2N6109 Equivalent & Substitute Parts

Part Overview

The 2N6109 is an obsolete PNP bipolar junction transistor manufactured by onsemi, rated for 50 V collector-emitter breakdown voltage and 7 A maximum collector current in a TO-220 through-hole package. The device is designed for general-purpose switching and amplification applications requiring moderate power dissipation up to 40 W. Due to its obsolete product status and RoHS non-compliant classification, equivalent substitute parts are necessary for new designs and ongoing production requirements. Suitable alternatives must maintain electrical compatibility across critical parameters including voltage rating, current capacity, and thermal characteristics while meeting modern compliance standards where applicable.

Substiute Parts

2N6109

onsemiIn Stock: 13092N6109 Datasheet

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2N6109 PBFREE

Central Semiconductor CorpIn Stock: 19242N6109 PBFREE Datasheet

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TIP42A

NTE Electronics, IncIn Stock: 14388TIP42A Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 2N6109 is determined by strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria:

• Transistor type must be PNP
• Collector-emitter breakdown voltage must be greater than or equal to 50 V
• Maximum collector current must be greater than or equal to 7 A
• Maximum power dissipation must be greater than or equal to 40 W
• Package type must be TO-220 through-hole configuration
• Operating temperature range must encompass -65°C to 150°C

Secondary Compatibility Parameters:

• Vce saturation characteristics at specified bias conditions
• DC current gain (hFE) minimum values
• Collector cutoff current specifications
• Transition frequency ratings

Parts meeting all primary criteria are classified as direct substitutes. Parts meeting primary criteria with variations in secondary parameters are classified as functional equivalents with noted parameter differences.

Parameter Comparison

Engineering Selection Recommendations

2N6109 PBFREE (Central Semiconductor Corp)

The 2N6109 PBFREE is a direct electrical equivalent to the original 2N6109, maintaining identical maximum ratings for collector current (7 A), collector-emitter breakdown voltage (50 V), and power dissipation (40 W). This part is ROHS3 compliant, addressing regulatory requirements for new production. The primary distinction is reduced transition frequency (4 MHz versus 10 MHz), which is acceptable for low-frequency switching applications but may limit performance in higher-frequency circuits. This substitute is recommended for applications where RoHS compliance is mandatory and switching frequency does not exceed 4 MHz.

TIP42A (NTE Electronics, Inc)

The TIP42A is an active-status PNP transistor in TO-220 package with higher collector-emitter breakdown voltage (60 V) but reduced maximum collector current (6 A) and significantly lower power dissipation (2 W). The TIP42A does not meet the primary substitution criterion of 40 W power rating and is therefore not suitable for applications requiring the full 7 A collector current at rated power levels. This part is classified as a functional equivalent only for low-power applications operating below 2 W dissipation and 6 A collector current. The TIP42A is not recommended as a general substitute for the 2N6109 in standard applications.

Frequently Asked Questions (FAQ)

Q: Can the 2N6109 PBFREE be used as a direct replacement in all 2N6109 applications?

A: The 2N6109 PBFREE maintains identical electrical ratings for voltage, current, and power. However, the reduced transition frequency (4 MHz versus 10 MHz) restricts its use to applications operating at 4 MHz or below. Verify circuit switching frequency before substitution.

Q: Is the TIP42A a suitable replacement for the 2N6109?

A: The TIP42A does not meet the 40 W power dissipation requirement of the 2N6109 and is rated for only 2 W maximum. Additionally, maximum collector current is limited to 6 A. The TIP42A is not recommended as a general substitute and is suitable only for applications requiring less than 2 W power dissipation and 6 A collector current.

Q: What is the significance of the TO-220-3 package specification?

A: The TO-220-3 package is a three-lead through-hole configuration with standardized pin spacing and thermal characteristics. All listed substitutes use this identical package, ensuring mechanical and thermal compatibility without PCB redesign.

Q: Why is RoHS compliance important for the 2N6109 PBFREE?

A: ROHS3 compliance indicates the part meets current environmental and regulatory standards for lead-free manufacturing. The original 2N6109 is RoHS non-compliant. For new designs and production in regulated markets, the PBFREE variant is required.

Q: Are there any thermal considerations when substituting these parts?

A: All three parts use the TO-220-3 package with equivalent thermal interface characteristics. Thermal management design based on the 2N6109 specifications remains valid for the 2N6109 PBFREE. The TIP42A, with 2 W maximum dissipation, generates significantly less heat and may not require equivalent heatsinking.

Q: What is the operating temperature range compatibility?

A: The 2N6109 and 2N6109 PBFREE both operate from -65°C to 150°C. The TIP42A specification provides only maximum junction temperature (150°C) without minimum temperature data. Verify TIP42A minimum operating temperature for applications requiring low-temperature operation below 0°C.