BU46K442G-TL Equivalent & Substitute Parts

Part Overview

The BU46K442G-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. The BU46K442G-TL is packaged in a 3-SSOP (TO-236-3, SC-59, SOT-23-3) surface mount configuration and is ROHS3 compliant.

Substiute Parts

BU46K442G-TL

Rohm SemiconductorIn Stock: 890BU46K442G-TL Datasheet

Current PartRFQ

BD46442G-TR

Rohm SemiconductorIn Stock: 888BD46442G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU46K442G-TL is determined by the following critical electrical and mechanical parameters:

Electrical Compatibility Criteria:

• Voltage threshold: 4.4V (must match)
• Output configuration: Push-Pull, Totem Pole (must match)
• Reset function: Active Low (must match)
• Number of voltages monitored: 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 variants (acceptable within same family)

Compliance Requirements:

• RoHS3 compliance (required for modern production)
• REACH unaffected status (required)

The BD46442G-TR meets all electrical compatibility requirements with identical voltage threshold, output configuration, reset function, and operating temperature range. The package transition from 3-SSOP to 5-SSOP represents a physical footprint change that requires PCB layout modification. The reset timeout specification differs (180ms minimum vs. 120ms minimum), which may impact system-level timing behavior depending on application requirements.

Parameter Comparison

Engineering Selection Recommendations

The BD46442G-TR is the manufacturer-recommended substitute for the obsolete BU46K442G-TL. Both components are manufactured by Rohm Semiconductor and maintain identical electrical specifications for voltage threshold, output configuration, reset polarity, and operating temperature range.

Selection of the BD46442G-TR is supported by the following factors:

Product Status: The BD46442G-TR maintains active product status, ensuring long-term availability and manufacturing support compared to the obsolete BU46K442G-TL.

Compliance Certification: Both components are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component procurement.

Moisture Sensitivity: The BD46442G-TR features MSL 1 (unlimited moisture sensitivity level) compared to MSL 3 (168 hours) for the BU46K442G-TL, providing improved handling flexibility during storage and assembly operations.

Package Transition: The shift from 3-SSOP to 5-SSOP packaging requires PCB layout modification. The 5-SSOP package provides additional lead spacing, which may improve manufacturing yield and signal integrity in high-volume production environments.

Reset Timeout Specification: The BD46442G-TR specifies a 180ms minimum reset timeout compared to 120ms for the BU46K442G-TL. System designs dependent on the faster 120ms reset characteristic must validate timing compatibility with the extended 180ms specification.

Frequently Asked Questions (FAQ)

Q: Can the BD46442G-TR be used as a direct pin-for-pin replacement for the BU46K442G-TL?

A: No. While both components are voltage detectors with identical electrical specifications (4.4V threshold, push-pull output, active-low reset), the package transition from 3-SSOP to 5-SSOP requires PCB layout modification. The pin assignments and physical footprints differ between the two packages.

Q: What is the significance of the reset timeout difference (120ms vs. 180ms)?

A: The reset timeout defines the minimum duration the reset output remains asserted after power supply stabilization. The BD46442G-TR's 180ms specification is longer than the BU46K442G-TL's 120ms specification. Applications with timing-critical reset sequencing must verify compatibility with the extended timeout value.

Q: Does the improved moisture sensitivity level (MSL 1 vs. MSL 3) affect component functionality?

A: No. MSL rating affects storage and handling requirements, not electrical performance. MSL 1 (unlimited) provides superior protection against moisture absorption during storage and assembly compared to MSL 3 (168 hours), reducing risk of solder reflow defects.

Q: Are both components suitable for the same operating temperature range?

A: Yes. Both the BU46K442G-TL and BD46442G-TR operate across -40°C to 105°C, meeting identical temperature specifications.

Q: What packaging format is the BD46442G-TR supplied in?

A: The BD46442G-TR is supplied in Tape & Reel (TR) format, suitable for automated assembly operations. The BU46K442G-TL packaging format was not specified in the available documentation.

Q: Are there any compliance or certification differences between these components?

A: Both components are ROHS3 compliant and REACH unaffected. No compliance or certification differences exist between the two parts.