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Diodes Incorporated ZLDO1117G33TA
- Part No.:
- ZLDO1117G33TA
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
ZLDO1117G33TA.pdf
- Description:
- IC REG LINEAR 3.3V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:4,927
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Product details
Overview
ZLDO1117G33TA from Diodes Incorporated is a fixed-output 3.3V, 1A low-dropout linear regulator in SOT223 package, featuring 1.2V max dropout at full load, ±2% output voltage tolerance over industrial temperature range (−40°C to +125°C), and compatibility with MLCC output capacitors down to 4.7µF. It delivers stable 3.3V power for logic supplies and high-speed bus termination in automotive and industrial control systems.
For engineers reviewing the ZLDO1117G33TA datasheet, ZLDO1117G33TA pinout, ZLDO1117G33TA application, or ZLDO1117G33TA equivalent, key selection criteria include dropout voltage under 1.2V at 1A, thermal shutdown protection, AEC-Q100 Grade 2 qualification, and stability with low-ESR ceramic capacitors - critical for compact, thermally constrained embedded designs.
Technical Context
The ZLDO1117G33TA integrates a precision 1.25V bandgap reference and error amplifier to regulate output at 3.3V with line/load regulation of ≤0.2% and ≤6.6mV respectively. Its internal current limiting and thermal shutdown circuitry activate at ≥150°C junction temperature, ensuring safe operation during overload or ambient thermal stress.
Designed for quasi-LDO performance, it achieves fast transient response using internal compensation optimized for 4.7µF X7R MLCCs (ESR ≤0.5Ω), eliminating need for tantalum or electrolytic capacitors. Ripple rejection reaches 80dB at 120Hz with proper bypassing, supporting noise-sensitive analog and digital subsystems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±2% (guaranteed across −40°C to +125°C, 10mA–1A load) |
| Max Dropout Voltage | 1.2V at 1A load (enables regulation with VIN as low as 4.5V) |
| Load Regulation | 6.6mV max (ensures <0.2% output shift from no-load to full-load) |
| Quiescent Current | 4–10mA (low static power draw supports battery-backed or always-on systems) |
| Ripple Rejection | 80dB at 120Hz (suppresses input ripple without external filtering) |
| Junction Temp Range | −40°C to +125°C (supports under-hood automotive and industrial environments) |
| Thermal Shutdown | Activates at ~150°C (self-protects against sustained overloads or poor PCB heatsinking) |
Pinout & Package
SOT223-3L package with exposed thermal pad (Tab = VOUT); footprint optimized for 2 oz copper, 5.6mm×5.6mm pad per AP02001; θJA = 107°C/W (no airflow, 2″×2″ polyimide PCB).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Reference node / Ground return | Fixed 3.3V variant: internally tied to GND; provides bias reference for internal error amplifier |
| 2 (VOUT) | Regulated output | Delivers 3.3V ±2%; requires ≥4.7µF MLCC (X7R) with ESR ≤0.5Ω for stability |
| 3 (VIN) | Unregulated input | Accepts 4.7V–18V; must remain ≥1.3V above VOUT to maintain regulation |
Key Features
| Feature | Design Value |
|---|---|
| MLCC-compatible stability | Stable with 4.7µF X7R ceramic (ESR ≤0.5Ω), reducing BOM cost and board space vs. tantalum |
| AEC-Q100 Grade 2 qualified | Validated for automotive applications up to +105°C ambient (TJ ≤ +125°C) |
| Fault protection | Integrated current limit and thermal shutdown prevent damage during short-circuit or overheating |
| Low-noise regulation | 80dB ripple rejection at 120Hz enables clean supply for ADCs, sensors, and PLLs |
| Green packaging | Halogen- and antimony-free, RoHS-compliant SOT223 with lead-free finish |
Applications
| Automotive Body Control Module | Industrial PLC I/O Power |
|---|---|
|
Use Scenario: Powering 3.3V CAN transceivers and microcontroller I/O banks in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying noise-sensitive communication interfaces and GPIO peripherals. Use Value: AEC-Q100 qualification and −40°C to +125°C operation ensure reliability in under-hood thermal cycling; 1.2V dropout allows use with degraded 5V rail during cold-crank conditions. |
Use Scenario: Providing isolated 3.3V logic supply for digital input/output cards in programmable logic controllers. IC Role / Device Role / Timing Role: Local point-of-load regulator delivering stable voltage to FPGA configuration I/O and optocoupler drivers. Use Value: Fast transient response maintains voltage within ±1% during rapid 100mA–1A load steps from relay switching; MLCC compatibility simplifies layout in dense I/O card stacks. |
| Medical Patient Monitor Sensor Interface | Networking Equipment Management MCU |
|
Use Scenario: Biasing precision analog front-ends (AFE) and low-power ADCs in portable diagnostic devices. IC Role / Device Role / Timing Role: Low-noise 3.3V supply for signal conditioning circuits requiring <10µV RMS ripple. Use Value: 80dB ripple rejection eliminates need for additional LC filtering; ±2% tolerance ensures accurate sensor calibration across operating temperature range. |
Use Scenario: Powering ARM Cortex-M based management MCUs and Ethernet PHYs in enterprise switches and routers. IC Role / Device Role / Timing Role: Secondary regulated rail for non-core logic, enabling independent power sequencing and brown-out detection. Use Value: Thermal shutdown prevents latch-up during firmware update-induced CPU load spikes; SOT223 thermal pad enables direct PCB copper pour for passive cooling in fanless enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 3.3V LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/MB | 250mA output, 6µA quiescent current, SOT23-5 package | Limited to ultra-low-power microcontrollers; insufficient for 1A bus termination loads | Select only for battery-powered IoT nodes where standby current dominates design priority |
| TLV73333PDBVR | 300mA output, 50µA IQ, 170mV dropout at 300mA, SOT-23-5 | Cannot support 1A loads; lower thermal mass increases risk of thermal shutdown in continuous operation | Prefer for space-constrained, low-current auxiliary rails - not suitable as drop-in replacement for ZLDO1117G33TA's 1A capability |
Compared with MCP1700T-3302E/MB and TLV73333PDBVR, ZLDO1117G33TA uniquely combines 1A output, 1.2V dropout, and AEC-Q100 qualification in SOT223 - making it the only option among the three capable of powering automotive 3.3V bus interfaces while maintaining thermal safety margins under full load.
Availability
ZLDO1117G33TA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, and medical sensor interface designs requiring stable component supply with long-term lifecycle assurance.
Supply support for ZLDO1117G33TA 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.
ZLDO1117G33TA belongs to the ZLDO1117 family of high-reliability LDO regulators designed specifically for demanding automotive and industrial applications requiring extended temperature operation and AEC-Q100 compliance.
FAQ
What is the minimum input voltage required for ZLDO1117G33TA to maintain regulation?
The minimum input voltage is 4.7V - derived from the 3.3V output plus the guaranteed maximum dropout of 1.2V at 1A load. Below this, the device enters dropout mode and output voltage drops linearly with input. The datasheet specifies 4.7V as the lower bound of recommended operating conditions for full-load 3.3V regulation.
Can ZLDO1117G33TA be used with 2.2µF ceramic capacitors instead of the specified 4.7µF?
No - 4.7µF is the absolute minimum output capacitance required for loop stability, as validated in the datasheet's SOA and transient response testing. Using 2.2µF risks oscillation or excessive overshoot during load steps, especially with X7R dielectrics below 125°C. The 4.7µF value assumes ESR between 0.05Ω and 0.5Ω.
Does ZLDO1117G33TA require an input capacitor?
An input capacitor is recommended but not strictly required for stability - it prevents input voltage sag during load transients. Diodes recommends ≥1µF ceramic near the VIN pin when the regulator is not located close to the main power supply filter; larger values improve immunity to upstream ripple and source impedance effects.
How does the thermal shutdown behavior manifest during sustained overload?
When junction temperature reaches ~150°C, the internal thermal limiter disables the pass transistor, dropping VOUT to near zero. After die cooling by ~20°C, the regulator auto-restarts. This hiccup-mode cycling protects against permanent damage but causes intermittent output - design must ensure adequate PCB copper area (θJA ≤107°C/W) or derate load current in high-ambient environments.
ZLDO1117G33TA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- 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):
- 18V
- Voltage - Output (Min/Fixed):
- 3.3V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 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 ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
ZLDO1117G33TA FAQ
1.How can I place an order for ZLDO1117G33TA through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117G33TA 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 ZLDO1117G33TA reliable?
The price and inventory of ZLDO1117G33TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117G33TA is usually 5 days.
3.What payment methods are accepted for ZLDO1117G33TA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117G33TA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117G33TA?
ZLDO1117G33TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117G33TA 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 ZLDO1117G33TA?
For technical support, including ZLDO1117G33TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117G33TA requirements.
6.How does Aetrix verify that ZLDO1117G33TA is sourced from the original manufacturer or authorized distributors?
All ZLDO1117G33TA 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 ZLDO1117G33TA meets industry standards.
7.What is the process for return or replacement of ZLDO1117G33TA?
All ZLDO1117G33TA units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117G33TA, 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 ZLDO1117G33TA part is unused and in its original packaging.
Return procedure for ZLDO1117G33TA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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