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LM2611AMFX Equivalent & Substitute Parts
Part Overview
The LM2611AMFX is a Cuk Switching Regulator IC from Texas Instruments designed for negative adjustable voltage regulation with 1.2A output current capability. This component operates across an input voltage range of 2.7V to 14V and delivers adjustable negative output voltage from -1.23V to -32V at a switching frequency of 1.4MHz. The device is packaged in SC-74A (SOT-753) surface mount configuration.
The LM2611AMFX carries an Obsolete product status. Identifying equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production requirements for applications utilizing this negative voltage regulation topology.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Texas Instruments |
| Category | Power Management (PMIC) |
| Function | Step-Up/Step-Down |
| Topology | Cuk |
| Output Configuration | Negative |
| Output Type | Adjustable |
| Number of Outputs | 1 |
| Voltage - Input (Min) | 2.7V |
| Voltage - Input (Max) | 14V |
| Voltage - Output (Min/Fixed) | -1.23V |
| Voltage - Output (Max) | -32V |
| Current - Output | 1.2A |
| Frequency - Switching | 1.4MHz |
| Operating Temperature | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount |
| Package / Case | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 |
Substitute Part Grouping Explanation
Substitution eligibility for the LM2611AMFX is determined by strict equivalence across the following critical parameters:
- Topology: Cuk Switching Regulator
- Output Configuration: Negative voltage
- Output Type: Adjustable
- Input Voltage Range: 2.7V to 14V
- Output Voltage Range: -1.23V to -32V
- Output Current: 1.2A
- Switching Frequency: 1.4MHz
- Package: SC-74A (SOT-753) / SOT-23-5
- Operating Temperature Range: -40°C to 125°C
The LM2611AMFX/NOPB qualifies as a direct substitute based on complete parameter alignment across all electrical and mechanical specifications. The primary distinction between these parts is product status and regulatory compliance certification.
Parameter Comparison
| Parameter | LM2611AMFX | LM2611AMFX/NOPB |
|---|---|---|
| Manufacturer | Texas Instruments | Texas Instruments |
| Product Status | Obsolete | Active |
| Function | Step-Up/Step-Down | Step-Up/Step-Down |
| Topology | Cuk | Cuk |
| Output Configuration | Negative | Negative |
| Output Type | Adjustable | Adjustable |
| Number of Outputs | 1 | 1 |
| Voltage - Input (Min) | 2.7V | 2.7V |
| Voltage - Input (Max) | 14V | 14V |
| Voltage - Output (Min/Fixed) | -1.23V | -1.23V |
| Voltage - Output (Max) | -32V | -32V |
| Current - Output | 1.2A | 1.2A |
| Frequency - Switching | 1.4MHz | 1.4MHz |
| Operating Temperature | -40°C ~ 125°C (TJ) | -40°C ~ 125°C (TJ) |
| Mounting Type | Surface Mount | Surface Mount |
| Package / Case | SC-74A, SOT-753 | SC-74A, SOT-753 |
| Supplier Device Package | SOT-23-5 | SOT-23-5 |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) | 1 (Unlimited) |
| REACH Status | REACH Unaffected | REACH Unaffected |
Engineering Selection Recommendations
The LM2611AMFX/NOPB is the direct equivalent substitute for the obsolete LM2611AMFX. Both parts share identical electrical specifications, thermal operating range, and physical packaging. The LM2611AMFX/NOPB maintains Active product status with significantly higher inventory availability (41,200 units versus 4,866 units).
The LM2611AMFX/NOPB carries ROHS3 compliance certification, whereas the original LM2611AMFX is RoHS non-compliant. This distinction is relevant for applications subject to RoHS regulatory requirements. Both parts maintain REACH Unaffected status and identical Moisture Sensitivity Level (MSL) ratings.
For new designs or production continuity, the LM2611AMFX/NOPB is the appropriate selection based on active product status and regulatory compliance posture.
Frequently Asked Questions (FAQ)
Q: Are the LM2611AMFX and LM2611AMFX/NOPB electrically identical?
A: Yes. Both parts deliver identical electrical performance across all specified parameters: input voltage range (2.7V to 14V), adjustable negative output voltage (-1.23V to -32V), output current (1.2A), switching frequency (1.4MHz), and operating temperature range (-40°C to 125°C).
Q: What is the significance of the "/NOPB" suffix?
A: The "/NOPB" designation indicates the part is supplied without plumbum (lead-free). This marking correlates with the RoHS3 compliance certification of the LM2611AMFX/NOPB variant.
Q: Can the LM2611AMFX/NOPB be used as a direct replacement in existing designs?
A: Yes. The LM2611AMFX/NOPB is a direct pin-for-pin and functionally equivalent substitute. No circuit modifications or design changes are required. Both parts use identical SC-74A (SOT-753) packaging with SOT-23-5 supplier device package designation.
Q: Why is the original LM2611AMFX marked as Obsolete?
A: Obsolete status indicates the part is no longer in active production. The LM2611AMFX/NOPB represents the current active production equivalent from Texas Instruments.
Q: Are there inventory differences between these parts?
A: Yes. The LM2611AMFX has 4,866 units in stock, while the LM2611AMFX/NOPB has 41,200 units available. The LM2611AMFX/NOPB offers significantly greater supply availability.
Q: Do both parts have the same moisture sensitivity rating?
A: Yes. Both the LM2611AMFX and LM2611AMFX/NOPB carry MSL Level 1 (Unlimited), indicating no moisture sensitivity constraints for storage or handling.
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