TL317CPWR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The TL317CPWR is a linear voltage regulator IC from Texas Instruments designed for positive adjustable output applications. It delivers 100mA output current with an adjustable voltage range from 1.2V to 32V, making it suitable for general-purpose power management circuits. The device is classified as Last Time Buy, indicating end-of-life status. Finding equivalent substitute parts is necessary to ensure design continuity and maintain supply chain reliability for new production runs and long-term support.

Substiute Parts

TL317CPWR

Texas InstrumentsIn Stock: 1466TL317CPWR Datasheet

Current PartRFQ

LM317LCDR

Texas InstrumentsIn Stock: 2782LM317LCDR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TL317CPWR is determined by the following critical parameters:

• Output configuration (Positive) and output type (Adjustable)
• Output voltage range capability (1.2V to 32V minimum)
• Maximum input voltage rating (38V minimum)
• Output current capacity (100mA minimum)
• Operating temperature range (0°C to 125°C minimum)
• Regulatory compliance (ROHS3 Compliant, REACH Unaffected)
• Moisture sensitivity level (MSL 1 or better)

The LM317LCDR qualifies as a direct substitute based on matching all critical electrical parameters and compliance requirements. The primary difference is the package type: LM317LCDR uses 8-SOIC (0.154", 3.90mm Width) versus the original 8-TSSOP package. Both packages are surface-mount and functionally equivalent for circuit operation.

Parameter Comparison

Engineering Selection Recommendations

The LM317LCDR is the manufacturer-recommended substitute for the TL317CPWR. Both devices maintain identical electrical specifications across all critical parameters including voltage ratings, output current, and operating temperature range. Both are ROHS3 compliant and REACH unaffected, ensuring regulatory compliance for current and future production.

The LM317LCDR offers enhanced protection features with the addition of short-circuit protection beyond the over-current and over-temperature protection of the original part. The PSRR specification of the LM317LCDR (80dB ~ 65dB at 120Hz) meets or exceeds the TL317CPWR requirement.

The primary design consideration is the package change from 8-TSSOP to 8-SOIC. This requires PCB layout modification to accommodate the different pin pitch and package dimensions. The LM317LCDR is currently in Active product status with higher inventory availability (2754 Pcs), compared to the Last Time Buy status of the TL317CPWR.

Frequently Asked Questions (FAQ)

Q: Can the LM317LCDR be used as a direct pin-for-pin replacement?

A: The LM317LCDR is functionally equivalent but not a pin-for-pin replacement due to package differences. The 8-TSSOP and 8-SOIC packages have different physical dimensions and pin layouts. PCB redesign is required to accommodate the LM317LCDR package.

Q: What are the key electrical differences between TL317CPWR and LM317LCDR?

A: There are no significant electrical differences. Both devices deliver 100mA output current with adjustable voltage from 1.2V to 32V, support 38V maximum input voltage, and operate across 0°C to 125°C. The LM317LCDR includes additional short-circuit protection.

Q: Are both parts compliant with current environmental regulations?

A: Yes. Both the TL317CPWR and LM317LCDR are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the TL317CPWR marked as Last Time Buy?

A: Last Time Buy status indicates the manufacturer is discontinuing this product. The LM317LCDR represents the active alternative for continued design support and production availability.

Q: What is the impact of the package change on circuit performance?

A: The package change from 8-TSSOP to 8-SOIC does not affect electrical performance. Both are surface-mount packages with identical pin functionality. Layout and thermal considerations may differ slightly due to package dimensions.

Q: Is inventory availability a factor in selecting the substitute?

A: Yes. The LM317LCDR has significantly higher inventory (2754 Pcs) compared to the TL317CPWR (1400 Pcs), providing better supply chain security for ongoing production.