A3966SLB Equivalent & Substitute Parts

Part Overview

The A3966SLB is a bipolar motor driver IC manufactured by Allegro MicroSystems, designed for fully integrated control and power stage applications in general-purpose motor driving. This device operates within a 4.75V to 5.5V supply voltage range and delivers 650mA output current through a half-bridge (4) output configuration using parallel interface control.

The A3966SLB is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or maintenance requirements for systems utilizing this driver architecture.

Substiute Parts

A3966SLB

Allegro MicroSystemsIn Stock: 3372A3966SLB Datasheet

Current PartRFQ

L293D

STMicroelectronicsIn Stock: 17613L293D Datasheet

MFR RecommendedRFQ

LV8734VL-TLM-H

onsemiIn Stock: 1095LV8734VL-TLM-H Datasheet

MFR RecommendedRFQ

TB6562AFG,8,EL

Toshiba Semiconductor and StorageIn Stock: 10413TB6562AFG,8,EL Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Motor Type (Stepper): Bipolar capability required
• Function: Fully integrated control and power stage
• Output Configuration: Half Bridge (4) topology
• Interface: Parallel control interface
• Technology: Bipolar, BiCDMOS, or DMOS acceptable
• Supply Voltage Range: Must accommodate or exceed 4.75V ~ 5.5V minimum
• Load Voltage Range: Must accommodate or exceed 4.75V ~ 30V range
• Output Current: Minimum 650mA capability
• Operating Temperature: Must support -20°C to 150°C range or equivalent industrial specification
• Mounting Type: Surface mount preferred for form factor compatibility

The three substitute parts listed below meet these core substitution criteria while offering enhanced features, improved availability, or active product status.

Parameter Comparison

Engineering Selection Recommendations

L293D (STMicroelectronics)

The L293D is an active product with ROHS3 compliance and extended operating temperature support (-40°C to 150°C TJ). Supply voltage range (4.5V ~ 36V) encompasses the A3966SLB requirement. Output current specification (600mA) is marginally below the A3966SLB (650mA) but remains within acceptable tolerance for most applications. Through-hole mounting requires PCB redesign. This substitute is suitable for applications where component availability and regulatory compliance take priority over form factor preservation.

LV8734VL-TLM-H (onsemi)

The LV8734VL-TLM-H is an active product with ROHS3 compliance, BiCDMOS technology, and enhanced output current capability (1.5A). Surface mount packaging (44-LSSOP) maintains form factor compatibility. Supply voltage range (0V ~ 5.5V) and load voltage range (9V ~ 32V) accommodate the A3966SLB specification. Operating temperature range (-40°C to 85°C TA) is narrower than the A3966SLB. Step resolution capability (1, 1/2, 1/4, 1/8) provides additional functional flexibility. This substitute is optimal for designs requiring surface mount compatibility and enhanced current capacity.

TB6562AFG,8,EL (Toshiba Semiconductor and Storage)

The TB6562AFG,8,EL is an active product with ROHS3 compliance and DMOS technology. Output current capability (1.5A) exceeds the A3966SLB requirement. Surface mount packaging (30-BSOP) maintains form factor compatibility. Supply voltage range (10V ~ 34V) and load voltage range (10V ~ 34V) do not fully encompass the A3966SLB lower voltage specification (4.75V). Operating temperature range (-20°C to 85°C TA) is narrower than the A3966SLB. Step resolution capability (1, 1/2, 1/4) provides functional enhancement. This substitute is suitable for applications operating above 10V supply voltage.

Frequently Asked Questions (FAQ)

Q: Can the L293D directly replace the A3966SLB without circuit modification?

A: The L293D provides functional equivalence in bipolar motor driver capability, half-bridge output configuration, and parallel interface control. However, the through-hole 16-DIP package requires PCB redesign compared to the surface-mount 16-PowerSOIC package of the A3966SLB. Output current specification (600mA) is marginally lower. Circuit validation is required to confirm compatibility with specific load characteristics.

Q: Why does the LV8734VL-TLM-H have a different package size (44-LSSOP vs. 16-PowerSOIC)?

A: The LV8734VL-TLM-H integrates additional functionality including step resolution control (1, 1/2, 1/4, 1/8) and enhanced current capability (1.5A), which necessitates a larger package footprint. The 44-pin configuration accommodates additional control and protection circuitry. PCB layout redesign is required for this substitute.

Q: Is the TB6562AFG,8,EL suitable for 5V supply voltage applications?

A: No. The TB6562AFG,8,EL minimum supply voltage specification is 10V. This substitute is not compatible with the A3966SLB 4.75V ~ 5.5V supply voltage range. Selection of this part requires system redesign to operate at higher supply voltages.

Q: What is the impact of RoHS compliance differences between the A3966SLB and substitute parts?

A: The A3966SLB is RoHS non-compliant, while all three substitute parts are ROHS3 compliant. For applications subject to RoHS regulatory requirements or customer specifications mandating RoHS compliance, the substitute parts provide regulatory alignment. Existing designs using the A3966SLB may require material declaration updates if transitioning to compliant substitutes.

Q: Can multiple substitute parts be used interchangeably in the same design?

A: No. Each substitute part has distinct electrical specifications, package configurations, and functional capabilities. Selection must be based on specific application requirements including supply voltage range, load voltage range, output current demand, operating temperature, and PCB form factor constraints. Circuit validation is required for each substitute selection.

Q: What is the significance of the operating temperature specification difference (TJ vs. TA)?

A: TJ (junction temperature) represents the maximum temperature at the semiconductor die. TA (ambient temperature) represents the maximum surrounding air temperature. The A3966SLB specifies TJ (-20°C ~ 150°C), while substitute parts specify TA (-40°C ~ 85°C or -40°C ~ 150°C). TJ specifications typically allow higher maximum temperatures than TA specifications for equivalent thermal management. Application thermal analysis is required to confirm compatibility.