Part A
A3966SLB
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 3540 PCS
- Package
- SOIC-16
- Series
- PMIC - Motor Drivers, Controllers
Replacement verdict
Compatible functional replacement candidate
The A3966SLB and A3966SLBTR are functionally equivalent, with the TR suffix denoting tape-and-reel packaging rather than any electrical or functional difference. Both devices share identical die, electrical characteristics, and operating parameters, making them interchangeable in circuit design. The only distinction lies in packaging format and orderable part number, which affects procurement and assembly processes but not functional performance.
Function Type
High match
Electrical Characteristics
High match
Package Type
High match
Packaging Format
Validation required
Parts at a glance
Part B
A3966SLBTR
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 5756 PCS
- Package
- SOIC-16
- Series
- PMIC - Motor Drivers, Controllers
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | A3966SLB | A3966SLBTR | Why it matters |
|---|---|---|---|
| Manufacturer | Allegro MicroSystems | Allegro MicroSystems | Same manufacturer ensures identical design, process, and quality standards. |
| Product Category | Motor Driver ICs - Stepper Motor Controller | Motor Driver ICs - Stepper Motor Controller | Confirms both parts serve the same functional role in a circuit. |
| Package / Case | 16-PowerSOIC (0.295", 7.50mm Width) | 16-PowerSOIC (0.295", 7.50mm Width) | Identical footprint allows drop-in replacement on the same PCB pad layout. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting method ensures mechanical compatibility in assembly. |
| Supply Voltage Range | 4.75 V to 5.25 V (logic), 4.5 V to 36 V (motor) | 4.75 V to 5.25 V (logic), 4.5 V to 36 V (motor) | Matching voltage ranges guarantee electrical compatibility in the target application. |
| Output Current | 750 mA per channel | 750 mA per channel | Same current rating ensures equivalent drive capability for the stepper motor. |
| Operating Temperature | -20°C to +85°C | -20°C to +85°C | Identical thermal limits ensure the same environmental operating envelope. |
| Number of Outputs | 2 (dual full-bridge) | 2 (dual full-bridge) | Same channel count supports identical motor drive topology. |
| Packaging / Ordering | Tube | Tape & Reel | Different packaging affects handling, automated assembly, and minimum order quantities, though the die and performance are identical. |
Need help validating a replacement?
Send your BOM and application constraints for technical and sourcing review.
Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | A3966SLB | A3966SLBTR |
|---|---|---|
| Part Status | Obsolete | Obsolete |
| Motor Type - Stepper | Bipolar | Bipolar |
| Function | Driver - Fully Integrated, Control and Power Stage | Driver - Fully Integrated, Control and Power Stage |
| Output Configuration | Half Bridge (4) | Half Bridge (4) |
| Interface | Parallel | Parallel |
| Technology | Bipolar | Bipolar |
| Applications | General Purpose | General Purpose |
| Current - Output | 650mA | 650mA |
| Voltage - Supply | 4.75V ~ 5.5V | 4.75V ~ 5.5V |
| Voltage - Load | 4.75V ~ 30V | 4.75V ~ 30V |
| Operating Temperature | -20°C ~ 150°C (TJ) | -20°C ~ 150°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount |
Frequently asked questions
What is the difference between the A3966SLB and the A3966SLBTR?
The A3966SLB and A3966SLBTR are the same Allegro MicroSystems dual full-bridge motor driver die and electrical specification; the difference is the shipping form. The A3966SLB is supplied in a tube, while the A3966SLBTR is supplied in tape and reel for automated pick-and-place assembly.
Are the A3966SLB and A3966SLBTR electrically identical?
Yes. Both part numbers use the same A3966 die and the same 16-lead SOIC (suffix LB) package, so the electrical ratings, pinout, and functional behavior are identical. The suffix TR denotes tape-and-reel packing rather than a different silicon revision.
Can the A3966SLB and A3966SLBTR be used interchangeably in a design?
Yes, they are interchangeable in the application because they share the same package, pinout, and electrical characteristics. The only practical difference is the packaging format, which affects board-assembly handling rather than circuit performance.
What is the function of the A3966SLB and A3966SLBTR?
Both devices are dual full-bridge motor drivers designed to drive two DC motors or one stepper motor. They include internal clamp diodes for inductive load protection and are intended for low-voltage motor-control applications.
What package do the A3966SLB and A3966SLBTR use?
Both part numbers use the Allegro LB suffix package, a 16-lead SOIC surface-mount package. The package body and lead configuration are the same for the tube and tape-and-reel versions.
Which version should be selected for automated production?
The A3966SLBTR should be selected for automated production because tape-and-reel packaging is designed for pick-and-place assembly equipment. The A3966SLB tube version is typically used for manual assembly, prototyping, or low-volume builds.
Do the A3966SLB and A3966SLBTR have the same operating temperature range?
Yes. Because both are the same device in the same LB package, they share the same operating temperature range as specified in the Allegro A3966 datasheet. The packaging format does not change the temperature rating.