A3964SB Equivalent & Substitute Parts

Part Overview

The A3964SB is a bipolar motor driver IC manufactured by Allegro MicroSystems, designed for fully integrated control and power stage applications in stepper motor systems. This 24-DIP through-hole component operates within a 4.75V to 5.25V supply voltage range and delivers 800mA output current across four half-bridge configurations. The A3964SB is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and new design implementations.

Substiute Parts

A3964SB

Allegro MicroSystemsIn Stock: 1623A3964SB Datasheet

Current PartRFQ

LV8734VL-TLM-H

onsemiIn Stock: 1095LV8734VL-TLM-H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3964SB is determined by the following critical parameters:

• Motor Driver Type: Bipolar stepper motor driver capability with fully integrated control and power stage
• Output Configuration: Four half-bridge outputs for bipolar motor phase control
• Interface Type: Parallel control interface
• Current Capacity: Minimum 800mA output current requirement
• Supply Voltage Compatibility: Operating range that accommodates the original 4.75V to 5.25V specification
• Load Voltage Range: Support for 5V to 30V load voltage operation
• Functional Integration: Complete driver integration including control logic and power output stages

The LV8734VL-TLM-H from onsemi meets these substitution criteria through equivalent bipolar motor driver architecture, four half-bridge output configuration, parallel interface, and integrated control and power stage design. While packaging and some electrical specifications differ, the functional equivalence enables direct substitution in applications where the original A3964SB is no longer available.

Parameter Comparison

Engineering Selection Recommendations

The LV8734VL-TLM-H serves as a functional equivalent for A3964SB applications based on the following engineering criteria:

Functional Equivalence: Both devices provide bipolar stepper motor driver functionality with four half-bridge outputs and parallel control interface, meeting the core application requirements.

Performance Advantages: The LV8734VL-TLM-H offers increased output current capacity (1.5A versus 800mA) and extended supply voltage range (0V to 5.5V), providing design margin for applications operating at the original specification limits.

Compliance Status: The LV8734VL-TLM-H is ROHS3 compliant and carries active product status, whereas the A3964SB is obsolete and RoHS non-compliant. Selection of the LV8734VL-TLM-H aligns with current regulatory requirements and ensures long-term component availability.

Implementation Considerations: Substitution requires PCB redesign due to different mounting technology (surface mount versus through hole) and package form factor (44-LSSOP versus 24-PowerDIP). Pin configuration and control signal mapping must be verified against device datasheets prior to implementation.

Temperature Operating Range: The LV8734VL-TLM-H operates to 85°C ambient temperature, which may be limiting for applications requiring the original -20°C to 150°C junction temperature range. Thermal analysis is required for high-temperature applications.

Frequently Asked Questions (FAQ)

Q: Can the LV8734VL-TLM-H directly replace the A3964SB without PCB modification?

A: No. The LV8734VL-TLM-H uses surface mount packaging (44-LSSOP) while the A3964SB uses through-hole packaging (24-PowerDIP). PCB redesign is required. Pin assignments and control signal routing must be verified against both device datasheets.

Q: What are the key functional similarities between these devices?

A: Both devices are bipolar stepper motor drivers with four half-bridge output configurations, parallel control interfaces, and fully integrated control and power stages. Both support general-purpose motor driver applications.

Q: Does the LV8734VL-TLM-H support the same supply voltage range as the A3964SB?

A: The LV8734VL-TLM-H supply range (0V to 5.5V) encompasses the A3964SB range (4.75V to 5.25V). The substitute device operates across a wider voltage window, providing additional design flexibility.

Q: Are there output current differences between these devices?

A: Yes. The LV8734VL-TLM-H provides 1.5A output current compared to the A3964SB's 800mA. This increased capacity allows the substitute to handle higher motor current demands without derating.

Q: What is the load voltage compatibility between these devices?

A: The A3964SB supports 5V to 30V load voltage, while the LV8734VL-TLM-H supports 9V to 32V. Applications operating between 5V and 9V load voltage require verification that the LV8734VL-TLM-H meets minimum load voltage requirements.

Q: How do the operating temperature ranges compare?

A: The A3964SB operates from -20°C to 150°C junction temperature, while the LV8734VL-TLM-H operates from -40°C to 85°C ambient temperature. These use different measurement points. Applications requiring operation above 85°C ambient may not be suitable for the LV8734VL-TLM-H.

Q: What compliance advantages does the LV8734VL-TLM-H offer?

A: The LV8734VL-TLM-H is ROHS3 compliant with active product status, ensuring regulatory alignment and long-term availability. The A3964SB is RoHS non-compliant and obsolete.

Q: Are there step resolution differences?

A: The LV8734VL-TLM-H supports step resolution options (1, 1/2, 1/4, 1/8), while the A3964SB step resolution is not specified in the provided parameters. Verify step resolution requirements against application specifications.