A3964SLB-T Equivalent & Substitute Parts

Part Overview

The A3964SLB-T is a bipolar motor driver IC manufactured by Allegro MicroSystems, designed for fully integrated motor control applications with both control and power stage functionality. This device operates as a half-bridge driver with parallel interface control, supporting general-purpose motor driving applications. The product is currently classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements.

Substiute Parts

A3964SLB-T

Allegro MicroSystemsIn Stock: 3831A3964SLB-T Datasheet

Current PartRFQ

LV8734VL-TLM-H

onsemiIn Stock: 1095LV8734VL-TLM-H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3964SLB-T is determined by the following critical parameters:

Motor driver functionality requires matching of motor type (bipolar stepper motor support), output configuration (half-bridge with 4 outputs), and control interface (parallel). The substitute part must support fully integrated control and power stage operation for general-purpose motor driving applications.

Electrical compatibility is established through output current capability (minimum 800mA), supply voltage range (must accommodate 4.75V ~ 5.25V operation), and load voltage range (5V ~ 30V). Operating temperature range and technology platform (bipolar or compatible alternative) determine thermal and performance characteristics.

Physical compatibility requires surface mount technology with package dimensions suitable for PCB integration. Compliance certifications (RoHS3, REACH Unaffected, EAR99) ensure regulatory alignment for production and distribution.

The LV8734VL-TLM-H qualifies as a substitute based on these parameters: it maintains bipolar motor driver functionality with half-bridge output configuration, parallel interface control, fully integrated driver architecture, and exceeds the minimum output current specification (1.5A vs. 800mA requirement). Supply voltage range (0V ~ 5.5V) encompasses the required 4.75V ~ 5.25V operation window, and load voltage range (9V ~ 32V) covers the 5V ~ 30V requirement. Surface mount packaging and RoHS3 compliance maintain regulatory and manufacturing compatibility.

Parameter Comparison

Engineering Selection Recommendations

The LV8734VL-TLM-H is an active product from onsemi with current manufacturing and supply availability, addressing the obsolescence status of the A3964SLB-T. Both devices maintain RoHS3 compliance and REACH unaffected status, ensuring regulatory continuity for production environments.

The substitute part exceeds the electrical specifications of the original device: output current capability increases from 800mA to 1.5A, and supply voltage range expands to accommodate broader input conditions. Load voltage range extension (9V ~ 32V vs. 5V ~ 30V) provides additional operational flexibility.

Package transition from 20-SOIC to 44-LSSOP requires PCB layout modification and pin-to-pin signal mapping verification. The LV8734VL-TLM-H includes step resolution capability (1, 1/4, 1/8) not specified in the A3964SLB-T, offering enhanced motor control precision for stepper motor applications.

Operating temperature range differs: the A3964SLB-T specifies junction temperature to 150°C, while the LV8734VL-TLM-H specifies ambient temperature to 85°C. Application thermal environment assessment is required to confirm compatibility.

Frequently Asked Questions (FAQ)

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

A: No. The package change from 20-SOIC to 44-LSSOP requires PCB layout redesign. Pin assignments must be verified against both datasheets, and signal routing must be reconfigured for the new package footprint.

Q: What are the key electrical differences between these devices?

A: The LV8734VL-TLM-H provides higher output current (1.5A vs. 800mA), expanded supply voltage range (0V ~ 5.5V vs. 4.75V ~ 5.25V), and extended load voltage range (9V ~ 32V vs. 5V ~ 30V). Both maintain half-bridge output configuration and parallel interface control.

Q: Are both devices RoHS3 compliant?

A: Yes. Both the A3964SLB-T and LV8734VL-TLM-H are RoHS3 compliant and REACH unaffected, maintaining regulatory alignment for production and distribution.

Q: What is the impact of the operating temperature range difference?

A: The A3964SLB-T operates to 150°C junction temperature, while the LV8734VL-TLM-H operates to 85°C ambient temperature. Applications requiring sustained high-temperature operation must evaluate thermal management and derating requirements for the substitute part.

Q: Does the LV8734VL-TLM-H support the same motor types as the A3964SLB-T?

A: Both devices support bipolar stepper motors. The LV8734VL-TLM-H additionally supports brushed DC motors and offers step resolution options (1, 1/2, 1/4, 1/8) for enhanced stepper motor control precision.

Q: What is the moisture sensitivity level difference?

A: The A3964SLB-T has MSL 1 (unlimited), while the LV8734VL-TLM-H has MSL 3 (168 hours). Storage and handling procedures must comply with the more restrictive MSL 3 specification for the substitute part.