A3964SLB Equivalent & Substitute Parts

Part Overview

The A3964SLB is a bipolar motor driver IC manufactured by Allegro MicroSystems, designed for fully integrated motor control applications with integrated control and power stages. This device operates as a half-bridge driver with parallel interface capability, supporting bipolar stepper motors and general-purpose motor control applications.

The A3964SLB is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for systems utilizing this component.

Substiute Parts

A3964SLB

Allegro MicroSystemsIn Stock: 1514A3964SLB Datasheet

Current PartRFQ

LV8734VL-TLM-H

onsemiIn Stock: 1095LV8734VL-TLM-H Datasheet

MFR RecommendedRFQ

TB6562AFG,8,EL

Toshiba Semiconductor and StorageIn Stock: 10413TB6562AFG,8,EL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A3964SLB are selected based on the following critical parameters that determine functional compatibility:

Core Functional Requirements:

• Motor Type: Bipolar stepper motor support
• Output Configuration: Half Bridge (4) topology
• Interface: Parallel control interface
• Function: Fully integrated driver with control and power stages

Electrical Operating Range:

• Supply voltage compatibility within acceptable overlap
• Load voltage range supporting target applications
• Output current capability meeting or exceeding 800mA requirement
• Operating temperature range suitable for intended environment

Physical & Manufacturing Compliance:

• Surface mount technology
• RoHS compliance status for regulatory requirements
• Moisture sensitivity level appropriate for handling and storage

The substitute parts identified (LV8734VL-TLM-H and TB6562AFG,8,EL) meet the core functional requirements of bipolar motor driver operation with half-bridge output configuration and parallel interface. Both substitutes are active products with current manufacturing status and improved compliance profiles.

Parameter Comparison

Engineering Selection Recommendations

LV8734VL-TLM-H (onsemi): This substitute provides active product status with ROHS3 compliance, addressing regulatory requirements for new designs. The BiCDMOS technology offers enhanced performance with 1.5A output current capability. The supply voltage range (0V ~ 5.5V) encompasses the A3964SLB operating window. Load voltage range (9V ~ 32V) overlaps the original specification (5V ~ 30V). The 44-LSSOP package requires PCB layout modification compared to the 20-SOIC footprint. Operating temperature range (-40°C ~ 85°C) is narrower than the original device, which may be a constraint for high-temperature applications.

TB6562AFG,8,EL (Toshiba Semiconductor and Storage): This substitute provides active product status with ROHS3 compliance. The DMOS technology supports 1.5A output current. The supply voltage range (10V ~ 34V) does not overlap with the A3964SLB supply specification (4.75V ~ 5.25V), making this option suitable only for applications where the motor driver supply voltage can be adjusted to the 10V minimum. Load voltage range (10V ~ 34V) exceeds the original specification. The 30-BSOP package maintains the same width (7.50mm) as the original 20-SOIC, potentially reducing layout redesign effort. Operating temperature range (-20°C ~ 85°C) matches the lower bound of the original specification.

Frequently Asked Questions (FAQ)

Q: Can the LV8734VL-TLM-H directly replace the A3964SLB without circuit modifications?

A: The LV8734VL-TLM-H provides functional equivalence in motor driver operation (bipolar stepper, half-bridge output, parallel interface). However, the package change from 20-SOIC to 44-LSSOP requires PCB layout redesign. The supply voltage range (0V ~ 5.5V) is compatible with the original 4.75V ~ 5.25V specification. Detailed datasheet review is necessary to confirm pin-level compatibility and control signal requirements.

Q: Can the TB6562AFG,8,EL directly replace the A3964SLB without circuit modifications?

A: The TB6562AFG,8,EL provides functional equivalence in motor driver operation. The critical limitation is the supply voltage range (10V ~ 34V), which does not overlap with the A3964SLB supply specification (4.75V ~ 5.25V). This substitute is applicable only if the circuit design can accommodate a minimum 10V supply voltage. The 30-BSOP package maintains similar width to the original 20-SOIC, potentially reducing layout redesign scope.

Q: What are the key differences in output current capability?

A: The A3964SLB provides 800mA output current. Both substitute parts (LV8734VL-TLM-H and TB6562AFG,8,EL) provide 1.5A output current, representing a 87.5% increase in current capability. This enhanced capability supports higher motor torque or allows operation with lower supply voltages for equivalent power delivery.

Q: How do the operating temperature ranges compare?

A: The A3964SLB operates from -20°C ~ 150°C (junction temperature). The LV8734VL-TLM-H operates from -40°C ~ 85°C (ambient temperature), providing lower temperature capability but reduced upper temperature limit. The TB6562AFG,8,EL operates from -20°C ~ 85°C (ambient temperature), matching the lower bound of the original specification. Applications requiring operation above 85°C ambient temperature cannot use either substitute without thermal management modifications.

Q: What is the impact of RoHS compliance status?

A: The A3964SLB is RoHS non-compliant. Both substitute parts (LV8734VL-TLM-H and TB6562AFG,8,EL) are ROHS3 compliant, meeting current regulatory requirements for electronic components in many jurisdictions. This compliance status is advantageous for new designs and systems subject to RoHS regulations.

Q: How does the package change affect PCB design?

A: The A3964SLB uses 20-SOIC packaging (0.295", 7.50mm width). The LV8734VL-TLM-H uses 44-LSSOP packaging (0.220", 5.60mm width), requiring complete PCB footprint redesign. The TB6562AFG,8,EL uses 30-BSOP packaging (0.295", 7.50mm width), maintaining the same width dimension as the original, potentially reducing layout redesign effort. Pin count and arrangement differ in both substitutes, necessitating detailed schematic and layout review.