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

Diodes Incorporated AP7351D-30FS4-7B

Name: AP7351D-30FS4-7B
Brand: Diodes Incorporated
SKU: AP7351D-30FS4-7B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP7351D-30FS4-7B

Manufacturer:: Diodes Incorporated

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

Package:: 4-XDFN Exposed Pad

Datasheet:: AP7351D-30FS4-7B.pdf

Description:: LDO CMOS LOWCURR X2-DFN1010-4 (T

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Product details

Overview

AP7351D-30FS4-7B from Diodes Incorporated is a 3.0V fixed-output, 150mA ultra-low quiescent current LDO regulator in X2-DFN1010-4 (Type B) package, featuring ±1% output voltage accuracy, 0.5µA quiescent current, and enable-controlled shutdown. It delivers stable power to low-power wearable sensors and IoT edge nodes operating from 1.4V–5.5V input sources.

For engineers reviewing the AP7351D-30FS4-7B datasheet, AP7351D-30FS4-7B pinout, AP7351D-30FS4-7B application, or AP7351D-30FS4-7B equivalent, key selection criteria include dropout voltage at 150mA (0.18V typ), active output discharge resistance (35Ω), thermal shutdown threshold (+160°C), and compatibility with 0.1µF ceramic input/output capacitors.

Technical Context

The AP7351D-30FS4-7B integrates a precision voltage reference, error amplifier, current-limit circuit, and enable logic to regulate 3.0V output from inputs as low as 1.4V. Its internal resistor network fixes the output, eliminating external feedback components.

It supports fast enable turn-on/turn-off response (sub-100µs), includes active output discharge during shutdown, and maintains stability with minimal 0.1µF ceramic capacitors on both input and output-critical for space-constrained battery-powered designs.

Key Specifications

Parameter	Value and Actual Design Meaning
Output Voltage	Fixed 3.0V ±1% at +25°C; ±2% over −40°C to +85°C - ensures stable MCU core or sensor bias under temperature variation.
Max Output Current	150mA - sufficient to power BLE SoCs, MEMS sensors, or low-power microcontrollers without derating.
Quiescent Current	0.5µA typ - extends battery life in always-on wearables by minimizing standby drain.
Dropout Voltage	0.18V typ at 150mA - enables operation down to 3.18V input, preserving runtime as battery discharges.
PSRR	60dB at 1kHz - suppresses switching noise from adjacent DC-DC converters feeding the LDO input.
Enable Threshold	V_EN(H) ≥ 1.0V, V_EN(L) ≤ 0.4V - compatible with 1.8V/3.3V GPIO without level-shifting.
Thermal Shutdown	+160°C threshold with +20°C hysteresis - protects against sustained overload in sealed enclosures.

Pinout & Package

X2-DFN1010-4 (Type B) package: 1.0mm × 1.0mm, 0.65mm pitch, exposed thermal pad (EP) - optimized for ultra-compact PCB layouts and thermal dissipation in thin-profile wearables.

Pin/Terminal	Circuit Role	Design Meaning
PIN1 (VOUT)	Regulated output node	Delivers clean 3.0V; requires 0.1µF ceramic capacitor placed within 2mm of this pin and GND for stability.
PIN2 (GND)	Power ground reference	Must connect directly to low-impedance ground plane; shared return path for VIN, VOUT, and EP improves PSRR.
PIN3 (EN)	Active-high enable control	Pulling below 0.4V disables regulator and activates 35Ω output discharge; must not float.
PIN4 (VIN)	Input power supply	Accepts 1.4V–5.5V; requires 0.1µF decoupling capacitor adjacent to pin to suppress supply transients.
EP (Exposed Pad)	Thermal dissipation path	Should be soldered to ≥40mm² copper area tied to GND - reduces θ_JA from 237°C/W to ~120°C/W in typical layout.

Key Features

Feature	Design Value
Ultra-low I_Q	0.5µA typical - enables multi-year battery life in coin-cell–powered IoT endpoints.
Active Output Discharge	35Ω internal FET - rapidly discharges VOUT after shutdown, preventing residual voltage from interfering with system reset sequencing.
Wide Input Range	1.4V to 5.5V - supports direct Li-ion, Li-Po, or 2×AA alkaline input without pre-regulation.
High Accuracy	±1% at +25°C, ±2% over full temperature range - eliminates need for post-regulation trimming in precision analog sensor chains.
Small Footprint	X2-DFN1010-4 (1.0mm × 1.0mm) - saves >70% board area vs. SOT25, critical for earbud and smart ring form factors.

Applications

Wearable Health Monitor

IoT Sensor Node

Use Scenario: Continuous ECG/PPG sensing in wrist-worn device powered by CR2032 coin cell.

IC Role / Device Role / Timing Role: Primary 3.0V supply for analog front-end and BLE radio, enabled only during measurement bursts.

Use Value: 0.5µA quiescent current extends battery life to >12 months; active discharge prevents false wake-up from residual VOUT.

Use Scenario: Battery-powered environmental sensor (temp/humidity/pressure) transmitting data hourly via LoRaWAN.

IC Role / Device Role / Timing Role: Always-on 3.0V rail for real-time clock and sensor bias; EN toggled by microcontroller before each transmission.

Use Value: 1.4V minimum VIN allows operation until battery drops to 2.0V; 60dB PSRR isolates ADC from RF switching noise.

Smart Camera Module

Industrial Wireless Transmitter

Use Scenario: Ultra-thin AR glasses with embedded 1MP image sensor and low-power ISP.

IC Role / Device Role / Timing Role: Dedicated 3.0V LDO for image sensor analog core, sequenced after main power rail.

Use Value: 0.18V dropout preserves headroom during peak 120mA sensor burst; ±1% accuracy ensures consistent pixel response.

Use Scenario: DIN-rail mounted vibration monitor using MEMS accelerometer and NB-IoT modem.

IC Role / Device Role / Timing Role: Secondary 3.0V supply for signal conditioning and modem interface logic, isolated from noisy 12V industrial bus.

Use Value: 237°C/W θ_JA with proper EP layout sustains operation at +70°C ambient; EN pin enables remote firmware-triggered power cycling.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
MCP1700-3002E/TO	3.0V fixed, 250mA, 1.6µA I_Q, SOT23-5 package, no output discharge	Larger footprint, higher quiescent current, no active discharge - less suitable for rapid power cycling	Select when higher output current margin is needed and board space permits SOT23-5; avoid where fast VOUT discharge is required.
Torex XC6210B302MR-G	3.0V fixed, 150mA, 1.0µA I_Q, USP-4 package (1.2mm × 1.6mm), no output discharge	2.5× larger footprint than X2-DFN1010-4, no discharge FET, slightly higher I_Q	Choose for legacy USP-4 compatibility or where thermal pad routing is impractical; not optimal for space-critical wearables.

Compared with MCP1700-3002E/TO and XC6210B302MR-G, AP7351D-30FS4-7B offers the smallest footprint, lowest quiescent current, and unique active output discharge - making it the preferred choice for miniaturized, battery-sensitive systems requiring precise power sequencing.

Availability

AP7351D-30FS4-7B is available at Aetrix Electronics and suitable for wearable electronics, IoT sensor nodes, and industrial wireless transmitters requiring stable component supply with guaranteed long-term availability and traceable sourcing.

Supply support for AP7351D-30FS4-7B 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-efficiency power management, signal integrity, and protection solutions for consumer, industrial, and automotive markets.

The AP7351D belongs to Diodes' ultra-low-I_Q LDO family, designed specifically for energy-constrained portable and wireless devices where extended battery life and minimal PCB area are primary design constraints.

FAQ

What is the minimum input voltage required for AP7351D-30FS4-7B to maintain regulation at 150mA load?

The minimum input voltage is calculated as V_OUT + V_DROP = 3.0V + 0.18V = 3.18V (typical). At worst-case conditions (−40°C to +85°C, 150mA), dropout reaches 0.35V, requiring VIN ≥ 3.35V to sustain regulation. Below this, output voltage collapses linearly with input.

Can AP7351D-30FS4-7B operate without an output capacitor?

No. The device requires a minimum 0.1µF ceramic capacitor between VOUT and GND for stability and transient response. Omitting C_OUT causes oscillation and potential damage. X5R/X7R dielectrics are recommended due to stable capacitance and low ESR across temperature.

How does the exposed pad (EP) affect thermal performance?

The EP must be soldered to a ≥40mm² copper pour connected to GND. This reduces thermal resistance from 237°C/W (no EP connection) to approximately 120°C/W, allowing continuous 150mA operation at +70°C ambient. Leaving EP unconnected degrades thermal performance by >90%.

Is AP7351D-30FS4-7B qualified for automotive applications?

No. While the AP7351D series supports industrial temperature range (−40°C to +85°C), it is not AEC-Q100 qualified. Diodes offers automotive-grade variants (e.g., AP7351Q) with PPAP capability and IATF 16949 manufacturing - contact Diodes directly for those part numbers.

AP7351D-30FS4-7B 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):: 3V

Voltage - Output (Max):: -

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

Current - Output:: 150mA

Current - Quiescent (Iq):: 1 µA

Current - Supply (Max):: -

PSRR:: 60dB (1kHz)

Control Features:: Current Limit, Enable

Protection Features:: Over Current

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

Grade:: Automotive

Qualification:: AEC-Q100

Mounting Type:: Surface Mount

Supplier Device Package:: X2-DFN1010-4 (Type B)

AP7351D-30FS4-7B FAQ

1.How can I place an order for AP7351D-30FS4-7B through Aetrix?

Please submit a Request for Quotation (RFQ) for AP7351D-30FS4-7B 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 AP7351D-30FS4-7B reliable?

The price and inventory of AP7351D-30FS4-7B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP7351D-30FS4-7B is usually 5 days.

3.What payment methods are accepted for AP7351D-30FS4-7B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP7351D-30FS4-7B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP7351D-30FS4-7B?

AP7351D-30FS4-7B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP7351D-30FS4-7B 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 AP7351D-30FS4-7B?

For technical support, including AP7351D-30FS4-7B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP7351D-30FS4-7B requirements.

6.How does Aetrix verify that AP7351D-30FS4-7B is sourced from the original manufacturer or authorized distributors?

All AP7351D-30FS4-7B 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 AP7351D-30FS4-7B meets industry standards.

7.What is the process for return or replacement of AP7351D-30FS4-7B?

All AP7351D-30FS4-7B units undergo pre-shipment inspection (PSI). If there is an issue with AP7351D-30FS4-7B, 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 AP7351D-30FS4-7B part is unused and in its original packaging.

Return procedure for AP7351D-30FS4-7B:

1.Submit a request within 90 days.

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

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