BU45L272G-TL Equivalent & Substitute Parts

Part Overview

The BU45L272G-TL is a voltage supervisor IC from Rohm Semiconductor designed for single-channel voltage monitoring applications. This device features an open drain or open collector output with active low reset functionality and a 120ms minimum reset timeout. The part is classified as obsolete, making identification of suitable alternatives essential for ongoing production and design continuity.

Key Parameters

Parameter	Value
Manufacturer	Rohm Semiconductor
Category	Power Management (PMIC)
Type	Voltage Detector
Number of Voltages Monitored	1
Voltage - Threshold	2.7V
Output Type	Open Drain or Open Collector
Reset	Active Low
Reset Timeout	120ms Minimum
Operating Temperature Range	-40°C ~ 105°C (TA)
Mounting Type	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	3-SSOP
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitute parts for the BU45L272G-TL are identified based on the following critical parameters that determine functional and mechanical compatibility:

Core Electrical Parameters:

Single-channel voltage monitoring capability
2.7V voltage threshold
Open drain or open collector output configuration
Active low reset signal
Operating temperature range of -40°C to 105°C

Mechanical & Packaging Parameters:

Surface mount technology
3-pin or 5-pin SSOP package variants
RoHS3 compliance
REACH unaffected status

The two substitute parts identified maintain these core electrical specifications while differing in package configuration, reset timeout characteristics, and product lifecycle status.

Parameter Comparison

Parameter	BU45L272G-TL (Main)	BD45272G-TR (Substitute)	BU45K272G-TL (Substitute)
Manufacturer	Rohm Semiconductor	Rohm Semiconductor	Rohm Semiconductor
Type	Voltage Detector	Voltage Detector	Voltage Detector
Number of Voltages Monitored	1	1	1
Voltage - Threshold	2.7V	2.7V	2.7V
Output Type	Open Drain or Open Collector	Open Drain or Open Collector	Open Drain or Open Collector
Reset	Active Low	Active Low	Active Low
Reset Timeout	120ms Minimum	180ms Minimum	120ms Minimum
Operating Temperature Range	-40°C ~ 105°C (TA)	-40°C ~ 105°C (TA)	-40°C ~ 105°C (TA)
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Package / Case	TO-236-3, SC-59, SOT-23-3	SC-74A, SOT-753	TO-236-3, SC-59, SOT-23-3
Supplier Device Package	3-SSOP	5-SSOP	3-SSOP
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	3 (168 Hours)	1 (Unlimited)	3 (168 Hours)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected
Product Status	Obsolete	Active	Not For New Designs

Engineering Selection Recommendations

BD45272G-TR is the manufacturer-recommended substitute. This part maintains all core electrical parameters including the 2.7V threshold, active low reset, and single-channel monitoring capability. The primary differences are the 5-SSOP package configuration (versus 3-SSOP) and an extended reset timeout of 180ms minimum (versus 120ms). The BD45272G-TR carries active product status and superior moisture sensitivity characteristics (MSL 1 versus MSL 3), making it suitable for new production designs. PCB layout modifications are required to accommodate the 5-pin package.

BU45K272G-TL is a parametric equivalent substitute. This part maintains identical electrical specifications including the 120ms reset timeout and 3-SSOP package configuration, eliminating the need for PCB redesign. However, this part carries a "Not For New Designs" status, limiting its applicability to legacy production or maintenance scenarios where existing board layouts must be preserved.

Both substitutes maintain full RoHS3 compliance and REACH unaffected status, ensuring regulatory continuity with the original BU45L272G-TL.

Frequently Asked Questions (FAQ)

Q: Can BD45272G-TR be used as a direct pin-for-pin replacement? A: No. The BD45272G-TR uses a 5-SSOP package compared to the 3-SSOP package of the BU45L272G-TL. PCB layout modifications are required to accommodate the additional pins and different pin configuration.

Q: What is the significance of the reset timeout difference between BU45L272G-TL (120ms) and BD45272G-TR (180ms)? A: The reset timeout defines the minimum duration the reset output remains active after a voltage threshold violation is detected. The BD45272G-TR's 180ms timeout is longer than the original 120ms specification. System timing requirements must be evaluated to determine if this difference affects circuit operation.

Q: Is BU45K272G-TL suitable for new product designs? A: No. The BU45K272G-TL carries a "Not For New Designs" status and should be used only for legacy production or maintenance applications where design continuity is required.

Q: What are the moisture sensitivity implications of selecting BD45272G-TR? A: The BD45272G-TR has MSL 1 (unlimited moisture exposure tolerance) compared to the BU45L272G-TL's MSL 3 (168-hour limit). This provides superior protection against moisture-related failures during storage and handling, particularly beneficial for extended supply chain timelines.

Q: Are all three parts RoHS3 compliant? A: Yes. The BU45L272G-TL, BD45272G-TR, and BU45K272G-TL are all ROHS3 compliant and REACH unaffected, ensuring regulatory compliance across all substitution options.

Q: Which substitute should be selected for new production? A: The BD45272G-TR is the manufacturer-recommended choice for new production due to its active product status and superior moisture sensitivity rating. Design modifications to accommodate the 5-SSOP package are required.

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