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Diodes Incorporated ZLDO1117QK33TC
- Part No.:
- ZLDO1117QK33TC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ZLDO1117QK33TC.pdf
- Description:
- LDO BJT HICURR TO252 T&R 2.5K
- Quantity:
- Payment:
- Shipping:
Inventory:2,224
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Product details
Overview
ZLDO1117QK33TC from Diodes Incorporated is an AEC-Q100 Grade 2 qualified, fixed-output 3.3V low-dropout linear regulator delivering 1A output current with ≤1.2V dropout at full load, ±2% output voltage tolerance over -40°C to +105°C ambient, and stable operation with 4.7µF MLCC output capacitors. It serves as a primary power rail for automotive infotainment SoCs and ADAS sensor interfaces requiring clean, regulated 3.3V supply under wide-input (up to 18V) and transient conditions.
For engineers reviewing the ZLDO1117QK33TC datasheet, ZLDO1117QK33TC pinout, ZLDO1117QK33TC application, or ZLDO1117QK33TC equivalent, key selection criteria include dropout voltage at 1A load, thermal resistance in TO252 package, MLCC compatibility, AEC-Q100 qualification status, and quiescent current under no-load conditions.
Technical Context
The ZLDO1117QK33TC implements a quasi-LDO architecture with internal 1.25V reference and feedback loop optimized for stability with low-ESR ceramic capacitors (0.05Ω–0.5Ω). Its thermal shutdown activates at +150°C junction temperature, and current limiting protects against short-circuit faults without external components.
It operates across input voltages from 4.7V to 18V (minimum VIN = VOUT + 1.5V for regulation), supports fast transient response via internal compensation, and achieves 60–80dB ripple rejection at 120Hz with 25µF tantalum output capacitance - performance maintained across its full industrial and automotive temperature range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300V ±2% (3.235–3.365V) across -40°C to +105°C ambient, enabling precise logic rail generation without external resistors. |
| Max Dropout Voltage | 1.2V at 1A load (ΔVOUT = 1% of VOUT), allowing operation with only 4.5V input for stable 3.3V output - critical for 5V-to-3.3V conversion in automotive body control modules. |
| Output Current | 1A continuous, with internal current limiting and thermal shutdown, supporting high-current microcontrollers and interface ICs without external foldback circuitry. |
| Quiescent Current | 4–10mA at VIN < 18V and IO = 0mA, minimizing standby power loss in always-on vehicle subsystems like CAN gateways. |
| Ripple Rejection | 60–80dB at 120Hz (VIN = VOUT + 3V, COUT = 25µF tantalum), suppressing alternator ripple and switching converter noise before sensitive analog/RF circuits. |
| Thermal Resistance θJA | 73°C/W (TO252 on 2"×2" polyimide PCB, 1oz copper, 2cm×2cm pad), defining maximum power dissipation limits for thermal design in sealed enclosures. |
| ESR Range (COUT) | 0.05Ω to 0.5Ω required for stability - validated with 4.7µF X7R MLCCs, eliminating need for higher-ESR tantalum or electrolytic capacitors. |
Pinout & Package
Package: TO252 (DPAK), surface-mount, thermally enhanced with exposed tab connected to VOUT for improved heat transfer to PCB copper pour.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADJ/GND) | Reference node / ground return | Ground terminal for fixed-output variant; tied directly to system GND - no external resistor network required for 3.3V operation. |
| 2 (VOUT) | Regulated output | 3.3V power rail output; tab is electrically connected to this pin - must be soldered to large copper area for thermal management and low-impedance return path. |
| 3 (VIN) | Unregulated input | Accepts 4.7V–18V DC input; requires ≥1.5V headroom above VOUT to maintain regulation; minimum 1µF ceramic input capacitor recommended if not near bulk filter. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualification | Validated for -40°C to +105°C ambient operation with PPAP support - meets functional safety requirements for non-safety-critical automotive ECUs. |
| MLCC-compatible stability | Stable with 4.7µF X7R ceramic capacitors (ESR ≥0.05Ω), reducing board space and cost versus tantalum while improving reliability and lifetime. |
| Fast transient response | Sub-10mV load-step deviation (100mA→500mA) with 4.7µF MLCC output, maintaining voltage integrity during processor core wake-up events. |
| Integrated protection | Built-in thermal shutdown and current limiting eliminate need for external fault-handling circuitry - simplifies BOM and layout in space-constrained modules. |
| Low-noise regulation | 0.5% temperature stability and <0.2% load regulation ensure consistent 3.3V rail accuracy across battery voltage sag and temperature cycling. |
Applications
| Automotive Body Control Module (BCM) | ADAS Camera Power Supply |
|---|---|
|
Use Scenario: Regulating 12V battery-derived input to clean 3.3V for microcontroller, CAN transceiver, and LIN interface ICs in door module or lighting ECU. IC Role / Device Role / Timing Role: Primary 3.3V LDO supplying logic and communication peripherals with tight voltage tolerance and ripple rejection of alternator noise. Use Value: Enables reliable CAN/LIN communication under cold-crank (6.5V) and load-dump (27V) conditions due to 1.2V dropout and 18V absolute max input rating. |
Use Scenario: Providing stable 3.3V bias to image signal processor (ISP) and serializer ICs in rear-view or surround-view camera modules. IC Role / Device Role / Timing Role: Low-noise, thermally robust power source ensuring pixel clock stability and analog front-end accuracy across vehicle cabin temperature extremes. Use Value: Maintains <±2% output accuracy from -40°C to +105°C ambient and rejects >60dB of switching noise from adjacent DC/DC converters, preventing image artifacts. |
| Infotainment Head Unit Core Logic | Telematics Control Unit (TCU) I/O Rail |
|
Use Scenario: Delivering 3.3V to application processor I/O banks, USB PHY, and audio codec in automotive infotainment systems. IC Role / Device Role / Timing Role: Secondary LDO generating noise-sensitive I/O supply, decoupled from noisy main 5V/12V rails via low-dropout architecture. Use Value: Fast transient response (<10µs recovery) prevents I/O timing violations during burst data transfers, supported by MLCC-compatible 4.7µF output capacitance. |
Use Scenario: Powering cellular modem baseband, GNSS receiver, and eSIM interface in vehicle telematics units operating continuously in parked mode. IC Role / Device Role / Timing Role: Always-on 3.3V regulator with 4–10mA quiescent current, sustaining modem sleep states while enabling rapid network reconnection. Use Value: Low IQ minimizes battery drain during 14-day parking cycles; AEC-Q100 qualification ensures field reliability over 15-year vehicle lifespan. |
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 |
|---|---|---|---|
| TLV1117-33CDCR (TI) | Commercial-grade (not AEC-Q100 qualified); 1.2V dropout at 800mA; 1% initial tolerance; θJA = 120°C/W (SOT-223). | Limited to non-automotive industrial or consumer use; insufficient thermal margin for sustained 1A loads in sealed enclosures. | Select only for cost-sensitive non-automotive designs where AEC-Q100 and 1A continuous rating are not required. |
| NCP1117ST33T3G (onsemi) | AEC-Q100 Grade 3 (–40°C to +85°C ambient); 1.2V dropout at 1A; 2% tolerance; θJA = 90°C/W (SOT-223), no TO252 option. | Not rated for full automotive ambient range; lower thermal performance restricts 1A operation in high-ambient environments. | Use only where ambient temperature remains below +85°C and PCB layout cannot accommodate TO252 thermal pad requirements. |
Compared with TLV1117-33CDCR and NCP1117ST33T3G, the ZLDO1117QK33TC uniquely delivers AEC-Q100 Grade 2 qualification, TO252 thermal performance (73°C/W), and guaranteed 1A operation across –40°C to +105°C - making it the only drop-in solution for thermally demanding automotive 3.3V rail applications.
Availability
ZLDO1117QK33TC is available at Aetrix Electronics and suitable for automotive body control modules, ADAS camera systems, infotainment head units, and telematics control units requiring stable component supply with full AEC-Q100 documentation and long-term lifecycle support.
Supply support for ZLDO1117QK33TC 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 devices, with ISO/TS 16949-certified automotive production facilities and broad portfolio of AEC-Q100-qualified components.
The ZLDO1117Q series belongs to Diodes' automotive-grade LDO regulator product line, engineered specifically for power integrity in harsh-temperature automotive subsystems - emphasizing low dropout, MLCC compatibility, and PPAP-ready qualification.
FAQ
Is ZLDO1117QK33TC pin-compatible with standard LM1117-3.3 regulators?
Yes - it uses identical TO252 (DPAK) pinout (Pin 1 = GND, Pin 2 = VOUT, Pin 3 = VIN) and matches LM1117-3.3 electrical behavior, but adds AEC-Q100 Grade 2 qualification, tighter 2% tolerance, and guaranteed MLCC stability with 4.7µF X7R capacitors - enabling direct replacement in automotive upgrades.
What is the minimum input voltage required for regulation at 1A load?
The minimum input voltage is 4.7V: VOUT (3.3V) + 1.5V headroom (per datasheet Note 5). Below this, the device enters dropout mode - still functional but unregulated. At exactly 4.7V input, output remains 3.3V ±2% with ≤1.2V dropout confirmed across temperature and load.
Can ZLDO1117QK33TC operate without an input capacitor?
An input capacitor is strongly recommended: 1µF ceramic placed close to VIN and GND pins suppresses high-frequency noise and prevents instability during load transients. While not strictly mandatory for basic regulation, omission risks oscillation when upstream source impedance exceeds 0.1Ω - especially with long PCB traces from bulk capacitors.
Does the exposed tab require electrical isolation from the PCB ground plane?
No - the tab is internally connected to Pin 2 (VOUT), not GND. It must be soldered to a dedicated 3.3V copper pour or thermal pad, electrically isolated from other nets. Connecting it to GND creates a short circuit; connecting it to VIN risks overvoltage damage. Thermal vias to inner-layer copper pours are recommended for heat dissipation.
ZLDO1117QK33TC 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:
- 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):
- 1.35V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 80dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 125°C (TJ)
- Grade:
- Automotive
- Qualification:
- AEC-Q100
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- TO-252 (DPAK)
ZLDO1117QK33TC FAQ
1.How can I place an order for ZLDO1117QK33TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117QK33TC 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 ZLDO1117QK33TC reliable?
The price and inventory of ZLDO1117QK33TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117QK33TC is usually 5 days.
3.What payment methods are accepted for ZLDO1117QK33TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117QK33TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117QK33TC?
ZLDO1117QK33TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117QK33TC 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 ZLDO1117QK33TC?
For technical support, including ZLDO1117QK33TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117QK33TC requirements.
6.How does Aetrix verify that ZLDO1117QK33TC is sourced from the original manufacturer or authorized distributors?
All ZLDO1117QK33TC 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 ZLDO1117QK33TC meets industry standards.
7.What is the process for return or replacement of ZLDO1117QK33TC?
All ZLDO1117QK33TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117QK33TC, 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 ZLDO1117QK33TC part is unused and in its original packaging.
Return procedure for ZLDO1117QK33TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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