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STMicroelectronics TEA3718SFP
- Part No.:
- TEA3718SFP
- Manufacturer:
- STMicroelectronics
- Category:
- Motor Drivers, Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
TEA3718SFP.pdf
- Description:
- IC MTR DRV BIPLR 4.75-5.25V 20SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,409
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Product details
Overview
TEA3718SFP 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 modes, delivers up to 1.5 A output current, operates from 10–45 V motor supply (VS), features pre-alarm output for thermal monitoring, and uses an external sense resistor with three selectable current levels via IN0/IN1 logic inputs.
For engineers reviewing the TEA3718SFP datasheet, TEA3718SFP pinout, TEA3718SFP application, or TEA3718SFP equivalent, this device is selected for precision open-loop motion control where thermal-aware current regulation, TTL-compatible logic interfacing, and SO20-packaged integration into microprocessor-driven systems are required.
Technical Context
The TEA3718SFP implements a monostable-based chopper controller with three comparator thresholds (VCH/VCM/VCL) selected by IN0/IN1, enabling discrete current level selection (off, low, medium, max). Its H-bridge output stage consists of four Darlington transistors and integrated protection diodes, driven by phase-controlled logic with Schmitt-triggered PHASE input and built-in short-circuit prevention delay.
Current regulation relies on sensing voltage across an external resistor (RS), compared against a reference voltage (VR) applied to the REFERENCE pin. The pulse time (toff = 0.69·RT·CT) sets decay duration, while thermal protection activates PRE-ALARM at ~170 °C junction temperature - unique to the SFP variant among TEA3718 family members.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.5 A maximum - supports NEMA 17–23 bipolar stepper motors with adequate heatsinking. |
| Motor Supply Range (VS) | 10–45 V - accommodates unstabilized DC supplies common in industrial motion systems. |
| Logic Supply (VSS) | 4.75–5.25 V - tightly regulated 5 V domain for TTL-compatible input interfacing. |
| Current Sensing | External RS resistor + internal comparators - enables precise, adjustable current thresholds (e.g., 20 mA–1.2 A range per truth table). |
| Thermal Protection | PRE-ALARM output active low at TJ ≈ 170 °C - provides early warning before shutdown, allowing system-level thermal management. |
| Package Thermal Resistance | Rth(j-a) = 60 °C/W (SO20 on 4 cm² copper) - defines maximum power dissipation (~3.1 W at 1 A) under standard PCB layout. |
| Switching Frequency | Typical fchop ≈ 30 kHz - balances EMI, efficiency, and motor torque ripple in constant-current mode. |
Pinout & Package
TEA3718SFP is housed in a 20-pin Small Outline (SO20) package with gull-wing leads, ECOPACK® compliant, rated for 0–70 °C ambient operation. Pin 1 is located at the top-left corner (notch or mark side), with pins numbered counter-clockwise.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| OUTA / OUTB | H-bridge output terminals | Drive opposite ends of a single motor winding; form bidirectional current path with PHASE control. |
| PHASE | Direction control input | TTL/Schmitt-triggered logic input that sets current flow direction (OUTA→OUTB or OUTB→OUTA); includes internal delay to prevent shoot-through. |
| IN0 / IN1 | Current level select inputs | Two-bit logic interface selecting off, low, medium, or max current per truth table; open inputs default high. |
| REFERENCE | Analog reference voltage input | Accepts 0–5 V reference (typ. 5 V) to set comparator thresholds; combined with RS determines actual current magnitude. |
| SENSE RESISTOR | Current sense return | Connection point for external sense resistor (RS); feeds filtered voltage to internal comparators for current feedback. |
| PULSE TIME | Chopper timing network node | Connects RC network (RT/CT) to set fixed off-time (toff = 0.69·RT·CT) during current decay phase. |
| PRE-ALARM | Thermal pre-warning output | Active-low open-collector output asserting at TJ ≈ 170 °C - distinct from ALARM in SP/DP variants; enables predictive thermal response. |
| VS(A) / VS(B) | Motor power supply inputs | Split VS pins reduce internal routing losses; both must be connected to same 10–45 V supply rail. |
| VSS | Logic supply input | 5 V ±5% supply for internal logic, comparators, and input buffers; independent of VS domain. |
| GND | Common reference | Ground return for logic, sense circuitry, and heat conduction path (pins 10 & 20 serve dual thermal/electrical role). |
Key Features
| Feature | Design Value |
|---|---|
| Bipolar H-bridge with integrated diodes | Four Darlington transistors + clamping diodes eliminate need for external flyback components in standard configurations. |
| Three-level programmable current control | Discrete current settings (low/medium/max) plus off-state via two logic inputs - simplifies microcontroller GPIO usage. |
| Pre-alarm thermal output | Dedicated PRE-ALARM pin (not ALARM) enables staged thermal response - e.g., reduce step rate before fault shutdown. |
| Unstabilized motor supply support | VS tolerance (10–45 V) and independent VSS domain allow direct connection to unregulated DC bus without LDO overhead. |
| Switch-mode chopper regulation | Monostable-based current chopping at ~30 kHz maintains torque at speed while minimizing resistive heating in windings. |
Applications
| Industrial CNC Positioning | Medical Infusion Pumps |
|---|---|
|
Use Scenario: Open-loop positioning of X/Y axes in benchtop CNC mills using NEMA 17 stepper motors. IC Role / Device Role / Timing Role: Single-winding chopper driver regulating 1.2 A peak current with PHASE-controlled direction and IN0/IN1-set microstepping resolution. Use Value: Enables smooth low-speed torque and consistent step accuracy without closed-loop feedback, leveraging built-in thermal pre-alarm to avoid motor stall-induced overheating. |
Use Scenario: Precise volumetric delivery in portable IV infusion pumps requiring silent, reliable motor actuation. IC Role / Device Role / Timing Role: Bipolar driver controlling one winding of a 2-phase hybrid stepper, synchronized to microcontroller step pulses and PHASE toggles. Use Value: SO20 footprint minimizes board space; PRE-ALARM allows pump firmware to throttle flow rate before thermal shutdown, maintaining dose integrity. |
| Automated Laboratory Equipment | 3D Printer Extruder Control |
|
Use Scenario: Sample carousel rotation and reagent dispensing in automated analyzers with duty-cycle-limited operation. IC Role / Device Role / Timing Role: Constant-current driver managing intermittent 0.8–1.5 A bursts per winding, coordinated via TTL-level step/dir signals from FPGA. Use Value: Built-in protection diodes and thermal pre-alarm reduce BOM count and improve field reliability in unattended multi-hour runs. |
Use Scenario: Filament feed control in compact FDM 3D printers where board area and thermal margin are constrained. IC Role / Device Role / Timing Role: Stepper driver for extruder motor, using analog-adjustable VR to fine-tune current for different filament types (PLA vs. TPU). Use Value: External RS + VR adjustment allows real-time current tuning without firmware change; SO20 package fits tight mechanical envelopes. |
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 | Two-chip solution (controller + dual H-bridge); requires external sense resistors, no integrated pre-alarm, higher board area. | Supports dual-winding drive natively; lacks single-chip thermal intelligence and SO20 integration. | Choose when driving two windings independently or needing >1.5 A per channel with discrete design control. |
| TB6600HG | Higher current (4.5 A), microstepping support, but larger HTSSOP-28 package and no pre-alarm output. | Targets high-torque applications; lacks the TEA3718SFP's thermal warning capability and simple 2-bit current selection. | Choose for applications requiring finer current resolution or >1.5 A, accepting trade-offs in thermal visibility and logic simplicity. |
Compared with L297+L298N and TB6600HG, TEA3718SFP offers the smallest footprint for single-winding bipolar drive with embedded thermal pre-warning - critical for space-constrained, thermally sensitive embedded motion systems where predictive thermal management outweighs microstepping or dual-channel needs.
Availability
TEA3718SFP is available at Aetrix Electronics and suitable for industrial CNC positioning, medical infusion pumps, automated laboratory equipment, and 3D printer extruder control requiring stable component supply and long-term obsolescence management.
Supply support for TEA3718SFP 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.
The TEA3718 belongs to ST's legacy motor driver IC product line, engineered specifically for cost-sensitive, space-constrained bipolar stepper applications requiring robust thermal behavior and minimal external components.
FAQ
What is the maximum continuous output current rating for TEA3718SFP?
The TEA3718SFP is rated for ±1.5 A maximum output current under recommended operating conditions (Tamb = 0–70 °C, SO20 package on 4 cm² copper). Derating is required above 70 °C ambient or with reduced PCB copper area; thermal pre-alarm triggers at ~170 °C junction temperature to warn before current limitation.
Can TEA3718SFP drive a full bipolar stepper motor (two windings) alone?
No - TEA3718SFP controls only one motor winding. A complete two-phase bipolar stepper driver requires two TEA3718SFP ICs, each handling one winding, with coordinated PHASE and step inputs. This architecture is explicitly documented in the datasheet's "typical application" section.
How does the PRE-ALARM output differ from ALARM in other TEA3718 variants?
TEA3718SFP uses PRE-ALARM (active-low at TJ ≈ 170 °C) instead of ALARM (active-low at TJ ≈ 150 °C in SP/DP variants). This provides earlier thermal warning, allowing system-level intervention before hard shutdown - a key distinction confirmed in Table 3 and Section 4.2 of the datasheet.
What external components are mandatory for basic TEA3718SFP operation?
Mandatory components include: (1) external sense resistor (RS) between SENSE RESISTOR and GND, (2) RC network (RT/CT) on PULSE TIME for off-time setting, (3) reference voltage source (0–5 V) on REFERENCE, and (4) decoupling capacitors (e.g., 100 nF ceramic) on VSS and VS. The datasheet Figure 20 shows this minimal configuration.
TEA3718SFP Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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
TEA3718SFP FAQ
1.How can I place an order for TEA3718SFP through Aetrix?
Please submit a Request for Quotation (RFQ) for TEA3718SFP 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 TEA3718SFP reliable?
The price and inventory of TEA3718SFP are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TEA3718SFP is usually 5 days.
3.What payment methods are accepted for TEA3718SFP?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TEA3718SFP transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TEA3718SFP?
TEA3718SFP orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TEA3718SFP 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 TEA3718SFP?
For technical support, including TEA3718SFP datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TEA3718SFP requirements.
6.How does Aetrix verify that TEA3718SFP is sourced from the original manufacturer or authorized distributors?
All TEA3718SFP 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 TEA3718SFP meets industry standards.
7.What is the process for return or replacement of TEA3718SFP?
All TEA3718SFP units undergo pre-shipment inspection (PSI). If there is an issue with TEA3718SFP, 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 TEA3718SFP part is unused and in its original packaging.
Return procedure for TEA3718SFP:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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