FAN1117AT Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The FAN1117AT is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications requiring 1A current capacity in a TO-220-3 package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The FAN1117AT provides adjustable output voltage regulation from 1.25V to 18V with integrated over-current and over-temperature protection.

Substiute Parts

FAN1117AT

onsemiIn Stock: 7118FAN1117AT Datasheet

Current PartRFQ

LM1117T-ADJ/NOPB

Texas InstrumentsIn Stock: 3143LM1117T-ADJ/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FAN1117AT are identified based on the following critical parameters that determine functional equivalence:

• Package Compatibility: TO-220-3 through-hole mounting
• Output Configuration: Positive adjustable voltage regulation
• Voltage Range: Minimum output 1.25V, maximum output capability
• Current Capacity: Output current rating of 800mA or higher
• Voltage Dropout: Maximum 1.2V specification
• Protection Features: Over-current and over-temperature protection
• Operating Temperature Range: 0°C to 125°C
• PSRR Performance: 72dB or higher at 120Hz

The LM1117T-ADJ/NOPB from Texas Instruments meets these substitution criteria with compatible electrical and mechanical specifications.

Parameter Comparison

Engineering Selection Recommendations

The LM1117T-ADJ/NOPB is a direct functional substitute for the FAN1117AT with the following considerations:

Advantages of LM1117T-ADJ/NOPB:

• Active product status ensures long-term availability and supply chain continuity
• ROHS3 compliance provides environmental and regulatory alignment
• Identical minimum output voltage (1.25V) and adjustable range capability
• Superior PSRR performance (75dB vs 72dB at 120Hz)
• Identical dropout voltage specification at rated current

Design Considerations:

• Output current rating is 800mA versus 1A on the FAN1117AT; applications requiring full 1A continuous output must be evaluated against actual load requirements
• Maximum input voltage is 15V versus 18V; circuits operating above 15V input require design modification
• Maximum output voltage is 13.8V versus 18V; high-voltage output applications require alternative solutions

Both devices share identical TO-220-3 pinout, operating temperature range, and protection feature sets, enabling direct PCB replacement with potential circuit parameter adjustments based on the noted electrical differences.

Frequently Asked Questions (FAQ)

Q: Can the LM1117T-ADJ/NOPB directly replace the FAN1117AT without PCB modifications?

A: Physical pinout compatibility is identical (TO-220-3), allowing direct socket replacement. However, circuit design review is required if applications depend on the 1A output current rating or 18V maximum input voltage specification of the original FAN1117AT.

Q: What is the impact of the 800mA versus 1A current rating difference?

A: The LM1117T-ADJ/NOPB is rated for 800mA continuous output. Applications drawing sustained currents above 800mA will exceed the substitute part's specification. Load current analysis is necessary to confirm compatibility.

Q: Are there packaging differences between these parts?

A: Both devices use TO-220-3 through-hole packaging. The FAN1117AT is supplied in standard packaging, while the LM1117T-ADJ/NOPB is supplied in tube packaging. This does not affect electrical performance or PCB mounting.

Q: What compliance certifications apply to the LM1117T-ADJ/NOPB?

A: The LM1117T-ADJ/NOPB is ROHS3 compliant and REACH unaffected. Both devices carry EAR99 ECCN classification and identical HTSUS codes (8542.39.0001).

Q: Can the FAN1117AT be used in new designs?

A: The FAN1117AT is classified as obsolete. New designs should specify the LM1117T-ADJ/NOPB or equivalent active-status alternatives to ensure long-term component availability and supply chain reliability.

Q: What is the minimum output voltage for both regulators?

A: Both the FAN1117AT and LM1117T-ADJ/NOPB support adjustable output voltage with a minimum of 1.25V, determined by the internal reference voltage and external resistor divider network.