LM3046M Equivalent & Substitute Parts

Part Overview

The LM3046M 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 and is no longer in active production. The LM3046M was engineered for RF applications requiring low noise performance and moderate power dissipation in compact form factors.

Due to its obsolete status, sourcing new original inventory becomes increasingly difficult. Identifying qualified substitute parts with compatible electrical and mechanical specifications is essential for design continuity and production planning. Substitute parts must maintain functional equivalence within the allowed parameter ranges for this transistor category.

Substiute Parts

LM3046M

Texas InstrumentsIn Stock: 18151LM3046M Datasheet

Current PartRFQ

HFA3046BZ

Renesas Electronics CorporationIn Stock: 2308HFA3046BZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LM3046M is determined by strict alignment of the following critical parameters:

Package Compatibility: Both the main part and substitute must use 14-SOIC surface mount packaging with identical physical dimensions (0.154", 3.90mm Width) to ensure PCB footprint compatibility without layout redesign.

Transistor Configuration: The substitute must maintain 5 NPN transistor topology to preserve circuit function and biasing characteristics.

Electrical Operating Range: The substitute's maximum collector-emitter breakdown voltage must equal or exceed 15V. Maximum collector current must equal or exceed 50mA. Maximum power dissipation must equal or exceed 750mW to handle the same load conditions.

DC Current Gain: The substitute's minimum DC current gain (hFE) must be at least 40 at the specified test conditions to maintain amplification characteristics.

Noise Performance: The substitute's noise figure must be compatible with RF application requirements.

Operating Temperature: The substitute must support the full operating temperature range of -40°C to +85°C.

The HFA3046BZ from Renesas Electronics Corporation meets these substitution criteria within the allowed parameter envelope for this product category.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The LM3046M is classified as Obsolete, indicating end-of-life status and declining inventory availability. The HFA3046BZ is classified as Active, ensuring continued supply and manufacturing support from Renesas Electronics Corporation.

Compliance and Certification: The LM3046M is RoHS non-compliant and carries ECCN classification as Obsolete. The HFA3046BZ is ROHS3 compliant and carries ECCN classification EAR99, meeting current regulatory requirements for new designs and procurement in regulated markets.

Electrical Parameter Derating: The HFA3046BZ exhibits lower maximum voltage rating (12V vs. 15V) and lower maximum power dissipation (150mW vs. 750mW). Circuit designs must verify that operating conditions remain within the HFA3046BZ envelope. Applications requiring the full 15V breakdown voltage or 750mW power dissipation may require additional thermal management or alternative component selection.

Current Capability: The HFA3046BZ supports higher maximum collector current (65mA vs. 50mA), providing margin for current-driven applications.

Frequency Performance: The HFA3046BZ specifies 8GHz transition frequency, indicating suitability for higher frequency RF applications compared to the LM3046M specification.

Packaging and Mounting: Both devices use identical 14-SOIC surface mount packaging, eliminating PCB layout redesign requirements.

Frequently Asked Questions (FAQ)

Q: Can the HFA3046BZ directly replace the LM3046M without circuit modification?

A: Physical package compatibility is confirmed (both 14-SOIC). However, electrical parameter differences require circuit verification. The HFA3046BZ has lower maximum voltage (12V vs. 15V) and lower power rating (150mW vs. 750mW). Designs operating near these limits must be re-evaluated. DC current gain and noise figure remain compatible within specified test conditions.

Q: What is the primary reason for substitution?

A: The LM3046M is Obsolete and no longer manufactured by Texas Instruments. The HFA3046BZ is an Active product from Renesas Electronics Corporation with equivalent functional characteristics and improved regulatory compliance (ROHS3).

Q: Are there any thermal management differences?

A: The HFA3046BZ has significantly lower maximum power dissipation (150mW vs. 750mW). Designs dissipating power near the original 750mW specification must implement additional thermal management or reduce operating power levels when using the HFA3046BZ.

Q: Does the package footprint require PCB changes?

A: No. Both the LM3046M and HFA3046BZ use 14-SOIC packaging with identical physical dimensions (0.154", 3.90mm Width). PCB footprints are directly compatible without modification.

Q: What is the impact of the lower collector-emitter breakdown voltage?

A: The HFA3046BZ maximum breakdown voltage is 12V compared to 15V for the LM3046M. Circuits operating at voltages above 12V will exceed the substitute's rating. Verify that all operating conditions remain below 12V collector-emitter voltage.

Q: Are the DC current gain specifications equivalent?

A: Both devices specify minimum DC current gain (hFE) of 40. However, test conditions differ: LM3046M at 1mA/3V versus HFA3046BZ at 10mA/2V. Gain characteristics at specific operating points should be verified against datasheet curves for the intended application.

Q: What compliance advantages does the HFA3046BZ offer?

A: The HFA3046BZ is ROHS3 compliant and carries standard ECCN classification (EAR99), meeting current environmental and export regulations. The LM3046M is RoHS non-compliant and classified as Obsolete for export purposes.