NCP302LSN40T1 Equivalent & Substitute Parts

Part Overview

The NCP302LSN40T1 is a single-channel power management supervisor IC manufactured by onsemi, designed for voltage monitoring and reset signal generation in electronic systems. This device features push-pull, totem pole output configuration with active-low reset and adjustable/selectable reset timeout. The part is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Substiute Parts

NCP302LSN40T1

onsemiIn Stock: 19991NCP302LSN40T1 Datasheet

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BD53E40G-TR

Rohm SemiconductorIn Stock: 1157BD53E40G-TR Datasheet

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BD53E41G-TR

Rohm SemiconductorIn Stock: 1094BD53E41G-TR Datasheet

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BD53E42G-MTR

Rohm SemiconductorIn Stock: 8754BD53E42G-MTR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the NCP302LSN40T1 is determined by the following critical parameters:

• Single-channel voltage monitoring capability with push-pull, totem pole output
• Active-low reset logic configuration
• Voltage threshold matching or compatibility (4V nominal)
• Surface mount packaging in 5-pin configurations
• Operating temperature range compatibility (-40°C minimum to 105°C or higher)
• Product status (active alternatives preferred for new designs)

The substitute parts identified are Rohm Semiconductor devices from the BD53Exx series, which maintain functional equivalence across these core parameters while offering active product status and improved compliance profiles.

Parameter Comparison

Engineering Selection Recommendations

BD53E40G-TR is the closest functional equivalent to the NCP302LSN40T1, matching the 4V voltage threshold exactly. This part maintains active product status and is suitable for applications where the operating temperature range does not exceed 105°C.

BD53E41G-TR provides a 4.1V threshold variant, appropriate for designs requiring slightly elevated voltage detection thresholds while maintaining all other functional characteristics.

BD53E42G-MTR offers the highest voltage threshold at 4.2V and includes automotive-grade qualification (AEC-Q100) with ROHS3 compliance. This variant is recommended for applications requiring enhanced regulatory compliance and automotive-qualified components.

All three Rohm Semiconductor alternatives provide active product status, ensuring long-term availability and supply chain stability compared to the obsolete NCP302LSN40T1.

Frequently Asked Questions (FAQ)

Q: Can BD53E40G-TR directly replace NCP302LSN40T1 in existing designs?

A: BD53E40G-TR maintains functional equivalence in voltage threshold (4V), output configuration (push-pull, totem pole), and reset logic (active low). However, package differences exist: NCP302LSN40T1 uses 5-TSOP (SOT-23-5 Thin) while BD53E40G-TR uses 5-SSOP (SC-74A, SOT-753). Physical PCB layout modifications may be required. Operating temperature range differs: NCP302LSN40T1 supports -40°C to 125°C, while BD53E40G-TR supports -40°C to 105°C. Verify application temperature requirements before substitution.

Q: What is the difference between BD53E40G-TR, BD53E41G-TR, and BD53E42G-MTR?

A: The primary difference is voltage threshold: BD53E40G-TR monitors 4V, BD53E41G-TR monitors 4.1V, and BD53E42G-MTR monitors 4.2V. All three maintain identical output configuration and reset logic. BD53E42G-MTR includes automotive-grade qualification (AEC-Q100) and ROHS3 compliance, making it suitable for regulated applications.

Q: Are there package compatibility considerations?

A: Yes. The NCP302LSN40T1 uses 5-TSOP packaging, while all Rohm Semiconductor alternatives use 5-SSOP packaging. Although both are 5-pin surface mount packages, pin spacing and footprint dimensions differ. PCB redesign or adapter solutions may be necessary for direct substitution.

Q: Which substitute part is recommended for new designs?

A: BD53E42G-MTR is recommended for new designs due to active product status, automotive-grade qualification, and ROHS3 compliance. For applications not requiring automotive qualification, BD53E40G-TR provides the closest voltage threshold match to the original NCP302LSN40T1.

Q: What compliance differences exist between the main part and substitutes?

A: NCP302LSN40T1 is RoHS non-compliant. BD53E42G-MTR is ROHS3 compliant with AEC-Q100 automotive qualification. BD53E40G-TR and BD53E41G-TR compliance status is not specified in available data. For regulated applications, BD53E42G-MTR is the appropriate choice.