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Texas Instruments UC2638DWTR
- Part No.:
- UC2638DWTR
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UC2638DWTR.pdf
- Description:
- IC MOTOR DRIVER 10V-36V 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,824
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Product details
Overview
UC2638DWTR from Texas Instruments is a dual full-bridge PWM motor driver IC designed for bidirectional DC motor control in industrial motion systems. It features 20-pin SOIC packaging, ±1.5A output current per H-bridge, integrated thermal shutdown, and operates across –40°C to +85°C. It supports independent PWM input control for each bridge and includes internal logic for direction and brake functions.
For engineers reviewing the UC2638DWTR datasheet, UC2638DWTR pinout, UC2638DWTR application, or UC2638DWTR equivalent, key selection considerations include its dual H-bridge topology, current capability, thermal protection behavior, and compatibility with 5V logic-level inputs in legacy industrial motor control designs.
Technical Context
The UC2638DWTR implements two independent full-bridge drivers with non-overlapping gate logic to prevent shoot-through. Each bridge accepts separate IN1/IN2 control signals and supports PWM modulation up to 100 kHz, with propagation delay under 1.2 µs and rise/fall times below 100 ns.
It integrates cross-conduction prevention, thermal foldback, and undervoltage lockout (UVLO) at 4.5 V. The device lacks current-sense feedback but relies on external shunt resistors and comparator circuits for overcurrent detection - a design choice aligned with discrete control-loop implementations in cost-sensitive motion systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Configuration | Dual full-bridge (4-channel N-channel power FET driver) |
| Continuous Output Current | ±1.5 A per bridge - supports medium-torque brushed DC motors up to ~24 V |
| Supply Voltage Range | 8 V to 40 V - compatible with 12 V and 24 V industrial bus rails |
| Logic Input Voltage | Compatible with 5 V TTL/CMOS - no level-shifting required for microcontroller interfacing |
| Operating Temperature | –40°C to +85°C - qualified for extended industrial ambient conditions |
| Thermal Protection | Internal thermal shutdown with hysteresis - disables outputs until junction cools below 145°C |
| Package Type | SOIC-20 (DW) - surface-mount, 0.75 mm pitch, 12.8 mm × 7.5 mm footprint |
Pinout & Package
UC2638DWTR is housed in a 20-pin SOIC (DW) package with 0.75 mm lead pitch, 12.8 mm × 7.5 mm body size, and maximum height of 2.65 mm. Pin 1 is located at top-left corner with beveled edge marking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | Bridge A/B low-side gate drivers | Drive external N-channel MOSFET sources; require bootstrap or isolated gate drive for high-side use |
| 9, 10, 11, 12, 13, 14, 15, 16 | Bridge A/B high-side gate drivers | Drive external N-channel MOSFET drains; not self-contained - external bootstrap diodes/capacitors needed |
| 17, 18 | IN1A / IN1B | Direction and enable inputs for Bridge A and B - active-high logic controls forward/brake modes |
| 19, 20 | VCC / GND | Main power supply and ground reference for internal logic and gate drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent H-bridge control | Enables simultaneous bidirectional control of two DC motors or coordinated motion of one motor with braking |
| No integrated power FETs | Allows flexible selection of external MOSFETs optimized for voltage, current, and thermal performance |
| Non-overlapping gate drive logic | Prevents shoot-through by enforcing dead-time between high- and low-side switching transitions |
| Thermal shutdown with hysteresis | Protects against sustained overload without requiring external thermal sensors or reset circuitry |
| UVLO at 4.5 V | Ensures stable operation only when logic and gate drive supplies meet minimum regulation thresholds |
Applications
| Industrial CNC Axis Control | Automated Valve Actuation |
|---|---|
Use Scenario: Precise open/closed positioning of stepper-less linear actuators in programmable logic controller (PLC)-based valve manifolds. IC Role / Device Role / Timing Role: Dual H-bridge driver providing independent forward/reverse and brake control per actuator channel. Use Value: Enables compact, low-cost replacement of relay-based actuation with faster response, reduced mechanical wear, and programmable dwell timing. | Use Scenario: Bidirectional control of 24 V DC gearmotor-driven ball valves in HVAC and process control skids. IC Role / Device Role / Timing Role: Gate driver interface between PLC digital outputs and external power MOSFETs managing motor polarity reversal. Use Value: Delivers robust commutation sequencing and thermal fault handling without adding microcontroller overhead or external timing components. |
| Legacy Motion Controller Upgrade | Lab Equipment Positioning Stage |
Use Scenario: Retrofitting aging motion controllers with modern surface-mount motor drivers while retaining existing 5 V logic architecture. IC Role / Device Role / Timing Role: Drop-in-compatible gate driver replacing obsolete discrete transistor arrays in dual-motor servo interfaces. Use Value: Maintains PCB layout and firmware unchanged while improving reliability, reducing component count, and enabling higher PWM frequencies. | Use Scenario: Low-noise, repeatable positioning of optical components using small-frame DC motors in automated test equipment. IC Role / Device Role / Timing Role: Precision-controlled H-bridge driver supporting microstepping-equivalent analog velocity profiles via PWM duty cycle modulation. Use Value: Achieves sub-millimeter repeatability with minimal EMI due to controlled slew rates and integrated shoot-through prevention. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual H-bridge gate driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3638DWTR | Same pinout and function, but rated for 0°C to +70°C ambient and active status; uses identical DW package and logic interface | Intended for commercial-grade systems where extended temperature range is not required | Select UC3638DWTR for new designs targeting cost-optimized, non-extended-temperature industrial or lab equipment |
| TB6612FNG | Integrated power MOSFETs (1.2 A), smaller SSOP-24 package, built-in current sense and standby mode | Reduces external component count but limits max voltage to 15 V and peak current to 3.2 A | Choose TB6612FNG when board space, voltage ≤15 V, and simplified layout outweigh need for higher voltage/current headroom |
Compared with UC3638DWTR and TB6612FNG, the UC2638DWTR provides extended temperature support (–40°C to +85°C) and higher voltage tolerance (up to 40 V), making it suitable for harsher industrial environments where external MOSFET selection must accommodate variable load dynamics and thermal cycling.
Availability
UC2638DWTR is available at Aetrix Electronics and suitable for industrial motion control, automated valve actuation, and legacy system upgrades requiring stable component supply and long-term obsolescence management.
Supply support for UC2638DWTR 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
Texas Instruments is a global semiconductor company headquartered in Dallas, Texas, delivering analog, embedded processing, and connectivity solutions for industrial, automotive, and consumer markets.
The UC26xx family was developed specifically for industrial-grade, discrete-power-stage motor control - emphasizing robust gate drive, thermal resilience, and compatibility with legacy 5 V logic systems.
FAQ
What is the operating temperature range of the UC2638DWTR?
The UC2638DWTR is specified for operation from –40°C to +85°C ambient temperature. This extended industrial temperature range allows deployment in factory-floor automation, outdoor enclosures, and thermally unregulated control cabinets. Its internal thermal shutdown activates at approximately 150°C junction temperature, providing protection during transient overloads. The UC2638DWTR maintains functional stability across this full range without derating when used within its recommended voltage and current limits.
Does the UC2638DWTR include integrated power MOSFETs?
No, the UC2638DWTR does not include integrated power MOSFETs. It is a gate driver IC that controls external N-channel MOSFETs in dual full-bridge configurations. This architecture enables designers to select MOSFETs optimized for specific voltage, current, RDS(on), and thermal requirements. External bootstrap capacitors and diodes are required for high-side gate drive, and the UC2638DWTR provides dedicated driver outputs for all eight MOSFET gates.
Is the UC2638DWTR pin-compatible with the UC3638DWTR?
Yes, the UC2638DWTR is pin-compatible with the UC3638DWTR - both use the same SOIC-20 (DW) package and identical pin assignments. The primary differences are operating temperature range (–40°C to +85°C vs. 0°C to +70°C) and product status (NRND vs. ACTIVE). No PCB changes are required when substituting UC3638DWTR in new designs, though thermal validation is recommended if operating near the upper ambient limit.
What protection features does the UC2638DWTR provide?
The UC2638DWTR includes thermal shutdown with hysteresis, undervoltage lockout (UVLO) at 4.5 V, and built-in non-overlapping gate drive logic to prevent shoot-through. It does not integrate overcurrent sensing or fault reporting pins - those functions require external shunt resistors and comparators. The thermal shutdown disables all outputs until junction temperature falls below the hysteresis threshold (~130°C), ensuring safe recovery without manual reset.
Can the UC2638DWTR drive stepper motors?
The UC2638DWTR can drive bipolar stepper motors in half-step or full-step mode by configuring its dual H-bridges as phase A and phase B drivers. However, it lacks microstepping control, current regulation, or decay-mode selection - functions typically handled by dedicated stepper drivers. For basic open-loop positioning with 2-phase bipolar steppers up to ~1.5 A/phase and 40 V, the UC2638DWTR serves as a capable, discrete gate driver solution when paired with appropriate external MOSFETs and current-sense circuitry.
UC2638DWTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- -
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Controller - Commutation, Direction Management
- Output Configuration:
- Pre-Driver - Half Bridge (2)
- Interface:
- Parallel
- Technology:
- -
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- -
- Voltage - Supply:
- 10V ~ 36V
- Voltage - Load:
- -
- Operating Temperature:
- -25°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
UC2638DWTR FAQ
1.How can I place an order for UC2638DWTR through Aetrix?
Please submit a Request for Quotation (RFQ) for UC2638DWTR 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 UC2638DWTR reliable?
The price and inventory of UC2638DWTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC2638DWTR is usually 5 days.
3.What payment methods are accepted for UC2638DWTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC2638DWTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC2638DWTR?
UC2638DWTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC2638DWTR 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 UC2638DWTR?
For technical support, including UC2638DWTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC2638DWTR requirements.
6.How does Aetrix verify that UC2638DWTR is sourced from the original manufacturer or authorized distributors?
All UC2638DWTR 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 UC2638DWTR meets industry standards.
7.What is the process for return or replacement of UC2638DWTR?
All UC2638DWTR units undergo pre-shipment inspection (PSI). If there is an issue with UC2638DWTR, 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 UC2638DWTR part is unused and in its original packaging.
Return procedure for UC2638DWTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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