A3964SLBTR-T Equivalent & Substitute Parts

Part Overview

The A3964SLBTR-T is a bipolar motor driver IC manufactured by Allegro MicroSystems, classified as a Power Management (PMIC) component. This fully integrated driver provides both control and power stage functionality for bipolar stepper motors in general-purpose applications. The device is currently listed as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. Substitute parts must maintain functional equivalence through matching motor driver architecture, output configuration, and electrical operating parameters.

Substiute Parts

A3964SLBTR-T

Allegro MicroSystemsIn Stock: 5810A3964SLBTR-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

Substitute parts for the A3964SLBTR-T are identified based on the following critical parameters that define functional equivalence:

• Motor driver type: Bipolar stepper motor driver with fully integrated control and power stage
• Output configuration: Half Bridge (4) topology
• Interface type: Parallel control interface
• Supply voltage range: Minimum 4.75V support
• Load voltage range: Minimum 5V support
• Output current capability: Minimum 650mA
• Operating temperature range: Minimum -20°C to 150°C junction temperature
• Mounting type: Surface mount
• RoHS3 compliance: Required

The A3964SLBTR-T has two identified substitutes that meet these criteria with varying trade-offs in package size, current rating, and temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

A3966SLBTR-T (Allegro MicroSystems)

The A3966SLBTR-T is the primary substitute from the same manufacturer family. It maintains identical motor driver architecture, output configuration, and operating temperature range as the A3964SLBTR-T. The device is currently in active production status, ensuring long-term availability. The output current is reduced to 650mA compared to the original 800mA specification. The package transitions from 20-SOIC to 16-PowerSOIC, both maintaining the same 7.50mm width for PCB layout compatibility. Supply voltage range extends to 5.5V, and load voltage minimum decreases to 4.75V, providing broader operational flexibility. Moisture sensitivity increases from MSL 1 to MSL 3, requiring controlled storage conditions during manufacturing.

LV8734VL-TLM-H (onsemi)

The LV8734VL-TLM-H represents a cross-manufacturer substitute with enhanced current capability at 1.5A, exceeding the original 800mA specification. This device supports both bipolar stepper and brushed DC motor applications. The package format changes to 44-LSSOP with exposed pad, requiring PCB redesign for integration. Operating temperature range is reduced to -40°C to 85°C ambient temperature (versus junction temperature specification of the original part), which may impact high-temperature applications. Supply voltage range expands to 0V minimum, and load voltage range extends to 32V maximum. The device is in active production status with ROHS3 compliance. Moisture sensitivity is MSL 3.

Both substitutes are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part.

Frequently Asked Questions (FAQ)

Q: Can the A3966SLBTR-T directly replace the A3964SLBTR-T without PCB modifications?

A: The A3966SLBTR-T uses a 16-PowerSOIC package versus the original 20-SOIC package. While both maintain 7.50mm width, the pin count and pinout differ, requiring PCB layout changes. Verify pinout compatibility before implementation.

Q: What is the impact of reduced output current in the A3966SLBTR-T?

A: The A3966SLBTR-T provides 650mA output current compared to the original 800mA. This reduction is suitable for stepper motors with lower current requirements. Applications requiring the full 800mA specification should evaluate the LV8734VL-TLM-H or source remaining A3964SLBTR-T inventory.

Q: Does the LV8734VL-TLM-H require significant design changes?

A: Yes. The LV8734VL-TLM-H uses a 44-LSSOP package with exposed pad, substantially different from the original 20-SOIC package. This requires complete PCB redesign, including signal routing and thermal management considerations. The package change also affects board space requirements.

Q: Are there temperature specification differences between substitutes?

A: The A3964SLBTR-T and A3966SLBTR-T specify junction temperature (TJ) operating range of -20°C to 150°C. The LV8734VL-TLM-H specifies ambient temperature (TA) range of -40°C to 85°C. These are different measurement points; direct comparison requires thermal analysis of your specific application.

Q: What is the significance of MSL rating changes?

A: The original A3964SLBTR-T has MSL 1 (unlimited shelf life). Both substitutes have MSL 3 (168-hour floor life after moisture exposure). Manufacturing processes must implement moisture control procedures, including baking and dry storage, to maintain component reliability.

Q: Can the LV8734VL-TLM-H support brushed DC motor applications?

A: Yes, the LV8734VL-TLM-H supports both bipolar stepper and brushed DC motor types. The A3964SLBTR-T and A3966SLBTR-T are specified for bipolar stepper motors only. This expanded capability may enable additional application flexibility.

Q: What supply voltage range is safe for all three devices?

A: The overlapping safe supply voltage range is 4.75V to 5.25V, which is supported by all three devices. The A3966SLBTR-T extends to 5.5V, and the LV8734VL-TLM-H extends down to 0V, but 4.75V to 5.25V represents the common operating window.