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HomeProductsIntegrated Circuits (ICs)PMIC - Voltage Regulators - LinearMAX603EPA+
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MAX603EPA+ - Analog Devices Inc./Maxim Integrated

Manufacturer Part Number
MAX603EPA+
Manufacturer
Maxim Integrated
Allelco Part Number
32D-MAX603EPA+
Warranty
1 Year Allelco Warranty - Find out more
Stock Status:
9,554 pcs available, New & Original
Parts Description
IC REG LIN POS ADJ 500MA 8DIP
Package
8-PDIP
Data sheet
MAX603EPA+.pdf

Part Numbering Guide

Part Numbering System.pdf
RoHs Status
ROHS3 Compliant
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Our certification
In stock: 9554

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Specifications

MAX603EPA+ Tech Specifications
Analog Devices Inc./Maxim Integrated - MAX603EPA+ technical specifications, attributes, parameters and parts with similar specifications to Analog Devices Inc./Maxim Integrated - MAX603EPA+

Product Attribute Attribute Value
Manufacturer Maxim Integrated
Voltage Dropout (Max) 0.55V @ 500mA
Voltage - Output (Min/Fixed) 1.25V (5V)
Voltage - Output (Max) 11V
Voltage - Input (Max) 11.5V
Supplier Device Package 8-PDIP
Series -
Protection Features Over Current, Over Temperature, Reverse Polarity
Package / Case 8-DIP (0.300', 7.62mm)
Package Tube
Product Attribute Attribute Value
PSRR -
Output Type Adjustable (Fixed)
Output Configuration Positive
Operating Temperature -40°C ~ 85°C
Number of Regulators 1
Mounting Type Through Hole
Current - Quiescent (Iq) 35 µA
Current - Output 500mA
Control Features Enable
Base Product Number MAX603

Environmental & Export Classifications

ATTRIBUTE DESCRIPTION
RoHs Status ROHS3 Compliant
Moisture Sensitivity Level (MSL) 1 (Unlimited)
REACH Status REACH Unaffected
ECCN EAR99
HTSUS 8542.39.0001

Parts Introduction

MAX603EPA+ Image
MAX603EPA+ (1)

Manufacturer Part Number

MAX603EPA+

Manufacturer

analog-devices

Introduction

The MAX603EPA+ is a high-performance, low-dropout (LDO) linear voltage regulator from Analog Devices. It provides a regulated and adjustable output voltage from an unregulated input voltage, making it suitable for a wide range of applications that require a stable and reliable power supply.

Product Features and Performance

Adjustable output voltage from 1.25V to 11V

Maximum output current of 500mA

Low quiescent current of 35μA

Excellent load and line regulation

Fast transient response

Thermal overload and short-circuit protection

Reverse-polarity protection

Product Advantages

Compact and space-efficient DIP package

Wide input voltage range up to 11.5V

Excellent output voltage accuracy and stability

Robust protection features for reliable operation

Suitable for a variety of applications

Key Reasons to Choose This Product

Reliable and stable power supply solution

Efficient power management with low power consumption

Comprehensive protection features for safe operation

Versatile design for use in diverse applications

Ease of integration and implementation

Quality and Safety Features

Thermal overload protection

Short-circuit protection

Reverse-polarity protection

Meets industry safety and reliability standards

Compatibility

The MAX603EPA+ is compatible with a wide range of electronic devices and systems that require a regulated and adjustable power supply, such as industrial equipment, consumer electronics, and telecommunication systems.

Application Areas

Industrial and automation equipment

Telecommunications and networking devices

Consumer electronics and appliances

Medical and scientific instrumentation

Automotive and transportation systems

Product Lifecycle

The MAX603EPA+ is an active product in our website's sales team's portfolio. There are no immediate plans for discontinuation. Customers are advised to check with our website's sales team or their authorized distributors for the latest information on availability and any potential alternative models.

Frequently Asked Questions(FAQ)

What are the key performance trade-offs when using the MAX603EPA+ linear regulator in a 5V output configuration at maximum load current?
When configuring the MAX603EPA+ for a 5V fixed output using the internal reference voltage divider, the dropout voltage becomes critical. At 500mA output current, the maximum dropout is specified as 0.55V, requiring a minimum input of 5.55V to maintain regulation. This creates a design constraint where input voltages below this threshold will result in output droop under full load. Additionally, the 35µA quiescent current contributes to power loss in battery-powered applications, and while acceptable for many systems, it may impact overall efficiency compared to switching regulators in low-power scenarios.
How does the thermal performance of the MAX603EPA+ compare to similar adjustable regulators when delivering 400mA with a 9V input?
With a 9V input and 5V output at 400mA, the MAX603EPA+ dissipates approximately 1.6W (calculated as (9-5) × 0.4 = 1.6W). In an 8-DIP package, this requires careful heatsinking or derating according to the junction-to-ambient thermal resistance curve. Compared to integrated regulators in similar packages, the MAX603's performance aligns closely with other standard DIP-packaged linear regulators, though surface-mount alternatives typically offer better thermal characteristics. The device includes overtemperature protection that will shut down the regulator if junction temperature exceeds safe limits.
What external components are required to implement a 3.3V output using the MAX603EPA+, and how do their values affect stability and transient response?
To achieve a 3.3V output, two external resistors must be connected between the output, adjustment pin, and ground. Using the formula Vout = 1.25V × (1 + R2/R1), selecting R1 = 240Ω yields R2 ≈ 560Ω for precise 3.3V operation. The compensation capacitor between the output and adjustment pin should be ≥1µF to ensure stability, with lower ESR ceramic capacitors preferred over electrolytic types. Larger output capacitance improves transient response but increases startup time and may require additional soft-start consideration.
Can the MAX603EPA+ safely handle reverse polarity protection without additional external circuitry, and what precautions should be taken during PCB layout?
The MAX603EPA+ includes reverse polarity protection that prevents damage when negative voltage is applied to the input pin. However, this feature only protects against reverse voltage on the IN pin; it does not provide protection for other pins. During layout, maintain adequate spacing from high-current paths, minimize loop areas for input and output capacitors, and place decoupling capacitors within 1cm of the device. Ground plane segmentation near the regulator helps reduce noise coupling into sensitive analog circuits.
How does the enable function of the MAX603EPA+ interact with power sequencing requirements in multi-voltage systems?
The active-high enable pin allows external control of the regulator's operation through a logic-level signal. For proper sequencing, the EN pin should be pulled low before removing power from the input or after shutdown to prevent excessive inrush current. The typical threshold voltages ensure compatibility with both 3.3V and 5V logic families. In battery backup systems, connecting the enable pin to a power-good indicator can create automatic fallback to main supply during brownout conditions.
What is the impact of input voltage ripple on output noise when using the MAX603EPA+ as a precision reference?
While the MAX603EPA+ doesn't specify PSRR values, its internal architecture provides moderate line regulation capability. For applications requiring low-noise references, adding a 10µF ceramic bypass capacitor at the input combined with a ferrite bead can attenuate high-frequency ripple. The 1.25V internal reference offers better stability than resistor-divider-based solutions, but long input traces can couple switching noise into the output. Always use star grounding techniques when sharing return paths between digital and analog sections.
How should thermal derating be calculated for the MAX603EPA+ operating continuously at elevated ambient temperatures?
Continuous operation above room temperature requires derating based on the device's θJA (junction-to-ambient thermal resistance). Without a heatsink, the MAX603EPA+ typically exhibits θJA around 80°C/W in still air. For example, at 60°C ambient, maximum allowable dissipation drops to approximately 0.3W (calculated as (125°C - 60°C)/80°C/W). This translates to reduced output current or higher permissible input-output differential voltage depending on system requirements.
What are the differences between the MAX603EPA+ and substitute parts like the MAX603CPA+ regarding pin compatibility and electrical characteristics?
Both MAX603EPA+ and MAX603CPA+ share identical pinouts and electrical specifications except for operating temperature range. The EPA version operates from -40°C to +85°C, while the CPA variant extends down to -25°C to +100°C. All other parameters—including dropout voltage, quiescent current, and protection features—remain unchanged. Substitute selection depends solely on environmental requirements rather than functional differences.
What considerations apply when replacing the MAX603EPA+ in existing designs with newer regulator families?
When migrating to modern alternatives, verify that replacement devices meet or exceed original performance requirements: input voltage range (±10%), output current capacity (≥500mA), dropout voltage (≤0.6V), and package footprint compatibility. Newer switching regulators may offer superior efficiency but introduce switching noise that could interfere with sensitive loads previously served by the MAX603EPA+. Always perform transient response testing under worst-case load steps.
How does the moisture sensitivity level (MSL) classification of the MAX603EPA+ influence handling procedures for through-hole assemblies?
As an MSL 1 component, the MAX603EPA+ has unlimited shelf life and requires no special drying prior to soldering. Standard IPC/JEDEC Class 3B reflow profiles are acceptable, but prolonged exposure to humid environments (>60% RH) before assembly should be avoided to prevent condensation-induced defects. No post-assembly baking is necessary unless rework involves multiple thermal cycles exceeding recommended limits.
What are the implications of the MAX603EPA+'s EAR99 classification for international sourcing and export compliance?
Designated EAR99, the MAX603EPA+ falls under U.S. Export Administration Regulations general license provisions, simplifying international procurement. However, end-use restrictions still apply, particularly for military, aerospace, or nuclear applications. Suppliers must provide accurate technical data sheets to avoid triggering additional licensing requirements. Always verify supplier authorization status before placing orders from non-U.S. manufacturers.
How can the MAX603EPA+ be used to create a programmable output voltage using external DACs or microcontroller interfaces?
Connecting a DAC output to the ADJ pin enables software-controlled voltage setting. Ensure the DAC output impedance is low enough to drive the feedback network without affecting accuracy—typically <1kΩ. Add a small series resistor (10–100Ω) between DAC and ADJ to dampen any potential oscillations. Limit programming resolution to 10–12 bits due to the 1.25V reference's inherent noise floor, which constrains achievable voltage precision.
What factors determine whether the MAX603EPA+ is suitable for automotive versus industrial temperature applications?
Although rated for -40°C to +85°C, the MAX603EPA+ lacks AEC-Q100 qualification, making it unsuitable for formal automotive applications despite meeting basic temperature specs. Industrial environments with stable thermal cycling may accept it, but vibration resistance and long-term reliability become concerns. For mission-critical systems, consider automotive-grade alternatives with enhanced screening and extended testing protocols.
How does output capacitance selection affect start-up behavior and stability margins in the MAX603EPA+?
Minimum 10µF aluminum electrolytic or tantalum output capacitance is required for stability. Ceramic capacitors alone may cause oscillation due to insufficient phase margin. Large capacitances (>100µF) increase start-up time and inrush current, potentially stressing input sources. If fast turn-on is needed, add a soft-start circuit or use a bypass switch to charge the bulk capacitor gradually.
What modifications are needed to implement current limiting beyond the MAX603EPA+'s built-in overcurrent protection?
The internal OCP triggers at ~750mA and latches off until reset. For adjustable current limiting, insert a sense resistor in series with the load and monitor its voltage drop via comparator. Alternatively, use a foldback current limiter configuration with external transistors. Note that modifying the feedback network alters output regulation accuracy and requires recalibration.
How does the MAX603EPA+'s dropout voltage specification vary across different output voltages and load currents?
Dropout voltage decreases slightly with lower output voltages due to reduced internal bias currents. At 500mA, the 0.55V max applies regardless of output setting between 1.25V and 5V. Below 500mA, dropout drops proportionally—e.g., 0.3V at 300mA. Above 500mA, current saturation occurs, causing increased dropout. Always check absolute maximum ratings when designing near dropout conditions.
What are the consequences of operating the MAX603EPA+ outside its specified input voltage range?
Exceeding the 11.5V maximum input rating risks dielectric breakdown in internal ESD structures, leading to permanent damage even if output appears normal initially. Input voltages below 1.2V prevent proper start-up due to insufficient gate drive. Transient spikes beyond these limits must be clamped externally using TVS diodes or zener regulators to protect the device.
How does the MAX603EPA+ compare to switching regulators in terms of electromagnetic interference (EMI) characteristics for noise-sensitive analog front ends?
Linear regulators like the MAX603EPA+ generate minimal high-frequency EMI compared to switchers, making them ideal for analog subsystems requiring clean power rails. However, they don't suppress conducted emissions as effectively as well-designed buck converters with spread-spectrum modulation. Use π-filters at the output when interfacing with sensitive ADCs or RF circuits, and ensure adequate shielding of nearby high-speed digital traces.

Parts with Similar Specifications

The three parts on the right have similar specifications to Analog Devices Inc./Maxim Integrated MAX603EPA+

Product Attribute MAX603ESA+ MAX603ESA+T MAX603CPA+ MAX603EPA
Part Number MAX603ESA+ MAX603ESA+T MAX603CPA+ MAX603EPA
Manufacturer Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated Analog Devices Inc./Maxim Integrated
Voltage - Input (Max) - - - -
Operating Temperature - -40°C ~ 85°C 0°C ~ 70°C -40°C ~ 85°C
PSRR - - - -
Output Configuration - - - -
Voltage - Output (Min/Fixed) - - - -
Base Product Number - DAC34H84 MAX500 ADS62P42
Package - Tape & Reel (TR) Tube Tape & Reel (TR)
Package / Case - 196-LFBGA 16-DIP (0.300', 7.62mm) 64-VFQFN Exposed Pad
Output Type - Current - Unbuffered Voltage - Buffered -
Voltage - Output (Max) - - - -
Mounting Type - Surface Mount Through Hole Surface Mount
Protection Features - - - -
Control Features - - - -
Voltage Dropout (Max) - - - -
Current - Output - - - -
Series - - - -
Number of Regulators - - - -
Supplier Device Package - 196-NFBGA (12x12) 16-PDIP 64-VQFN (9x9)
Current - Quiescent (Iq) - - - -

MAX603EPA+ Datasheet PDF

Download MAX603EPA+ pdf datasheets and Analog Devices Inc./Maxim Integrated documentation for MAX603EPA+ - Analog Devices Inc./Maxim Integrated.

Datasheets
Cylindrical Battery Holders.pdf
Application Notes
High-Side Current-Sense Measurement: Circuits and .pdf Linear Regulators in Portable Applications.pdf
Environmental Information
Maxim Integrated REACH.pdf Maxim Integrated RoHS Cert.pdf
Part Numbering Guide
Part Numbering System.pdf

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Customer Reviews

Evaluation: 10 Articles

  • Nath***rooks
    Jun 11, 2026

    Installed this power component in a converter board. Output remained stable under different load conditions and thermal performance was better than expected.

  • Dani***alkerTech
    Jun 1, 2026

    Product works, but setup took more effort than expected. Once configured the MCU ran reliably, although documentation support felt older compared with newer platforms. Fine for maintenance projects.

  • Yuki***aka88
    May 26, 2026

    信号通信プロジェクトでこのRS-485トランシーバーを使用しました。設置は簡単で、長距離ケーブルでも通信は安定していました。消費電力も、以前使用していたものより低くなっています。

  • Stev***aker
    May 20, 2026

    Solid diode for power rectification. Works well in switching circuits.

  • Bran***Lewis
    May 11, 2026

    Compact FPGA with good performance. Suitable for basic signal processing tasks.

  • Oliv***arris
    May 7, 2026

    Reliable I/O expander. Works well in embedded control applications.

  • Jess***Jones
    Apr 17, 2026

    It offers good value for the price, and the specifications match the description. I’ve been using it for two days with no issues, and I’ll definitely buy it again if I need it in the future.

  • Mich***Smith
    Apr 17, 2026

    Shipping was on time, the component pins are neatly aligned, and I tested 10 of them with a multimeter—all readings were within the specified range. Highly recommended.

  • Aman***arris
    Apr 3, 2026

    It was great—the entire process, from placing the order to receiving the package, went very smoothly. The components were consistent, the price was fair, and I had a very pleasant shopping experience.

  • Mike***nch
    Apr 3, 2026

    Better than expected! The resistance and capacitance readings were spot-on, and it passed the test on the first try. The service was reliable, and the packaging was thoughtful—I highly recommend it.

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MAX603EPA+ Image

MAX603EPA+

Analog Devices Inc./Maxim Integrated
32D-MAX603EPA+

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