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BU45L454G-TL Equivalent & Substitute Parts
Part Overview
The BU45L454G-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.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Category | Power Management (PMIC) |
| Type | Voltage Detector |
| Number of Voltages Monitored | 1 |
| Voltage Threshold | 4.5V |
| Output Type | Open Drain or Open Collector |
| Reset Function | Active Low |
| Operating Temperature Range | -40°C ~ 105°C (TA) |
| Mounting Type | Surface Mount |
| Package Type | TO-236-3, SC-59, SOT-23-3 |
| RoHS Status | ROHS3 Compliant |
| REACH Status | REACH Unaffected |
Substitute Part Grouping Explanation
Substitution of the BU45L454G-TL is determined by the following critical parameters:
- Single-channel voltage monitoring capability
- 4.5V voltage threshold setting
- Open drain or open collector output configuration
- Active low reset signal polarity
- Surface mount technology compatibility
- Operating temperature range of -40°C to 105°C
- RoHS3 and REACH compliance status
The BD45455G-TR qualifies as a substitute based on matching all core functional parameters. Both devices maintain identical voltage threshold, output type, reset polarity, temperature range, and regulatory compliance. Package differences exist between the two components, requiring mechanical verification during integration.
Parameter Comparison
| Parameter | BU45L454G-TL | BD45455G-TR |
|---|---|---|
| Manufacturer | Rohm Semiconductor | Rohm Semiconductor |
| Type | Voltage Detector | Voltage Detector |
| Number of Voltages Monitored | 1 | 1 |
| Voltage Threshold | 4.5V | 4.5V |
| Output Type | Open Drain or Open Collector | Open Drain or Open Collector |
| Reset Function | Active Low | Active Low |
| Reset Timeout | 240ms Minimum | 45ms Minimum |
| Operating Temperature | -40°C ~ 105°C (TA) | -40°C ~ 105°C (TA) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | TO-236-3, SC-59, SOT-23-3 | SC-74A, SOT-753 |
| Supplier Device Package | 3-SSOP | 5-SSOP |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| REACH Status | REACH Unaffected | REACH Unaffected |
| Moisture Sensitivity Level | 3 (168 Hours) | 1 (Unlimited) |
| Product Status | Obsolete | Active |
Engineering Selection Recommendations
The BD45455G-TR is the manufacturer-recommended substitute for the obsolete BU45L454G-TL. Both components maintain functional equivalence across all critical voltage supervision parameters, including threshold voltage, output configuration, and reset behavior.
The BD45455G-TR offers the advantage of active product status, ensuring continued availability and manufacturing support. This component carries identical RoHS3 and REACH compliance certifications, meeting regulatory requirements for new designs and legacy system support.
Package differences require mechanical evaluation. The BU45L454G-TL uses 3-SSOP packaging (SOT-23-3), while the BD45455G-TR uses 5-SSOP packaging (SOT-753). Pin configuration and board layout modifications may be necessary during integration.
The BD45455G-TR demonstrates improved moisture sensitivity characteristics (MSL 1 versus MSL 3), providing enhanced reliability in humid storage and operational environments.
Frequently Asked Questions (FAQ)
Q: Can the BD45455G-TR directly replace the BU45L454G-TL without circuit modifications?
A: Functional substitution is possible based on matching voltage threshold, output type, and reset polarity. However, package differences (3-SSOP versus 5-SSOP) require PCB layout and footprint modifications. Pin-to-pin compatibility must be verified against specific pinout documentation.
Q: What is the significance of the reset timeout difference between these components?
A: The BU45L454G-TL specifies 240ms minimum reset timeout, while the BD45455G-TR specifies 45ms minimum. This parameter defines the duration the reset signal remains active after voltage threshold detection. System timing requirements must accommodate the shorter timeout of the substitute component.
Q: Are there any compliance or regulatory differences between these parts?
A: Both components maintain identical RoHS3 and REACH compliance status. No regulatory barriers exist for substitution in applications requiring these certifications.
Q: What does the moisture sensitivity level difference indicate?
A: The BU45L454G-TL carries MSL 3 (168-hour limit), while the BD45455G-TR carries MSL 1 (unlimited). MSL 1 indicates superior moisture resistance and more flexible storage and handling conditions. The substitute component offers improved environmental tolerance.
Q: Is the BD45455G-TR available in the same packaging options as the BU45L454G-TL?
A: No. The BU45L454G-TL uses TO-236-3/SC-59/SOT-23-3 packaging, while the BD45455G-TR uses SC-74A/SOT-753 packaging. These are distinct package families requiring separate PCB footprints and design considerations.
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