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Diodes Incorporated AP1118S33L-13
- Part No.:
- AP1118S33L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
AP1118S33L-13.pdf
- Description:
- IC REG LINEAR 3.3V 1A 8SOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,399
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Product details
Overview
AP1118S33L-13 from Anachip Corp. is a 1A low-dropout linear regulator with fixed 3.3V output, TTL/CMOS-compatible enable function, and 1.4V maximum dropout at full load. It delivers stable voltage for high-speed bus termination and low-current 3.3V logic supplies in PC peripherals and communication modules, operating with input up to 18V.
For engineers reviewing the AP1118S33L-13 datasheet, AP1118S33L-13 pinout, AP1118S33L-13 application, or AP1118S33L-13 equivalent, key selection criteria include dropout voltage under 1.4V at 1A, thermal shutdown protection, ±1% output voltage accuracy at 10mA, and SOP-8L lead-free packaging compatibility with standard PCB assembly processes.
Technical Context
The AP1118S33L-13 integrates a PNP pass transistor with internal current limiting and thermal shutdown circuitry, enabling safe operation under overload and elevated junction temperatures. Its enable pin features an internal 100kΩ pull-down resistor, supporting logic-level control without external biasing.
Designed for fixed-output regulation, it achieves 60–70dB ripple rejection at 120Hz with 25µF tantalum output capacitance and maintains ≤33mV load regulation across 0–1A output current at 25°C ambient, with junction temperature range from 0°C to +150°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±1% at 10mA, ensuring compatibility with 3.3V logic families (e.g., LVTTL, LVCMOS) |
| Dropout Voltage | ≤1.4V at 1A load, allowing regulation from as low as 4.7V input (3.3V + 1.4V) with 18V max input rating |
| Load Regulation | 26–33mV over 0–1A, minimizing output shift during dynamic current draw in digital subsystems |
| Ripple Rejection | 60–70dB at 120Hz, suppressing switching noise from upstream DC/DC converters feeding the LDO |
| Enable Threshold | VEN(LOW) ≤0.8V / VEN(HIGH) ≥1.6V, compatible with 3.3V and 5V logic control signals |
| Thermal Resistance | θJA = 150°C/W (SOP-8L, no heatsink), defining power derating limits in compact PCB layouts |
| Quiescent Current | ≤80µA at VEN = 2.0V, enabling low-power standby modes in always-on applications |
Pinout & Package
SOP-8L package: 8-pin surface-mount plastic IC with exposed thermal pad (pin 5 connected to VOUT tab), RoHS-compliant lead-free finish, JEDEC MS-012AC outline.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VOUT | Main regulated output; requires ≥10µF capacitor to ground for stability; tab connection provides thermal path |
| 2 | GND | Analog ground reference; must be low-impedance connection to minimize noise coupling into regulation loop |
| 3 | EN | Active-low enable input; internal 100kΩ pull-down ensures default ON state when left floating or driven by open-drain logic |
| 4 | VIN | Input supply; must exceed VOUT by ≥1.3V to maintain regulation; decoupling capacitor required |
| 5 | VOUT (Tab) | Exposed thermal pad tied to output voltage; soldered to PCB copper pour for heat dissipation |
| 6–8 | VOUT | Additional output pins reduce trace resistance and improve current sharing; all electrically common with pin 1 and tab |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | ±40mV output deviation during 100mA–1A load steps (typical 100µs recovery), preserving signal integrity in burst-mode systems |
| Built-in thermal shutdown | Activates at TJ ≥150°C with hysteresis, preventing permanent damage during sustained overload or poor heatsinking |
| Output current limiting | Guaranteed 1.1A minimum current limit at 5V differential, protecting downstream circuits during short-circuit events |
| Good noise rejection | 60–70dB attenuation of 120Hz ripple enables clean supply for analog front-ends and clock buffers |
Applications
| PC Peripheral Power | Communication Module Supply |
|---|---|
Use Scenario: Providing stable 3.3V rail to USB controller ICs and PCIe endpoint logic on add-in cards. IC Role / Device Role / Timing Role: Primary voltage regulator for interface logic, ensuring compliance with USB 2.0 and PCIe 1.0 signaling voltage tolerances. Use Value: 1.4V dropout allows use of 5V system rails without additional step-down stages, reducing BOM count and board space. | Use Scenario: Powering Ethernet PHY transceivers and UART interfaces in industrial gateways. IC Role / Device Role / Timing Role: Clean, low-noise 3.3V source for data-link layer ICs requiring <±50mV supply variation during packet bursts. Use Value: 60–70dB ripple rejection suppresses switching noise from adjacent DC/DC converters, lowering bit error rates. |
| VGA Card Core Logic | Low-Voltage Bus Termination |
Use Scenario: Delivering regulated 3.3V to VGA controller ASICs and timing generators in legacy graphics adapters. IC Role / Device Role / Timing Role: Main logic supply with fast transient response to handle pixel clock and memory access current spikes. Use Value: ≤33mV load regulation prevents timing skew in parallel RGB data paths during high-resolution refresh cycles. | Use Scenario: Biasing parallel termination resistors on high-speed buses such as PCI-X or AGP. IC Role / Device Role / Timing Role: Precision voltage reference for termination networks, maintaining impedance matching across temperature. Use Value: ±1% output accuracy ensures consistent 3.3V termination voltage, minimizing signal reflections and jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MIC29302WU-3.3 | Higher dropout (0.4V typ. at 3A), TO-263-5 package, 0.1% initial accuracy | Supports higher output current (3A vs. 1A); requires larger PCB footprint and heatsinking | Select when >1A load or tighter initial accuracy is required; not drop-in due to pinout and thermal design differences |
| TPS76333DBVR | Lower quiescent current (85µA), SOT-23-5 package, 2% output tolerance | Rated for 150mA only; unsuitable for 1A applications without parallel configuration | Choose only for ultra-low-power, sub-150mA systems where SOP-8L footprint is not constrained |
Compared with MIC29302WU-3.3 and TPS76333DBVR, the AP1118S33L-13 offers optimal balance of 1A capability, SOP-8L compactness, and 1.4V dropout in cost-sensitive PC peripheral designs-where higher-current alternatives demand redesign, and lower-current options cannot meet load requirements.
Availability
AP1118S33L-13 is available at Aetrix Electronics and suitable for PC peripheral power, communication module supply, VGA card core logic, and low-voltage bus termination requiring stable component supply across extended production lifecycles.
Supply support for AP1118S33L-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 targets low-dropout linear regulation for legacy and mainstream computing peripherals, emphasizing robust thermal performance, enable functionality, and multi-package flexibility for board-level integration.
FAQ
What is the minimum input voltage required for AP1118S33L-13 to regulate at full 1A load?
The device requires VIN ≥ VOUT + 1.3V to maintain regulation, so minimum input is 4.6V (3.3V + 1.3V). At full 1A load, dropout is guaranteed ≤1.4V per datasheet, meaning 4.7V input ensures stable 3.3V output. Input must not exceed 18V absolute maximum rating.
Can AP1118S33L-13 be used without an external output capacitor?
No. A minimum 10µF capacitor is required from VOUT to GND to ensure loop stability and prevent oscillation. The datasheet specifies this as mandatory; omitting it risks output instability, especially under transient loads or with long PCB traces.
How does the EN pin behave when left unconnected?
With internal 100kΩ pull-down resistor, an unconnected EN pin defaults to logic low (≤0.8V), enabling the output. This allows simple ON/OFF control: tie to GND for always-on, drive high (>1.6V) to disable, or leave floating for default enabled operation.
Is AP1118S33L-13 suitable for automotive applications?
No. It is specified for 0°C to +125°C operating junction temperature but lacks AEC-Q100 qualification, automotive-grade screening, or extended temperature range (−40°C to +125°C ambient). It is intended for commercial/industrial PC and communication equipment, not automotive ECUs or infotainment systems.
AP1118S33L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- 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:
- 8-SOP
AP1118S33L-13 FAQ
1.How can I place an order for AP1118S33L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1118S33L-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 AP1118S33L-13 reliable?
The price and inventory of AP1118S33L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1118S33L-13 is usually 5 days.
3.What payment methods are accepted for AP1118S33L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1118S33L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1118S33L-13?
AP1118S33L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1118S33L-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 AP1118S33L-13?
For technical support, including AP1118S33L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1118S33L-13 requirements.
6.How does Aetrix verify that AP1118S33L-13 is sourced from the original manufacturer or authorized distributors?
All AP1118S33L-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 AP1118S33L-13 meets industry standards.
7.What is the process for return or replacement of AP1118S33L-13?
All AP1118S33L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1118S33L-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 AP1118S33L-13 part is unused and in its original packaging.
Return procedure for AP1118S33L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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