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Diodes Incorporated ZLDO1117QG33TA
- Part No.:
- ZLDO1117QG33TA
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZLDO1117QG33TA.pdf
- Description:
- IC REG LINEAR 3.3V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,453
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Product details
Overview
ZLDO1117QG33TA from Diodes Incorporated is an AEC-Q100 Grade 2 qualified, automotive-compliant 3.3V fixed-output low-dropout linear regulator in SOT223 package delivering 1A output current with ≤1.2V dropout at full load, ±2% output voltage tolerance over -40°C to +105°C, and stable operation with 4.7µF MLCC output capacitors. It supplies regulated 3.3V power for automotive infotainment SoC I/O rails and industrial PLC digital logic subsystems.
For engineers reviewing the ZLDO1117QG33TA datasheet, ZLDO1117QG33TA pinout, ZLDO1117QG33TA application, or ZLDO1117QG33TA equivalent, key selection criteria include dropout voltage under 1A load, thermal shutdown behavior at +150°C junction temperature, MLCC compatibility, AEC-Q100 qualification status, and SOT223 thermal resistance (θJA = 107°C/W).
Technical Context
The ZLDO1117QG33TA implements a quasi-LDO architecture with internal 1.25V reference and feedback network optimized for fixed 3.3V output. Its regulation loop maintains stability with low-ESR ceramic capacitors (0.05Ω–0.5Ω), enabling fast transient response during digital load steps.
Thermal protection activates at +150°C junction temperature, cycling output off/on during overload. Input-to-output differential must exceed 1.5V for regulation; minimum input voltage is 4.7V (3.3V + 1.4V) per recommended operating conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±2% (guaranteed across -40°C to +105°C ambient, 10mA–1A load) |
| Dropout Voltage | 1.2V max at 1A load (ensures regulation down to VIN = 4.5V) |
| Output Current | 1A continuous (with thermal derating above +85°C ambient) |
| Quiescent Current | 4–10mA (low no-load consumption for battery-sensitive automotive modules) |
| Ripple Rejection | 60–80dB at 120Hz (enables clean 3.3V supply from noisy 12V automotive bus) |
| Thermal Shutdown | Activates at +150°C junction temperature (self-protecting during sustained overload) |
| Operating Temp | -40°C to +105°C ambient (AEC-Q100 Grade 2 qualified for engine bay & cabin electronics) |
Pinout & Package
SOT223 package with exposed tab connected to VOUT for thermal conduction; 3-pin surface-mount configuration optimized for PCB heat spreading on 2oz copper.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1: ADJ/GND | Reference node / ground return | Fixed 3.3V variant ties this pin directly to system ground; serves as feedback reference point for internal divider |
| 2: VOUT | Regulated output | Exposed tab connects internally to this pin; requires ≥4.7µF MLCC (ESR ≤0.5Ω) for stability and transient response |
| 3: VIN | Unregulated input | Must be ≥1.5V above VOUT (≥4.8V) for regulation; connects to bulk storage capacitor near power entry point |
Key Features
| Feature | Design Value |
|---|---|
| MLCC-compatible stability | Guaranteed stable with 4.7µF X7R ceramic (0.05Ω–0.5Ω ESR), eliminating need for bulky tantalum |
| Fast transient response | ≤10mV output deviation during 100mA→500mA load step (measured with 4.7µF MLCC) |
| AEC-Q100 qualification | Grade 2 qualified (-40°C to +105°C ambient), PPAP-capable, manufactured in IATF16949 facilities |
| Low-noise regulation | 60–80dB ripple rejection at 120Hz enables direct use after rectified alternator output |
| Thermal & current protection | Integrated thermal shutdown and current limiting prevent damage during short-circuit or overtemperature events |
Applications
| Automotive Infotainment Power | Industrial PLC Digital I/O |
|---|---|
|
Use Scenario: Supplying 3.3V to HDMI transmitter ICs and USB PHYs in head-unit systems exposed to 12V battery transients. IC Role / Device Role / Timing Role: Primary post-regulator converting filtered 5V rail to noise-immune 3.3V for high-speed interface logic. Use Value: 80dB ripple rejection suppresses alternator switching noise; AEC-Q100 qualification ensures reliability across vehicle lifetime. |
Use Scenario: Powering isolated digital input buffers and microcontroller GPIO banks in factory-floor programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering stable 3.3V to noise-sensitive level-shifting circuits. Use Value: 1.2V dropout enables operation from 4.8V backup rails during brownout; -40°C to +105°C rating supports uncooled enclosures. |
| Automotive Body Control Module | Medical Diagnostic Equipment |
|
Use Scenario: Providing 3.3V to CAN transceiver bias rails and LIN bus microcontrollers in door module ECUs. IC Role / Device Role / Timing Role: Low-quiescent-current LDO supplying always-on logic while meeting automotive sleep-mode leakage budgets. Use Value: 4–10mA quiescent current minimizes battery drain during vehicle park mode; thermal shutdown prevents fault propagation. |
Use Scenario: Regulating 3.3V for FPGA configuration memory and ADC reference buffers in portable ultrasound devices. IC Role / Device Role / Timing Role: Precision voltage source maintaining <±2% accuracy across patient-room temperature swings. Use Value: ±2% tolerance over full temperature range eliminates need for external trimming; MLCC compatibility reduces board area vs. tantalum. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| NCP1117ST33T3G | Commercial-grade (non-AEC-Q100), θJA = 120°C/W (SOT223), 1.25V dropout at 1A | Lacks automotive qualification, higher thermal resistance limits power density in compact designs | Select only for non-automotive industrial use where AEC-Q100 is not required |
| TLV73333PDBVR | Lower IQ (50µA), smaller SOT-23 package, 300mA output, 170mV dropout at 300mA | Insufficient current for 1A loads; unsuitable for high-power digital logic rails | Choose only for ultra-low-power, space-constrained applications below 300mA |
Compared with NCP1117ST33T3G, ZLDO1117QG33TA provides guaranteed automotive qualification and lower thermal resistance; versus TLV73333PDBVR, it delivers triple the output current at the cost of higher quiescent current-making it optimal for 1A automotive 3.3V rails where reliability and power density are critical.
Availability
ZLDO1117QG33TA is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLCs, and medical diagnostic equipment requiring stable component supply with AEC-Q100 compliance and extended temperature support.
Supply support for ZLDO1117QG33TA 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
Diodes Incorporated is a global semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for automotive, industrial, and consumer markets.
The ZLDO1117Q series belongs to Diodes' automotive-qualified LDO portfolio, designed specifically for demanding vehicular environments requiring AEC-Q100 Grade 2 reliability, wide temperature operation, and robust transient performance.
FAQ
What is the minimum input voltage required for regulation at 3.3V output?
The ZLDO1117QG33TA requires VIN ≥ 4.8V (3.3V + 1.5V) to maintain regulation under full 1A load, per Recommended Operating Conditions. Below this, the device enters dropout mode with degraded line regulation but continues to conduct. The absolute minimum VIN is 2.7V, though regulation is not guaranteed below 4.8V.
Can the ZLDO1117QG33TA be used with ceramic capacitors?
Yes-the ZLDO1117QG33TA is explicitly characterized for stability with 4.7µF X7R MLCCs (ESR 0.05Ω–0.5Ω). Unlike legacy 1117 regulators, it does not require high-ESR tantalum or aluminum electrolytics, enabling smaller footprint and improved transient response without oscillation risk.
Does this part have built-in reverse polarity protection?
No, the ZLDO1117QG33TA lacks integrated reverse-voltage protection. An external Schottky diode between VIN and GND is recommended if the input may be subjected to reverse polarity, as specified in the datasheet's "More Application Circuits" section to prevent latch-up or damage.
How does thermal performance differ between SOT223 and TO252 packages?
In identical PCB layouts, the TO252 (DPAK) package achieves θJA = 73°C/W versus 107°C/W for SOT223-offering ~32% better thermal efficiency. This allows ~1.5× higher continuous power dissipation at the same ambient temperature, making TO252 preferable for >700mA loads in thermally constrained automotive modules.
ZLDO1117QG33TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.2V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 105°C (TA)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZLDO1117QG33TA FAQ
1.How can I place an order for ZLDO1117QG33TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117QG33TA 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 ZLDO1117QG33TA reliable?
The price and inventory of ZLDO1117QG33TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117QG33TA is usually 5 days.
3.What payment methods are accepted for ZLDO1117QG33TA?
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4.How is shipping managed for ZLDO1117QG33TA?
ZLDO1117QG33TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117QG33TA 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 ZLDO1117QG33TA?
For technical support, including ZLDO1117QG33TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117QG33TA requirements.
6.How does Aetrix verify that ZLDO1117QG33TA is sourced from the original manufacturer or authorized distributors?
All ZLDO1117QG33TA 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 ZLDO1117QG33TA meets industry standards.
7.What is the process for return or replacement of ZLDO1117QG33TA?
All ZLDO1117QG33TA units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117QG33TA, 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 ZLDO1117QG33TA part is unused and in its original packaging.
Return procedure for ZLDO1117QG33TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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