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Allegro MicroSystems UDN2916LBTR-T
- Part No.:
- UDN2916LBTR-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UDN2916LBTR-T.pdf
- Description:
- IC MOTOR DRIVER BIPOLAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,877
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Product details
Overview
UDN2916LBTR-T from Allegro MicroSystems is a dual full-bridge PWM motor driver IC designed to control both windings of bipolar stepper motors or bidirectionally drive two DC motors. It sustains 45 V motor supply voltage, delivers 750 mA continuous output current per bridge, and features internal PWM current control with selectable 0%/33%/67%/100% current limits via logic inputs I₀/I₁ - used in industrial motion control, printer mechanisms, and automated valve actuation.
For engineers reviewing the UDN2916LBTR-T datasheet, UDN2916LBTR-T pinout, UDN2916LBTR-T application, or UDN2916LBTR-T equivalent, key selection considerations include its 24-pin batwing SOICW (LB) package thermal performance (θJA = 55°C/W), integrated clamp/flyback diodes, fixed off-time PWM architecture (typ. 46 μs), and compatibility with microprocessor-controlled half-step sequencing.
Technical Context
The UDN2916LBTR-T implements two independent H-bridge outputs with source/sink drivers optimized for low saturation voltage (≤1.5 V total at 750 mA). Each bridge includes dedicated PHASE, PWM, I₀, and I₁ inputs, enabling digital current scaling and direction control without external logic.
Its internal PWM current regulation uses an external RC network (RT/CT) to set fixed off-time (46 μs typ.), while current sensing occurs across external resistors (RS) referenced to VREF (1.5–7.5 V range); trip threshold follows ITRIP = VREF / (10 × RS) for full-scale operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 750 mA continuous per bridge - supports sustained bipolar stepper winding drive without external heatsinking under typical ambient conditions. |
| Motor Supply Voltage | 45 V max - enables direct interface with 24 V and 36 V industrial motor rails, including solenoid and actuator loads. |
| Output Saturation Voltage | ≤1.5 V total (source + sink) at 750 mA - reduces conduction loss and thermal load during high-current operation. |
| PWM Fixed Off-Time | 46 μs typical (RT = 56 kΩ, CT = 820 pF) - ensures current chopping above audible range while balancing ripple and regulation stability. |
| Thermal Shutdown Threshold | 170°C junction temperature - protects against latch-up or permanent damage during overload or poor PCB thermal design. |
| Logic Supply Range | VCC = 4.75–5.25 V - compatible with standard 5 V microcontroller I/O without level shifting. |
| Operating Ambient Range | –20°C to +85°C (N grade) - validated for commercial and light-industrial environments with no derating required. |
Pinout & Package
The UDN2916LBTR-T is supplied in a 24-pin surface-mount wide SOIC (SOICW) package with batwing leads (Pins 6, 7, 18, 19 fused internally) for enhanced thermal dissipation (θJA = 55°C/W on single-layer board).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 8, 9, 10, 11, 12, 13, 16, 17, 20, 21, 22, 23, 24 | Ground / Logic Input / Output Control | Pins 1–5, 8–13, 16–17, 20–24 serve as GND, PHASE, PWM, I₀/I₁, VREF, VCC, SENSE, and OUT terminals - require strict separation of power/ground return paths to avoid sensing error. |
| 6, 7, 18, 19 | Thermal Batwing Terminals | Fused internal connections to die substrate - must be soldered to ≥6 cm² copper pour for rated 750 mA continuous operation. |
| 14, 15 | Bridge 1 Outputs (OUT1A, OUT1B) | High-side source and low-side sink outputs for first motor winding - support bidirectional current flow controlled by PHASE1 and PWM1. |
| 20, 21 | Bridge 2 Outputs (OUT2A, OUT2B) | Independent H-bridge outputs for second winding or DC motor - electrically isolated from Bridge 1 except shared VBB and GND. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated Clamp Diodes | Eliminates need for external flyback diodes across motor windings - reduces BOM count and layout area while ensuring safe inductive energy recirculation. |
| Digital Current Scaling | I₀/I₁ logic inputs select four discrete current levels (0%, 33%, 67%, 100%) - enables microprocessor-driven torque management during hold/start/half-step transitions. |
| Internal Thermal Shutdown | Automatic disable at 170°C junction temperature with auto-recovery at 145°C - prevents catastrophic failure without external monitoring circuitry. |
| Low-Voltage Sense Interface | SENSE pins accept ≤1.5 V differential input - allows use of low-value, low-power sense resistors (e.g., 0.5 Ω @ 750 mA = 0.375 V) minimizing heat generation. |
| No Power-Up Sequencing Required | Operates safely with VBB and VCC applied simultaneously - simplifies power supply design and eliminates startup timing constraints. |
Applications
| Printer Paper Feed Mechanism | Industrial Valve Positioner |
|---|---|
|
Use Scenario: Precise bidirectional stepping of paper transport rollers in laser and inkjet printers. IC Role / Device Role / Timing Role: Dual full-bridge driver controlling two-phase stepper motor with microprocessor-directed half-step sequencing. Use Value: Enables consistent paper advance/reverse with 0%/67%/100% current switching to reduce power consumption during hold and increase torque during acceleration. |
Use Scenario: Closed-loop positioning of pneumatic or electric actuators in process control valves. IC Role / Device Role / Timing Role: Bidirectional DC motor driver delivering regulated 750 mA to position feedback-coupled actuators. Use Value: Internal PWM current control maintains precise force output across varying load friction, while 45 V rating accommodates 24 V industrial supply rails. |
| Bipolar Stepper Motor Controller | Automated Test Equipment (ATE) Stage |
|
Use Scenario: Driving NEMA 17–23 size bipolar stepper motors in CNC accessories and lab automation stages. IC Role / Device Role / Timing Role: Dual H-bridge providing independent phase current regulation and direction control per winding. Use Value: Fixed off-time PWM (46 μs) ensures quiet operation above 20 kHz while sustaining 750 mA peak current for high-holding-torque positioning. |
Use Scenario: Precision XY motion control of probe cards and wafer handlers in semiconductor ATE systems. IC Role / Device Role / Timing Role: Dual-bridge motor driver interfacing with FPGA-based motion controllers for synchronized multi-axis movement. Use Value: Batwing SOICW package (LB) provides reliable thermal performance on dense ATE PCBs without requiring additional heatsinks or airflow. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual full-bridge motor driver applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| A4970KLPTR-T | Higher 1.5 A continuous current rating, integrated current-sense amplifier, SPI interface for diagnostics. | Supports closed-loop current monitoring and fault reporting - suited for safety-critical or predictive maintenance systems. | Preferred for new designs requiring higher current headroom and digital bus integration; not pin-compatible with UDN2916LBTR-T. |
| UC3770DW | Legacy dual full-bridge driver with 1.2 A peak current, no internal PWM - requires external oscillator and comparator. | Lacks integrated current regulation; demands more external components and layout space. | Only suitable for legacy repair or drop-in replacement where existing UC3770 footprint and bill-of-materials are preserved. |
Compared with UDN2916LBTR-T, the A4970KLPTR-T offers higher current capability and digital diagnostics but requires PCB redesign, while the UC3770DW matches legacy mechanical fit but increases system complexity and lacks internal PWM control - making UDN2916LBTR-T a balanced choice for cost-sensitive, thermally constrained stepper applications.
Availability
UDN2916LBTR-T is available at Aetrix Electronics and suitable for industrial motion control, printer mechanisms, and automated valve actuation requiring stable component supply despite its Pre-End of Life status.
Supply support for UDN2916LBTR-T 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
Allegro MicroSystems is a U.S.-based designer and manufacturer of high-performance magnetic sensors and power ICs, specializing in motion control and energy-efficient power solutions.
The UDN2916LBTR-T belongs to Allegro's legacy dual full-bridge motor driver product line, engineered specifically for cost-effective, thermally robust bipolar stepper and dual DC motor control in commercial and light-industrial equipment.
FAQ
What is the maximum continuous output current per bridge for UDN2916LBTR-T?
The UDN2916LBTR-T supports 750 mA continuous output current per bridge under specified thermal conditions (TA ≤ 85°C, θJA = 55°C/W on single-layer board). This rating assumes proper PCB copper area on batwing pins (6–18 cm²) and avoids exceeding TJ(max) = 150°C. Peak current capability reaches 1.0 A, but only for short duty cycles with adequate cooling.
Does UDN2916LBTR-T require external flyback diodes for inductive load protection?
No, the UDN2916LBTR-T integrates ground-clamp and flyback diodes within each H-bridge, eliminating the need for external diodes across motor windings. These internal diodes handle inductive transient energy during current decay, reducing component count and layout complexity - confirmed in the device description and electrical characteristics table.
What is the function of the I₀ and I₁ inputs on UDN2916LBTR-T?
The I₀ and I₁ logic-level inputs on UDN2916LBTR-T digitally select four discrete output current limits: 0%, 33%, 67%, or 100% of the maximum set by VREF and RS. When both are high (≥2.4 V), all drivers disable - serving as an output enable/disable function. This feature enables microprocessor-controlled torque scaling during hold, start-up, and half-step sequencing.
Is UDN2916LBTR-T pin-compatible with UDN2916B-T1 or UDN2916EBTR-T1?
No, UDN2916LBTR-T is not pin-compatible with UDN2916B-T1 (24-pin DIP) or UDN2916EBTR-T1 (44-pin PLCC). While all share identical functional pin assignments, their physical layouts differ: LB uses 24-pin SOICW with batwings at Pins 6/7/18/19; B uses through-hole DIP; EB uses 44-pin PLCC. PCB layout and footprint must be redesigned for each package variant.
What is the recommended value for the sense resistor RS when using UDN2916LBTR-T at 750 mA full scale?
For 750 mA full-scale operation with VREF = 5.0 V, the recommended sense resistor value is RS ≈ 0.67 Ω, calculated from ITRIP = VREF / (10 × RS). Allegro specifies RS = 0.75 / ITRIP(max) ± 50%, so 0.67 Ω falls within the valid range (0.34–1.0 Ω). This ensures SENSE terminal voltage stays below the 1.5 V absolute maximum while maintaining accurate current regulation.
UDN2916LBTR-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Motor Type - Stepper:
- Bipolar
- Motor Type - AC, DC:
- Brushed DC
- Function:
- Driver - Fully Integrated, Control and Power Stage
- Output Configuration:
- Half Bridge (4)
- Interface:
- Parallel
- Technology:
- Bipolar
- Step Resolution:
- -
- Applications:
- General Purpose
- Current - Output:
- 750mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Voltage - Load:
- 10V ~ 45V
- Operating Temperature:
- -20°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 24-SOIC
UDN2916LBTR-T FAQ
1.How can I place an order for UDN2916LBTR-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2916LBTR-T 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 UDN2916LBTR-T reliable?
The price and inventory of UDN2916LBTR-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2916LBTR-T is usually 5 days.
3.What payment methods are accepted for UDN2916LBTR-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2916LBTR-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2916LBTR-T?
UDN2916LBTR-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2916LBTR-T 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 UDN2916LBTR-T?
For technical support, including UDN2916LBTR-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2916LBTR-T requirements.
6.How does Aetrix verify that UDN2916LBTR-T is sourced from the original manufacturer or authorized distributors?
All UDN2916LBTR-T 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 UDN2916LBTR-T meets industry standards.
7.What is the process for return or replacement of UDN2916LBTR-T?
All UDN2916LBTR-T units undergo pre-shipment inspection (PSI). If there is an issue with UDN2916LBTR-T, 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 UDN2916LBTR-T part is unused and in its original packaging.
Return procedure for UDN2916LBTR-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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