustained load. |
| Current sense interface | External SENSE resistor + REFERENCE voltage - enables precise current setting (5–1500 mA) via Ohm's Law (I = VREF/RSENSE) and analog adjustment. |
| Switching topology | Monostable-controlled chopper - fixed off-time (toff = 0.69·RTCT) enables predictable current decay and stable regulation across speed ranges. |
| Package thermal resistance | Rth(j-c) = 11 °C/W - allows direct PCB copper heatsinking in Power DIP 12+2+2, supporting >3 W power dissipation at ambient ≤70 °C. |
Pinout & Package
E-TEA3718SDP uses the Power DIP 12+2+2 package (12 main leads + 2 GND + 2 VS), optimized for thermal conduction and high-current motor drive. GND and VS pins are internally bonded to die substrate for low-impedance heat transfer to PCB copper planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA / OUTB | H-bridge output terminals | Drive bidirectional current through one motor winding; form complementary switching pair with internal Darlington transistors and protection diodes. |
| SENSE | Current sense return | Connects to low-side of external sense resistor; feeds voltage proportional to motor current into comparator network. |
| REFERENCE | Analog reference input | Sets threshold voltages (390/230/65 mV) for current comparators; determines absolute current level with RSENSE. |
| IN0 / IN1 | Digital current select | Two-bit logic input selecting zero, low, medium, or max current mode per truth table (Table 8); open-circuit defaults to high. |
| PHASE | Direction control | TTL-compatible input with Schmitt trigger and delay circuit; sets current flow direction (OUTA→OUTB or OUTB→OUTA) without shoot-through risk. |
| PULSE TIME | Chopper off-time timing | RC network sets fixed toff (25–35 ms typical); controls current decay rate and regulates average winding current. |
| ALARM | Thermal fault indicator | Open-collector output pulled low at Tj ≥150 °C; signals thermal overload and initiates current reduction via internal feedback path. |
| VS(A) / VS(B) | Motor power supply inputs | Split VS inputs feed separate halves of H-bridge; enable independent routing and reduce trace inductance in high-current paths. |
| GND | Ground reference | Logic and power ground; multiple pins provide low-impedance return and conduct heat from die to PCB copper area. |
| VSS | Logic supply input | 5 V ±5% supply for internal logic, comparators, and monostable; must be decoupled locally to suppress noise coupling. |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar chopper drive | Enables full-torque, low-heat operation of bipolar stepper motors without external H-bridge or current-sense amplifiers. |
| Three-level programmable current | Supports discrete current settings (low/medium/max) plus analog fine-tuning via REFERENCE voltage - simplifies torque matching across motor variants. |
| Integrated protection diodes | Eliminates need for 4 external flyback diodes in H-bridge layout, reducing BOM count and PCB footprint while ensuring safe inductive kickback handling. |
| Thermal alarm with current foldback | Reduces motor current (not full shutdown) upon overtemperature, maintaining partial actuator function while preventing damage - critical for safety-critical positioning. |
| TTL-compatible step/direction interface | Direct connection to microcontrollers or LS-TTL logic without level-shifting; Schmitt-triggered PHASE input rejects noise in electrically noisy industrial environments. |
Applications
| Industrial CNC Axis Control | Automated Packaging Conveyor |
|---|---|
|
Use Scenario: Precise open-loop positioning of linear actuators in CNC milling machine X/Y axes using NEMA 23 stepper motors. IC Role / Device Role / Timing Role: Constant-current chopper driver regulating 1.2 A per winding in full-step mode; PHASE and IN0/IN1 controlled by FPGA-based motion sequencer. Use Value: Delivers consistent torque across 0–1000 RPM without microstepping IC, leveraging built-in thermal foldback to sustain duty cycles during prolonged cutting passes. |
Use Scenario: Indexing motion of product carriers on high-speed packaging line with intermittent acceleration/deceleration profiles. IC Role / Device Role / Timing Role: Bipolar driver for 42 mm stepper motor controlling cam indexer; receives step pulses from PLC and direction signal from photoeye feedback loop. Use Value: Wide 10–50 V VS range accepts unregulated 24 VDC plant supply; ALARM output interfaces directly with PLC fault input for predictive maintenance alerts before thermal shutdown. |
| Medical Infusion Pump Actuator | Lab Automation Sample Handler |
|
Use Scenario: Controlled syringe advancement in volumetric infusion pump requiring repeatable 0.1 mL increments under variable backpressure. IC Role / Device Role / Timing Role: Single-winding driver operating in half-step mode for smoother motion; REFERENCE voltage adjusted dynamically to compensate for motor heating-induced resistance drift. Use Value: Built-in current sensing eliminates external amplifier, reducing component count and failure points; thermal alarm enables graceful current derating instead of abrupt stop during extended infusions. |
Use Scenario: Carousel rotation and pipette arm positioning in multi-channel liquid handler performing 96-well plate assays. IC Role / Device Role / Timing Role: Dual TEA3718SDP configuration (one per axis) driven by ARM Cortex-M4 MCU; IN0/IN1 set for medium current to balance speed and holding torque. Use Value: Power DIP package enables direct mounting to aluminum chassis for passive cooling; GND/VSA/VSB pin layout minimizes ground bounce in multi-axis synchronized motion. |
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 |
|---|---|---|---|
| L297 + L298N | Separate controller + dual H-bridge; requires external sense resistors, comparators, and timing components; no integrated thermal alarm. | Higher board area and design complexity; suitable only where discrete control tuning is required. | Choose only if needing independent adjustment of chopper frequency or multi-winding coordination beyond single-winding scope. |
| TB6600HG | Higher current (4.5 A), microstepping support, and integrated current DAC; lacks analog REFERENCE input and uses SPI interface instead of TTL logic. | Requires microcontroller firmware integration; unsuitable for simple LS-TTL step/direction systems. | Select when microstepping resolution or higher torque is mandatory, and system already includes SPI-capable host controller. |
Compared with L297+L298N, E-TEA3718SDP reduces bill-of-materials and layout complexity by integrating chopper logic, comparators, and protection diodes; versus TB6600HG, it offers simpler interface and lower cost for basic full/half-step applications without microstepping needs.
Availability
E-TEA3718SDP is available at Aetrix Electronics and suitable for industrial CNC axis control, automated packaging conveyors, medical infusion pump actuators, and lab automation sample handlers requiring stable component supply and long-term obsolescence management.
Supply support for E-TEA3718SDP 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, specializing in power management, motion control, and automotive-grade ICs with strong industrial IP portfolios.
The TEA3718 series was developed specifically for cost-sensitive, high-reliability bipolar stepper motor drive in industrial and medical equipment, emphasizing thermal robustness, minimal external components, and direct TTL interfacing.
FAQ
What is the maximum allowable motor supply voltage for E-TEA3718SDP?
The absolute maximum rating for VS is 50 V, but the recommended operating range is 10–45 V per Table 5. Operating above 45 V increases risk of exceeding junction temperature limits under load, especially with poor PCB heatsinking. For 48 V nominal systems, ensure adequate copper area and airflow to maintain Tj < 150 °C.
Can E-TEA3718SDP drive a unipolar stepper motor?
No - E-TEA3718SDP is strictly a bipolar driver with H-bridge output architecture requiring center-tapped or dual-winding configurations. Unipolar motors require separate phase-enable logic and lack the bidirectional current capability needed for this IC's chopper regulation scheme.
How does the ALARM output behave during thermal overload?
When junction temperature reaches ~150 °C, ALARM goes low and the internal circuit reduces motor current by approximately 50% (per Figure 18), rather than shutting down completely. This foldback maintains partial actuator function while allowing thermal recovery - no external reset is required once temperature drops.
Is external current-sense amplification required?
No - E-TEA3718SDP includes an internal current-sense comparator network referenced to the SENSE pin. Only an external low-inductance sense resistor (e.g., 0.5 Ω metal film) between SENSE and GND is needed; no op-amp or gain stage is required for standard operation.
E-TEA3718SDP 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-TEA3718SDP FAQ
1.How can I place an order for E-TEA3718SDP through Aetrix?
Please submit a Request for Quotation (RFQ) for E-TEA3718SDP 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-TEA3718SDP reliable?
The price and inventory of E-TEA3718SDP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for E-TEA3718SDP is usually 5 days.
3.What payment methods are accepted for E-TEA3718SDP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for E-TEA3718SDP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for E-TEA3718SDP?
E-TEA3718SDP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your E-TEA3718SDP 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-TEA3718SDP?
For technical support, including E-TEA3718SDP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your E-TEA3718SDP requirements.
6.How does Aetrix verify that E-TEA3718SDP is sourced from the original manufacturer or authorized distributors?
All E-TEA3718SDP 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-TEA3718SDP meets industry standards.
7.What is the process for return or replacement of E-TEA3718SDP?
All E-TEA3718SDP units undergo pre-shipment inspection (PSI). If there is an issue with E-TEA3718SDP, 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-TEA3718SDP part is unused and in its original packaging.
Return procedure for E-TEA3718SDP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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