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 A3966SLB-T are functionally equivalent dual full-bridge PWM motor drivers from Allegro MicroSystems, sharing identical die specifications, electrical ratings, and package footprint. The -T suffix denotes a tape-and-reel packaging option rather than a functional variant, making these parts interchangeable in design and application. Validation of the exact packing quantity and moisture sensitivity level per the specific order is recommended before committing to high-volume production.
Output Type
High match
Channel Count
High match
Package Type
High match
Packaging Option
Validation required
Parts at a glance
Part B
A3966SLB-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 3731 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 | A3966SLB-T | Why it matters |
|---|---|---|---|
| Manufacturer | Allegro MicroSystems | Allegro MicroSystems | Identical manufacturer ensures the same design, process, and quality standards for both parts. |
| Motor Type | Bipolar Stepper | Bipolar Stepper | Both devices target the same motor type, so they are functionally interchangeable in stepper drive applications. |
| Output Current per Channel | 650 mA | 650 mA | Matching current rating ensures the same torque and drive capability for the connected motor. |
| Supply Voltage Range | 4.75 V to 5.25 V | 4.75 V to 5.25 V | Identical logic supply range means the same power rail can be used without redesign. |
| Output Voltage Range | 4.75 V to 30 V | 4.75 V to 30 V | Same motor supply range allows the same motor and power supply to be reused. |
| Mounting Type | Surface Mount | Surface Mount | Same mounting style ensures board-level drop-in compatibility. |
| Package / Case | 16-PowerSOIC (0.295", 7.50mm Width) | 16-PowerSOIC (0.295", 7.50mm Width) | Identical package footprint allows the same PCB layout to be used for either part. |
| Operating Temperature Range | -20°C to 85°C | -20°C to 85°C | Same thermal limits ensure equivalent reliability across the same application environments. |
| Supplier Packaging | Tube | Tape & Reel | Packaging differs, which affects automated assembly handling but not electrical or functional performance. |
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 | A3966SLB-T |
|---|---|---|
| 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 A3966SLB-T?
The A3966SLB and A3966SLB-T are both dual full-bridge motor driver ICs from Allegro MicroSystems. The "-T" suffix indicates the device is supplied in tape and reel packaging for automated assembly, while the A3966SLB without the suffix is typically supplied in tube or bulk packaging. The electrical specifications and functional performance of the two variants are identical.
Are the A3966SLB and A3966SLB-T electrically identical?
Yes. Both variants share the same die, electrical characteristics, and functional specifications. The only documented difference is the shipping and packaging format, not the device parameters.
What is the function of the A3966SLB and A3966SLB-T?
Both devices are dual full-bridge motor drivers designed to drive two DC motors or one stepper motor. They include internal PWM current control, fixed off-time chopping, and output current capability suitable for small to medium motor applications.
Can the A3966SLB and A3966SLB-T be used interchangeably in a design?
Yes, from an electrical and functional standpoint the two variants are interchangeable. The choice between them depends only on the assembly process: tape and reel for automated pick-and-place, or tube/bulk for manual or low-volume assembly.
What package type do the A3966SLB and A3966SLB-T use?
Both variants are offered in the same package type as specified in the Allegro A3966 datasheet. The package designation "SLB" corresponds to the device's power surface-mount package. The "-T" suffix does not change the package outline, only the packaging medium.
Do the A3966SLB and A3966SLB-T have the same operating temperature range?
Yes. Since both variants use the same die and package, they share the same operating temperature range as specified in the Allegro A3966 datasheet. The packaging suffix does not affect thermal or operating specifications.
Which variant should be selected for high-volume production?
The A3966SLB-T is generally preferred for high-volume production because tape and reel packaging is compatible with automated pick-and-place assembly equipment. The A3966SLB in tube or bulk packaging is more suitable for prototyping, manual assembly, or low-volume runs.
Are the A3966SLB and A3966SLB-T RoHS compliant?
RoHS compliance depends on the specific ordering code and the manufacturer's current documentation. Designers should verify the RoHS status of each variant directly from the Allegro MicroSystems datasheet or an authorized distributor such as DigiKey or Mouser before finalizing a bill of materials.