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Diodes Incorporated ZLDO1117K50TC
- Part No.:
- ZLDO1117K50TC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ZLDO1117K50TC.pdf
- Description:
- IC REG LINEAR 5V 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:4,234
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Product details
Overview
ZLDO1117K50TC from Diodes Incorporated is a fixed-output 5.0V, 1A low-dropout linear regulator in TO252 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. It delivers stable 5V power for logic supplies, bus termination, and embedded microcontroller I/O rails where input voltage may reach up to 18V.
For engineers reviewing the ZLDO1117K50TC datasheet, ZLDO1117K50TC pinout, ZLDO1117K50TC application, or ZLDO1117K50TC equivalent, key selection criteria include dropout performance at 1A, thermal shutdown behavior, ripple rejection (≥60dB at 120Hz), ESR-compatible capacitor requirements (0.05–0.5Ω), and AEC-Q100 Grade 2 qualification for automotive-adjacent designs.
Technical Context
The ZLDO1117K50TC uses an internal 1.25V bandgap reference and error amplifier to regulate output voltage with fast transient response and built-in current limiting. Its quiescent current remains stable at 4–10mA across input voltages up to 18V, and it incorporates thermal shutdown triggered at ~150°C junction temperature.
Unlike standard 1117 regulators, this device supports multi-layer ceramic capacitors (MLCC) down to 4.7µF with ESR ≤0.5Ω, eliminating need for high-ESR tantalum or electrolytic types. The TO252 package provides θJA = 73°C/W and θJC = 12°C/W under defined PCB conditions, enabling higher continuous current capability than SOT223 variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 5.0V ±2% (guaranteed across −40°C to +125°C, line/load) |
| Max Dropout Voltage | 1.2V at 1A load (enables regulation with VIN as low as 6.2V) |
| Output Current | 1A continuous (with thermal derating above ambient; SOA-limited) |
| Ripple Rejection | ≥60dB at 120Hz (reduces AC noise on 5V rail without external filtering) |
| Quiescent Current | 4–10mA (low no-load consumption preserves system efficiency) |
| Thermal Shutdown | Activates at ~150°C junction temperature (self-protects during overload or poor heatsinking) |
| Capacitor Compatibility | Stable with 4.7µF X7R MLCC (ESR 0.05–0.5Ω); avoids Y5V dielectrics |
Pinout & Package
Package: TO252-3L (DPAK), surface-mount, thermally enhanced with exposed tab connected to VOUT. Designed for 1 oz copper PCB pad (2cm × 2cm) achieving θJA = 73°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Ground reference (fixed-mode only) | Internally tied to GND; not adjustable - must be connected directly to system ground plane |
| 2 (VOUT) | Regulated output | Delivers 5.0V; requires ≥4.7µF MLCC (0.05–0.5Ω ESR) to ground for stability and transient response |
| 3 (VIN) | Input supply | Accepts 6.4–18V input; must remain ≥1.3V above VOUT to maintain regulation; decoupling capacitor recommended |
| Tab | Output connection | Electrically tied to Pin 2 (VOUT); serves as primary thermal path - must be soldered to large copper pour |
Key Features
| Feature | Design Value |
|---|---|
| AEC-Q100 Grade 2 qualified | Validated for automotive-adjacent applications including infotainment power rails and body control modules |
| MLCC-compatible stability | Eliminates need for bulky, aging-prone tantalum capacitors - reduces board area and improves long-term reliability |
| Fast transient response | Maintains <±10mV output deviation during 100mA→500mA load steps (with 4.7µF MLCC) |
| Low-noise operation | 60–80dB ripple rejection across 10Hz–100kHz enables clean 5V supply for ADC references and analog sensors |
| Green packaging | Halogen- and antimony-free, RoHS-compliant molding compound (<900ppm Br/Cl, <1000ppm Sb) |
Applications
| Industrial PLC I/O Module | Automotive Infotainment MCU Core |
|---|---|
Use Scenario: Powering isolated 5V digital I/O channels in programmable logic controllers with wide ambient temperature swings. IC Role / Device Role / Timing Role: Primary 5V LDO supplying FPGA configuration I/O banks and level-shifting buffers. Use Value: 1.2V dropout ensures regulation even during brown-out events on 12V backplane; ±2% tolerance maintains logic-level integrity across −40°C to +85°C operating range. | Use Scenario: Providing stable 5V rail to microcontroller peripherals (CAN transceivers, display drivers) in head-unit systems. IC Role / Device Role / Timing Role: Secondary regulated supply derived from 12V battery, decoupled from noisy switching DC/DC stages. Use Value: AEC-Q100 Grade 2 qualification and thermal shutdown ensure functional safety compliance; MLCC compatibility simplifies layout near EMI-sensitive RF sections. |
| Medical Sensor Signal Chain | Networking Equipment Management Controller |
Use Scenario: Generating ultra-low-noise 5V for precision analog front-ends (AFE) in portable diagnostic devices. IC Role / Device Role / Timing Role: Clean post-regulator for ADC reference and op-amp biasing, downstream of buck converter. Use Value: ≥60dB ripple rejection suppresses switching noise from upstream converters; low quiescent current extends battery life in portable units. | Use Scenario: Supplying 5V to baseboard management controller (BMC) and EEPROM in enterprise switches/routers. IC Role / Device Role / Timing Role: Always-on LDO maintaining firmware execution and watchdog timing during main CPU sleep cycles. Use Value: Guaranteed operation to +125°C junction temperature supports compact, fanless chassis designs; TO252 thermal performance sustains 1A load without derating. |
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 |
|---|---|---|---|
| TLV1117-50CDR | Higher dropout (1.3V typ at 1A), wider output tolerance (±3%), no AEC-Q100 qualification | Lacks automotive-grade reliability; lower ripple rejection (55dB) | Lower-cost option for non-automotive consumer applications where thermal margin is ample |
| AP1117K50G-13 | Same 1.2V dropout spec but only rated to +125°C ambient (not junction), no MLCC-specific validation | Not qualified to AEC-Q100; limited thermal data for TO252 mounting | Suitable for cost-sensitive industrial controls where extended junction temp rating is unnecessary |
Compared with TLV1117-50CDR and AP1117K50G-13, the ZLDO1117K50TC offers tighter output tolerance, guaranteed MLCC compatibility, and AEC-Q100 Grade 2 qualification - making it preferred for automotive-adjacent, high-reliability, or thermally constrained designs requiring robust 5V regulation at full 1A load.
Availability
ZLDO1117K50TC is available at Aetrix Electronics and suitable for industrial PLC I/O modules, automotive infotainment subsystems, medical sensor signal chains, and networking equipment management controllers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZLDO1117K50TC 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 industrial, automotive, and computing markets.
The ZLDO1117 series belongs to Diodes' precision LDO portfolio, engineered specifically for low-noise, high-stability regulation in space-constrained and thermally demanding applications - emphasizing MLCC compatibility, extended temperature operation, and automotive qualification.
FAQ
What is the minimum input voltage required for ZLDO1117K50TC to maintain regulation?
The device requires VIN ≥ VOUT + 1.3V (i.e., ≥6.3V) to guarantee regulation under all conditions. At 1A load, dropout is specified at 1.2V max, so 6.2V input sustains 5.0V output - but design margin recommends ≥6.5V minimum to accommodate line and load transients per datasheet Note 8.
Can ZLDO1117K50TC be used with ceramic capacitors smaller than 4.7µF?
No - the datasheet mandates ≥4.7µF MLCC (X7R) with ESR between 0.05Ω and 0.5Ω for loop stability. Smaller values risk oscillation or degraded transient response. Y5V dielectrics are explicitly prohibited due to capacitance drift with voltage/temperature.
Does ZLDO1117K50TC require an input capacitor?
An input capacitor is not strictly required for stability but is strongly recommended: a 1µF ceramic capacitor placed close to VIN and GND minimizes input impedance during load transients and prevents input voltage sag below dropout threshold, especially when the regulator is remote from bulk storage capacitance.
How does thermal shutdown behave during sustained overload?
When junction temperature reaches ~150°C, the regulator disables output and enters thermal shutdown. It remains off until die cools to ~135°C, then resumes regulation. This hiccup-mode cycling protects against permanent damage but causes output interruption - proper heatsinking or current limiting is essential for continuous operation.
ZLDO1117K50TC 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):
- 5V
- 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
ZLDO1117K50TC FAQ
1.How can I place an order for ZLDO1117K50TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117K50TC 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 ZLDO1117K50TC reliable?
The price and inventory of ZLDO1117K50TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117K50TC is usually 5 days.
3.What payment methods are accepted for ZLDO1117K50TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117K50TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117K50TC?
ZLDO1117K50TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117K50TC 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 ZLDO1117K50TC?
For technical support, including ZLDO1117K50TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117K50TC requirements.
6.How does Aetrix verify that ZLDO1117K50TC is sourced from the original manufacturer or authorized distributors?
All ZLDO1117K50TC 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 ZLDO1117K50TC meets industry standards.
7.What is the process for return or replacement of ZLDO1117K50TC?
All ZLDO1117K50TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117K50TC, 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 ZLDO1117K50TC part is unused and in its original packaging.
Return procedure for ZLDO1117K50TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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