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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Diodes Incorporated AP133-SNG-7

Name: AP133-SNG-7
Brand: Diodes Incorporated
SKU: AP133-SNG-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP133-SNG-7

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - Linear, Low Drop Out (LDO) Regulators

Package:: 6-UDFN Exposed Pad

Datasheet:: AP133-SNG-7.pdf

Description:: IC REG LDO ADJ 0.3A 6DFN

Quantity:: RFQ Add To RFQ list

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Inventory:110

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Product details

Overview

AP133-SNG-7 from Diodes Incorporated is a 300mA adjustable-output low-dropout linear regulator in DFN2020-6 package, featuring 40μA quiescent current, 350mV dropout at full load, 65dB PSRR at 1kHz, and ultra-fast 25μs startup. It delivers stable 1V–5V output for battery-powered portable electronics requiring high efficiency and transient robustness.

For engineers reviewing the AP133-SNG-7 datasheet, AP133-SNG-7 pinout, AP133-SNG-7 application, or AP133-SNG-7 equivalent, key selection criteria include low-I_Q operation across input range (2V–6V), thermal shutdown at +145°C, current limit (~600mA), and compatibility with 1μF ceramic output capacitors - critical for space-constrained mobile designs.

Technical Context

The AP133 employs an internal 0.8V bandgap reference and error amplifier to regulate output via external R1/R2 feedback divider. Its pass transistor architecture supports adjustable output while maintaining stability with low-ESR ceramic capacitors down to 1μF.

Protection circuitry includes foldback current limiting (typ. 600mA), short-circuit clamping (~120mA), and thermal shutdown with 20°C hysteresis. EN pin enables logic-controlled on/off operation with VIH ≥1.4V and VIL ≤0.4V, supporting direct microcontroller interfacing.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Current	300mA max - sufficient for baseband processors and RF ICs in handheld devices
Quiescent Current	40μA typ. - enables >340μA standby current reduction vs. 140μA alternatives, extending battery life
Dropout Voltage	350mV at 300mA - allows operation down to 3.2V Li-ion battery voltage while delivering 2.85V core supply
PSRR	65dB at 1kHz - suppresses switching noise from PMICs or DC-DC converters feeding adjacent analog/RF blocks
Startup Time	25μs - supports rapid wake-up from deep sleep in GSM/TDMA burst-mode systems
Input Voltage Range	2V to 6V - accommodates single-cell Li-ion (2.7–4.2V), Li-poly, or dual-cell alkaline inputs
Output Accuracy	±2% - ensures reliable voltage margin for 1.8V/2.5V/3.3V digital logic without trimming

Pinout & Package

AP133-SNG-7 uses the DFN2020-6 (2.0mm × 2.0mm, 0.5mm pitch) package with wettable flank leads for automated optical inspection. Thermal resistance θ_JA is 142°C/W on FR-4 with minimum pad layout.

Pin/Terminal	Circuit Role	Design Meaning
1 (EN)	Enable input	Active-high logic control; ties to MCU GPIO or power sequencer; VIH ≥1.4V required for turn-on
2 (GND)	Ground reference	Common return path for IN, OUT, ADJ, and EN; must connect to low-impedance ground plane
3 (IN)	Input voltage	Accepts 2V–6V; requires ≥0.1μF ceramic bypass capacitor placed adjacent to pin
4 (OUT)	Regulated output	Delivers 1V–5V set by external resistor divider; bypassed with 1–4.7μF X7R/X5R ceramic cap
5 (NC)	No connection	Internally unconnected; must remain floating - no PCB trace or solder mask opening required
6 (ADJ)	Feedback reference	Connects to R1–R2 divider node; references internal 0.8V bandgap; R2 ≤250kΩ for stability

Key Features

Feature	Design Value
Ultra-low quiescent current	40μA across full input (2V–6V) and load (0–300mA) range - minimizes battery drain during idle
Fast transient response	Stable under 0→300mA load steps with minimal overshoot/undershoot - supports DSP/GSM burst-mode loads
Low-ESR capacitor support	Stable with 1μF ceramic output capacitor - reduces board area and cost vs. larger tantalum solutions
Integrated protection	Current limit (~600mA), short-circuit clamp (~120mA), and thermal shutdown (+145°C) - eliminates need for external fault management
Adjustable output range	1.0V to 5.0V via two-resistor divider - enables single BOM for multiple voltage rails in portable platforms

Applications

Cellular Baseband Power

GSM RF Front-End Supply

Use Scenario: Powers ARM-based baseband processor cores (1.8V/2.5V) in 2G/3G handsets during TDMA transmit/receive bursts.

IC Role / Device Role / Timing Role: Adjustable LDO providing clean, fast-response voltage rail synchronized to burst timing.

Use Value: 25μs startup and <±1% load regulation enable immediate core wake-up without brownout; 40μA I_Q extends standby time by >40% vs. legacy regulators.

Use Scenario: Supplies LNA, mixer, and VCO stages in GSM handset RF transceivers requiring low-noise, high-PSRR bias.

IC Role / Device Role / Timing Role: High-PSRR (65dB @1kHz) post-regulator filtering switching noise from shared PMIC outputs.

Use Value: 65dB PSRR attenuates 217Hz GSM burst interference, preventing receiver desensitization and audio artifacts.

Bluetooth Headset Audio Codec

Portable Media Player Core Logic

Use Scenario: Delivers 3.3V to stereo audio codec and Bluetooth radio in compact wearable headsets.

IC Role / Device Role / Timing Role: Low-noise, enable-controlled LDO enabling zero-power shutdown between voice calls.

Use Value: EN pin logic control and 40μA shutdown current eliminate battery drain during call idle - critical for 100+ hour standby.

Use Scenario: Regulates 1.2V core voltage for MP3/MP4 decoder SoCs operating from single Li-ion cell.

IC Role / Device Role / Timing Role: Adjustable LDO with wide VIN range (2V–6V) tracking battery discharge curve.

Use Value: 350mV dropout allows full 300mA delivery until battery reaches 3.2V, maximizing usable capacity per charge cycle.

Equivalent & Alternatives

The following parts are listed as comparable options for similar adjustable LDO applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AP7330-WG-7	Fixed 3.3V output; 300mA; 60μA I_Q; SOT25 only	Lacks adjustability and EN pin; limited to single-rail use cases	Select when fixed 3.3V output suffices and board space permits SOT25 over DFN2020-6
AP7343-SNG-7	Adjustable 0.8V–5.0V; 500mA; 50μA I_Q; DFN2020-6; 200mV dropout @500mA	Higher current, lower dropout, but higher I_Q and newer generation	Prefer for new designs needing >300mA or tighter dropout; AP133 remains valid for legacy qualification

Compared with AP7330-WG-7, AP133-SNG-7 offers design flexibility via adjustable output and enable control, while AP7343-SNG-7 improves on current capability and dropout but trades off 10μA higher quiescent current - making AP133 optimal for cost-sensitive, battery-limited legacy portable designs.

Availability

AP133-SNG-7 is available at Aetrix Electronics and suitable for cellular handsets, Bluetooth audio accessories, and portable media players requiring stable component supply with long lifecycle visibility and RoHS-compliant green packaging.

Supply support for AP133-SNG-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 power management, signal integrity, and protection solutions for consumer, industrial, and computing markets.

The AP133 belongs to Diodes' low-power LDO portfolio designed specifically for battery-operated portable electronics where ultra-low quiescent current, fast transient response, and small-footprint packaging are essential.

FAQ

What is the minimum output capacitor value required for stability with AP133-SNG-7?

The AP133-SNG-7 is stable with a minimum 1μF X7R or X5R ceramic output capacitor. Lower ESR values (10–100mΩ) are recommended, and capacitance may be increased up to 4.7μF to improve load transient response. Placement must be adjacent to OUT and GND pins with short traces.

Can AP133-SNG-7 be used without the EN pin connected?

Yes - if enable functionality is not needed, the EN pin must be tied directly to the IN pin to ensure continuous operation. Leaving EN floating is not permitted, as it may cause erratic on/off behavior due to noise susceptibility and undefined logic state.

What is the maximum junction temperature before thermal shutdown activates?

Thermal shutdown triggers at approximately +145°C junction temperature, with +20°C hysteresis. The device resumes normal operation once junction temperature falls to ~+125°C. This protects against sustained overload or poor PCB thermal design without requiring external thermal monitoring.

How does the ADJ pin reference voltage affect output accuracy?

The ADJ pin references an internal 0.8V ±2% bandgap voltage. Output accuracy depends on both this reference tolerance and resistor divider ratio precision. Using 1% resistors yields total output error within ±3%, meeting typical digital core supply requirements without calibration.

AP133-SNG-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 6-UDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Adjustable

Number of Regulators:: 1

Voltage - Input (Max):: 6V

Voltage - Output (Min/Fixed):: 1V

Voltage - Output (Max):: 5V

Voltage Dropout (Max):: 0.45V @ 300mA

Current - Output:: 300mA

Current - Quiescent (Iq):: 60 µA

Current - Supply (Max):: -

PSRR:: 65dB (1kHz)

Control Features:: Enable

Protection Features:: Over Current, Over Temperature, Short Circuit

Operating Temperature:: -40°C ~ 85°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: U-DFN2020-6

AP133-SNG-7 FAQ

1.How can I place an order for AP133-SNG-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP133-SNG-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 AP133-SNG-7 reliable?

The price and inventory of AP133-SNG-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP133-SNG-7 is usually 5 days.

3.What payment methods are accepted for AP133-SNG-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP133-SNG-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP133-SNG-7?

AP133-SNG-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP133-SNG-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 AP133-SNG-7?

For technical support, including AP133-SNG-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP133-SNG-7 requirements.

6.How does Aetrix verify that AP133-SNG-7 is sourced from the original manufacturer or authorized distributors?

All AP133-SNG-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 AP133-SNG-7 meets industry standards.

7.What is the process for return or replacement of AP133-SNG-7?

All AP133-SNG-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP133-SNG-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 AP133-SNG-7 part is unused and in its original packaging.

Return procedure for AP133-SNG-7:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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