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Texas Instruments UC3708N
- Part No.:
- UC3708N
- Manufacturer:
- Texas Instruments
- Category:
- Gate Drivers
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3708N.pdf
- Description:
- IC GATE DRVR LOW-SIDE 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:347
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Product details
Overview
UC3708N from Texas Instruments is a dual non-inverting power driver IC designed to interface TTL/CMOS logic with high-power MOSFETs in switching applications. It delivers 3.0 A peak source/sink per channel, operates from 5 V to 35 V, features 25 ns rise/fall times and 25 ns propagation delays, and supports independent or common shutdown via dedicated Shutdown and Enable inputs - used in motor gate drive and DC-DC converter half-bridge control.
For engineers reviewing the UC3708N datasheet, UC3708N pinout, UC3708N application, or UC3708N equivalent, this page provides verified technical context, package-specific pin mapping for the 8-pin PDIP variant, real-world application scenarios, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The UC3708N implements two independent totem-pole output stages with internal biasing and thermal shutdown circuitry. Each channel accepts logic-level inputs compatible with TTL and CMOS, tolerating input voltages up to VIN, and drives external N-channel MOSFETs directly without external level-shifting.
Its Enable input places the device into under-voltage lockout (reducing supply current by up to 90%), while the Shutdown input forces both outputs low without affecting internal logic states. The device lacks integrated shutdown functionality in J/N-package variants per TI documentation - confirming UC3708N's Shutdown terminal is inactive.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 5 V to 35 V - supports wide-input industrial and automotive DC bus rails without external regulation. |
| Peak Output Current | 3.0 A per channel - sufficient to drive medium-power MOSFET gates at high frequency without external buffers. |
| Rise/Fall Time | 25 ns - enables clean switching at >1 MHz in resonant or synchronous rectifier topologies. |
| Propagation Delay | 25 ns - ensures tight timing alignment between control logic and power stage transitions. |
| Operating Temperature | 0°C to 70°C - rated for commercial-grade embedded systems and industrial control panels. |
| Input Logic Compatibility | TTL/CMOS - allows direct connection to microcontrollers, FPGAs, and PWM controllers without level translators. |
| Thermal Shutdown Threshold | 155°C - protects against latch-up or bond-wire failure during sustained overload or poor heatsinking. |
Pinout & Package
UC3708N is packaged in an 8-pin plastic dual in-line package (PDIP), with 0.3-inch body width and standard through-hole mounting. Pin 1 is located at the left end of the top row when viewed from the top with notch or dot orientation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: Input A | Channel A logic input | Accepts TTL/CMOS signals; voltage-tolerant up to VIN - drives output A non-inverting. |
| 2: Gnd | Logic ground reference | Common return for input logic and internal bias circuitry; must be low-impedance to minimize noise coupling. |
| 3: Input B | Channel B logic input | Independent control of output B; identical electrical specs to Input A. |
| 4: Output A | Channel A totem-pole output | Sources or sinks up to 3 A; connects directly to gate of N-MOSFET in high-side or low-side configuration. |
| 5: NC | No connect | Internally unconnected; must remain floating - no routing or grounding permitted. |
| 6: Output B | Channel B totem-pole output | Electrically isolated from Output A; enables independent or complementary drive of two MOSFETs. |
| 7: VIN | Main power supply input | Supplies both output stages and internal regulators; requires local 10 µF ceramic + bulk electrolytic decoupling. |
| 8: Enable | Global enable/disable control | Low = UVLO active (outputs disabled, ~90% supply current reduction); high = normal operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent totem-pole drivers | Enables simultaneous or phase-shifted control of two power switches - essential for half-bridge, H-bridge, and dual-phase SMPS designs. |
| 35 V absolute max supply rating | Allows safe operation with 24 V or 32 V DC bus transients without external clamping or derating. |
| 25 ns propagation delay | Minimizes dead-time uncertainty in synchronous rectifiers and reduces shoot-through risk in bridge configurations. |
| Enable-controlled under-voltage lockout | Reduces quiescent current to ≤4 mA during brown-out, preventing erratic switching during power-up/down sequences. |
| ESD protection (2 kV HBM) | Provides robust handling during PCB assembly and field service without requiring additional input protection networks. |
Applications
| Motor Gate Drive | DC-DC Converter Control |
|---|---|
|
Use Scenario: Driving N-channel MOSFETs in brushed DC motor H-bridge circuits with microcontroller PWM inputs. IC Role / Device Role / Timing Role: Dual-channel non-inverting driver translating logic-level PWM into high-current gate drive for upper/lower FETs. Use Value: 3 A peak current eliminates need for discrete buffer transistors; 25 ns timing ensures precise commutation and reduced switching loss. |
Use Scenario: Controlling synchronous rectification in isolated forward or flyback converters operating at 200–500 kHz. IC Role / Device Role / Timing Role: Gate driver for secondary-side synchronous MOSFETs, synchronized to primary-side controller via optocoupler or transformer feedback. Use Value: Low propagation delay (<25 ns) and matched rise/fall times minimize body-diode conduction time and improve efficiency by >2% at full load. |
| Industrial PLC Output Stage | Power Supply Sequencing |
|
Use Scenario: Solid-state relay replacement in programmable logic controller (PLC) digital output modules driving solenoids and indicator lamps. IC Role / Device Role / Timing Role: High-current switch driver interfacing 3.3 V/5 V FPGA I/O to 12–24 V industrial loads. Use Value: 35 V supply rating accommodates 24 V nominal rails with surge tolerance; thermal shutdown prevents damage during short-circuit faults. |
Use Scenario: Enabling/disabling multiple voltage rails (e.g., 12 V, 5 V, 3.3 V) in sequence during system power-up using microcontroller GPIOs. IC Role / Device Role / Timing Role: Dual-channel power switch controller activated via Enable pin and individual Input A/B signals for staggered turn-on. Use Value: Enable input provides global rail disable with <4 mA standby current; independent inputs allow flexible sequencing without extra logic gates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-channel power driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| UC3708NE | 16-pin PDIP package with active Shutdown pin; same electrical specs and temperature range (0°C to 70°C). | Supports hardware-based forced-output-low functionality via Shutdown input - required in fail-safe motor control or emergency stop circuits. | Select UC3708NE if system-level safety mandates active shutdown capability; UC3708N lacks functional Shutdown per TI datasheet. |
| UC2708N | Same 8-pin PDIP package and pinout; rated for –40°C to 85°C industrial temperature range; otherwise identical electrical performance. | Validated for extended ambient conditions in outdoor enclosures or uncooled industrial environments where UC3708N's 0°C lower limit is insufficient. | Choose UC2708N for wider temperature operation; note that UC3708N is not qualified below 0°C and may exhibit parametric drift or startup failure at sub-zero temperatures. |
Compared with UC3708NE and UC2708N, the UC3708N offers cost-optimized commercial-temperature operation with simplified enable-only control - making it ideal for indoor, temperature-stable applications where shutdown functionality is managed externally or unnecessary.
Availability
UC3708N is available at Aetrix Electronics and suitable for motor gate drive, DC-DC converter control, and industrial PLC output stages requiring stable component supply across production lifecycles.
Supply support for UC3708N 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 leader specializing in analog, embedded processing, and power management technologies with over 50 years of innovation in high-reliability driver and interface ICs.
The UC3708N belongs to TI's legacy UC1708/UC2708/UC3708 family of high-speed power drivers, engineered specifically for robust gate-driving of power MOSFETs in industrial motor control and switched-mode power supplies.
FAQ
What is the function of the Enable pin on the UC3708N?
The Enable pin on the UC3708N controls global device activation: a logic high enables normal operation, while a logic low places the IC into under-voltage lockout mode, reducing supply current by up to 90% and forcing both outputs into a self-biasing low-voltage state. This feature is fully functional on the UC3708N and is critical for power sequencing and energy-efficient standby modes.
Does the UC3708N support active shutdown functionality?
No - the UC3708N does not support active shutdown. Per TI's SLUS171C datasheet, the Shutdown feature is explicitly unavailable in J- and N-package variants, including UC3708N. Only JE, NE, and DW packages implement functional Shutdown pins; UC3708N users must manage forced-output-low externally via Input A/B control or upstream logic.
What is the maximum continuous output current rating for UC3708N?
The UC3708N is rated for 3.0 A peak source/sink current per channel under transient conditions, but continuous current is thermally limited. At 25°C ambient with minimal PCB copper, sustained output current should not exceed 1.2 A per channel to maintain junction temperature below 150°C. Derating is required above 25°C ambient per TI's thermal specifications in the datasheet.
Can UC3708N drive both high-side and low-side N-MOSFETs in a half-bridge?
Yes - the UC3708N can drive either high-side or low-side N-MOSFETs, but not both simultaneously in a single-ended half-bridge without external level-shifting. Its outputs are ground-referenced, so high-side drive requires a floating supply or charge pump. For true half-bridge operation, UC3708N is typically paired with a dedicated high-side driver or used in low-side configurations only.
What package type and pin count does UC3708N use?
The UC3708N uses an 8-pin plastic dual in-line package (PDIP) with 0.3-inch width and through-hole mounting. Its pinout is standardized per TI's DIL-8 diagram: Pin 1 = Input A, Pin 2 = Gnd, Pin 3 = Input B, Pin 4 = Output A, Pin 5 = NC, Pin 6 = Output B, Pin 7 = VIN, Pin 8 = Enable. No alternate package variants exist for the UC3708N ordering code.
UC3708N Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Programmable:
- Not Verified
- Driven Configuration:
- Low-Side
- Channel Type:
- Independent
- Number of Drivers:
- 2
- Gate Type:
- N-Channel, P-Channel MOSFET
- Voltage - Supply:
- 5V ~ 35V
- Logic Voltage - VIL, VIH:
- 0.8V, 2V
- Current - Peak Output (Source, Sink):
- 3A, 3A
- Input Type:
- Non-Inverting
- High Side Voltage - Max (Bootstrap):
- -
- Rise / Fall Time (Typ):
- 25ns, 25ns
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 8-PDIP
UC3708N FAQ
1.How can I place an order for UC3708N through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3708N 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 UC3708N reliable?
The price and inventory of UC3708N are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3708N is usually 5 days.
3.What payment methods are accepted for UC3708N?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3708N transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3708N?
UC3708N orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3708N 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 UC3708N?
For technical support, including UC3708N datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3708N requirements.
6.How does Aetrix verify that UC3708N is sourced from the original manufacturer or authorized distributors?
All UC3708N 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 UC3708N meets industry standards.
7.What is the process for return or replacement of UC3708N?
All UC3708N units undergo pre-shipment inspection (PSI). If there is an issue with UC3708N, 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 UC3708N part is unused and in its original packaging.
Return procedure for UC3708N:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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