A3966SLB-T Equivalent & Substitute Parts

Part Overview

The A3966SLB-T is a bipolar motor driver IC manufactured by Allegro MicroSystems, designed for fully integrated control and power stage applications in stepper motor systems. This device operates within a 4.75V to 5.5V supply voltage range and delivers 650mA output current across four half-bridge configurations. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

A3966SLB-T

Allegro MicroSystemsIn Stock: 15774A3966SLB-T Datasheet

Current PartRFQ

A3966SLBTR-T

Allegro MicroSystemsIn Stock: 18503A3966SLBTR-T Datasheet

MFR RecommendedRFQ

LV8734VL-TLM-H

onsemiIn Stock: 1095LV8734VL-TLM-H Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the A3966SLB-T is determined by the following critical parameters:

• Motor driver function with fully integrated control and power stage capability
• Bipolar motor type support
• Four half-bridge output configuration
• Parallel interface architecture
• Output current rating of 650mA or greater
• Supply voltage compatibility within or overlapping the 4.75V to 5.5V range
• Load voltage range spanning 4.75V to 30V minimum
• Surface mount packaging suitable for PCB integration

Two substitute parts meet these criteria with varying degrees of parameter alignment and product status considerations.

Parameter Comparison

Engineering Selection Recommendations

A3966SLBTR-T is the primary substitute for A3966SLB-T. Both parts share identical electrical specifications, including supply voltage range, output current, load voltage range, and operating temperature. The A3966SLBTR-T maintains the same 16-PowerSOIC package footprint, enabling direct PCB replacement without layout modifications. The critical distinction is product status: A3966SLBTR-T is active and currently in production, whereas A3966SLB-T is obsolete. This part is recommended for new designs and production continuity where existing inventory of the original part is depleted.

LV8734VL-TLM-H is a secondary substitute with functional equivalence but notable parameter differences. This onsemi device supports bipolar stepper motor control with four half-bridge outputs and parallel interface, matching the core functional requirements. However, the LV8734VL-TLM-H operates across a wider supply voltage range (0V to 5.5V) and delivers higher output current (1.5A versus 650mA). The load voltage range extends to 32V, providing greater flexibility. The package changes from 16-PowerSOIC to 44-LSSOP, requiring PCB redesign. Operating temperature range is narrower (-40°C to 85°C ambient versus -20°C to 150°C junction). This substitute is suitable for applications where higher current capability or extended load voltage range is beneficial and PCB layout modification is feasible.

Frequently Asked Questions (FAQ)

Q: Can A3966SLBTR-T be used as a direct replacement for A3966SLB-T?

A: Yes. Both parts are electrically and mechanically identical. The A3966SLBTR-T uses the same 16-PowerSOIC package, supply voltage range (4.75V to 5.5V), output current (650mA), load voltage range (4.75V to 30V), and operating temperature range (-20°C to 150°C). No circuit modifications or PCB layout changes are required.

Q: What are the key differences between A3966SLBTR-T and LV8734VL-TLM-H?

A: The primary differences are output current (650mA versus 1.5A), package type (16-PowerSOIC versus 44-LSSOP), supply voltage range (4.75V-5.5V versus 0V-5.5V), load voltage range (4.75V-30V versus 9V-32V), and operating temperature (junction -20°C to 150°C versus ambient -40°C to 85°C). The LV8734VL-TLM-H offers higher current capability and wider voltage flexibility but requires PCB redesign due to package change.

Q: Is package compatibility a concern when substituting these parts?

A: Package compatibility depends on the substitute selected. A3966SLBTR-T maintains the 16-PowerSOIC footprint and is a direct PCB replacement. LV8734VL-TLM-H uses a 44-LSSOP package, which is physically and electrically different, requiring PCB layout modification and potential schematic adjustments for proper signal routing.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. A3966SLB-T, A3966SLBTR-T, and LV8734VL-TLM-H are all ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing and use.

Q: Which substitute should be selected for new production designs?

A: A3966SLBTR-T is the recommended choice for new designs requiring direct compatibility with existing A3966SLB-T circuits. It is active in production and provides identical electrical and mechanical specifications. LV8734VL-TLM-H should be considered only if higher output current or extended voltage ranges are required and PCB redesign is acceptable.