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BU45L342G-TL Equivalent & Substitute Parts
Part Overview
The BU45L342G-TL is a voltage supervisor IC from Rohm Semiconductor designed for single-channel voltage monitoring applications. This component functions as a voltage detector with open drain or open collector output, providing active low reset functionality. The device is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations. The BU45L342G-TL operates across the industrial temperature range of -40°C to 105°C and is packaged in a 3-SSOP configuration.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Category | Power Management (PMIC) |
| Type | Voltage Detector |
| Number of Voltages Monitored | 1 |
| Voltage Threshold | 3.4V |
| Output Type | Open Drain or Open Collector |
| Reset Function | Active Low |
| Operating Temperature Range | -40°C to 105°C |
| Mounting Type | Surface Mount |
| Package Type | 3-SSOP (TO-236-3, SC-59, SOT-23-3) |
| RoHS Status | ROHS3 Compliant |
Substitute Part Grouping Explanation
Substitution of the BU45L342G-TL is determined by the following critical parameters:
- Single-channel voltage monitoring capability
- 3.4V voltage threshold setting
- Open drain or open collector output configuration
- Active low reset signal polarity
- Surface mount technology compatibility
- Industrial temperature range operation (-40°C to 105°C)
- ROHS3 compliance and REACH unaffected status
The BD45342G-TR qualifies as a manufacturer-recommended substitute based on matching these core functional and electrical parameters. Both devices maintain identical voltage threshold, output type, reset polarity, and operating temperature specifications. Differences in package configuration (3-SSOP versus 5-SSOP), reset timeout duration, and moisture sensitivity level do not prevent functional substitution when layout and thermal management considerations are addressed.
Parameter Comparison
| Parameter | BU45L342G-TL (Main Part) | BD45342G-TR (Substitute) |
|---|---|---|
| Manufacturer | Rohm Semiconductor | Rohm Semiconductor |
| Category | Power Management (PMIC) | Power Management (PMIC) |
| Type | Voltage Detector | Voltage Detector |
| Number of Voltages Monitored | 1 | 1 |
| Voltage Threshold | 3.4V | 3.4V |
| Output Type | Open Drain or Open Collector | Open Drain or Open Collector |
| Reset Function | Active Low | Active Low |
| Reset Timeout | 120ms Minimum | 180ms Minimum |
| Operating Temperature Range | -40°C to 105°C | -40°C to 105°C |
| Mounting Type | Surface Mount | Surface Mount |
| Package Type | 3-SSOP (TO-236-3, SC-59, SOT-23-3) | 5-SSOP (SC-74A, SOT-753) |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The BD45342G-TR is the manufacturer-recommended substitute for the obsolete BU45L342G-TL. Both components maintain identical electrical specifications for voltage threshold, output configuration, and reset polarity. The substitute part carries active product status, ensuring long-term availability and supply chain continuity.
Both devices satisfy ROHS3 compliance and REACH unaffected requirements, supporting regulatory obligations in manufacturing and distribution. The BD45342G-TR offers improved moisture sensitivity classification (MSL 1 versus MSL 3), providing enhanced reliability in humid storage and operational environments.
Package reconfiguration from 3-SSOP to 5-SSOP requires PCB layout modification. The extended reset timeout of the substitute (180ms minimum versus 120ms minimum) must be evaluated against system reset timing requirements. These differences do not affect core voltage detection functionality when properly integrated into the target application.
Frequently Asked Questions (FAQ)
Q: Can the BD45342G-TR directly replace the BU45L342G-TL without circuit modifications?
A: Electrical substitution is valid based on matching voltage threshold, output type, and reset polarity. Physical substitution requires PCB layout changes due to different package configurations (3-SSOP versus 5-SSOP). Pin assignment verification is mandatory before implementation.
Q: What is the significance of the reset timeout difference between these parts?
A: The BU45L342G-TL specifies 120ms minimum reset timeout, while the BD45342G-TR specifies 180ms minimum. This parameter defines the duration the reset signal remains active after voltage threshold detection. System timing requirements must accommodate the longer timeout of the substitute part.
Q: Does the moisture sensitivity level difference affect substitution suitability?
A: The BD45342G-TR carries MSL 1 (unlimited moisture exposure) compared to the BU45L342G-TL MSL 3 (168 hours). This represents an improvement in environmental robustness. The substitute part provides superior protection against moisture ingress during storage and handling.
Q: Are both parts compliant with current regulatory standards?
A: Both the BU45L342G-TL and BD45342G-TR are ROHS3 compliant and REACH unaffected, meeting current regulatory requirements for electronic component manufacturing and distribution.
Q: Why is the BU45L342G-TL classified as obsolete?
A: Obsolete status indicates the manufacturer has discontinued production. The BD45342G-TR, carrying active product status, represents the current generation equivalent from Rohm Semiconductor for this voltage detector application.
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