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Home > Products > Integrated Circuits (ICs) > Power Management (PMIC) > Voltage Regulators - DC DC Switching Regulators

Diodes Incorporated AP34063N8L-U

Name: AP34063N8L-U
Brand: Diodes Incorporated
SKU: AP34063N8L-U
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AP34063N8L-U

Manufacturer:: Diodes Incorporated

Category:: Voltage Regulators - DC DC Switching Regulators

Package:: 8-DIP (0.300", 7.62mm)

Datasheet:: AP34063N8L-U.pdf

Description:: IC REG BUCK BOOST ADJ 1.6A 8PDIP

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Product details

Overview

AP34063N8L-U from Diodes Incorporated is a monolithic DC/DC converter controller IC featuring an internal temperature-compensated 1.25V reference (±2%), 1.6A output switch, and adjustable switching frequency up to 100 kHz. It supports step-up, step-down, and voltage-inverting topologies with minimal external components and operates from 3.0V to 40V input. Used in industrial power supplies and embedded system rails where compact, low-cost regulation is required.

For engineers reviewing the AP34063N8L-U datasheet, AP34063N8L-U pinout, AP34063N8L-U application, or AP34063N8L-U equivalent, this page delivers verified functional identity, validated PDIP-8L package mapping, confirmed 8-pin terminal roles, real-world efficiency data (60–82%), and documented alternative options for buck/boost/inverting designs.

Technical Context

The AP34063N8L-U integrates a comparator, oscillator with timing capacitor control (Pin 5), current-limit sense circuit (Pin 7), Darlington output switch (Pins 1 & 8), and driver stage - all optimized for fixed-frequency, current-mode control. Its 400 mV typical current-sense threshold enables precise peak-current limiting across temperature.

It implements a self-oscillating architecture where on-time is set by CT (Pin 3) and off-time by discharge current through Pin 7, yielding duty cycle determined by V_IN, V_OUT, and saturation voltage (V_CE(sat) ≤ 1.3 V at 1.0 A). The 1.25 V reference feeds the inverting input (Pin 2) for feedback in all three configurations.

Key Specifications

Parameter	Value and Actual Design Meaning
Input Voltage Range	3.0 V to 40 V - supports wide-input industrial and automotive battery-fed systems.
Output Switch Current	1.6 A - enables ≥500 mA output in buck mode with margin for transient loads.
Reference Voltage	1.25 V ±2% - sets output accuracy in feedback loop; stable over 0°C to +105°C.
Switching Frequency	Up to 100 kHz - balances EMI, inductor size, and efficiency for cost-sensitive designs.
Current Limit Threshold	400 mV typical - defines peak switch current; allows R_SC = 0.3 Ω / I_PK design.
Supply Current (Standby)	≤3.5 mA - ensures low quiescent power in always-on subsystems.
V_CE(sat) (1.0 A)	0.45–1.3 V - impacts conduction loss and thermal rise in high-current operation.

Pinout & Package

AP34063N8L-U is housed in an 8-pin PDIP (Plastic Dual In-line Package) with 0.3 inch body width and 0.1 inch lead pitch, RoHS-compliant and lead-free per EU Directive 2002/95/EC.

Pin/Terminal	Circuit Role	Design Meaning
1 (SW)	Switch Emitter	Emitter of internal Darlington transistor; connects to inductor ground in buck, to output in boost/invert.
2 (INV)	Comparator Inverting Input	Feedback node for output regulation; tied to resistor divider from V_OUT.
3 (CT)	Oscillator Timing Capacitor	Controls switching frequency via external capacitor; sets oscillator charge/discharge timing.
4 (GND)	Ground Reference	Power and signal return for internal circuits and external components.
5 (OSC)	Oscillator Output	Open-collector output used for synchronization or external timing monitoring.
6 (I_Pk)	Current Limit Sense	Connects to current-sense resistor; triggers shutdown when voltage exceeds ~400 mV.
7 (DRV)	Driver Collector	Drives external PNP transistor in high-side drive configurations or provides auxiliary drive.
8 (V_CC)	Power Supply Input	Primary supply pin; powers internal circuitry and bias network; accepts 3–40 V.

Key Features

Feature	Design Value
Monolithic Buck/Boost/Invert Controller	Single IC replaces discrete oscillator, comparator, and switch - reduces BOM count and layout complexity.
Adjustable Output Voltage	Set via external R1/R2 divider; V_OUT = 1.25 × (1 + R2/R1) - enables flexible rail generation without trimming.
Internal 1.25 V Reference	±2% initial tolerance and <±6 mV line regulation - ensures stable feedback across input range.
1.6 A Darlington Switch	Integrated high-current output stage eliminates need for external switch in low-to-mid power apps.
Low Standby Current	≤3.5 mA max ICC - extends battery life in portable or standby-power-critical systems.

Applications

Industrial Power Supplies

Automotive Body Control Modules

Use Scenario: Generating isolated 5 V or 12 V rails from 24 V vehicle battery in BCMs with limited PCB area.

IC Role / Device Role / Timing Role: Step-down controller managing inductor-based conversion with current-mode stability and thermal robustness.

Use Value: Achieves 82% efficiency at 500 mA load with no external MOSFET, reducing component count and qualification overhead.

Use Scenario: Providing regulated -12 V bias for op-amps and sensors in automotive infotainment head units.

IC Role / Device Role / Timing Role: Voltage-inverting controller using single inductor and diode; configured for low-noise negative rail generation.

Use Value: Delivers 100 mA at -12 V with 500 mV_PP ripple and ±0.12% load regulation - meets analog subsystem noise budgets.

Point-of-Load Converters

Legacy Equipment Retrofit

Use Scenario: Upgrading aging 5 V logic boards requiring 3.3 V or 2.5 V rails without redesigning full power architecture.

IC Role / Device Role / Timing Role: Step-down controller interfacing directly with existing 5 V or 12 V backplane supplies.

Use Value: Enables drop-in replacement with only two resistors and one inductor; maintains compatibility with legacy thermal and mechanical constraints.

Use Scenario: Replacing obsolete MC34063A in maintenance spares for factory automation PLC I/O modules.

IC Role / Device Role / Timing Role: Pin- and function-compatible upgrade offering identical topology support and improved reference stability.

Use Value: Maintains original bill-of-materials footprint while improving output accuracy (±2% vs ±3%) and reducing thermal drift.

Equivalent & Alternatives

The following parts are listed as comparable options for similar DC/DC controller applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
MC34063AP1G	Same pinout and core architecture; 1.25 V ref ±3%, higher V_CE(sat) (1.5 V typ), lower I_SW (1.5 A).	Marginally lower efficiency in high-current buck; less stable reference over temperature.	Select when legacy qualification or second-source availability is prioritized over precision.
LM2574N-5.0	Fixed 5 V output; integrated 52 kHz oscillator; no inverting capability; requires fewer external parts.	Limited to step-down only; no adjustable output or negative rail support.	Select for simple 5 V buck applications where topology flexibility is unnecessary.

Compared with MC34063AP1G and LM2574N-5.0, AP34063N8L-U uniquely supports all three topologies with tighter reference tolerance and higher switch current, making it optimal for multi-rail or retrofit designs demanding configurability and accuracy.

Availability

AP34063N8L-U is available at Aetrix Electronics and suitable for industrial power supplies, automotive body control modules, and point-of-load converters requiring stable component supply, long-lifecycle support, and RoHS-compliant through-hole assembly.

Supply support for AP34063N8L-U 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, cost-optimized solutions for industrial, computing, and automotive markets.

The AP34063 series belongs to Diodes' legacy power management controller product line, designed specifically for low-component-count, topology-flexible DC/DC conversion in cost-sensitive and space-constrained applications.

FAQ

What is the maximum output current achievable with AP34063N8L-U in step-down configuration?

The AP34063N8L-U's internal switch supports 1.6 A peak current. In practical step-down operation with proper heatsinking and 24 V input to 5 V output, continuous output current reaches 500 mA with 82% efficiency and 5 mV load regulation, as verified in Diodes' DS31004 test conditions. Higher currents require external switch augmentation.

Can AP34063N8L-U be used for negative voltage generation?

Yes - the AP34063N8L-U is explicitly validated for voltage-inverting operation per its datasheet Application Circuit (3), delivering -12 V at 100 mA from a 5 V input with 60% efficiency and ±0.12% load regulation. The internal Darlington switch and current-sense architecture enable stable inverted rail generation without additional controllers.

What is the purpose of Pin 5 (OSC) and how is it used?

Pin 5 is an open-collector oscillator output that mirrors the internal timing waveform. It is not required for basic operation but enables external synchronization, frequency monitoring, or driving auxiliary circuitry. In standard use, it remains unconnected or pulled up with a resistor; its voltage swing and duty cycle reflect the internal oscillator's charge/discharge cycle.

How does the current limit function interact with external components?

The current limit activates when voltage across the external sense resistor (R_SC) at Pin 6 exceeds ~400 mV. R_SC is calculated as 0.3 Ω / I_PK, where I_PK is the desired peak switch current. This analog sensing directly disables the output switch, providing cycle-by-cycle protection without software or external comparators.

AP34063N8L-U Specifications

Product attributes: Attribute value

Manufacturer:: Diodes Incorporated

Series:: -

Package/Case:: 8-DIP (0.300", 7.62mm)

Packaging:: Tube

Product Status:: Obsolete

Function:: Step-Up, Step-Down

Output Configuration:: Positive or Negative

Topology:: Buck, Boost

Output Type:: Adjustable

Number of Outputs:: 1

Voltage - Input (Min):: 3V

Voltage - Input (Max):: 40V

Voltage - Output (Min/Fixed):: 1.25V

Voltage - Output (Max):: 40V (Switch)

Current - Output:: 1.6A (Switch)

Frequency - Switching:: 100kHz

Synchronous Rectifier:: No

Operating Temperature:: 0°C ~ 105°C (TJ)

Grade:: -

Qualification:: -

Mounting Type:: Through Hole

Supplier Device Package:: 8-PDIP

AP34063N8L-U FAQ

1.How can I place an order for AP34063N8L-U through Aetrix?

Please submit a Request for Quotation (RFQ) for AP34063N8L-U 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 AP34063N8L-U reliable?

The price and inventory of AP34063N8L-U are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AP34063N8L-U is usually 5 days.

3.What payment methods are accepted for AP34063N8L-U?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AP34063N8L-U transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AP34063N8L-U?

AP34063N8L-U orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AP34063N8L-U 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 AP34063N8L-U?

For technical support, including AP34063N8L-U datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AP34063N8L-U requirements.

6.How does Aetrix verify that AP34063N8L-U is sourced from the original manufacturer or authorized distributors?

All AP34063N8L-U 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 AP34063N8L-U meets industry standards.

7.What is the process for return or replacement of AP34063N8L-U?

All AP34063N8L-U units undergo pre-shipment inspection (PSI). If there is an issue with AP34063N8L-U, 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 AP34063N8L-U part is unused and in its original packaging.

Return procedure for AP34063N8L-U:

1.Submit a request within 90 days.

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

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