AP1117T50L-U Equivalent & Substitute Parts

Part Overview

The AP1117T50L-U is a linear voltage regulator IC manufactured by Diodes Incorporated, designed to provide a fixed 5V output at 1A maximum current in a TO-220-3 package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The AP1117T50L-U serves applications requiring positive fixed voltage regulation with integrated over-current and over-temperature protection.

Substiute Parts

AP1117T50L-U

Diodes IncorporatedIn Stock: 2495AP1117T50L-U Datasheet

Current PartRFQ

LD1117V50

STMicroelectronicsIn Stock: 2227LD1117V50 Datasheet

MFR RecommendedRFQ

LD1117V50C

STMicroelectronicsIn Stock: 47245LD1117V50C Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the AP1117T50L-U is determined by the following critical parameters:

• Output Voltage: Fixed 5V output (non-negotiable)
• Output Current: Minimum 800mA capability (AP1117T50L-U rated at 1A)
• Package Type: TO-220-3 through-hole mounting
• Output Configuration: Positive fixed regulator
• Protection Features: Over-current and over-temperature protection
• Compliance: ROHS3 compliant, REACH unaffected

The substitute parts LD1117V50 and LD1117V50C from STMicroelectronics meet these criteria. Both devices provide 5V fixed output with 800mA current capability in TO-220-3 packages. While output current is reduced from 1A to 800mA, both substitutes maintain functional equivalence for applications within the 800mA limit. Voltage dropout characteristics and PSRR specifications differ slightly but remain within acceptable ranges for linear regulator applications.

Parameter Comparison

Engineering Selection Recommendations

Both LD1117V50 and LD1117V50C are valid substitutes for the AP1117T50L-U based on compliance and product status alignment. Selection between them depends on application temperature requirements:

LD1117V50C is preferred for applications requiring extended low-temperature operation, as it supports -40°C to 125°C versus the 0°C to 125°C range of LD1117V50. Both devices maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory continuity.

The primary design consideration is output current capacity. Applications drawing sustained currents above 800mA require alternative regulators with higher current ratings, as both substitutes are limited to 800mA maximum output.

Frequently Asked Questions (FAQ)

Q: Can LD1117V50 or LD1117V50C directly replace AP1117T50L-U in existing designs?

A: Direct replacement is possible for applications operating within 800mA output current limits. Pin configuration and TO-220-3 package are identical. No PCB modifications are required. Applications exceeding 800mA require alternative regulators.

Q: What is the difference between LD1117V50 and LD1117V50C?

A: Both devices provide identical 5V output and 800mA current capability. The primary difference is operating temperature range: LD1117V50 operates 0°C to 125°C, while LD1117V50C operates -40°C to 125°C. LD1117V50C is suitable for extended low-temperature applications.

Q: Why is the output current reduced from 1A to 800mA in the substitutes?

A: The LD1117 series is rated at 800mA maximum output current, compared to the AP1117T50L-U at 1A. This is a device characteristic difference between manufacturers. Applications requiring 1A output must use alternative regulators.

Q: Are there package or pinout differences between these devices?

A: All three devices use TO-220-3 through-hole packages with identical pinout. No package conversion or PCB rework is necessary for substitution.

Q: Do the substitutes maintain the same protection features?

A: Yes. Both LD1117V50 and LD1117V50C include over-current and over-temperature protection, matching the AP1117T50L-U protection feature set.