TL317CLPR Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The TL317CLPR is a positive adjustable linear voltage regulator IC rated for 100mA output current in a TO-92-3 through-hole package. This device is classified as Last Time Buy, indicating limited future availability. Finding equivalent and substitute parts is necessary to ensure design continuity and support long-term production requirements.

Key Parameters

Parameter	Value
Manufacturer Part Number	TL317CLPR
Manufacturer	Texas Instruments
Category	Power Management (PMIC)
Output Configuration	Positive
Output Type	Adjustable
Number of Regulators	1
Voltage - Input (Max)	38V
Voltage - Output (Min/Fixed)	1.2V
Voltage - Output (Max)	32V
Current - Output	100mA
PSRR	65dB (120Hz)
Protection Features	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C
Mounting Type	Through Hole
Package / Case	TO-226-3, TO-92-3 (TO-226AA) Formed Leads
RoHS Status	ROHS3 Compliant
REACH Status	REACH Unaffected

Substitute Part Grouping Explanation

Substitution for the TL317CLPR is determined by matching the following critical electrical and mechanical parameters:

Output configuration (Positive)
Output type (Adjustable)
Number of regulators (1)
Maximum input voltage (38V)
Output voltage range (1.2V to 32V)
Output current rating (100mA)
Operating temperature range (0°C ~ 125°C)
Protection features (Over Current, Over Temperature)
RoHS and REACH compliance status

Two substitute parts meet these criteria: the LM317LCDR (MFR Recommended) and the TL317CLPRE3 (Parametric Equivalent). Both maintain identical electrical specifications while differing in package type and product status.

Parameter Comparison

Parameter	TL317CLPR	LM317LCDR	TL317CLPRE3
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments
Category	Power Management (PMIC)	Power Management (PMIC)	Power Management (PMIC)
Output Configuration	Positive	Positive	Positive
Output Type	Adjustable	Adjustable	Adjustable
Number of Regulators	1	1	1
Voltage - Input (Max)	38V	38V	38V
Voltage - Output (Min/Fixed)	1.2V	1.2V	1.2V
Voltage - Output (Max)	32V	32V	32V
Current - Output	100mA	100mA	100mA
PSRR	65dB (120Hz)	80dB ~ 65dB (120Hz)	65dB (120Hz)
Protection Features	Over Current, Over Temperature	Over Current, Over Temperature, Short Circuit	Over Current, Over Temperature
Operating Temperature	0°C ~ 125°C	0°C ~ 125°C	0°C ~ 125°C
Mounting Type	Through Hole	Surface Mount	Through Hole
Package / Case	TO-92-3	8-SOIC	TO-92-3
Product Status	Last Time Buy	Active	Last Time Buy
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

LM317LCDR (MFR Recommended Substitute)

The LM317LCDR is the manufacturer-recommended substitute for the TL317CLPR. This part maintains all critical electrical parameters while offering Active product status, ensuring long-term availability and supply chain stability. The LM317LCDR includes an additional Short Circuit protection feature beyond the base specification. The primary design consideration is the package transition from TO-92-3 through-hole to 8-SOIC surface mount, which requires PCB layout modification. This part is suitable for new designs or redesigns where surface-mount assembly is feasible.

TL317CLPRE3 (Parametric Equivalent)

The TL317CLPRE3 is a parametric equivalent maintaining identical electrical specifications and the same TO-92-3 through-hole package as the original TL317CLPR. This part enables direct board-level substitution without PCB redesign. However, both the original part and this equivalent are classified as Last Time Buy, indicating limited future availability. This option is appropriate for short-term production runs or existing inventory management where package compatibility is critical.

Frequently Asked Questions (FAQ)

Q: Can the LM317LCDR replace the TL317CLPR without circuit modification?

A: The LM317LCDR is electrically equivalent and can replace the TL317CLPR in the circuit design. However, the package change from TO-92-3 to 8-SOIC requires PCB layout modification and assembly process changes. Pin-to-pin correspondence must be verified against the respective datasheets before implementation.

Q: What is the difference between the TL317CLPRE3 and the original TL317CLPR?

A: The TL317CLPRE3 and TL317CLPR are parametrically equivalent with identical electrical specifications and the same TO-92-3 package. Both parts carry Last Time Buy status. The primary difference is inventory availability and manufacturing date codes.

Q: Why does the LM317LCDR show higher PSRR than the TL317CLPR?

A: The LM317LCDR datasheet specifies PSRR as 80dB ~ 65dB (120Hz), indicating a range that includes the 65dB specification of the TL317CLPR. Both parts meet the minimum PSRR requirement of 65dB at 120Hz.

Q: Is the additional Short Circuit protection in the LM317LCDR a compatibility concern?

A: No. The additional Short Circuit protection feature in the LM317LCDR is a functional enhancement that does not affect circuit compatibility. It provides additional device protection without altering the regulator's electrical behavior in normal operation.

Q: Which substitute should be selected for long-term production?

A: The LM317LCDR is recommended for long-term production due to its Active product status. The TL317CLPRE3 and original TL317CLPR are both Last Time Buy parts with limited future availability.

Q: Are all three parts RoHS and REACH compliant?

A: Yes. The TL317CLPR, LM317LCDR, and TL317CLPRE3 are all ROHS3 Compliant and REACH Unaffected, meeting current environmental and regulatory requirements.

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