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Diodes Incorporated AP1115BY33L-13
- Part No.:
- AP1115BY33L-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP1115BY33L-13.pdf
- Description:
- IC REG LINEAR 3.3V 600MA SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,718
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Product details
Overview
AP1115BY33L-13 from Diodes Incorporated is a 0.6A low-dropout positive fixed-mode voltage regulator delivering 3.3V output with ≤1.3V dropout at full load, 60–70dB ripple rejection at 120Hz, and thermal shutdown protection in SOT89-3L package. It supplies stable 3.3V for low-current logic circuits, high-speed bus termination, and VGA card power rails.
For engineers reviewing the AP1115BY33L-13 datasheet, AP1115BY33L-13 pinout, AP1115BY33L-13 application, or AP1115BY33L-13 equivalent, this page provides verified electrical parameters, terminal roles, fixed-output design constraints, thermal resistance values, and real-world use context for embedded power rail selection.
Technical Context
The AP1115BY33L-13 operates in fixed 3.3V mode with internal reference and error amplifier driving a PNP pass transistor. Its dropout voltage remains ≤1.3V across 0–0.6A load at junction temperatures up to +125°C, enabling regulation from as low as 4.8V input.
It features fast transient response (≤100µs settling time), built-in current limiting (~0.7A trip), and thermal shutdown activation at +150°C junction temperature. Ripple rejection is specified at 60–70dB with 25µF tantalum output capacitor and 120Hz input ripple.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | 3.300V ±3% at 10mA, 4.8–12V input - ensures compatibility with 3.3V logic families under nominal load |
| Dropout Voltage | 1.1V typical / 1.3V max at 0.6A - enables operation from 4.8V input while maintaining regulation |
| Ripple Rejection | 60–70dB at 120Hz with 25µF tantalum Cout - suppresses switching noise from upstream DC/DC converters |
| Load Regulation | 26–33mV over 0–0.6A load - maintains <1% output deviation across full current range |
| Thermal Resistance θJA | 164°C/W (no heatsink, FR-4, 2oz Cu) - limits power dissipation to ~5W max before thermal shutdown |
| Quiescent Current | 5–10mA minimum load required - defines lowest usable output current without regulation loss |
| Line Regulation | 0.2% over VIN = VOUT+1.5V to 15V - ensures stability against input supply variation |
Pinout & Package
SOT89-3L package with exposed tab connected to VIN (Pin 2 per AP1115B variant); thermally enhanced plastic surface-mount outline measuring 4.5mm × 2.5mm × 1.5mm (max height), RoHS-compliant and halogen-free.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Adj (GND) | Reference node / ground return | Internally tied to GND in fixed-mode variants like AP1115BY33L-13 - serves as feedback reference point |
| Pin 2: VIN | Input supply connection | Primary power entry; must be ≥1.3V above VOUT to sustain regulation; tab is electrically connected to this pin |
| Pin 3: VOUT | Regulated output terminal | Delivers stable 3.3V; requires ≥10µF output capacitor (ESR 0.15–20Ω) for loop stability |
Key Features
| Feature | Design Value |
|---|---|
| Fixed 3.3V output | Eliminates external resistor divider - reduces BOM count and layout sensitivity in space-constrained designs |
| Fast transient response | Sub-100µs recovery from 50% load step - supports dynamic logic loads without undershoot exceeding 50mV |
| Built-in thermal shutdown | Activates at +150°C junction temperature - prevents catastrophic failure during sustained overload or poor PCB thermal design |
| Lead-free & green packaging | SOT89-3L meets RoHS 2 and halogen/antimony-free requirements (<900ppm Br/Cl, <1000ppm Sb) - compliant for global industrial shipments |
| Low-noise regulation | 60–70dB ripple rejection at 120Hz - suitable for noise-sensitive analog subsystems powered from same rail |
Applications
| PC Peripheral Power | VGA Card Core Supply |
|---|---|
|
Use Scenario: Providing clean 3.3V rail to USB hub controllers, SATA bridge ICs, and PCIe endpoint regulators on add-in cards. IC Role / Device Role / Timing Role: Primary LDO for powering digital I/O interfaces and configuration logic requiring tight voltage tolerance. Use Value: Maintains <±3% output accuracy across 0–0.6A load and 0–125°C junction temperature - ensures reliable enumeration and link training. |
Use Scenario: Delivering stable 3.3V to GPU memory interface buffers and display controller I/O banks on discrete graphics cards. IC Role / Device Role / Timing Role: Fixed-output LDO supplying termination voltage and core logic for high-speed video data paths. Use Value: 1.3V dropout allows direct derivation from 5V rail - avoids need for intermediate buck conversion and associated EMI. |
| High-Speed Bus Termination | Low-Power Embedded Logic |
|
Use Scenario: Biasing parallel termination resistors on DDR2/DDR3 address/control buses where precise 3.3V reference is required. IC Role / Device Role / Timing Role: Precision voltage source for VTT termination networks - directly referenced by bus drivers and receivers. Use Value: 0.2% line regulation and <33mV load regulation minimize timing skew caused by supply-induced threshold shifts. |
Use Scenario: Powering microcontroller peripherals (UART, SPI, GPIO) and sensor signal chains in battery-backed industrial modules. IC Role / Device Role / Timing Role: Standby-capable LDO providing always-on 3.3V domain with minimal quiescent current impact. Use Value: 5–10mA minimum load requirement aligns with typical MCU sleep-mode current - avoids regulation collapse during deep-sleep states. |
Availability
AP1115BY33L-13 is available at Aetrix Electronics and suitable for PC peripheral power, VGA card core supply, high-speed bus termination, and low-power embedded logic applications requiring stable component supply despite end-of-life status.
Supply support for AP1115BY33L-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
Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design centers across Asia and manufacturing in China, Malaysia, and Taiwan.
The AP1115 series belongs to Diodes' precision linear regulator product line, engineered for cost-sensitive, thermally constrained applications demanding low dropout, fast transient response, and robust thermal protection in compact packages.
FAQ
Is AP1115BY33L-13 still in active production?
No - Diodes Incorporated officially discontinued the AP1115 family as of April 2016 (DS31026 Rev. 6-4). The part is obsolete with no direct replacement offered by the manufacturer. Aetrix Electronics maintains limited legacy stock for design continuity and repair programs.
What is the difference between AP1115A and AP1115B pinouts?
AP1115B (used in AP1115BY33L-13) has Pin 1 = Adj(GND), Pin 2 = VIN (tab-connected), Pin 3 = VOUT. AP1115A swaps Pin 1 and Pin 3: Pin 1 = VOUT, Pin 2 = Adj(GND), Pin 3 = VIN. This affects PCB layout and thermal path - VIN-tab connection in B-version improves heat transfer to copper pour.
Can AP1115BY33L-13 be used with ceramic output capacitors?
Yes, but only if ESR is ≥0.15Ω. The AP1115 requires minimum ESR for loop stability; standard X7R/X5R ceramics typically fall below 0.05Ω. A 10µF ceramic with added 0.22Ω series resistor or use of specialty high-ESR ceramics (e.g., Z5U) satisfies the stability condition per datasheet Note 4.
What is the maximum safe input voltage for AP1115BY33L-13?
The absolute maximum VIN is +18V, but recommended operating range is 4.8V to 12V for 3.3V output. At 18V input with 0.6A load, power dissipation exceeds 8.8W - exceeding the 5W thermal limit even with ideal heatsinking. Derating is mandatory above 12V input.
AP1115BY33L-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- 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 @ 600mA
- Current - Output:
- 600mA
- Current - Quiescent (Iq):
- 10 mA
- Current - Supply (Max):
- -
- PSRR:
- 60dB (120Hz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- 0°C ~ 125°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-89-3
AP1115BY33L-13 FAQ
1.How can I place an order for AP1115BY33L-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1115BY33L-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 AP1115BY33L-13 reliable?
The price and inventory of AP1115BY33L-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1115BY33L-13 is usually 5 days.
3.What payment methods are accepted for AP1115BY33L-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1115BY33L-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1115BY33L-13?
AP1115BY33L-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1115BY33L-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 AP1115BY33L-13?
For technical support, including AP1115BY33L-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1115BY33L-13 requirements.
6.How does Aetrix verify that AP1115BY33L-13 is sourced from the original manufacturer or authorized distributors?
All AP1115BY33L-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 AP1115BY33L-13 meets industry standards.
7.What is the process for return or replacement of AP1115BY33L-13?
All AP1115BY33L-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1115BY33L-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 AP1115BY33L-13 part is unused and in its original packaging.
Return procedure for AP1115BY33L-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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