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Diodes Incorporated ZLDO1117QK12TC
- Part No.:
- ZLDO1117QK12TC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ZLDO1117QK12TC.pdf
- Description:
- LDO BJT HICURR TO252 T&R 2.5K
- Quantity:
- Payment:
- Shipping:
Inventory:2,167
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Product details
Overview
ZLDO1117QK12TC from Diodes Incorporated is an automotive-grade, fixed-output 1.2V low-dropout linear regulator with 1A output current capability, 2% output voltage tolerance over temperature/load/line, ≤1.2V dropout at full load, and AEC-Q100 Grade 2 qualification for use in engine control units and ADAS power rails.
For engineers reviewing the ZLDO1117QK12TC datasheet, ZLDO1117QK12TC pinout, ZLDO1117QK12TC application, or ZLDO1117QK12TC equivalent, this part supports stable 1.2V core supply generation in high-reliability automotive systems where thermal shutdown, fast transient response, and MLCC compatibility are critical design requirements.
Technical Context
The ZLDO1117QK12TC implements a quasi-LDO architecture with internal 1.25V reference and feedback network optimized for fixed 1.2V output, delivering 1A continuous current while maintaining regulation down to 1.2V input-to-output differential. It features built-in current limiting and thermal shutdown triggered at +150°C junction temperature.
Its stability is guaranteed with ≥4.7µF MLCC output capacitors (ESR ≤ 0.5Ω), enabling compact, low-ESR power delivery in space-constrained automotive modules. The device operates across −40°C to +105°C ambient, with junction temperature rated up to +125°C under continuous load.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.200 V ±2% (−40°C to +105°C ambient), ensuring precise core logic rail compliance for automotive microcontrollers. |
| Dropout Voltage | ≤1.2 V at 1A load (ΔVOUT = 1% of VOUT), enabling operation from 2.4V input in battery-sag conditions. |
| Output Current | 1 A continuous, supporting single-core MCU or FPGA I/O bank power without external pass devices. |
| Line Regulation | ≤0.2% over VIN = 2.7V–12V, minimizing output variation during vehicle battery transients. |
| Load Regulation | ≤0.4% over 10mA–1A load, maintaining tight voltage control during processor wake/sleep transitions. |
| Ripple Rejection | ≥60 dB at 120 Hz (with 25µF tantalum), suppressing alternator ripple in 12V system-derived supplies. |
| Quiescent Current | 4–10 mA (−40°C to +105°C), reducing standby power loss in always-on automotive domains. |
| Thermal Shutdown | Activates at TJ ≈ +150°C, protecting against sustained overload or poor PCB heatsinking. |
Pinout & Package
Package: TO252 (DPAK) surface-mount package with exposed tab electrically connected to VOUT for enhanced thermal conduction and PCB heat spreading.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (ADJ/GND) | Ground reference terminal | Internal connection to GND for fixed-output variants; must be tied to ground for proper regulation and thermal shutdown reference. |
| 2 (VOUT) | Regulated output node | Delivers 1.2V output; tab is internally bonded to this pin-requires minimum 4.7µF MLCC (ESR ≤ 0.5Ω) to ground for stability. |
| 3 (VIN) | Unregulated input supply | Accepts 2.7V–18V input; must remain ≥1.3V above VOUT to maintain regulation; requires local bulk capacitance near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Automotive qualification | AEC-Q100 Grade 2 qualified (−40°C to +105°C ambient), PPAP-capable, manufactured in IATF16949 facilities. |
| MLCC-compatible stability | Stable with ≥4.7µF X7R ceramic capacitors (ESR ≤ 0.5Ω), eliminating need for bulky tantalum or electrolytic caps. |
| Fast transient response | Sub-10mV load-step deviation with 4.7µF MLCC output, critical for burst-mode MCU core switching. |
| Low-noise regulation | 60–80 dB ripple rejection (120Hz–10kHz), suppressing conducted noise from switching pre-regulators in multi-rail systems. |
| Thermal protection | Auto-recovering shutdown at ~+150°C junction temperature, preventing permanent damage during thermal overload events. |
Applications
| Engine Control Unit (ECU) Core Supply | Advanced Driver Assistance Systems (ADAS) Sensor Hub |
|---|---|
|
Use Scenario: Powering 1.2V core rail of automotive-grade ARM Cortex-M7 microcontroller in engine management system. IC Role / Device Role / Timing Role: Primary LDO regulator providing clean, stable core voltage with fast load transient recovery during ignition pulse events. Use Value: Maintains <±2% output accuracy across −40°C to +105°C ambient and withstands 12V battery sag to 6V without dropout, ensuring deterministic MCU operation. |
Use Scenario: Supplying 1.2V core for radar SoC and image signal processor in front-camera module. IC Role / Device Role / Timing Role: Low-noise, AEC-Q100-compliant voltage source for high-speed digital logic requiring minimal jitter coupling. Use Value: Delivers 60+ dB ripple rejection at 120Hz alternator frequency, reducing timing uncertainty in ADC sampling and SERDES links. |
| Infotainment System Memory Interface | Body Control Module (BCM) Microcontroller Core |
|
Use Scenario: Generating 1.2V supply for LPDDR4 memory controller in head-unit application processor. IC Role / Device Role / Timing Role: High-current LDO placed adjacent to memory IC to minimize IR drop and inductance in power path. Use Value: Supports 1A peak current with ≤0.4% load regulation, preserving signal integrity on memory DQ/DQS lines during burst reads/writes. |
Use Scenario: Providing regulated 1.2V core for 32-bit automotive MCU in door module or lighting controller. IC Role / Device Role / Timing Role: Robust, thermally protected LDO replacing discrete solutions in cost-sensitive, space-constrained BCM PCBs. Use Value: Enables use of compact TO252 footprint with 73°C/W θJA (on 1oz copper), reducing heatsink area by >40% vs. SOT223 alternatives. |
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 |
|---|---|---|---|
| TLV73312PDBVR | Lower IQ (40 µA typical), lower max current (300 mA), no AEC-Q100 qualification, SOT-23-5 package. | Suitable only for non-automotive, low-power subsystems (e.g., infotainment accessories); lacks thermal robustness for under-hood use. | Select only if <300 mA load and commercial temperature range suffice; not acceptable for ECU/ADAS. |
| NCP1117ST12T3G | Same 1.2V fixed output, 1A rating, but AEC-Q100 Grade 3 (−40°C to +85°C ambient), higher dropout (1.3V typ), SOT-223 package. | Limited to cabin-zone applications due to narrower ambient range; larger θJA (107°C/W) reduces power handling on same PCB. | Acceptable for body electronics with relaxed thermal margins; inferior for under-hood or ADAS thermal profiles. |
Compared with TLV73312PDBVR and NCP1117ST12T3G, the ZLDO1117QK12TC uniquely combines AEC-Q100 Grade 2 qualification, 1A capability in TO252, and 1.2V dropout-enabling direct replacement in high-temperature, high-current automotive core rails where reliability and thermal headroom are non-negotiable.
Availability
ZLDO1117QK12TC is available at Aetrix Electronics and suitable for engine control units, ADAS sensor hubs, infotainment memory interfaces, and body control modules requiring stable component supply with automotive traceability and PPAP support.
Supply support for ZLDO1117QK12TC 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 components for automotive, industrial, and consumer markets, with ISO/TS 16949 and IATF16949 certified manufacturing.
The ZLDO1117Q series belongs to Diodes' automotive-qualified LDO portfolio, designed specifically to replace legacy 1117 regulators in safety-critical vehicle systems demanding extended temperature operation and AEC-Q100 compliance.
FAQ
What is the minimum input voltage required for regulation at 1.2V output?
The ZLDO1117QK12TC requires VIN ≥ 2.7V for guaranteed regulation, per datasheet Recommended Operating Conditions. To avoid dropout, VIN must exceed VOUT by at least 1.3V-so 2.5V is the absolute minimum, but 2.7V ensures margin across temperature and line variation. Below 2.7V, regulation degrades progressively.
Can this device be used with 10µF MLCC output capacitors?
Yes-the ZLDO1117QK12TC is explicitly characterized for stability with ≥4.7µF MLCC capacitors (X7R dielectric, ESR ≤ 0.5Ω). A 10µF MLCC meets and exceeds this requirement, improving transient response and loop phase margin versus the minimum value. Avoid Y5V dielectrics due to capacitance drift.
Is the exposed tab electrically isolated or connected to a pin?
The exposed tab on the TO252 (DPAK) package is electrically connected to Pin 2 (VOUT), as confirmed in the Pin Assignments section of DS37075 Rev. 3-2. This provides low-thermal-resistance path to PCB copper for heat dissipation and must be routed to the 1.2V output plane-not to ground or chassis.
Does this part support reverse-voltage protection?
No-the ZLDO1117QK12TC does not include reverse-voltage protection. If VIN may be shorted to ground or reversed, an external Schottky diode (anode to VIN, cathode to input capacitor) is recommended per Application Information Section 7.2 to prevent damage to the internal pass transistor and bandgap circuitry.
ZLDO1117QK12TC 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):
- 1.2V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 1.35V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 5 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)
ZLDO1117QK12TC FAQ
1.How can I place an order for ZLDO1117QK12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117QK12TC 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 ZLDO1117QK12TC reliable?
The price and inventory of ZLDO1117QK12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117QK12TC is usually 5 days.
3.What payment methods are accepted for ZLDO1117QK12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117QK12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117QK12TC?
ZLDO1117QK12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117QK12TC 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 ZLDO1117QK12TC?
For technical support, including ZLDO1117QK12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117QK12TC requirements.
6.How does Aetrix verify that ZLDO1117QK12TC is sourced from the original manufacturer or authorized distributors?
All ZLDO1117QK12TC 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 ZLDO1117QK12TC meets industry standards.
7.What is the process for return or replacement of ZLDO1117QK12TC?
All ZLDO1117QK12TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117QK12TC, 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 ZLDO1117QK12TC part is unused and in its original packaging.
Return procedure for ZLDO1117QK12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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