BU46K342G-TL Equivalent & Substitute Parts

Part Overview

The BU46K342G-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 BU46K342G-TL is packaged in a 3-SSOP (TO-236-3, SC-59, SOT-23-3) surface mount configuration with a 3.4V threshold voltage and 120ms minimum reset timeout.

Substiute Parts

BU46K342G-TL

Rohm SemiconductorIn Stock: 1194BU46K342G-TL Datasheet

Current PartRFQ

BD46342G-TR

Rohm SemiconductorIn Stock: 802BD46342G-TR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BU46K342G-TL is determined by strict alignment of the following critical electrical and mechanical parameters:

• Single-channel voltage monitoring capability
• 3.4V threshold voltage
• Push-pull, totem pole output configuration
• Active low reset functionality
• Surface mount technology
• Operating temperature range of -40°C to 105°C
• ROHS3 compliance and REACH unaffected status

The BD46342G-TR qualifies as a manufacturer-recommended substitute based on identical electrical specifications across all monitored voltages, output type, reset polarity, and operating temperature range. Both components maintain equivalent functional performance for single-channel voltage detection applications. Differences in packaging format (3-SSOP versus 5-SSOP), reset timeout duration (120ms versus 180ms minimum), and moisture sensitivity classification do not preclude substitution when circuit design accommodates these variations.

Parameter Comparison

Engineering Selection Recommendations

The BD46342G-TR is the manufacturer-recommended substitute for the obsolete BU46K342G-TL. Both components maintain identical electrical performance for single-channel voltage detection at 3.4V threshold with push-pull, totem pole output and active low reset operation across the full -40°C to 105°C temperature range.

The BD46342G-TR offers the advantage of active product status, ensuring long-term availability and supply chain continuity. Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for current manufacturing standards.

The primary design consideration is the package transition from 3-SSOP to 5-SSOP, which requires PCB layout modification. The reset timeout specification increases from 120ms to 180ms minimum; circuit designs must verify that this extended timeout remains acceptable for the intended application. The BD46342G-TR provides superior moisture handling with MSL 1 (unlimited) compared to MSL 3 (168 hours) of the original part, reducing moisture-related reliability risks during storage and assembly.

Frequently Asked Questions (FAQ)

Q: Can the BD46342G-TR directly replace the BU46K342G-TL without circuit modification?

A: Electrical substitution is valid based on identical threshold voltage, output configuration, reset polarity, and operating temperature range. However, PCB layout modification is required due to package format change from 3-SSOP to 5-SSOP. The extended reset timeout (180ms versus 120ms) must be evaluated for circuit compatibility.

Q: What is the significance of the package change from 3-SSOP to 5-SSOP?

A: The 3-SSOP package (TO-236-3, SC-59, SOT-23-3) contains three pins, while the 5-SSOP package (SC-74A, SOT-753) contains five pins. This requires redesign of the PCB footprint and trace routing. Pin assignment and functionality must be verified against the respective datasheets before implementation.

Q: Does the increased reset timeout of the BD46342G-TR affect circuit performance?

A: The reset timeout increase from 120ms to 180ms minimum extends the time required for the supervisor to release the reset signal after power supply stabilization. Applications with strict reset timing requirements must confirm that the longer timeout remains within acceptable system parameters.

Q: Are both parts compliant with current regulatory standards?

A: Yes. Both the BU46K342G-TL and BD46342G-TR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements for electronic component manufacturing and use.

Q: What advantage does the BD46342G-TR offer regarding moisture sensitivity?

A: The BD46342G-TR carries MSL 1 (unlimited moisture sensitivity level) compared to MSL 3 (168 hours) for the BU46K342G-TL. This indicates superior moisture resistance and reduced risk of moisture-induced failures during storage, handling, and assembly processes.