BU45K484G-TL Equivalent & Substitute Parts

Part Overview

The BU45K484G-TL is a voltage supervisor IC manufactured by Rohm Semiconductor, designed for single-channel voltage monitoring applications. This component functions as a voltage detector with open drain or open collector output, providing active low reset functionality. The BU45K484G-TL is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The part is housed in a 3-SSOP package and operates across the industrial temperature range of -40°C to 105°C.

Substiute Parts

BU45K484G-TL

Rohm SemiconductorIn Stock: 1110BU45K484G-TL Datasheet

Current PartRFQ

BD45482G-TR

Rohm SemiconductorIn Stock: 3783BD45482G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU45K484G-TL is determined by strict alignment of the following critical parameters:

• Single-channel voltage monitoring capability
• 4.8V voltage threshold setting
• Open drain or open collector output configuration
• Active low reset signal polarity
• Surface mount technology compatibility
• Operating temperature range of -40°C to 105°C
• ROHS3 compliance and REACH unaffected status

The BD45482G-TR qualifies as a manufacturer-recommended substitute based on matching all core functional parameters. While package geometry differs (5-SSOP versus 3-SSOP), both packages are surface-mount compatible and accommodate the same electrical specifications. The reset timeout specification differs between parts (180ms minimum for BD45482G-TR versus 240ms minimum for BU45K484G-TL), which must be evaluated within the context of the specific application circuit.

Parameter Comparison

Engineering Selection Recommendations

The BD45482G-TR is the manufacturer-recommended substitute for the obsolete BU45K484G-TL. Both components maintain identical voltage threshold, output configuration, and reset polarity specifications. Selection of the BD45482G-TR provides the advantage of active product status, ensuring continued availability and manufacturing support.

The reset timeout differential (180ms versus 240ms) requires circuit-level evaluation. Applications with timing-critical reset sequences must verify that the shorter timeout of the BD45482G-TR does not conflict with system initialization requirements.

Package transition from 3-SSOP to 5-SSOP necessitates PCB layout modification. Both packages are surface-mount technologies with compatible lead pitch and soldering processes. The improved MSL rating of the BD45482G-TR (1 versus 3) provides enhanced moisture tolerance during storage and assembly operations.

Both parts maintain ROHS3 compliance and REACH unaffected status, supporting regulatory requirements for industrial and commercial applications.

Frequently Asked Questions (FAQ)

Q: Can the BD45482G-TR directly replace the BU45K484G-TL without circuit modification?

A: Electrical substitution is valid based on matching voltage threshold, output type, and reset polarity. PCB layout modification is required due to package geometry differences (3-SSOP to 5-SSOP). Reset timeout specification differences must be evaluated within the application context.

Q: What is the significance of the reset timeout difference between these parts?

A: The BU45K484G-TL specifies 240ms minimum reset timeout, while the BD45482G-TR specifies 180ms minimum. This parameter defines the duration of the active low reset pulse. Applications dependent on specific reset pulse duration must verify compatibility with the shorter timeout of the substitute part.

Q: Are there package compatibility considerations for PCB redesign?

A: Yes. The BU45K484G-TL uses 3-SSOP packaging (TO-236-3, SC-59, SOT-23-3), while the BD45482G-TR uses 5-SSOP packaging (SC-74A, SOT-753). Both are surface-mount packages with different pin counts and footprints. PCB layout and schematic updates are necessary for physical and electrical integration.

Q: How do the moisture sensitivity levels affect component handling?

A: The BU45K484G-TL carries MSL rating 3 (168-hour floor life), requiring controlled storage conditions. The BD45482G-TR carries MSL rating 1 (unlimited floor life), providing greater flexibility in storage and assembly scheduling without moisture bake-out procedures.

Q: Are both parts compliant with current regulatory standards?

A: Both the BU45K484G-TL and BD45482G-TR are ROHS3 compliant and REACH unaffected. Both support industrial and commercial applications with current regulatory requirements.