BU46L404G-TL Equivalent & Substitute Parts

Part Overview

The BU46L404G-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 device with active-low reset functionality. The part is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

BU46L404G-TL

Rohm SemiconductorIn Stock: 737BU46L404G-TL Datasheet

Current PartRFQ

BD46405G-TR

Rohm SemiconductorIn Stock: 3012BD46405G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU46L404G-TL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage threshold: 4V (must match)
• Output configuration: Push-Pull, Totem Pole (must match)
• Reset polarity: Active Low (must match)
• Number of monitored channels: 1 (must match)
• Operating temperature range: -40°C ~ 105°C (must match or exceed)

Mechanical Compatibility Criteria:

• Mounting type: Surface Mount (must match)
• Package classification: SSOP-based packages (compatible)

Compliance & Status Criteria:

• RoHS3 compliance required
• REACH unaffected status required

The BD46405G-TR meets all electrical compatibility requirements while offering improved characteristics in reset timeout performance and moisture sensitivity rating. Both components share identical voltage threshold, output configuration, reset polarity, and operating temperature specifications.

Parameter Comparison

Engineering Selection Recommendations

The BD46405G-TR is the manufacturer-recommended substitute for the obsolete BU46L404G-TL. Both components maintain identical electrical specifications for voltage threshold, output configuration, reset polarity, and operating temperature range, ensuring functional compatibility in existing circuit designs.

The BD46405G-TR offers the following advantages:

• Active product status ensures long-term availability and supply chain continuity
• Improved moisture sensitivity rating (MSL 1 vs. MSL 3) reduces handling and storage constraints
• Faster reset timeout (45ms vs. 240ms minimum) may provide improved system response characteristics
• Both components maintain ROHS3 compliance and REACH unaffected status

Package differences exist between the two parts: the BU46L404G-TL uses 3-SSOP (SOT-23-3) packaging, while the BD46405G-TR uses 5-SSOP (SOT-753) packaging. PCB layout modifications are required to accommodate the different pin configurations and package footprints.

Frequently Asked Questions (FAQ)

Q: Can the BD46405G-TR be used as a direct pin-for-pin replacement for the BU46L404G-TL?

A: No. While both components are electrically compatible, they use different package types (3-SSOP vs. 5-SSOP). PCB redesign is required to accommodate the different footprints and pin configurations.

Q: What are the key electrical differences between these two parts?

A: The electrical specifications are identical for voltage threshold (4V), output configuration (push-pull, totem pole), reset polarity (active low), and operating temperature range (-40°C ~ 105°C). The primary difference is reset timeout: the BD46405G-TR has a 45ms minimum timeout compared to 240ms for the BU46L404G-TL.

Q: Why is the BU46L404G-TL obsolete?

A: The BU46L404G-TL is classified as obsolete by the manufacturer. The BD46405G-TR is the active replacement product recommended by Rohm Semiconductor.

Q: Are there any compliance or certification concerns with substitution?

A: Both components maintain ROHS3 compliance and REACH unaffected status. No compliance barriers exist for substitution.

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

A: The BU46L404G-TL has MSL 3 (168-hour moisture sensitivity limit), while the BD46405G-TR has MSL 1 (unlimited). The substitute part has less stringent moisture handling requirements, simplifying storage and assembly processes.

Q: What packaging considerations should be addressed during redesign?

A: The BU46L404G-TL uses SOT-23-3 packaging (3-SSOP), while the BD46405G-TR uses SOT-753 packaging (5-SSOP). The substitute part has additional pins and a different footprint. PCB layout, schematic, and assembly documentation must be updated accordingly.