LM334MX Equivalent & Substitute Parts

Part Overview

The LM334MX is a current source regulator IC manufactured by Texas Instruments, designed for adjustable current source applications in power management circuits. This component 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 LM334MX is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production requirements. Substitute parts maintain functional equivalence while offering improved availability and compliance status.

Substiute Parts

LM334MX

Texas InstrumentsIn Stock: 10052LM334MX Datasheet

Current PartRFQ

LM334MX/NOPB

Texas InstrumentsIn Stock: 24302LM334MX/NOPB Datasheet

Parametric EquivalentRFQ

LM334SMX

Texas InstrumentsIn Stock: 2180LM334SMX Datasheet

Parametric EquivalentRFQ

LM334SMX/NOPB

Texas InstrumentsIn Stock: 1842LM334SMX/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

Substitute parts for the LM334MX are classified based on strict parametric equivalence. The primary substitution criteria are:

Core Electrical Parameters:

• Function: Current Source
• Accuracy: ±6% (for Texas Instruments variants)
• Input Voltage Range: 1V ~ 40V
• Output Current: Adjustable
• Operating Temperature: 0°C ~ 70°C

Mechanical Compatibility:

• Package / Case: 8-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• Pin configuration and footprint compatibility

Compliance & Status:

• RoHS3 Compliance (preferred for new designs)
• Active or Last Time Buy product status
• MSL Level 1 (Unlimited)

Substitute parts are grouped into two categories: Texas Instruments parametric equivalents (LM334MX/NOPB, LM334SMX, LM334SMX/NOPB) and manufacturer-recommended alternatives from Analog Devices Inc. (LM334S8#PBF, LM334S8#TRPBF). All substitutes maintain identical package geometry and functional operation within specified parameters.

Parameter Comparison

Engineering Selection Recommendations

For RoHS3 Compliant Designs: LM334MX/NOPB is the primary recommended substitute, offering Active product status, ROHS3 compliance, and the highest inventory availability (24280 Pcs). This part maintains identical electrical specifications to the obsolete LM334MX while providing superior compliance certification and supply chain stability.

For Last Time Buy Scenarios: LM334SMX and LM334SMX/NOPB are available as Last Time Buy or Active alternatives. LM334SMX/NOPB is preferred due to Active status and Tape & Reel packaging, supporting automated assembly processes.

For Analog Devices Sourcing: LM334S8#PBF and LM334S8#TRPBF are manufacturer-recommended alternatives from Analog Devices Inc. These parts maintain 8-SOIC package compatibility and ROHS3 compliance. Note that output current is specified as 10mA fixed rather than adjustable, and accuracy specification is not provided. These parts are suitable only for applications where fixed 10mA output current meets design requirements.

Packaging Considerations:

• Cut Tape (CT) & Digi-Reel® packaging: LM334MX/NOPB
• Tape & Reel (TR): LM334SMX/NOPB, LM334S8#TRPBF
• Tube: LM334S8#PBF

Frequently Asked Questions (FAQ)

Q: Can LM334MX be directly replaced with LM334MX/NOPB? A: Yes. LM334MX/NOPB is a direct parametric equivalent with identical electrical specifications (±6% accuracy, 1V–40V input, adjustable output current, 0°C–70°C operating range) and identical 8-SOIC package geometry. The primary difference is RoHS3 compliance status and Active product availability.

Q: What is the difference between LM334SMX and LM334SMX/NOPB? A: Both parts are parametric equivalents with identical electrical and mechanical specifications. The "/NOPB" suffix indicates lead-free, RoHS3 compliant packaging. LM334SMX/NOPB is in Active status with Tape & Reel packaging, while LM334SMX is Last Time Buy status.

Q: Are Analog Devices LM334S8 parts fully compatible with Texas Instruments LM334MX? A: Mechanical and thermal compatibility is maintained (8-SOIC package, 0°C–70°C operating range, ROHS3 compliance). However, electrical specifications differ: LM334S8 parts specify fixed 10mA output current rather than adjustable output, and accuracy is not specified. These parts are suitable only for applications requiring fixed 10mA current source operation.

Q: What does the packaging designation mean (CT, TR, Tube)? A: Cut Tape (CT) & Digi-Reel® is suitable for manual or semi-automated assembly. Tape & Reel (TR) is optimized for high-speed automated pick-and-place assembly. Tube packaging is used for manual assembly or lower-volume applications. All three packaging formats contain identical die and electrical performance.

Q: Why is RoHS3 compliance important for substitute selection? A: RoHS3 compliance ensures the part meets current environmental and hazardous substance restrictions required in many markets and by OEM procurement standards. Obsolete parts like LM334MX may not meet these requirements, making RoHS3 compliant substitutes necessary for new production and long-term supply chain viability.

Q: Can I use LM334S8#PBF in place of LM334MX for adjustable current source applications? A: No. LM334S8#PBF specifies fixed 10mA output current, while LM334MX provides adjustable output current. Use LM334S8#PBF only in applications where fixed 10mA operation is acceptable. For adjustable current source requirements, use Texas Instruments LM334MX/NOPB, LM334SMX, or LM334SMX/NOPB.