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Allegro MicroSystems UDN2916EB-T
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- Part No.:
- UDN2916EB-T
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 44-LCC (J-Lead)
- Datasheet:
-
UDN2916EB-T.pdf
- Description:
- IC MOTOR DRIVER BIPOLAR 44PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,892
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Product details
Overview
UDN2916EB-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 integrates internal PWM current control with user-selectable 0%/33%/67%/100% current limits via logic inputs I₀/I₁ - used in industrial motion control systems requiring precise winding current regulation.
For engineers reviewing the UDN2916EB-T datasheet, UDN2916EB-T pinout, UDN2916EB-T application, or UDN2916EB-T equivalent, this page provides verified technical context, package-specific thermal performance data, confirmed pin functions for the 44-pin PLCC EB package, and validated alternatives for legacy design support and migration planning.
Technical Context
The UDN2916EB-T implements two independent H-bridge outputs with integrated source/sink drivers, ground-clamp and flyback diodes, and internal thermal shutdown at 170°C. Each bridge uses a monostable multivibrator-based fixed off-time PWM controller triggered by external sense resistor (RS) and reference voltage (VREF), enabling peak current regulation with typical 2 μs internal delay.
Logic-level PHASE inputs determine current direction per bridge; I₀/I₁ digital inputs select four discrete current thresholds (0–100% of VREF/10RS); RC timing components (RT/CT) set off-time (e.g., 46 μs typical with 56 kΩ/820 pF). No special power-up sequencing is required, and crossover current is prevented by internally generated ~2 μs dead time.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Sustaining Voltage | 45 V - supports industrial 24–42 V DC motor supplies without external clamping. |
| Continuous Output Current | 750 mA per bridge - enables direct driving of NEMA 17–23 stepper motors at full-step hold torque. |
| Output Saturation Voltage | <1.8 V total (source + sink) at 500 mA - reduces conduction loss and thermal load during sustained operation. |
| PWM Current Control | User-configurable via VREF and RS - sets trip point ITRIP = VREF/10RS, enabling microstepping and torque-matched half-step sequences. |
| Thermal Shutdown Threshold | 170°C junction temperature - protects against latch-up during overload or inadequate heatsinking; auto-recovery at 145°C. |
| Logic Supply Range | 4.75–5.25 V - compatible with standard 5 V microcontroller I/O without level-shifting. |
| Ambient Temperature Range | –20°C to +85°C - qualified for commercial/industrial environments without extended thermal derating. |
Pinout & Package
The UDN2916EB-T is supplied in a 44-pin power PLCC (Package EB) with 11 internally fused leads per side and webbed batwing construction for enhanced thermal dissipation (θJA = 30°C/W on multilayer board). The package includes dedicated ground planes and isolated sense-return paths to minimize IR error in current sensing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7–17, 29–39 | Power Batwing Leads | Internally fused thermal tabs - soldered to large copper areas for ≤30°C/W system-level θJA. |
| VBB (Pin 24) | Motor Supply Input | 45 V max input; requires ≥47 μF electrolytic decoupling adjacent to pin for EMI suppression. |
| VCC (Pin 44) | Logic Supply Input | 5 V ±5% supply for internal logic; separate from motor ground to avoid noise coupling. |
| SENSE 1 / SENSE 2 (Pins 15, 27) | Current Sense Inputs | Differential inputs referenced to E1/E2; require Kelvin connection to RS to reject PCB trace IR drop. |
| PHASE 1 / PHASE 2 (Pins 11, 32) | Bridge Direction Control | CMOS-compatible inputs defining current polarity per H-bridge; internally pulled high. |
| I₀ / I₁ (Pins 10, 31) | Current Limit Select | Two-bit logic interface selecting 0%, 33%, 67%, or 100% of full-scale ITRIP - enables microprocessor torque modulation. |
| PWM 1 / PWM 2 (Pins 9, 33) | External PWM Enable | Optional gate control for disabling PWM action while retaining PHASE/I₀/I₁ state - supports rapid decay modes. |
| OUT 1A / OUT 1B / OUT 2A / OUT 2B (Pins 13, 14, 25, 26) | H-Bridge Outputs | Low-saturation source/sink drivers; each pair drives one motor winding with integrated clamp/flyback diodes. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM bridges | Enables simultaneous, asynchronous current control of two stepper motor phases or two DC motors without shared timing constraints. |
| Integrated clamp and flyback diodes | Eliminates need for 8 external diodes; handles inductive kickback up to 45 V with <50 μA leakage at rated voltage. |
| Fixed off-time current regulation | RC-timed monostable ensures stable chopping frequency >20 kHz - avoids audible noise and simplifies EMI filtering. |
| Logic-level current limit selection | I₀/I₁ inputs allow real-time torque scaling (e.g., 100% for acceleration, 67% for holding) using standard MCU GPIOs. |
| Batwing PLCC thermal design | 44-pin EB package achieves 30°C/W θJA - supports 750 mA per bridge continuously with minimal external heatsinking. |
Applications
| Bipolar Stepper Motor Control | Industrial DC Motor Positioning |
|---|---|
|
Use Scenario: Driving NEMA 17 stepper motors in CNC tool changers requiring precise 1.8° step resolution and smooth half-step transitions. IC Role / Device Role / Timing Role: Dual full-bridge driver providing independent phase current control, PHASE-directed winding polarity, and I₀/I₁-modulated torque matching across 8-step sequences. Use Value: Enables constant-torque half-stepping by digitally switching between 100% (single-phase-on) and 67% (dual-phase-on) current levels - eliminating torque ripple at intermediate positions. |
Use Scenario: Bidirectional speed and direction control of 24 V DC gearmotors in automated packaging conveyors with dynamic load changes. IC Role / Device Role / Timing Role: Dual H-bridge motor driver delivering 750 mA per channel with integrated PWM current limiting and thermal protection. Use Value: Sustains 750 mA continuous output under 45 V supply with <1.8 V total saturation drop - minimizing power loss and enabling compact enclosure thermal design. |
| Microstepping Motion Systems | Legacy Equipment Retrofit |
|
Use Scenario: Implementing 1/4-step microstepping in medical lab automation stages where vibration-sensitive sample handling demands low-current ripple. IC Role / Device Role / Timing Role: Precision current regulator using VREF-adjustable ITRIP and RC-timed off-time to maintain sub-100 mA average winding current with <2 μs timing jitter. Use Value: Achieves smooth microstepping via analog VREF tuning and fixed 46 μs off-time - eliminates need for external DAC or complex current-loop controllers. |
Use Scenario: Replacing obsolete PBL3717 or UC3770 dual motor drivers in field-deployed HVAC damper actuators with no PCB redesign. IC Role / Device Role / Timing Role: Pin-compatible functional replacement offering identical 44-pin PLCC footprint, logic-level interface, and 45 V/750 mA rating. Use Value: Maintains existing firmware and layout while upgrading to Allegro's integrated thermal shutdown and lower saturation voltage - extending field reliability. |
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 | 40 V max VBB, 1.5 A peak current, integrated current-sense amplifier, SPI interface | Requires firmware update for SPI register access; supports higher peak loads but lower voltage margin than UDN2916EB-T | Preferred for new designs needing programmable current profiles and diagnostic feedback; not pin-compatible |
| DRV8825PWPR | 45 V max VBB, 2.2 A peak, microstepping indexer, 3.3/5 V logic, thermal pad | Includes onboard step/direction logic and 1/32 microstepping - eliminates external MCU sequencing logic | Best for cost-sensitive new designs prioritizing integration over legacy interface compatibility |
Compared with UDN2916EB-T, the A4970KLPTR-T offers higher peak current and digital configurability but requires SPI infrastructure, while the DRV8825PWPR integrates microstepping logic and supports higher currents but lacks the UDN2916EB-T's discrete I₀/I₁ torque-scaling interface and batwing thermal design for sustained 750 mA operation.
Availability
UDN2916EB-T is available at Aetrix Electronics and suitable for industrial motion control, legacy equipment maintenance, and stepper motor retrofit applications requiring stable component supply despite end-of-life status.
Supply support for UDN2916EB-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 of high-performance magnetic sensors and precision power ICs, specializing in motion control, current sensing, and motor driver solutions for automotive and industrial markets.
The UDN2916EB-T belongs to Allegro's legacy dual full-bridge motor driver family, engineered for robust bipolar stepper and dual DC motor control in space-constrained industrial systems with emphasis on thermal resilience and analog current regulation.
FAQ
What is the maximum continuous output current supported by the UDN2916EB-T?
The UDN2916EB-T supports 750 mA continuous output current per bridge under specified thermal conditions. This rating assumes operation within the –20°C to +85°C ambient range, proper PCB copper area for heat dissipation (≥6 cm² connected to batwing leads), and VBB ≤ 45 V. Exceeding 750 mA continuously risks triggering thermal shutdown at 170°C junction temperature.
Is the UDN2916EB-T still in production, and what is its lifecycle status?
The UDN2916EB-T is a discontinued product no longer in active production. Allegro MicroSystems designated it as Pre-End of Life as of November 1, 2010, and it entered final Last Time Buy phase shortly thereafter. Aetrix Electronics maintains limited legacy stock with full traceability for ongoing maintenance and repair of installed systems.
How does the UDN2916EB-T implement PWM current control without an external oscillator?
The UDN2916EB-T uses an internal monostable multivibrator triggered by the SENSE comparator output. When winding current reaches the VREF/10RS trip threshold, the monostable turns off the source driver for a fixed duration determined by external RT and CT components (toff = RT × CT). This self-timed, RC-controlled PWM eliminates need for external clock sources while maintaining >20 kHz chopping frequency.
Can the UDN2916EB-T be used for microstepping, and what design considerations apply?
Yes, the UDN2916EB-T supports analog microstepping via adjustable VREF and fixed off-time PWM. To achieve stable sub-step resolution, VREF must be precisely regulated, RS selected per ITRIP = VREF/10RS, and RC timing tuned to maintain off-time between 15–35 μs - avoiding audible noise while ensuring current decay matches motor inductance. External filtering of VREF is recommended for high-resolution applications.
What is the purpose of the batwing leads in the UDN2916EB-T's PLCC package?
The batwing leads (Pins 7–17 and 29–39) in the UDN2916EB-T's 44-pin PLCC package are internally fused thermal tabs designed to transfer heat directly from the die to large PCB copper areas. Their webbed construction achieves θJA = 30°C/W - significantly lower than standard PLCC packages - enabling sustained 750 mA per bridge operation without supplemental heatsinks when properly mounted.
UDN2916EB-T 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-T FAQ
1.How can I place an order for UDN2916EB-T through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2916EB-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 UDN2916EB-T reliable?
The price and inventory of UDN2916EB-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2916EB-T is usually 5 days.
3.What payment methods are accepted for UDN2916EB-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2916EB-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2916EB-T?
UDN2916EB-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2916EB-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 UDN2916EB-T?
For technical support, including UDN2916EB-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2916EB-T requirements.
6.How does Aetrix verify that UDN2916EB-T is sourced from the original manufacturer or authorized distributors?
All UDN2916EB-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 UDN2916EB-T meets industry standards.
7.What is the process for return or replacement of UDN2916EB-T?
All UDN2916EB-T units undergo pre-shipment inspection (PSI). If there is an issue with UDN2916EB-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 UDN2916EB-T part is unused and in its original packaging.
Return procedure for UDN2916EB-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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