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Diodes Incorporated AP7361-18ER-13
- Part No.:
- AP7361-18ER-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-261-4, TO-261AA
- Datasheet:
-
AP7361-18ER-13.pdf
- Description:
- IC REG LINEAR 1.8V 1A SOT223R
- Quantity:
- Payment:
- Shipping:
Inventory:3,942
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Product details
Overview
AP7361-18ER-13 from Diodes Incorporated is a 1A fixed-output (1.8V) ultra-low dropout linear regulator in SOT223R package with enable control, 70µA quiescent current, and 500mV dropout at full load-designed for FPGA I/O power, portable audio systems, and battery-powered instrumentation requiring stable low-voltage bias.
For engineers reviewing the AP7361-18ER-13 datasheet, AP7361-18ER-13 pinout, AP7361-18ER-13 application, or AP7361-18ER-13 equivalent, key selection criteria include dropout voltage at 1A, thermal shutdown threshold (150°C), EN pin logic thresholds (0.3V/1.0V), output accuracy (±1% at 100mA), and compatibility with ≥2.2µF ceramic output capacitors.
Technical Context
The AP7361-18ER-13 implements a PMOS pass transistor architecture enabling ultra-low dropout (500mV @ 1A) and fast transient response. Its internal 0.8V bandgap reference feeds an error amplifier that regulates output via feedback from the fixed 1.8V divider network embedded in the die.
Enable functionality is implemented as a CMOS-compatible active-high input (VIH = 1.0V min) directly controlling the gate driver; thermal shutdown activates at 150°C with 20°C hysteresis, and current limiting clamps output to 1.1–1.5A depending on input voltage and temperature.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% at 100mA, ±2% over -40°C to +85°C ambient - ensures stable core voltage for low-power microcontrollers and memory interfaces. |
| Dropout Voltage | 500mV max at 1A load - enables operation from 2.3V input (e.g., single Li-ion cell under discharge) while maintaining regulation. |
| Quiescent Current | 70µA typical, ≤90µA max - minimizes standby power loss in always-on sensor nodes and IoT edge devices. |
| PSRR | 65dB at 1kHz, 45dB at 10kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Thermal Shutdown | Triggers at 150°C junction temperature with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB thermal design. |
| Output Capacitor | Stable with ≥2.2µF ceramic capacitor (10–300mΩ ESR) - eliminates need for bulky tantalum or electrolytic capacitors. |
| Enable Threshold | VIL ≤ 0.3V, VIH ≥ 1.0V - compatible with 1.8V/3.3V GPIO without level-shifting. |
Pinout & Package
SOT223R package: exposed thermal pad (pin 4), 3-pin configuration with reversed pinout versus standard SOT223 (GND–OUT–IN).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND | Ground reference and thermal path | Pin 1 connects to PCB ground plane and thermal pad; must be soldered for thermal performance (θJA = 110°C/W). |
| OUT | Regulated 1.8V output | Pin 2 supplies load current up to 1A; requires ≥2.2µF ceramic capacitor placed adjacent to pin for stability. |
| IN | Input supply (2.2–6V) | Pin 3 accepts unregulated input; bypassed with ≥1µF ceramic capacitor close to pin to suppress high-frequency noise. |
| EN | Active-high enable control | Not present in SOT223R package - this variant lacks enable functionality per datasheet Pin Assignments table (EN column shows "NA" for SOT223/SOT223R). |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-low dropout | 500mV at 1A load enables use with 2.3V input sources like partially discharged Li-ion cells. |
| Low quiescent current | 70µA typical allows >1-year battery life in 10µA average-load portable instruments. |
| Thermal protection | 150°C shutdown with 20°C hysteresis prevents latch-up during intermittent overloads on compact PCBs. |
| Ceramic capacitor stability | Guaranteed stability with 2.2µF/10–300mΩ ceramic output caps reduces BOM cost and board area vs. tantalum. |
| High PSRR | 65dB at 1kHz attenuates ripple from noisy switchers, critical for ADC reference and RF subsystem power rails. |
Applications
| Battery-Powered Portable Audio | FPGA I/O Power Supply |
|---|---|
Use Scenario: Powering DACs, headphone amplifiers, and codec I/O in Bluetooth speakers and wearables. IC Role / Device Role / Timing Role: Fixed 1.8V LDO delivering clean, low-noise bias to analog signal chain components. Use Value: 65dB PSRR at 1kHz suppresses switching noise from system DC-DC, preserving SNR in 24-bit audio paths. | Use Scenario: Supplying configurable I/O banks on Xilinx Artix-7 or Intel Cyclone V FPGAs. IC Role / Device Role / Timing Role: Primary 1.8V rail generator with fast transient response to handle dynamic I/O current spikes. Use Value: 200µs start-up time and <1% load regulation support rapid FPGA configuration and partial reconfiguration. |
| Industrial Sensor Node | Smart Home Controller |
Use Scenario: Providing regulated 1.8V to ultra-low-power MCUs (e.g., STM32L4+) and MEMS sensors in wireless nodes. IC Role / Device Role / Timing Role: Always-on bias source with 70µA IQ enabling multi-year coin-cell operation. Use Value: Dropout of 500mV at 1A allows direct connection to single-cell LiFePO₄ (2.5–3.65V) without pre-regulation. | Use Scenario: Powering Wi-Fi/BLE SoCs (e.g., ESP32, nRF52840) and touch controllers in wall-mounted thermostats. IC Role / Device Role / Timing Role: Secondary LDO after main buck converter, filtering high-frequency switching noise. Use Value: Stable operation with 2.2µF ceramic cap simplifies layout and avoids ESR-related instability in space-constrained enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AP7362-18ER-13 | Same pinout and specs but with integrated soft-start (typ. 1ms); 100µA IQ vs. 70µA | Better for systems sensitive to output voltage overshoot during power-up | Select when controlled ramp-up is required; trade-off is +30µA quiescent current. |
| MCP1826-1802E/DB | 1A, 1.8V fixed, SOT223 package; 120µA IQ, 600mV dropout @ 1A, no thermal hysteresis | Lacks thermal hysteresis (latches off until cool-down), higher dropout limits low-VIN use | Choose only if thermal cycling is not expected; avoid in sealed enclosures or high-ambient environments. |
Compared with AP7361-18ER-13, AP7362-18ER-13 adds soft-start at the cost of higher IQ, while MCP1826-1802E/DB trades thermal hysteresis and dropout performance for broader vendor support - making the AP7361 optimal for thermally constrained, battery-sensitive designs requiring minimal IQ and robust fault recovery.
Availability
AP7361-18ER-13 is available at Aetrix Electronics and suitable for FPGA I/O power, portable audio systems, and industrial sensor nodes requiring stable component supply, long-lifecycle assurance, and RoHS-compliant packaging.
Supply support for AP7361-18ER-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 ICs for power management, signal integrity, and connectivity applications.
The AP7361 product line delivers high-performance, low-quiescent-current LDOs optimized for portable, battery-powered, and thermally constrained systems where ultra-low dropout and ceramic-capacitor compatibility are essential.
FAQ
Does AP7361-18ER-13 include an enable (EN) pin?
No. The SOT223R package variant (ER suffix) does not include an EN pin, as confirmed in the Pin Assignments table of DS33626 Rev. 11–3: EN is marked "NA" for both SOT223 and SOT223R packages. This variant operates continuously when powered; enable functionality is only available in U-DFN3030-8, SOT89-5, and SO-8EP packages.
What is the minimum recommended output capacitor value and type?
The AP7361-18ER-13 is stable with a minimum 2.2µF ceramic capacitor having ESR between 10mΩ and 300mΩ, as specified in the Application Information section. TDK C3216X5R1C225K085AC (2.2µF, X5R, 0805) or similar is validated for use; larger values improve transient response but are not required for stability.
Can AP7361-18ER-13 be used with a 2.3V input supply?
Yes. With a 500mV maximum dropout at 1A, the device maintains 1.8V regulation down to VIN = 2.3V (1.8V + 0.5V). This enables direct operation from a single LiFePO₄ cell (2.5–3.65V) or a partially discharged Li-ion cell (2.3V+), provided thermal design supports power dissipation: PD = (2.3V − 1.8V) × 1A = 500mW.
Is the SOT223R package thermally enhanced compared to standard SOT223?
Yes. The SOT223R package features reversed pinout (GND–OUT–IN) and an exposed thermal pad on the underside (pin 4), identical to standard SOT223's thermal design. Its θJA is 110°C/W (same as SOT223), requiring soldering of the thermal pad to a ≥1cm² copper pour with ≥4 thermal vias for rated 1A operation at +85°C ambient.
AP7361-18ER-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-223R
AP7361-18ER-13 FAQ
1.How can I place an order for AP7361-18ER-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7361-18ER-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 AP7361-18ER-13 reliable?
The price and inventory of AP7361-18ER-13 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7361-18ER-13 is usually 5 days.
3.What payment methods are accepted for AP7361-18ER-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7361-18ER-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7361-18ER-13?
AP7361-18ER-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7361-18ER-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 AP7361-18ER-13?
For technical support, including AP7361-18ER-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7361-18ER-13 requirements.
6.How does Aetrix verify that AP7361-18ER-13 is sourced from the original manufacturer or authorized distributors?
All AP7361-18ER-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 AP7361-18ER-13 meets industry standards.
7.What is the process for return or replacement of AP7361-18ER-13?
All AP7361-18ER-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP7361-18ER-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 AP7361-18ER-13 part is unused and in its original packaging.
Return procedure for AP7361-18ER-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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