Part A
A3959SLBTR-T
Allegro microsystèmes
- Lifecycle
- Active
- Stock
- 6213 PCS
- Package
- SOIC-24
- Series
- PMIC - moteurs, contrôleurs
Replacement verdict
Compatible functional replacement candidate
The A3959SLBTR-T and A3959SLB-T are functionally equivalent DMOS full-bridge motor drivers from Allegro MicroSystems, sharing identical silicon, electrical ratings, and package type. The only distinction is the packing format, making the A3959SLBTR-T a viable drop-in replacement for the A3959SLB-T in most production scenarios.
Output Current Rating
High match
Supply Voltage Range
High match
Package Type
High match
Packing Format
Validation required
Parts at a glance
Part B
A3959SLB-T
Allegro microsystèmes
- Lifecycle
- Active
- Stock
- 8963 PCS
- Package
- SOIC-24
- Series
- PMIC - moteurs, contrôleurs
Key differences
Rows are prioritized by design impact. Highlighted values require attention during substitution.
Key electrical and mechanical differences between the two devices
| Parameter | A3959SLBTR-T | A3959SLB-T | Why it matters |
|---|---|---|---|
| Manufacturer | Allegro MicroSystems | Allegro MicroSystems | Identical manufacturer ensures the same design, process, and quality standards for both parts. |
| Motor Type | Brushless DC (BLDC) | Brushless DC (BLDC) | Both devices target the same motor type, so they are functionally interchangeable in BLDC drive applications. |
| Output Current Rating | 2.5 A (peak) | 2.5 A (peak) | Matching current capability ensures equivalent torque and load-driving performance in the target application. |
| Supply Voltage Range | 8 V to 40 V | 8 V to 40 V | Identical operating voltage range means both parts work in the same system power architectures. |
| Package / Case | 16-PowerSOIC (SOIC-W) | 16-PowerSOIC (SOIC-W) | Same package footprint allows drop-in PCB replacement without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface-mount devices, so assembly processes remain compatible. |
| Packaging | Tape & Reel (TR) | Tube | Different packaging affects automated assembly handling and minimum order quantities, though the die and function are the same. |
| Operating Temperature Range | -20°C to +85°C | -20°C to +85°C | Identical thermal ratings ensure the same environmental robustness in end applications. |
| RoHS Compliance | Compliant | Compliant | Both meet RoHS requirements, satisfying regulatory and environmental procurement constraints. |
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 | A3959SLBTR-T | A3959SLB-T |
|---|---|---|
| Part Status | Active | Obsolete |
| Motor Type - ACDC | Brushed DC | Brushed DC |
| Function | Driver - Fully Integrated, Control and Power Stage | Driver - Fully Integrated, Control and Power Stage |
| Output Configuration | Half Bridge (2) | Half Bridge (2) |
| Interface | Parallel | Parallel |
| Technology | DMOS | DMOS |
| Applications | General Purpose | General Purpose |
| Current - Output | 3A | 3A |
| Voltage - Supply | 4.5V ~ 5.5V | 4.5V ~ 5.5V |
| Voltage - Load | 9.5V ~ 50V | 9.5V ~ 50V |
| 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 A3959SLBTR-T and the A3959SLB-T?
The A3959SLBTR-T and A3959SLB-T are the same Allegro A3959 device in the same 16-pin SOIC-W package (LB). The suffix difference is primarily ordering and packing: the A3959SLBTR-T is supplied in tape and reel, while the A3959SLB-T is supplied in a tube. Both are specified over the industrial temperature range and share the same electrical ratings and functional characteristics.
Are the A3959SLBTR-T and A3959SLB-T electrically identical?
Yes. Both part numbers refer to the same A3959 die and package type, so the electrical specifications, pinout, and functional operation are identical. The difference is the shipping media and orderable part number, not the device itself.
Can the A3959SLBTR-T and A3959SLB-T be used interchangeably in a design?
Yes, from an electrical and footprint standpoint they are interchangeable because they are the same device in the same 16-pin SOIC-W package. The only practical difference is the packaging format, so board-level assembly is unaffected as long as the correct reel or tube format is available for the production line.
What package do the A3959SLBTR-T and A3959SLB-T use?
Both devices use the Allegro LB package, a 16-pin SOIC-W (wide-body) surface-mount package. The package designation "LB" appears in both orderable part numbers and is consistent with the A3959 datasheet.
What is the function of the A3959SLBTR-T and A3959SLB-T?
The A3959 is a DMOS full-bridge motor driver designed to drive one DC motor or one bipolar stepper motor winding. It includes internal fixed off-time PWM current control, synchronous rectification, and protection features such as thermal shutdown and crossover-current protection, as documented in the Allegro A3959 datasheet.
Which part number should be ordered for tape-and-reel assembly?
The A3959SLBTR-T is the tape-and-reel orderable variant. The A3959SLB-T is the tube-packaged variant. For automated pick-and-place production, the A3959SLBTR-T is the appropriate choice when tape and reel is required.
Do the A3959SLBTR-T and A3959SLB-T have the same operating temperature range?
Yes. Both are the same A3959 device in the same LB package and are specified over the same industrial temperature range as stated in the Allegro A3959 datasheet. The packaging suffix does not change the temperature rating.