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Diodes Incorporated ZLDO1117K33TC
- Part No.:
- ZLDO1117K33TC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ZLDO1117K33TC.pdf
- Description:
- IC REG LINEAR 3.3V 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,857
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Product details
Overview
ZLDO1117K33TC from Diodes Incorporated is a fixed-output 3.3V, 1A low dropout linear regulator in TO252 package, featuring 1.2V maximum dropout at full load, ±2% output voltage tolerance over industrial temperature range (−40°C to +125°C), and guaranteed stability with 4.7µF MLCC output capacitors. It delivers tightly regulated power for 3.3V logic supplies in automotive infotainment modules and industrial I/O interfaces.
For engineers reviewing the ZLDO1117K33TC datasheet, ZLDO1117K33TC pinout, ZLDO1117K33TC application, or ZLDO1117K33TC equivalent, key selection criteria include dropout voltage under 1.2V at 1A, thermal shutdown protection, AEC-Q100 Grade 2 qualification, and compatibility with low-ESR ceramic capacitors - all critical for high-reliability embedded power rails.
Technical Context
The ZLDO1117K33TC employs a bandgap reference and error amplifier architecture to maintain regulation across input voltages from 4.7V to 18V while delivering up to 1A output current. Its internal thermal shutdown activates at +150°C junction temperature, and current limiting prevents damage during short-circuit events.
Designed for direct replacement of legacy 1117-family regulators, it achieves fast transient response via optimized internal compensation and supports stable operation with MLCCs (ESR ≤ 0.5Ω), eliminating need for bulk tantalum or electrolytic capacitors. The fixed 3.3V output eliminates external feedback resistors, reducing BOM count and layout sensitivity.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300 V ±2% (guaranteed across −40°C to +125°C, line/load) |
| Max Dropout Voltage | 1.2 V at 1A load (enables regulation with VIN as low as 4.5V) |
| Output Current | 1 A continuous (with thermal derating above +85°C ambient) |
| Quiescent Current | 4–10 mA (low no-load consumption improves system efficiency) |
| Ripple Rejection | 60–80 dB at 120 Hz (suppresses switching noise from upstream DC/DC stages) |
| Thermal Shutdown | Activates at +150°C junction temperature (self-protecting under overload) |
| Input Voltage Range | 4.7 V to 18 V (supports 5V/12V rail inputs with margin) |
Pinout & Package
Package: TO252-3L (DPAK), surface-mount, thermally enhanced with exposed tab connected to VOUT for improved heat dissipation (θJC = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Ground reference terminal | Internally tied to GND for fixed-output variants; provides bias reference for internal regulator circuitry |
| 2 (VOUT) | Regulated output node | Delivers stable 3.3V; requires ≥4.7µF MLCC (ESR ≤ 0.5Ω) to ground for loop stability |
| 3 (VIN) | Unregulated input supply | Must remain ≥1.3V above VOUT to maintain regulation; connects to bulk input capacitor |
| Tab | Thermal pad / electrical connection | Electrically connected to VOUT; must be soldered to large copper pour for thermal management |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualified | Validated for automotive applications requiring −40°C to +125°C operation and PPAP compliance |
| MLCC-compatible stability | Stable with 4.7µF X7R ceramic capacitors (no ESR tuning required) |
| Fast transient response | Minimizes output voltage deviation during 100mA→500mA load steps (≤±10mV with 4.7µF MLCC) |
| Low-noise regulation | 60–80 dB ripple rejection enables clean supply for noise-sensitive analog/RF circuits |
| Integrated protection | Current limiting + thermal shutdown prevent failure under fault conditions without external components |
Applications
| Automotive Infotainment Power | Industrial PLC I/O Module |
|---|---|
|
Use Scenario: Providing 3.3V rail for microcontroller, CAN transceiver, and display interface in head-unit control board. IC Role / Device Role / Timing Role: Primary post-regulator converting 5V/12V vehicle bus to noise-immune 3.3V logic supply. Use Value: AEC-Q100 qualification ensures reliability across thermal cycling; 1.2V dropout allows operation during cold-crank (6.5V min battery). |
Use Scenario: Supplying isolated 3.3V logic for digital input/output expansion cards in modular PLC chassis. IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling field-side digital isolators and FPGA configuration banks. Use Value: Stability with MLCCs reduces board area vs. tantalum; thermal shutdown protects against sustained overcurrent in harsh environments. |
| Medical Sensor Hub | Network Edge Router Interface |
|
Use Scenario: Powering low-power ADCs, temperature sensors, and BLE SoC in portable diagnostic device. IC Role / Device Role / Timing Role: Low-noise, low-quiescent-current LDO supplying precision analog front-end and wireless subsystem. Use Value: 60–80 dB ripple rejection preserves signal integrity; 4–10 mA IQ extends battery life in always-on monitoring mode. |
Use Scenario: Generating 3.3V for SFP+ module control logic and PHY interface in enterprise switch line card. IC Role / Device Role / Timing Role: Secondary regulator cleaning noisy 5V DC/DC output before feeding high-speed serial interface ICs. Use Value: Fast transient response maintains voltage within ±3% during bursty Ethernet traffic; TO252 thermal performance sustains 1A load at 70°C ambient. |
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 |
|---|---|---|---|
| AZ1117I-3.3TRG1 | 1A rating, ±2% tolerance, but only rated to +125°C junction (no AEC-Q100); higher 1.3V dropout at 1A | Lacks automotive qualification; less suitable for under-hood or infotainment use | Select when cost is primary constraint and automotive qualification is unnecessary |
| TLV1117-33CDCYR | 1A rating, ±1% tolerance, but requires minimum 10µF tantalum output capacitor; not MLCC-optimized | Higher ESR capacitor requirement increases size/cost; no AEC-Q100 Grade 2 | Select when tighter initial accuracy (±1%) outweighs MLCC flexibility and automotive compliance |
Compared with AZ1117I-3.3TRG1 and TLV1117-33CDCYR, ZLDO1117K33TC uniquely combines AEC-Q100 Grade 2, MLCC compatibility, and 1.2V dropout - making it the only choice for space-constrained, thermally demanding automotive and industrial designs requiring robust, low-ESR capacitor support.
Availability
ZLDO1117K33TC is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and medical sensor hubs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZLDO1117K33TC 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 company specializing in discrete, analog, and mixed-signal devices for power management, signal integrity, and connectivity applications.
ZLDO1117K33TC belongs to the ZLDO1117 family of high-reliability LDO regulators designed specifically for automotive and industrial applications demanding extended temperature operation, AEC-Q100 compliance, and MLCC-based compact power solutions.
FAQ
Is ZLDO1117K33TC pin-compatible with standard LM1117-3.3 or AP1117-3.3 regulators?
Yes - ZLDO1117K33TC uses identical TO252-3L pinout (VIN–GND–VOUT) and is functionally pin-compatible with industry-standard 1117-family fixed-output regulators. No PCB redesign is needed for drop-in replacement, though its lower dropout (1.2V vs. typical 1.3V) and AEC-Q100 qualification provide design margin.
What is the minimum recommended output capacitance, and why is ESR important?
The minimum output capacitance is 4.7µF X7R MLCC with ESR between 0.05Ω and 0.5Ω. ESR affects loop stability: too low (<0.05Ω) risks oscillation; too high (>0.5Ω) degrades transient response. The ZLDO1117K33TC's internal compensation is optimized for this range, enabling reliable operation without external compensation networks.
Can ZLDO1117K33TC operate with an input voltage below 4.7V?
It can operate in dropout mode down to VIN = VOUT + 1.3V (i.e., ≥4.6V), but regulation is not guaranteed below that threshold. For stable 3.3V output, VIN must be ≥4.7V per recommended operating conditions - ensuring sufficient headroom for line/load regulation and thermal margin across temperature.
Does ZLDO1117K33TC require an input capacitor?
An input capacitor is recommended (≥1µF ceramic) if the regulator is located >2 inches from the main bulk capacitor, to suppress high-frequency noise and limit peak input current during load transients. While not mandatory for basic functionality, it improves system-level EMI performance and prevents VIN sag that could trigger dropout or instability.
ZLDO1117K33TC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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:
- TO-252-3
ZLDO1117K33TC FAQ
1.How can I place an order for ZLDO1117K33TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117K33TC 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 ZLDO1117K33TC reliable?
The price and inventory of ZLDO1117K33TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117K33TC is usually 5 days.
3.What payment methods are accepted for ZLDO1117K33TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117K33TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117K33TC?
ZLDO1117K33TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117K33TC 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 ZLDO1117K33TC?
For technical support, including ZLDO1117K33TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117K33TC requirements.
6.How does Aetrix verify that ZLDO1117K33TC is sourced from the original manufacturer or authorized distributors?
All ZLDO1117K33TC 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 ZLDO1117K33TC meets industry standards.
7.What is the process for return or replacement of ZLDO1117K33TC?
All ZLDO1117K33TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117K33TC, 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 ZLDO1117K33TC part is unused and in its original packaging.
Return procedure for ZLDO1117K33TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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