BU45K412G-TL Equivalent & Substitute Parts

Part Overview

The BU45K412G-TL is a voltage detector supervisor IC manufactured by Rohm Semiconductor, designed for single-channel voltage monitoring applications. This component operates as an open drain or open collector output device 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 BU45K412G-TL is packaged in a 3-SSOP (TO-236-3, SC-59, SOT-23-3) surface mount configuration.

Substiute Parts

BU45K412G-TL

Rohm SemiconductorIn Stock: 833BU45K412G-TL Datasheet

Current PartRFQ

BD45395G-TR

Rohm SemiconductorIn Stock: 894BD45395G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU45K412G-TL is determined by the following critical parameters:

• Single-channel voltage monitoring capability
• Open drain or open collector output configuration
• Active low reset signal
• Operating temperature range compatibility (-40°C ~ 105°C)
• Surface mount technology
• ROHS3 compliance and REACH unaffected status

The BD45395G-TR qualifies as a manufacturer-recommended substitute based on functional equivalence in voltage detection and output characteristics. Both components share identical output topology, reset polarity, and environmental compliance certifications. Differences in voltage threshold (4.1V vs. 3.9V), reset timeout duration (120ms vs. 45ms), package form factor (3-SSOP vs. 5-SSOP), and moisture sensitivity level represent design trade-offs that must be evaluated within the context of the specific application circuit.

Parameter Comparison

Engineering Selection Recommendations

The BD45395G-TR is the manufacturer-recommended substitute for the obsolete BU45K412G-TL. Both components maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment for new designs and production transitions.

The BD45395G-TR offers the advantage of active product status, providing improved long-term availability and supply chain stability compared to the obsolete BU45K412G-TL. The substitute component features superior moisture sensitivity characteristics (MSL 1 vs. MSL 3), reducing handling and storage constraints during manufacturing.

Circuit designers must account for the voltage threshold differential (3.9V vs. 4.1V) and reset timeout variation (45ms vs. 120ms) when implementing the BD45395G-TR as a replacement. The transition from 3-SSOP to 5-SSOP packaging requires PCB layout modification and may necessitate schematic review to confirm pin compatibility and functional equivalence within the target application.

Frequently Asked Questions (FAQ)

Q: Can the BD45395G-TR be used as a direct pin-for-pin replacement for the BU45K412G-TL?

A: No. While both components provide single-channel voltage detection with open drain output and active low reset, the package transition from 3-SSOP to 5-SSOP requires PCB layout changes. Pin assignments must be verified against manufacturer datasheets before implementation.

Q: What is the significance of the voltage threshold difference between these parts?

A: The BU45K412G-TL monitors at 4.1V while the BD45395G-TR monitors at 3.9V. This 0.2V differential affects the voltage level at which the supervisor triggers a reset condition. Application circuits must be designed to accommodate the specific threshold of the selected component.

Q: How does the reset timeout difference impact circuit operation?

A: The BU45K412G-TL provides a 120ms minimum reset timeout, while the BD45395G-TR provides 45ms minimum. The reset timeout determines the duration of the active low reset pulse. Longer timeout periods provide extended reset assertion, which may be required for certain microcontroller or system initialization sequences.

Q: Why is the BD45395G-TR classified as active while the BU45K412G-TL is obsolete?

A: Product status reflects manufacturer support and availability. The BU45K412G-TL has reached end-of-life status, limiting future procurement options. The BD45395G-TR remains in active production, ensuring continued availability for new designs and production requirements.

Q: What are the implications of the moisture sensitivity level difference?

A: The BU45K412G-TL carries MSL 3 (168-hour limit), requiring controlled storage and handling conditions. The BD45395G-TR carries MSL 1 (unlimited), eliminating moisture sensitivity constraints and reducing manufacturing process complexity.

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

A: Both components maintain identical ROHS3 compliance and REACH unaffected status. No regulatory or certification barriers exist for substitution from a compliance perspective.