LM334M Equivalent & Substitute Parts

Part Overview

The LM334M is a current source regulator IC manufactured by Texas Instruments in an 8-SOIC surface mount package. This adjustable current source device operates across a 1V to 40V input voltage range with ±6% accuracy and is classified as a Power Management (PMIC) component. The LM334M is currently in Last Time Buy status, making identification of equivalent and substitute parts essential for ongoing design support and procurement planning. Substitute parts are necessary to ensure design continuity, maintain supply chain flexibility, and support long-term product availability.

Substiute Parts

LM334M

Texas InstrumentsIn Stock: 3224LM334M Datasheet

Current PartRFQ

LM334M/NOPB

Texas InstrumentsIn Stock: 26600LM334M/NOPB Datasheet

DirectRFQ

LM334SM/NOPB

Texas InstrumentsIn Stock: 40359LM334SM/NOPB Datasheet

Parametric EquivalentRFQ

LM334DT

STMicroelectronicsIn Stock: 12876LM334DT Datasheet

MFR RecommendedRFQ

LM334S8#PBF

Analog Devices Inc.In Stock: 1754LM334S8#PBF Datasheet

MFR RecommendedRFQ

LM334S8#TRPBF

Analog Devices Inc.In Stock: 753LM334S8#TRPBF Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the LM334M is determined by the following critical parameters: identical package type (8-SOIC), compatible input voltage range (1V ~ 40V minimum), surface mount mounting type, and compliance certifications (ROHS3, REACH Unaffected, EAR99). The substitute parts are grouped into two categories:

Direct Manufacturer Equivalents maintain identical electrical specifications (±6% accuracy, adjustable output current) and are sourced from the same manufacturer (Texas Instruments). These parts differ only in packaging format (Tube vs. alternative designations) and product status (Active vs. Last Time Buy).

Manufacturer-Recommended Alternatives include parts from STMicroelectronics and Analog Devices Inc. that share the same base product number (LM334) and package footprint but may have different accuracy specifications (±3% for STMicroelectronics LM334DT) or fixed output current ratings (10mA for Analog Devices variants). These alternatives maintain electrical compatibility through the same 8-SOIC package and input voltage range while offering enhanced performance characteristics or different output configurations.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Performance): LM334M/NOPB and LM334SM/NOPB are the primary substitutes, both manufactured by Texas Instruments with Active product status. These parts maintain the ±6% accuracy specification and adjustable output current configuration of the original LM334M. LM334M/NOPB offers the highest inventory availability (26,555 units) and is recommended as the first choice for procurement. LM334SM/NOPB provides the largest available stock (40,300 units) and represents the most secure long-term supply option.

For Enhanced Performance Applications: LM334DT from STMicroelectronics provides improved accuracy (±3% vs. ±6%) while maintaining the same 8-SOIC package and 1V ~ 40V input voltage range. This part is suitable for applications requiring tighter current source regulation. However, the fixed 10mA output current differs from the adjustable output of the LM334M, requiring circuit design verification.

For Alternative Sourcing: LM334S8#PBF and LM334S8#TRPBF from Analog Devices Inc. are functionally compatible alternatives with fixed 10mA output current and extended lower input voltage limit (0.8V vs. 1V). These parts are available in Tube and Tape & Reel packaging formats respectively. Inventory levels are lower (1,729 and 670 units), making these options suitable for secondary sourcing strategies.

Compliance Considerations: All substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 classification, ensuring regulatory compatibility with the original LM334M specification.

Frequently Asked Questions (FAQ)

Q: Can LM334M/NOPB be used as a direct drop-in replacement for LM334M? A: Yes. LM334M/NOPB is electrically and mechanically identical to LM334M, differing only in product status (Active vs. Last Time Buy) and packaging designation. Both maintain ±6% accuracy, adjustable output current, and 8-SOIC package specifications.

Q: What is the difference between LM334M/NOPB and LM334SM/NOPB? A: Both parts are Texas Instruments current source regulators with identical electrical specifications (±6% accuracy, adjustable output, 1V ~ 40V input range) and 8-SOIC packaging. The primary difference is inventory availability, with LM334SM/NOPB offering significantly higher stock levels (40,300 vs. 26,555 units).

Q: Can LM334DT from STMicroelectronics replace LM334M in all applications? A: LM334DT is mechanically compatible (same 8-SOIC package) and maintains the 1V ~ 40V input voltage range. However, it features fixed 10mA output current instead of adjustable output and offers improved ±3% accuracy. Circuit design verification is required to confirm compatibility with applications requiring adjustable current output.

Q: What are the packaging differences between the substitute parts? A: LM334M/NOPB and LM334SM/NOPB are supplied in Tube packaging. LM334DT is available in Cut Tape (CT) & Digi-Reel format. LM334S8#PBF is supplied in Tube, while LM334S8#TRPBF is supplied in Tape & Reel (TR) format. All parts use the same 8-SOIC footprint.

Q: Are Analog Devices LM334S8 variants suitable for designs requiring adjustable current output? A: No. LM334S8#PBF and LM334S8#TRPBF feature fixed 10mA output current. These parts are suitable only for applications with fixed current source requirements. For adjustable output current, use Texas Instruments LM334M/NOPB or LM334SM/NOPB.

Q: What is the minimum input voltage for each substitute part? A: Texas Instruments variants (LM334M, LM334M/NOPB, LM334SM/NOPB) and STMicroelectronics LM334DT operate from 1V minimum input. Analog Devices variants (LM334S8#PBF, LM334S8#TRPBF) operate from 0.8V minimum input, providing extended low-voltage capability.

Q: Do all substitute parts meet the same compliance standards as LM334M? A: Yes. All listed substitute parts maintain ROHS3 compliance, REACH Unaffected status, and EAR99 classification, ensuring regulatory equivalence with the original LM334M specification.