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MAX666ESA Linear Voltage Regulator Equivalent & Substitute Parts
Part Overview
The MAX666ESA is a linear voltage regulator IC from Analog Devices Inc./Maxim Integrated, classified as a Power Management (PMIC) component. This device functions as a positive adjustable (fixed) output regulator with a single output capable of delivering 40mA. The MAX666ESA is currently listed as obsolete, which necessitates identification of functionally equivalent substitute parts for ongoing design support and component procurement.
Substiute Parts
Key Parameters
| Parameter | Value |
|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated |
| Category | Power Management (PMIC) |
| Output Configuration | Positive |
| Output Type | Adjustable (Fixed) |
| Number of Regulators | 1 |
| Voltage - Input (Max) | 16.5V |
| Voltage - Output (Min/Fixed) | 1.3V (5V) |
| Voltage - Output (Max) | 16V |
| Voltage Dropout (Max) | 0.9V @ 40mA |
| Current - Output | 40mA |
| Current - Quiescent (Iq) | 15 µA |
| Control Features | Current Limit, Enable, Low Battery Detection |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Base Product Number | MAX666 |
Substitute Part Grouping Explanation
Substitution of the MAX666ESA is determined by strict equivalence across the following critical parameters:
- Output configuration (positive)
- Output type (adjustable/fixed)
- Number of regulators (single output)
- Input voltage range (maximum 16.5V)
- Output voltage range (1.3V to 16V)
- Dropout voltage specification (0.9V @ 40mA)
- Output current capability (40mA)
- Quiescent current (15 µA)
- Control features (current limit, enable, low battery detection)
- Operating temperature range (-40°C ~ 85°C)
- Package type (8-SOIC)
The MAX666ESA+ meets all these criteria and is identified as a direct substitute. The primary distinction between these parts is product status and compliance certification.
Parameter Comparison
| Parameter | MAX666ESA | MAX666ESA+ |
|---|---|---|
| Manufacturer | Analog Devices Inc./Maxim Integrated | Analog Devices Inc./Maxim Integrated |
| Output Configuration | Positive | Positive |
| Output Type | Adjustable (Fixed) | Adjustable (Fixed) |
| Voltage - Input (Max) | 16.5V | 16.5V |
| Voltage - Output (Min/Fixed) | 1.3V (5V) | 1.3V (5V) |
| Voltage - Output (Max) | 16V | 16V |
| Voltage Dropout (Max) | 0.9V @ 40mA | 0.9V @ 40mA |
| Current - Output | 40mA | 40mA |
| Current - Quiescent (Iq) | 15 µA | 15 µA |
| Control Features | Current Limit, Enable, Low Battery Detection | Current Limit, Enable, Low Battery Detection |
| Operating Temperature | -40°C ~ 85°C | -40°C ~ 85°C |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) | 8-SOIC (0.154", 3.90mm Width) |
| Product Status | Obsolete | Active |
| RoHS Status | RoHS non-compliant | ROHS3 Compliant |
| Packaging | Not specified | Tube |
Engineering Selection Recommendations
The MAX666ESA+ is the direct functional equivalent of the MAX666ESA. Both parts share identical electrical specifications and package configuration. The MAX666ESA+ is preferred for new designs and ongoing procurement due to its active product status and ROHS3 compliance certification. The MAX666ESA is obsolete and should be replaced with the MAX666ESA+ in applications where component availability and regulatory compliance are required.
Frequently Asked Questions (FAQ)
Q: Can MAX666ESA+ be used as a direct replacement for MAX666ESA? A: Yes. Both parts are electrically and mechanically identical across all specified parameters. The MAX666ESA+ is the active production equivalent.
Q: What is the difference between MAX666ESA and MAX666ESA+? A: The primary differences are product status (obsolete versus active) and RoHS compliance (non-compliant versus ROHS3 compliant). Electrical performance and package specifications are identical.
Q: Are there any package or pinout differences? A: No. Both parts use the 8-SOIC package with identical dimensions (0.154", 3.90mm width) and pinout configuration.
Q: Why is the MAX666ESA listed as obsolete? A: The MAX666ESA has been superseded by the MAX666ESA+, which maintains full electrical compatibility while meeting current regulatory compliance standards.
Q: Can I use MAX666ESA+ in legacy designs originally specified for MAX666ESA? A: Yes. The MAX666ESA+ is a direct substitute with no design modifications required. Pin-for-pin and functional compatibility is maintained.
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