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Diodes Incorporated ZLDO1117QK18TC
- Part No.:
- ZLDO1117QK18TC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ZLDO1117QK18TC.pdf
- Description:
- LDO BJT HICURR TO252 T&R 2.5K
- Quantity:
- Payment:
- Shipping:
Inventory:2,121
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Product details
Overview
ZLDO1117QK18TC from Diodes Incorporated is an automotive-grade, fixed-output 1.8V low-dropout linear regulator delivering up to 1A output current with ±2% output voltage tolerance over -40°C to +105°C ambient temperature, 1.2V maximum dropout at full load, and compatibility with MLCC output capacitors (≥4.7µF, ESR ≤0.5Ω). It is qualified to AEC-Q100 Grade 2 and used in 1.8V core regulation for automotive I/O interfaces.
For engineers reviewing the ZLDO1117QK18TC datasheet, ZLDO1117QK18TC pinout, ZLDO1117QK18TC application, or ZLDO1117QK18TC equivalent, key selection criteria include dropout voltage at 1A, thermal performance in TO252 (θJA = 73°C/W), AEC-Q100 qualification status, MLCC stability support, and fixed 1.8V output accuracy across industrial and automotive temperature ranges.
Technical Context
The ZLDO1117QK18TC implements a quasi-LDO architecture with internal 1.25V reference and feedback network optimized for fixed 1.8V output. Its thermal shutdown activates at +150°C junction temperature, and it features built-in current limiting with 1.1–1.2V dropout at 1A load under ΔVOUT = 1% specification.
It operates across input voltages from 3.2V to 18V (minimum VIN = VOUT + 1.5V for regulation), supports fast transient response with 4.7µF MLCC output capacitance, and achieves ≥60dB ripple rejection at 120Hz with proper capacitor selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.800V ±2% (1.764–1.836V) across -40°C to +105°C ambient |
| Max Dropout Voltage | 1.2V at 1A load (ensures regulation down to VIN = 3.0V) |
| Output Current | 1A continuous (current-limited; minimum load current = 2mA) |
| Input Voltage Range | 3.2V to 18V (VIN must exceed VOUT by ≥1.5V for stable regulation) |
| Thermal Resistance | θJA = 73°C/W (TO252 package on 1oz copper, 2cm×2cm pad, no airflow) |
| Quiescent Current | 4–10mA (enables low-power standby operation without disabling) |
| Ripple Rejection | ≥60dB at 120Hz (with 25µF tantalum output cap; degrades ~12dB for 5V outputs) |
| ESR Range (COUT) | 0.05Ω to 0.5Ω (validated for MLCC, tantalum, and aluminum electrolytic) |
Pinout & Package
Package: TO252-3 (DPAK), surface-mount, thermally enhanced with exposed tab connected to VOUT. RoHS-compliant, halogen- and antimony-free "Green" molding compound.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADJ/GND) | Reference/ground node | Ground connection for fixed-output variant; sets output voltage via resistor divider in adjustable mode |
| 2 (VOUT) | Regulated output | 1.8V output requiring ≥4.7µF MLCC (ESR ≤0.5Ω); tab is electrically connected to this pin |
| 3 (VIN) | Unregulated input | Accepts 3.2–18V; must remain ≥1.5V above VOUT to avoid dropout; requires local bulk capacitance |
| Tab | Thermal & electrical node | Internally tied to VOUT; serves as primary heat path to PCB copper; must be soldered to thermal pad |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualification | Validated for automotive use across -40°C to +105°C ambient with PPAP support |
| MLCC-compatible stability | Stable with ≥4.7µF X7R ceramic capacitors (ESR 0.05–0.5Ω), eliminating need for tantalum |
| Fast transient response | ≤10mV undershoot/overshoot during 100mA→500mA load steps with 4.7µF MLCC |
| Integrated protection | Current limiting + thermal shutdown (trip at +150°C junction, auto-recovery) |
| Low-noise regulation | 0.5% temperature stability and <0.2% line/load regulation minimizes supply-induced jitter |
Applications
| Automotive Body Control Module (BCM) | Infotainment Power Rail |
|---|---|
Use Scenario: Supplies 1.8V core power to microcontrollers and CAN transceivers in door modules and lighting controllers. IC Role / Device Role / Timing Role: Primary LDO providing clean, stable 1.8V rail with AEC-Q100 compliance and thermal robustness. Use Value: Enables reliable operation at 105°C ambient while maintaining ±2% output accuracy and supporting rapid load transients from MCU sleep/wake cycles. | Use Scenario: Powers 1.8V I/O banks of application processors and display interface ICs in head units. IC Role / Device Role / Timing Role: Fixed-output LDO decoupling high-speed digital logic from noisy DC/DC converters. Use Value: Delivers low-noise 1.8V with ≥60dB ripple rejection at 120Hz, reducing bit errors in LVDS and MIPI signaling paths. |
| Industrial Sensor Node | Automotive ADAS Camera Module |
Use Scenario: Regulates 1.8V for ultra-low-power sensor signal conditioning ASICs in battery-operated field devices. IC Role / Device Role / Timing Role: Low-quiescent-current (4–10mA) LDO enabling extended battery life without sacrificing regulation accuracy. Use Value: Maintains 1.8V ±2% over full -40°C to +105°C range while drawing minimal idle current-critical for energy-constrained deployments. | Use Scenario: Provides 1.8V core supply to image signal processors (ISPs) and high-speed serializers in rear-view and surround-view cameras. IC Role / Device Role / Timing Role: Thermally robust LDO with fast transient response supporting burst-mode ISP operation. Use Value: Sustains stable 1.8V during 500mA load steps with <10mV deviation, preventing frame corruption or reset events in real-time video pipelines. |
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 |
|---|---|---|---|
| TLV1117-18CDCYR | Commercial-grade (non-AEC-Q100), 1.2V dropout at 1A, θJA = 90°C/W (SOT-223), ±2% tolerance | Lacks automotive qualification, lower thermal performance, limited to industrial temp range (-40°C to +125°C junction) | Select only for non-automotive designs where AEC-Q100 and 105°C ambient operation are not required |
| NCP1117ST18T3G | AEC-Q100 Grade 3 (−40°C to +85°C ambient), 1.2V dropout, θJA = 80°C/W (SOT-223), ±2% tolerance | Lower ambient temperature rating; unsuitable for under-hood or high-ambient zones requiring +105°C operation | Acceptable for cabin-mounted modules but not for engine bay or powertrain applications |
Compared with TLV1117-18CDCYR and NCP1117ST18T3G, the ZLDO1117QK18TC provides superior automotive readiness via AEC-Q100 Grade 2 qualification, higher ambient temperature capability (+105°C), and lower thermal resistance (73°C/W) in TO252-making it the only option validated for demanding under-hood power rail applications.
Availability
ZLDO1117QK18TC is available at Aetrix Electronics and suitable for automotive body control modules, infotainment systems, industrial sensor nodes, and ADAS camera modules requiring stable component supply with full AEC-Q100 traceability and PPAP support.
Supply support for ZLDO1117QK18TC 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 manufacturer of discrete semiconductors and analog ICs, specializing in high-reliability power management, signal integrity, and protection solutions for automotive, industrial, and computing markets.
The ZLDO1117Q series belongs to Diodes' automotive-qualified LDO portfolio, designed specifically to replace legacy 1117 regulators in safety-critical and high-temperature environments with tighter tolerance, improved thermal performance, and MLCC compatibility.
FAQ
What is the minimum input voltage required for regulation at 1.8V output?
The ZLDO1117QK18TC requires VIN ≥ VOUT + 1.5V = 3.3V to maintain regulation under all conditions. At 1A load, dropout is guaranteed ≤1.2V, so regulation continues down to VIN = 3.0V-but 3.3V is the recommended minimum per datasheet operating conditions to ensure stability across temperature and line variation.
Can the ZLDO1117QK18TC be used with 2.2µF MLCC output capacitors?
No. The device requires a minimum 4.7µF output capacitor with ESR between 0.05Ω and 0.5Ω for guaranteed stability. Using 2.2µF violates the datasheet-specified 4.7µF minimum and risks oscillation or poor transient response, especially with low-ESR MLCCs. Valid alternatives include 4.7µF X7R ceramic, 4.7µF tantalum, or 47µF aluminum electrolytic.
Is the exposed tab electrically isolated or connected internally?
The exposed tab on the TO252 package is internally connected to the VOUT pin-not to ground or VIN. This is confirmed in the Pin Assignments section (top view diagram) and Pin Descriptions table. Proper PCB layout requires soldering the tab to a VOUT-connected copper pour for both thermal conduction and electrical continuity.
Does the ZLDO1117QK18TC support reverse-voltage or reverse-current protection?
No. The ZLDO1117QK18TC does not integrate reverse-voltage or reverse-current protection. If the input is shorted to ground while VOUT remains biased (e.g., by backfeed from downstream circuitry), the device may be damaged. Diodes Incorporated recommends adding an external series diode at VIN for reverse-polarity protection in automotive environments where battery terminal reversal is possible.
ZLDO1117QK18TC 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):
- 1.8V
- 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)
ZLDO1117QK18TC FAQ
1.How can I place an order for ZLDO1117QK18TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117QK18TC 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 ZLDO1117QK18TC reliable?
The price and inventory of ZLDO1117QK18TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117QK18TC is usually 5 days.
3.What payment methods are accepted for ZLDO1117QK18TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117QK18TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117QK18TC?
ZLDO1117QK18TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117QK18TC 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 ZLDO1117QK18TC?
For technical support, including ZLDO1117QK18TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117QK18TC requirements.
6.How does Aetrix verify that ZLDO1117QK18TC is sourced from the original manufacturer or authorized distributors?
All ZLDO1117QK18TC 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 ZLDO1117QK18TC meets industry standards.
7.What is the process for return or replacement of ZLDO1117QK18TC?
All ZLDO1117QK18TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117QK18TC, 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 ZLDO1117QK18TC part is unused and in its original packaging.
Return procedure for ZLDO1117QK18TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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