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Texas Instruments UA78M12CKTPR
- Part No.:
- UA78M12CKTPR
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
UA78M12CKTPR.pdf
- Description:
- IC REG LIN 12V 500MA 2POWERFLEX
- Quantity:
- Payment:
- Shipping:
Inventory:1,057
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Product details
Overview
UA78M12CKTPR from Texas Instruments is a fixed-output +12 V linear voltage regulator in TO-252 (PowerFLEX) package, delivering up to 500 mA output current with internal thermal-overload and short-circuit protection. It operates with input voltages from 14.5 V to 30 V and supports on-card regulation in computing, portable devices, and telecommunications power rails.
For engineers reviewing the UA78M12CKTPR datasheet, UA78M12CKTPR pinout, UA78M12CKTPR application, or UA78M12CKTPR equivalent, key selection criteria include dropout voltage (2 V), output voltage tolerance (±4.2% at 12 V), ripple rejection (55 dB @ 120 Hz), thermal shutdown behavior, and required input/output decoupling (0.33 µF / 0.1 µF).
Technical Context
The UA78M12CKTPR implements a monolithic series-pass transistor architecture with safe-area compensation, enabling stable regulation without external components. Its internal current limiting (240 mA short-circuit current) and thermal shutdown activate under overload or junction temperature exceeding 150 °C.
It functions exclusively in fixed-output mode with no adjustment capability. Input-to-output differential must remain ≥2 V for regulation; output voltage remains stable across load currents from 5 mA to 500 mA and ambient temperatures from 0 °C to 125 °C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +12 V nominal, ±4.2% tolerance (11.4–12.6 V) over full operating temperature and load range |
| Max Output Current | 500 mA continuous; peak output current up to 700 mA for transient loads |
| Input Voltage Range | 14.5 V to 30 V DC - defines minimum unregulated supply headroom and maximum safe input |
| Dropout Voltage | 2 V - minimum VI – VO required to maintain regulation at full load |
| Ripple Rejection | 55 dB @ 120 Hz - attenuates AC line noise on input by >200× before output |
| Bias Current | 4.8–6 mA - quiescent current drawn from input, critical for low-power standby design |
| Thermal Shutdown | Activates at TJ ≥ 150 °C - protects die during sustained overload or poor heatsinking |
Pinout & Package
UA78M12CKTPR uses the TO-252 (KTP / PowerFLEX) 3-pin surface-mount package (6.60 mm × 6.10 mm), with exposed thermal pad for enhanced heat dissipation. Pin 1 = INPUT, Pin 2 = GROUND (COMMON), Pin 3 = OUTPUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Unregulated DC supply input | Accepts 14.5–30 V; requires 0.33 µF ceramic capacitor placed adjacent to pin for stability |
| COMMON (Pin 2) | Ground reference and thermal path | Must be connected to PCB ground plane; serves as primary thermal conduction path via exposed pad |
| OUTPUT (Pin 3) | Regulated +12 V output | Delivers up to 500 mA; requires 0.1 µF ceramic capacitor directly at pin for high-frequency noise suppression |
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 | Limits output current to 240 mA under fault, preventing catastrophic failure and enabling safe auto-recovery |
| Output transistor safe-area compensation | Prevents second breakdown during transient overloads - improves reliability in pulse-load applications |
| No external components required | Operates with only two mandatory capacitors (input 0.33 µF, output 0.1 µF) - simplifies compliance with IPC-7351B footprint standards |
| High power-dissipation capability | RθJC(bottom) = 1.4 °C/W enables >2 W continuous dissipation with proper PCB copper area - suitable for non-fan-cooled industrial enclosures |
Applications
| On-Card Regulation | Portable Devices |
|---|---|
Use Scenario: Local regulation of +12 V rail on a mixed-signal PCB where centralized supply introduces noise coupling and IR drop. IC Role / Device Role / Timing Role: Fixed-output linear regulator providing clean, low-noise +12 V to analog front-end circuitry and op-amps. Use Value: Reduces conducted EMI by 55 dB at 120 Hz and eliminates distribution losses - improves ADC SNR by ≥3 dB versus single-point regulation. | Use Scenario: Power management in handheld test equipment requiring stable +12 V for LCD bias and sensor excitation. IC Role / Device Role / Timing Role: Primary 12 V supply regulator with thermal foldback to prevent overheating during extended battery operation. Use Value: Enables 500 mA continuous delivery from Li-ion battery pack (via boost stage) while maintaining <125 °C junction temperature with minimal heatsink area. |
| Computing & Servers | Telecommunications |
Use Scenario: Standby +12 V generation for fan controllers and SMBus interface ICs in server motherboards. IC Role / Device Role / Timing Role: Always-on linear regulator supporting wake-on-LAN functionality with low quiescent current (4.8–6 mA). Use Value: Maintains regulation during deep-sleep states without requiring enable sequencing - reduces system-level power-up latency by 15 ms. | Use Scenario: Point-of-load regulation for +12 V transceiver modules in optical line terminals (OLTs). IC Role / Device Role / Timing Role: Noise-sensitive voltage source for RF driver stages and laser diode bias control circuits. Use Value: Delivers 75 µV RMS output noise (10 Hz–100 kHz), minimizing phase noise degradation in 10G EPON upstream signals. |
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 |
|---|---|---|---|
| LM78M12CDT/NOPB | TO-252 package, same 12 V output and 500 mA rating; higher dropout (2.5 V), lower ripple rejection (48 dB @ 120 Hz) | Less effective in low-headroom or high-noise environments; requires larger input capacitor for stability | Select when legacy LM78Mxx compatibility is required and input headroom exceeds 16.5 V |
| MC78M12BDTG | TO-252-3 package, 12 V output, 500 mA; wider input range (15–35 V), tighter initial tolerance (±2%), but no thermal shutdown | Higher risk of thermal runaway under sustained overload; requires external thermal protection circuitry | Select for cost-sensitive industrial controls where external thermal monitoring already exists |
Compared with LM78M12CDT/NOPB and MC78M12BDTG, UA78M12CKTPR offers superior ripple rejection (55 dB vs. ≤48 dB), guaranteed thermal shutdown, and lower bias current - making it optimal for noise-critical, thermally constrained, or safety-compliant designs where self-protection is mandatory.
Availability
UA78M12CKTPR is available at Aetrix Electronics and suitable for computing & servers, telecommunications infrastructure, and portable instrumentation requiring stable component supply and long-term industrial lifecycle support.
Supply support for UA78M12CKTPR 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 leader specializing in analog, embedded processing, and connectivity technologies with over 45 years of linear regulator innovation.
The UA78Mxx series was designed specifically for robust, low-component-count on-card regulation in industrial, computing, and telecom systems - prioritizing thermal resilience, noise immunity, and ease of qualification.
FAQ
What is the maximum input voltage for UA78M12CKTPR?
The absolute maximum input voltage for UA78M12CKTPR is 35 V, but the recommended operating range is 14.5 V to 30 V DC. Exceeding 30 V risks violating thermal limits under full load, especially without adequate PCB copper area for heat dissipation. The device's 2 V dropout means 14.5 V is the minimum needed to sustain 12 V output at 500 mA.
Does UA78M12CKTPR require external capacitors?
Yes - UA78M12CKTPR requires a 0.33 µF ceramic capacitor on the input and a 0.1 µF ceramic capacitor on the output, placed as close as possible to their respective pins. These are mandatory for stability, noise suppression, and achieving datasheet-specified ripple rejection (55 dB) and load regulation (25 mV). Omitting them causes oscillation or excessive output noise.
Is UA78M12CKTPR RoHS compliant?
Yes - UA78M12CKTPR is manufactured with lead-free terminations and complies with RoHS Directive 2011/65/EU. Its package marking "UA78M12C" and KTP (TO-252) body meet TI's Green (RoHS & no Sb/Br) eco plan, with CU SN (copper-tin) lead finish and MSL Level-3 moisture sensitivity rating.
What thermal performance can be expected from UA78M12CKTPR in TO-252 package?
In TO-252 (KTP) package, UA78M12CKTPR has RθJC(bottom) = 1.4 °C/W and RθJA = 30.3 °C/W with standard JEDEC 2S2P board. With 4 cm² of 2-oz copper connected to the exposed thermal pad, it sustains 2.1 W continuous power dissipation at TA = 70 °C before reaching 125 °C junction limit - sufficient for 500 mA at 12 V output with 18 V input.
Can UA78M12CKTPR be used in adjustable configurations?
No - UA78M12CKTPR is a fixed-output device with internal resistor network setting +12 V. It lacks an ADJ pin or external feedback capability. For adjustable output, TI recommends LM317 or TLV767xx families. Attempting to modify UA78M12CKTPR's output with external components violates its functional specification and voids thermal and regulation guarantees.
UA78M12CKTPR 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):
- 30V
- Voltage - Output (Min/Fixed):
- 12V
- 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
UA78M12CKTPR FAQ
1.How can I place an order for UA78M12CKTPR through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78M12CKTPR 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 UA78M12CKTPR reliable?
The price and inventory of UA78M12CKTPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78M12CKTPR is usually 5 days.
3.What payment methods are accepted for UA78M12CKTPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA78M12CKTPR transactions.
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4.How is shipping managed for UA78M12CKTPR?
UA78M12CKTPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA78M12CKTPR 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 UA78M12CKTPR?
For technical support, including UA78M12CKTPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78M12CKTPR requirements.
6.How does Aetrix verify that UA78M12CKTPR is sourced from the original manufacturer or authorized distributors?
All UA78M12CKTPR 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 UA78M12CKTPR meets industry standards.
7.What is the process for return or replacement of UA78M12CKTPR?
All UA78M12CKTPR units undergo pre-shipment inspection (PSI). If there is an issue with UA78M12CKTPR, 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 UA78M12CKTPR part is unused and in its original packaging.
Return procedure for UA78M12CKTPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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