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Allegro MicroSystems UDN2916LB
- Part No.:
- UDN2916LB
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
UDN2916LB.pdf
- Description:
- IC MOTOR DRIVER BIPOLAR 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,980
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Product details
Overview
UDN2916LB from Allegro MicroSystems is a dual full-bridge PWM motor driver IC designed to drive both windings of bipolar stepper motors or bidirectionally control 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 systems requiring precise microstepping and thermal robustness.
For engineers reviewing the UDN2916LB datasheet, UDN2916LB pinout, UDN2916LB application, or UDN2916LB equivalent, this page provides verified technical context, package-specific thermal design guidance, real-world current-sensing implementation details, and validated alternative options for legacy design support and migration planning.
Technical Context
The UDN2916LB integrates two independent H-bridge outputs with integrated clamp and flyback diodes, fixed off-time PWM current regulation (46 μs typical), and internal thermal shutdown at 170°C. Each bridge uses external RC timing (RT/CT) and sense resistor (RS) to set peak current, with trip threshold determined by VREF/10 RS.
Logic-level PHASE inputs control current direction per bridge; I0/I1 inputs digitally select four discrete current levels; VREF supports analog fine-tuning for microstepping. Internal dead time (~2 μs) prevents shoot-through during PHASE transitions, and batwing SOICW package enables enhanced thermal dissipation (θJA = 55°C/W on single-layer board).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 750 mA continuous per bridge - supports sustained bipolar stepper operation without external heatsink under moderate ambient conditions. |
| Motor Supply Voltage | 45 V max - compatible with 24 V and 36 V industrial motor rails, including brushed DC and stepper systems with back-EMF margins. |
| PWM Fixed Off-Time | 46 μs typical (RT = 56 kΩ, CT = 820 pF) - ensures current chopping above audible range while maintaining stable regulation for inductive loads ≥3 mH. |
| Output Saturation Voltage | ≤1.5 V total (source + sink) at 750 mA - minimizes conduction loss and junction heating during high-current hold phases. |
| Thermal Shutdown Threshold | 170°C junction temperature - protects against latch-up or permanent damage during overload or poor PCB thermal design. |
| Logic Supply Range | 4.75–5.25 V - requires stable 5 V rail; incompatible with 3.3 V logic without level translation. |
| Operating Ambient Range | –40°C to +105°C (Q grade) - qualified for extended-temperature industrial and automotive under-hood adjacent applications. |
Pinout & Package
UDN2916LB is supplied in a 24-pin surface-mount wide SOIC (SOICW) package with two pairs of fused batwing leads (Pins 6, 7, 18, 19) acting as thermally enhanced power tabs. Package dimensions: 15.40 mm × 10.30 mm × 2.65 mm (L × W × H), lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12 | Ground / Logic / Sense / Control | Pins 1–5, 10–12: GND (multiple ground returns); Pin 6/7: Batwing tab (GND); Pin 8: SENSE 1; Pin 9: PHASE 1 - dedicated low-impedance paths essential for accurate current sensing and noise immunity. |
| 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24 | Power / Output / Reference / Timing | Pins 13–14: OUT 1A/1B; Pins 15–16: E1/SENSE 1; Pins 17–18: Batwing tab (VBB return); Pins 19–20: OUT 2A/2B; Pin 21: E2; Pin 22: VREF; Pins 23–24: VCC/VBB - batwing pins 17/18 and 6/7 must be soldered to large copper pour for thermal management. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent PWM bridges | Enables simultaneous, asynchronous control of two motor windings - critical for bipolar stepper half-step and microstep sequencing without external controllers. |
| Programmable current limit (4 levels) | I0/I1 logic inputs select 0%, 33%, 67%, or 100% of max current - allows torque scaling for start-up vs. hold, reducing power dissipation by >60% in idle states. |
| Integrated clamp/flyback diodes | Eliminates need for 8 external diodes - reduces BOM count and layout area while ensuring safe inductive energy recirculation during PWM decay. |
| Batwing SOICW thermal design | Fused external leads (Pins 6, 7, 18, 19) provide 20–30% better power dissipation vs. standard SOIC - enables 750 mA operation at TA = 85°C with minimal copper area. |
| Internal dead-time generation | ~2 μs automatic delay between source/sink switching - prevents shoot-through without requiring external timing circuitry or complex gate-drive design. |
Applications
| Bipolar Stepper Motor Control | Industrial Dual DC Motor Drive |
|---|---|
|
Use Scenario: Precision open-loop positioning in CNC tool changers and lab automation stages using 1.8° bipolar stepper motors. IC Role / Device Role / Timing Role: Dual full-bridge driver executing PHASE+PWM sequences to energize windings with synchronized current regulation and fast decay. Use Value: Enables microstepping down to 1/4-step via VREF tuning and discrete current scaling - achieves sub-micron repeatability without closed-loop feedback. |
Use Scenario: Bidirectional actuation of two independent linear actuators in packaging machinery, each requiring independent speed/torque control. IC Role / Device Role / Timing Role: Independent H-bridge controller per channel, using separate PHASE and I0/I1 inputs to manage direction and load current per actuator. Use Value: Reduces system component count by integrating dual bridges with thermal protection - eliminates need for discrete MOSFET drivers and external current-sense amps. |
| Microprocessor-Controlled Motion System | Thermally Constrained Embedded Motion |
|
Use Scenario: Microcontroller-based robotic arm joint control where firmware dynamically adjusts torque per phase using I0/I1 during acceleration/deceleration. IC Role / Device Role / Timing Role: Logic-compatible interface translating MCU GPIO signals into PWM-gated motor current with hardware-enforced current limits. Use Value: Offloads current regulation timing from MCU - frees CPU cycles for path planning while guaranteeing safe peak current even during rapid direction changes. |
Use Scenario: Compact medical pump module requiring silent, reliable motor control within strict thermal envelope (<65°C case temp) and limited PCB space. IC Role / Device Role / Timing Role: High-efficiency dual bridge with low VCE(SAT) and batwing thermal path - dissipates <1.8 W total at 500 mA per bridge. Use Value: Achieves 750 mA drive capability in SOICW footprint without forced air - meets IEC 60601 thermal safety requirements for Class II devices. |
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 |
|---|---|---|---|
| A4970 | Successor device with higher 1 A continuous current, integrated charge pump, and wider 5–40 V VBB range; requires external sense resistors but adds current monitor output. | Supports higher torque motors and lower-voltage systems (e.g., 12 V robotics); lacks batwing thermal enhancement - requires larger PCB copper area for equivalent thermal performance. | Select A4970 for new designs needing higher current, extended voltage range, or diagnostic capability; verify layout thermal margin due to non-batwing SOIC package. |
| UC3770 | Legacy dual H-bridge with no internal PWM - requires external oscillator and comparator; 1.2 A peak current but no thermal shutdown or clamp diodes. | Suitable only for simple on/off or externally controlled PWM systems; demands additional components for current regulation and protection - increases BOM and failure points. | Choose UC3770 only for cost-sensitive legacy replacements where external control circuitry already exists; not recommended for new designs due to missing safety features. |
Compared with UDN2916LB, the A4970 offers higher current and integrated diagnostics but requires more careful thermal layout, while the UC3770 lacks internal PWM and protection - making UDN2916LB the optimal balance of integration, thermal robustness, and drop-in compatibility for existing batwing SOICW designs.
Availability
UDN2916LB is available at Aetrix Electronics and suitable for industrial motion control, precision instrumentation, and embedded actuation systems requiring stable component supply despite end-of-life status.
Supply support for UDN2916LB 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 semiconductor solutions.
The UDN2916LB belongs to Allegro's legacy dual H-bridge motor driver family, engineered specifically for bipolar stepper and dual DC motor applications demanding integrated current regulation, thermal resilience, and industrial-grade reliability.
FAQ
What is the operating temperature range for UDN2916LB?
The UDN2916LB is rated for –40°C to +105°C ambient operation (Q grade), validated across its full electrical specification range. This makes it suitable for industrial environments such as factory automation cabinets or outdoor equipment enclosures where ambient temperatures exceed standard commercial ranges. The device's thermal shutdown activates at 170°C junction temperature, providing overtemperature protection even under transient overload conditions.
Does UDN2916LB require external flyback diodes?
No, UDN2916LB includes integrated clamp and flyback diodes for both bridges - eliminating the need for eight external diodes typically required in discrete H-bridge designs. These internal diodes are rated for 750 mA continuous current and handle inductive kickback during PWM decay, simplifying layout and improving reliability. External diodes may still be added for enhanced thermal performance in high-duty-cycle applications.
How is current limit set on UDN2916LB?
Current limit on UDN2916LB is set through two mechanisms: (1) digital selection via I0/I1 logic inputs (0%, 33%, 67%, or 100% of maximum), and (2) analog adjustment via VREF voltage and external sense resistor RS, where ITRIP = VREF / (10 × RS). This dual-level control enables coarse torque scaling via firmware and fine microstepping resolution via analog tuning - both fully supported in the UDN2916LB datasheet and application circuits.
What package type does UDN2916LB use, and why does it matter?
UDN2916LB uses a 24-pin batwing SOICW (wide SOIC) package with fused external leads at Pins 6, 7, 18, and 19. These batwings serve as thermally enhanced power tabs, reducing θJA to 55°C/W (vs. ~80°C/W for standard SOIC), enabling 750 mA operation without external heatsinks. Proper soldering of all four batwing leads to large copper pours is mandatory to achieve rated thermal performance - a key design requirement explicitly documented for UDN2916LB.
Is UDN2916LB still in production, and what are the implications?
UDN2916LB is classified as Pre-End of Life (status confirmed January 31, 2011), meaning it remains available for purchase but will enter Last Time Buy within minimum 6 months. For new designs, Allegro recommends migrating to A4970; however, UDN2916LB continues to be stocked by authorized distributors for legacy system repair and continuity. Aetrix Electronics maintains traceable inventory with full lifecycle coordination support for ongoing production programs.
UDN2916LB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- 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:
- 24-SOIC
UDN2916LB FAQ
1.How can I place an order for UDN2916LB through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2916LB 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 UDN2916LB reliable?
The price and inventory of UDN2916LB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2916LB is usually 5 days.
3.What payment methods are accepted for UDN2916LB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2916LB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2916LB?
UDN2916LB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2916LB 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 UDN2916LB?
For technical support, including UDN2916LB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2916LB requirements.
6.How does Aetrix verify that UDN2916LB is sourced from the original manufacturer or authorized distributors?
All UDN2916LB 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 UDN2916LB meets industry standards.
7.What is the process for return or replacement of UDN2916LB?
All UDN2916LB units undergo pre-shipment inspection (PSI). If there is an issue with UDN2916LB, 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 UDN2916LB part is unused and in its original packaging.
Return procedure for UDN2916LB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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