The Texas Instruments LM1085IT-ADJ/NOPB is a 3 A adjustable low-dropout positive regulator in a three-lead TO-220 through-hole package. Its output is set from 1.25 V to 15 V with a pair of external resistors around a 1.25 V bandgap reference, and dropout is just 1.5 V maximum at 3 A. Internal current limiting and thermal shutdown protect the device, while the industry-standard LM317 pinout allows direct replacement in adjustable-rail supplies.
Key Specifications
| Manufacturer | Texas Instruments |
| Exact Manufacturer Part Number | LM1085IT-ADJ/NOPB |
| Product Category | Power Management – Voltage Regulators |
| Series / Family | LM1085 |
| Package / Case | TO-220 |
| Mounting Type | Through Hole |
| Operating Temperature | -40°C to +125°C |
| Power Supply | 1.25 V to 15 V adjustable output (input up to 29 V) |
| Output Current | 3 A |
| Output Voltage | 1.25 V to 15 V (adjustable) |
| Dropout Voltage | 1.5 V max at 3 A |
| Reference Voltage | 1.25 V |
| Line Regulation | 0.015% |
| Load Regulation | 0.1% |
| Protection | Current limiting, thermal shutdown |
| Lifecycle Status | Active |
| Official Documentation | View official documentation |
Key Features
- 3 A adjustable low-dropout positive linear regulator
- Output set from 1.25 V to 15 V with two external resistors
- Dropout voltage of 1.5 V maximum at full 3 A load
- 1.25 V bandgap reference with 0.015% line regulation
- Current limiting and on-chip thermal shutdown
- Industry-standard LM317 pinout in a TO-220 through-hole package
Applications
- Adjustable bench and system power supplies
- Post-regulation of switching converters
- Constant-current LED drivers
- Industrial control rails
- Prototype and development boards
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 LM1085IT-ADJ/NOPB differ from LM1085ISX-3.3/NOPB?
The IT-ADJ offers an adjustable 1.25 V to 15 V output in a through-hole TO-220 package, while the ISX-3.3 is a fixed 3.3 V surface-mount TO-263 part.
How is the output voltage programmed?
A two-resistor divider between the output, the ADJ pin, and ground sets the output around the internal 1.25 V reference using the standard LM317 configuration.
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