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Texas Instruments DRV8421ADGQR
- Part No.:
- DRV8421ADGQR
- Manufacturer:
- Texas Instruments
- Category:
- Motor Drivers, Controllers
- Package:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
DRV8421ADGQR.pdf
- Description:
- 18V, 2A dual H-bridge motor driv
- Quantity:
- Payment:
- Shipping:
Inventory:2,416
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Product details
Overview
DRV8421ADGQR from Texas Instruments is a dual H-bridge stepper motor driver IC designed for bipolar stepper and dual brushed DC motor control in home appliance mechatronics. It operates from 4–18 V, delivers up to 2 A per H-bridge (4 A in parallel mode), features 900 mΩ typical total RDS(ON), and integrates UVLO, OCP, and thermal shutdown protection. It is used in printer paper feed mechanisms requiring precise open-loop microstepping.
For engineers reviewing the DRV8421ADGQR datasheet, DRV8421ADGQR pinout, DRV8421ADGQR application, or DRV8421ADGQR equivalent, this page provides verified functional identity, HVSSOP-10 package mapping, confirmed 4-wire input architecture, validated thermal and current specifications, and two rigorously cross-checked alternative parts for stepper motor drive systems.
Technical Context
The DRV8421ADGQR implements two independent NMOS H-bridges with integrated gate drivers and analog overcurrent limiting per bridge. Its 4-wire input logic enables full half-bridge control-IN1/IN2 govern OUT1/OUT2, IN3/IN4 govern OUT3/OUT4-with truth-table-defined forward/reverse/brake/standby states. No internal current regulation or sense resistor interface is present.
It lacks nFAULT and EN pins-exclusive to the 2-wire DRV8421B variant-and therefore provides no fault reporting or sleep mode. Protection relies solely on VM undervoltage lockout (2.9 V fall / 3.0 V rise), cycle-by-cycle OCP (2 A trip), and thermal shutdown (150–180 °C with 35 °C hysteresis).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 4 V to 18 V - supports 12 V nominal appliance rails and tolerates brownout down to 4 V without latch-up |
| Max Output Current (per H-bridge) | 2 A at 12 V, TA = 25 °C - defines continuous winding current capability before thermal derating |
| Total RDS(ON) | 900 mΩ typical (HS + LS) at 12 V, 25 °C - determines I²R conduction loss and junction temperature rise under load |
| Operating Ambient Temperature | –40 °C to +85 °C - specifies usable range for embedded appliance control boards without forced cooling |
| Thermal Resistance (RθJA) | 62.5 °C/W (HVSSOP-10) - quantifies junction-to-ambient rise per watt; requires ≥250 mm² copper pour for 2 A sustained operation |
| Input Logic Thresholds | VIL ≤ 0.7 V, VIH ≥ 1.6 V - compatible with 3.3 V and 5 V microcontroller GPIO without level shifting |
| Propagation Delay | 400 ns max - ensures tight timing alignment between PWM input edges and output switching transitions |
Pinout & Package
HVSSOP-10 (DGQ) thermally enhanced surface-mount package: 3.00 mm × 3.00 mm body, 0.5 mm pitch, exposed thermal pad (PPAD) on underside for PCB heat sinking.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VM (Pin 1) | Motor power supply input | Bypassed with 0.1 µF + 10 µF ceramics; supplies both H-bridges; voltage directly sets output drive strength and thermal limits |
| IN1 (Pin 2) | H-bridge 1 high-side control input | Directly drives OUT1; logic high enables high-side FET when paired with IN2 low (forward) or high (brake) |
| IN2 (Pin 3) | H-bridge 1 low-side control input | Directly drives OUT2; complements IN1 to define H-bridge state; internal 200 kΩ pulldown holds OFF during reset |
| IN3 (Pin 4) | H-bridge 2 high-side control input | Directly drives OUT3; independent of IN1/IN2; enables dual-motor or stepper phase control |
| IN4 (Pin 5) | H-bridge 2 low-side control input | Directly drives OUT4; complements IN3; internal 170 kΩ pulldown ensures safe default state |
| GND (Pin 6) | Power ground reference | Return path for motor current and logic; must connect to low-impedance system ground plane beneath PPAD |
| OUT4 (Pin 7) | H-bridge 2 low-side output | Switches motor winding end to GND; rated for 2 A peak; internal pulldown prevents floating during disable |
| OUT3 (Pin 8) | H-bridge 2 high-side output | Switches motor winding end to VM; forms full bridge with OUT4; shares same RDS(ON) and thermal limits as OUT1/OUT2 |
| OUT2 (Pin 9) | H-bridge 1 low-side output | Switches motor winding end to GND; matched timing and drive strength to OUT1; critical for bidirectional torque symmetry |
| OUT1 (Pin 10) | H-bridge 1 high-side output | Switches motor winding end to VM; forms full bridge with OUT2; output rise/fall times ≤60 ns support 250 kHz PWM |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent H-bridge topology | Enables simultaneous control of two brushed DC motors or one bipolar stepper motor without shared timing constraints |
| 4-wire digital input interface | Supports discrete forward/reverse/brake/standby states per bridge via simple GPIO-no SPI/I²C or current-sense feedback required |
| Parallel mode capability | IN1–IN3 and IN2–IN4 tied together allows 4 A drive to single motor; OUT1–OUT3 and OUT2–OUT4 wired in parallel |
| Integrated protection suite | UVLO prevents operation below 2.9 V; OCP disables bridge on >2 A sustained current; TSD shuts down at 150–180 °C die temp |
| Thermally optimized HVSSOP-10 | RθJA = 62.5 °C/W enables 2 A operation with minimal PCB copper; exposed PPAD improves heat transfer to board |
Applications
| Printer Paper Feed Mechanism | Refrigerator Ice Dispenser Actuator |
|---|---|
|
Use Scenario: Bidirectional paper transport using a 2-phase bipolar stepper motor with 1.8° step angle. IC Role / Device Role / Timing Role: Dual H-bridge driver executing full-step and half-step commutation sequences via discrete IN1–IN4 signals from MCU. Use Value: 2 A per phase supports rapid acceleration of high-inertia paper stack; 900 mΩ RDS(ON) limits self-heating during continuous 100 ms pulse trains. |
Use Scenario: Precision dispensing of ice cubes via stepper-driven auger in freezer compartment (-20 °C ambient). IC Role / Device Role / Timing Role: Motor driver operating within –40 °C to +85 °C ambient range; withstands condensation-induced thermal cycling. Use Value: Wide 4–18 V supply range accommodates battery-backed 12 V rail during main power interruption; UVLO prevents erratic motion during brownout. |
| Vacuum Cleaner Brush Roll Drive | Clothes Dryer Drum Reversal Control |
|
Use Scenario: High-torque brushed DC motor driving rotating brush roll, requiring direction reversal every 5 seconds. IC Role / Device Role / Timing Role: Dual H-bridge configured for single motor bidirectional control (OUT1/OUT2 active, OUT3/OUT4 unused). Use Value: 2 A continuous rating sustains 15 W mechanical output at 12 V; thermal shutdown protects against lint-clogged airflow failure modes. |
Use Scenario: Intermittent reversal of dryer drum motor to prevent fabric tangling during tumbling cycles. IC Role / Device Role / Timing Role: Stepper-compatible driver used in open-loop position control for drum orientation sequencing. Use Value: Independent half-bridge control allows asymmetric timing (e.g., longer reverse dwell) without firmware complexity; 4-wire interface simplifies MCU GPIO allocation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual H-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| DRV8421BDGQR | 2-wire input (EN/IN1/IN2), includes nFAULT pin and 3 µA sleep mode; identical RDS(ON), OCP, and thermal specs | Required where fault reporting or low-power standby is needed; not pin-compatible due to EN/nFAULT replacing IN3/IN4 | Select DRV8421BDGQR if system-level fault diagnostics or energy-efficient idle states are mandatory |
| DRV8848RTVR | HTSSOP-16, adds external current-sense resistor interface and programmable OCP; RDS(ON) = 900 mΩ, 2 A rating, same 4–18 V range | Suitable for closed-loop current-controlled stepper applications; larger footprint and extra passive components required | Choose DRV8848RTVR only when precise winding current regulation or adjustable trip thresholds are required |
Compared with DRV8421BDGQR, the DRV8421ADGQR offers simpler GPIO control but no fault visibility; versus DRV8848RTVR, it eliminates current-sense circuitry and layout overhead at the cost of fixed OCP and no regulation-making it optimal for cost-sensitive, open-loop stepper systems.
Availability
DRV8421ADGQR is available at Aetrix Electronics and suitable for printer paper feed mechanisms, refrigerator ice dispensers, vacuum cleaner brush rolls, and clothes dryer drum reversal systems requiring stable component supply across multi-year appliance production cycles.
Supply support for DRV8421ADGQR 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 specializing in analog and embedded processing technologies, with leadership in motor control ICs for industrial and consumer applications.
The DRV8421 product line delivers cost-optimized, thermally robust dual H-bridge drivers for home appliance mechatronics-designed specifically for open-loop stepper and brushed DC motor control without current sensing or complex interfaces.
FAQ
What is the maximum continuous output current per H-bridge for the DRV8421ADGQR?
The DRV8421ADGQR supports up to 2 A continuous output current per H-bridge at 12 V supply and 25 °C ambient temperature. This rating assumes adequate PCB copper area (≥250 mm² thermal pad connection) and airflow. At higher temperatures or lower supply voltages, current must be derated per the RDS(ON) vs. temperature curve and thermal resistance (RθJA = 62.5 °C/W).
Does the DRV8421ADGQR support microstepping or require external current control?
No, the DRV8421ADGQR does not support microstepping or internal current regulation. It is a fixed-current, voltage-mode dual H-bridge driver with discrete IN1–IN4 logic inputs. Microstepping requires external indexer or MCU-based PWM timing; current control demands external chopper circuits or sense resistors-neither is integrated into the DRV8421ADGQR.
Is the DRV8421ADGQR pin-compatible with the DRV8421BDGQR?
No, the DRV8421ADGQR is not pin-compatible with the DRV8421BDGQR. The DRV8421ADGQR uses pins 4 and 5 for IN3 and IN4, while the DRV8421BDGQR repurposes those positions for EN and nFAULT. Swapping them requires PCB redesign-no shared pinout exists between the 4-wire and 2-wire variants.
What protection features are implemented in the DRV8421ADGQR?
The DRV8421ADGQR integrates VM undervoltage lockout (UVLO, 2.9 V fall / 3.0 V rise), cycle-by-cycle overcurrent protection (OCP, 2 A trip), and thermal shutdown (TSD, 150–180 °C with 35 °C hysteresis). It does not include fault reporting (nFAULT), sleep mode, or external current-sense interfaces-those are exclusive to the DRV8421B variant.
Can the DRV8421ADGQR drive a single motor at 4 A using parallel mode?
Yes, the DRV8421ADGQR supports parallel mode: tie IN1 to IN3 and IN2 to IN4, then connect OUT1 to OUT3 and OUT2 to OUT4. This configures both H-bridges to drive one motor winding, delivering up to 4 A at 12 V and 25 °C with proper heatsinking. The truth table for parallel operation is defined in Table 7-3 of the datasheet.
DRV8421ADGQR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 10-PowerTFSOP, 10-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- PWM
- Technology:
- Power MOSFET
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- 2A
- Voltage - Supply:
- 4V ~ 18V
- Voltage - Load:
- 4V ~ 18V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 10-HVSSOP
DRV8421ADGQR FAQ
1.How can I place an order for DRV8421ADGQR through Aetrix?
Please submit a Request for Quotation (RFQ) for DRV8421ADGQR 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 DRV8421ADGQR reliable?
The price and inventory of DRV8421ADGQR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for DRV8421ADGQR is usually 5 days.
3.What payment methods are accepted for DRV8421ADGQR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for DRV8421ADGQR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for DRV8421ADGQR?
DRV8421ADGQR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your DRV8421ADGQR 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 DRV8421ADGQR?
For technical support, including DRV8421ADGQR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your DRV8421ADGQR requirements.
6.How does Aetrix verify that DRV8421ADGQR is sourced from the original manufacturer or authorized distributors?
All DRV8421ADGQR 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 DRV8421ADGQR meets industry standards.
7.What is the process for return or replacement of DRV8421ADGQR?
All DRV8421ADGQR units undergo pre-shipment inspection (PSI). If there is an issue with DRV8421ADGQR, 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 DRV8421ADGQR part is unused and in its original packaging.
Return procedure for DRV8421ADGQR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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