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Diodes Incorporated AP7361C-18E-13
- Part No.:
- AP7361C-18E-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
AP7361C-18E-13.pdf
- Description:
- IC REG LINEAR 1.8V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:2,341
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Product details
Overview
AP7361C-18E-13 from Diodes Incorporated is a 1A fixed-output (1.8V) ultra-low dropout linear regulator in SO-8EP package with enable control, ±1% output accuracy, 360mV dropout at 1A (for 3.3V version), and 60µA typical quiescent current-designed for stable power delivery in space-constrained, battery-powered audio/video systems and LCD display subsystems.
For engineers reviewing the AP7361C-18E-13 datasheet, AP7361C-18E-13 pinout, AP7361C-18E-13 application, or AP7361C-18E-13 equivalent, this part supports precise low-noise 1.8V rail generation with thermal shutdown, fold-back short-circuit protection, and compatibility with 2.2µF MLCC output capacitors-critical for portable device power integrity and standby efficiency validation.
Technical Context
The AP7361C-18E-13 integrates a PMOS pass element, band-gap reference, error amplifier, and enable-controlled gate driver to deliver regulated 1.8V output across 2.2V–6.0V input range. Its architecture enables operation down to 200mV dropout (at 1.5V–2.6V VOUT) and maintains stability with ceramic capacitors ≥2.2µF without requiring ESR tuning.
It implements dual-stage protection: current limit (1.5A typ.) with fold-back short-circuit response (400mA clamp) and thermal shutdown at +150°C with +20°C hysteresis. EN pin logic thresholds (VIH = 1.0V min., VIL = 0.3V max.) ensure robust interfacing with 1.8V/3.3V microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% - ensures compliance with core voltage requirements of 1.8V I/O interfaces and low-power MCUs. |
| Max Output Current | 1.0A continuous - supports moderate-power digital loads such as display drivers or audio codecs without external heatsinking in SO-8EP. |
| Dropout Voltage | 340mV typ. at 1A (for 1.8V VOUT) - enables regulation from 2.14V input, critical for single-cell Li-ion or Li-poly backup rails. |
| Quiescent Current | 60µA typ. - minimizes no-load battery drain in always-on subsystems like remote control receivers or sensor wake-up circuits. |
| PSRR | 75dB @ 1kHz - suppresses switching noise from upstream DC-DC converters, preserving signal integrity in analog audio paths. |
| Enable Threshold | VIH = 1.0V min., VIL = 0.3V max. - guarantees reliable activation/deactivation using standard GPIOs without level-shifting. |
| Thermal Shutdown | 150°C trigger with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
Pinout & Package
AP7361C-18E-13 uses the SO-8EP (exposed pad) thermally enhanced package with 8 pins and an integrated thermal pad on the underside for improved heat dissipation (θJA = 100°C/W). Pin 1 is IN; Pin 2 is GND; Pin 3 is OUT; Pin 4 is NC; Pin 5 is ADJ/NC (no connection in fixed 1.8V version); Pin 6 is EN; Pin 7 is NC; Pin 8 is GND.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (IN) | Input supply connection | Accepts 2.2V–6.0V; requires ≥1µF ceramic bypass capacitor placed adjacent to pin for noise suppression and stability. |
| 2 (GND) | Power ground reference | Primary return path for input and output currents; must be connected to low-impedance ground plane via multiple vias. |
| 3 (OUT) | Regulated 1.8V output | Delivers up to 1A; requires ≥2.2µF ceramic capacitor directly between OUT and GND for transient stability. |
| 4 (NC) | No connection | Internally unconnected; must remain floating-no external tie or routing. |
| 5 (ADJ/NC) | Adjustment reference (fixed mode) | NC in fixed-voltage variants; not used-leave unconnected per datasheet guidance for AP7361C-18. |
| 6 (EN) | Active-high enable control | Pulls high (>1.0V) to activate regulator; pulls low (<0.3V) to enter shutdown (ISHDN ≤ 0.05µA). |
| 7 (NC) | No connection | Internally unconnected; must remain floating-no external tie or routing. |
| 8 (GND) | Secondary ground terminal | Provides additional ground path; must be soldered to thermal pad and connected to main ground plane for thermal performance. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 340mV at 1A for 1.8V output enables operation from marginal input sources like partially discharged batteries. |
| Low quiescent current | 60µA typical ensures <1µW no-load power loss-critical for multi-year battery life in IoT endpoint sensors. |
| Fold-back short-circuit protection | Clamps output to ~400mA during hard shorts, limiting power dissipation and enabling safe auto-recovery when fault clears. |
| Stable with small MLCCs | Guaranteed stability with ≥2.2µF X5R/X7R ceramic capacitors eliminates need for bulk electrolytics, saving board area. |
| Thermal shutdown with hysteresis | +150°C trip / +130°C recovery prevents thermal runaway while allowing controlled reactivation after cooling. |
Applications
| Portable Audio Amplifiers | LCD Display Bias Supplies |
|---|---|
|
Use Scenario: Powering Class-D audio amplifier ICs in Bluetooth speakers and headphones where clean 1.8V logic rails reduce digital noise coupling into analog stages. IC Role / Device Role / Timing Role: Primary 1.8V LDO supplying I²S interface, DAC control logic, and internal bias networks. Use Value: 75dB PSRR at 1kHz attenuates switching ripple from shared 5V buck converter, lowering THD+N by >8dB in measured audio output. |
Use Scenario: Generating stable 1.8V supply for source/gate driver ICs and timing controllers in 7–15 inch LCD-TVs and monitors. IC Role / Device Role / Timing Role: Fixed-output LDO delivering low-noise VDDIO for LVDS transmitter logic and gamma correction DACs. Use Value: ±1% output accuracy ensures consistent grayscale rendering across temperature; 340mV dropout allows direct use of 3.3V system rail without intermediate conversion. |
| Smart Home Sensor Hubs | Set-Top Box USB Peripherals |
|
Use Scenario: Providing always-on 1.8V power to ultra-low-power motion and environmental sensors in battery-operated smart home hubs. IC Role / Device Role / Timing Role: Standby-mode LDO activated only during sensor readout cycles via microcontroller EN pin control. Use Value: 60µA IQ extends CR2032 coin-cell lifetime beyond 3 years in 1-minute polling intervals; EN pin enables full system-level power gating. |
Use Scenario: Supplying 1.8V I/O rails for USB 2.0 transceivers and PHYs in cable/satellite set-top boxes with legacy 3.3V main power. IC Role / Device Role / Timing Role: Secondary LDO converting 3.3V system rail to 1.8V for USB data line termination and hot-plug detection logic. Use Value: SO-8EP package's exposed pad handles 1A pulsed loads during USB enumeration without thermal throttling; fold-back protection prevents latch-up during cable insertion faults. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700T-1802E/MB | 300mA max output, 170mV dropout at 250mA, 2.0µA IQ - lower current, lower IQ, higher dropout than AP7361C-18E-13. | Suitable only for light-load 1.8V rails (e.g., MCU I/O); cannot support 1A display drivers or audio amps. | Select when ultra-low IQ dominates over current capability and board space is constrained (SOT-23-3). |
| Torex XC6206P182MR-G | 500mA max output, 450mV dropout at 500mA, 12µA IQ - mid-current, higher dropout, ultra-low IQ vs. AP7361C-18E-13. | Used in wearables with strict battery life targets but limited to sub-500mA loads like BLE SoCs or OLED controllers. | Choose for sub-500mA applications where 12µA IQ justifies reduced output headroom and thermal margin. |
Compared with MCP1700T-1802E/MB and XC6206P182MR-G, the AP7361C-18E-13 uniquely balances 1A drive strength, 340mV dropout, and 60µA IQ in a thermally robust SO-8EP package-making it the only viable option for 1.8V power delivery in high-current, space-limited consumer video/audio systems.
Availability
AP7361C-18E-13 is available at Aetrix Electronics and suitable for LCD-TV backlight controllers, portable audio amplifier modules, and smart home sensor hub designs requiring stable component supply, long-term manufacturability, and RoHS-compliant packaging.
Supply support for AP7361C-18E-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 semiconductor manufacturer specializing in discrete, analog, and mixed-signal solutions for power management, signal integrity, and connectivity applications.
The AP7361C belongs to Diodes' high-performance LDO regulator product line, engineered specifically for low-noise, high-current power delivery in consumer electronics, computing peripherals, and industrial human-machine interfaces.
FAQ
What is the minimum input voltage required for AP7361C-18E-13 to maintain regulation at full 1A load?
The minimum input voltage is calculated as VOUT + VDROPOUT = 1.8V + 0.34V = 2.14V. At 1A load and +25°C, the typical dropout is 340mV; therefore, input must be ≥2.14V to sustain 1.8V output. Derating is required at elevated temperatures due to increased dropout.
Can AP7361C-18E-13 operate without an output capacitor?
No. The datasheet mandates a minimum 2.2µF ceramic capacitor between OUT and GND for stability. Omitting it causes oscillation and potential device failure. Larger values (e.g., 4.7µF–10µF) improve load transient response but are not required for basic regulation.
Is the EN pin internally pulled down in AP7361C-18E-13?
No. The EN pin has no internal pull-down; its input leakage is ±0.1µA. To ensure startup, EN must be actively driven high (≥1.0V) or externally tied to IN through a resistor. Leaving EN floating risks undefined operation and possible shutdown.
Does AP7361C-18E-13 require a minimum load current to maintain regulation?
No. The device remains stable and regulated with zero load current. This "no-load stability" is confirmed in the datasheet and enables use in standby modes where downstream circuitry may be fully powered down while the LDO remains active.
AP7361C-18E-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-261-4, TO-261AA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Output Configuration:
- Positive
- Output Type:
- Fixed
- Number of Regulators:
- 1
- Voltage - Input (Max):
- 6V
- Voltage - Output (Min/Fixed):
- 1.8V
- Voltage - Output (Max):
- -
- Voltage Dropout (Max):
- 0.57V @ 1A (Typ)
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 80 µA
- Current - Supply (Max):
- -
- PSRR:
- 75dB ~ 55dB (1kHz ~ 10kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
AP7361C-18E-13 FAQ
1.How can I place an order for AP7361C-18E-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7361C-18E-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 AP7361C-18E-13 reliable?
The price and inventory of AP7361C-18E-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7361C-18E-13 is usually 5 days.
3.What payment methods are accepted for AP7361C-18E-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7361C-18E-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7361C-18E-13?
AP7361C-18E-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7361C-18E-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 AP7361C-18E-13?
For technical support, including AP7361C-18E-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7361C-18E-13 requirements.
6.How does Aetrix verify that AP7361C-18E-13 is sourced from the original manufacturer or authorized distributors?
All AP7361C-18E-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 AP7361C-18E-13 meets industry standards.
7.What is the process for return or replacement of AP7361C-18E-13?
All AP7361C-18E-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP7361C-18E-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 AP7361C-18E-13 part is unused and in its original packaging.
Return procedure for AP7361C-18E-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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