NJM317F Linear Voltage Regulator Equivalent & Substitute Parts

Part Overview

The NJM317F is a linear voltage regulator IC manufactured by Nisshinbo Micro Devices Inc., designed for positive adjustable output applications with 1.5A current capability in a TO-220-3 Full Pack configuration. This device operates across an input voltage range of up to 40V and provides adjustable output from 1.25V to 37V, making it suitable for general-purpose power supply and voltage regulation applications.

The NJM317F carries an Obsolete product status. Locating equivalent substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support ongoing production or maintenance requirements for systems utilizing this regulator.

Substiute Parts

NJM317F

Nisshinbo Micro Devices Inc.In Stock: 63127NJM317F Datasheet

Current PartRFQ

LM317KCS

Texas InstrumentsIn Stock: 2286LM317KCS Datasheet

DirectRFQ

LM317P

STMicroelectronicsIn Stock: 2919LM317P Datasheet

DirectRFQ

LD1085P

STMicroelectronicsIn Stock: 2298LD1085P Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the NJM317F are classified based on strict electrical and mechanical parameter alignment. The substitution logic is determined by the following critical parameters:

Primary Substitution Criteria:

• Output Configuration: Positive
• Output Type: Adjustable
• Number of Regulators: 1
• Voltage - Input (Max): 40V
• Voltage - Output (Min/Fixed): 1.25V or compatible
• Voltage - Output (Max): 37V or compatible
• Current - Output: 1.5A (minimum requirement)
• Mounting Type: Through Hole
• Package / Case: TO-220-3 or TO-220-3 Full Pack

Direct Substitutes (LM317KCS, LM317P) meet all primary electrical specifications and package requirements with identical or superior performance characteristics and Active product status.

Similar Substitute (LD1085P) provides higher current capability (3A) and lower maximum input voltage (30V), suitable for applications where the reduced input voltage range is acceptable and higher current capacity is beneficial.

Parameter Comparison

Engineering Selection Recommendations

LM317KCS (Texas Instruments) is the primary direct substitute for the NJM317F. This part maintains identical electrical specifications across all critical parameters: 40V maximum input voltage, 1.25V to 37V adjustable output range, and 1.5A output current. The LM317KCS carries Active product status, ensuring long-term availability and supply chain stability. It is ROHS3 Compliant and REACH Unaffected. The device includes enhanced protection features (Over Current, Over Temperature, Short Circuit) compared to the NJM317F. Operating temperature range extends to 125°C maximum, providing broader thermal operating capability.

LM317P (STMicroelectronics) is an alternative direct substitute with identical electrical performance to the NJM317F. This part also maintains 40V maximum input voltage, 1.25V to 37V output range, and 1.5A output current. The LM317P is Active status and ROHS3 Compliant. The minimum output voltage is specified at 1.2V, which is compatible with the NJM317F's 1.25V specification. Like the LM317KCS, it includes comprehensive protection features and operates to 125°C maximum.

LD1085P (STMicroelectronics) is a similar substitute suitable for applications where higher output current (3A) is required. However, this part has a reduced maximum input voltage of 30V compared to the NJM317F's 40V specification, and maximum output voltage is limited to 28.5V versus 37V. The LD1085P is Obsolete status. Selection of this part requires verification that the application's input voltage does not exceed 30V and output voltage requirements do not exceed 28.5V.

All substitute parts are Through Hole mounted in TO-220-3 or TO-220-3 Full Pack configurations, maintaining mechanical compatibility with the NJM317F footprint.

Frequently Asked Questions (FAQ)

Q: Can the LM317KCS directly replace the NJM317F without circuit modifications?

A: Yes. The LM317KCS maintains identical electrical specifications for voltage input/output ranges, output current, and PSRR characteristics. Both devices are adjustable positive linear regulators in TO-220-3 package configuration. No circuit modifications are required for direct substitution.

Q: What is the difference between LM317KCS and LM317P?

A: Both parts are direct electrical equivalents of the NJM317F with identical 40V input, 1.25V to 37V output, and 1.5A current specifications. The primary difference is manufacturer: LM317KCS is from Texas Instruments, while LM317P is from STMicroelectronics. Both are Active status and ROHS3 Compliant. Selection between them depends on supplier availability and procurement preferences.

Q: Why is the LD1085P listed as a similar substitute rather than a direct substitute?

A: The LD1085P differs in two critical electrical parameters. Maximum input voltage is 30V versus the NJM317F's 40V, and maximum output voltage is 28.5V versus 37V. While the LD1085P provides higher output current (3A), these voltage limitations restrict its use to applications operating within these reduced ranges. It is classified as a similar substitute for applications where these voltage constraints are acceptable.

Q: Are all substitute parts RoHS compliant?

A: Yes. The NJM317F is RoHS Compliant. All substitute parts (LM317KCS, LM317P, LD1085P) are ROHS3 Compliant, meeting current RoHS requirements. All parts are REACH Unaffected.

Q: What protection features does the NJM317F have compared to the substitutes?

A: The NJM317F specifications do not list explicit protection features. The LM317KCS and LM317P both include Over Current, Over Temperature, and Short Circuit protection. The LD1085P includes Over Current and Over Temperature protection. These enhanced protection features in the substitutes provide additional circuit safeguarding.

Q: Can I use the LD1085P in a circuit designed for the NJM317F?

A: Only if the circuit's maximum input voltage does not exceed 30V and maximum output voltage requirement does not exceed 28.5V. The LD1085P's higher current capability (3A) is compatible with applications requiring 1.5A or less. Verify input and output voltage specifications before selection.

Q: What is the operating temperature range difference between the NJM317F and substitutes?

A: The NJM317F operates from -40°C to 85°C. The LM317KCS and LM317P extend the upper limit to 125°C. The LD1085P operates from -40°C to 125°C. For applications requiring operation above 85°C, the substitute parts provide extended thermal capability.

Q: Are the package configurations identical between all parts?

A: The NJM317F, LM317P, and LD1085P use TO-220-3 Full Pack configuration. The LM317KCS uses TO-220-3 configuration. Both configurations are mechanically compatible for Through Hole mounting and provide identical pinout. No PCB layout modifications are required.