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Texas Instruments UA78M33QDCYRQ1
- Part No.:
- UA78M33QDCYRQ1
- Manufacturer:
- Texas Instruments
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
UA78M33QDCYRQ1.pdf
- Description:
- IC REG LIN 3.3V 500MA SOT223-4
- Quantity:
- Payment:
- Shipping:
Inventory:1,120
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Product details
Overview
UA78M33QDCYRQ1 from Texas Instruments is an automotive-grade, fixed-output 3.3 V positive-voltage linear regulator in SOT-223 (DCY) package, delivering up to 500 mA output current with internal thermal-overload and short-circuit protection, designed for on-card regulation in automotive body control modules and infotainment power rails.
For engineers reviewing the UA78M33QDCYRQ1 datasheet, UA78M33QDCYRQ1 pinout, UA78M33QDCYRQ1 application, or UA78M33QDCYRQ1 equivalent, key selection considerations include dropout voltage (2 V), input voltage range (5.3–25 V), output voltage tolerance (±3% over −40°C to 125°C), ripple rejection (62 dB at 120 Hz), and automotive AEC-Q100 qualification.
Technical Context
This device implements a monolithic series-pass linear regulator architecture with built-in safe-area compensation for the output transistor, internal current limiting set at 300 mA short-circuit and 700 mA peak output, and bias current stabilization across temperature (4.5–6 mA typical). It requires no external components for basic operation but supports adjustable configurations via external resistors.
Thermal design is enabled by its SOT-223 package with θJA = 53°C/W and θJC = 4°C/W, supporting continuous 500 mA operation under controlled ambient conditions. The regulator maintains stable 3.3 V output with ≤100 mV line and load regulation and ≤200 µV RMS output noise (10 Hz–100 kHz).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.3 V ±3% (3.1–3.5 V over −40°C to 125°C), enabling direct powering of 3.3 V microcontrollers and CAN transceivers. |
| Max Output Current | 500 mA continuous, sufficient for MCU + peripheral rail in automotive domain controllers. |
| Input Voltage Range | 5.3 V to 25 V, compatible with 12 V automotive battery systems including cold-crank (down to ~6 V) and load-dump (up to 25 V). |
| Dropout Voltage | 2 V at 350 mA, requiring minimum 5.3 V input for stable 3.3 V output under full load. |
| Ripple Rejection | 62 dB at 120 Hz, suppressing alternator ripple and switching noise in vehicle electrical systems. |
| Thermal Protection | Internal thermal-overload shutdown with automatic recovery, preventing damage during sustained overload or poor heatsinking. |
| Short-Circuit Current | Limited to 300 mA at VI = 35 V, protecting downstream circuitry during wiring faults. |
Pinout & Package
SOT-223 (DCY) package: 4-pin surface-mount, thermally enhanced plastic small-outline with exposed thermal pad (pin 2 connected to common/ground). Dimensions: 6.7 mm × 3.7 mm × 1.8 mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (INPUT) | Unregulated input supply | Accepts 5.3–25 V DC; must be decoupled with ≥0.33 µF ceramic capacitor close to pin. |
| 2 (COMMON) | Ground reference and thermal pad | Primary ground return path and main thermal conduction path to PCB copper; must be soldered to ≥1 cm² copper pour. |
| 3 (OUTPUT) | Regulated 3.3 V output | Delivers up to 500 mA; requires ≥0.1 µF ceramic output capacitor for stability and transient response. |
| 4 (COMMON) | Secondary ground terminal | Redundant ground connection for improved current handling and lower impedance return path; tied internally to pin 2. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 qualified | Rated for automotive applications (−40°C to 125°C TJ), with production flow per automotive quality standards. |
| No external components required | Operates as standalone regulator with only input/output capacitors-reduces BOM count and layout area. |
| Internal safe-area compensation | Prevents second breakdown of output transistor during overload or high-VCE conditions, enhancing reliability in transient-rich environments. |
| Thermal shutdown with hysteresis | Shuts down at ~150°C junction temperature and restarts after cooldown (~140°C), enabling fault-tolerant operation without latch-up. |
| Low output noise | 40–200 µV RMS (10 Hz–100 kHz), minimizing interference in sensitive analog and RF subsystems. |
Applications
| Body Control Module (BCM) | Instrument Cluster Display |
|---|---|
Use Scenario: Powering 3.3 V microcontroller, LIN transceiver, and sensor interface circuitry in vehicle door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 3.3 V local regulator converting 12 V battery to clean logic supply; provides stable voltage despite battery fluctuations and load dumps. Use Value: Enables reliable MCU operation during cold-crank (≥6 V input) and meets automotive EMI requirements via integrated ripple rejection and low noise. | Use Scenario: Supplying TFT-LCD controller, touch controller, and backlight driver ICs in digital instrument clusters. IC Role / Device Role / Timing Role: Fixed 3.3 V rail generator with fast transient response for display pixel clocking and data interface timing integrity. Use Value: Maintains <±3% output accuracy across temperature, ensuring consistent display brightness and color fidelity without external trimming. |
| Telematics Control Unit (TCU) | ADAS Camera Power Subsystem |
Use Scenario: Providing regulated 3.3 V supply to cellular modem baseband processor and GNSS receiver in vehicle connectivity units. IC Role / Device Role / Timing Role: Low-noise, high-rejection regulator isolating sensitive RF sections from noisy power domains. Use Value: 62 dB ripple rejection suppresses alternator noise, preventing bit errors in LTE/GNSS signal acquisition and tracking. | Use Scenario: Powering image signal processor (ISP) and serializer ICs in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Local point-of-load regulator placed near camera sensor PCB to minimize IR drop and noise coupling. Use Value: 500 mA output capability supports dual-lane MIPI CSI-2 interfaces; thermal robustness ensures operation inside sealed camera housings. |
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 |
|---|---|---|---|
| TLV73333PQDBVRQ1 | Lower dropout (300 mV @ 300 mA), higher PSRR (65 dB @ 1 kHz), but max 300 mA output current. | Better suited for low-input-voltage scenarios (e.g., 5 V rail); insufficient for 500 mA loads like multi-peripheral MCUs. | Select when input headroom is constrained and load current ≤300 mA; not a drop-in replacement due to lower current rating and different pinout. |
| TPS7B6933QDCYRQ1 | Higher PSRR (70 dB @ 100 Hz), tighter output tolerance (±2%), same 500 mA rating and SOT-223 package. | Designed specifically for automotive CAN/LIN transceivers; includes enable pin and higher ESD rating (±7 kV HBM). | Preferred for new designs requiring enhanced noise immunity and functional safety support; pin-compatible but requires enable logic integration. |
Compared with TLV73333PQDBVRQ1 and TPS7B6933QDCYRQ1, UA78M33QDCYRQ1 offers proven ruggedness and simplicity for cost-sensitive, high-current automotive rails where ultra-low dropout or advanced enable control are not required.
Availability
UA78M33QDCYRQ1 is available at Aetrix Electronics and suitable for automotive body electronics, instrument cluster power management, and telematics control units requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for UA78M33QDCYRQ1 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 headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The uA78Mxx-Q1 series is part of TI's automotive-qualified linear regulator portfolio, engineered for robust on-board power conversion in harsh vehicular environments with emphasis on thermal resilience, fault tolerance, and AEC-Q100 compliance.
FAQ
What is the maximum input voltage rating for UA78M33QDCYRQ1?
The absolute maximum input voltage for UA78M33QDCYRQ1 is 35 V, but the recommended operating input voltage range is 5.3 V to 25 V. Operation above 25 V risks exceeding thermal limits under load, and sustained use at 35 V is prohibited per absolute maximum ratings. For automotive applications, this accommodates load-dump transients up to 25 V while maintaining safe junction temperature.
Does UA78M33QDCYRQ1 require external capacitors to operate stably?
Yes, UA78M33QDCYRQ1 requires a minimum 0.33 µF ceramic capacitor on the input and a minimum 0.1 µF ceramic capacitor on the output, placed as close as possible to their respective pins. These capacitors ensure stability, improve transient response, and reduce high-frequency noise. Omitting them may cause oscillation or poor regulation, especially under dynamic load conditions encountered in automotive systems.
Is UA78M33QDCYRQ1 pin-compatible with standard UA78M33 variants?
No-UA78M33QDCYRQ1 uses the SOT-223 (DCY) package with four terminals (INPUT, COMMON, OUTPUT, COMMON), whereas non-Q1 catalog versions like UA78M33CKTTR may use TO-220 or KTP packages with different pinouts and thermal characteristics. The Q1 suffix denotes AEC-Q100 qualification, and the DCY package designation confirms the specific 4-pin SOT-223 footprint; mechanical and thermal design must be verified per TI's MPDS094A drawing.
What is the output voltage tolerance of UA78M33QDCYRQ1 over temperature and load?
UA78M33QDCYRQ1 guarantees an output voltage of 3.3 V with ±3% tolerance (3.1–3.5 V) across the full operating junction temperature range of −40°C to 125°C and output load current from 5 mA to 500 mA. At room temperature and 350 mA load, typical output is 3.3 V ±0.1 V (3.2–3.4 V), as specified in the electrical characteristics table.
How does UA78M33QDCYRQ1 handle thermal overload conditions?
UA78M33QDCYRQ1 features internal thermal-overload protection that disables the output transistor when junction temperature reaches approximately 150°C. Once the die cools to ~140°C, the regulator automatically resumes operation. This hysteresis prevents cycling and enables self-recovery during temporary overheating-critical for automotive under-hood applications where airflow is limited and ambient temperatures exceed 85°C.
UA78M33QDCYRQ1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- 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):
- 3.3V
- 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:
- -40°C ~ 125°C
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-4
UA78M33QDCYRQ1 FAQ
1.How can I place an order for UA78M33QDCYRQ1 through Aetrix?
Please submit a Request for Quotation (RFQ) for UA78M33QDCYRQ1 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 UA78M33QDCYRQ1 reliable?
The price and inventory of UA78M33QDCYRQ1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for UA78M33QDCYRQ1 is usually 5 days.
3.What payment methods are accepted for UA78M33QDCYRQ1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for UA78M33QDCYRQ1 transactions.
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4.How is shipping managed for UA78M33QDCYRQ1?
UA78M33QDCYRQ1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your UA78M33QDCYRQ1 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 UA78M33QDCYRQ1?
For technical support, including UA78M33QDCYRQ1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your UA78M33QDCYRQ1 requirements.
6.How does Aetrix verify that UA78M33QDCYRQ1 is sourced from the original manufacturer or authorized distributors?
All UA78M33QDCYRQ1 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 UA78M33QDCYRQ1 meets industry standards.
7.What is the process for return or replacement of UA78M33QDCYRQ1?
All UA78M33QDCYRQ1 units undergo pre-shipment inspection (PSI). If there is an issue with UA78M33QDCYRQ1, 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 UA78M33QDCYRQ1 part is unused and in its original packaging.
Return procedure for UA78M33QDCYRQ1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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