A3979SLP Equivalent & Substitute Parts

Part Overview

The A3979SLP is a bipolar stepper motor driver IC manufactured by Allegro MicroSystems, designed for fully integrated motor control and power stage applications. This device operates across a supply voltage range of 3V to 5.5V with load voltage capability from 8V to 35V, delivering 2.5A output current. The A3979SLP is classified as an obsolete product, necessitating identification of active equivalent components for new designs and ongoing production requirements.

Substiute Parts

A3979SLP

Allegro MicroSystemsIn Stock: 1216A3979SLP Datasheet

Current PartRFQ

TB6560AHQ,8

Toshiba Semiconductor and StorageIn Stock: 1000362TB6560AHQ,8 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the A3979SLP is determined by the following critical parameters:

• Motor control type: Bipolar stepper motor driver
• Output stage configuration: Half Bridge (4)
• Fully integrated control and power stage function
• Output current capability: minimum 2.5A
• Supply voltage compatibility: overlap with 3V ~ 5.5V range
• Load voltage range: minimum 8V capability
• Step resolution support: 1, 1/2, 1/4 microstepping minimum

The TB6560AHQ,8 qualifies as a functional equivalent based on these core parameters. Both devices provide bipolar stepper motor drive capability with half-bridge output configuration and fully integrated control and power stages. The TB6560AHQ,8 exceeds the A3979SLP in output current (3A vs 2.5A) and supports additional step resolution (1/8 microstepping). However, the TB6560AHQ,8 operates at a narrower supply voltage range (4.5V ~ 5.5V) and uses a different package type and mounting technology.

Parameter Comparison

Engineering Selection Recommendations

The TB6560AHQ,8 is an active product with ROHS3 compliance, addressing the obsolescence status of the A3979SLP. Selection of this substitute requires evaluation of the following factors:

Supply voltage range: The TB6560AHQ,8 operates at 4.5V ~ 5.5V, which excludes the lower 3V ~ 3.9V operating window of the A3979SLP. Applications requiring 3V supply operation cannot use this substitute without additional voltage regulation.

Load voltage range: The TB6560AHQ,8 supports 4.5V ~ 34V load voltage, which is narrower than the A3979SLP range of 8V ~ 35V. Applications requiring load voltages below 4.5V or above 34V require alternative solutions.

Mounting technology: The A3979SLP uses surface mount packaging (28-TSSOP), while the TB6560AHQ,8 uses through-hole packaging (25-SSIP). PCB redesign is necessary for mechanical and electrical integration.

Output current: The TB6560AHQ,8 provides 3A output current, exceeding the A3979SLP specification of 2.5A, offering improved current handling capability.

Temperature range: The A3979SLP supports junction temperatures to 150°C, while the TB6560AHQ,8 is rated to 85°C ambient. Applications requiring extended high-temperature operation may require alternative components.

Frequently Asked Questions (FAQ)

Q: Can the TB6560AHQ,8 directly replace the A3979SLP in existing designs?

A: Direct replacement is not possible due to package type differences. The A3979SLP uses 28-TSSOP surface mount packaging, while the TB6560AHQ,8 uses 25-SSIP through-hole packaging. PCB redesign is required for mechanical and electrical integration.

Q: What is the critical supply voltage consideration for substitution?

A: The TB6560AHQ,8 operates at 4.5V ~ 5.5V supply voltage, which does not cover the lower 3V ~ 3.9V range of the A3979SLP. Applications with supply voltages below 4.5V cannot use this substitute without external voltage regulation or alternative component selection.

Q: Are there differences in load voltage capability?

A: Yes. The A3979SLP supports load voltages from 8V to 35V, while the TB6560AHQ,8 supports 4.5V to 34V. The TB6560AHQ,8 cannot operate with load voltages below 4.5V or above 34V.

Q: How do the output current specifications compare?

A: The TB6560AHQ,8 provides 3A output current, which exceeds the A3979SLP specification of 2.5A. This represents improved current handling capability for motor drive applications.

Q: What compliance differences exist between these components?

A: The A3979SLP is RoHS non-compliant, while the TB6560AHQ,8 is ROHS3 compliant. For applications requiring RoHS compliance, the TB6560AHQ,8 meets current regulatory requirements.

Q: Are there temperature rating differences?

A: Yes. The A3979SLP is rated for junction temperatures from -20°C to 150°C, while the TB6560AHQ,8 is rated for ambient temperatures from -30°C to 85°C. Applications requiring sustained operation above 85°C ambient temperature may require alternative components.

Q: Do both devices support the same microstepping resolutions?

A: Both devices support 1, 1/2, 1/4, and 1/16 step resolutions. The TB6560AHQ,8 additionally supports 1/8 step resolution, providing finer microstepping capability.