LB11847L-E Equivalent & Substitute Parts

Part Overview

The LB11847L-E is a bipolar motor driver IC manufactured by onsemi, designed for stepper motor control applications. It integrates both control and power stage functionality in a 28-HDIP through-hole package, operating from a 4.75V to 5.25V supply with load voltage capability up to 45V. The device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support.

Substiute Parts

LB11847L-E

onsemiIn Stock: 1059LB11847L-E Datasheet

Current PartRFQ

A3966SLBTR-T

Allegro MicroSystemsIn Stock: 18503A3966SLBTR-T Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LB11847L-E is based on the following critical parameters that must be maintained or exceeded:

• Motor Type & Function: Bipolar stepper motor driver with fully integrated control and power stage
• Output Configuration: Half Bridge (4) topology for bipolar motor control
• Interface Type: Parallel control interface
• Current Rating: Minimum 650mA output current (substitute may have lower rating than original 1.5A)
• Supply Voltage Range: 4.75V minimum supply voltage
• Load Voltage Capability: Minimum 30V load voltage support
• Operating Temperature Range: Minimum -20°C to 85°C

The A3966SLBTR-T qualifies as a functional equivalent based on these parameters. While it features a different package type (16-SOIC surface mount versus 28-SDIP through hole) and lower output current rating (650mA versus 1.5A), it maintains the core bipolar stepper driver functionality with parallel interface control and meets the minimum voltage and temperature requirements.

Parameter Comparison

Engineering Selection Recommendations

The A3966SLBTR-T is an active production equivalent for the obsolete LB11847L-E. Selection of this substitute requires evaluation of the following factors:

Electrical Compatibility: The substitute maintains bipolar stepper driver functionality with parallel interface control. The reduced output current rating (650mA versus 1.5A) limits motor torque capability and requires motor selection accordingly. The lower maximum load voltage (30V versus 45V) restricts high-voltage motor applications.

Package and Assembly Considerations: The transition from 28-SDIP through-hole to 16-SOIC surface mount requires PCB redesign and assembly process changes. Surface mount technology offers improved thermal performance and reduced board space.

Compliance and Availability: The A3966SLBTR-T carries RoHS3 compliance and is in active production with substantial inventory availability (18,437 pieces), ensuring long-term supply continuity compared to the obsolete LB11847L-E.

Temperature Performance: The substitute supports an extended operating temperature range (-20°C to 150°C junction temperature) compared to the original device (-20°C to 85°C ambient), providing thermal margin for demanding applications.

Frequently Asked Questions (FAQ)

Q: Can the A3966SLBTR-T directly replace the LB11847L-E without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (28-SDIP versus 16-SOIC) and pin counts (28 versus 16). PCB redesign is required. However, the parallel control interface and half-bridge output configuration are functionally compatible.

Q: What is the impact of the lower 650mA output current rating on motor selection?

A: The substitute supports stepper motors with phase currents up to 650mA. Applications requiring higher motor torque (above 650mA per phase) must select alternative drivers or lower-torque motor designs.

Q: Are there load voltage limitations with the A3966SLBTR-T?

A: The substitute supports load voltages up to 30V, compared to the original 45V maximum. Applications requiring motor supply voltages above 30V require alternative driver selection.

Q: What are the assembly implications of switching from through-hole to surface mount?

A: Surface mount assembly requires SMT manufacturing capability and modified PCB layout. The 16-SOIC package occupies less board area and offers improved thermal characteristics through the exposed pad design.

Q: Is the A3966SLBTR-T suitable for industrial temperature range applications?

A: The device operates to 150°C junction temperature, supporting extended temperature applications. Verify specific application temperature requirements against the -20°C to 150°C operating range.

Q: What compliance certifications apply to the A3966SLBTR-T?

A: The substitute is RoHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for new product designs.