A3966SLBTR Equivalent & Substitute Parts

Part Overview

The A3966SLBTR is a bipolar motor driver IC manufactured by Allegro MicroSystems, designed for stepper motor control applications. It integrates control and power stage functionality in a 16-SOIC package with a supply voltage range of 4.75V to 5.5V and output current capability of 650mA. The device is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer	Allegro MicroSystems
Category	Power Management (PMIC)
Motor Type - Stepper	Bipolar
Function	Driver - Fully Integrated, Control and Power Stage
Output Configuration	Half Bridge (4)
Interface	Parallel
Technology	Bipolar
Current - Output	650mA
Voltage - Supply	4.75V ~ 5.5V
Voltage - Load	4.75V ~ 30V
Operating Temperature	-20°C ~ 150°C (TJ)
Mounting Type	Surface Mount
Package / Case	16-PowerSOIC (0.295", 7.50mm Width)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitute parts for the A3966SLBTR are identified based on the following critical parameters that determine functional compatibility:

Motor Type: Bipolar stepper motor driver capability
Output Configuration: Half Bridge (4) topology
Interface: Parallel control interface
Function: Fully integrated control and power stage
Mounting Type: Surface mount technology
Core electrical specifications: Supply voltage, output current, load voltage, and operating temperature ranges

Two substitute parts are identified:

A3966SLBTR-T (Parametric Equivalent): Identical electrical and functional specifications with different packaging and product status
LV8734VL-TLM-H (Manufacturer Recommended): Alternative from onsemi with enhanced specifications and broader application support

Parameter Comparison

Parameter	A3966SLBTR	A3966SLBTR-T	LV8734VL-TLM-H
Manufacturer	Allegro MicroSystems	Allegro MicroSystems	onsemi
Motor Type - Stepper	Bipolar	Bipolar	Bipolar
Function	Driver - Fully Integrated, Control and Power Stage	Driver - Fully Integrated, Control and Power Stage	Driver - Fully Integrated, Control and Power Stage
Output Configuration	Half Bridge (4)	Half Bridge (4)	Half Bridge (4)
Interface	Parallel	Parallel	Parallel
Technology	Bipolar	Bipolar	BiCDMOS
Current - Output	650mA	650mA	1.5A
Voltage - Supply	4.75V ~ 5.5V	4.75V ~ 5.5V	0V ~ 5.5V
Voltage - Load	4.75V ~ 30V	4.75V ~ 30V	9V ~ 32V
Operating Temperature	-20°C ~ 150°C (TJ)	-20°C ~ 150°C (TJ)	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	16-PowerSOIC (0.295", 7.50mm Width)	16-PowerSOIC (0.295", 7.50mm Width)	44-LSSOP (0.220", 5.60mm Width) Exposed Pad
Product Status	Obsolete	Active	Active
RoHS Status	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)

Engineering Selection Recommendations

A3966SLBTR-T is the direct parametric equivalent to the obsolete A3966SLBTR. Both devices share identical electrical specifications, functional architecture, and package form factor. The primary distinction is product status: A3966SLBTR-T is active and available in higher inventory quantities (18,437 pcs vs. 1,393 pcs). A3966SLBTR-T achieves ROHS3 compliance and carries MSL-3 rating, representing improved environmental and regulatory alignment compared to the original part.

LV8734VL-TLM-H from onsemi is a manufacturer-recommended alternative that maintains core functional compatibility while introducing enhanced specifications. This device provides higher output current (1.5A vs. 650mA), extended supply voltage range (0V to 5.5V), and broader operating temperature range (-40°C to 85°C). The LV8734VL-TLM-H utilizes BiCDMOS technology and includes step resolution capability (1, 1/4, 1/8) not specified in the A3966SLBTR. The package differs (44-LSSOP vs. 16-PowerSOIC), requiring PCB layout modification. Both substitute parts are ROHS3 compliant and REACH unaffected.

For applications requiring direct form-factor and footprint compatibility, A3966SLBTR-T is the appropriate selection. For applications where enhanced current capability and extended operating range provide design margin, LV8734VL-TLM-H is suitable with PCB redesign.

Frequently Asked Questions (FAQ)

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

A: Yes. A3966SLBTR-T is electrically and functionally identical to A3966SLBTR. Both devices operate with 4.75V to 5.5V supply voltage, deliver 650mA output current, and use the same 16-PowerSOIC package. No circuit modifications are required.

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

A: The primary differences are output current (650mA vs. 1.5A), supply voltage range (4.75-5.5V vs. 0-5.5V), package type (16-PowerSOIC vs. 44-LSSOP), and technology platform (Bipolar vs. BiCDMOS). LV8734VL-TLM-H requires PCB redesign due to different package footprint.

Q: Is the A3966SLBTR still available for purchase?

A: A3966SLBTR is classified as obsolete. Current inventory is limited to 1,393 pcs. A3966SLBTR-T is the active equivalent with significantly higher availability (18,437 pcs).

Q: What is the impact of different package types on PCB design?

A: A3966SLBTR and A3966SLBTR-T both use 16-PowerSOIC packages with identical footprints, allowing direct PCB substitution. LV8734VL-TLM-H uses 44-LSSOP package, requiring new PCB layout and routing.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both A3966SLBTR-T and LV8734VL-TLM-H are ROHS3 compliant. The original A3966SLBTR is RoHS non-compliant.

Q: What is the moisture sensitivity difference between the parts?

A: A3966SLBTR carries MSL-1 (unlimited shelf life). A3966SLBTR-T and LV8734VL-TLM-H carry MSL-3 (168-hour floor life after moisture exposure). This affects storage and handling procedures.

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