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Texas Instruments TL1963A-33DCQT
- Part No.:
- TL1963A-33DCQT
- Manufacturer:
- Texas Instruments
- Package:
- SOT-223-6
- Datasheet:
-
TL1963A-33DCQT.pdf
- Description:
- IC REG LINEAR 3.3V 1.5A SOT223-6
- Quantity:
- Payment:
- Shipping:
Inventory:1,770
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Product details
Overview
TL1963A-33DCQT from Texas Instruments is a 3.3V fixed-output, 1.5A low-dropout linear regulator with 340mV typical dropout at full load, ±1.5% output accuracy over line/load/temperature, and 23μVRMS low-noise performance (10Hz–100kHz). It delivers stable power to noise-sensitive RF circuitry, medical imaging subsystems, and EV charging control logic.
For engineers reviewing the TL1963A-33DCQT datasheet, TL1963A-33DCQT pinout, TL1963A-33DCQT application, or TL1963A-33DCQT equivalent, key selection criteria include its 6-pin SOT-223 (DCQ) package, reverse-current and thermal shutdown protection, 10μF minimum output capacitance requirement, and compatibility with ceramic capacitors up to 3Ω ESR.
Technical Context
The TL1963A-33DCQT implements a PMOS pass transistor architecture enabling fast transient response and low dropout voltage. Its internal error amplifier uses the SENSE pin for precision feedback, and the SHDN pin provides enable/disable control with 0.25V–2V logic thresholds.
Designed as a "new chip" variant, it supports tighter output accuracy (±1.5%) only in DCQ and KTT packages, excludes reverse-battery protection, and specifies input voltage range of 2.4V–20V with UVLO rising threshold of 2.2V and hysteresis of 150mV.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.3V with ±1.5% tolerance across –40°C to +125°C junction temperature, line, and load |
| Max Output Current | 1.5A continuous; current limit set to 1.6A min over temperature for safe overload handling |
| Dropout Voltage | 340mV typical at IOUT = 1.5A and TJ = 25°C; increases to 550mV max at TJ = –40°C to +125°C |
| Output Noise | 23μVRMS (10Hz–100kHz) with 10μF ceramic output capacitor - suitable for RF supply rails |
| Input Voltage Range | 2.4V to 20V; includes under-voltage lockout (UVLO) with 2.2V rising threshold and 150mV hysteresis |
| Thermal Protection | Thermal shutdown activates at 150°C (rising), with hysteresis down to 130°C (falling) |
| Reverse-Current Protection | Active protection engages when VOUT – VIN exceeds 25mV; response time ≤5µs |
Pinout & Package
TL1963A-33DCQT is housed in a 6-pin SOT-223 (DCQ) package measuring 6.50mm × 7.06mm, with exposed thermal pad connected to GND for optimal thermal performance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: SHDN | Enable control input | Logic-high (>2V) enables regulator; logic-low (<0.25V) disables output and reduces quiescent current to 1.5µA |
| 2: IN | Main power input | Accepts 2.4V–20V input; requires ≥1µF ceramic input capacitor placed close to pin |
| 3: GND | Ground reference | Primary ground return for internal circuitry and thermal pad connection point |
| 4: OUT | Regulated output | Delivers 3.3V/1.5A; requires ≥10µF ceramic capacitor (ESR ≤3Ω) directly at pin for stability |
| 5: SENSE | Feedback sense input | Monitors regulated output voltage; enables high-accuracy regulation independent of PCB trace resistance |
| 6: GND | Secondary ground terminal | Dedicated ground path for SENSE loop; improves PSRR and load regulation accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Low-noise regulation | 23μVRMS output noise enables clean power for RF receivers, ADC references, and analog front-ends |
| Fast transient response | Stable with 10μF ceramic output capacitor and supports rapid load steps without overshoot/excessive droop |
| Reverse-current blocking | Prevents backflow from output to input during shutdown or input brownout - protects upstream sources |
| Thermal shutdown with hysteresis | Shuts down at 150°C and re-enables only after cooling to 130°C, preventing thermal cycling damage |
| SENSE pin Kelvin connection | Enables accurate remote sensing to compensate for PCB trace IR drop in high-current layouts |
Applications
| EV Charging Control Unit | Medical Imaging Power Subsystem |
|---|---|
Use Scenario: Supplies 3.3V to microcontroller, CAN transceiver, and isolation gate drivers in AC/DC charging station control board. IC Role / Device Role / Timing Role: Primary LDO delivering tightly regulated, low-noise 3.3V rail for digital logic and communication interfaces. Use Value: ±1.5% output accuracy ensures reliable MCU operation across wide ambient temperatures; reverse-current protection prevents battery-backfeed during input loss. | Use Scenario: Powers FPGA configuration memory and analog sensor interface circuits in portable ultrasound equipment. IC Role / Device Role / Timing Role: Low-noise 3.3V source for mixed-signal signal chain components requiring minimal supply-induced jitter. Use Value: 23μVRMS noise floor preserves SNR in high-resolution ADC stages; fast transient response maintains regulation during burst-mode imaging loads. |
| ATE Semiconductor Test Fixture | Energy Storage System BMS |
Use Scenario: Provides stable 3.3V to precision DACs, multiplexers, and level-shifting ICs in automated test equipment channel cards. IC Role / Device Role / Timing Role: Precision voltage reference source for calibration-critical analog stimulus and measurement paths. Use Value: Load regulation of ≤16.5mV over 1mA–1.5A ensures consistent DAC reference voltage; SENSE pin enables remote sensing for layout-insensitive accuracy. | Use Scenario: Supplies 3.3V to cell monitoring ICs and isolated RS-485 transceivers in lithium-ion battery pack management systems. IC Role / Device Role / Timing Role: Robust local regulator tolerant of wide input transients and reverse-polarity events in harsh vehicle environments. Use Value: UVLO with 150mV hysteresis prevents erratic startup during battery voltage sag; thermal shutdown protects against enclosure overheating during high-ambient operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLS850F3TLE | Automotive-grade AEC-Q100 qualified; 500mA output; integrated watchdog and reset functions | Targeted for automotive body electronics; lacks 1.5A capability and low-noise optimization | Select for automotive safety-critical systems requiring qualification and system monitoring features |
| TPS7A4701RGWR | Ultra-low noise (4.7μVRMS); 1A output; adjustable output; higher cost and larger WQFN package | Better suited for ultra-sensitive analog circuits (e.g., RF synthesizers), not high-current digital loads | Select when sub-5μVRMS noise is mandatory and 1A output suffices; avoid where 1.5A and SOT-223 footprint are required |
Compared with TLS850F3TLE and TPS7A4701RGWR, TL1963A-33DCQT uniquely balances 1.5A output, 23μVRMS noise, SOT-223 thermal performance, and industrial-grade reliability - making it optimal for high-current, noise-sensitive embedded power rails where automotive qualification or ultra-low noise are not primary requirements.
Availability
TL1963A-33DCQT is available at Aetrix Electronics and suitable for EV charging infrastructure, medical imaging equipment, and energy storage systems requiring stable component supply with long-term industrial lifecycle support.
Supply support for TL1963A-33DCQT 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 and embedded processing technologies, with decades of expertise in power management IC design.
The TL1963A product line targets high-current, low-noise LDO applications in industrial, medical, and test equipment - emphasizing robustness, fast transient response, and precision regulation without requiring external compensation.
FAQ
What is the maximum input voltage rating for TL1963A-33DCQT?
The TL1963A-33DCQT has an absolute maximum input voltage rating of 20.2V for the new-chip revision. Operation above this voltage risks permanent damage. The recommended operating range is 2.4V to 20V, with UVLO ensuring reliable startup only above 2.2V (rising threshold).
Does TL1963A-33DCQT require an external resistor divider for 3.3V output?
No - TL1963A-33DCQT is a fixed-output variant; the 3.3V regulation is internally set. The SENSE pin connects directly to the OUT pin for feedback, eliminating need for external resistors. The ADJ pin is not present in fixed versions like TL1963A-33DCQT.
Can TL1963A-33DCQT be used with aluminum electrolytic output capacitors?
No - TL1963A-33DCQT requires a minimum 10μF output capacitor with ESR ≤3Ω and is optimized for ceramic types. Aluminum electrolytics typically exceed 3Ω ESR and lack the low-impedance profile needed for stability and fast transient response; using them may cause oscillation or poor regulation.
What thermal performance can be expected from TL1963A-33DCQT in the DCQ package?
In the 6-pin SOT-223 (DCQ) package, TL1963A-33DCQT achieves a junction-to-ambient thermal resistance (RθJA) of 50.5°C/W under legacy device conditions. With proper PCB copper area and thermal pad soldering, it sustains 1.5A output at up to +125°C ambient when input-to-output differential is ≤1.5V.
Is reverse-battery protection supported on TL1963A-33DCQT?
No - reverse-battery protection is exclusive to the legacy-chip version of TL1963A. TL1963A-33DCQT is a new-chip variant and does not include this feature. It does provide reverse-current protection (blocking flow from OUT to IN when VOUT > VIN by >25mV), but not full reverse-polarity input tolerance.
TL1963A-33DCQT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- SOT-223-6
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 20V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.55V @ 1.5A
- Current - Output:
- 1.5A
- Current - Quiescent (Iq):
- 1 mA
- Current - Supply (Max):
- 80 mA
- PSRR:
- 63dB (120Hz)
- Control Features:
- Enable
- Protection Features:
- Over Temperature, Reverse Polarity
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-6
TL1963A-33DCQT FAQ
1.How can I place an order for TL1963A-33DCQT through Aetrix?
Please submit a Request for Quotation (RFQ) for TL1963A-33DCQT 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 TL1963A-33DCQT reliable?
The price and inventory of TL1963A-33DCQT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for TL1963A-33DCQT is usually 5 days.
3.What payment methods are accepted for TL1963A-33DCQT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for TL1963A-33DCQT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for TL1963A-33DCQT?
TL1963A-33DCQT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your TL1963A-33DCQT 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 TL1963A-33DCQT?
For technical support, including TL1963A-33DCQT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your TL1963A-33DCQT requirements.
6.How does Aetrix verify that TL1963A-33DCQT is sourced from the original manufacturer or authorized distributors?
All TL1963A-33DCQT 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 TL1963A-33DCQT meets industry standards.
7.What is the process for return or replacement of TL1963A-33DCQT?
All TL1963A-33DCQT units undergo pre-shipment inspection (PSI). If there is an issue with TL1963A-33DCQT, 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 TL1963A-33DCQT part is unused and in its original packaging.
Return procedure for TL1963A-33DCQT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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