A3967SLB Equivalent & Substitute Parts

Part Overview

The A3967SLB is a bipolar stepper motor driver IC manufactured by Allegro MicroSystems, designed for integrated motor control and power stage applications. This device operates across a 3V to 5.5V supply range and supports multiple step resolutions (1, 1/2, 1/4, 1/8) for general-purpose motor driving applications. The A3967SLB is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

A3967SLB

Allegro MicroSystemsIn Stock: 1425A3967SLB Datasheet

Current PartRFQ

TB6560AHQ,8

Toshiba Semiconductor and StorageIn Stock: 1000362TB6560AHQ,8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3967SLB is determined by the following critical parameters:

Motor control function: Fully integrated bipolar stepper motor driver with control and power stage Output configuration: Half bridge topology with 4 output stages Step resolution capability: Support for 1, 1/2, 1/4, and 1/8 step modes Supply voltage range: Minimum 3V to 5.5V operation Load voltage range: 4.75V to 30V capability Output current: 750mA per phase Mounting and packaging: Surface mount in 24-pin SOIC package

The TB6560AHQ,8 qualifies as a substitute based on matching motor driver function, half-bridge output configuration, and step resolution support. However, differences in supply voltage range, output current capability, mounting type, and package style introduce design considerations that must be evaluated for specific applications.

Parameter Comparison

Engineering Selection Recommendations

The TB6560AHQ,8 is an active product with ROHS3 compliance, addressing the obsolescence and regulatory status limitations of the A3967SLB. The substitute offers enhanced specifications including higher output current (3A versus 750mA), extended load voltage range (4.5V ~ 34V), and additional step resolution (1/16 mode).

Design integration requires consideration of the following differences:

Supply voltage: The TB6560AHQ,8 operates at 4.5V minimum, eliminating compatibility with 3V-only applications supported by the A3967SLB.

Output current: The 3A capability of the TB6560AHQ,8 exceeds the 750mA specification of the A3967SLB, suitable for higher-torque motor applications.

Mounting and package: Transition from surface mount 24-SOIC to through-hole 25-SSIP requires PCB redesign.

Operating temperature: The A3967SLB supports higher junction temperatures (-20°C ~ 150°C TJ) compared to the TB6560AHQ,8 ambient range (-30°C ~ 85°C TA), relevant for high-temperature environments.

Technology: The TB6560AHQ,8 uses Power MOSFET technology versus the bipolar technology of the A3967SLB, affecting switching characteristics and thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the TB6560AHQ,8 directly replace the A3967SLB in existing designs?

A: Direct replacement requires PCB modification due to different mounting types (surface mount versus through-hole) and package styles (24-SOIC versus 25-SSIP). Supply voltage compatibility must be verified; applications requiring 3V operation are not supported by the TB6560AHQ,8.

Q: What are the key compatibility criteria for bipolar stepper motor driver substitution?

A: Critical parameters include motor type (bipolar stepper), output configuration (half-bridge with 4 stages), step resolution support, supply voltage range, load voltage range, and output current capability. The substitute must support the same or higher current and voltage specifications required by the motor application.

Q: How does the technology difference (Bipolar versus Power MOSFET) affect substitution?

A: Bipolar technology and Power MOSFET technology exhibit different switching speeds, thermal characteristics, and drive requirements. The TB6560AHQ,8 Power MOSFET design typically offers lower on-resistance and improved efficiency compared to bipolar technology, but requires verification of control signal compatibility and thermal management in the target application.

Q: Is the TB6560AHQ,8 suitable for applications requiring 3V supply operation?

A: No. The TB6560AHQ,8 minimum supply voltage is 4.5V, making it incompatible with 3V-only applications. The A3967SLB supports 3V ~ 5.5V operation. Alternative substitutes must be evaluated for 3V applications.

Q: What compliance advantages does the TB6560AHQ,8 offer over the A3967SLB?

A: The TB6560AHQ,8 is ROHS3 compliant and carries active product status, addressing regulatory requirements and long-term availability concerns associated with the obsolete, RoHS non-compliant A3967SLB.

Q: How do the output current specifications compare?

A: The A3967SLB provides 750mA output current per phase, while the TB6560AHQ,8 delivers 3A. The higher current capability of the substitute supports higher-torque stepper motors or multiple motor phases with greater power delivery.