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

Diodes Incorporated AP7354-33FS4-7

Name: AP7354-33FS4-7
Brand: Diodes Incorporated
SKU: AP7354-33FS4-7
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7354-33FS4-7

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7354-33FS4-7.pdf

Description:: IC REG LINEAR 3.3V 150MA 4DFN

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Product details

Overview

AP7354-33FS4-7 from Diodes Incorporated is a fixed 3.3V, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package, featuring ±1% output voltage accuracy, 0.25µA typical quiescent current, and integrated enable control. It delivers stable power to low-power sensor modules, wearable electronics, and IoT edge nodes where battery life extension is critical.

For engineers reviewing the AP7354-33FS4-7 datasheet, AP7354-33FS4-7 pinout, AP7354-33FS4-7 application, or AP7354-33FS4-7 equivalent, key selection criteria include dropout voltage at 150mA (0.16V typ), active output discharge capability (35Ω typ), thermal resistance (295°C/W), and compatibility with 0.1µF ceramic input/output capacitors.

Technical Context

The AP7354-33FS4-7 integrates a precision voltage reference, error amplifier, current-limit circuit, and EN-controlled pass transistor. Its feedback loop uses an internal resistor network to fix VOUT at 3.3V, eliminating external resistors and reducing layout sensitivity.

It operates across 2.0V–5.5V input range with guaranteed 150mA output, supports shutdown via EN pin (0.4V max logic-low threshold), and includes built-in output discharge for rapid VOUT decay during disable-enabled only in D-suffix variants, but AP7354-33FS4-7 is non-discharge per ordering table.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.3V ±1% at +25°C; ±2% over -40°C to +85°C - ensures reliable MCU core or sensor rail regulation without trimming.
Max Output Current	150mA - sufficient to power BLE SoCs, MEMS sensors, or low-power microcontrollers in compact wearables.
Quiescent Current	0.25µA typ - extends coin-cell battery life to multi-year operation in always-on sensing applications.
Dropout Voltage	0.16V typ at 150mA - enables operation down to 3.46V input, supporting single-cell Li-ion or two-cell alkaline systems.
EN Input Threshold	V_IL ≤ 0.4V, V_IH ≥ 1.0V - compatible with 1.8V/3.3V GPIOs without level-shifting.
Thermal Resistance	θ_JA = 295°C/W - requires minimal PCB copper area for thermal management in space-constrained DFN layouts.
ESD Protection	4kV HBM - provides robust handling margin during automated assembly and field deployment.

Pinout & Package

X2-DFN1010-4 (Type B) is a 1.0mm × 1.0mm, 0.4mm pitch, 4-terminal surface-mount package with exposed thermal pad (no electrical connection). It offers high power density and low thermal impedance for space-limited portable designs.

Pin/Terminal	Circuit Role	Design Meaning
Pin 1	VOUT	Main regulated output node; connects directly to load and local 0.1µF ceramic capacitor - shortest possible trace required for stability.
Pin 2	GND	Analog/digital ground reference; must connect to PCB ground plane under device to minimize noise and ensure accurate regulation.
Pin 3	EN	Active-high enable input; floating state is undefined - tie to VIN or controlled GPIO to manage system power sequencing.
Pin 4	VIN	Input supply rail; requires 0.1µF decoupling capacitor placed adjacent to this pin to suppress supply transients.

Key Features

Feature	Design Value
Ultra-low I_Q	0.25µA typ enables >10-year battery life in 10µA average-load IoT sensors.
High Accuracy	±1% VOUT tolerance eliminates need for post-production calibration in precision analog front-ends.
Wide Input Range	2.0V–5.5V operation supports direct connection to Li-ion, Li-Po, or dual-alkaline sources without pre-regulation.
Fast Enable Response	Turn-on time <100µs (typ) allows dynamic power gating of peripherals without system latency penalty.
Robust ESD Rating	4kV HBM protection reduces risk of assembly-line damage and improves field reliability in unshielded environments.

Applications

Wearable Health Monitor

IoT Environmental Sensor Node

Use Scenario: Continuous ECG/PPG signal acquisition powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Primary 3.3V supply for analog front-end and BLE radio, enabling low-noise biasing and clean digital signaling.

Use Value: 0.25µA quiescent current extends battery life beyond 3 years while maintaining ±1% rail accuracy for ADC reference stability.

Use Scenario: Battery-powered air quality sensor logging CO₂, VOC, and humidity every 5 minutes.

IC Role / Device Role / Timing Role: Always-on LDO powering MCU sleep mode and wake-up circuitry, with EN used to gate power to sensing ICs.

Use Value: Sub-1µA shutdown current (0.02µA typ) minimizes leakage during 99%+ duty-cycled operation, preserving energy budget.

Smart Camera Module

Industrial Wireless Transmitter

Use Scenario: Miniaturized USB-C camera with motion-triggered capture and onboard image processing.

IC Role / Device Role / Timing Role: Secondary 3.3V rail for image sensor interface and ISP logic, isolated from noisy USB power domain.

Use Value: 0.16V dropout at 150mA ensures stable operation even as Li-Po voltage declines to 3.46V, avoiding brownout resets.

Use Scenario: DIN-rail mounted temperature transmitter sending data via LoRaWAN every 15 minutes.

IC Role / Device Role / Timing Role: Regulated supply for ultra-low-power MCU and RF transceiver, with EN synchronized to transmission burst timing.

Use Value: 295°C/W θ_JA allows full 150mA output within industrial ambient (-40°C to +85°C) using standard 2-layer PCB layout.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-3302E/TO	3.3V fixed, 250mA, 1.6µA I_Q, TO-92 package - 6.4× higher quiescent current, through-hole mounting.	Suitable for prototyping or low-volume industrial controls where board space is unconstrained and battery life is secondary.	Select when manual assembly or legacy through-hole infrastructure is required; avoid for space- or energy-constrained designs.
TPS70633DBVR	3.3V fixed, 150mA, 0.95µA I_Q, SOT-23-5 - 3.8× higher quiescent current, includes active discharge and power-good flag.	Better suited for systems requiring fast VOUT ramp-down and status monitoring, e.g., FPGA configuration rails.	Choose if active discharge or PG signal is mandatory; otherwise AP7354-33FS4-7 offers superior I_Q and smaller footprint.

Compared with MCP1700-3302E/TO and TPS70633DBVR, AP7354-33FS4-7 delivers the lowest quiescent current (0.25µA) in the smallest package (1.0mm²), making it optimal for miniaturized, long-life battery applications where enable control and minimal BOM count are priorities.

Availability

AP7354-33FS4-7 is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, and wireless communication modules requiring stable component supply with consistent parametric performance across production lots.

Supply support for AP7354-33FS4-7 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 semiconductor company specializing in discrete, analog, and mixed-signal devices, with design centers in Asia, Europe, and the U.S., and manufacturing in ISO/TS 16949-certified facilities.

The AP7354 series belongs to Diodes' ultra-low-I_Q LDO product line, engineered specifically for extended battery life in portable and energy-harvesting applications where micropower efficiency and small form factor are essential.

FAQ

What is the maximum input voltage rating for AP7354-33FS4-7?

The absolute maximum input voltage is 6.0V. Operation above this risks permanent damage. For reliable long-term use, the recommended input range is 2.0V to 5.5V - sufficient to cover single-cell Li-ion (4.2V max), two-cell alkaline (3.2V), or USB-powered systems (5.0V).

Does AP7354-33FS4-7 include output discharge functionality?

No. AP7354-33FS4-7 is the non-discharge variant (per Diodes' ordering table). Only part numbers with "D" suffix (e.g., AP7354D-33FS4-7) integrate active output discharge. This version relies on external pull-down or natural load decay for VOUT discharge.

Can AP7354-33FS4-7 operate with ceramic capacitors smaller than 0.1µF?

No. The datasheet specifies minimum 0.1µF ceramic input and output capacitors for stability and transient response. Using smaller values may cause oscillation or poor load step recovery. X5R/X7R dielectrics are recommended due to stable capacitance and ESR over temperature.

Is the center pad on the X2-DFN1010-4 (Type B) package electrically connected?

No. The center pad is a thermal pad only, with no electrical connection. It must be soldered to a PCB thermal copper area for heat dissipation but must not be tied to any signal or power net. Diodes' datasheet explicitly states "No connection or ground" for this pad.

AP7354-33FS4-7 Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 4-XDFN Exposed Pad

Packaging:: Tape & Reel (TR)

Product Status:: Active

Output Configuration:: Positive

Output Type:: Fixed

Number of Regulators:: 1

Voltage - Input (Max):: 5.5V

Voltage - Output (Min/Fixed):: 3.3V

Voltage - Output (Max):: -

Voltage Dropout (Max):: 0.35V @ 150mA

Current - Output:: 150mA

Current - Quiescent (Iq):: 0.6 µA

Current - Supply (Max):: -

PSRR:: -

Control Features:: Enable

Protection Features:: Over Current

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

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4

AP7354-33FS4-7 FAQ

1.How can I place an order for AP7354-33FS4-7 through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7354-33FS4-7 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 AP7354-33FS4-7 reliable?

The price and inventory of AP7354-33FS4-7 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7354-33FS4-7 is usually 5 days.

3.What payment methods are accepted for AP7354-33FS4-7?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7354-33FS4-7 transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7354-33FS4-7?

AP7354-33FS4-7 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7354-33FS4-7 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 AP7354-33FS4-7?

For technical support, including AP7354-33FS4-7 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7354-33FS4-7 requirements.

6.How does Aetrix verify that AP7354-33FS4-7 is sourced from the original manufacturer or authorized distributors?

All AP7354-33FS4-7 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 AP7354-33FS4-7 meets industry standards.

7.What is the process for return or replacement of AP7354-33FS4-7?

All AP7354-33FS4-7 units undergo pre-shipment inspection (PSI). If there is an issue with AP7354-33FS4-7, 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 AP7354-33FS4-7 part is unused and in its original packaging.

Return procedure for AP7354-33FS4-7:

1.Submit a request within 90 days.

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

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