The Texas Instruments LM1085ISX-3.3/NOPB is a 3 A low-dropout positive linear regulator providing a fixed 3.3 V output in a surface-mount TO-263 (D2PAK) package. Dropout is just 1.5 V maximum at full load, with 0.015% line and 0.1% load regulation from a zener-trimmed bandgap reference. Current limiting and on-chip thermal shutdown protect the device, while its LM317-compatible pinout simplifies upgrades in existing 3.3 V power-rail designs.
Key Specifications
| Manufacturer | Texas Instruments |
| Exact Manufacturer Part Number | LM1085ISX-3.3/NOPB |
| Product Category | Power Management – Voltage Regulators |
| Series / Family | LM1085 |
| Package / Case | TO-263 (D2PAK) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C to +125°C |
| Power Supply | 3.3 V fixed output (input up to 29 V) |
| Output Current | 3 A |
| Output Voltage | 3.3 V (fixed) |
| Dropout Voltage | 1.5 V max at 3 A |
| Line Regulation | 0.015% |
| Load Regulation | 0.1% |
| Reference | Zener-trimmed bandgap |
| Protection | Current limiting, thermal shutdown |
| Lifecycle Status | Active |
| Official Documentation | View official documentation |
Key Features
- 3 A low-dropout positive linear regulator with fixed 3.3 V output
- Dropout voltage of 1.5 V maximum at full 3 A load
- Current limiting and on-chip thermal shutdown protection
- Zener-trimmed bandgap reference delivers 0.015% line regulation
- Pin-compatible with the industry-standard LM317
- Surface-mount TO-263 (D2PAK) package for space-constrained boards
Applications
- Post-regulation of switching power supplies
- 3.3 V digital and logic supply rails
- Automotive and industrial power systems
- On-card local regulation
- Constant-current sources
Sourcing
Availability, lead time, date code and commercial terms are subject to confirmation at the time of quotation.
Quality
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FAQ
How does LM1085ISX-3.3/NOPB differ from LM1085IT-ADJ/NOPB?
The ISX-3.3 provides a fixed 3.3 V output in a surface-mount TO-263 package, whereas the IT-ADJ is adjustable via external resistors in a through-hole TO-220 package.
What minimum input voltage is required for a regulated 3.3 V output?
The input must exceed the output by at least the dropout voltage, so approximately 4.8 V or more is needed at the 3 A maximum load.
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