2N3866A PBFREE Equivalent & Substitute Parts

Part Overview

The 2N3866A PBFREE is an RF transistor NPN rated for 30V collector-emitter breakdown voltage with 400mA maximum collector current and 5W maximum power dissipation. This through-hole TO-39 package device operates across a frequency range up to 800MHz and is designed for RF applications requiring moderate power handling. The part is classified as obsolete, necessitating identification of active equivalent and substitute components for new designs and ongoing production requirements.

Substiute Parts

2N3866A PBFREE

Central Semiconductor CorpIn Stock: 11622N3866A PBFREE Datasheet

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BFP410H6327XTSA1

Infineon TechnologiesIn Stock: 972BFP410H6327XTSA1 Datasheet

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BFP620H7764XTSA1

Infineon TechnologiesIn Stock: 14017BFP620H7764XTSA1 Datasheet

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BFP720H6327XTSA1

Infineon TechnologiesIn Stock: 3160BFP720H6327XTSA1 Datasheet

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MAPR-002729-170M00

MACOM Technology SolutionsIn Stock: 857MAPR-002729-170M00 Datasheet

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MRF428

MACOM Technology SolutionsIn Stock: 1498MRF428 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N3866A PBFREE is determined by the following critical parameters: transistor type (NPN), voltage rating capability, current handling capacity, power dissipation rating, frequency response, and mounting compatibility. The substitute parts listed fall into two distinct application categories based on these parameters:

Category 1: High-Frequency Surface Mount RF Transistors (BFP410H6327XTSA1, BFP620H7764XTSA1, BFP720H6327XTSA1) These Infineon Technologies parts operate at significantly higher frequencies (25GHz to 65GHz) with reduced power ratings (100mW to 185mW) and lower voltage ratings (2.8V to 5V). These devices are suitable for applications where the original 2N3866A was used in lower-power, higher-frequency RF circuits. All three parts feature surface mount SOT-343 packaging and active product status.

Category 2: High-Power Chassis Mount RF Transistors (MAPR-002729-170M00, MRF428) These MACOM Technology Solutions parts provide substantially higher power handling (150W to 170W) and current capacity (20A to 27A) with elevated voltage ratings (55V to 65V). These devices address applications requiring greater power dissipation than the original 2N3866A. Both parts feature chassis mount packaging and active product status.

Parameter Comparison

Engineering Selection Recommendations

For High-Frequency RF Applications (GHz Range): The BFP410H6327XTSA1, BFP620H7764XTSA1, and BFP720H6327XTSA1 are active products suitable for applications operating at frequencies significantly higher than the original 2N3866A. These parts are ROHS3 compliant and carry unlimited moisture sensitivity rating. Selection among these three depends on specific frequency and power requirements: BFP410H6327XTSA1 for 25GHz operation, BFP720H6327XTSA1 for 45GHz operation, and BFP620H7764XTSA1 for 65GHz operation. All three require redesign to accommodate surface mount SOT-343 packaging.

For High-Power RF Applications: The MAPR-002729-170M00 and MRF428 are active products designed for applications requiring power dissipation substantially exceeding the 2N3866A specification. MAPR-002729-170M00 provides 170W maximum power with 65V voltage rating and 27A current capacity. MRF428 provides 150W maximum power with 55V voltage rating and 20A current capacity. Both parts are ROHS3 compliant with unlimited moisture sensitivity rating and require chassis mount integration.

All substitute parts maintain NPN transistor type and ROHS3 compliance status consistent with the original 2N3866A PBFREE.

Frequently Asked Questions (FAQ)

Q: Can the BFP410H6327XTSA1, BFP620H7764XTSA1, or BFP720H6327XTSA1 directly replace the 2N3866A PBFREE in existing through-hole designs?

A: No. These Infineon parts feature surface mount SOT-343 packaging, whereas the 2N3866A PBFREE uses through-hole TO-39 packaging. Circuit board redesign is required to accommodate the different mounting technology and package footprint.

Q: What is the primary difference between the three Infineon RF transistor substitutes?

A: The three Infineon parts differ in frequency capability and power rating. BFP410H6327XTSA1 operates to 25GHz with 150mW power. BFP720H6327XTSA1 operates to 45GHz with 100mW power. BFP620H7764XTSA1 operates to 65GHz with 185mW power. Voltage ratings also vary: 5V, 4.7V, and 2.8V respectively.

Q: Are the MAPR-002729-170M00 and MRF428 suitable for the same applications as the 2N3866A PBFREE?

A: These MACOM parts serve different application requirements. They provide substantially higher power handling (150W to 170W) and current capacity (20A to 27A) compared to the 2N3866A (5W, 400mA). They are appropriate for high-power RF applications where the original part was insufficient. Mounting type is chassis mount rather than through-hole.

Q: What compliance certifications apply to all substitute parts?

A: All substitute parts listed are ROHS3 compliant and carry EAR99 ECCN classification. All parts maintain unlimited moisture sensitivity level (MSL 1) rating.

Q: How do the voltage ratings of substitute parts compare to the 2N3866A PBFREE?

A: The 2N3866A PBFREE is rated for 30V collector-emitter breakdown. The Infineon surface mount parts are rated lower: 5V, 4.7V, and 2.8V. The MACOM chassis mount parts are rated higher: 65V and 55V. Voltage selection depends on circuit requirements.

Q: What is the frequency advantage of the Infineon substitute parts?

A: The Infineon parts operate at significantly higher frequencies than the 2N3866A. The original part transitions at 800MHz. BFP410H6327XTSA1 transitions at 25GHz, BFP720H6327XTSA1 at 45GHz, and BFP620H7764XTSA1 at 65GHz. These higher-frequency devices are suitable for modern RF applications operating in the microwave and millimeter-wave bands.

Q: Is the 2N3866A PBFREE still available for purchase?

A: The 2N3866A PBFREE is classified as obsolete. However, 1134 pieces are reported in current inventory as new original stock. Availability may be limited and subject to depletion.