NCP302LSN40T1G Equivalent & Substitute Parts

Part Overview

The NCP302LSN40T1G is a single-channel power management supervisor IC manufactured by onsemi, designed for power-on reset and voltage monitoring applications. This device features push-pull totem pole output with a 4V threshold and adjustable reset timeout. The part is classified as obsolete, making equivalent and substitute components necessary for new designs and ongoing production requirements. Substitute parts must maintain functional equivalence in voltage monitoring, output topology, and reset characteristics while accommodating available active alternatives.

Key Parameters

Parameter	Value
Manufacturer Part Number	NCP302LSN40T1G
Manufacturer	onsemi
Category	Power Management (PMIC)
Type	Simple Reset/Power-On Reset
Number of Voltages Monitored	1
Voltage - Threshold	4V
Output	Push-Pull, Totem Pole
Reset	Active Low
Reset Timeout	Adjustable/Selectable
Operating Temperature	-40°C ~ 125°C (TA)
Mounting Type	Surface Mount
Package / Case	SOT-23-5 Thin, TSOT-23-5
Supplier Device Package	5-TSOP
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the NCP302LSN40T1G is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

Single-channel voltage monitoring capability
4V voltage threshold (or equivalent threshold for the application)
Push-pull totem pole output topology
Active low reset signal
Adjustable or selectable reset timeout
Operating temperature range of -40°C to 125°C or higher
Surface mount packaging in 5-pin configuration
ROHS3 compliance and MSL Level 1

Substitute Parts Identified:

BU4340G-TR (Rohm Semiconductor) — Direct functional equivalent with matching voltage threshold (4V), adjustable reset timeout, and identical operating temperature range (-40°C ~ 125°C). Package is 5-SSOP, compatible with 5-pin surface mount requirements.
BD53E42G-MTR (Rohm Semiconductor) — Meets core electrical requirements with 4.2V threshold, push-pull output, and active low reset. Operating temperature range is -40°C ~ 105°C. Includes automotive-grade qualification (AEC-Q100) and Tape & Reel packaging.
BD53E40G-TR (Rohm Semiconductor) — Voltage detector with 4V threshold matching the main part. Operating temperature range is -40°C ~ 105°C. 5-SSOP package configuration.
BD53E41G-TR (Rohm Semiconductor) — Voltage detector with 4.1V threshold. Operating temperature range is -40°C ~ 105°C. 5-SSOP package configuration.

Parameter Comparison

Parameter	NCP302LSN40T1G	BU4340G-TR	BD53E42G-MTR	BD53E40G-TR	BD53E41G-TR
Manufacturer	onsemi	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor
Type	Simple Reset/Power-On Reset	Simple Reset/Power-On Reset	Voltage Detector	Voltage Detector	Voltage Detector
Number of Voltages Monitored	1	1	1	1	1
Voltage - Threshold	4V	4V	4.2V	4V	4.1V
Output	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole	Push-Pull, Totem Pole
Reset	Active Low	Active Low	Active Low	Active Low	Active Low
Reset Timeout	Adjustable/Selectable	Adjustable/Selectable	—	—	—
Operating Temperature	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 105°C	-40°C ~ 105°C	-40°C ~ 105°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	SOT-23-5 Thin, TSOT-23-5	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753	SC-74A, SOT-753
Supplier Device Package	5-TSOP	5-SSOP	5-SSOP	5-SSOP	5-SSOP
Product Status	Obsolete	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	—	—
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	—	—

Engineering Selection Recommendations

BU4340G-TR is the primary substitute for the NCP302LSN40T1G. This part maintains identical electrical specifications including 4V voltage threshold, adjustable reset timeout, and -40°C to 125°C operating temperature range. Both parts are ROHS3 compliant with MSL Level 1 rating. The BU4340G-TR is currently in active production status with 781 units in stock. Package transition from 5-TSOP to 5-SSOP requires PCB layout verification but maintains functional compatibility.

BD53E42G-MTR serves as an alternative for applications where automotive-grade qualification (AEC-Q100) is required. This part meets core electrical requirements with 4.2V threshold and push-pull output. The operating temperature range is -40°C to 105°C, which is suitable for most industrial applications but does not extend to the full 125°C upper limit of the original part. This substitute is available in Tape & Reel packaging with 8690 units in stock.

BD53E40G-TR and BD53E41G-TR are suitable for applications where the exact voltage threshold is not critical. BD53E40G-TR provides 4V threshold matching, while BD53E41G-TR offers 4.1V threshold. Both operate within -40°C to 105°C range. These parts do not feature adjustable reset timeout, limiting their use to fixed-timeout applications.

For designs requiring the full -40°C to 125°C operating range with adjustable reset timeout, BU4340G-TR is the recommended primary substitute.

Frequently Asked Questions (FAQ)

Q: Can BD53E42G-MTR replace NCP302LSN40T1G in all applications?

A: BD53E42G-MTR meets the core electrical requirements of single-channel voltage monitoring with push-pull output and active low reset. However, the operating temperature range is limited to -40°C ~ 105°C compared to the original part's -40°C ~ 125°C. Applications operating above 105°C require BU4340G-TR. Additionally, BD53E42G-MTR does not feature adjustable reset timeout, which may impact designs relying on this functionality.

Q: What is the difference between 5-TSOP and 5-SSOP packaging?

A: Both are 5-pin surface mount packages with similar pin configurations and spacing. The primary difference is in package outline dimensions. 5-TSOP (Thin Small Outline Package) and 5-SSOP (Shrink Small Outline Package) are mechanically compatible in most applications, but PCB footprint verification is required before substitution. Consult device datasheets for exact dimensional specifications.

Q: Why do some substitute parts lack adjustable reset timeout?

A: BD53E40G-TR, BD53E41G-TR, and BD53E42G-MTR are classified as voltage detectors rather than simple reset supervisors. These parts provide fixed reset timeout functionality determined by internal design rather than external adjustment. Applications requiring adjustable or selectable reset timeout must use BU4340G-TR or equivalent simple reset supervisor types.

Q: Is BU4340G-TR fully compatible with NCP302LSN40T1G?

A: BU4340G-TR matches all critical electrical parameters: 4V voltage threshold, push-pull totem pole output, active low reset, adjustable reset timeout, and -40°C ~ 125°C operating temperature range. Both parts are ROHS3 compliant with MSL Level 1. Package transition from 5-TSOP to 5-SSOP requires PCB layout review to confirm pin alignment and footprint compatibility.

Q: Can I use BD53E42G-MTR in automotive applications?

A: BD53E42G-MTR carries AEC-Q100 automotive-grade qualification, making it suitable for automotive applications. However, verify that the 4.2V threshold and -40°C ~ 105°C operating range meet your specific application requirements. The original NCP302LSN40T1G does not carry automotive qualification.

Q: What inventory levels are available for substitute parts?

A: BU4340G-TR has 781 units in stock. BD53E42G-MTR has 8690 units in stock. BD53E40G-TR has 1048 units in stock. BD53E41G-TR has 1043 units in stock. Verify current availability with your supplier before finalizing design decisions.

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