2N6724 Equivalent & Substitute Parts

Part Overview

The 2N6724 is an NPN Darlington bipolar junction transistor manufactured by onsemi, designed for through-hole applications in the TO-237AA package. This device is rated for 40 V collector-emitter breakdown voltage and 1 A maximum collector current, with a maximum power dissipation of 1 W. The 2N6724 is classified as obsolete, making identification of equivalent and substitute parts necessary for ongoing design support and component procurement in legacy systems or redesign initiatives.

Substiute Parts

2N6724

onsemiIn Stock: 16282N6724 Datasheet

Current PartRFQ

ZTX601

Diodes IncorporatedIn Stock: 2008ZTX601 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 2N6724 is determined by the following critical parameters:

Mandatory Matching Criteria:

• Transistor Type: NPN - Darlington configuration
• Current - Collector (Ic) (Max): 1 A minimum
• Mounting Type: Through Hole
• Power - Max: 1 W minimum

Allowable Parameter Variations:

• Voltage - Collector Emitter Breakdown (Max): Substitute must equal or exceed 40 V
• Vce Saturation (Max): Substitute may differ within acceptable operating margins
• DC Current Gain (hFE): Substitute may differ; higher values are acceptable
• Package / Case: Substitute may use alternative through-hole packages compatible with circuit board layout
• Product Status: Active substitutes are preferred for long-term availability

The ZTX601 qualifies as a substitute based on these criteria. It maintains the NPN Darlington configuration, supports 1 A collector current, and is rated for 1 W power dissipation. The ZTX601 exceeds the voltage rating (160 V vs. 40 V), operates at higher frequency (250 MHz), and is currently in active production status with RoHS3 compliance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Substitution in Existing Designs:

The ZTX601 (Diodes Incorporated) is suitable as a substitute for the 2N6724 in applications where the following conditions are met:

1. Electrical Compatibility: The ZTX601 maintains identical collector current (1 A) and power dissipation (1 W) ratings. The higher voltage rating (160 V vs. 40 V) presents no limitation for circuits designed around 40 V operation. The lower saturation voltage (1.2 V vs. 1.5 V) may improve efficiency in switching applications.

2. Physical Compatibility: The ZTX601 uses an E-Line (TO-92 compatible) package rather than TO-237AA. Circuit board layout modifications may be required to accommodate the different pin configuration and physical dimensions.

3. Compliance Status: The ZTX601 is RoHS3 compliant and in active production, providing long-term availability and regulatory compliance advantages over the obsolete, non-compliant 2N6724.

4. Performance Enhancement: The ZTX601 offers 250 MHz transition frequency, enabling use in higher-frequency applications beyond the original 2N6724 design scope.

For New Designs:

The ZTX601 is the recommended choice for new development, offering superior compliance status, active production support, and enhanced frequency performance.

Frequently Asked Questions (FAQ)

Q: Can the ZTX601 directly replace the 2N6724 without circuit modifications?

A: Electrical substitution is valid. The ZTX601 meets or exceeds all critical electrical parameters (collector current, power rating, voltage capability). However, physical package differences (E-Line vs. TO-237AA) require circuit board layout evaluation and potential PCB modifications for pin placement and thermal management.

Q: Why is the ZTX601 voltage rating (160 V) higher than the 2N6724 (40 V)?

A: Higher voltage ratings do not prevent substitution in lower-voltage applications. The ZTX601 operates safely at 40 V and below. The higher rating provides design margin and enables the device to function in a broader range of circuit applications.

Q: Does the lower saturation voltage of the ZTX601 affect circuit operation?

A: The ZTX601 saturation voltage (1.2 V @ 10mA, 1A) is lower than the 2N6724 (1.5 V @ 2mA, 1A). In switching applications, lower saturation voltage typically reduces power dissipation and improves efficiency. Circuit performance should be evaluated for the specific application.

Q: What are the package compatibility considerations?

A: The 2N6724 uses TO-237AA packaging, while the ZTX601 uses E-Line (TO-92 compatible) packaging. Both are through-hole devices, but pin spacing and physical dimensions differ. PCB footprint redesign is necessary for mechanical fit and proper thermal coupling to the circuit board.

Q: Is the ZTX601 suitable for RoHS-compliant applications?

A: Yes. The ZTX601 is RoHS3 compliant, meeting current environmental and regulatory requirements. The 2N6724 is RoHS non-compliant, making the ZTX601 the appropriate choice for new designs subject to RoHS regulations.

Q: Can the ZTX601 be used in high-frequency applications?

A: The ZTX601 is rated for 250 MHz transition frequency, enabling operation in higher-frequency circuits. The 2N6724 transition frequency is not specified. Applications requiring frequencies above the 2N6724 specification should evaluate the ZTX601 for suitability.

Q: What is the availability status of these parts?

A: The 2N6724 is obsolete and subject to limited availability. The ZTX601 is in active production with 1910 units in current stock, providing reliable long-term procurement support.