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Allegro MicroSystems UDN2916EB
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- Part No.:
- UDN2916EB
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
UDN2916EB.pdf
- Description:
- IC MOTOR DRIVER BIPOLAR 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,807
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Product details
Overview
UDN2916EB from Allegro MicroSystems is a discontinued dual full-bridge PWM motor driver IC designed for bipolar stepper motor control and bidirectional DC motor driving. It delivers 750 mA continuous output current per bridge, sustains 45 V motor supply voltage, features internal PWM current regulation with selectable 0%/33%/67%/100% current limits, and integrates clamp/flyback diodes and thermal shutdown. It was used in industrial motion control systems requiring precise winding current control.
For engineers reviewing the UDN2916EB datasheet, UDN2916EB pinout, UDN2916EB application, or UDN2916EB equivalent, key selection considerations include its 44-pin PLCC (EB) package with internally fused batwing leads, fixed off-time PWM architecture, PHASE/I0/I1 logic interface, and discontinuation status requiring legacy design support or migration planning.
Technical Context
The UDN2916EB implements two independent H-bridge outputs with integrated source/sink drivers, each controlled by separate PHASE, PWM, and current-select (I0/I1) inputs. Its internal monostable-based PWM circuit uses external RC timing components (RT/CT) to set fixed off-time, enabling current chopping above audible frequencies (e.g., 46 μs typical).
Current regulation relies on external sense resistors (RS) and a user-configurable reference voltage (VREF), with trip thresholds calculated as ITRIP = VREF/(10·RS), VREF/(15·RS), or VREF/(30·RS) depending on I0/I1 logic states. Thermal protection activates at TJ = 170°C and recovers at 145°C, while output saturation voltage remains ≤1.5 V total (source + sink) at 750 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 750 mA continuous per bridge - enables driving of medium-torque bipolar stepper motors without external current amplification |
| Motor Supply Voltage | 45 V max - supports 24 V and 36 V industrial motor rails with margin for inductive kick |
| PWM Fixed Off-Time | 46 μs typical (RT = 56 kΩ, CT = 820 pF) - ensures current regulation above audible range and reduces EMI |
| Output Saturation Voltage | ≤1.5 V total (source + sink) at 750 mA - minimizes power loss and thermal stress during continuous conduction |
| Junction Temp Limit | 170°C shutdown / 145°C recovery - provides fail-safe thermal protection without latch-up |
| Logic Interface | I0/I1 select 0%/33%/67%/100% current limit; PHASE sets direction - enables microprocessor-controlled half-step and torque-matching sequences |
| Package Thermal Resistance | θJA = 30°C/W (EB package) - achieved via 11 internally fused batwing leads for enhanced PCB copper heat spreading |
Pinout & Package
The UDN2916EB is supplied in a 44-pin power PLCC (EB package) with internally fused leads on two sides (pins 7–17 and 29–39), optimized for high-power dissipation via webbed batwing construction and direct PCB copper thermal coupling.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 44, 43 | Ground | Dedicated low-impedance ground returns for logic, sense, and power domains to minimize IR drop errors in current sensing |
| 3, 4, 5, 6 | PWM 1 / PHASE 1 / I01 / I11 | Bridge 1 control inputs - digital logic-level signals defining current magnitude and winding polarity |
| 7–17 | Fused Batwing Leads (Power Ground) | Internally fused thermal paths connected to die substrate - require direct PCB copper pour for effective heat removal |
| 18–20 | VREF 1 / RC1 / SENSE 1 | Bridge 1 current regulation interface - VREF sets trip threshold; RC sets monostable timing; SENSE connects to RS |
| 21–24 | OUT 1A / E1 / OUT 1B / VCC | Bridge 1 output terminals and logic supply - E1 is emitter return; VCC powers internal logic (4.75–5.25 V) |
| 25–28 | LOAD SUPPLY (VBB) / GND / GND / GND | High-current motor supply input and redundant ground pins - minimize voltage drop under 750 mA load |
| 29–39 | Fused Batwing Leads (Power Ground) | Second set of thermally optimized ground paths for Bridge 2 - symmetric layout improves thermal balance |
| 40–42 | OUT 2B / I12 / I02 | Bridge 2 output and current-select inputs - identical function to Bridge 1 but electrically isolated |
Key Features
| Feature | Design Value |
|---|---|
| Internal PWM current control | Eliminates need for external chopper IC or microcontroller PWM generation - simplifies stepper drive firmware and reduces BOM count |
| Dual independent H-bridges | Enables simultaneous control of both windings in a bipolar stepper motor without external phase sequencing logic |
| Programmable current limit (4 levels) | Allows dynamic torque adjustment during operation - e.g., 100% for start-up, 67% for holding two phases energized in half-step mode |
| Integrated clamp and flyback diodes | Prevents destructive voltage spikes during inductive load switching - removes requirement for 4 external fast-recovery diodes per bridge |
| Thermal shutdown with hysteresis | Provides autonomous overtemperature protection with 25°C hysteresis (170°C trip / 145°C reset) - avoids system-level thermal monitoring overhead |
Applications
| Industrial Stepper Positioning | Print Head Actuation |
|---|---|
Use Scenario: Precision open-loop positioning of X-Y stages in CNC milling accessories and automated test equipment. IC Role / Device Role / Timing Role: Dual full-bridge driver executing microprocessor-generated step/direction sequences with real-time current scaling per winding. Use Value: Maintains consistent torque across full 200-step/rev resolution using I0/I1 logic to match 100% single-phase and 67% dual-phase current levels. |
Use Scenario: Bidirectional movement of inkjet print heads across carriage rails with rapid acceleration/deceleration. IC Role / Device Role / Timing Role: PWM-controlled H-bridge delivering regulated 750 mA to low-inductance DC voice-coil actuators. Use Value: Fixed off-time PWM (46 μs) ensures smooth motion without audible noise while sustaining 45 V rail for fast settling. |
| Medical Pump Drive | Lab Automation Valve Control |
Use Scenario: Peristaltic fluid pumping in diagnostic analyzers requiring accurate flow rate control via stepper motor speed and torque modulation. IC Role / Device Role / Timing Role: Bipolar stepper driver with VREF-adjustable peak current and thermal fault reporting to host controller. Use Value: Internal thermal shutdown prevents pump stall-induced overheating, and low 1.5 V saturation voltage minimizes power loss in sealed enclosures. |
Use Scenario: Sequenced actuation of solenoid valves and rotary positioners in multi-channel liquid handling robots. IC Role / Device Role / Timing Role: Dual DC motor driver enabling independent forward/reverse control of two valve actuators from shared logic supply. Use Value: Integrated clamp diodes suppress inductive kick from 24 V solenoids, eliminating need for discrete TVS or diode arrays per channel. |
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 | Successor device with integrated current-sense amplifier, higher 1 A continuous current, and improved thermal resistance (θJA = 25°C/W); requires different RC timing and lacks I0/I1 logic interface. | Designed for new designs requiring higher current and analog current feedback; not pin-compatible with UDN2916EB. | Select A4970 when upgrading legacy UDN2916EB designs to support >750 mA loads or closed-loop current monitoring. |
| UC3770DW | Legacy dual full-bridge driver with 1.2 A peak current, no internal PWM, requires external oscillator and comparator; similar 24-pin SOIC package but incompatible pinout. | Used in older industrial drives where external PWM generation is acceptable; lacks thermal shutdown and integrated diodes. | Consider UC3770 only for repair of obsolete systems where UDN2916EB is unavailable and external PWM circuitry already exists. |
Compared with UDN2916EB, the A4970 offers higher current capability and integrated diagnostics but demands board redesign, while the UC3770 retains legacy compatibility at the cost of increased component count and reduced protection features.
Availability
UDN2916EB is available at Aetrix Electronics and suitable for industrial motion control, medical pump actuation, and lab automation applications requiring stable component supply for legacy system maintenance and long-life production support.
Supply support for UDN2916EB 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 Hall-effect sensors, motor driver ICs, and power ICs for automotive and industrial applications.
The UDN2916EB belongs to Allegro's legacy dual full-bridge motor driver product line, engineered specifically for cost-sensitive, thermally demanding bipolar stepper and dual DC motor control in factory automation and instrumentation.
FAQ
Is UDN2916EB still in production?
No, the UDN2916EB is a discontinued product. Allegro MicroSystems officially ended production on January 30, 2012. It is no longer manufactured, and samples are unavailable. Aetrix Electronics maintains limited legacy stock for ongoing maintenance and repair of installed systems, but new design-in is strongly discouraged.
What is the package type and thermal performance of UDN2916EB?
The UDN2916EB uses a 44-pin power PLCC (EB package) with 11 internally fused batwing leads on each side (pins 7–17 and 29–39). Its thermal resistance is θJA = 30°C/W when mounted on a standard PCB with copper pour, significantly better than the DIP (B) or SOICW (LB) variants due to enhanced heat spreading through fused leads.
How does current limiting work on UDN2916EB?
UDN2916EB uses external sense resistors (RS) and a user-set reference voltage (VREF) to define peak current via ITRIP = VREF/(10·RS), VREF/(15·RS), or VREF/(30·RS), selected by logic inputs I0 and I1. The internal monostable turns off the source driver when VSENSE reaches the threshold, creating fixed off-time PWM current regulation without requiring microcontroller intervention.
Can UDN2916EB drive a 45 V stepper motor?
Yes, the UDN2916EB supports motor supply voltages up to 45 V (VBB), making it suitable for 36 V nominal stepper motors with headroom for back-EMF and inductive transients. However, continuous operation at 45 V requires strict thermal management - junction temperature must remain below 150°C, and the EB package's θJA = 30°C/W must be leveraged with adequate PCB copper area.
What is the recommended replacement for UDN2916EB in new designs?
The officially recommended replacement is the A4970KLPTR-T, which Allegro designated as the successor. It offers 1 A continuous current, integrated current-sense amplifier, improved thermal performance (θJA = 25°C/W), and enhanced protection features. However, it is not pin-compatible with UDN2916EB and requires schematic and layout changes, including updated RC timing and removal of I0/I1 logic interface.
UDN2916EB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 44-LCC (J-Lead)
- Packaging:
- Tube
- 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:
- 44-PLCC (16.59x16.59)
UDN2916EB FAQ
1.How can I place an order for UDN2916EB through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2916EB 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 UDN2916EB reliable?
The price and inventory of UDN2916EB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2916EB is usually 5 days.
3.What payment methods are accepted for UDN2916EB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2916EB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2916EB?
UDN2916EB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2916EB 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 UDN2916EB?
For technical support, including UDN2916EB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2916EB requirements.
6.How does Aetrix verify that UDN2916EB is sourced from the original manufacturer or authorized distributors?
All UDN2916EB 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 UDN2916EB meets industry standards.
7.What is the process for return or replacement of UDN2916EB?
All UDN2916EB units undergo pre-shipment inspection (PSI). If there is an issue with UDN2916EB, 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 UDN2916EB part is unused and in its original packaging.
Return procedure for UDN2916EB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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