Send an Inquiry

To receive a quote for your project, please fill in the following information, and we’ll get back to you promptly.

Submit Inventory List

Please fill in the following information, and we’ll get back to you promptly.

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

Diodes Incorporated AP1119Y33L-13

Name: AP1119Y33L-13
Brand: Diodes Incorporated
SKU: AP1119Y33L-13
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

Compare

Part No.:: AP1119Y33L-13

Manufacturer:: Diodes Incorporated

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

Package:: SOT-89-5/6

Datasheet:: AP1119Y33L-13.pdf

Description:: IC REG LINEAR 3.3V 500MA SOT89-5

Quantity:: RFQ Add To RFQ list

Payment:

Shipping:

Inventory:2,309

Please send an inquiry. Send us your inquiry, and we will respond immediately.

Product details

Overview

AP1119Y33L-13 from Anachip Corp. is a 0.5A positive low-dropout fixed-output linear regulator with 3.3V output, TTL/CMOS-compatible enable input, 1.3V max dropout at full load, and SOT89-5L package. It delivers stable 3.3V supply for low-voltage logic, bus termination, and VGA card power rails under input voltages up to 18V.

For engineers reviewing the AP1119Y33L-13 datasheet, AP1119Y33L-13 pinout, AP1119Y33L-13 application, or AP1119Y33L-13 equivalent, key selection criteria include dropout voltage at 500mA, enable logic polarity, thermal resistance (θ_JA = 300°C/W), output voltage accuracy (±1%), and minimum load current requirement (5–10mA).

Technical Context

The AP1119Y33L-13 integrates a PNP pass transistor with internal current limiting and thermal shutdown circuitry. Its enable pin features an internal ~100kΩ pull-down resistor, requiring logic-low (≤0.8V) to activate regulation and logic-high (≥2.0V) to disable output.

Designed for fixed 3.3V operation, it maintains regulation with input as low as 4.8V (V_OUT + 1.5V) and supports up to 18V input. Load and line regulation are specified at constant junction temperature using low-duty-cycle pulse testing to isolate thermal drift effects.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	3.300 V ±1% (3.235–3.365 V) at 10mA, 25°C - ensures compatibility with 3.3V logic families
Max Dropout Voltage	1.3 V at 0.5A - enables operation from 4.6V input in worst-case conditions
Enable Threshold	Logic-low ≤0.8V (enable), logic-high ≥2.0V (disable) - compatible with standard TTL/CMOS I/O
Thermal Resistance θ_JA	300 °C/W (SOT89-5L, no heatsink/no airflow) - limits continuous 0.5A operation to <5W dissipation
Load Regulation	26–33 mV (0–0.5A) - defines output shift under full dynamic load change
Ripple Rejection	60–70 dB at 120 Hz - suppresses low-frequency input ripple from switching supplies
Quiescent Current	Not explicitly specified, but minimum load current is 5–10 mA - sets lower bound for stable regulation

Pinout & Package

SOT89-5L package with exposed tab electrically connected to V_OUT; tab must be soldered to PCB copper for thermal performance and electrical connection. Pin 1 = GND, Pin 2 = V_IN, Pin 3 = V_OUT, Pin 4 = EN, Pin 5 = NC (no internal connection).

Pin/Terminal	Circuit Role	Design Meaning
1	GND	Ground reference for control circuitry and feedback path; requires low-impedance connection to system ground plane
2	V_IN	Main input supply; must remain ≥V_OUT + 1.3V to sustain regulation; decoupled with ≥100µF capacitor
3	V_OUT	Regulated 3.3V output; tab is internally bonded to this pin - must connect to power plane for thermal management
4	EN	Active-low enable input; internal 100kΩ pull-down ensures default-on behavior when left floating
5	NC	No internal connection - must remain unconnected per datasheet; not usable as thermal pad or auxiliary terminal

Key Features

Feature	Design Value
Low dropout at full load	1.3V max at 0.5A - enables use with narrow input–output margins (e.g., 5V-to-3.3V conversion)
TTL/CMOS-compatible EN	Logic-low enable with internal pull-down - eliminates need for external biasing in most microcontroller-controlled systems
Integrated protection	Current limiting and thermal shutdown - prevents damage during short-circuit or overload without external components
High PSRR at low frequency	60–70 dB at 120 Hz - effectively filters ripple from AC/DC adapters and upstream DC/DC converters
Stable with ceramic/tantalum	Guaranteed stability with ≥10µF output capacitor - supports common low-ESR capacitors without series resistance

Applications

PC Peripheral Power

VGA Card Supply

Use Scenario: Providing clean 3.3V rail to USB hubs, card readers, or SATA controllers on add-in cards.

IC Role / Device Role / Timing Role: Primary 3.3V LDO regulator delivering regulated power to interface ICs and level-shifters.

Use Value: Maintains tight output tolerance (±1%) and fast transient response to handle burst data transfers without brownout.

Use Scenario: Supplying 3.3V to analog front-end circuitry and digital logic on legacy VGA graphics cards.

IC Role / Device Role / Timing Role: Fixed-output LDO powering DACs, clock buffers, and display controller I/O banks.

Use Value: Low dropout allows direct derivation from 5V rail; high noise rejection preserves analog signal integrity.

Low-Voltage Bus Termination

Communication Module Bias

Use Scenario: Generating 3.3V termination voltage for high-speed parallel buses (e.g., PCI, LPC) in embedded controllers.

IC Role / Device Role / Timing Role: Precision voltage source for parallel bus pull-up/pull-down networks.

Use Value: Tight line/load regulation (≤33 mV) ensures consistent termination impedance across varying supply and load conditions.

Use Scenario: Powering RS-232/RS-485 transceivers and modem ICs in industrial communication modules.

IC Role / Device Role / Timing Role: Local 3.3V bias supply enabling logic-level compatibility with MCU UART peripherals.

Use Value: Enable pin allows software-controlled power gating to reduce standby current in battery-backed designs.

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
MIC29302-3.3WT	Higher output current (3A), higher dropout (0.4V typ. at 3A), TO-220 package	Requires heatsinking; suited for higher-power loads where SOT89-5L thermal limits are exceeded	Select when >0.5A continuous current or better thermal margin is required
AP2112K-3.3TRG1	Lower quiescent current (~60 µA), SOT-23-5 package, 600mA rating, no enable pin	Lacks EN function; smaller footprint but lower thermal mass and no logic control	Select for space-constrained, always-on 3.3V rails where enable control is unnecessary

Compared with MIC29302-3.3WT and AP2112K-3.3TRG1, the AP1119Y33L-13 uniquely balances 0.5A capability, enable functionality, and SOT89-5L thermal performance - making it optimal for mid-power, logic-controlled 3.3V regulation where board area and discrete control are constrained.

Availability

AP1119Y33L-13 is available at Aetrix Electronics and suitable for PC peripheral power, VGA card supply, and communication module bias requiring stable component supply and lead-free compliance.

Supply support for AP1119Y33L-13 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

Anachip Corp. is a Taiwan-based semiconductor company specializing in analog and mixed-signal power management ICs, founded in 1996 and focused on cost-effective, high-reliability solutions for consumer and industrial markets.

The AP1119 series belongs to Anachip's low-dropout linear regulator product line, designed specifically for fixed-output, medium-current applications in PC peripherals, graphics cards, and communication interfaces where simplicity, enable control, and thermal robustness are prioritized over ultra-low quiescent current.

FAQ

Is AP1119Y33L-13 pin-compatible with other AP1119 variants?

Yes - all AP1119 fixed-output variants (e.g., Y15L, Y18L, Y25L) share identical SOT89-5L pinout and terminal assignments. Only the output voltage and marking code differ; no PCB redesign is needed when changing voltage versions.

What is the minimum input voltage required for regulation at 0.5A load?

The minimum input voltage is V_OUT + dropout = 3.3V + 1.3V = 4.6V. At 25°C and 0.5A load, regulation is guaranteed down to 4.6V input; derating applies above 25°C due to thermal effects on dropout.

Can AP1119Y33L-13 operate without an output capacitor?

No - a minimum 10µF capacitor is required from V_OUT to GND for stability, as specified in the datasheet. Omitting it risks oscillation or loss of regulation, especially under transient load conditions.

Does the NC pin (Pin 5) serve any thermal or electrical function?

No - Pin 5 is explicitly designated "NC" (no internal connection) in the datasheet. It must remain unconnected; routing it to ground or V_OUT violates the design and may compromise reliability or thermal performance.

AP1119Y33L-13 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: SOT-89-5/6

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):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 1.3V @ 500mA

Current - Output:: 500mA

Current - Quiescent (Iq):: 10 mA

Current - Supply (Max):: -

PSRR:: 60dB (120Hz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature

Operating Temperature:: 0°C ~ 150°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: SOT-89-5

AP1119Y33L-13 FAQ

1.How can I place an order for AP1119Y33L-13 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP1119Y33L-13 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 AP1119Y33L-13 reliable?

The price and inventory of AP1119Y33L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1119Y33L-13 is usually 5 days.

3.What payment methods are accepted for AP1119Y33L-13?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1119Y33L-13 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP1119Y33L-13?

AP1119Y33L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP1119Y33L-13 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 AP1119Y33L-13?

For technical support, including AP1119Y33L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1119Y33L-13 requirements.

6.How does Aetrix verify that AP1119Y33L-13 is sourced from the original manufacturer or authorized distributors?

All AP1119Y33L-13 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 AP1119Y33L-13 meets industry standards.

7.What is the process for return or replacement of AP1119Y33L-13?

All AP1119Y33L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1119Y33L-13, 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 AP1119Y33L-13 part is unused and in its original packaging.

Return procedure for AP1119Y33L-13:

1.Submit a request within 90 days.

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

Tech Hub

2026-09-03 Logic Level Shifter: How to Connect 3.3V and 5V Logic Safely

A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.

2026-09-03 74HC595 vs TPIC6B595: Output Drive, Pinout, Current, and Load Selection

The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…

2026-09-01 74HC595 Pinout, Timing, Output Current, and Applications

The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…

2026-09-01 Latch vs Flip-Flop: Timing, Differences and Design Choices

A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…

2026-08-30 D Latch Circuit: Truth Table, Timing, ICs and Applications

A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …

2026-08-28 SR Latch Explained: NOR and NAND Circuits, Truth Tables, and Applications

An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…

2026-08-27 Latch Circuit: SR and D Latches, Truth Tables, Timing, and Applications

Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…

2026-08-21 What Is an LED Driver? Types, Circuits, Dimming, and Selection

An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…

2026-08-18 Operational Amplifier (Op Amp): Basics, Configurations, Feedback and Applications

Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…

2026-08-14 Jumper Cables: How to Use, Connect and Choose Them Safely

Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…