Part A
A3966SLB
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 3540 Stückzahl
- Package
- SOIC-16
- Series
- PMIC Motor Treiber, Controller
Replacement verdict
Compatible functional replacement candidate
The A3966SLBTR-T is a tape-and-reel packaged variant of the A3966SLB, sharing the same dual full-bridge PWM motor driver die, electrical ratings, and 16-pin SOIC footprint. The only meaningful difference is the delivery format, making the A3966SLBTR-T a direct functional replacement for the A3966SLB in automated assembly environments.
Function
High match
Package Type
High match
Electrical Ratings
High match
Packaging Format
Validation required
Parts at a glance
Part B
A3966SLBTR-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 7796 Stückzahl
- Package
- SOIC-16
- Series
- PMIC Motor Treiber, Controller
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | A3966SLBTR-T | A3966SLB | Why it matters |
|---|---|---|---|
| Manufacturer | Allegro MicroSystems | Allegro MicroSystems | Identical manufacturer ensures the same design, process, and quality standards, which is essential for functional substitutability. |
| Product Category | Motor Driver ICs | Motor Driver ICs | Both parts belong to the same functional category, confirming they serve the same application role. |
| Motor Type | Stepper | Stepper | The motor type must match for the driver to be electrically and functionally compatible with the intended load. |
| Output Configuration | Dual Full-Bridge | Dual Full-Bridge | The output stage topology determines how many windings or loads can be driven and how the IC is wired into the system. |
| Supply Voltage Range | 4.75 V to 5.25 V | 4.75 V to 5.25 V | The logic supply voltage range must be compatible with the system rail to ensure proper operation and logic-level interfacing. |
| Output Current per Channel | 750 mA | 750 mA | Current rating determines the maximum load the driver can handle without overheating or damage. |
| Mounting Type | Surface Mount | Surface Mount | Mounting type must match the PCB assembly process and footprint for the part to be physically interchangeable. |
| Package / Case | 16-PowerSOIC (0.295", 7.50mm Width) | 16-PowerSOIC (0.295", 7.50mm Width) | Package and case style affect footprint, thermal performance, and mechanical fit on the board. |
| Packaging | Tape & Reel (TR) | Tube | Packaging differs between the two parts, which affects handling, automated assembly, and minimum order quantities. |
| Operating Temperature Range | -20°C to 85°C | -20°C to 85°C | The temperature range must cover the application environment to ensure reliable operation and lifetime. |
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-T |
|---|---|---|
| Part Status | Obsolete | Active |
| 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 A3966SLBTR-T and the A3966SLB?
The A3966SLBTR-T is the tape and reel packaged version of the A3966SLB. Both devices are functionally identical dual full-bridge motor drivers. The "-T" suffix indicates tape and reel packaging for automated assembly, while the base A3966SLB is typically supplied in tube or bulk packaging. Electrical specifications and die content are the same.
Are the A3966SLBTR-T and A3966SLB electrically interchangeable?
Yes. Both devices share the same datasheet specifications, including supply voltage range, output current rating, logic input thresholds, and internal PWM current control. The only documented difference is the shipping packaging format, not the electrical performance.
What is the output current rating for these devices?
Per the Allegro MicroSystems A3966 datasheet, each full-bridge output is rated for a continuous output current of ±650 mA and a peak output current of ±1.1 A. These ratings apply to both the A3966SLBTR-T and A3966SLB.
What is the supply voltage range for the A3966SLBTR-T and A3966SLB?
The A3966 family operates from a motor supply voltage (VBB) of 4.75 V to 30 V. The logic supply voltage (VCC) range is 4.5 V to 5.5 V. These limits are identical for both the tape and reel and non-tape and reel versions.
Do the A3966SLBTR-T and A3966SLB use the same package and pinout?
Yes. Both devices are offered in the same 16-pin SOIC-W (wide body) package with identical pin assignments. The package code "LB" in the part number denotes this package. PCB land patterns and thermal characteristics are the same for both ordering options.
Can the A3966SLBTR-T be used as a drop-in replacement for the A3966SLB?
Yes, provided the PCB assembly process supports tape and reel feeding. Since the die, package, and pinout are identical, no electrical or layout changes are required. The only consideration is the packaging format for the pick-and-place equipment.
What is the operating temperature range for these motor drivers?
The A3966SLBTR-T and A3966SLB are specified for an operating ambient temperature range of -20°C to +85°C. This is a common industrial temperature range and is identical for both part numbers.
Which applications are suitable for the A3966SLBTR-T and A3966SLB?
These dual full-bridge drivers are intended for bipolar stepper motor control and dual DC motor drive in applications such as printers, scanners, copiers, and industrial automation equipment. They feature internal PWM current control, fixed off-time, and thermal shutdown protection.