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Diodes Incorporated AP7361-18E-13
- Part No.:
- AP7361-18E-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
AP7361-18E-13.pdf
- Description:
- IC REG LINEAR 1.8V 1A SOT223
- Quantity:
- Payment:
- Shipping:
Inventory:1,576
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Product details
Overview
AP7361-18E-13 from Diodes Incorporated is a 1A fixed-output (1.8V) ultra-low dropout linear regulator in SOT223 package with enable control, 70µA typical quiescent current, 500mV dropout at 1A load, and thermal shutdown/current limit protection. It powers FPGA I/O rails, laptop subsystems, and battery-powered audio devices requiring stable low-voltage bias.
For engineers reviewing the AP7361-18E-13 datasheet, AP7361-18E-13 pinout, AP7361-18E-13 application, or AP7361-18E-13 equivalent, key selection criteria include dropout voltage at full load, EN pin logic thresholds, thermal resistance (110°C/W), ceramic capacitor stability (≥2.2µF), and fixed 1.8V output accuracy (±1% at 100mA).
Technical Context
The AP7361-18E-13 integrates a PMOS pass element, 0.8V bandgap reference, and error amplifier to regulate output with ±1% accuracy across -40°C to +85°C ambient. Its enable circuitry requires VIH ≥1.0V and VIL ≤0.3V for reliable ON/OFF control.
Thermal shutdown activates at 150°C junction temperature with 20°C hysteresis, while current limiting clamps output to 1.1–1.5A under overload. PSRR reaches 65dB at 1kHz and 45dB at 10kHz, supporting noise-sensitive analog loads.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% at 100mA, ±2% over full temperature range - ensures stable core logic supply for 1.8V I/O interfaces. |
| Dropout Voltage | 500mV at 1A load - enables operation from 2.3V input, critical for single-cell Li-ion or Li-poly backup systems. |
| Quiescent Current | 70µA typical - minimizes standby power loss in always-on subsystems like real-time clocks or sensor wake-up circuits. |
| Input Voltage Range | 2.2V to 6.0V - supports wide-input applications including USB-powered peripherals and multi-rail embedded systems. |
| Thermal Resistance θJA | 110°C/W (SOT223) - defines maximum power dissipation (1.1W at 25°C ambient) before thermal shutdown triggers. |
| PSRR | 65dB @ 1kHz - suppresses switching noise from upstream DC/DC converters feeding the LDO input. |
| Output Capacitor | Stable with ≥2.2µF ceramic (10–300mΩ ESR) - eliminates need for bulky tantalum or electrolytic capacitors. |
Pinout & Package
SOT223 package (3-pin variant with exposed thermal pad) provides low thermal resistance (110°C/W) and compact footprint for space-constrained PCB layouts. Pin 1 = IN, Pin 2 = GND, Pin 3 = OUT.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN (Pin 1) | Regulator input | Accepts 2.2–6.0V; requires ≥1µF ceramic bypass to GND placed adjacent to pin for noise immunity. |
| GND (Pin 2) | Power ground reference | Common return path for input/output currents; must connect to low-impedance ground plane via thermal pad. |
| OUT (Pin 3) | Regulated output | Delivers 1.8V ±1%; requires ≥2.2µF ceramic capacitor to GND for transient stability and PSRR optimization. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 500mV at 1A load enables use with input as low as 2.3V - extends battery runtime in portable 1.8V systems. |
| Enable control | Active-high EN pin (VIH ≥1.0V) allows precise power sequencing in multi-rail designs without external logic. |
| Thermal shutdown | 150°C trip with 20°C hysteresis prevents permanent damage during sustained overload or poor heatsinking. |
| Ceramic capacitor stability | Guaranteed stable with ≥2.2µF X5R/X7R ceramic (10–300mΩ ESR) - reduces BOM cost and board area vs. tantalum. |
| High PSRR | 65dB at 1kHz suppresses ripple from noisy switchers - critical for ADC references and RF bias supplies. |
Applications
| FPGA I/O Power | Laptop Subsystem Bias |
|---|---|
Use Scenario: Supplying 1.8V I/O banks on Xilinx Artix-7 or Intel Cyclone V FPGAs during configuration and operation. IC Role / Device Role / Timing Role: Primary low-noise post-regulator delivering clean 1.8V to high-speed transceivers and memory interfaces. Use Value: 65dB PSRR at 1kHz prevents digital switching noise from corrupting signal integrity on 1.8V LVDS or SSTL buses. |
Use Scenario: Powering USB 3.0 controller, display interface, or touchpad MCU in ultrabook mainboard designs. IC Role / Device Role / Timing Role: Secondary LDO providing regulated 1.8V from 3.3V or 5V intermediate rail with fast transient response. Use Value: 200µs startup time enables rapid wake-from-sleep transitions, meeting Intel Modern Standby timing requirements. |
| Battery-Powered Audio | Industrial Sensor Node |
Use Scenario: Biasing MEMS microphones, audio codecs, and Class-D amplifier inputs in Bluetooth earbuds or portable speakers. IC Role / Device Role / Timing Role: Low-quiescent-current (70µA) regulator maintaining 1.8V supply during extended standby modes. Use Value: Enables >300-hour shelf life on coin-cell batteries by minimizing no-load current drain. |
Use Scenario: Powering 1.8V precision ADCs, temperature sensors, and LoRaWAN transceivers in remote environmental monitors. IC Role / Device Role / Timing Role: Fault-tolerant local regulator with current limit and thermal shutdown protecting against field wiring faults. Use Value: Built-in 1.1–1.5A current limit prevents catastrophic failure when sensor cables short in harsh industrial environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1700-1802E/TO | 300mA output, 170mV dropout at 250mA, 2.0µA IQ - lower current, much lower quiescent current. | Only suitable for <300mA loads; insufficient for FPGA I/O or audio amplifiers requiring 1A. | Select only for ultra-low-power sensor nodes where 1A capability is unnecessary. |
| TLS850B2TE/V1 | 500mA output, 200mV dropout at 250mA, integrated watchdog and reset - automotive AEC-Q100 qualified. | Designed for automotive body electronics; lacks enable pin and has higher minimum input (3.0V). | Choose only for automotive-grade 1.8V bias where qualification and system monitoring are mandatory. |
Compared with MCP1700-1802E/TO and TLS850B2TE/V1, the AP7361-18E-13 uniquely delivers 1A output at 1.8V with 500mV dropout and 70µA IQ in an industrial-qualified SOT223 package - balancing performance, thermal robustness, and cost for high-volume consumer and industrial applications.
Availability
AP7361-18E-13 is available at Aetrix Electronics and suitable for FPGA power delivery, laptop subsystem bias, and battery-powered audio requiring stable component supply with consistent parametric performance and long-term manufacturability.
Supply support for AP7361-18E-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 AP7361 belongs to Diodes' high-performance LDO family designed for low-noise, low-dropout regulation in portable, computing, and industrial systems demanding tight voltage accuracy and robust fault protection.
FAQ
What is the minimum input voltage required for AP7361-18E-13 to maintain regulation at 1A load?
The minimum input voltage is 2.3V, calculated as VOUT + VDROPOUT = 1.8V + 0.5V. Below this, output voltage drops below specification. The device's absolute maximum input is 6.5V, and recommended operating range is 2.2V–6.0V per datasheet Section 5.
Can AP7361-18E-13 be used without an enable signal?
Yes - tie the EN pin directly to IN to force permanent enable. The EN pin is not present in SOT223 package variants; AP7361-18E-13 uses SOT223, so EN functionality is unavailable. This part operates continuously once powered.
Is a minimum load required for stability with AP7361-18E-13?
No minimum load is required. The device remains stable and regulated down to zero load current, as confirmed in Section 12 of the datasheet. Output capacitor requirements (≥2.2µF ceramic) alone ensure stability across all operating conditions.
How does thermal shutdown behave under continuous overload?
At ~150°C junction temperature, output disables; it re-enables automatically at ~130°C. Under sustained overload, this causes thermal cycling - visible as intermittent output. To avoid this, ensure θJA × PD + TA ≤ 150°C, where PD = (VIN − 1.8V) × IOUT.
AP7361-18E-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):
- 0.7V @ 1A
- Current - Output:
- 1A
- Current - Quiescent (Iq):
- 90 µA
- Current - Supply (Max):
- -
- PSRR:
- 65dB ~ 45dB (1kHz ~ 10kHz)
- Control Features:
- -
- Protection Features:
- Over Current, Over Temperature, Short Circuit
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- SOT-223-3
AP7361-18E-13 FAQ
1.How can I place an order for AP7361-18E-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7361-18E-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 AP7361-18E-13 reliable?
The price and inventory of AP7361-18E-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7361-18E-13 is usually 5 days.
3.What payment methods are accepted for AP7361-18E-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7361-18E-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7361-18E-13?
AP7361-18E-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7361-18E-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 AP7361-18E-13?
For technical support, including AP7361-18E-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7361-18E-13 requirements.
6.How does Aetrix verify that AP7361-18E-13 is sourced from the original manufacturer or authorized distributors?
All AP7361-18E-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 AP7361-18E-13 meets industry standards.
7.What is the process for return or replacement of AP7361-18E-13?
All AP7361-18E-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP7361-18E-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 AP7361-18E-13 part is unused and in its original packaging.
Return procedure for AP7361-18E-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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