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Diodes Incorporated ZLDO1117K12TC
- Part No.:
- ZLDO1117K12TC
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
ZLDO1117K12TC.pdf
- Description:
- IC REG LINEAR 1.2V 1A TO252-3
- Quantity:
- Payment:
- Shipping:
Inventory:3,086
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Product details
Overview
ZLDO1117K12TC from Diodes Incorporated is a 1.2 V fixed-output, 1 A low dropout linear regulator in TO252 package, featuring 1.2 V maximum dropout at full load, ±2% output voltage tolerance over industrial temperature range (−40°C to +125°C), and guaranteed stability with 4.7 µF MLCC output capacitors. It delivers precise, low-noise 1.2 V supply for FPGA core rails, microcontroller I/O domains, and high-speed bus termination.
For engineers reviewing the ZLDO1117K12TC datasheet, ZLDO1117K12TC pinout, ZLDO1117K12TC application, or ZLDO1117K12TC equivalent, key selection criteria include dropout voltage under 1.2 V at 1 A, thermal shutdown activation at 150°C, compatibility with ceramic capacitors down to 0.05 Ω ESR, and AEC-Q100 Grade 2 qualification for automotive-adjacent industrial systems.
Technical Context
The ZLDO1117K12TC employs a bandgap-referenced error amplifier driving a PNP pass transistor, enabling stable regulation with minimal headroom. Its internal 1.25 V reference and trimmed resistor network fix output at 1.2 V with ±2% accuracy across line, load, and temperature.
Thermal protection activates at ~150°C junction temperature, cycling output off/on during overload; fast transient response is achieved via internal compensation optimized for 4.7 µF MLCCs (ESR 0.05–0.5 Ω). Ripple rejection reaches 80 dB at 120 Hz with proper capacitor selection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 1.200 V ±2% (1.176–1.224 V) - ensures reliable 1.2 V core supply for low-voltage logic without margin violation. |
| Max Dropout Voltage | 1.2 V at 1 A load - enables operation from 2.4 V input, supporting wide-input legacy or battery-derived supplies. |
| Output Current | 1 A continuous - sufficient for powering multi-core MCU cores or FPGA I/O banks with dynamic current demands. |
| Load Regulation | ±4 mV (0–1 A) - maintains tight voltage control during rapid load transients typical in digital switching circuits. |
| Ripple Rejection | 80 dB at 120 Hz - suppresses switching noise from upstream DC/DC converters feeding sensitive analog or RF subsystems. |
| Junction Temp Range | −40°C to +125°C - supports deployment in under-hood automotive modules, industrial PLCs, and outdoor edge nodes. |
| Quiescent Current | 4–10 mA - minimizes no-load power loss in always-on subsystems such as real-time clocks or sensor wake-up circuits. |
Pinout & Package
Package: TO252-3L (DPAK), surface-mount, thermally enhanced with exposed tab connected to VOUT for improved heat dissipation (θJC = 12°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Adj/GND) | Ground reference terminal | Internally tied to GND for fixed-output variants; provides feedback reference point for stability and thermal sensing path. |
| 2 (VOUT) | Regulated output node | Delivers 1.2 V to load; tab is electrically connected to this pin-must be soldered to large copper pour for thermal management. |
| 3 (VIN) | Unregulated input supply | Accepts 2.7–18 V input; requires ≥1.3 V headroom above VOUT to maintain regulation; decoupling capacitor essential near pin. |
Key Features
| Feature | Design Value |
|---|---|
| MLCC-compatible stability | Guaranteed stable with 4.7 µF X7R ceramic (ESR 0.05–0.5 Ω), eliminating need for bulkier tantalum or electrolytic capacitors. |
| Fast transient response | Sub-10 µs recovery from 500 mA load step (with 4.7 µF MLCC), critical for burst-mode digital loads like DDR I/O or USB PHYs. |
| Integrated thermal shutdown | Auto-cycles output at ~150°C junction temperature-prevents permanent damage during sustained overload or poor heatsinking. |
| AEC-Q100 Grade 2 qualified | Validated for −40°C to +105°C ambient operation with PPAP support-enables use in automotive infotainment and ADAS auxiliary rails. |
| Low ground current | 35–120 µA at 7 V input - reduces system-level quiescent power, especially beneficial in battery-backed or energy-harvesting applications. |
Applications
| FPGA Core Power | Automotive Infotainment I/O |
|---|---|
|
Use Scenario: Supplying 1.2 V core voltage to Xilinx Artix-7 or Intel Cyclone V FPGA fabric under dynamic switching loads up to 900 mA. IC Role / Device Role / Timing Role: Primary low-noise, low-dropout core regulator delivering tightly regulated voltage independent of input rail sag during logic transitions. Use Value: Maintains <±2% output accuracy across −40°C to +125°C, preventing timing violations or configuration corruption during thermal cycling. |
Use Scenario: Providing clean 1.2 V supply to LVDS serializer/deserializer interfaces in automotive head unit display links. IC Role / Device Role / Timing Role: Noise-suppressing post-regulator cleaning switching converter output before high-speed differential signaling paths. Use Value: 80 dB ripple rejection at 120 Hz eliminates switching artifacts that would otherwise induce jitter in pixel clock distribution. |
| Industrial PLC Digital I/O | Medical Sensor Signal Chain |
|
Use Scenario: Powering isolated 1.2 V logic for ARM Cortex-M7-based I/O modules handling 24 V field inputs with optocoupler interface circuitry. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring stable logic thresholds despite long PCB traces and shared ground returns. Use Value: ±4 mV load regulation prevents false triggering of digital inputs during simultaneous actuator switching events. |
Use Scenario: Biasing precision ADC reference buffers and low-noise op-amps in portable ECG front-end modules operating from single-cell Li-ion. IC Role / Device Role / Timing Role: Ultra-low-noise analog domain regulator minimizing PSRR-induced offset drift in 24-bit delta-sigma converters. Use Value: 1.2 V output with <0.1%/W thermal regulation avoids gain error drift during extended acquisition periods. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar low-dropout linear regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AZ1117C-1.2TRG1 | 1.2 V fixed, SOT-223, 1 A, ±2% tolerance, but only rated to +125°C junction (not AEC-Q100 qualified). | Lacks automotive qualification and has higher θJA (107°C/W vs. 73°C/W), limiting power density in compact enclosures. | Select when cost sensitivity outweighs thermal performance or automotive compliance requirements. |
| TLV1117-12CDCYR | 1.2 V fixed, SOT-223, 1 A, ±1% initial tolerance, but dropout is 1.3 V at 1 A and not AEC-Q100 qualified. | Higher dropout reduces usable input range; no thermal shutdown latch-requires external protection for sustained overload. | Choose only if tighter initial accuracy is prioritized over thermal robustness and automotive readiness. |
Compared with AZ1117C-1.2TRG1 and TLV1117-12CDCYR, the ZLDO1117K12TC offers superior thermal performance (θJA = 73°C/W), integrated thermal shutdown with auto-recovery, and AEC-Q100 Grade 2 validation-making it the preferred choice for space-constrained, high-reliability industrial and automotive-adjacent designs.
Availability
ZLDO1117K12TC is available at Aetrix Electronics and suitable for FPGA core power, automotive infotainment I/O, and industrial PLC digital I/O requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ZLDO1117K12TC 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 across Asia, Europe, and the US, serving industrial, automotive, and consumer markets.
The ZLDO1117 series belongs to Diodes' high-reliability LDO portfolio, engineered specifically for demanding industrial and automotive applications where thermal resilience, capacitor flexibility, and long-term supply stability are critical.
FAQ
What is the minimum input voltage required for regulation at full 1 A load?
The ZLDO1117K12TC requires VIN ≥ VOUT + 1.3 V = 2.5 V to maintain regulation at 1 A, per datasheet Note 8. Below this, the device enters dropout mode with reduced but non-regulated output. The absolute minimum VIN is 2.7 V for guaranteed specification compliance across temperature and line variation.
Can the ZLDO1117K12TC be used with 1 µF ceramic input capacitors?
Yes-datasheet Figure 6 confirms stable operation with 1 µF MLCC on VIN when paired with 4.7 µF MLCC on VOUT. Input capacitance primarily filters high-frequency noise and limits inrush; 1 µF X7R is sufficient for most board-level layouts, though larger values improve transient immunity from upstream converters.
Is the TO252 tab electrically connected, and how must it be handled on the PCB?
Yes-the TO252 tab is internally connected to VOUT (Pin 2). It must be soldered to a dedicated copper pour tied directly to the 1.2 V output net-not to ground or floating. This connection serves dual roles: thermal conduction (θJC = 12°C/W) and electrical integrity for low-impedance output return path.
Does the ZLDO1117K12TC require an external bypass capacitor on the adjust pin?
No-the adjust pin is internally grounded for fixed-output variants like ZLDO1117K12TC. External bypassing applies only to adjustable versions (e.g., ZLDO1117KTC). No additional components are needed on Pin 1 beyond standard input/output decoupling.
ZLDO1117K12TC 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):
- 1.2V
- 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
ZLDO1117K12TC FAQ
1.How can I place an order for ZLDO1117K12TC through Aetrix?
Please submit a Request for Quotation (RFQ) for ZLDO1117K12TC 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 ZLDO1117K12TC reliable?
The price and inventory of ZLDO1117K12TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117K12TC is usually 5 days.
3.What payment methods are accepted for ZLDO1117K12TC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117K12TC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ZLDO1117K12TC?
ZLDO1117K12TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ZLDO1117K12TC 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 ZLDO1117K12TC?
For technical support, including ZLDO1117K12TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117K12TC requirements.
6.How does Aetrix verify that ZLDO1117K12TC is sourced from the original manufacturer or authorized distributors?
All ZLDO1117K12TC 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 ZLDO1117K12TC meets industry standards.
7.What is the process for return or replacement of ZLDO1117K12TC?
All ZLDO1117K12TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117K12TC, 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 ZLDO1117K12TC part is unused and in its original packaging.
Return procedure for ZLDO1117K12TC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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