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Texas Instruments UA78M09CKTPR
- Part No.:
- UA78M09CKTPR
- Manufacturer:
- Texas Instruments
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
UA78M09CKTPR.pdf
- Description:
- IC VOLT REG POS 9V .5A TO-252
- Quantity:
- Payment:
- Shipping:
Inventory:2,320
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Product details
Overview
UA78M09CKTPR from Texas Instruments is a fixed-output +9 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 voltage range 11.5 V to 26 V and supports on-card regulation in portable devices and computing power rails.
For engineers reviewing the UA78M09CKTPR datasheet, UA78M09CKTPR pinout, UA78M09CKTPR application, or UA78M09CKTPR equivalent, key selection criteria include dropout voltage (2 V), output voltage tolerance (±5%), ripple rejection (56 dB at 120 Hz), and thermal performance in TO-252 packages for industrial-grade operation (0°C to 125°C).
Technical Context
This device implements a monolithic three-terminal linear regulator architecture with integrated pass transistor, current-limiting circuitry, and thermal shutdown. Its fixed +9 V output is trimmed during manufacturing and does not require external feedback components.
The regulator maintains stable output under load variations from 5 mA to 500 mA and input transients within 11.5 V–26 V, with built-in safe-area compensation for the output transistor and bias current of 4.6–6 mA across operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | +9.0 V ±5% (8.55 V to 9.45 V) over 5 mA–500 mA load and 0°C–125°C junction temperature |
| Input Voltage Range | 11.5 V to 26 V - defines minimum headroom (2 V dropout) and maximum safe input for continuous operation |
| Output Current | Up to 500 mA - usable for mid-power analog/digital subsystems without external heat sinking under typical PCB layout |
| Ripple Rejection | 56 dB at 120 Hz - suppresses line-frequency noise from unregulated DC supplies or rectified AC sources |
| Dropout Voltage | 2 V at 350 mA - determines minimum input–output differential required to sustain regulation |
| Thermal Shutdown | Activates at ~150°C junction temperature - protects device during overload or poor heatsinking conditions |
| Bias Current | 4.6–6 mA - contributes to total system quiescent power and affects light-load efficiency |
Pinout & Package
UA78M09CKTPR uses the TO-252 (KTP / PowerFLEX) 3-pin surface-mount package with exposed thermal pad (JEDEC TO-252-AC variant). The package measures 6.60 mm × 6.10 mm and provides low thermal resistance (RθJC(bottom) = 1.4°C/W) for efficient PCB heat transfer.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| INPUT (Pin 1) | Unregulated DC supply input | Accepts 11.5–26 V; requires 0.33 µF ceramic decoupling capacitor placed adjacent to pin |
| COMMON (Pin 2) | Ground reference and thermal path | Connected to PCB ground plane; serves as primary thermal conduction path via exposed pad |
| OUTPUT (Pin 3) | Regulated +9 V output | Delivers up to 500 mA; requires 0.1 µF ceramic capacitor at pin for stability and noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| Fixed +9 V Output | No external resistors or feedback network needed - simplifies BOM and layout for dedicated 9 V rail generation |
| Internal Short-Circuit Protection | Limits peak output current to 250 mA during fault - prevents catastrophic failure and enables safe auto-recovery |
| Thermal Overload Protection | Shuts down at ~150°C junction temperature and resumes operation after cooldown - eliminates need for external thermal monitoring |
| Output Transistor Safe-Area Compensation | Prevents secondary breakdown during transient overloads - enhances reliability in dynamic load applications |
| No External Components Required | Operates with only two recommended capacitors (0.33 µF input, 0.1 µF output) - reduces design cycle time and board area |
Applications
| Industrial Sensor Interface | Portable Test Equipment |
|---|---|
Use Scenario: Powers analog front-end circuitry (op-amps, ADC drivers, signal conditioners) in factory-floor sensors requiring clean, stable 9 V supply. IC Role / Device Role / Timing Role: Linear regulator providing low-noise, ripple-free 9 V rail isolated from noisy 24 V plant bus. Use Value: 56 dB ripple rejection at 120 Hz attenuates switching noise from upstream SMPS, preserving sensor measurement accuracy. | Use Scenario: Supplies 9 V to microcontroller peripherals and display backlight circuits in handheld multimeters and oscilloscope probes. IC Role / Device Role / Timing Role: Primary voltage regulator converting battery-derived or USB-powered input to fixed 9 V for analog subsystems. Use Value: 500 mA output current supports simultaneous operation of LCD, MCU core, and analog signal chain without brownout. |
| Embedded Computing Power Rail | Legacy Industrial Control Module |
Use Scenario: Generates local 9 V supply for FPGA I/O banks or CPLD configuration circuitry on compact embedded compute boards. IC Role / Device Role / Timing Role: On-card linear regulator eliminating centralized supply distribution losses and noise coupling. Use Value: TO-252 thermal performance (RθJC = 1.4°C/W) enables full 500 mA delivery with minimal PCB copper area. | Use Scenario: Replaces aging discrete 9 V regulators in PLC I/O modules requiring drop-in compatibility and long-term component availability. IC Role / Device Role / Timing Role: Fixed-voltage replacement for legacy 7809-style regulators in DIN-rail mounted control hardware. Use Value: Pin-compatible with standard TO-220/TO-252 footprints and identical electrical behavior to legacy designs. |
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 |
|---|---|---|---|
| LM78M09CDT/NOPB | Same +9 V output, 500 mA rating, and TO-252 package; higher max input voltage (35 V) and wider temp range (−40°C to 125°C) | Supports extended industrial environments and higher input rails; slightly higher quiescent current (7.5 mA vs. 4.6–6 mA) | Select when operating below −40°C or above 26 V input is required |
| MC78M09BDTG | Identical electrical specs and TO-252-3 package; rated for −40°C to 125°C operation and AEC-Q100 Grade 3 qualified | Validated for automotive under-hood applications; same 56 dB ripple rejection and 2 V dropout | Select for automotive or high-reliability industrial deployments requiring qualification evidence |
Compared with LM78M09CDT/NOPB and MC78M09BDTG, UA78M09CKTPR offers lower bias current and tighter output tolerance in commercial-grade operation (0°C to 125°C), making it optimal for cost-sensitive, non-automotive embedded systems where input voltage stays ≤26 V.
Availability
UA78M09CKTPR is available at Aetrix Electronics and suitable for industrial sensor interfaces, portable test equipment, and embedded computing power rails requiring stable component supply and long-term sourcing continuity.
Supply support for UA78M09CKTPR 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 and industrial-grade components.
The UA78Mxx series was designed for robust, no-compromise linear regulation in space-constrained industrial and computing applications - emphasizing thermal resilience, intrinsic protection, and minimal external component count.
FAQ
What is the maximum input voltage for UA78M09CKTPR?
The absolute maximum input voltage for UA78M09CKTPR is 35 V, but the recommended operating range is 11.5 V to 26 V per TI's SLVS059T datasheet. Exceeding 26 V risks excessive power dissipation and thermal stress, especially at full 500 mA load. Operation at 35 V is only permitted under short-duration transient conditions with adequate heatsinking.
Does UA78M09CKTPR require external capacitors?
Yes, UA78M09CKTPR requires a 0.33 µF ceramic capacitor on the INPUT pin and a 0.1 µF ceramic capacitor on the OUTPUT pin for stability and noise suppression, as specified in the TI datasheet. Omitting either capacitor may cause oscillation, poor transient response, or degraded ripple rejection - particularly critical at 120 Hz line-related noise.
Is UA78M09CKTPR pin-compatible with other TO-252 3-pin regulators?
UA78M09CKTPR follows JEDEC TO-252-AC mechanical dimensions and has standard INPUT–COMMON–OUTPUT pinout (Pin 1–2–3), making it mechanically and electrically compatible with other TO-252-based +9 V regulators like LM78M09CDT and MC78M09BDTG. However, thermal pad layout and solder stencil design must match TI's KTP footprint recommendations.
What is the output voltage tolerance of UA78M09CKTPR over temperature?
UA78M09CKTPR guarantees an output voltage of +9.0 V with ±5% tolerance (8.55 V to 9.45 V) across its full operating junction temperature range of 0°C to 125°C and load range of 5 mA to 500 mA. This is verified per Electrical Characteristics table uA78M09C in SLVS059T Rev T.
Can UA78M09CKTPR be used in automotive applications?
UA78M09CKTPR is specified for 0°C to 125°C operation and is not AEC-Q100 qualified. For automotive use, TI recommends MC78M09BDTG (AEC-Q100 Grade 3) or LM78M09CDT/NOPB (−40°C to 125°C), both of which share identical electrical behavior but include automotive qualification and extended temperature validation. UA78M09CKTPR is intended for commercial and industrial environments only.
UA78M09CKTPR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Packaging:
- Digi-Reel®
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 26V
- Voltage - Output (Min/Fixed):
- 9V
- 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
UA78M09CKTPR FAQ
1.How can I place an order for UA78M09CKTPR through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78M09CKTPR 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 UA78M09CKTPR reliable?
The price and inventory of UA78M09CKTPR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78M09CKTPR is usually 5 days.
3.What payment methods are accepted for UA78M09CKTPR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA78M09CKTPR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for UA78M09CKTPR?
UA78M09CKTPR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA78M09CKTPR 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 UA78M09CKTPR?
For technical support, including UA78M09CKTPR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78M09CKTPR requirements.
6.How does Aetrix verify that UA78M09CKTPR is sourced from the original manufacturer or authorized distributors?
All UA78M09CKTPR 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 UA78M09CKTPR meets industry standards.
7.What is the process for return or replacement of UA78M09CKTPR?
All UA78M09CKTPR units undergo pre-shipment inspection (PSI). If there is an issue with UA78M09CKTPR, 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 UA78M09CKTPR part is unused and in its original packaging.
Return procedure for UA78M09CKTPR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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