Home Power management Linear & low-dropout (LDO) regulators
Home
Power management
Linear & low-dropout (LDO) regulators

UA78M

ACTIVE

500mA 35V linear voltage regulator

Order now
Data sheet

UA78M

ACTIVE
Data sheet Order now

Product details

Rating Catalog Vin (max) (V) 30 Vin (min) (V) 5.3 Iout (max) (A) 0.5 Output options Adjustable Output, Fixed Output Vout (max) (V) 12 Vout (min) (V) 3.3 Fixed output options (V) 3.3, 5, 6, 8, 9, 10, 12 Noise (µVrms) 40 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 4.5 Thermal resistance θJA (°C/W) 23 Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
Rating Catalog Vin (max) (V) 30 Vin (min) (V) 5.3 Iout (max) (A) 0.5 Output options Adjustable Output, Fixed Output Vout (max) (V) 12 Vout (min) (V) 3.3 Fixed output options (V) 3.3, 5, 6, 8, 9, 10, 12 Noise (µVrms) 40 PSRR at 100 KHz (dB) 40 Iq (typ) (mA) 4.5 Thermal resistance θJA (°C/W) 23 Load capacitance (min) (µF) 0.1 Regulated outputs (#) 1 Accuracy (%) 3 Dropout voltage (Vdo) (typ) (mV) 2000 Operating temperature range (°C) -40 to 125
SOT-223 (DCY) 4 45.5 mm² (6.5 mm × 7 mm) TO-220 (KCS) 3 46.228 mm² (10.16 mm × 4.55 mm) TO-252 (KVU) 3 66.726 mm² (6.6 mm × 10.11 mm)
  • Input voltage range (VIN): 5.3V to 30V
  • Absolute maximum input voltage:
    • Legacy chip: 35V
    • New chip: 45V
  • Fixed output voltage range (VOUT): 3.3V to 12V
  • Output current (IOUT): Up to 500mA
  • Quiescent current IQ: 4.5mA
  • Built-in, short-circuit current limiting and thermal protection
  • Stable without any external components
  • Operating junction temperature range:
    • Legacy chip C versions: 0°C to +125°C
    • Legacy chip I version: –40°C to +125°C
    • New chip: –40°C to +125°C
  • Input voltage range (VIN): 5.3V to 30V
  • Absolute maximum input voltage:
    • Legacy chip: 35V
    • New chip: 45V
  • Fixed output voltage range (VOUT): 3.3V to 12V
  • Output current (IOUT): Up to 500mA
  • Quiescent current IQ: 4.5mA
  • Built-in, short-circuit current limiting and thermal protection
  • Stable without any external components
  • Operating junction temperature range:
    • Legacy chip C versions: 0°C to +125°C
    • Legacy chip I version: –40°C to +125°C
    • New chip: –40°C to +125°C

The UA78M fixed-voltage integrated-circuit voltage regulator is designed for a wide range of applications. Use the UA78M for on-card regulation to attenuate post regulation noise and distribution problems associated with single-point regulation. The UA78M delivers up to 500mA of output current. Additionally, the UA78M does not need external components for stable operation across the load current range. The internal current-limiting and thermal-shutdown features of this regulator help protect the device from overload.

The UA78M is characterized for the junction temperature range of –40°C to +125°C. Device performance for new and legacy chips is denoted throughout the document. See the Device Nomenclature table for more details.

The UA78M fixed-voltage integrated-circuit voltage regulator is designed for a wide range of applications. Use the UA78M for on-card regulation to attenuate post regulation noise and distribution problems associated with single-point regulation. The UA78M delivers up to 500mA of output current. Additionally, the UA78M does not need external components for stable operation across the load current range. The internal current-limiting and thermal-shutdown features of this regulator help protect the device from overload.

The UA78M is characterized for the junction temperature range of –40°C to +125°C. Device performance for new and legacy chips is denoted throughout the document. See the Device Nomenclature table for more details.
filter Find other Linear & low-dropout (LDO) regulators
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Pin-for-pin with same functionality to the compared device.
LM2937 ACTIVE 500-mA, 26-V, high-PSRR, low-dropout voltage regulator Better PSRR
Same functionality with different pin-out to the compared device.
LM317M ACTIVE 500-mA, 40-V, adjustable linear voltage regulator Alternative product with wider input voltage
TPS7B86-Q1 ACTIVE Automotive 500-mA, 40-V, ultra-low-IQ, low-dropout (LDO) linear regulator with power good Automotive version

Technical documentation

No results found. Please clear your search and try again.
View all 7
Top documentation Type Title Format options Date
* Data sheet UA78M 500mA, Positive-Voltage Linear Regulator datasheet (Rev. V) PDF | HTML Feb 20, 2025
Application note An empirical analysis of the impact of board layout on LDO thermal performance (Rev. A) PDF | HTML Sep 23, 2025
Application note LDO Noise Demystified (Rev. B) PDF | HTML Aug 18, 2020
Application note A Topical Index of TI LDO Application Notes (Rev. F) Jun 27, 2019
E-book LDO Basics (Rev. A) Apr 8, 2019
Application note LDO PSRR Measurement Simplified (Rev. A) PDF | HTML Aug 9, 2017
Technical article LDO basics: dropout PDF | HTML Mar 16, 2017

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

MLTLDO2EVM-037 — Universal LDO linear voltage regulator evaluation module for DCY, DDA and KVU packages

The MLTLDO2EVM-037 multipackage low-dropout (LDO) evaluation module (EVM) allows design engineers to evaluate the operation and performance of several common packages of linear regulators for possible use in their own circuit application. This EVM configuration contains a DDA, 3-pin and 5-pin KVU, (...)

User guide: PDF
Supported products & hardware
In stock
Limit:
??asset.out-of-stock-ti_en_US??
Not available
Simulation model

UA78M Fixed 5V PSpice Transient Model

SLVME53.ZIP (26 KB) - PSpice model
Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
SOT-223 (DCY) 4 Ultra Librarian
TO-220 (KCS) 3 Ultra Librarian
TO-252 (KVU) 3 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos