LM334SM Equivalent & Substitute Parts

Part Overview

The LM334SM is a current source regulator IC manufactured by Texas Instruments, designed for adjustable current source applications in power management circuits. This device operates across a wide input voltage range of 1V to 40V with ±6% accuracy and is housed in an 8-SOIC surface mount package. The LM334SM carries a "Not For New Designs" status, making identification of equivalent and substitute parts essential for ongoing production and maintenance applications. Equivalent parts with active product status provide continuity for designs requiring current source functionality.

Substiute Parts

LM334SM

Texas InstrumentsIn Stock: 3830LM334SM Datasheet

Current PartRFQ

LM334SM/NOPB

Texas InstrumentsIn Stock: 40359LM334SM/NOPB Datasheet

DirectRFQ

LM334M

National SemiconductorIn Stock: 3285LM334M Datasheet

Parametric EquivalentRFQ

LM334M/NOPB

Texas InstrumentsIn Stock: 26600LM334M/NOPB Datasheet

Parametric EquivalentRFQ

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 of the LM334SM is determined by the following critical parameters: function (current source), package type (8-SOIC), input voltage range compatibility (1V ~ 40V minimum), output current adjustability, operating temperature range (0°C ~ 70°C), and surface mount mounting type. Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Manufacturer Equivalent (LM334SM/NOPB): Identical electrical specifications and package, differing only in packaging format (Tube vs. standard) and product status (Active vs. Not For New Designs). This part maintains ±6% accuracy and full parameter compatibility.

Parametric Equivalents (LM334M, LM334M/NOPB): Parts sharing the same base product number (LM334) with identical functional specifications, input voltage range, output adjustability, operating temperature, and package dimensions. These parts are manufactured by Texas Instruments with Active product status and RoHS3 compliance.

Manufacturer Recommended Alternatives (LM334S8#PBF, LM334S8#TRPBF): Analog Devices Inc. manufactured parts with identical package footprint and surface mount compatibility. These parts differ in specified output current (10mA fixed vs. adjustable) and input voltage floor (0.8V vs. 1V), requiring application-level verification of compatibility.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): LM334SM/NOPB is the primary substitute, offering identical electrical specifications and package compatibility with Active product status. This part is recommended for applications requiring immediate substitution with minimal design verification.

For RoHS3 Compliance Requirements: LM334M/NOPB provides full electrical equivalence with RoHS3 compliance certification, addressing regulatory requirements while maintaining ±6% accuracy and adjustable output current specifications.

For Alternative Sourcing: LM334M (National Semiconductor) offers parametric equivalence with Active status. LM334S8#PBF and LM334S8#TRPBF (Analog Devices Inc.) provide package-compatible alternatives with fixed 10mA output current and lower input voltage floor (0.8V), suitable only for applications where adjustable current output is not required and minimum input voltage of 0.8V is acceptable.

Frequently Asked Questions (FAQ)

Q: Can LM334SM/NOPB be used as a direct replacement for LM334SM? A: Yes. LM334SM/NOPB is electrically identical to LM334SM with matching ±6% accuracy, 1V ~ 40V input range, adjustable output current, and 8-SOIC package. The primary difference is packaging format (Tube) and Active product status.

Q: What is the key difference between LM334M/NOPB and LM334S8#PBF? A: LM334M/NOPB features adjustable output current with ±6% accuracy and 1V minimum input voltage. LM334S8#PBF has fixed 10mA output current, unspecified accuracy, and 0.8V minimum input voltage. Selection depends on whether adjustable current output is required for the application.

Q: Are all substitute parts pin-compatible with LM334SM? A: All listed substitutes share the 8-SOIC package footprint and are surface mount compatible. Pin compatibility must be verified against specific application schematics, as functional differences (adjustable vs. fixed output current) may affect circuit design.

Q: Which substitute part offers the best compliance profile? A: LM334M/NOPB and LM334S8#PBF both carry RoHS3 compliance certification. LM334SM/NOPB also provides RoHS3 compliance. The original LM334SM is RoHS non-compliant.

Q: Can LM334S8#TRPBF be used in high-volume production? A: Yes. LM334S8#TRPBF is supplied in Tape & Reel format, suitable for automated assembly processes. Verify that fixed 10mA output current and 0.8V minimum input voltage meet application requirements before implementation.

Q: What packaging options are available for substitute parts? A: LM334SM/NOPB and LM334M/NOPB are supplied in Tube packaging. LM334S8#PBF is supplied in Tube format. LM334S8#TRPBF is supplied in Tape & Reel (TR) format for automated pick-and-place assembly.