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Diodes Incorporated AP7361C-18DR-13
- Part No.:
- AP7361C-18DR-13
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- Datasheet:
-
AP7361C-18DR-13.pdf
- Description:
- IC REG LINEAR 1.8V 1A TO252
- Quantity:
- Payment:
- Shipping:
Inventory:1,454
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Product details
Overview
AP7361C-18DR-13 from Diodes Incorporated is a 1A fixed-output (1.8V) ultra-low dropout linear regulator with enable, designed for power rail regulation in space-constrained portable and battery-powered systems. It delivers ±1% output accuracy, 360mV dropout at 1A (for 3.3V variant; 1.8V dropout is 440mV typ), 60µA quiescent current, and integrates thermal shutdown, fold-back short-circuit protection (400mA), and current limit (1.5A). It is used in LCD-TV power supplies and set-top-box core logic rails.
For engineers reviewing the AP7361C-18DR-13 datasheet, AP7361C-18DR-13 pinout, AP7361C-18DR-13 application, or AP7361C-18DR-13 equivalent, key selection criteria include dropout voltage at 1.8V output, EN pin logic thresholds (VIH = 1.0V min), thermal resistance of TO252-R package (95°C/W), stability with ≥2.2µF MLCC output capacitors, and compatibility with 2.2–6.0V input sources.
Technical Context
The AP7361C-18DR-13 implements a PMOS pass transistor architecture enabling ultra-low dropout and high PSRR (75dB @ 1kHz). Its internal 0.8V bandgap reference feeds an error amplifier that regulates output via adjustable feedback (not used in fixed 1.8V version) or direct internal resistor network.
Enable control is active-high with VIH ≥ 1.0V and VIL ≤ 0.3V; EN pin includes a 3.0MΩ internal pull-down. Protection circuitry includes fold-back current limiting (triggers at ~400mA during short-circuit) and thermal shutdown at +150°C with 20°C hysteresis.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±1% - ensures stable core voltage for 1.8V I/O domains in SoCs and FPGAs. |
| Max Output Current | 1.0A continuous - supports moderate-power digital loads such as HDMI transceivers or audio codecs. |
| Dropout Voltage | 440mV typical at 1A (1.8V output) - enables operation from 2.24V input, critical for single-cell Li-ion or Li-poly backup rails. |
| Quiescent Current | 60µA typical - minimizes standby power loss in always-on subsystems like remote control receivers. |
| PSRR | 75dB @ 1kHz - suppresses switching noise from upstream DC-DC converters feeding the LDO input. |
| Thermal Shutdown | 150°C threshold with 20°C hysteresis - prevents permanent damage during sustained overload or poor PCB heatsinking. |
| Input Voltage Range | 2.2V to 6.0V - compatible with wide-input industrial supplies and multi-cell battery stacks. |
Pinout & Package
AP7361C-18DR-13 uses the TO252-R (DPAK-R) package: 3-pin variant with Pin 1 = GND, Pin 2 = OUT, Pin 3 = IN, and exposed thermal pad connected to GND. This reversed pinout improves layout symmetry in dual-rail designs and enhances thermal performance over standard TO252.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Pin 1 | GND | Power ground reference and thermal path - must be soldered to large copper pour for θJA = 95°C/W. |
| Pin 2 | OUT | Regulated 1.8V output - requires ≥2.2µF ceramic capacitor placed adjacent to pin for stability and transient response. |
| Pin 3 | IN | Unregulated input (2.2–6.0V) - needs ≥1µF ceramic bypass capacitor close to pin to suppress supply noise. |
| Exposed Pad | Thermal / GND | Internally connected to GND - mandatory for thermal management; soldering required for rated power dissipation. |
Key Features
| Feature | Design Value |
|---|---|
| Ultra-Low Dropout | 440mV at 1A (1.8V) - enables higher efficiency and longer battery runtime in low-VIN applications. |
| Low Quiescent Current | 60µA - reduces no-load power loss by >50% vs. legacy LDOs, critical for IoT sensor nodes. |
| Fold-Back Short-Circuit Protection | Clamps output to ~400mA during hard short - limits junction temperature rise and avoids thermal runaway. |
| High PSRR | 75dB @ 1kHz - maintains clean 1.8V rail despite noisy switcher inputs, improving ADC/SERDES SNR. |
| Stable with Small MLCCs | Works with ≥2.2µF X5R/X7R ceramic - eliminates need for bulky electrolytics, saving board space. |
Applications
| Set-Top Box Core Logic | LCD-TV T-Con Power |
|---|---|
Use Scenario: Powers 1.8V I/O banks of video processing SoCs in cable/satellite STBs operating from 3.3V intermediate rail. IC Role / Device Role / Timing Role: Primary post-regulator delivering clean, low-noise 1.8V for HDMI PHY and DDR interface I/O. Use Value: 75dB PSRR rejects ripple from upstream buck converter, preventing pixel jitter and color banding. |
Use Scenario: Supplies timing controller (T-Con) logic in 32–65" LCD TVs using 5V or 12V system rail. IC Role / Device Role / Timing Role: Fixed 1.8V LDO for T-Con microcontroller and LVDS transmitter core logic. Use Value: 440mV dropout allows direct regulation from 5V rail without intermediate conversion, simplifying BOM. |
| Smart Home Hub MCU Core | Portable Audio DAC Supply |
Use Scenario: Provides 1.8V core voltage to ARM Cortex-M7 MCU in Wi-Fi/Zigbee smart home hubs with battery backup. IC Role / Device Role / Timing Role: Always-on LDO maintaining MCU real-time clock and wake-up circuitry during sleep mode. Use Value: 60µA IQ extends coin-cell or supercap backup runtime beyond 12 months in deep-sleep states. |
Use Scenario: Powers stereo audio DAC in Bluetooth headphones with single-cell Li-ion (3.0–4.2V) input. IC Role / Device Role / Timing Role: Low-noise analog supply rail isolating DAC from noisy digital switching noise. Use Value: Stable 1.8V ±1% output ensures consistent DAC reference, minimizing THD+N drift across battery discharge. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fixed-output LDO regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| MCP1826S-1802E/DB | 1A, 1.8V fixed, 300mV dropout @ 1A, 90µA IQ, SOT-223 only | Lacks EN pin and fold-back protection; lower PSRR (60dB @ 1kHz) | Choose when EN control and short-circuit robustness are not required and SOT-223 footprint is preferred. |
| Torex XC6210B182MR-G | 1A, 1.8V fixed, 250mV dropout @ 1A, 45µA IQ, SOT-89-5 only | No thermal shutdown; limited to -40°C to +85°C ambient (no junction temp spec) | Prefer for ultra-low-IQ battery apps where thermal safety margin is managed externally and SOT-89-5 fits layout. |
Compared with MCP1826S-1802E/DB and XC6210B182MR-G, AP7361C-18DR-13 provides superior fault coverage (EN control, thermal shutdown, fold-back SC protection) and higher PSRR, at the cost of slightly higher dropout and IQ-making it optimal for industrial and consumer devices requiring robustness over minimal quiescent draw.
Availability
AP7361C-18DR-13 is available at Aetrix Electronics and suitable for LCD-TV power management, set-top-box core logic, and smart home hub MCU supply requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for AP7361C-18DR-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, computing, and consumer markets.
AP7361C belongs to Diodes' high-performance LDO family targeting battery-powered and space-constrained applications where ultra-low dropout, low IQ, and integrated protection are essential for system-level reliability.
FAQ
What is the minimum input voltage required for AP7361C-18DR-13 to regulate 1.8V at 1A?
The minimum input voltage is determined by dropout: 1.8V + 0.44V = 2.24V. The device operates down to 2.2V input per datasheet, but full 1A regulation at 1.8V requires VIN ≥ 2.24V. Below this, output collapses proportionally; operation below 2.2V risks undefined behavior or shutdown.
Can AP7361C-18DR-13 be used without connecting the EN pin?
No-EN functionality is disabled in TO252-R (DR) package per datasheet Section 11 ("ON/OFF Input Operation"). The EN pin is not bonded out in this variant; tying it high or low has no effect. For enable control, select U-DFN3030-8 (FGE) or SO-8EP (SP) packages instead.
Is the exposed thermal pad on AP7361C-18DR-13 electrically connected, and how must it be handled?
Yes-the exposed pad is internally connected to GND and serves as the primary thermal path. It must be soldered to a dedicated GND copper pour with ≥4 thermal vias (0.3mm diameter) to an inner-layer GND plane. Omitting this connection raises θJA to >150°C/W and risks thermal shutdown under 0.5A load.
Does AP7361C-18DR-13 require a minimum load current to maintain regulation stability?
No-stability is maintained from zero load to full 1A. The datasheet explicitly states "no minimum load is required" (Section 11). Output capacitor ≥2.2µF ceramic ensures stability across all load conditions, including idle MCU cores or powered-down peripherals.
AP7361C-18DR-13 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-252-3, DPAK (2 Leads + Tab), SC-63
- 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:
- TO-252-3
AP7361C-18DR-13 FAQ
1.How can I place an order for AP7361C-18DR-13 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7361C-18DR-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-18DR-13 reliable?
The price and inventory of AP7361C-18DR-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-18DR-13 is usually 5 days.
3.What payment methods are accepted for AP7361C-18DR-13?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7361C-18DR-13 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7361C-18DR-13?
AP7361C-18DR-13 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7361C-18DR-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-18DR-13?
For technical support, including AP7361C-18DR-13 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7361C-18DR-13 requirements.
6.How does Aetrix verify that AP7361C-18DR-13 is sourced from the original manufacturer or authorized distributors?
All AP7361C-18DR-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-18DR-13 meets industry standards.
7.What is the process for return or replacement of AP7361C-18DR-13?
All AP7361C-18DR-13 units undergo pre-shipment inspection (PSI). If there is an issue with AP7361C-18DR-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-18DR-13 part is unused and in its original packaging.
Return procedure for AP7361C-18DR-13:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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