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Diodes Incorporated AP1115BYL-13
- Part No.:
- AP1115BYL-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-243AA
- Datasheet:
-
AP1115BYL-13.pdf
- Description:
- IC REG LDO 0.6A ADJ SOT89-3
- Quantity:
- Payment:
- Shipping:
Inventory:1,979
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Product details
Overview
AP1115BYL-13 from Diodes Incorporated is a 0.6A low-dropout positive voltage regulator in SOT89-3L package, configurable as fixed-output (3.3V) or adjustable-mode via external resistor divider. It delivers <1.3V dropout at full load, supports 1.25–5V output range with up to 18V input, and is designed for stable low-voltage IC supply in VGA cards, PC peripherals, and high-speed bus termination.
For engineers reviewing the AP1115BYL-13 datasheet, AP1115BYL-13 pinout, AP1115BYL-13 application, or AP1115BYL-13 equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, and confirmed alternative options for fixed 3.3V LDO replacement scenarios.
Technical Context
The AP1115BYL-13 implements a PNP-based linear regulation architecture with internal current limiting and thermal shutdown. Its fixed 3.3V output version (denoted by "33" in ordering code) eliminates external feedback resistors, simplifying layout for space-constrained applications requiring precise 3.3V rail stability under dynamic loads.
It achieves fast transient response through optimized internal compensation and requires only 100µF output capacitance (ESR 0.15–20Ω) for stability. Input must remain ≥1.3V above VOUT to maintain regulation - a constraint critical for 5V-to-3.3V conversion with marginal headroom.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 3.300 V ±3% at 10mA, 4.8–12V input; ensures compatibility with standard 3.3V logic families. |
| Dropout Voltage | 1.1 V typical / 1.3 V max at 0.6A load; enables operation from 4.6V minimum input in 3.3V systems. |
| Output Current | 0.6 A continuous; sufficient for powering multiple low-power ICs on a single rail (e.g., USB PHY, SMBus controllers). |
| Ripple Rejection | 60 dB min at 120 Hz with 25µF tantalum output cap; suppresses switching noise from upstream DC/DC converters. |
| Thermal Resistance | θJA = 164°C/W (no heatsink); limits max ambient temperature to ~75°C at full load with standard FR-4 PCB layout. |
| Load Regulation | 26–33 mV over 0–0.6A load range; maintains tight voltage tolerance during processor I/O activity bursts. |
| Quiescent Current | 5–10 mA minimum load required; prevents regulation loss when downstream circuitry enters deep sleep. |
Pinout & Package
SOT89-3L package with exposed tab (Pin 3), RoHS-compliant and halogen-free ("Green"). Tab is electrically connected to VIN for AP1115B variant - critical for thermal path and PCB copper pour design.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1: Adj (GND) | Reference node / ground return | Internally tied to GND in fixed-mode; serves as feedback reference point - must be low-impedance connection to system ground plane. |
| Pin 2: VIN | Input supply terminal | Accepts 4.8–18V DC; requires ≥100µF bulk capacitor with ESR 0.15–20Ω to prevent sag during 0.6A transients. |
| Pin 3: VOUT | Regulated output terminal | Delivers stable 3.3V; connects directly to load and 100µF output capacitor - trace length must be minimized to reduce inductance. |
Key Features
| Feature | Design Value |
|---|---|
| Fast transient response | Sub-100 µs recovery from 50% load step; maintains signal integrity in burst-mode digital interfaces (e.g., PCIe AUX channel). |
| Built-in thermal shutdown | Triggers at TJ ≥150°C and auto-recovers after cooldown; prevents permanent damage during sustained overload or poor heatsinking. |
| Output current limiting | 700 mA min trip threshold; protects both regulator and downstream circuits during short-circuit or inrush events. |
| Low-noise regulation | 60–70 dB ripple rejection at 120 Hz; enables clean power for analog front-ends and clock buffers without additional filtering. |
| Adjustable/fixed dual mode | Same die supports fixed 3.3V (AP1115B-33) or adjustable output (AP1115A-ADJ); reduces BOM count across product variants. |
Applications
| VGA Graphics Card Power | PCI Express Peripheral Supply |
|---|---|
|
Use Scenario: Providing dedicated 3.3V rail for VGA DAC, memory interface, and display controller logic. IC Role / Device Role / Timing Role: Primary low-noise post-regulator converting 5V or 12V system rail to stable 3.3V for analog/digital mixed-signal blocks. Use Value: 1.3V dropout allows use with legacy 5V-only power supplies; 60 dB ripple rejection prevents color banding artifacts. |
Use Scenario: Supplying 3.3V to PCIe slot detection, hot-plug controllers, and sideband signal buffers. IC Role / Device Role / Timing Role: Local point-of-load regulator ensuring voltage stability during hot-insertion transients and link training sequences. Use Value: Fast transient response (<100 µs) prevents false slot detect errors; 0.6A rating covers worst-case AUX power draw. |
| Industrial PC Peripheral Interface | Embedded Communication Module Rail |
|
Use Scenario: Powering RS-485 transceivers, CAN controllers, and isolated I²C level shifters in ruggedized IPCs. IC Role / Device Role / Timing Role: Isolated secondary-side regulator delivering noise-immune 3.3V from isolated DC/DC output. Use Value: Thermal shutdown and current limit protect against field wiring faults; SOT89-3L footprint fits dense backplane layouts. |
Use Scenario: Generating 3.3V for LTE/Wi-Fi module baseband processors and RF front-end bias rails. IC Role / Device Role / Timing Role: Low-ESR-capacitor-compatible LDO supplying clean power during RF transmit bursts. Use Value: 100µF output cap requirement matches standard ceramic/tantalum hybrid designs; 33 mV load regulation avoids modem reset. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed 3.3V LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-3302E/TT | 0.25A max output, 170 mV dropout at 250mA; smaller SOT23-3 package | Limited to ultra-low-power peripherals (e.g., sensors, EEPROMs); insufficient for VGA or PCIe loads | Select only if load ≤250mA and board space is constrained - not a functional replacement for 0.6A use cases. |
| SPX3819M5-L-3-3 | 0.5A output, 340 mV dropout at 500mA; requires 2.2µF ceramic output cap | Better efficiency in low-headroom 3.6V→3.3V applications; lacks thermal shutdown flag output | Prefer for battery-powered devices needing lower dropout; verify thermal performance at 0.6A with PCB copper area. |
Compared with AP1115BYL-13, MCP1700T-3302E/TT trades output current for size, while SPX3819M5-L-3-3 improves dropout but reduces fault protection coverage - neither replicates the 0.6A/1.3V-dropout/thermal-shutdown combination in SOT89-3L.
Availability
AP1115BYL-13 is available at Aetrix Electronics and suitable for VGA graphics card power, PCIe peripheral supply, and industrial PC peripheral interface applications requiring stable component supply despite end-of-life status.
Supply support for AP1115BYL-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, specializing in high-reliability power management, signal integrity, and protection solutions for industrial and computing markets.
The AP1115 belongs to Diodes' legacy LDO regulator product line, engineered for cost-sensitive, space-constrained applications demanding robust thermal behavior and predictable dropout performance in fixed-voltage configurations.
FAQ
Is AP1115BYL-13 still in active production?
No - Diodes Incorporated officially discontinued the AP1115 family in April 2016 (DS31026 Rev. 6-4). Aetrix Electronics maintains limited legacy stock with full traceability and offers engineering support for last-time buy and obsolescence mitigation planning.
What is the difference between AP1115A and AP1115B pinouts?
AP1115A has Pin 1 = VOUT, Pin 2 = Adj(GND), Pin 3 = VIN; AP1115B reverses Pins 1 and 2: Pin 1 = Adj(GND), Pin 2 = VIN, Pin 3 = VOUT. AP1115BYL-13 uses the B variant, where the tab (Pin 3) connects to VOUT - critical for thermal pad routing.
Can AP1115BYL-13 be used with ceramic output capacitors?
The datasheet specifies 100µF tantalum (ESR 0.15–20Ω) for stability. Ceramic caps have near-zero ESR and may cause oscillation. If using ceramics, add a 1Ω damping resistor in series with the cap or select a ≥100mΩ ESR ceramic polymer variant per Diodes' AP02001 layout guidance.
Does AP1115BYL-13 support reverse polarity protection?
No - the device lacks internal reverse-battery protection. Applying reversed input voltage will forward-bias the substrate diode between VIN and VOUT, potentially damaging the IC. An external series Schottky diode or PMOS FET is required for reverse-polarity resilience.
AP1115BYL-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-243AA
- Packaging:
- Cut Tape (CT)
- Product Status:
- Obsolete
- Output Configuration:
- Positive
- Output Type:
- Adjustable
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 18V
- Voltage - Output (Min/Fixed):
- 1.25V
- Voltage - Output (Max):
- 5V
- 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
AP1115BYL-13 FAQ
1.How can I place an order for AP1115BYL-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP1115BYL-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 AP1115BYL-13 reliable?
The price and inventory of AP1115BYL-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP1115BYL-13 is usually 5 days.
3.What payment methods are accepted for AP1115BYL-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP1115BYL-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP1115BYL-13?
AP1115BYL-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP1115BYL-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 AP1115BYL-13?
For technical support, including AP1115BYL-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP1115BYL-13 requirements.
6.How does Aetrix verify that AP1115BYL-13 is sourced from the original manufacturer or authorized distributors?
All AP1115BYL-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 AP1115BYL-13 meets industry standards.
7.What is the process for return or replacement of AP1115BYL-13?
All AP1115BYL-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP1115BYL-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 AP1115BYL-13 part is unused and in its original packaging.
Return procedure for AP1115BYL-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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