STA7133MC Equivalent & Substitute Parts

Part Overview

The STA7133MC is a 2-phase stepper motor unipolar driver manufactured by Sanken Electric USA Inc., classified as a Power Management (PMIC) component. This integrated circuit combines control and power stage functionality in a fully integrated driver architecture, designed for brushed DC and unipolar stepper motor applications. The device is currently listed as obsolete, making identification of equivalent substitute parts essential for system redesign, legacy product support, and component procurement planning.

Substiute Parts

STA7133MC

Sanken Electric USA Inc.In Stock: 1139STA7133MC Datasheet

Current PartRFQ

STK672-642AN-E

onsemiIn Stock: 1467STK672-642AN-E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the STA7133MC is determined by the following critical parameters:

Motor Control Architecture: Both the main part and substitute must support unipolar stepper motor driver functionality with fully integrated control and power stage design.

Output Configuration: Half bridge (2) output configuration is required for functional equivalence.

Interface Type: Parallel interface compatibility is mandatory for direct replacement without redesign of control circuitry.

Power MOSFET Technology: The driver must utilize Power MOSFET technology for output stage implementation.

Current Rating: Output current capability must meet or exceed 3A to support equivalent motor loads.

Voltage Specifications: Supply voltage range and load voltage range must accommodate the original application requirements.

Mounting and Packaging: Through-hole mounting with SSIP package form factor ensures mechanical compatibility with existing PCB layouts.

The STK672-642AN-E manufactured by onsemi meets these substitution criteria as a unipolar motor driver with fully integrated control and power stage, half bridge output configuration, parallel interface, and Power MOSFET technology.

Parameter Comparison

Engineering Selection Recommendations

Functional Compatibility: The STK672-642AN-E provides functional equivalence as a unipolar stepper motor driver with integrated control and power stage architecture. Both devices employ Power MOSFET technology with half bridge output configuration and parallel interface control.

Electrical Parameter Alignment: The substitute part exceeds the output current specification (3.3A versus 3A), providing margin for motor load requirements. Supply voltage range of the substitute (4.75V ~ 5.25V) represents a subset of the main part specification, requiring verification that application supply voltage remains within this narrower range. Load voltage range differs at the lower bound (0V versus 10V minimum), which may provide additional operational flexibility depending on application requirements.

Temperature Operating Range: The substitute part supports extended high-temperature operation (105°C versus 80°C), beneficial for thermal margin. The narrower low-temperature range (0°C minimum versus -20°C) must be evaluated against application environmental requirements.

Packaging and Compliance: The STK672-642AN-E uses a 19-SSIP package compared to the 18-SSIP of the main part, requiring PCB layout modification to accommodate the additional pin. Both devices meet RoHS compliance requirements; the substitute meets the current ROHS3 standard. The substitute carries REACH Unaffected status and EAR99 ECCN classification.

Product Status: Both the main part and substitute are classified as obsolete, indicating that long-term availability may be limited for either option. Component procurement strategy should account for this status in production planning.

Frequently Asked Questions (FAQ)

Q: Can the STK672-642AN-E directly replace the STA7133MC without PCB modification?

A: No. The STK672-642AN-E uses a 19-SSIP package with 19 pins, while the STA7133MC uses an 18-SSIP package with 18 pins. PCB layout modification is required to accommodate the different pin configuration. Pin-to-pin functional mapping must be verified against both device datasheets before implementation.

Q: What is the impact of the different supply voltage ranges?

A: The STA7133MC supports 0V ~ 5.5V supply voltage, while the STK672-642AN-E supports 4.75V ~ 5.25V. If the application supply voltage falls outside the 4.75V ~ 5.25V window, the substitute part is not suitable. Applications operating at the extremes of the original specification (below 4.75V or above 5.25V) require alternative solutions.

Q: Are there differences in motor control capabilities?

A: The STA7133MC supports step resolution options of 1, 1/2, 1/4, 1/8, and 1/16. The STK672-642AN-E supports step resolution options of 1 and 1/2. Applications requiring finer step resolution (1/4, 1/8, or 1/16) cannot use the substitute part without alternative control architecture.

Q: How do the output current ratings affect motor selection?

A: The STA7133MC is rated for 3A output current, while the STK672-642AN-E is rated for 3.3A. The substitute part provides 10% additional current capacity. Motor load current requirements must not exceed 3A for the main part or 3.3A for the substitute. The substitute offers margin for applications at the upper end of the original specification.

Q: What are the temperature operating range implications?

A: The STA7133MC operates from -20°C to 80°C, while the STK672-642AN-E operates from 0°C to 105°C. Applications requiring operation below 0°C cannot use the substitute. Applications requiring operation above 80°C benefit from the substitute's extended range. Temperature derating curves from device datasheets should be consulted for operation near specification limits.

Q: Is the substitute part suitable for new designs?

A: Both the STA7133MC and STK672-642AN-E are classified as obsolete products. Neither part is recommended for new designs. Current-generation unipolar stepper motor driver alternatives should be evaluated for new product development to ensure long-term component availability and support.

Q: What compliance certifications apply to the substitute part?

A: The STK672-642AN-E meets ROHS3 compliance, REACH Unaffected status, and carries EAR99 ECCN classification. These certifications indicate compliance with current environmental and export regulations applicable to electronic components.