LC7932M-TRM-E Equivalent & Substitute Parts

Part Overview

The LC7932M-TRM-E is an LED driver IC manufactured by onsemi, designed for LCD display applications. This component operates with a 4.5V to 5.5V supply and delivers 5 mA supply current, making it suitable for low-power display driving circuits. The device is classified as obsolete, necessitating identification of functionally equivalent alternatives for ongoing design support and production continuity.

Substiute Parts

LC7932M-TRM-E

onsemiIn Stock: 5349LC7932M-TRM-E Datasheet

Current PartRFQ

SN74LS673DW

Texas InstrumentsIn Stock: 940SN74LS673DW Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC7932M-TRM-E is determined by the following critical parameters:

• Supply Voltage Compatibility: The substitute must operate within or encompass the 4.5V to 5.5V range
• Mounting Type: Surface mount technology required for PCB integration
• Functional Classification: Logic or driver IC capable of display signal processing
• Package Form Factor: Physical dimensions must accommodate existing PCB layouts
• Product Status: Active or current production status preferred for long-term availability

The SN74LS673DW is identified as a substitute based on its active product status, surface mount configuration, and compatible supply voltage range. However, note that this substitute represents a different functional category (shift register logic versus dedicated LED driver), requiring circuit-level evaluation for application compatibility.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS673DW offers active product status and improved moisture sensitivity characteristics (MSL 1 versus MSL 4), supporting extended shelf life and reduced handling constraints. Both components maintain REACH compliance and operate within overlapping supply voltage ranges (4.75V ~ 5.25V intersection).

The SN74LS673DW provides superior long-term availability compared to the obsolete LC7932M-TRM-E. However, the functional transition from a dedicated LED driver to a shift register logic device requires verification of circuit-level compatibility and signal interface requirements in the target application.

Package form factor differences (30-SOP versus 24-SOIC) necessitate PCB layout modification. The narrower 24-SOIC package (7.50mm width) may provide space optimization benefits in constrained designs.

Frequently Asked Questions (FAQ)

Q: Can the SN74LS673DW directly replace the LC7932M-TRM-E without circuit modifications?

A: Direct pin-for-pin replacement is not possible due to different package types (30-SOP versus 24-SOIC) and functional architectures. Circuit-level evaluation is required to confirm signal compatibility and interface requirements.

Q: What are the supply voltage constraints for substitution?

A: The overlapping supply voltage range is 4.75V to 5.25V. The LC7932M-TRM-E accepts 4.5V to 5.5V, while the SN74LS673DW operates within 4.75V to 5.25V. Designs operating below 4.75V or above 5.25V may not support the substitute component.

Q: How do operating temperature ranges affect substitution decisions?

A: The LC7932M-TRM-E supports -25°C to 85°C operation, while the SN74LS673DW is rated 0°C to 70°C. Applications requiring operation below 0°C or above 70°C cannot use the substitute without thermal management modifications.

Q: What is the significance of the MSL rating difference?

A: MSL 4 (72 hours) requires controlled storage and handling to prevent moisture absorption, while MSL 1 (unlimited) allows indefinite shelf storage. The SN74LS673DW provides superior moisture tolerance, reducing production logistics complexity.

Q: Are both components RoHS and REACH compliant?

A: Both components maintain REACH compliance. The SN74LS673DW is ROHS3 compliant; the LC7932M-TRM-E compliance status is not specified in available documentation.

Q: What package considerations apply to PCB redesign?

A: The 30-SOP package (7.90mm width) differs from the 24-SOIC package (7.50mm width). PCB footprint, trace routing, and component placement require redesign. The 24-SOIC package may enable higher component density in space-constrained layouts.