LB1947-E Motor Driver IC Equivalent & Substitute Parts

Part Overview

The LB1947-E is a fully integrated brushed DC motor driver IC manufactured by onsemi, designed for general-purpose motor control applications. It operates within a 4.75V to 5.25V supply voltage range and delivers 2A output current through a half-bridge configuration with parallel interface control. The device is packaged in a 13-SIP Exposed Tab through-hole format.

The LB1947-E is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance requirements for systems utilizing this motor driver architecture.

Substiute Parts

LB1947-E

onsemiIn Stock: 3863LB1947-E Datasheet

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TA7267BP(O)

Toshiba Semiconductor and StorageIn Stock: 1143TA7267BP(O) Datasheet

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TA7291FG(O,EL)

Toshiba Semiconductor and StorageIn Stock: 1154TA7291FG(O,EL) Datasheet

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TA7291SG(O,J)

Toshiba Semiconductor and StorageIn Stock: 789TA7291SG(O,J) Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LB1947-E are identified based on the following critical parameters that determine functional compatibility:

Motor driver type and control architecture (fully integrated, bipolar, half-bridge configuration with parallel interface), brushed DC motor application support, output current capability, supply voltage range overlap or compatibility with system requirements, load voltage handling capability, operating temperature range, and through-hole mounting compatibility.

The three substitute parts identified—TA7267BP(O), TA7291FG(O,EL), and TA7291SG(O,J)—all share the core functional characteristics of the LB1947-E: bipolar technology, half-bridge output configuration, parallel interface control, and fully integrated driver architecture for brushed DC motors. However, each substitute presents distinct trade-offs in supply voltage range, output current rating, package format, and product status that must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

TA7267BP(O) is an active product with RoHS compliance. It maintains through-hole mounting compatibility and operates across a 6V to 18V supply range, which overlaps with the LB1947-E's upper voltage boundary. However, output current is reduced to 1A, and load voltage is limited to 18V maximum, which may not accommodate applications requiring the full 10V to 45V load voltage range of the original part.

TA7291FG(O,EL) is an active, RoHS-compliant product with the widest supply voltage range (4.5V to 20V) and load voltage capability (0V to 20V). It provides the lowest output current at 400mA and requires surface-mount assembly, which represents a significant design change from through-hole mounting. This option is suitable for applications with lower current requirements and where PCB redesign for surface-mount technology is feasible.

TA7291SG(O,J) is an active, RoHS-compliant product with through-hole mounting in a 9-SIP package. It offers a 4.5V to 20V supply range and 0V to 20V load voltage capability, matching the TA7291FG(O,EL) electrical specifications while maintaining through-hole compatibility. Output current is limited to 400mA. This option provides the closest form-factor compatibility with the original LB1947-E for through-hole designs, though with reduced current capacity.

All three substitutes are active products with superior compliance status compared to the obsolete LB1947-E, ensuring long-term supply chain viability.

Frequently Asked Questions (FAQ)

Q: Can TA7267BP(O) directly replace LB1947-E in all applications?

A: TA7267BP(O) shares the core motor driver architecture and through-hole mounting format. However, it delivers 1A output current versus the LB1947-E's 2A, and its maximum load voltage is 18V compared to the original's 45V. Applications requiring full 2A output or load voltages exceeding 18V require design verification or alternative selection.

Q: Why do TA7291FG(O,EL) and TA7291SG(O,J) have lower output current ratings?

A: Both TA7291 variants are rated for 400mA output current, significantly lower than the LB1947-E's 2A specification. These parts are suitable only for applications with proportionally lower motor current requirements. Output current is a critical parameter that must match or exceed application demands.

Q: What is the impact of switching from through-hole to surface-mount packaging?

A: TA7291FG(O,EL) requires surface-mount assembly on a 16-BSOP package, necessitating PCB redesign, different assembly processes, and updated test procedures. TA7291SG(O,J) maintains through-hole compatibility in a 9-SIP package, eliminating this design burden while preserving electrical functionality within its current rating.

Q: Are all substitute parts RoHS compliant?

A: Yes. TA7267BP(O), TA7291FG(O,EL), and TA7291SG(O,J) are all RoHS compliant. The original LB1947-E does not specify RoHS status. All substitutes meet modern environmental and regulatory requirements.

Q: What supply voltage range is compatible across all parts?

A: The LB1947-E operates at 4.75V to 5.25V. TA7267BP(O) requires 6V minimum, creating a gap. TA7291FG(O,EL) and TA7291SG(O,J) both support 4.5V to 20V, providing full overlap with the original's supply range and extended upper capability.

Q: Which substitute is the best choice for direct replacement?

A: Selection depends on application requirements. For through-hole mounting with current requirements up to 1A and load voltages to 18V, TA7267BP(O) is suitable. For through-hole mounting with lower current (400mA) and extended voltage range, TA7291SG(O,J) is appropriate. For surface-mount designs with 400mA current and extended voltage range, TA7291FG(O,EL) is the option. No single substitute matches all LB1947-E specifications; application-specific evaluation is required.