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BU45K482G-TL Equivalent & Substitute Parts
Part Overview
The BU45K482G-TL is a voltage supervisor IC manufactured by 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 BU45K482G-TL is classified as obsolete, making identification of suitable substitute components essential for ongoing design support and production continuity. The part is packaged in a 3-SSOP (TO-236-3, SC-59, SOT-23-3) surface mount configuration and is ROHS3 compliant.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Rohm Semiconductor |
| Category | Power Management (PMIC) |
| Type | Voltage Detector |
| Number of Voltages Monitored | 1 |
| Voltage - Threshold | 4.8V |
| 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 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
Substitute Part Grouping Explanation
Substitution of the BU45K482G-TL is determined by the following critical electrical and mechanical parameters:
Core Functional Parameters:
- Voltage threshold: 4.8V (must match)
- Output configuration: Open Drain or Open Collector (must match)
- Reset polarity: Active Low (must match)
- Number of channels: 1 (must match)
- Operating temperature range: -40°C ~ 105°C (must match or exceed)
Mechanical Compatibility:
- Mounting type: Surface Mount (must match)
- Package family: SSOP variants acceptable (3-SSOP or 5-SSOP)
Compliance Requirements:
- RoHS3 compliance required
- REACH unaffected status required
The BD45482G-TR qualifies as a direct substitute based on matching all core functional parameters and compliance requirements. While the package changes from 3-SSOP to 5-SSOP and the reset timeout increases from 120ms to 180ms minimum, these variations remain within acceptable substitution criteria for voltage supervisor applications.
Parameter Comparison
| Parameter | BU45K482G-TL (Main Part) | BD45482G-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 | 4.8V | 4.8V |
| Output Type | Open Drain or Open Collector | Open Drain or Open Collector |
| Reset | Active Low | Active Low |
| Reset Timeout | 120ms Minimum | 180ms Minimum |
| Operating Temperature Range | -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 |
| Product Status | Obsolete | Active |
| RoHS Status | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 3 (168 Hours) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
| ECCN | EAR99 | EAR99 |
| HTSUS | 8542.39.0001 | 8542.39.0001 |
Engineering Selection Recommendations
The BD45482G-TR is the manufacturer-recommended substitute for the obsolete BU45K482G-TL. Both components maintain identical voltage threshold (4.8V), output configuration (open drain or open collector), reset polarity (active low), and operating temperature range (-40°C ~ 105°C). Both are ROHS3 compliant and REACH unaffected.
The BD45482G-TR offers improved product status (active versus obsolete), ensuring long-term availability and supply chain stability. The component also provides superior moisture sensitivity characteristics (MSL 1 versus MSL 3), reducing handling and storage constraints.
Package transition from 3-SSOP to 5-SSOP requires PCB layout modification. The reset timeout specification increases from 120ms to 180ms minimum; this parameter difference must be evaluated against application timing requirements.
Frequently Asked Questions (FAQ)
Q: Can the BD45482G-TR directly replace the BU45K482G-TL without circuit modifications?
A: Electrical functionality is directly compatible. However, the package change from 3-SSOP to 5-SSOP requires PCB footprint redesign. The increased reset timeout (180ms versus 120ms) must be evaluated for application compatibility.
Q: What is the significance of the package change from 3-SSOP to 5-SSOP?
A: The 5-SSOP package provides additional pins and improved thermal characteristics. PCB layout and routing must be updated to accommodate the new footprint. Pin assignments should be verified against the respective datasheets.
Q: Why does the BD45482G-TR have a longer reset timeout?
A: The reset timeout specification is a design parameter of the BD45482G-TR device. Applications requiring the original 120ms timeout must evaluate whether the 180ms minimum specification is acceptable for system operation.
Q: Is the moisture sensitivity level difference significant?
A: The BD45482G-TR has MSL 1 (unlimited moisture exposure) compared to the BU45K482G-TL MSL 3 (168 hours). This represents improved handling flexibility and reduced storage constraints for the substitute component.
Q: Are both components RoHS3 compliant?
A: Yes, both the BU45K482G-TL and BD45482G-TR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.
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