RC1117M Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The RC1117M is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications with 1A current capacity in a TO-263-3 surface mount package. This device is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The RC1117M provides adjustable output voltage regulation from 1.25V to 6.3V with integrated over-current and over-temperature protection, suitable for general-purpose power management applications requiring moderate current delivery.

Substiute Parts

RC1117M

onsemiIn Stock: 2511RC1117M Datasheet

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LM1117S-ADJ/NOPB

Texas InstrumentsIn Stock: 6403LM1117S-ADJ/NOPB Datasheet

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LM1117SX-ADJ/NOPB

Texas InstrumentsIn Stock: 360429LM1117SX-ADJ/NOPB Datasheet

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LT1117CM#PBF

Analog Devices Inc.In Stock: 4140LT1117CM#PBF Datasheet

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LT1117CM#TRPBF

Analog Devices Inc.In Stock: 1380LT1117CM#TRPBF Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RC1117M is determined by the following critical parameters that must remain compatible:

• Output configuration (positive adjustable)
• Output voltage range (minimum 1.25V, maximum ≥6.3V)
• Output current capability (minimum 1A)
• Dropout voltage specification (≤1.2V @ rated current)
• Package type (TO-263-3 / DDPAK-3 surface mount)
• Operating temperature range (0°C to 125°C)
• Protection features (over-current and over-temperature)

The substitute parts identified—LM1117S-ADJ/NOPB, LM1117SX-ADJ/NOPB, LT1117CM#PBF, and LT1117CM#TRPBF—meet these core electrical and mechanical requirements. All substitutes maintain the same output voltage adjustment range, identical package footprint, and equivalent thermal protection. The primary differences are manufacturer origin (Texas Instruments or Analog Devices), output current rating (800mA vs. 1A), and packaging format (tube, cut tape, or tape & reel).

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts are actively manufactured and maintain full compliance with REACH and EAR99 export classifications. The Texas Instruments LM1117 series (LM1117S-ADJ/NOPB and LM1117SX-ADJ/NOPB) are ROHS3 compliant with higher input voltage tolerance (15V maximum) and are available in high inventory quantities. The Analog Devices LT1117CM series (both #PBF and #TRPBF variants) offer unlimited moisture sensitivity rating (MSL 1) matching the original RC1117M specification, with active product status and ROHS3 compliance.

Selection between substitutes depends on application requirements: if the design operates below 7.5V input and requires 1A output current, the RC1117M specifications are more closely matched by the LT1117 series due to identical MSL rating. If higher input voltage tolerance or maximum inventory availability is prioritized, the LM1117 series from Texas Instruments provides suitable alternatives with equivalent electrical performance at 800mA output current.

Frequently Asked Questions (FAQ)

Q: Can LM1117S-ADJ/NOPB or LM1117SX-ADJ/NOPB directly replace RC1117M in existing designs?

A: Both LM1117 variants are electrically compatible for applications requiring ≤800mA output current. The identical TO-263-3 package footprint ensures mechanical compatibility. If the original design requires the full 1A output capability of the RC1117M, load current must be verified to remain below 800mA for reliable operation with these substitutes.

Q: What is the difference between LM1117S-ADJ/NOPB and LM1117SX-ADJ/NOPB?

A: Both parts are functionally identical with matching electrical specifications. The primary difference is packaging format: LM1117S-ADJ/NOPB is supplied in tube packaging, while LM1117SX-ADJ/NOPB is supplied in cut tape and digi-reel format. Selection depends on procurement and assembly requirements.

Q: Why do the LT1117CM variants show lower protection features than the RC1117M?

A: The LT1117CM#PBF and LT1117CM#TRPBF datasheets specify over-temperature protection. Over-current protection is inherent to the LT1117 design architecture but may not be explicitly listed in the provided specification data. Consult manufacturer datasheets for complete protection feature confirmation.

Q: Are there differences in moisture sensitivity between substitute options?

A: Yes. The LT1117CM#PBF and LT1117CM#TRPBF maintain MSL 1 (unlimited) rating identical to the RC1117M. The LM1117 series carries MSL 3 (168 hours), requiring controlled storage and handling during assembly. For applications with extended shelf life or high-humidity environments, the LT1117 variants are preferred.

Q: Can I use these substitutes if my design requires input voltages above 7.5V?

A: Yes. All substitute parts support maximum input voltage of 15V, providing greater design margin than the original RC1117M. This expanded input voltage range is a functional advantage for new designs.

Q: What is the inventory status of these substitute parts?

A: LM1117SX-ADJ/NOPB has the highest availability (360,400 pcs). LM1117S-ADJ/NOPB (6,364 pcs), LT1117CM#PBF (4,078 pcs), and LT1117CM#TRPBF (1,287 pcs) are all in active stock. The original RC1117M has 2,484 pcs available but is obsolete.