LT1085CT-12 Analog Devices Integrated Circuit (Transistor Outline, Vertical) In Stock
Analog Devices LT1085CT-12 is a 3A low dropout positive fixed voltage regulator outputting 12V, with a maximum dropout voltage of 1.5V and input voltage range of 13.5V to 25V. It features line regulation of 0.025% and is housed in a TO-220 package for easy heatsinking, making it ideal for regulated power supply designs. Available in stock worldwide with fast shipping.
- Manufacturer
- Analog Devices
- Package
- Transistor Outline, Vertical
- Pin Count
- 3
- Lifecycle
- OBSOLETE
- Datasheet
- LT1085CT-12 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- 3A output current capability with only 1.5V maximum dropout voltage for efficient low-headroom regulation
- Fixed 12V output with 0.025% maximum line regulation for stable precision power supplies
- Input voltage range of 13.5V to 25V with 30V absolute maximum for robust supply compatibility
- TO-220 package with exposed tab for simple heatsink attachment in high-current applications
Applications
The LT1085CT-12 is ideally suited for post-regulator stages in distributed power systems, embedded computing boards, and industrial control equipment where a stable 3A at 12V output is required with minimal dropout. Its 1.5V low dropout characteristic makes it effective in battery-powered systems and automotive applications where input rail variation is tight, and the TO-220 package allows easy thermal management with standard heatsinks. It is also a reliable solution for powering relay drivers, solenoids, and analog circuitry demanding clean, regulated 12V rails.
Specifications
| YTEOL | 0 |
| Adjustability | FIXED |
| Dropout Voltage1-Max | 1.5V |
| Dropout Voltage1-Nom | 1.5V |
| Input Voltage Absolute-Max | 30V |
| Input Voltage-Max | 25V |
| Input Voltage-Min | 13.5V |
| JESD-30 Code | R-PSFM-T3 |
| JESD-609 Code | e0 |
| Line Regulation-Max | 0.025% |
| Load Regulation-Max | 0.072% |
| Number of Functions | 1 |
| Number of Outputs | 1 |
| Operating Temperature TJ-Max | 125°C |
| Output Current1-Max | 3A |
| Output Voltage1-Max | 12.24V |
| Output Voltage1-Min | 11.76V |
| Output Voltage1-Nom | 12V |
| Package Body Material | PLASTIC/EPOXY |
| Package Shape | RECTANGULAR |
| Package Style | FLANGE MOUNT |
| Qualification Status | Not Qualified |
| Regulator Type | FIXED POSITIVE SINGLE OUTPUT LDO REGULATOR |
| Surface Mount | NO |
| Technology | BIPOLAR |
| Terminal Finish | Tin/Lead (Sn/Pb) - with Nickel (Ni) barrier |
| Terminal Form | THROUGH-HOLE |
| Terminal Position | SINGLE |
| Voltage Tolerance-Max | 2% |
| Package | Transistor Outline, Vertical |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| Moisture Sensitivity Level | MSL 1 |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
No known alternates. Submit an RFQ and our team can suggest alternatives.
Frequently Asked Questions
For a battery-powered system running on a 14.4V pack, can LT1085CT-12 maintain regulation down to low battery voltage?
The LT1085CT-12 requires a minimum input of 13.5V to regulate its fixed 12V output, meaning regulation is maintained when the battery voltage stays above 13.5V. With a maximum dropout of 1.5V, the device will begin to drop out of regulation when input falls below 13.5V, so battery chemistry and discharge profile must be considered in the design.
How much output current can LT1085CT-12 supply and what heatsinking is needed at full load?
The LT1085CT-12 supplies up to 3A of output current. At full load with a 25V input and 12V output, power dissipation reaches 39W, requiring an adequate heatsink attached to the TO-220 package tab. Proper thermal management with a heatsink rated for the expected ambient temperature is essential to stay within safe junction temperature limits.
When is LT1085CT-12 a preferable choice over a switching regulator for a 12V rail?
The LT1085CT-12 is preferable when output noise and ripple must be minimized below levels achievable with switching converters, such as in audio equipment, precision analog signal chains, and RF circuitry. Its 0.025% line regulation and inherently clean LDO output make it excellent for noise-sensitive loads drawing up to 3A from a 13.5V to 25V input supply.
What is the absolute maximum input voltage for LT1085CT-12 and how does it affect supply design margin?
The LT1085CT-12 has an absolute maximum input voltage of 30V, giving a 5V margin above the rated 25V maximum operating input. This margin accommodates transients, start-up spikes, and supply tolerances in industrial and automotive designs, though continuous operation should not exceed 25V to ensure long-term reliability of the device.
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Analog Devices (ADI) is a global leader in high-performance analog, mixed-signal, and digital signal processing integrated circuits used in virtually all types of electronic equipment.
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