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Diodes Incorporated ZLDO1117KTC
- Part No.:
- ZLDO1117KTC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ZLDO1117KTC.pdf
- Description:
- IC REG LINEAR POS ADJ 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,100
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Product details
Overview
ZLDO1117KTC from Diodes Incorporated is an adjustable-output, 1A low-dropout linear regulator in TO252 package, delivering stable 1.2V–5.0V outputs with ≤1.2V dropout at full load, ±2% output tolerance over industrial temperature (−40°C to +125°C), and compatibility with MLCC output capacitors down to 4.7µF. It serves as a primary voltage regulator for FPGA I/O banks, microcontroller core supplies, and automotive infotainment power rails.
For engineers reviewing the ZLDO1117KTC datasheet, ZLDO1117KTC pinout, ZLDO1117KTC application, or ZLDO1117KTC equivalent, key selection criteria include dropout voltage at 1A, thermal resistance (θJA = 73°C/W), adjust-pin current (55µA typical), and AEC-Q100 Grade 2 qualification for automotive use.
Technical Context
The ZLDO1117KTC uses an internal 1.25V bandgap reference and error amplifier to regulate output via external resistor divider on the ADJ pin. Its quasi-LDO architecture achieves 1.11V typical dropout at 1A while maintaining stability with ceramic capacitors (ESR ≤ 0.5Ω).
Thermal shutdown activates at +150°C junction temperature, and current limiting protects against short-circuit faults. Ripple rejection reaches 80dB at 120Hz with proper capacitor selection and optional ADJ pin bypassing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Current | 1A continuous - supports high-current logic rails and FPGA I/O banks without derating at moderate ambient temperatures. |
| Dropout Voltage | 1.11V typ @ 1A - enables regulation from 18V input down to 1.25V output, critical for wide-input industrial systems. |
| Output Tolerance | ±2% over line/load/temp - ensures reliable operation of 3.3V/2.5V/1.8V digital interfaces without post-regulation trimming. |
| Quiescent Current | 4–10mA - balances low-noise performance with standby power efficiency in always-on subsystems. |
| Ripple Rejection | 80dB @ 120Hz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog or RF circuitry. |
| Thermal Resistance θJA | 73°C/W (TO252) - requires ≥2cm² copper pour for full 1A operation at +85°C ambient without thermal throttling. |
| Adjust Pin Current | 55µA typ - allows high-impedance feedback networks (e.g., 100kΩ/330kΩ) minimizing load regulation error. |
Pinout & Package
Package: TO252-3L (DPAK), surface-mount, thermally enhanced with exposed tab connected to VOUT for PCB heat spreading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Reference node for output voltage setting | Connects to resistor divider midpoint; grounded for fixed-output variants; 55µA bias current flows here. |
| 2 (VOUT) | Regulated output terminal | Tab-connected pin; must be decoupled with ≥4.7µF MLCC (ESR ≤ 0.5Ω) placed within 3mm of pin for stability. |
| 3 (VIN) | Unregulated input supply | Requires ≥1.3V headroom above VOUT; input capacitor recommended if >5cm from bulk supply to limit transient sag. |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualified | Validated for automotive cabin modules (−40°C to +105°C ambient) with PPAP documentation support. |
| MLCC-compatible stability | Stable with 4.7µF X7R ceramic (not Y5V); eliminates need for bulky tantalum or electrolytic capacitors. |
| Fast transient response | ≤10mV undershoot/overshoot for 100mA→500mA load steps with 4.7µF MLCC output capacitor. |
| Integrated protection | Current limiting + thermal shutdown prevent damage during sustained overload or poor heatsinking. |
| Low-noise operation | 60–80dB ripple rejection across 10Hz–100kHz enables clean power for ADC references and PLLs. |
Applications
| Automotive Infotainment Power | FPGA I/O Bank Regulation |
|---|---|
|
Use Scenario: Powering USB PHY, display interface, and audio codec in vehicle head units. IC Role / Device Role / Timing Role: Primary 3.3V/2.5V LDO supplying noise-sensitive mixed-signal ICs. Use Value: 80dB ripple rejection prevents switching noise from DC/DC converters from corrupting high-speed data links. |
Use Scenario: Providing configurable 1.2V–3.3V supply to FPGA I/O banks supporting multiple interface standards. IC Role / Device Role / Timing Role: Adjustable LDO enabling single-BOM flexibility across different board revisions and interface voltages. Use Value: ±2% tolerance and fast transient response ensure setup/hold timing margins are maintained during I/O toggling. |
| Industrial PLC Digital I/O | Medical Sensor Signal Chain |
|
Use Scenario: Regulating 5.0V/3.3V for isolated digital input/output modules operating in harsh factory environments. IC Role / Device Role / Timing Role: Robust front-end regulator handling wide input transients (up to 18V) and ESD events. Use Value: Built-in thermal shutdown and current limiting eliminate need for external fault management circuitry. |
Use Scenario: Supplying ultra-low-noise 1.8V/2.5V to precision ADCs, op-amps, and MEMS sensor interfaces. IC Role / Device Role / Timing Role: Low-ripple, low-drift LDO replacing higher-cost ultra-low-noise regulators where 80dB rejection suffices. Use Value: 0.1%/W thermal regulation minimizes offset drift in analog signal paths during ambient temperature cycling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar adjustable LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TLV1117-ADJ | Higher dropout (1.3V @ 1A), wider quiescent current range (5–15mA), no AEC-Q100 qualification. | Limited to commercial-grade industrial equipment; not suitable for automotive under-hood or cabin modules. | Select when cost is primary constraint and AEC-Q100 compliance is unnecessary. |
| LD1117S50TR | Fixed 5.0V output only; 1.2V dropout @ 1A; no adjustable version; RoHS-compliant but not halogen-free. | Only usable where output voltage is fixed and system-level flexibility is not required. | Choose only for legacy 5V-only designs where redesign to adjustable topology is impractical. |
Compared with TLV1117-ADJ and LD1117S50TR, the ZLDO1117KTC provides superior thermal robustness (−40°C to +125°C TJ), tighter output tolerance (±2% vs ±3%), and halogen-free "Green" packaging-making it optimal for next-generation automotive and industrial designs requiring long-term reliability and regulatory compliance.
Availability
ZLDO1117KTC is available at Aetrix Electronics and suitable for automotive infotainment systems, industrial PLC I/O modules, and medical sensor signal chains requiring stable component supply across extended temperature ranges and long product lifecycles.
Supply support for ZLDO1117KTC 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 design centers in Asia, Europe, and the US, serving automotive, industrial, and consumer markets.
The ZLDO1117 series belongs to Diodes' high-reliability LDO portfolio, engineered specifically for automotive-grade power management and industrial applications demanding AEC-Q100 qualification, wide temperature operation, and MLCC compatibility.
FAQ
What is the minimum output capacitor required for stability with ZLDO1117KTC?
A minimum 4.7µF X7R MLCC capacitor with ESR between 0.05Ω and 0.5Ω is required for stability. Tantalum (4.7µF) or aluminum electrolytic (47µF) are acceptable alternatives. Y5V dielectrics must be avoided due to capacitance loss at bias and temperature extremes.
Can ZLDO1117KTC be used in automotive applications?
Yes - ZLDO1117KTC is AEC-Q100 Grade 2 qualified (−40°C to +105°C ambient, −40°C to +125°C junction), PPAP-capable, and manufactured in a halogen- and antimony-free "Green" process, making it suitable for automotive infotainment, body control, and ADAS subsystems.
How does the adjust pin current affect output accuracy?
The ADJ pin draws 55µA typical, which flows through the lower feedback resistor (R2). For a 1.25V reference and 5V output using R1=110Ω/R2=330Ω, this introduces ~0.4% error. Accuracy improves with lower R2 values or by compensating R2 downward per datasheet Equation 2.
What is the maximum input voltage for ZLDO1117KTC?
The absolute maximum input voltage is +18V relative to ground. Operation above 12V reduces safe operating area margin; for 1A loads at VIN > 12V, thermal design must ensure junction temperature remains ≤ +125°C using the specified θJA = 73°C/W and appropriate PCB copper area.
ZLDO1117KTC 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:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 16.65V
- 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
ZLDO1117KTC FAQ
1.How can I place an order for ZLDO1117KTC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117KTC 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 ZLDO1117KTC reliable?
The price and inventory of ZLDO1117KTC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117KTC is usually 5 days.
3.What payment methods are accepted for ZLDO1117KTC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117KTC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117KTC?
ZLDO1117KTC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117KTC 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 ZLDO1117KTC?
For technical support, including ZLDO1117KTC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117KTC requirements.
6.How does Aetrix verify that ZLDO1117KTC is sourced from the original manufacturer or authorized distributors?
All ZLDO1117KTC 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 ZLDO1117KTC meets industry standards.
7.What is the process for return or replacement of ZLDO1117KTC?
All ZLDO1117KTC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117KTC, 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 ZLDO1117KTC part is unused and in its original packaging.
Return procedure for ZLDO1117KTC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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