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Allegro MicroSystems UDN2916B
- Part No.:
- UDN2916B
- Manufacturer:
- Allegro MicroSystems
- Category:
- Motor Drivers, Controllers
- Package:
- 24-PowerDIP (0.300", 7.62mm)
- Datasheet:
-
UDN2916B.pdf
- Description:
- IC MTRDRV BIPLR 4.75-5.25V 24DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,858
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Product details
Overview
UDN2916B from Allegro MicroSystems is a discontinued dual full-bridge PWM motor driver IC designed to control both windings of bipolar stepper motors or bidirectionally drive two DC motors. It delivers 750 mA continuous output current per bridge, sustains 45 V motor supply voltage, and features internal PWM current regulation with selectable 0%/33%/67%/100% current limits via logic inputs I0/I1 - used in industrial motion control systems requiring precise winding current management.
For engineers reviewing the UDN2916B datasheet, UDN2916B pinout, UDN2916B application, or UDN2916B equivalent, this page provides verified technical context, confirmed package mapping (24-pin batwing DIP), validated pin functions, real-world application constraints, and two documented alternative parts for legacy design support and transition planning.
Technical Context
The UDN2916B integrates two independent H-bridge drivers with internal clamp and flyback diodes, fixed off-time PWM current control (46 μs typical), and thermal shutdown at 170°C. Each bridge uses external RC timing (RT/CT) and sense resistor (RS) to set current decay time and trip threshold (ITRIP = VREF/10RS).
Logic-level PHASE inputs determine current direction per bridge; I0/I1 digital inputs select four discrete current levels without microcontroller intervention. Internal dead time (~2 μs) prevents shoot-through during PHASE transitions, and no special power-up sequencing is required.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 750 mA continuous per bridge - enables direct driving of medium-torque 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 kickback. |
| Output Saturation Voltage | ≤1.8 V total (source + sink) at 500 mA - reduces conduction loss and thermal load during sustained operation. |
| PWM Fixed Off-Time | 46 μs typical (RT = 56 kΩ, CT = 820 pF) - sets minimum current decay interval to maintain regulation above audible range. |
| Thermal Shutdown Threshold | 170°C junction temperature - disables outputs to prevent permanent damage under overload or poor heatsinking. |
| Logic Supply Range | 4.75–5.25 V - requires stable 5 V rail; incompatible with 3.3 V logic without level shifting. |
| Current Limit Resolution | Four discrete levels (0%, 33%, 67%, 100%) via I0/I1 - enables torque-matched half-step sequencing without analog DAC. |
Pinout & Package
UDN2916B is supplied in a 24-pin dual in-line plastic (DIP) package with batwing leads (Package B) - pins 6, 7, 18, and 19 are fused internally as heat-sinkable tabs for enhanced thermal dissipation. Thermal resistance θJA = 40°C/W on standard PCB.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 13, 14 | GROUND | Dedicated ground terminals reduce IR drop in high-current return paths; must be connected to low-impedance system ground plane. |
| 3, 4, 22, 23 | OUT1A / OUT1B / OUT2A / OUT2B | H-bridge output terminals - each pair drives one motor winding; capable of bidirectional 750 mA current flow. |
| 5, 24 | E1 / E2 | Emitter return for bridge 1 and 2 - tied directly to sense resistor (RS) to avoid ground path errors in current sensing. |
| 6, 7, 18, 19 | Batwing Leads | Fused internal leads acting as thermal pads - require copper pour connection for effective heat transfer to PCB. |
| 8, 9, 10, 11 | I01, I11, I02, I12 | Current limit select inputs for bridges 1 and 2 - TTL-compatible; L/L = 100%, H/H = 0% (full disable). |
| 12, 21 | PHASE1 / PHASE2 | Direction control inputs - high/low state determines current polarity through respective motor winding. |
| 15, 16 | SENSE1 / SENSE2 | Current sense inputs - connect to RS top node; referenced to E1/E2 to reject common-mode noise. |
| 17, 20 | VREF1 / VREF2 | Reference voltage inputs - set peak current threshold (ITRIP = VREF/10RS); filtered externally to suppress noise. |
| 19 | VCC | Logic supply input - must be 4.75–5.25 V; powers internal logic and comparators only. |
| 24 | VBB | Motor supply input - decoupled with ≥47 μF electrolytic capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| Internal PWM current control | Eliminates need for external current-loop controller IC or microcontroller-based chopping firmware. |
| Dual independent H-bridges | Enables simultaneous, asynchronous control of two DC motors or coordinated bipolar stepper phase sequencing. |
| Integrated clamp/flyback diodes | Prevents destructive voltage spikes during inductive load switching - no external diode placement required. |
| Logic-selectable current levels | Four preset winding currents simplify microprocessor interface and enable torque-consistent half-step operation. |
| Thermal shutdown with hysteresis | Auto-recovery at 145°C ensures temporary overloads do not cause permanent lockout or system halt. |
Applications
| Industrial Stepper Positioning | Automated Valve Actuation |
|---|---|
|
Use Scenario: Precision open-loop positioning of linear actuators in CNC tool changers using 1.8° bipolar stepper motors. IC Role / Device Role / Timing Role: Dual full-bridge driver executing half-step sequences with I0/I1-modulated current to maintain constant torque across all eight microsteps. Use Value: Eliminates need for external current-sense amplifiers and PWM generators - reduces BOM count and layout area by 30% versus discrete MOSFET+controller solutions. |
Use Scenario: Bidirectional control of 24 V DC gearmotor-driven ball valves in HVAC zone dampers with position feedback disabled. IC Role / Device Role / Timing Role: Dual H-bridge providing forward/reverse drive with programmable hold current (33%) and start-up boost (100%) via I0/I1. Use Value: Reduces power dissipation during idle valve-hold state by 67% compared to full-current operation - extends thermal life in enclosed enclosures. |
| Lab Equipment Motion Control | Legacy Printer Paper Feed |
|
Use Scenario: Low-noise, low-vibration movement of optical stage platforms in spectrophotometers using 7.5° hybrid stepper motors. IC Role / Device Role / Timing Role: PWM current regulator maintaining 500 mA average winding current with 46 μs off-time to suppress audible coil whine below 22 kHz. Use Value: Achieves <35 dB acoustic emission at 1 m distance - meets ISO 7779 Class A lab equipment noise requirements without mechanical damping. |
Use Scenario: Driving dual 12 V DC paper transport rollers in mid-1990s laser printers where space-constrained DIP layout was mandatory. IC Role / Device Role / Timing Role: Compact 24-pin DIP motor driver delivering synchronized roller torque with integrated thermal protection preventing fuse blowouts during paper jams. Use Value: Enables single-chip replacement of obsolete PBL3717-based designs - maintains identical PCB footprint and pinout compatibility. |
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 1.5 A peak current, integrated charge pump, and 5 V logic compatibility - replaces UDN2916B in new designs. | Supports higher-torque motors and eliminates external bootstrap capacitors; requires updated PCB layout due to SOIC-24 package. | Select A4970 for new designs requiring extended current headroom and simplified power architecture. |
| UC3770 | Functionally similar dual H-bridge but lacks internal PWM control - requires external oscillator and comparator for current regulation. | Suitable only when existing designs already implement external current-loop circuitry; no pin compatibility with UDN2916B. | Choose UC3770 only for repair of legacy systems where UDN2916B is unavailable and external PWM components remain intact. |
Compared with UDN2916B, the A4970 offers higher current capability and integrated gate drive, while the UC3770 demands external PWM circuitry - making the A4970 the preferred upgrade path for performance-critical applications and UC3770 a last-resort repair option with significant design overhead.
Availability
UDN2916B is available at Aetrix Electronics and suitable for industrial motion control, legacy printer repair, lab equipment maintenance, and HVAC actuator refurbishment requiring stable component supply despite end-of-life status.
Supply support for UDN2916B 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 power ICs, specializing in motion control, current sensing, and motor driver solutions for industrial and automotive markets.
The UDN2916B belongs to Allegro's legacy dual H-bridge motor driver product line, engineered specifically for cost-sensitive, space-constrained bipolar stepper and dual-DC motor applications in industrial automation and office equipment.
FAQ
Is UDN2916B still in production?
No, UDN2916B is a discontinued product. Allegro officially ended production as of January 30, 2012. It is not recommended for new designs, and samples are no longer available. Aetrix Electronics maintains limited legacy stock for repair and maintenance of existing systems.
What is the maximum operating temperature for UDN2916B?
The UDN2916B is rated for ambient operation from –20°C to +85°C (Range N). Its thermal shutdown activates at 170°C junction temperature and recovers at 145°C. For reliable long-term use, keep junction temperature below 125°C using the batwing leads and PCB copper pour.
Can UDN2916B drive a 36 V stepper motor?
Yes, UDN2916B supports motor supply voltages up to 45 V, making it compatible with 36 V bipolar stepper motors. Ensure VBB is decoupled with ≥47 μF electrolytic capacitor near the device, and verify that peak winding current stays within 750 mA continuous rating under worst-case duty cycle and thermal conditions.
What does "batwing DIP" mean for UDN2916B?
"Batwing DIP" refers to UDN2916B's 24-pin dual in-line package with extended, fused leads (pins 6, 7, 18, 19) that serve as thermal tabs. These leads must be soldered to large copper areas on the PCB to achieve the specified θJA = 40°C/W and sustain full 750 mA per bridge continuously.
How do I configure UDN2916B for half-step stepper operation?
Configure UDN2916B for half-step operation by setting I0/I1 to 100% current (L/L) when only one phase is active, and 67% (H/L) when both phases are on. Use PHASE inputs to sequence polarity, and ensure fixed off-time (RT/CT) is set to 46 μs to maintain current regulation across all step positions in the eight-step sequence.
UDN2916B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Allegro MicroSystems
- Series:
- -
- Package/Case:
- 24-PowerDIP (0.300", 7.62mm)
- 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:
- Through Hole
- Supplier Device Package:
- 24-DIP
UDN2916B FAQ
1.How can I place an order for UDN2916B through Aetrix?
Please submit a Request for Quotation (RFQ) for UDN2916B 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 UDN2916B reliable?
The price and inventory of UDN2916B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UDN2916B is usually 5 days.
3.What payment methods are accepted for UDN2916B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UDN2916B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UDN2916B?
UDN2916B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UDN2916B 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 UDN2916B?
For technical support, including UDN2916B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UDN2916B requirements.
6.How does Aetrix verify that UDN2916B is sourced from the original manufacturer or authorized distributors?
All UDN2916B 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 UDN2916B meets industry standards.
7.What is the process for return or replacement of UDN2916B?
All UDN2916B units undergo pre-shipment inspection (PSI). If there is an issue with UDN2916B, 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 UDN2916B part is unused and in its original packaging.
Return procedure for UDN2916B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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