A3949SLPTR-T Equivalent & Substitute Parts

Part Overview

The A3949SLPTR-T is a brushed DC motor driver IC manufactured by Allegro MicroSystems, classified as a Power Management PMIC. This fully integrated motor driver features a half-bridge output configuration with parallel interface control, rated for 8V to 36V supply and load voltages, delivering 2.8A output current. The device is packaged in a 16-eTSSOP format with exposed pad and operates across -20°C to 150°C junction temperature range.

The A3949SLPTR-T has reached obsolete product status. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this motor driver topology.

Substiute Parts

A3949SLPTR-T

Allegro MicroSystemsIn Stock: 12400A3949SLPTR-T Datasheet

Current PartRFQ

A3950SEUTR-T

Allegro MicroSystemsIn Stock: 16565A3950SEUTR-T Datasheet

MFR RecommendedRFQ

A3950SLPTR-T

Allegro MicroSystemsIn Stock: 13550A3950SLPTR-T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the A3949SLPTR-T are identified based on strict electrical and mechanical parameter alignment. The following criteria determine substitution eligibility:

Electrical Parameters (Must Match):

• Motor type: Brushed DC
• Output configuration: Half Bridge (2)
• Interface: Parallel
• Technology: DMOS
• Current rating: 2.8A
• Voltage supply range: 8V ~ 36V
• Voltage load range: 8V ~ 36V
• Operating temperature range: -20°C ~ 150°C (TJ)

Mechanical Parameters (Must Match):

• Mounting type: Surface Mount
• Pin count and functionality: 16-pin configuration

Compliance Parameters:

• RoHS3 Compliant
• REACH Unaffected
• ECCN: EAR99

Substitute parts may differ in package format (TSSOP vs. QFN), product status (Active vs. Obsolete), and moisture sensitivity level, provided all electrical and mechanical parameters remain equivalent.

Parameter Comparison

Engineering Selection Recommendations

A3950SLPTR-T (Parametric Equivalent): This part maintains identical electrical specifications and package format (16-eTSSOP-EP) to the A3949SLPTR-T. The primary distinction is active product status, ensuring ongoing manufacturer support and supply availability. Moisture sensitivity level increases from MSL 1 to MSL 2, requiring standard handling procedures within a one-year storage window. This substitute is suitable for direct replacement in existing designs without PCB layout modifications.

A3950SEUTR-T (MFR Recommended): This part is the manufacturer-recommended substitute, offering active product status and full electrical equivalence. The package format differs, utilizing 16-QFN (4x4) instead of 16-eTSSOP-EP. This package change requires PCB layout redesign, including modified footprint, trace routing, and thermal management considerations. Selection of this part is appropriate for new designs or redesign initiatives where package optimization is beneficial. Moisture sensitivity level is MSL 2 (1 Year).

Both substitutes maintain compliance with RoHS3 and REACH requirements. Selection between A3950SLPTR-T and A3950SEUTR-T depends on design constraints: A3950SLPTR-T for minimal redesign effort, A3950SEUTR-T for new or optimized designs.

Frequently Asked Questions (FAQ)

Q: Can A3950SLPTR-T be used as a direct replacement for A3949SLPTR-T? A: Yes. The A3950SLPTR-T is electrically and mechanically equivalent, with identical package format (16-eTSSOP-EP). No PCB modifications are required. The primary difference is product status (Active vs. Obsolete) and moisture sensitivity level (MSL 2 vs. MSL 1).

Q: What are the implications of the package change from TSSOP to QFN? A: The A3950SEUTR-T uses a 16-QFN (4x4) package instead of 16-eTSSOP-EP. This requires PCB footprint redesign, modified trace routing, and potentially different thermal management approaches. Electrical performance remains equivalent.

Q: Are there any compliance differences between the three parts? A: All three parts are ROHS3 Compliant, REACH Unaffected, and carry ECCN EAR99 classification. No compliance barriers exist for substitution.

Q: What is the significance of the moisture sensitivity level change? A: The A3949SLPTR-T carries MSL 1 (Unlimited storage), while both A3950 variants carry MSL 2 (1 Year storage). MSL 2 requires standard moisture control procedures during storage and handling, with a one-year shelf life limit from the date of manufacture.

Q: Which substitute should be selected for a new design? A: The A3950SEUTR-T is the manufacturer-recommended substitute for new designs. The QFN package offers improved thermal performance and reduced PCB area compared to TSSOP, supporting modern design optimization objectives.

Q: Are the electrical parameters identical across all three parts? A: Yes. All three parts share identical electrical specifications: 2.8A output current, 8V to 36V supply and load voltage range, -20°C to 150°C operating temperature, half-bridge output configuration, parallel interface, and DMOS technology.