BU46L454G-TL Equivalent & Substitute Parts

Part Overview

The BU46L454G-TL is a voltage detector supervisor IC manufactured by Rohm Semiconductor, designed for single-channel voltage monitoring applications. This component operates as a push-pull, totem pole output supervisor with active low reset functionality. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity.

Substiute Parts

BU46L454G-TL

Rohm SemiconductorIn Stock: 1228BU46L454G-TL Datasheet

Current PartRFQ

BD46455G-TR

Rohm SemiconductorIn Stock: 3802BD46455G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU46L454G-TL is determined by the following critical parameters:

• Voltage Threshold: 4.5V (must match exactly)
• Output Configuration: Push-Pull, Totem Pole (must match exactly)
• Reset Type: Active Low (must match exactly)
• Number of Voltages Monitored: 1 channel (must match exactly)
• Operating Temperature Range: -40°C ~ 105°C (must match or exceed)
• Mounting Type: Surface Mount (must match)
• RoHS Compliance: ROHS3 Compliant (must maintain compliance level)

The BD46455G-TR meets all critical electrical and functional parameters required for substitution. While package variants differ (3-SSOP versus 5-SSOP), both are surface-mount configurations compatible with standard PCB assembly processes. The reset timeout differs between parts (240ms minimum for BU46L454G-TL versus 45ms minimum for BD46455G-TR), representing a functional improvement in the substitute component.

Parameter Comparison

Engineering Selection Recommendations

The BD46455G-TR is the manufacturer-recommended substitute for the obsolete BU46L454G-TL. Both components maintain identical electrical specifications for voltage threshold, output configuration, reset polarity, and operating temperature range. The substitute component offers active product status, ensuring long-term availability and supply chain stability.

The BD46455G-TR provides improved moisture sensitivity characteristics (MSL 1 versus MSL 3), reducing handling and storage constraints during manufacturing. The faster reset timeout (45ms versus 240ms) represents a functional enhancement suitable for applications requiring quicker system response.

Package transition from 3-SSOP to 5-SSOP requires PCB layout modification. Both packages are standard surface-mount configurations with established assembly compatibility. Design validation is necessary to confirm footprint accommodation and thermal performance in the target application.

Frequently Asked Questions (FAQ)

Q: Can BD46455G-TR directly replace BU46L454G-TL without circuit modification?

A: Electrical substitution is valid based on matching voltage threshold (4.5V), output configuration (push-pull, totem pole), reset polarity (active low), and operating temperature range. PCB layout modification is required due to package change from 3-SSOP to 5-SSOP.

Q: What is the significance of the reset timeout difference?

A: The BU46L454G-TL specifies 240ms minimum reset timeout, while BD46455G-TR specifies 45ms minimum. This difference affects system startup timing. Applications dependent on the longer timeout require circuit redesign or timing validation.

Q: Does the moisture sensitivity level change affect component handling?

A: Yes. The BD46455G-TR has MSL 1 (unlimited shelf life), compared to BU46L454G-TL MSL 3 (168-hour limit). This improvement reduces storage and handling constraints during manufacturing and assembly operations.

Q: Are both components RoHS and REACH compliant?

A: Both BU46L454G-TL and BD46455G-TR are ROHS3 compliant and REACH unaffected, maintaining regulatory compliance for industrial and commercial applications.

Q: What package considerations apply to this substitution?

A: The main part uses 3-SSOP (TO-236-3, SC-59, SOT-23-3) packaging. The substitute uses 5-SSOP (SC-74A, SOT-753) packaging. PCB footprint redesign is mandatory. Both are surface-mount packages compatible with standard reflow assembly processes.