LM5008SD Equivalent & Substitute Parts

Part Overview

The LM5008SD is a buck switching regulator IC from Texas Instruments designed for step-down voltage conversion with positive adjustable output. It delivers 350mA output current across an input voltage range of 9.5V to 95V, with adjustable output voltage from 2.5V to 75V. The device operates at switching frequencies between 50kHz and 600kHz and is housed in an 8-WDFN exposed pad surface mount package.

The LM5008SD carries a Last Time Buy product status, indicating it has been discontinued and is no longer recommended for new designs. This status necessitates identification of equivalent and substitute parts for ongoing production support and new design implementations.

Substiute Parts

LM5008SD

Texas InstrumentsIn Stock: 2317LM5008SD Datasheet

Current PartRFQ

LM5008SDC/NOPB

Texas InstrumentsIn Stock: 27565LM5008SDC/NOPB Datasheet

MFR RecommendedRFQ

LM5163DDAR

Texas InstrumentsIn Stock: 40509LM5163DDAR Datasheet

MFR RecommendedRFQ

LM25007SD/NOPB

Texas InstrumentsIn Stock: 4314LM25007SD/NOPB Datasheet

MFR RecommendedRFQ

LM5009SDC/NOPB

Texas InstrumentsIn Stock: 32158LM5009SDC/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM5008SD is determined by alignment across the following critical parameters: buck topology, positive adjustable output configuration, single output, input voltage range compatibility (minimum 9.5V, maximum 95V), output voltage range (minimum 2.5V, maximum 75V), output current capability (minimum 350mA), surface mount package type, and compliance certifications (ROHS3, REACH Unaffected).

The substitute parts are grouped into two categories:

Direct Equivalents (Same Package, Same Output Current): Parts maintaining the 8-WDFN package and 350mA output current specification.

Functional Alternatives (Different Package or Enhanced Specifications): Parts with different packages or output current ratings that satisfy the core buck regulator function within the specified voltage and current parameters.

Parameter Comparison

Engineering Selection Recommendations

LM5008SDC/NOPB is the primary recommended substitute. It maintains identical electrical specifications (350mA output current, 9.5V to 95V input range, 2.5V to 75V output range) and package configuration (8-WDFN exposed pad) as the LM5008SD. The device carries Active product status, ensuring long-term availability and design support. This part provides direct functional equivalence with no design modifications required.

LM25007SD/NOPB serves as an alternative for applications where input voltage does not exceed 42V and output voltage remains below 37V. It delivers 500mA output current in the same 8-WDFN package, providing enhanced current capability within its specified voltage envelope. This part is suitable for designs operating within its voltage constraints and is in Active product status.

LM5163DDAR is applicable for designs requiring higher output current (500mA) and extended operating temperature range (-40°C to 150°C). It features a synchronous rectifier for improved efficiency and operates at 1MHz switching frequency. The device uses an 8-PowerSOIC package, requiring PCB layout modifications. Input voltage range extends to 100V maximum, and output voltage range extends to 100V maximum. This part is in Active product status.

LM5009SDC/NOPB is not recommended for new designs due to its Not For New Designs product status. While it maintains the same package and voltage specifications as the LM5008SD, its lower 150mA output current makes it unsuitable as a direct substitute for 350mA applications. This part should be used only for legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can LM5008SDC/NOPB directly replace LM5008SD without PCB modifications?

A: Yes. LM5008SDC/NOPB is electrically and mechanically identical to LM5008SD. Both use the 8-WDFN exposed pad package with the same pinout, electrical ratings, and performance characteristics. No design changes are required.

Q: What are the key differences between LM5008SD and LM5163DDAR?

A: LM5163DDAR differs in three primary areas: package type (8-PowerSOIC versus 8-WDFN), output current (500mA versus 350mA), and switching frequency (1MHz versus 50kHz-600kHz). LM5163DDAR includes a synchronous rectifier and supports higher operating temperatures (150°C versus 125°C). PCB layout modifications are necessary for package substitution.

Q: Is LM25007SD/NOPB suitable for all LM5008SD applications?

A: LM25007SD/NOPB is suitable only for applications where input voltage does not exceed 42V and output voltage remains below 37V. The LM5008SD supports input voltages up to 95V and output voltages up to 75V. Verify your application's voltage requirements before substitution.

Q: Why is LM5009SDC/NOPB listed as a substitute if it has lower output current?

A: LM5009SDC/NOPB is listed as a historical substitute reference but is not recommended for new designs or as a replacement for 350mA applications. Its 150mA output current rating is insufficient for LM5008SD equivalence. It is included for legacy system documentation only.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed (LM5008SDC/NOPB, LM5163DDAR, LM25007SD/NOPB, and LM5009SDC/NOPB) are ROHS3 compliant and REACH unaffected, matching the LM5008SD compliance profile.

Q: Does switching frequency affect part substitution?

A: Switching frequency differences do not prevent substitution if all other electrical parameters align. However, higher switching frequencies (LM5163DDAR at 1MHz, LM25007SD/NOPB up to 800kHz) may require different filter component values and PCB layout considerations compared to the LM5008SD's 50kHz-600kHz range.