Part A
A3959SLBTR-T
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 6213 PCS
- Package
- SOIC-24
- Series
- PMIC - Motor Drivers, Controllers
Replacement verdict
Compatible functional replacement candidate
The A3959SLBTR-T and A3959SLB are functionally equivalent DMOS full-bridge motor drivers from Allegro MicroSystems, sharing identical silicon design, electrical ratings, and operational characteristics. The only distinction is the packing format, with the SLBTR-T variant supplied in tape and reel for automated assembly while the SLB variant is provided in tube packaging. Both devices are drop-in replacements for one another in terms of electrical performance and footprint, making either part suitable for the same application provided the assembly process accommodates the respective packaging.
Package Type
High match
Output Current Rating
High match
Supply Voltage Range
High match
Operating Temperature Range
High match
Parts at a glance
Part B
A3959SLB
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 7908 PCS
- Package
- SOIC-24
- 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 | A3959SLBTR-T | A3959SLB | Why it matters |
|---|---|---|---|
| Manufacturer | Allegro MicroSystems | Allegro MicroSystems | Identical manufacturer ensures the same design, process, and quality standards, which is essential for functional substitutability. |
| Motor Type | Brushless DC (BLDC) | Brushless DC (BLDC) | Both parts must drive the same motor type to be interchangeable in a given application. |
| Supply Voltage Range | 4.5 V to 50 V | 4.5 V to 50 V | Matching voltage ranges ensure the device can operate in the same power supply environment without modification. |
| Output Current (Continuous) | 2.5 A | 2.5 A | Identical current rating means the parts can drive the same load without thermal or reliability differences. |
| Package / Case | 16-PowerSOIC (0.295", 7.50mm Width) | 16-PowerSOIC (0.295", 7.50mm Width) | Same package footprint allows direct PCB drop-in replacement without layout changes. |
| Mounting Type | Surface Mount | Surface Mount | Both are surface mount, but the tape-and-reel variant (TR) is optimized for automated assembly, while the tube variant may require different handling. |
| Packaging | Tape & Reel (TR) | Tube | Packaging affects manufacturing logistics; tape and reel is for high-volume automated pick-and-place, while tubes are for manual or low-volume assembly. |
| Operating Temperature Range | -20°C to 85°C | -20°C to 85°C | Identical temperature range ensures both parts perform reliably in the same thermal environment. |
| RoHS Compliance | Compliant | Compliant | Both meet RoHS, which is required for sale in many regions and ensures environmental regulatory compliance. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | A3959SLBTR-T | A3959SLB |
|---|---|---|
| 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?
The A3959SLBTR-T is the tape and reel packaged version of the A3959SLB. Both devices are the same Allegro MicroSystems A3959 DMOS full-bridge motor driver die in the same 16-pin SOICW (LB) package; the "-TR" suffix designates tape and reel packing, while the base A3959SLB part number denotes the same device supplied in tube or bulk packing.
Are the A3959SLBTR-T and A3959SLB electrically and functionally identical?
Yes. Because both part numbers refer to the same A3959 device in the same LB (16-pin SOICW) package, the electrical specifications, functional behavior, pinout, and thermal characteristics are identical. The only documented difference is the shipping/packaging format indicated by the TR suffix.
Can the A3959SLBTR-T and A3959SLB be used interchangeably in a design?
Yes, from an electrical and mechanical standpoint they are interchangeable, since they are the same device in the same package. The choice between them is typically driven by assembly requirements: A3959SLBTR-T is intended for automated pick-and-place tape-and-reel assembly, while A3959SLB is supplied in tube/bulk form.
What is the function of the A3959 device?
The A3959 is a DMOS full-bridge motor driver designed to drive inductive loads such as DC motors and stepper motor windings. It integrates a full H-bridge output stage with internal current-control PWM circuitry, allowing bidirectional control of a motor with a single supply.
What package do the A3959SLBTR-T and A3959SLB use?
Both part numbers use the Allegro "LB" package, which is a 16-pin SOICW (wide-body SOIC) surface-mount package. The "LB" code in the part number identifies this package, and the "TR" suffix in A3959SLBTR-T indicates tape-and-reel packing of that same package.
Does the A3959SLBTR-T have a different operating temperature range than the A3959SLB?
No. Since both part numbers refer to the same A3959SLB device, they share the same specified operating temperature range for the LB package. The TR suffix affects only the packing format and does not change the temperature rating.
Which part number should be ordered for automated production assembly?
A3959SLBTR-T should be selected for automated surface-mount assembly because the "-TR" suffix specifies tape-and-reel packaging, which is compatible with pick-and-place equipment. A3959SLB in tube/bulk form is generally used for manual assembly, prototyping, or low-volume runs.