LM628N-8 Equivalent & Substitute Parts

Part Overview

The LM628N-8 is a motor driver IC manufactured by Texas Instruments, designed for brushless DC (BLDC) servo and brushed DC servo motor control applications. It functions as a commutation and direction management controller with a pre-driver half-bridge output configuration, operating across a 4.5V to 5.5V supply voltage range. The device is packaged in a 28-DIP through-hole format.

The LM628N-8 is classified as obsolete. Locating equivalent substitute parts is necessary for new designs, production continuity, and system upgrades where through-hole or surface-mount alternatives are preferred.

Substiute Parts

LM628N-8

Texas InstrumentsIn Stock: 1531LM628N-8 Datasheet

Current PartRFQ

LM629M-6/NOPB

Texas InstrumentsIn Stock: 2200LM629M-6/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM628N-8 is determined by the following critical parameters:

• Motor control function (commutation and direction management for BLDC and brushed DC servo motors)
• Output configuration (pre-driver half-bridge topology with 4 outputs)
• Parallel interface compatibility
• Supply voltage range (4.5V ~ 5.5V)
• Operating temperature range (-40°C ~ 85°C)
• Base product series compatibility (LM629 series)

The LM629M-6/NOPB qualifies as a manufacturer-recommended substitute. While it differs in packaging format (24-SOIC surface-mount versus 28-DIP through-hole) and RoHS compliance status, it maintains functional equivalence across all critical motor control parameters and electrical specifications.

Parameter Comparison

Engineering Selection Recommendations

The LM629M-6/NOPB is the manufacturer-recommended substitute for the LM628N-8. Both devices are manufactured by Texas Instruments and provide identical motor control functionality across all specified electrical parameters.

Selection between these parts depends on design constraints:

• LM628N-8: Appropriate for legacy systems or designs requiring through-hole mounting and existing PCB layouts designed for 28-DIP packages.
• LM629M-6/NOPB: Recommended for new designs due to active product status, ROHS3 compliance, and surface-mount packaging efficiency. The smaller 24-SOIC footprint reduces board space requirements.

The LM629M-6/NOPB offers superior compliance status (ROHS3 Compliant versus RoHS non-compliant) and active manufacturer support, making it the preferred choice for applications subject to environmental or regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can the LM629M-6/NOPB directly replace the LM628N-8 in existing designs?

A: Functional replacement is possible due to identical motor control specifications and electrical parameters. However, physical replacement requires PCB redesign due to different package formats (28-DIP through-hole versus 24-SOIC surface-mount). Pin configuration and signal assignments must be verified against device datasheets before implementation.

Q: What is the primary difference between these two parts?

A: The LM628N-8 and LM629M-6/NOPB differ in packaging technology (through-hole versus surface-mount), product status (obsolete versus active), and RoHS compliance. All motor control functions, electrical specifications, and operating parameters remain identical.

Q: Is the LM629M-6/NOPB suitable for new product designs?

A: Yes. The LM629M-6/NOPB is classified as active and ROHS3 compliant, making it appropriate for new designs. It provides the same motor control functionality as the LM628N-8 with improved compliance status and ongoing manufacturer support.

Q: Are there pin-to-pin compatibility considerations?

A: No. The LM628N-8 (28-DIP) and LM629M-6/NOPB (24-SOIC) have different pin counts and configurations. Direct pin-to-pin replacement is not possible. Circuit redesign is required for physical substitution.

Q: What supply voltage range do these devices support?

A: Both the LM628N-8 and LM629M-6/NOPB operate across a 4.5V to 5.5V supply voltage range and support identical motor control applications for brushless DC and brushed DC servo motors.