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Texas Instruments UC3717ANG4
- Part No.:
- UC3717ANG4
- Manufacturer:
- Texas Instruments
- Category:
- Full Half-Bridge (H Bridge) Drivers
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
UC3717ANG4.pdf
- Description:
- IC HALF BRIDGE DRIVER 1A 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,752
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Product details
Overview
UC3717ANG4 from Texas Instruments is a bipolar stepper motor driver IC with H-bridge output stage, supporting full-step, half-step, and micro-step operation. It delivers ±1.2A peak output current per winding, operates from 10V to 46V motor supply (Vm), features integrated bootstrap circuitry for reduced recirculation saturation voltage (1.1–1.35V at –0.5A), and includes thermal shutdown at +160°C to +180°C. It is used in precision motion control systems such as CNC positioning stages and automated lab equipment.
For engineers reviewing the UC3717ANG4 datasheet, UC3717ANG4 pinout, UC3717ANG4 application, or UC3717ANG4 equivalent, key selection criteria include its fixed off-time current regulation architecture, dual-bit D/A selectable current thresholds (100%/60%/19%/inhibit), LS-TTL-compatible logic inputs, and PDIP-16 package suitability for prototyping and industrial motor drive modules.
Technical Context
The UC3717ANG4 implements a chopper-driven, fixed off-time current control algorithm using an internal monostable, two-bit D/A threshold selector, and analog current sense comparator network. Its H-bridge output stage integrates Darlington transistors with built-in fast-recovery commutating diodes and bootstrap pull-up for improved efficiency during recirculation.
Phase polarity logic provides noise-immune bidirectional winding current control with hysteresis, while thermal protection actively reduces winding current before junction temperature exceeds +180°C. The device requires external RC timing components (RT/CT) to set off-time (e.g., 25–35 µs with RT = 56 kΩ, CT = 820 pF) and supports microstepping via analog VR reference input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | ±1.2A peak per winding - enables driving NEMA 17–23 bipolar stepper motors with torque up to ~1.5 N·m |
| Motor Supply Voltage (Vm) | 10 V to 46 V - supports wide-range DC bus operation including 24 V and 48 V industrial systems |
| Logic Supply (VCC) | 4.75 V to 5.25 V - compatible with standard 5 V TTL/LS logic without level shifting |
| Current Threshold Options | 100%, 60%, 19%, or inhibit - selected via IO/I1 pins for discrete step resolution or dynamic current scaling |
| Saturation Voltage (Recirc) | 1.1–1.35 V at –0.5A - low-loss recirculation path enabled by integrated bootstrap, reducing power dissipation |
| Thermal Shutdown Threshold | +160°C to +180°C - soft intervention limits junction temperature without abrupt shutdown |
| Operating Temperature | 0°C to +70°C ambient - rated for commercial-grade embedded motion control environments |
Pinout & Package
The UC3717ANG4 is housed in a 16-pin plastic dual in-line package (PDIP-N), with exposed GND pins (4, 5, 12, 13, 14, 16) providing thermal conduction to PCB copper planes. Pin 1 and Pin 15 are high-current output terminals (AOUT/BOUT), and Pin 10 (I0) and Pin 11 (I1) configure current level selection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 15 | AOUT / BOUT | High-current H-bridge outputs - connect directly to motor winding terminals; support ±1.2A switching |
| 4, 17 | Vm | Motor supply input - accepts 10–46 V DC; decoupling capacitor required near pin |
| 5, 12, 13, 14, 16 | GND | Power and signal ground - multiple pins reduce IR drop and improve thermal dissipation |
| 6 | VCC | Logic supply input - powers internal logic, comparators, and monostable (4.75–5.25 V) |
| 7, 8, 9 | Logic Inputs | Phase, I0, I1 - LS-TTL compatible; define direction and current level (0.8 V low / 2 V high thresholds) |
| 10 | VR (Reference) | Analog current threshold adjust - enables microstepping by varying comparator reference voltage |
| 2 | Timing | RC timing node - sets fixed off-time (tOFF) via external RT/CT network (e.g., 56 kΩ / 820 pF) |
| 3, 11, 18, 19, 20 | N/C or Emitters | No-connect or internal emitter taps - not externally accessible; unused in PDIP-16 configuration |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Bootstrap Pull-Up | Reduces source transistor saturation voltage during recirculation by ~0.6 V, improving efficiency and lowering thermal load |
| Fixed Off-Time Current Regulation | Enables precise peak current control independent of motor inductance or supply variation, supporting stable microstepping |
| Built-In Fast Recovery Diodes | Eliminates need for external flyback diodes; reduces layout area and EMI from reverse recovery spikes |
| Two-Bit D/A Current Selection | Provides four discrete current levels (100%/60%/19%/inhibit) via simple logic inputs - simplifies firmware control |
| Thermal Protection with Soft Intervention | Gradually reduces winding current above +160°C instead of hard shutdown - avoids motor stall and position loss |
Applications
| Industrial CNC Positioning | Lab Automation Stage Control |
|---|---|
Use Scenario: Open-loop X-Y table in semiconductor wafer inspection system requiring repeatable 0.01 mm positioning. IC Role / Device Role / Timing Role: Bipolar stepper driver implementing fixed off-time chopper control to maintain constant winding current across variable step rates. Use Value: ±1.2A output and 10–46 V Vm range enable direct drive of high-torque hybrid steppers without external MOSFETs or gate drivers. | Use Scenario: Multi-axis pipetting robot in clinical diagnostics platform needing smooth half-stepping at 200 steps/sec. IC Role / Device Role / Timing Role: Dual-channel current controller (two UC3717ANG4 per axis) with VR-adjusted thresholds for microstep current balancing. Use Value: Integrated bootstrap and low recirculation VSAT (1.1 V) minimize heat buildup during sustained high-frequency stepping. |
| Automated Test Equipment (ATE) | Printed Circuit Board Assembly |
Use Scenario: Z-axis height adjustment in flying probe tester with rapid direction reversal and minimal settling time. IC Role / Device Role / Timing Role: Phase-polarity controlled H-bridge driver with hysteresis-protected inputs to reject noise from nearby relay switching. Use Value: Noise-immune phase logic and soft thermal intervention prevent missed steps during continuous bidirectional scanning. | Use Scenario: Pick-and-place machine feeder belt indexer using NEMA 23 stepper for precise part indexing under 48 V DC bus. IC Role / Device Role / Timing Role: High-voltage motor driver interfacing with 5 V microcontroller GPIOs via LS-TTL-compatible inputs. Use Value: 46 V Vm rating and 5 V logic compatibility eliminate level-shifting circuitry, reducing BOM count and board space. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar stepper motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TB6600HG | Higher peak current (4.5 A), external MOSFET-based, requires gate drive and current sense resistor | Targeted at high-power NEMA 34 motors; lacks integrated bootstrap and analog VR microstep tuning | Choose when >2 A winding current or programmable decay mode is required; adds design complexity |
| DRV8825 | Integrated current regulation, 2.2 A max, 3.3/5 V logic, microstepping up to 1/32, no thermal soft intervention | Designed for compact 3D printer axes; uses internal PWM rather than fixed off-time; smaller QFN package | Prefer for space-constrained designs needing fine microstepping; lacks UC3717ANG4's 46 V Vm headroom and robust thermal management |
Compared with TB6600HG and DRV8825, the UC3717ANG4 offers superior thermal resilience via soft-shutdown intervention, native 46 V operation without external HV FETs, and analog VR-based microstepping flexibility - making it optimal for industrial-grade open-loop motion where reliability and voltage margin outweigh ultra-fine step resolution.
Availability
UC3717ANG4 is available at Aetrix Electronics and suitable for industrial CNC positioning, lab automation stage control, automated test equipment (ATE), and printed circuit board assembly systems requiring stable component supply and long-term obsolescence management.
Supply support for UC3717ANG4 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 logic solutions for industrial, automotive, and communications markets.
The UC3717ANG4 belongs to TI's legacy motor driver product line, designed specifically for cost-sensitive, high-reliability bipolar stepper applications in commercial-temperature industrial equipment - emphasizing robustness, minimal external components, and field-proven thermal behavior.
FAQ
What is the maximum motor supply voltage supported by the UC3717ANG4?
The UC3717ANG4 supports a motor supply voltage (Vm) range of 10 V to 46 V, with absolute maximum rating at 50 V. This allows direct integration into 24 V and 48 V industrial power rails without intermediate regulation. Operation at 46 V ensures sufficient overdrive for rapid winding current slew rates while maintaining safe margin below the 50 V limit. The UC3717ANG4 maintains specified performance across this full range when used with appropriate heatsinking and decoupling.
Does the UC3717ANG4 require external flyback diodes?
No, the UC3717ANG4 does not require external flyback diodes. It integrates fast-recovery commutating diodes within its H-bridge output stage, explicitly designed to handle recirculating current during PWM off-time. These diodes are optimized for low forward voltage (1.1–1.5 V at 0.5 A) and fast reverse recovery, eliminating external components and reducing PCB footprint and EMI. This integration is confirmed in the functional description and electrical characteristics tables of the UC3717ANG4 datasheet.
How does the UC3717ANG4 implement microstepping?
The UC3717ANG4 supports microstepping through its analog VR (pin 10) input, which continuously adjusts the current threshold reference for the internal comparators. While discrete current levels (100%/60%/19%) are set via I0/I1 logic pins, applying a variable voltage (0–5 V) to VR modulates the effective threshold between those levels - enabling smooth current interpolation. This analog method, combined with fixed off-time chopper control, achieves true microstepping without requiring external DACs or complex sequencing logic. The UC3717ANG4 datasheet confirms VR's role in "allowing microstepping" in the functional description section.
What is the purpose of the bootstrap circuit in the UC3717ANG4?
The integrated bootstrap circuit in the UC3717ANG4 pulls up the base of the upper-source Darlington transistor during recirculation, reducing its saturation voltage by ~0.6 V (e.g., from 1.7 V to 1.1 V at –0.5 A). This lowers conduction losses and die temperature during high-duty-cycle operation. Unlike discrete bootstrap designs, this feature is fully internal and requires no external capacitors or charge pumps. The UC3717ANG4's improved efficiency and thermal performance over the UC3717 stem directly from this enhancement, as documented in the device description and output stage analysis.
Is the UC3717ANG4 pin-compatible with the UC3717AN?
Yes, the UC3717ANG4 is pin-compatible with the UC3717AN. Both are PDIP-16 packaged variants of the same silicon die, sharing identical pinout, electrical specifications, and functional block diagram. The "G4" suffix denotes a specific tape-and-reel packaging variant per TI's ordering nomenclature (tube vs. reel), not a functional revision. All timing, logic, power, and output pin assignments match exactly - allowing drop-in replacement in existing designs without PCB modification. This compatibility is verified in TI's official packaging addendum and device marking documentation.
UC3717ANG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Output Configuration:
- Half Bridge (2)
- Applications:
- General Purpose, Stepper Motors
- Interface:
- Logic
- Load Type:
- Inductive
- Technology:
- Bipolar
- Rds On (Typ):
- -
- Current - Output / Channel:
- 1A
- Current - Peak Output:
- -
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 46V
- Operating Temperature:
- 0°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Features:
- Bootstrap Circuit
- Fault Protection:
- Over Temperature
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-PDIP
UC3717ANG4 FAQ
1.How can I place an order for UC3717ANG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for UC3717ANG4 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 UC3717ANG4 reliable?
The price and inventory of UC3717ANG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UC3717ANG4 is usually 5 days.
3.What payment methods are accepted for UC3717ANG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UC3717ANG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UC3717ANG4?
UC3717ANG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UC3717ANG4 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 UC3717ANG4?
For technical support, including UC3717ANG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UC3717ANG4 requirements.
6.How does Aetrix verify that UC3717ANG4 is sourced from the original manufacturer or authorized distributors?
All UC3717ANG4 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 UC3717ANG4 meets industry standards.
7.What is the process for return or replacement of UC3717ANG4?
All UC3717ANG4 units undergo pre-shipment inspection (PSI). If there is an issue with UC3717ANG4, 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 UC3717ANG4 part is unused and in its original packaging.
Return procedure for UC3717ANG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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