The A3977SLPTR is a microstepping DMOS motor driver designed for bipolar stepper motors, capable of operating in full-, half-, quarter-, and eighth-step modes. It supports an output drive of ¬±2.5 A and a maximum load supply voltage of 35 V. The device features low on-resistance outputs, with typical values of 0.28 ,Ѷ for sourcing and 0.22 ,Ѷ for sinking current, which contributes to efficient operation. This driver includes a built-in translator that simplifies motor control by allowing a single pulse on the STEP input to advance the motor by one step, eliminating the need for complex phase-sequence tables or high-frequency control lines. The A3977 also incorporates automatic current decay mode detection, offering mixed, fast, and slow decay modes to enhance motor performance by reducing noise and improving step accuracy. Protection features include undervoltage lockout (UVLO), thermal shutdown, and crossover-current protection, ensuring reliable operation under various conditions. The A3977SLPTR is packaged in a 28-pin TSSOP with an exposed thermal pad, suitable for applications requiring compact design and efficient thermal management. The operating temperature range is from -20 to 85 ¬8C, making it versatile for different environments.
Manufacturer: Allegro MicroSystems, LLC
Win Source Part Number: 845144-A3977SLPTR
Features: Motor Driver
Package: Reel - TR
Part Status: Obsolete
Family Name: A3977
Categories: Integrated Circuits (ICs)
ECCN: EAR99
Popularity: Medium
Fake Threat In the Open Market: 77 pct.
Supply and Demand Status: Limited
Quantity per package: 4000
MSL Level: 1 (Unlimited)
REACH Status: REACH Unaffected
HTSUS: 8542.39.0001
Stepper Motor Controller, 2.5A, NMOS, PDSO28, EXPOSED PAD, TSSOP-28 Product overview: A3977SLPTR from Allegro MicroSystems is a Motor Driver IC for embedded motor control, robotics, automation equipment, haptic feedback, pumps, fans, and industrial motion systems. It is useful for engineers and buyers comparing datasheets, replacement parts, BOM lines, package options, lifecycle status, and procurement availability. Key searchable attributes include Stepper, 2.5A, TSSOP. Search-friendly keywords include motor driver IC, H-bridge, stepper motor, PWM control, motion control, Stepper, 2.5A, TSSOP, Motor Drivers, Controllers. This listing supports clearer product discovery for industrial, commercial, repair, automation, power, sensing, and embedded system projects. Product number 744-A3977SLPTR can be used for catalog matching and distributor lookup.
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| Win Source Electronics | ERSAELECTRONICS PTE. LTD. | DigiKey | Shenzhen Shengyu Electronics Technology Limited | Lingto Electronic Limited | Quarktwin Technology Ltd. | |
|---|---|---|---|---|---|---|
| Product Category | Motion Controllers | DC Motor Drives | DC Motor Drives | Motor Controllers | Motor Controllers | Motor Controllers |
| Product Number | 845144-A3977SLPTR | 744-A3977SLPTR | A3977SLPTR-ND | A3977SLPTR | A3977SLPTR | A3977SLPTR |
| Product Name | PMIC - PMIC - Motor Drivers, Controllers - A3977SLPTR | Stepper 2.5A TSSOP Motor Driver IC | Motor Drivers, Controllers | Integrated Circuits (ICs) - Power Management (PMIC) - Motor Drivers, Controllers | PMIC - Motor Drivers, Controllers | Motor Drivers, Controllers |
| PC-Based Bus | Logic | |||||
| Operating Temperature | -20 C (-4 F) | -20 to 150 C (-4 to 302 F) | -20 to 150 C (-4 to 302 F) | |||
| DC Input | 6 volts | 3 to 6 volts | ||||
| Configuration | PCB Mount; "28-TSSOP (0.173"", 4.40mm Width) Exposed Pad" | |||||
| Communication | Logic | Logic |
