STK551-391A-E Equivalent & Substitute Parts

Part Overview

The STK551-391A-E is a motor driver IC manufactured by onsemi, classified as a Power Management (PMIC) component. This device is designed for motor control applications and is currently listed as obsolete. Due to its obsolete status, identifying functionally equivalent substitute parts is essential for system redesign, legacy product support, and continued component availability.

Substiute Parts

STK551-391A-E

onsemiIn Stock: 1028STK551-391A-E Datasheet

Current PartRFQ

STK551U392A-E

onsemiIn Stock: 1490STK551U392A-E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The STK551-391A-E shares the same base product number (STK551) with its identified substitute, the STK551U392A-E. Both devices are manufactured by onsemi and classified within the Power Management (PMIC) category. The substitution is valid based on the following criteria:

• Shared manufacturer and product family (STK551 series)
• Identical REACH and ECCN compliance status
• Matching Moisture Sensitivity Level (MSL 1)
• Identical HTSUS classification
• Both components are obsolete, indicating end-of-life status across the product line

The STK551U392A-E provides enhanced specifications including defined output configuration (Half Bridge 3), rated current capacity (15A output, 30A peak), and comprehensive fault protection features, making it suitable for motor driver applications requiring these performance parameters.

Parameter Comparison

Engineering Selection Recommendations

Selection between the STK551-391A-E and STK551U392A-E should be based on the following engineering criteria:

Both components share identical compliance and regulatory status (REACH Unaffected, EAR99 classification, MSL 1). The primary differentiation lies in documented electrical specifications and package configuration. The STK551U392A-E provides explicit performance parameters including Half Bridge (3) output configuration, 15A continuous output current, 30A peak current capability, and supply voltage range of 12.5V to 17.5V, with maximum load voltage of 450V. This device includes integrated fault protection (current limiting, shoot-through protection, UVLO) and bootstrap circuit functionality.

Component selection should align with the specific motor driver requirements of the target application, including output current demands, voltage specifications, and thermal operating range (-40°C to 150°C junction temperature for STK551U392A-E).

Frequently Asked Questions (FAQ)

Q: Why is the STK551-391A-E listed as obsolete? A: The STK551-391A-E is an end-of-life component from onsemi. Both the main part and its substitute (STK551U392A-E) share obsolete status, indicating discontinuation across the STK551 product family.

Q: What are the key differences between STK551-391A-E and STK551U392A-E? A: The STK551U392A-E provides documented electrical specifications including Half Bridge (3) configuration, 15A output current rating, and comprehensive fault protection features. The STK551-391A-E specifications are less detailed in the available documentation. Both share identical compliance status and MSL rating.

Q: Are the packages compatible between these parts? A: The STK551U392A-E uses a 29-SSIP Module with 21 leads and formed leads for through-hole mounting. Package information for the STK551-391A-E is not specified in available documentation. Physical compatibility must be verified against the original application design.

Q: Do both parts meet current regulatory requirements? A: Both components are REACH Unaffected and classified as EAR99 for export control purposes. The STK551U392A-E is ROHS3 compliant. Regulatory compliance verification should be performed for specific end-use applications.

Q: What is the moisture sensitivity level for these components? A: Both the STK551-391A-E and STK551U392A-E have MSL 1 (Unlimited), indicating no moisture sensitivity restrictions during storage or handling.