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 A3959SLBTR are functionally equivalent DMOS full-bridge motor drivers from Allegro MicroSystems, sharing identical silicon design, electrical ratings, and package footprint. The only distinction is the "-T" suffix, which denotes tape-and-reel packaging orientation rather than any change in device performance or pinout. Both parts are drop-in interchangeable for design purposes, with the choice between them driven solely by assembly line packaging requirements.
Output Type
High match
Package Type
High match
Current Rating
High match
Operating Temperature
High match
Parts at a glance
Part B
A3959SLBTR
Allegro MicroSystems
- Lifecycle
- Active
- Stock
- 7152 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 | A3959SLBTR | 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 | Up to 3 A | Up to 3 A | Matching current rating ensures the replacement can drive the same load without derating. |
| Supply Voltage Range | 8 V to 40 V | 8 V to 40 V | Identical operating voltage window means the same system power rail can be used for either part. |
| Package / Case | 16-PowerTSSOP (0.173", 4.40mm Width) | 16-PowerTSSOP (0.173", 4.40mm Width) | Same footprint and pinout allow drop-in replacement without PCB redesign. |
| Mounting Type | Surface Mount | Surface Mount | Identical mounting method ensures compatibility with the same assembly process. |
| Operating Temperature | -40°C to 85°C | -40°C to 85°C | Same thermal range guarantees equivalent performance across the application's environmental conditions. |
| Interface | Parallel / PWM | Parallel / PWM | Matching control interface means the same microcontroller signals can drive either device. |
| RoHS Status | RoHS Compliant | RoHS Compliant | Both meet the same environmental compliance requirements for global markets. |
| Packaging | Tape & Reel | Tape & Reel | Same packaging format supports identical automated pick-and-place assembly lines. |
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Full specification comparison
Use manufacturer datasheets as the final authority.
| Specification | A3959SLBTR-T | A3959SLBTR |
|---|---|---|
| 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 A3959SLBTR?
The A3959SLBTR-T and A3959SLBTR are the same Allegro MicroSystems A3959 device in the same LB package. The "-T" suffix denotes tape-and-reel packing, while the base A3959SLBTR part number is also supplied in tape-and-reel form. Both share identical electrical specifications, package dimensions, and pinout.
Are the A3959SLBTR-T and A3959SLBTR electrically and functionally identical?
Yes. Both part numbers refer to the same A3959 DMOS full-bridge motor driver die in the same 24-lead SOIC (LB) package. They have the same supply voltage range, output current rating, logic interface, and internal protection features as specified in the Allegro A3959 datasheet.
Can the A3959SLBTR-T and A3959SLBTR be used interchangeably in a design?
Yes, because they are the same device with the same package, pinout, and electrical characteristics. Any design that accepts one will accept the other, provided the tape-and-reel orientation and quantity per reel meet the assembly requirements.
What is the function of the A3959SLBTR-T and A3959SLBTR?
Both are DMOS full-bridge motor drivers designed to drive one bipolar stepper motor or two DC motors. They include fixed off-time PWM current control, internal charge pump, and protection against crossover current, undervoltage, and thermal shutdown, as documented in the Allegro A3959 datasheet.
What package do the A3959SLBTR-T and A3959SLBTR use?
Both parts use the Allegro LB package, a 24-lead SOIC with a thermally enhanced batwing construction. The package is lead (Pb) free and RoHS compliant, with a 300 mil body width.
Do the A3959SLBTR-T and A3959SLBTR have the same operating temperature range?
Yes. Both are specified for operation over the industrial temperature range of -20°C to +85°C ambient, as stated in the Allegro A3959 datasheet.
What is the maximum output current for the A3959SLBTR-T and A3959SLBTR?
Both devices are rated for a continuous output current of ±1.5 A per bridge, with peak current up to ±2.5 A, subject to proper heatsinking and PCB thermal design as specified in the Allegro A3959 datasheet.
Are the A3959SLBTR-T and A3959SLBTR RoHS compliant?
Yes. Both part numbers are RoHS compliant and lead (Pb) free, as indicated by the "-T" suffix and Allegro's package marking conventions for the LB package.