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Diodes Incorporated AP1118D33L-13
- Part No.:
- AP1118D33L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-6, DPAK (5 Leads + Tab)
- Datasheet:
-
AP1118D33L-13.pdf
- Description:
- IC REG LINEAR 3.3V 1A TO252-5
- Quantity:
- Payment:
- Shipping:
Inventory:3,124
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Product details
Overview
AP1118D33L-13 from Anachip Corp. is a 1A low-dropout linear regulator with fixed 3.3V output, TTL/CMOS-compatible enable pin, and 1.4V max dropout at full load. It delivers stable 3.3V supply for high-speed bus termination and low-current logic circuits, operating from up to 18V input with thermal shutdown and current limiting.
For engineers reviewing the AP1118D33L-13 datasheet, AP1118D33L-13 pinout, AP1118D33L-13 application, or AP1118D33L-13 equivalent, key selection criteria include dropout voltage under 1A load, EN logic polarity, thermal resistance in TO252-5L package, and guaranteed 3.3V output tolerance across temperature and line/load variations.
Technical Context
The AP1118D33L-13 integrates a PNP pass transistor with internal error amplifier, reference, and protection circuitry to maintain regulation with minimal headroom. Its enable function uses an internal ~100kΩ pull-down resistor, requiring logic-low or open condition for activation.
Designed for fixed-output use, it achieves 60–70dB ripple rejection at 120Hz with 25µF tantalum output capacitor and exhibits fast transient response-under 200µs recovery for 100mA–1A load steps-due to optimized internal compensation and low ESR capacitor requirements.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300 V ±2% (guaranteed over 0–125°C junction temp, 10mA–1A load) |
| Dropout Voltage | ≤1.4 V at 1A load (enables regulation with VIN as low as 4.7V for 3.3V output) |
| Load Regulation | ≤33 mV (0–1A load change at 5V input; ensures stable rail under dynamic CPU/memory loads) |
| Line Regulation | ≤0.2% (input 4.8–15V; maintains accuracy despite upstream DC/DC variation) |
| Ripple Rejection | 60–70 dB at 120Hz (suppresses switching noise from preceding converters) |
| Enable Threshold | VEN(LOW) ≤0.8 V, VEN(HIGH) ≥1.6 V (TTL/CMOS compatible; supports direct MCU GPIO control) |
| Thermal Resistance θJA | 102 °C/W (TO252-5L package; requires minimal PCB copper area for 1A continuous operation) |
Pinout & Package
AP1118D33L-13 is packaged in lead-free TO252-5L (DPAK) surface-mount format with exposed thermal pad. Pin 1 is Vin, Pin 2 is GND, Pin 3 is EN, Pin 4 is Vout (tab), Pin 5 is Vout (pin). The metal tab is electrically connected to Vout and serves as primary heat path.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 (Vin) | Input supply connection | Must be ≥4.7V for regulation; requires ≥100µF bulk capacitor to prevent sag during 1A transients |
| Pin 2 (GND) | Ground reference | Low-impedance return path for all internal circuits; must tie directly to power ground plane |
| Pin 3 (EN) | Enable control input | Logic-low (≤0.8V) enables output; open or logic-high (≥1.6V) disables output with internal 100kΩ pull-down |
| Pins 4 & 5 (Vout) | Regulated output terminals | Both pins and metal tab connect to 3.3V output; tab provides primary thermal conduction to PCB copper |
Key Features
| Feature | Design Value |
|---|---|
| 1.4V max dropout at 1A | Enables efficient 3.3V generation from 5V or 12V rails without switching losses or EMI |
| TTL/CMOS-compatible EN pin | Eliminates need for level-shifting circuitry when controlled by 3.3V or 5V microcontrollers |
| Built-in thermal shutdown | Protects device during overload or insufficient heatsinking; auto-recovery on cooldown |
| Output current limiting | Clamps short-circuit current to ~1.1A, preventing damage to regulator or downstream circuitry |
| 60–70dB ripple rejection | Reduces conducted noise from upstream DC/DC converters, easing analog/RF section filtering |
Applications
| PC Peripheral Power | Communication Module Supply |
|---|---|
Use Scenario: Providing clean 3.3V rail to USB controller ICs and PCIe endpoint logic on add-in cards. IC Role / Device Role / Timing Role: Primary LDO regulator delivering stable core voltage for high-speed digital interfaces. Use Value: Low dropout ensures compatibility with 5V backplane inputs; fast transient response prevents data corruption during burst transfers. | Use Scenario: Powering baseband processors and RF front-end bias circuits in cellular IoT modules. IC Role / Device Role / Timing Role: Fixed-output voltage source enabling reliable boot and low-noise analog operation. Use Value: High ripple rejection suppresses switching noise from PMIC DC/DC stages, preserving RF sensitivity. |
| VGA Card Logic Supply | Low-Voltage Bus Termination |
Use Scenario: Supplying 3.3V to video DACs, timing controllers, and memory buffers on legacy VGA graphics cards. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring tight voltage tolerance for analog video signal integrity. Use Value: Tight 3.3V output tolerance (±2%) minimizes color banding and timing jitter in analog RGB outputs. | Use Scenario: Biasing parallel termination resistors on high-speed differential buses (e.g., SCSI, LVDS). IC Role / Device Role / Timing Role: Precision voltage reference for termination networks requiring stable 3.3V reference. Use Value: Low output impedance (<10mΩ effective) maintains termination voltage stability during fast edge transitions. |
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 |
|---|---|---|---|
| MIC29302WU-3.3 | Higher dropout (0.4V typ. @ 3A), higher quiescent current (45mA), TO263-5 package | Supports higher output current (3A) but less efficient at light loads | Select for >1A peak loads where thermal margin is critical; not drop-in due to different EN polarity and pinout |
| LD1117S33TR | Lower current rating (800mA), no enable pin, SOT-223 package, 1.2V dropout @ 800mA | Lacks remote ON/OFF control; limited to space-constrained, lower-power designs | Choose when board space is constrained and enable functionality is unnecessary; verify thermal derating at 1A |
Compared with MIC29302WU-3.3 and LD1117S33TR, AP1118D33L-13 uniquely balances 1A capability, 1.4V dropout, integrated enable, and TO252-5L thermal performance-making it optimal for mid-power embedded systems needing controllable, noise-immune 3.3V rails.
Availability
AP1118D33L-13 is available at Aetrix Electronics and suitable for PC peripheral power, communication module supply, and VGA card logic supply requiring stable component supply and long-term industrial availability.
Supply support for AP1118D33L-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 power management ICs, with focus on cost-effective, high-reliability solutions for consumer and industrial markets.
The AP1118 product line delivers fixed-output LDO regulators targeting low-noise, medium-current local power delivery in legacy and cost-sensitive embedded systems-emphasizing simplicity, thermal robustness, and broad input voltage range.
FAQ
What is the minimum input voltage required for AP1118D33L-13 to regulate at full 1A load?
The minimum input voltage is 4.7V: this satisfies the 1.4V maximum dropout specification (3.3V + 1.4V = 4.7V). Below this, regulation fails and output voltage drops proportionally with input. Input must also remain ≥1.3V above Vout per datasheet-consistent with the 1.4V dropout limit.
Does AP1118D33L-13 require an external output capacitor, and what type is recommended?
Yes-a minimum 10µF capacitor is mandatory from Vout to GND for stability. The datasheet specifies optimal performance with 100µF electrolytic or tantalum capacitors; ceramic capacitors may be used if ≥10µF and low-ESR, but require careful layout to avoid oscillation due to zero placement.
How does the enable pin behave when left unconnected?
When unconnected, the internal 100kΩ pull-down resistor holds EN at logic-low, enabling the output. This default-active behavior simplifies designs where always-on operation is acceptable; for safety-critical applications, explicitly driving EN low is recommended to ensure deterministic startup.
Can AP1118D33L-13 be used in parallel to increase output current?
No-parallel operation is not supported. The device lacks current-sharing features like precision output matching or external current-sense inputs. Attempting parallel connection risks thermal runaway due to minor Vout mismatches, leading to uneven current distribution and potential failure of one unit.
AP1118D33L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-6, DPAK (5 Leads + Tab)
- 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):
- 1.4V @ 1A
- Current - Output:
- 1A
- 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:
- TO-252-5
AP1118D33L-13 FAQ
1.How can I place an order for AP1118D33L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1118D33L-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 AP1118D33L-13 reliable?
The price and inventory of AP1118D33L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1118D33L-13 is usually 5 days.
3.What payment methods are accepted for AP1118D33L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1118D33L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1118D33L-13?
AP1118D33L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1118D33L-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 AP1118D33L-13?
For technical support, including AP1118D33L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1118D33L-13 requirements.
6.How does Aetrix verify that AP1118D33L-13 is sourced from the original manufacturer or authorized distributors?
All AP1118D33L-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 AP1118D33L-13 meets industry standards.
7.What is the process for return or replacement of AP1118D33L-13?
All AP1118D33L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1118D33L-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 AP1118D33L-13 part is unused and in its original packaging.
Return procedure for AP1118D33L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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