A3949SLPTR Equivalent & Substitute Parts

Part Overview

The A3949SLPTR is a brushed DC motor driver IC from Allegro MicroSystems, designed for general-purpose motor control applications. It integrates both control and power stages in a single package, operating across an 8V to 36V supply range with 2.8A output capability. The device is classified as obsolete, which necessitates identification of active equivalent parts for new designs and ongoing production support.

Substiute Parts

A3949SLPTR

Allegro MicroSystemsIn Stock: 5953A3949SLPTR Datasheet

Current PartRFQ

A3950SLPTR-T

Allegro MicroSystemsIn Stock: 13550A3950SLPTR-T Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

The A3950SLPTR-T qualifies as a parametric equivalent to the A3949SLPTR based on the following critical parameters:

Motor driver classification and function remain identical: both are fully integrated brushed DC motor drivers with control and power stages combined. Output configuration, interface type, and technology platform (DMOS) are unchanged. Electrical specifications match exactly: 2.8A output current, 8V to 36V supply and load voltage range, and -20°C to 150°C operating temperature. Package and mounting specifications are identical: 16-TSSOP with exposed pad in surface mount configuration.

The primary distinction is product status: A3950SLPTR-T is active and currently manufactured, whereas A3949SLPTR is obsolete. This substitution enables continued design support and production continuity.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production applications, A3950SLPTR-T is the appropriate selection. The part maintains electrical and mechanical compatibility with A3949SLPTR while offering active product status and ROHS3 compliance. The A3950SLPTR-T carries a moisture sensitivity level of 2 with a 1-year floor life, compared to the unlimited floor life of the obsolete A3949SLPTR. Both parts share identical REACH and ECCN classifications (REACH Unaffected, EAR99).

Existing designs using A3949SLPTR can transition to A3950SLPTR-T without circuit modifications, as all functional parameters, electrical ratings, and package specifications are equivalent.

Frequently Asked Questions (FAQ)

Q: Can A3950SLPTR-T directly replace A3949SLPTR in existing designs?

A: Yes. Both parts are electrically and mechanically identical in all critical parameters: output current (2.8A), supply voltage range (8V–36V), output configuration (half bridge), interface type (parallel), and package (16-TSSOP with exposed pad). No circuit modifications are required.

Q: What is the difference between these two parts?

A: The primary differences are product status and compliance. A3949SLPTR is obsolete, while A3950SLPTR-T is active. A3950SLPTR-T is ROHS3 compliant, whereas A3949SLPTR is RoHS non-compliant. Moisture sensitivity levels differ: A3949SLPTR has MSL 1 (unlimited floor life), and A3950SLPTR-T has MSL 2 (1-year floor life).

Q: Are there any pin or footprint differences?

A: No. Both parts use the identical 16-TSSOP package with exposed pad. PCB footprints and pinouts are fully compatible.

Q: Why is A3949SLPTR obsolete?

A: The A3949SLPTR has been discontinued by Allegro MicroSystems. A3950SLPTR-T is the active equivalent part for ongoing production and new designs.

Q: What are the compliance differences?

A: A3950SLPTR-T meets ROHS3 compliance requirements, making it suitable for applications subject to RoHS directives. A3949SLPTR is RoHS non-compliant. Both parts are REACH Unaffected and classified as EAR99 for export control purposes.