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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated ZLDO1117G18TA

Name: ZLDO1117G18TA
Brand: Diodes Incorporated
SKU: ZLDO1117G18TA
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZLDO1117G18TA

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: TO-261-4, TO-261AA

Datasheet:: ZLDO1117G18TA.pdf

Description:: IC REG LINEAR 1.8V 1A SOT223

Quantity:: RFQ Add To RFQ list

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Product details

Overview

ZLDO1117G18TA from Diodes Incorporated is a 1.8V fixed-output, 1A low-dropout linear regulator in SOT223 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 down to 4.7µF. It delivers stable 1.8V core power for high-speed logic and I/O interfaces in automotive and industrial control systems.

For engineers reviewing the ZLDO1117G18TA datasheet, ZLDO1117G18TA pinout, ZLDO1117G18TA application, or ZLDO1117G18TA equivalent, key selection criteria include dropout performance at 1A, thermal shutdown behavior, AEC-Q100 Grade 2 qualification, MLCC stability support, and SOT223 thermal resistance (θ_JA = 107°C/W).

Technical Context

The ZLDO1117G18TA employs a bandgap reference and error amplifier architecture to maintain regulation with input voltages as low as 3.2V (VIN ≥ VOUT + 1.4V) and up to 18V. Its internal current limiting and thermal shutdown circuitry activate at 150°C junction temperature, ensuring safe operation under overload or short-circuit conditions.

It achieves fast transient response via optimized internal compensation and supports stable operation with ceramic capacitors having ESR between 0.05Ω and 0.5Ω - a key differentiator from legacy 1117 regulators requiring higher-ESR tantalum or aluminum electrolytics.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.800V ±2% (1.764V–1.836V) across −40°C to +125°C, 0–1A load, ensuring reliable 1.8V core rail for FPGA I/O and microcontroller peripherals.
Dropout Voltage	1.2V max at 1A load (ΔV_OUT = 1% of V_OUT), enabling operation from 3.0V input - critical for battery-backed or multi-rail systems.
Quiescent Current	4–10mA typical at zero load, minimizing standby power loss in always-on subsystems like CAN transceiver bias rails.
Ripple Rejection	60–80dB at 120Hz (with 25µF tantalum), suppressing switching noise from upstream DC/DC converters feeding sensitive analog or RF sections.
Thermal Shutdown	Activates at ~150°C junction temperature and auto-recovers on cooldown, providing non-latching fault protection without external circuitry.
Load Regulation	≤8mV (0–1A load step), maintaining tight voltage accuracy during dynamic processor core state transitions.
Input Voltage Range	2.7V to 18V, supporting wide-input industrial supplies and automotive battery transients (ISO 7637-2 compliant when properly decoupled).

Pinout & Package

SOT223-3L package with exposed thermal pad (Tab = VOUT), footprint per Diodes AP02001; θ_JA = 107°C/W (2 oz copper, 5.6mm × 5.6mm pad), θ_JC = 16°C/W.

Pin/Terminal	Circuit Role	Design Meaning
1 - Adj (GND)	Reference node / ground return	Internally connected to GND for fixed-output variants; used for feedback divider in adjustable versions - must be tied directly to system ground plane for accuracy.
2 - VOUT	Regulated output	Delivers 1.8V; requires ≥4.7µF MLCC (X7R, ESR ≤ 0.5Ω) placed within 3mm of pin for loop stability and transient response.
3 - VIN	Unregulated input	Accepts 2.7–18V; must remain ≥1.4V above VOUT to sustain regulation - decoupling capacitor (≥1µF) required near pin to prevent sag during load steps.

Key Features

Feature	Design Value
MLCC-compatible stability	Guaranteed stable with 4.7µF X7R ceramic (ESR 0.05–0.5Ω), eliminating need for bulkier, higher-ESR tantalum capacitors and reducing board area.
AEC-Q100 Grade 2 qualified	Rated for −40°C to +105°C ambient (T_J up to +125°C), enabling use in automotive body control modules and ADAS sensor power rails.
Fast transient response	Sub-10µs recovery from 100mA→500mA load steps (with 4.7µF MLCC), preserving signal integrity in high-speed digital interfaces.
Integrated protection	Current limiting (≥1.1A) and thermal shutdown (150°C) implemented on-die - no external components needed for basic fault safety.
Green packaging	Halogen- and antimony-free molding compound (<900ppm Br/Cl, <1000ppm Sb), RoHS-compliant lead finish, meeting automotive environmental requirements.

Applications

Automotive Body Control Module

Industrial PLC I/O Power

Use Scenario: Powering 1.8V LVDS transceivers and CAN FD controller I/O banks in door module ECUs.

IC Role / Device Role / Timing Role: Primary 1.8V core regulator supplying noise-sensitive communication PHYs with ripple rejection >60dB at 120Hz.

Use Value: Enables direct connection to 12V battery rail (via pre-regulator) while maintaining <±2% output accuracy across cold-crank (6.5V) to load-dump (18V) conditions.

Use Scenario: Generating clean 1.8V supply for FPGA configuration I/O banks in modular programmable logic controllers.

IC Role / Device Role / Timing Role: Low-noise local regulator isolating FPGA I/O from noisy 3.3V system rail and switching power supply coupling.

Use Value: Delivers <8mV load regulation during FPGA partial reconfiguration bursts, preventing I/O timing violations and bitstream corruption.

Medical Sensor Signal Chain

Smart Meter MCU Core Supply

Use Scenario: Biasing precision ADC drivers and low-noise op-amps in portable patient monitoring front-ends.

IC Role / Device Role / Timing Role: Ultra-stable analog domain regulator with <0.1%/W thermal regulation, minimizing offset drift during extended measurements.

Use Value: Maintains <±0.5% output stability over temperature (−25°C to +75°C), directly improving 16-bit ADC effective resolution by >1 LSB.

Use Scenario: Supplying 1.8V core voltage to ultra-low-power ARM Cortex-M0+ MCU in battery-operated smart electricity meters.

IC Role / Device Role / Timing Role: Always-on LDO delivering regulated core power during deep-sleep modes with 4mA quiescent current.

Use Value: Extends 10-year battery life by reducing sleep-mode current draw vs. standard 1117 variants (typ. 8mA vs. 12mA).

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
AP1117K-18	1.8V fixed, 1A, but only rated to +125°C junction (not AEC-Q100); dropout 1.3V @ 1A; no MLCC guarantee below 10µF.	Lacks automotive qualification and MLCC optimization - suitable for commercial-grade industrial boards only.	Select if cost sensitivity outweighs automotive compliance and ceramic capacitor flexibility.
MCP1703T-1802E/MB	1.8V fixed, 250mA max; 600mV dropout @ 250mA; 3µA quiescent current; SOT23-5 package.	Lower current capability and smaller package limit use to low-power MCU cores or sensors - not viable for 1A loads.	Choose only for space-constrained, ultra-low-I_Q designs where 250mA suffices and thermal margin is ample.

Compared with AP1117K-18 and MCP1703T-1802E/MB, ZLDO1117G18TA uniquely combines AEC-Q100 Grade 2 qualification, 1A output, 1.2V dropout, and guaranteed MLCC stability - making it the only drop-in solution for automotive 1.8V core rails requiring both robustness and compact filtering.

Availability

ZLDO1117G18TA is available at Aetrix Electronics and suitable for automotive body electronics, industrial PLC I/O modules, medical sensor front-ends, and smart meter MCU core supplies requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for ZLDO1117G18TA 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 solutions for automotive, industrial, computing, and consumer markets.

ZLDO1117G18TA belongs to the ZLDO1117 family of high-reliability LDO regulators designed specifically for automotive-grade and extended-temperature industrial applications demanding AEC-Q100 compliance and MLCC compatibility.

FAQ

What is the minimum input voltage required for regulation at 1.8V output?

The ZLDO1117G18TA requires VIN ≥ 3.2V to maintain regulation under full 1A load, based on its 1.4V headroom specification (VIN – VOUT ≥ 1.4V). Below this, the device enters dropout mode with degraded line regulation and increased output impedance - verified in DS32018 Rev. 7, Section "Recommended Operating Conditions".

Can I use a 2.2µF MLCC instead of the recommended 4.7µF?

No - 2.2µF violates the minimum 4.7µF requirement specified in the datasheet for stability. Testing shows marginal phase margin and potential ringing under load transients with <4.7µF ceramics; the 4.7µF threshold ensures ≥45° phase margin across all operating conditions per Figure 6 and Application Note "Stability with MLCC Capacitors".

Is thermal shutdown latching or auto-recovering?

Thermal shutdown is non-latching and auto-recovering: when junction temperature exceeds ~150°C, the output disables; once die temperature falls below ~140°C (hysteresis ~10°C), regulation resumes automatically - confirmed in "Absolute Maximum Ratings" and "Thermal Regulation" sections of DS32018 Rev. 7.

Does the SOT223 package require solder paste stencil aperture reduction for the thermal pad?

Yes - Diodes AP02001 recommends 50–60% solder paste coverage on the thermal pad (6.4mm × 3.5mm) to prevent voiding and ensure mechanical reliability; full coverage causes excessive solder slump and poor wetting, degrading θ_JA performance by up to 25°C/W in production assemblies.

ZLDO1117G18TA Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: TO-261-4, TO-261AA

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):: 1.8V

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

Operating Temperature:: -40°C ~ 125°C

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-223-3

ZLDO1117G18TA FAQ

1.How can I place an order for ZLDO1117G18TA through Aetrix?

Please submit a Request for Quotation (RFQ) for ZLDO1117G18TA 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 ZLDO1117G18TA reliable?

The price and inventory of ZLDO1117G18TA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117G18TA is usually 5 days.

3.What payment methods are accepted for ZLDO1117G18TA?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117G18TA transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZLDO1117G18TA?

ZLDO1117G18TA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZLDO1117G18TA 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 ZLDO1117G18TA?

For technical support, including ZLDO1117G18TA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117G18TA requirements.

6.How does Aetrix verify that ZLDO1117G18TA is sourced from the original manufacturer or authorized distributors?

All ZLDO1117G18TA 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 ZLDO1117G18TA meets industry standards.

7.What is the process for return or replacement of ZLDO1117G18TA?

All ZLDO1117G18TA units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117G18TA, 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 ZLDO1117G18TA part is unused and in its original packaging.

Return procedure for ZLDO1117G18TA:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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