LM317LBD Linear Voltage Regulator IC Equivalent & Substitute Parts

Part Overview

The LM317LBD is a linear voltage regulator IC manufactured by onsemi, designed for positive adjustable output applications with 100mA current capability in an 8-SOIC surface mount package. This device is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The LM317LBD provides adjustable output voltage regulation from 1.2V to 37V with integrated protection features including over-current, over-temperature, and short-circuit protection.

Substiute Parts

LM317LBD

onsemiIn Stock: 4228LM317LBD Datasheet

Current PartRFQ

LM317LD13TR

STMicroelectronicsIn Stock: 886604LM317LD13TR Datasheet

DirectRFQ

LM217LD13TR

STMicroelectronicsIn Stock: 40567LM217LD13TR Datasheet

SimilarRFQ

LM317LID

Texas InstrumentsIn Stock: 2081LM317LID Datasheet

SimilarRFQ

TL317CD

Texas InstrumentsIn Stock: 6520TL317CD Datasheet

SimilarRFQ

LM317LM/NOPB

Texas InstrumentsIn Stock: 35198LM317LM/NOPB Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM317LBD is determined by the following critical parameters:

Electrical Compatibility Requirements:

• Output configuration: Positive adjustable
• Output voltage range: 1.2V minimum to 37V maximum
• Output current: 100mA
• Input voltage maximum: 40V
• Package type: 8-SOIC surface mount
• Protection features: Over-current, over-temperature, and short-circuit protection

Substitution Categories:

Direct Manufacturer Equivalent: Parts that match all electrical specifications and package requirements with active product status and modern compliance certifications.

Similar Functional Equivalent: Parts that meet core electrical specifications but may have minor parameter variations (such as reduced maximum input voltage, lower maximum output voltage, or different quiescent current) while maintaining functional compatibility in most applications.

Parametric Equivalent: Parts that provide identical electrical performance and specifications to the original part but from different manufacturers, with active product status and full compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: LM317LD13TR (STMicroelectronics)

The LM317LD13TR is the direct manufacturer equivalent with active product status. It matches all electrical specifications of the LM317LBD including 40V maximum input voltage, 37V maximum output voltage, and 100mA output current. This part carries ROHS3 compliance certification and maintains full compatibility with existing designs. Inventory availability is substantial at 886,524 pieces.

Secondary Recommendation: LM317LM/NOPB (Texas Instruments)

The LM317LM/NOPB provides parametric equivalence with identical electrical specifications to the original LM317LBD. This part is actively manufactured with ROHS3 compliance and offers the same 40V input maximum and 37V output maximum. Current inventory is 35,100 pieces. This option is suitable for designs requiring Texas Instruments sourcing or supply chain diversification.

Alternative for Extended Temperature Range: LM217LD13TR (STMicroelectronics)

The LM217LD13TR maintains the full -40°C to 125°C operating temperature range and supports 40V input and 37V output specifications. However, this part does not specify over-current protection, only over-temperature and short-circuit protection. This part is suitable only for applications where over-current protection is not critical. Active product status with 40,496 pieces in inventory.

Not Recommended for New Designs: LM317LID and TL317CD (Texas Instruments)

Both parts carry Last Time Buy status, indicating discontinued production. Additionally, both are limited to 38V maximum input voltage and 32V maximum output voltage, reducing design flexibility. These parts should be avoided for new production unless existing inventory is specifically required for legacy system support.

Frequently Asked Questions (FAQ)

Q: Can I directly replace LM317LBD with LM317LD13TR in my existing design?

A: Yes. The LM317LD13TR is a direct equivalent with identical electrical specifications, package type, and pin configuration. No circuit modifications are required. The part is pin-compatible and functionally equivalent for all applications where the LM317LBD was used.

Q: What is the difference between LM317LD13TR and LM217LD13TR?

A: Both parts are manufactured by STMicroelectronics in the same 8-SOIC package with identical voltage specifications. The primary difference is that LM217LD13TR does not include over-current protection, providing only over-temperature and short-circuit protection. Select LM317LD13TR if over-current protection is required in your application.

Q: Why do LM317LID and TL317CD have lower maximum output voltage (32V vs 37V)?

A: These are design variants with different internal specifications. While they function as adjustable regulators, their maximum output voltage is limited to 32V compared to 37V for the LM317LBD. Applications requiring output voltages above 32V must use LM317LD13TR or LM317LM/NOPB.

Q: Is the LM317LBD still available for purchase?

A: The LM317LBD is classified as obsolete. While 4,140 pieces are reported in inventory, new production has ceased. For ongoing production requirements, transition to LM317LD13TR or LM317LM/NOPB, both of which are actively manufactured.

Q: What is the impact of RoHS compliance on my design?

A: The original LM317LBD is RoHS non-compliant. All recommended substitutes (LM317LD13TR, LM217LD13TR, LM317LID, TL317CD, and LM317LM/NOPB) are ROHS3 compliant. If your application or end-market requires RoHS compliance, any of these substitutes will satisfy regulatory requirements.

Q: Does quiescent current difference affect my circuit design?

A: The LM317LBD has 10mA quiescent current, while LM317LD13TR has 5mA and LM317LID has 2.5mA. Lower quiescent current reduces standby power consumption. If your design is sensitive to quiescent current, LM317LID offers the lowest value. For most applications, this difference is not critical, but it should be evaluated in low-power or battery-powered designs.

Q: Can I use these parts interchangeably in production?

A: Yes, within the constraints of their specifications. LM317LD13TR and LM317LM/NOPB are fully interchangeable with the LM317LBD. LM217LD13TR can be used if over-current protection is not required. LM317LID and TL317CD should only be used if your application does not require output voltages above 32V and can operate within their temperature ranges.