BU45L302G-TL Equivalent & Substitute Parts

Part Overview

The BU45L302G-TL is a voltage detector supervisor IC from Rohm Semiconductor designed for power management applications. This single-channel open drain supervisor monitors a 3V threshold and provides active low reset output with a 120ms minimum timeout. The device is packaged in a 3-SSOP (SC-59, SOT-23-3) surface mount configuration.

The BU45L302G-TL is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications currently using this component.

Substiute Parts

BU45L302G-TL

Rohm SemiconductorIn Stock: 1123BU45L302G-TL Datasheet

Current PartRFQ

BD45302G-TR

Rohm SemiconductorIn Stock: 4977BD45302G-TR Datasheet

MFR RecommendedRFQ

BU45K302G-TL

Rohm SemiconductorIn Stock: 2527BU45K302G-TL Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the BU45L302G-TL is determined by the following critical parameters:

• Single-channel voltage detection at 3V threshold
• Open drain or open collector output configuration
• Active low reset logic
• Surface mount technology
• Operating temperature range of -40°C to 105°C
• ROHS3 compliance and REACH unaffected status

Two substitute parts meet these core functional and compliance requirements:

BU45K302G-TL (Parametric Equivalent): Maintains identical electrical specifications including 120ms reset timeout, 3-SSOP package, and all compliance certifications. Differs only in product status classification.

BD45302G-TR (Manufacturer Recommended): Provides equivalent voltage detection and reset functionality with identical threshold and operating temperature range. Differs in package configuration (5-SSOP vs. 3-SSOP) and reset timeout specification (180ms vs. 120ms minimum).

Parameter Comparison

Engineering Selection Recommendations

BU45K302G-TL is the closest parametric equivalent to the BU45L302G-TL. It maintains identical electrical specifications, package configuration, and reset timing characteristics. Both devices share the same 3-SSOP package footprint, enabling direct board-level substitution without layout modifications. The primary distinction is product status: BU45K302G-TL is classified as "Not For New Designs," indicating limited future availability. This part is suitable for sustaining production of existing designs where component inventory is available.

BD45302G-TR is the manufacturer-recommended substitute and carries active product status from Rohm Semiconductor. This part maintains functional equivalence in voltage detection, threshold, output configuration, and operating temperature range. However, two design considerations apply: the package changes from 3-SSOP to 5-SSOP, requiring PCB layout verification and potential footprint adjustment; the reset timeout increases from 120ms to 180ms minimum, which may affect system timing behavior depending on application requirements. BD45302G-TR offers superior long-term availability and improved moisture handling (MSL 1 vs. MSL 3).

Both substitutes maintain full ROHS3 compliance and REACH unaffected status, ensuring regulatory alignment with the original part.

Frequently Asked Questions (FAQ)

Q: Can BU45K302G-TL be used as a direct replacement for BU45L302G-TL?

A: Yes. BU45K302G-TL is a parametric equivalent with identical electrical specifications, package type (3-SSOP), and reset timeout (120ms). No circuit modifications or board layout changes are required. The primary consideration is product availability, as BU45K302G-TL is classified as "Not For New Designs."

Q: What are the key differences between BU45L302G-TL and BD45302G-TR?

A: Both devices provide 1-channel voltage detection at 3V with active low reset and open drain output. The differences are: package configuration (3-SSOP vs. 5-SSOP), reset timeout (120ms vs. 180ms minimum), and moisture sensitivity level (MSL 3 vs. MSL 1). BD45302G-TR is the active product with better long-term availability.

Q: Does the package change from 3-SSOP to 5-SSOP require PCB redesign?

A: Package footprint changes require PCB layout verification. The 5-SSOP package has a different pin configuration and physical dimensions compared to 3-SSOP. Board-level compatibility must be confirmed before implementation.

Q: Will the 180ms reset timeout of BD45302G-TR affect my application?

A: The reset timeout difference (120ms vs. 180ms) may impact system behavior if timing-critical functions depend on the original 120ms specification. Application-level timing analysis is necessary to determine compatibility.

Q: Are all three parts compliant with current regulatory standards?

A: Yes. All three parts are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic components.

Q: Which substitute should I select for new designs?

A: BD45302G-TR is the recommended choice for new designs. It carries active product status from Rohm Semiconductor, ensuring long-term availability and supply chain stability. Design considerations include package footprint verification and reset timeout validation against application requirements.