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

Diodes Incorporated ZLDO1117K18TC

Name: ZLDO1117K18TC
Brand: Diodes Incorporated
SKU: ZLDO1117K18TC
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: ZLDO1117K18TC

Manufacturer:: Diodes Incorporated

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

Package:: TO-252-3, DPAK (2 Leads + Tab), SC-63

Datasheet:: ZLDO1117K18TC.pdf

Description:: IC REG LINEAR 1.8V 1A TO252-3

Quantity:: RFQ Add To RFQ list

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Inventory:878

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Product details

Overview

ZLDO1117K18TC from Diodes Incorporated is a fixed-output 1.8 V, 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 compatibility with MLCC output capacitors. It delivers stable 1.8 V core power for high-speed logic and I/O interfaces in automotive and industrial control systems.

For engineers reviewing the ZLDO1117K18TC datasheet, ZLDO1117K18TC pinout, ZLDO1117K18TC application, or ZLDO1117K18TC equivalent, key selection criteria include dropout voltage under 1.2 V at 1 A, thermal shutdown protection, ripple rejection of 60–80 dB at 120 Hz, and AEC-Q100 Grade 2 qualification for automotive use.

Technical Context

The ZLDO1117K18TC employs a bandgap reference and error amplifier architecture to maintain precise 1.8 V output across line, load, and temperature variations. Its internal current limiting and thermal shutdown circuitry activate at ≥150°C junction temperature, ensuring safe operation during overload or ambient thermal stress.

Designed for stability with low-ESR ceramic capacitors (≥4.7 µF, ESR ≤ 0.5 Ω), it achieves fast transient response without requiring external compensation. The device operates with input voltages from 3.2 V to 18 V - sufficient to support 1.8 V regulation even with 1.3 V minimum headroom.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	1.800 V ±2% (guaranteed across −40°C to +125°C, 10 mA–1 A load)
Dropout Voltage	1.2 V max at 1 A load (enables regulation with VIN as low as 3.0 V)
Quiescent Current	4–10 mA (low bias current preserves efficiency in standby modes)
Ripple Rejection	60–80 dB at 120 Hz (suppresses switching noise from upstream DC/DC converters)
Thermal Shutdown	Activates at ~150°C junction temperature (prevents permanent damage during sustained overload)
Output Capacitor Requirement	Min. 4.7 µF X7R MLCC (ESR ≤ 0.5 Ω) - enables compact, reliable PCB layout
AEC-Q100 Grade	Grade 2 qualified (−40°C to +105°C ambient, validated for automotive ECUs)

Pinout & Package

Package: TO252-3L (DPAK), surface-mount, thermally enhanced with exposed tab connected to VOUT for improved heat dissipation (θ_JA = 73°C/W on 2″×2″ 1 oz copper PCB).

Pin/Terminal	Circuit Role	Design Meaning
1 (Adj/GND)	Reference node / Ground return	Internally tied to GND for fixed 1.8 V version; provides feedback reference point for adjustable variants
2 (VOUT)	Regulated output	Delivers 1.8 V ±2%; tab is electrically connected to this pin - must be routed to ground plane for thermal performance
3 (VIN)	Unregulated input	Accepts 3.2–18 V supply; requires ≥1.3 V headroom above VOUT to maintain regulation

Key Features

Feature	Design Value
Low dropout at full load	1.2 V max @ 1 A - enables use with 3.3 V or 5 V rails to generate 1.8 V efficiently
MLCC-compatible stability	Stable with ≥4.7 µF X7R ceramic (ESR ≤ 0.5 Ω) - eliminates need for bulkier tantalum/electrolytic caps
Fast transient response	Sub-10 µs recovery from 100 mA ↔ 500 mA load steps - maintains tight regulation for digital I/O bursts
AEC-Q100 Grade 2	Qualified for automotive under-hood applications (−40°C to +105°C ambient)
Integrated protection	Current limiting + thermal shutdown - no external circuitry needed for fault resilience

Applications

Automotive Body Control Module

Industrial PLC I/O Interface

Use Scenario: Powering 1.8 V FPGA configuration banks and CAN transceiver logic in body control units.

IC Role / Device Role / Timing Role: Primary 1.8 V core regulator supplying configurable logic and communication peripherals.

Use Value: AEC-Q100 Grade 2 qualification ensures reliability across vehicle lifecycle; 1.2 V dropout allows direct derivation from 3.3 V domain without intermediate conversion.

Use Scenario: Providing clean 1.8 V supply to isolated digital input buffers and fieldbus PHYs in programmable logic controllers.

IC Role / Device Role / Timing Role: Local point-of-load regulator decoupling noise-sensitive interface ICs from noisy 24 V system rails.

Use Value: 80 dB ripple rejection suppresses switching noise from upstream 24 V-to-5 V DC/DC converters, preventing data corruption on RS-485/Modbus links.

High-Speed Memory Interface

Medical Sensor Signal Chain

Use Scenario: Supplying 1.8 V to DDR3/DDR4 memory termination networks and level shifters in embedded vision systems.

IC Role / Device Role / Timing Role: Low-noise, fast-response regulator stabilizing bus termination voltage during burst read/write cycles.

Use Value: Fast transient response (<10 µs) prevents voltage droop-induced timing violations on high-speed parallel buses.

Use Scenario: Powering ultra-low-noise analog front-end ICs (e.g., instrumentation amplifiers, ADC drivers) in portable diagnostic devices.

IC Role / Device Role / Timing Role: Precision analog supply rail isolating sensitive signal paths from digital switching noise.

Use Value: ±2% output tolerance and <0.5% thermal drift ensure consistent gain calibration across operating temperature range.

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
AP1117K-18L-13	1.8 V fixed, 1 A, SOT-223 only; dropout 1.3 V @ 1 A; no AEC-Q100 qualification	Limited to commercial temp range (−20°C to +85°C); lower thermal performance (θ_JA = 107°C/W)	Use where cost and footprint are prioritized over automotive qualification and thermal headroom.
MCP1700T-1802E/MB	1.8 V fixed, 250 mA only; 600 mV dropout @ 250 mA; SOT-23 package	Insufficient current for 1 A loads; suitable only for auxiliary rails or low-power sensors	Select only for sub-250 mA bias supplies where space constraints prohibit TO252 mounting.

Compared with AP1117K-18L-13 and MCP1700T-1802E/MB, the ZLDO1117K18TC uniquely combines 1 A output, 1.2 V dropout, AEC-Q100 Grade 2, and TO252 thermal capability - making it the sole fit for automotive 1.8 V core regulation under sustained load and elevated ambient temperature.

Availability

ZLDO1117K18TC is available at Aetrix Electronics and suitable for automotive ECUs, industrial PLCs, and medical sensor modules requiring stable component supply with full traceability and long-term lifecycle support.

Supply support for ZLDO1117K18TC 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, and computing markets.

The ZLDO1117 series targets high-reliability, low-noise power regulation in harsh environments - designed specifically to replace legacy 1117 regulators with tighter tolerance, lower dropout, and AEC-Q100 compliance.

FAQ

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

The ZLDO1117K18TC requires a minimum input voltage of 3.2 V to maintain regulation at full 1 A load, based on its 1.2 V maximum dropout specification. At lighter loads, regulation is maintained down to VIN = VOUT + 1.3 V (i.e., 3.1 V), but datasheet-recommended minimum is 3.2 V to ensure margin across temperature and process variation.

Can the ZLDO1117K18TC be used with 2.2 µF MLCC output capacitors?

No - the device requires a minimum 4.7 µF output capacitor with ESR between 0.05 Ω and 0.5 Ω for guaranteed stability. Using 2.2 µF violates the stability condition and may cause oscillation or poor transient response, as confirmed by the SOA curve and application notes in DS32018 Rev. 7–3.

Is the exposed tab on the TO252 package electrically connected, and how should it be handled?

Yes, the exposed tab is internally connected to the VOUT pin. It must be soldered to a dedicated copper pour tied to the 1.8 V output net - not to ground - to avoid shorting. This connection is essential for both thermal conduction (θ_JC = 12°C/W) and electrical integrity per the pin assignment diagram.

Does the ZLDO1117K18TC support reverse polarity input protection?

No - the device lacks integrated reverse-voltage protection. If input reversal is possible in the system, an external series Schottky diode (e.g., MBR0520L) must be added between the input source and VIN pin, as recommended in Figure 2 Note D of the datasheet to prevent latch-up or damage.

ZLDO1117K18TC 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):: 1.8V

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:: TO-252-3

ZLDO1117K18TC FAQ

1.How can I place an order for ZLDO1117K18TC through Aetrix?

Please submit a Request for Quotation (RFQ) for ZLDO1117K18TC 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 ZLDO1117K18TC reliable?

The price and inventory of ZLDO1117K18TC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ZLDO1117K18TC is usually 5 days.

3.What payment methods are accepted for ZLDO1117K18TC?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ZLDO1117K18TC transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for ZLDO1117K18TC?

ZLDO1117K18TC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your ZLDO1117K18TC 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 ZLDO1117K18TC?

For technical support, including ZLDO1117K18TC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ZLDO1117K18TC requirements.

6.How does Aetrix verify that ZLDO1117K18TC is sourced from the original manufacturer or authorized distributors?

All ZLDO1117K18TC 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 ZLDO1117K18TC meets industry standards.

7.What is the process for return or replacement of ZLDO1117K18TC?

All ZLDO1117K18TC units undergo pre-shipment inspection (PSI). If there is an issue with ZLDO1117K18TC, 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 ZLDO1117K18TC part is unused and in its original packaging.

Return procedure for ZLDO1117K18TC:

1.Submit a request within 90 days.

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

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