LM3046M/NOPB Equivalent & Substitute Parts

Part Overview

The LM3046M/NOPB is an RF transistor manufactured by Texas Instruments, designed as a 5 NPN surface mount device in 14-SOIC packaging. This component is classified as obsolete, making identification of suitable substitute parts essential for ongoing design support and production continuity. The part delivers 750mW maximum power dissipation with a collector-emitter breakdown voltage of 15V and supports collector currents up to 50mA, making it suitable for RF applications requiring low-noise performance at 3.25dB typical noise figure at 1kHz.

Substiute Parts

LM3046M/NOPB

Texas InstrumentsIn Stock: 1045LM3046M/NOPB Datasheet

Current PartRFQ

HFA3046BZ

Renesas Electronics CorporationIn Stock: 2308HFA3046BZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the obsolete LM3046M/NOPB is determined by strict alignment of the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor configuration: 5 NPN topology
• Package compatibility: 14-SOIC surface mount form factor with 0.154" (3.90mm) width
• Voltage rating: Collector-emitter breakdown voltage must meet or exceed application requirements
• Current handling: Maximum collector current capacity must support circuit demands
• DC current gain: hFE minimum specification must satisfy bias network design
• Thermal performance: Maximum power dissipation must accommodate operating conditions
• Temperature range: Operating temperature limits must cover application environment
• Compliance: RoHS3 compliance and REACH status alignment

The HFA3046BZ from Renesas Electronics Corporation qualifies as a manufacturer-recommended substitute based on identical package geometry, compatible transistor type, and shared compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

Compliance and Availability: The LM3046M/NOPB is classified as obsolete, eliminating it from new procurement. The HFA3046BZ maintains active product status with 2220 units in stock, ensuring supply chain continuity. Both parts achieve ROHS3 compliance and REACH unaffected status, satisfying environmental regulatory requirements.

Electrical Parameter Considerations: The HFA3046BZ presents lower maximum ratings in two critical areas: collector-emitter breakdown voltage (12V versus 15V) and maximum power dissipation (150mW versus 750mW). Circuit designs operating near the original part's voltage or thermal limits require verification that the substitute's reduced ratings remain acceptable. The substitute supports higher maximum collector current (65mA versus 50mA), which presents no compatibility constraint.

Packaging and Thermal Management: Both parts utilize identical 14-SOIC surface mount packaging with 0.154" width, ensuring PCB layout compatibility without redesign. The substitute's lower power rating necessitates evaluation of thermal dissipation requirements in the target application.

Moisture Handling: The substitute carries MSL-3 classification requiring 168-hour moisture control during storage, compared to the original part's MSL-1 unlimited rating. Storage and handling procedures must accommodate this requirement.

Frequently Asked Questions (FAQ)

Q: Can the HFA3046BZ directly replace the LM3046M/NOPB in all applications?

A: Direct replacement is possible only when the application operates within the HFA3046BZ's electrical ratings. The substitute's 12V collector-emitter breakdown voltage and 150mW power dissipation are lower than the original part. Verify that circuit maximum voltages and thermal loads remain within these limits.

Q: What is the significance of the different noise figure measurements?

A: The original part specifies 3.25dB noise figure at 1kHz, while the substitute specifies 3.5dB at 1GHz. These measurements occur at different frequencies, making direct comparison inappropriate. Noise performance evaluation requires application-specific frequency analysis.

Q: Are there pin-to-pin compatibility concerns?

A: Both parts use 14-SOIC packaging with identical 0.154" (3.90mm) width. Pin configuration compatibility requires verification against the specific device datasheets, as this information was not provided in the input parameters.

Q: How does the MSL-3 rating affect handling procedures?

A: The substitute's MSL-3 classification requires moisture control during storage and handling. Components must be stored in dry conditions and baked according to IPC standards before reflow soldering. The original part's MSL-1 rating imposed no such restrictions.

Q: What does "Active" product status mean for the substitute?

A: Active status indicates the HFA3046BZ is currently manufactured and supported by Renesas Electronics Corporation, ensuring long-term availability and technical support. The original part's obsolete status means Texas Instruments no longer manufactures or supports it.

Q: Should I test the substitute before full production implementation?

A: Evaluation of the HFA3046BZ within your specific circuit application is prudent engineering practice, particularly given the reduced voltage and power ratings. This assessment falls outside the scope of this substitution reference, which addresses only parameter compatibility.