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Diodes Incorporated AP7333-18SRG-7
- Part No.:
- AP7333-18SRG-7
- Manufacturer:
- Diodes Incorporated
- Package:
- TO-236-3, SC-59, SOT-23-3
- Datasheet:
-
AP7333-18SRG-7.pdf
- Description:
- IC REG LIN 1.8V 300MA SOT23R-3
- Quantity:
- Payment:
- Shipping:
Inventory:2,373
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Product details
Overview
AP7333-18SRG-7 from Diodes Incorporated is a 300mA, fixed 1.8V output, low dropout linear regulator in SOT23R package, featuring 65µA quiescent current, 300mV typical dropout at full load, and stable operation with 1µF ceramic output capacitor. It serves as a power management IC for battery-powered portable electronics requiring fast transient response and ultra-low standby power.
For engineers reviewing the AP7333-18SRG-7 datasheet, AP7333-18SRG-7 pinout, AP7333-18SRG-7 application, or AP7333-18SRG-7 equivalent, key selection criteria include dropout voltage at 300mA, PSRR at 100Hz, thermal shutdown threshold, start-up time, and compatibility with low-ESR ceramic capacitors in space-constrained designs.
Technical Context
The AP7333-18SRG-7 integrates a PMOS pass element, bandgap reference, error amplifier, and protection circuitry (current limit, short-circuit, thermal shutdown) in a single die. Its architecture enables stable regulation without minimum load and supports rapid line/load transients due to optimized internal compensation.
It operates across 2V–6V input range while maintaining ±2% output accuracy over –40°C to +85°C ambient, with 65dB PSRR at 100Hz and 80µs start-up time - characteristics critical for GSM/EDGE baseband power rails and low-power microcontroller core supplies.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Output Voltage | Fixed 1.8V ±2% - ensures precise core voltage for 1.8V logic and low-voltage I/O interfaces |
| Max Output Current | 300mA continuous - sufficient for powering ARM Cortex-M0/M3 cores, RF front-end bias, or sensor signal chains |
| Quiescent Current | 65µA typical at full load - minimizes battery drain during sleep modes in portable devices |
| Dropout Voltage | 300mV typical at 300mA - enables regulation from 2.1V input, extending usable battery life down to single-cell Li-ion or NiMH discharge curves |
| PSRR | 65dB typical at 100Hz - suppresses ripple from noisy DC-DC converters feeding intermediate supply rails |
| Start-up Time | 80µs - allows rapid wake-up from deep-sleep states without system timing violations |
| Thermal Shutdown | 140°C threshold with 15°C hysteresis - provides robust self-protection under sustained overload or poor PCB thermal design |
Pinout & Package
SOT23R package: 3-pin, RoHS-compliant, green molding compound, 230°C/W junction-to-ambient thermal resistance, footprint per Diodes Inc. AP02001 pad layout.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (Top View) | GND | Ground reference for internal bandgap, error amplifier, and protection circuits; must be low-impedance connection to system ground plane |
| 2 (Top View) | OUT | Regulated 1.8V output; requires 1µF ceramic capacitor placed adjacent to pin for stability and transient response |
| 3 (Top View) | IN | Input supply (2V–6V); bypassed with ≥1µF ceramic capacitor close to pin to suppress high-frequency noise and supply glitches |
Key Features
| Feature | Design Value |
|---|---|
| No minimum load requirement | Stable regulation at 0mA output - eliminates need for dummy loads in always-on monitoring circuits |
| Fast load transient response | Controlled overshoot/undershoot during 0–300mA steps - prevents logic glitches in DSP or MCU core supplies |
| Short-circuit current limit | Clamps to ~100mA when VOUT < 200mV - protects against accidental board shorts without latch-up |
| Current limit protection | Trips at 400–600mA - safeguards against sustained overload while allowing brief inrush currents |
| Ultra-low ESR capacitor support | Stable with 10–200mΩ ESR output caps - enables use of small, low-profile X5R/X7R ceramics in tight layouts |
Applications
| Wireless LAN Modules | XDSL Router Power Rails |
|---|---|
Use Scenario: Powering 2.4GHz/5GHz RF transceivers and baseband processors in compact Wi-Fi modules. IC Role / Device Role / Timing Role: Primary 1.8V LDO for RF IC core supply, decoupling switching noise from DC-DC converters. Use Value: 65dB PSRR at 100Hz and fast transient response prevent RF sensitivity degradation during packet bursts. | Use Scenario: Providing clean 1.8V supply to ADSL2+ PHY and controller ICs in residential gateways. IC Role / Device Role / Timing Role: Secondary LDO post-regulator after buck converter, ensuring stable voltage during DSL line retraining events. Use Value: 80µs start-up and no-minimum-load operation enable immediate reactivation after line fault recovery. |
| Battery-Powered Sensors | USB Peripheral Controllers |
Use Scenario: Supplying ultra-low-power environmental sensors (e.g., temperature/humidity) in coin-cell–operated IoT nodes. IC Role / Device Role / Timing Role: Main system regulator delivering 1.8V to sensor interface and BLE SoC in intermittent wake-up cycles. Use Value: 65µA IQ extends 200mAh CR2032 battery life beyond 2 years in 1-minute sampling intervals. | Use Scenario: Powering USB 2.0 hub controllers and PHYs in compact docking stations. IC Role / Device Role / Timing Role: Dedicated 1.8V rail for USB transceiver I/O buffers and PLL circuitry. Use Value: Low dropout (300mV) allows operation from 2.1V input derived from 3.3V USB VBUS via resistive divider + LDO pre-regulation. |
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 |
|---|---|---|---|
| MCP1700-1802E/TO | 250mA max output, 1.8V fixed, 1.6µA IQ - significantly lower quiescent current but lower current capability | Suitable only for sub-250mA loads; insufficient for 300mA GSM burst-mode peaks | Select when ultra-low IQ dominates over peak current demand, e.g., long-life sensor nodes with <200mA peak loads |
| Torex XC6206P182MR-G | 300mA max, 1.8V fixed, 1µF min COUT, 1.5V–6V input - identical current rating but 12µA IQ and slower 100µs start-up | Lower IQ benefits always-on systems; slower start-up may violate wake-up timing in real-time audio codecs | Select when lowest possible standby power is required and start-up timing is non-critical |
Compared with MCP1700-1802E/TO and XC6206P182MR-G, AP7333-18SRG-7 uniquely balances 300mA delivery, 65µA IQ, and 80µs start-up - making it optimal for portable applications needing both burst-current headroom and efficient sleep-mode operation.
Availability
AP7333-18SRG-7 is available at Aetrix Electronics and suitable for wireless LAN modules, XDSL router power rails, and battery-powered sensor nodes requiring stable component supply with consistent parametric performance across production batches.
Supply support for AP7333-18SRG-7 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.
The AP7333 series belongs to Diodes' low-quiescent-current LDO portfolio, engineered specifically for battery-powered portable electronics where extended runtime, fast dynamic response, and minimal board space are critical design constraints.
FAQ
What is the maximum input voltage for AP7333-18SRG-7?
The absolute maximum input voltage is 7V, but the recommended operating range is 2V to 6V. Operation above 6V risks exceeding absolute maximum ratings and may trigger thermal shutdown or reduce reliability. The device is designed for single-cell Li-ion (up to 4.2V), dual-cell alkaline (up to 3.2V), or regulated intermediate rails.
Can AP7333-18SRG-7 operate without an output capacitor?
No - a minimum 1µF ceramic output capacitor is required for stability and transient response. The device is not stable without it, and omitting the capacitor will cause oscillation or unregulated output. The datasheet explicitly states stability is guaranteed only with 1–4.7µF X5R/X7R ceramics having 10–200mΩ ESR.
Does AP7333-18SRG-7 require a minimum load current?
No - the AP7333-18SRG-7 remains stable and fully regulated at zero load current. This eliminates the need for bleed resistors or dummy loads, reducing power waste in always-on monitoring circuits and simplifying design for ultra-low-power sleep modes.
How does the thermal shutdown behave under continuous overload?
When junction temperature reaches ~140°C, the output disables; it re-enables once temperature falls to ~125°C. Under sustained overload, this causes on/off cycling - limiting average power dissipation and preventing permanent damage. The SOT23R package's 230°C/W θJA means 300mA at 2.1V input can reach shutdown in still air without copper pour.
AP7333-18SRG-7 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Diodes Incorporated
- Series:
- -
- Package/Case:
- TO-236-3, SC-59, SOT-23-3
- 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):
- -
- Current - Output:
- 300mA
- Current - Quiescent (Iq):
- 75 µA
- Current - Supply (Max):
- 85 µA
- PSRR:
- 65dB (100Hz)
- 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:
- SOT23R
AP7333-18SRG-7 FAQ
1.How can I place an order for AP7333-18SRG-7 through Aetrix?
Please submit a Request for Quotation (RFQ) for AP7333-18SRG-7 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 AP7333-18SRG-7 reliable?
The price and inventory of AP7333-18SRG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7333-18SRG-7 is usually 5 days.
3.What payment methods are accepted for AP7333-18SRG-7?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7333-18SRG-7 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AP7333-18SRG-7?
AP7333-18SRG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AP7333-18SRG-7 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 AP7333-18SRG-7?
For technical support, including AP7333-18SRG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7333-18SRG-7 requirements.
6.How does Aetrix verify that AP7333-18SRG-7 is sourced from the original manufacturer or authorized distributors?
All AP7333-18SRG-7 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 AP7333-18SRG-7 meets industry standards.
7.What is the process for return or replacement of AP7333-18SRG-7?
All AP7333-18SRG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7333-18SRG-7, 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 AP7333-18SRG-7 part is unused and in its original packaging.
Return procedure for AP7333-18SRG-7:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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