A3953SB Equivalent & Substitute Parts

Part Overview

The A3953SB is a bipolar motor driver IC manufactured by Allegro MicroSystems, designed for fully integrated control and power stage applications in brushed DC and bipolar stepper motor systems. Operating across a 3V to 5.5V supply range with 1.3A output current capability, this component integrates dual half-bridge output configuration in a 16-DIP through-hole package. The A3953SB is classified as obsolete, necessitating identification of functionally equivalent alternatives for new designs and production continuity.

Substiute Parts

A3953SB

Allegro MicroSystemsIn Stock: 1815A3953SB Datasheet

Current PartRFQ

TB6562AFG,8,EL

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

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3953SB requires evaluation against the following critical parameters that define functional equivalence:

• Motor driver type: Bipolar stepper and brushed DC motor capability
• Output stage configuration: Fully integrated control and power stage
• Interface topology: Parallel control interface
• Output current rating: Minimum 1.3A capability
• Supply voltage range: Compatibility with 3V to 5.5V operation
• Load voltage range: Support for 3V to 50V motor loads
• Thermal operating range: -20°C minimum to 150°C maximum junction temperature
• Package form factor: Through-hole or surface-mount alternatives

The TB6562AFG,8,EL from Toshiba Semiconductor and Storage qualifies as a manufacturer-recommended substitute. While this part operates at a higher supply voltage range (10V to 34V) and different load voltage specification (10V to 34V), it maintains functional equivalence through bipolar motor driver architecture, fully integrated control and power stage design, parallel interface operation, and superior output current rating (1.5A). The substitute employs DMOS technology rather than bipolar technology and provides four half-bridge outputs with step resolution capability (1, 1/2, 1/4), offering enhanced functionality for stepper motor applications.

Parameter Comparison

Engineering Selection Recommendations

The TB6562AFG,8,EL represents the manufacturer-recommended substitute for the obsolete A3953SB. Selection of this alternative is justified on the following engineering grounds:

Product Status: The A3953SB is classified as obsolete, creating supply chain risk and limiting availability for new production. The TB6562AFG,8,EL maintains active product status with confirmed inventory of 10,373 pieces, ensuring long-term supply continuity.

Compliance and Certifications: The TB6562AFG,8,EL achieves ROHS3 compliance, meeting current regulatory requirements for electronic components in regulated markets. The A3953SB is RoHS non-compliant, presenting compliance barriers for new designs targeting regulated applications.

Functional Capability: Both parts maintain bipolar motor driver architecture with fully integrated control and power stages operating on parallel interfaces. The substitute provides enhanced output current (1.5A versus 1.3A) and expanded half-bridge configuration (4 versus 2), supporting more complex motor control topologies.

Design Integration Considerations: Substitution requires evaluation of supply voltage requirements. Applications operating exclusively within the 3V to 5.5V range must incorporate voltage regulation or redesign to accommodate the TB6562AFG,8,EL minimum 10V supply requirement. Load voltage range differences (3V to 50V for A3953SB versus 10V to 34V for substitute) must be assessed against specific motor specifications.

Packaging Transition: Migration from through-hole 16-DIP to surface-mount 30-BSOP packaging requires PCB redesign and assembly process modification. This transition aligns with industry manufacturing trends toward surface-mount technology.

Frequently Asked Questions (FAQ)

Q: Can the TB6562AFG,8,EL directly replace the A3953SB in existing PCB designs?

A: Direct pin-for-pin replacement is not possible due to different package types (16-DIP through-hole versus 30-BSOP surface-mount) and pin counts. PCB redesign is required. Additionally, the supply voltage range difference (3V–5.5V versus 10V–34V) necessitates circuit topology evaluation.

Q: What are the critical voltage compatibility issues between these parts?

A: The A3953SB operates with a 3V to 5.5V supply range and supports motor loads from 3V to 50V. The TB6562AFG,8,EL requires a 10V to 34V supply and supports 10V to 34V load voltages. Applications with low-voltage supplies below 10V cannot use the substitute without external voltage regulation.

Q: How do the output configurations differ?

A: The A3953SB provides two half-bridge outputs suitable for single bipolar stepper motor or dual brushed DC motor control. The TB6562AFG,8,EL provides four half-bridge outputs, enabling control of two bipolar stepper motors or four independent brushed DC motors with integrated step resolution capability (1, 1/2, 1/4).

Q: What thermal operating range differences exist?

A: The A3953SB operates from -20°C to 150°C junction temperature, supporting extended high-temperature applications. The TB6562AFG,8,EL operates from -20°C to 85°C ambient temperature, limiting use in high-temperature environments above 85°C.

Q: Does the substitute provide stepper motor step resolution?

A: Yes. The TB6562AFG,8,EL supports step resolution modes of 1, 1/2, and 1/4, enabling microstepping control for stepper motors. The A3953SB does not specify step resolution capability.

Q: What are the compliance implications of substitution?

A: The TB6562AFG,8,EL achieves ROHS3 compliance, meeting current environmental and regulatory standards. The A3953SB is RoHS non-compliant. New designs targeting regulated markets should adopt the compliant substitute.

Q: Are there current rating differences?

A: The TB6562AFG,8,EL provides 1.5A output current versus 1.3A for the A3953SB, representing a 15% increase in current capability. This enhancement supports higher motor torque or additional load capacity.