LM3046MX Equivalent & Substitute Parts

Part Overview

The LM3046MX is an RF transistor manufactured by Texas Instruments, designed as a 5 NPN surface mount device for RF applications. This part operates at a maximum collector-emitter breakdown voltage of 15V with a maximum power dissipation of 750mW and a maximum collector current of 50mA. The device is packaged in a 14-SOIC surface mount package.

The LM3046MX has reached obsolete product status, making it necessary to identify equivalent substitute components for ongoing design requirements and production needs. Substitute parts must maintain functional compatibility within the specified electrical and mechanical parameters.

Substiute Parts

LM3046MX

Texas InstrumentsIn Stock: 2878LM3046MX Datasheet

Current PartRFQ

HFA3127BZ

Renesas Electronics CorporationIn Stock: 2084HFA3127BZ Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the LM3046MX are identified based on the following critical parameters that determine functional compatibility:

Transistor Configuration: Both the main part and substitute must be 5 NPN transistor arrays to maintain circuit topology compatibility.

Voltage Rating: The substitute must support the collector-emitter breakdown voltage requirements of the application. The LM3046MX operates at a maximum of 15V.

Power Dissipation: The substitute must be capable of handling the thermal load specified in the design. The LM3046MX is rated for 750mW maximum power dissipation.

Collector Current: The substitute must support the maximum collector current of 50mA required by the circuit.

DC Current Gain: The substitute must meet or exceed the minimum DC current gain (hFE) of 40 at the specified operating conditions to ensure proper circuit biasing and signal amplification.

Mounting Type and Package: Surface mount compatibility and SOIC package format are required for PCB assembly compatibility.

Operating Temperature Range: The substitute must support the operating temperature range of -40°C to 85°C to ensure reliable operation across the specified environmental conditions.

Parameter Comparison

Engineering Selection Recommendations

Product Status Consideration: The LM3046MX is obsolete, while the HFA3127BZ is in active production status. This makes the HFA3127BZ the appropriate choice for new designs and ongoing production requiring long-term component availability.

Compliance and Certification: The HFA3127BZ is ROHS3 compliant, meeting current environmental and regulatory requirements. The LM3046MX is RoHS non-compliant, which may present regulatory and supply chain challenges for new applications.

Electrical Parameter Constraints: The HFA3127BZ has lower maximum ratings for collector-emitter breakdown voltage (12V versus 15V) and power dissipation (150mW versus 750mW). Substitution is valid only for applications where the circuit operates within these lower limits.

Package Compatibility: The HFA3127BZ uses a 16-SOIC package compared to the 14-SOIC package of the LM3046MX. While the body width is identical, the different pin count requires PCB layout modification and verification of pinout compatibility with the specific application circuit.

Current and Gain Characteristics: The HFA3127BZ supports higher maximum collector current (65mA) and meets the minimum DC current gain requirement (40), making it suitable for applications requiring up to 50mA collector current.

Frequently Asked Questions (FAQ)

Q: Can the HFA3127BZ directly replace the LM3046MX without PCB modifications?

A: No. The HFA3127BZ uses a 16-SOIC package while the LM3046MX uses a 14-SOIC package. Although the body width is identical, the different pin count requires PCB layout modification and verification of pinout compatibility before substitution.

Q: What are the voltage limitations when using the HFA3127BZ as a substitute?

A: The HFA3127BZ has a maximum collector-emitter breakdown voltage of 12V, compared to 15V for the LM3046MX. Applications must operate at or below 12V to ensure reliable operation with the substitute part.

Q: Are there power dissipation constraints with the HFA3127BZ?

A: Yes. The HFA3127BZ is rated for a maximum power dissipation of 150mW, significantly lower than the LM3046MX rating of 750mW. Circuit designs must ensure that power dissipation does not exceed 150mW when using this substitute.

Q: Does the HFA3127BZ meet current regulatory requirements?

A: Yes. The HFA3127BZ is ROHS3 compliant, meeting current environmental and regulatory standards. The LM3046MX is RoHS non-compliant, making the HFA3127BZ preferable for applications subject to RoHS requirements.

Q: What is the difference in noise figure between these parts?

A: The LM3046MX has a noise figure of 3.25dB measured at 1kHz, while the HFA3127BZ has a noise figure of 3.5dB measured at 1GHz. The measurements are taken at different frequencies, making direct comparison difficult. Application-specific noise requirements must be evaluated.

Q: Is the HFA3127BZ suitable for all LM3046MX applications?

A: No. Substitution is valid only for applications where the circuit operates within the lower electrical ratings of the HFA3127BZ (12V maximum voltage, 150mW maximum power, 50mA maximum collector current). PCB layout modification is required due to package differences.

Q: What is the availability status of these parts?

A: The LM3046MX is obsolete with limited remaining inventory. The HFA3127BZ is in active production, ensuring long-term availability for new designs and ongoing production requirements.