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Texas Instruments UA78M05CKTPR
- Part No.:
- UA78M05CKTPR
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
UA78M05CKTPR.pdf
- Description:
- IC REG LIN 5V 500MA 2POWERFLEX
- Quantity:
- Payment:
- Shipping:
Inventory:2,899
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Product details
Overview
UA78M05CKTPR from Texas Instruments is a 5 V, 500 mA fixed-output linear voltage regulator in TO-252 (PowerFLEX) package with three terminals (Input, Output, Common), internal thermal overload and short-circuit protection, and 2 V dropout voltage - used for on-card regulation in portable devices and computing power supplies.
For engineers reviewing the UA78M05CKTPR datasheet, UA78M05CKTPR pinout, UA78M05CKTPR application, or UA78M05CKTPR equivalent, key selection criteria include output voltage tolerance (±4%), input voltage range (7–25 V), ripple rejection (62 dB at 120 Hz), thermal shutdown behavior, and compatibility with 0.33 µF input / 0.1 µF output ceramic decoupling capacitors.
Technical Context
The UA78M05CKTPR implements a monolithic series-pass transistor regulator architecture with built-in safe-area compensation and current-limiting circuitry. It operates without external components for basic regulation but requires specified input/output capacitance (0.33 µF / 0.1 µF) to meet datasheet performance across temperature and load.
It delivers stable 5 V output over input voltages from 7 V to 25 V and load currents up to 500 mA, with thermal shutdown activating at ~150 °C virtual junction temperature and short-circuit current limited to 300 mA under 35 V input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 5 V ±4% (4.75–5.25 V) across 5 mA–500 mA load and –40°C to 125°C ambient - ensures logic-level compatibility with 5 V microcontrollers and peripherals. |
| Max Output Current | 500 mA continuous - supports moderate-power analog circuits, sensors, and digital ICs without external pass transistors. |
| Dropout Voltage | 2 V at 200 mA - requires minimum 7 V input for regulated 5 V output, limiting use in low-input-voltage battery systems. |
| Ripple Rejection | 62 dB at 120 Hz - suppresses line-frequency noise from unregulated AC/DC supplies, critical for clean analog signal chains. |
| Thermal Shutdown | Activates at ~150 °C virtual junction temperature - prevents permanent damage during sustained overload or poor heatsinking. |
| Input Voltage Range | 7 V to 25 V - accommodates standard 9–24 V industrial and telecom supply rails while avoiding excessive power dissipation. |
| Bias Current | 4.5–6 mA - contributes directly to quiescent power loss; must be included in total system standby current budget. |
Pinout & Package
UA78M05CKTPR uses the KTP (TO-252-2) PowerFLEX package: 6.60 mm × 6.10 mm body, 3-pin configuration with exposed thermal pad (pin 2 = Common/Ground). Pin 1 is Input, Pin 2 is Common, Pin 3 is Output - per JEDEC TO-252 variation AC mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (INPUT) | Unregulated DC supply input | Accepts 7–25 V; requires 0.33 µF ceramic capacitor placed adjacent to minimize high-frequency noise coupling. |
| Pin 2 (COMMON) | Ground reference and thermal path | Serves as circuit ground return and primary thermal conduction path to PCB copper; must be connected to large copper pour. |
| Pin 3 (OUTPUT) | Regulated 5 V output | Delivers up to 500 mA; requires 0.1 µF ceramic capacitor at pin for stability and transient response per datasheet. |
Key Features
| Feature | Design Value |
|---|---|
| 3-terminal fixed-output topology | Eliminates need for external feedback resistors or compensation networks - reduces BOM count and layout complexity. |
| Internal short-circuit current limiting | Clamps output current to ≤300 mA during fault, enabling safe operation without external fusing in many applications. |
| Output transistor safe-area compensation | Prevents secondary breakdown during transient overloads - improves reliability under pulse-load conditions like motor startup. |
| Thermal-overload protection | Shuts down regulator when junction exceeds ~150 °C and auto-recovers upon cooling - avoids catastrophic failure without system-level intervention. |
| No external components required | Operates with only input/output decoupling caps - simplifies design validation and accelerates time-to-test for prototyping. |
Applications
| Portable Medical Sensors | Industrial PLC I/O Modules |
|---|---|
Use Scenario: Powering low-noise analog front-ends in handheld ECG or pulse oximeter units with single-cell Li-ion or 9 V battery input. IC Role / Device Role / Timing Role: Primary 5 V linear regulator supplying ADC reference, op-amps, and microcontroller core voltage. Use Value: 62 dB ripple rejection suppresses switching noise from boost converters, ensuring <100 µV RMS output noise for sub-12-bit measurement accuracy. | Use Scenario: Local regulation for isolated digital I/O channels in DIN-rail mounted programmable logic controllers. IC Role / Device Role / Timing Role: On-board 5 V rail generator for optocoupler drivers and level-shifting logic, fed from 24 V DC field bus. Use Value: Internal thermal shutdown prevents latch-up during sustained 500 mA loads in confined enclosures, eliminating need for external thermal monitoring. |
| Embedded Computing Peripherals | Telecom Line Card Power |
Use Scenario: Providing clean 5 V to USB host controllers, SD card interfaces, and Ethernet PHYs in edge gateway devices. IC Role / Device Role / Timing Role: Secondary local regulator downstream of a buck converter, isolating noise-sensitive interfaces from main power rail. Use Value: 2 V dropout enables stable operation with 7 V input from intermediate 9 V rail, reducing heat generation vs. higher-dropout alternatives. | Use Scenario: Point-of-load regulation for FPGA configuration memory and management MCU on telecom line cards with 12 V backplane supply. IC Role / Device Role / Timing Role: Fixed 5 V supply for non-critical logic and status LEDs where cost and footprint are prioritized over efficiency. Use Value: TO-252 package allows direct mounting to heatsinked PCB areas, achieving 30.3 °C/W junction-to-ambient thermal resistance without added hardware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| LM78M05CDT-TR | Same 5 V/500 mA spec, SOIC-8 package with different pinout (Input/Output/Common/GND); 65 °C/W RθJA vs. UA78M05CKTPR's 28 °C/W. | Requires PCB redesign due to 8-pin SOIC footprint and thermal pad absence; less suitable for high-ambient industrial environments. | Select LM78M05CDT-TR only if space-constrained layouts favor surface-mount SOIC and thermal load is <2 W. |
| MC78M05BDTG | 5 V/500 mA, TO-252-3 package (pin 1=Input, pin 2=Ground, pin 3=Output), 2.5 V dropout, –40°C to 125°C operating range. | Higher dropout limits usable input range; identical thermal performance but tighter output tolerance (±2% vs. ±4%). | Choose MC78M05BDTG when tighter initial accuracy is required and input headroom ≥9.5 V is available. |
Compared with LM78M05CDT-TR and MC78M05BDTG, UA78M05CKTPR offers superior thermal performance in TO-252-2 format and lower dropout, making it optimal for compact industrial designs where board-level heatsinking is feasible and input voltage margin is constrained.
Availability
UA78M05CKTPR is available at Aetrix Electronics and suitable for portable medical sensors, industrial PLC I/O modules, and embedded computing peripherals requiring stable component supply with known thermal behavior and legacy-compatible 5 V regulation.
Supply support for UA78M05CKTPR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Texas Instruments is a global semiconductor company specializing in analog and embedded processing technologies, with leadership in power management ICs since the 1970s.
The UA78Mxx series was designed for cost-sensitive, noise-sensitive on-card regulation in computing, telecommunications, and portable equipment - emphasizing simplicity, reliability, and wide operating temperature support.
FAQ
What is the maximum input voltage rating for UA78M05CKTPR?
The absolute maximum input voltage for UA78M05CKTPR is 35 V, but the recommended operating range is 7 V to 25 V. Exceeding 25 V increases power dissipation and thermal stress beyond design intent, risking premature thermal shutdown or reduced long-term reliability. Always verify input transient margins against this limit in your application.
Does UA78M05CKTPR require external capacitors to function properly?
Yes, UA78M05CKTPR requires a 0.33 µF ceramic capacitor on the input and a 0.1 µF ceramic capacitor on the output to meet datasheet specifications for stability, ripple rejection, and transient response. Omitting either capacitor may cause oscillation, poor regulation, or failure to reject input noise - especially at 120 Hz line frequency.
Is UA78M05CKTPR pin-compatible with other TO-252 5 V regulators like MC78M05BDTG?
No, UA78M05CKTPR is not pin-compatible with MC78M05BDTG. UA78M05CKTPR uses a 3-pin TO-252-2 configuration (Input–Common–Output), while MC78M05BDTG uses TO-252-3 (Input–Ground–Output) with pin 2 as Ground and pin 3 as Output. Swapping them without PCB revision will result in incorrect connections and potential damage.
What is the output voltage tolerance of UA78M05CKTPR over temperature and load?
UA78M05CKTPR guarantees 4.75 V to 5.25 V (±50 mV, or ±4%) over load current from 5 mA to 500 mA and temperature from –40°C to 125°C for the 'I' grade, and 0°C to 125°C for the 'C' grade. This tolerance includes line regulation, load regulation, and temperature coefficient effects as measured per SLVS059T.
Can UA78M05CKTPR be used in automotive applications?
UA78M05CKTPR is not qualified for automotive use (AEC-Q100). Its specified operating temperature range is –40°C to 125°C for the 'I' variant and 0°C to 125°C for the 'C' variant, but it lacks automotive-specific qualification testing, extended life testing, or PPAP documentation. For automotive applications, consider TI's TL750L05 or TL751L05, which are AEC-Q100 Grade 3 qualified.
UA78M05CKTPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 25V
- Voltage - Output (Min/Fixed):
- 5V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 2V @ 350mA
- Current - Output:
- 500mA
- Current - Quiescent (Iq):
- -
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- 0°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252-3
UA78M05CKTPR FAQ
1.How can I place an order for UA78M05CKTPR through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78M05CKTPR on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for UA78M05CKTPR reliable?
The price and inventory of UA78M05CKTPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78M05CKTPR is usually 5 days.
3.What payment methods are accepted for UA78M05CKTPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA78M05CKTPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA78M05CKTPR?
UA78M05CKTPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA78M05CKTPR order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for UA78M05CKTPR?
For technical support, including UA78M05CKTPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78M05CKTPR requirements.
6.How does Aetrix verify that UA78M05CKTPR is sourced from the original manufacturer or authorized distributors?
All UA78M05CKTPR products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that UA78M05CKTPR meets industry standards.
7.What is the process for return or replacement of UA78M05CKTPR?
All UA78M05CKTPR units undergo pre-shipment inspection (PSI). If there is an issue with UA78M05CKTPR, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The UA78M05CKTPR part is unused and in its original packaging.
Return procedure for UA78M05CKTPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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