ZTX614 Equivalent & Substitute Parts

Part Overview

The ZTX614 is an NPN Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a 100 V collector-emitter breakdown voltage rating and supports collector currents up to 800 mA with a maximum power dissipation of 1 W. The transistor is housed in an E-Line (TO-92 compatible) through-hole package and operates across a temperature range of -55°C to 200°C. The ZTX614 maintains Active product status with full RoHS3 compliance and unlimited moisture sensitivity rating. Equivalent and substitute parts are identified to provide design flexibility when the primary part is unavailable or when alternative sourcing is required.

Substiute Parts

ZTX614

Diodes IncorporatedIn Stock: 4481ZTX614 Datasheet

Current PartRFQ

MPSA29

onsemiIn Stock: 2930MPSA29 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the ZTX614 is determined by strict equivalence across the following critical parameters:

Transistor Configuration: Both the main part and substitute must be NPN-type Darlington transistors to maintain functional compatibility in existing circuit designs.

Electrical Ratings: The substitute part must support a maximum collector current of 800 mA and a collector-emitter breakdown voltage of 100 V. These ratings establish the upper operational limits for the device within the application circuit.

DC Current Gain: A minimum DC current gain (hFE) of 10000 ensures consistent amplification characteristics and switching performance across the specified operating conditions.

Power Dissipation: The substitute must accommodate the thermal requirements of the application, with power ratings meeting or exceeding the specified maximum.

Package Compatibility: The substitute must be housed in a through-hole package compatible with E-Line or TO-92 footprints to ensure mechanical fit and pin alignment on the printed circuit board.

Compliance and Status: Both parts must maintain Active product status and RoHS3 compliance to satisfy regulatory and supply chain requirements.

The MPSA29 manufactured by onsemi meets all substitution criteria and is identified as the manufacturer-recommended equivalent for the ZTX614.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: The ZTX614 remains the primary choice when available, as it offers the full specified operating temperature range (-55°C to 200°C) and maximum power dissipation of 1 W.

Substitute Selection: The MPSA29 is a direct functional equivalent and serves as the manufacturer-recommended substitute. Both devices maintain Active product status and full RoHS3 compliance. The MPSA29 operates within a reduced temperature range (-55°C to 150°C) and has a lower maximum power rating (625 mW). These differences are compatible with most general-purpose switching applications operating within standard industrial temperature ranges.

Compliance Assurance: Both parts carry ROHS3 compliance certification and REACH Unaffected status, ensuring regulatory compliance for applications subject to environmental and hazardous substance restrictions.

Supply Chain Considerations: Current inventory levels show 4408 units of ZTX614 and 2869 units of MPSA29 available. Either part may be selected based on delivery requirements and application-specific thermal constraints.

Frequently Asked Questions (FAQ)

Q: Can the MPSA29 directly replace the ZTX614 in all applications?

A: The MPSA29 is functionally equivalent for applications operating within its specified temperature range (-55°C to 150°C) and power dissipation limits (625 mW). Applications requiring operation above 150°C or dissipating more than 625 mW require the ZTX614.

Q: Are the package footprints identical between ZTX614 and MPSA29?

A: Both devices use through-hole TO-92 compatible packages. The ZTX614 is specified as E-Line-3, and the MPSA29 is specified as TO-92-3 (TO-226AA). These packages are mechanically and electrically compatible for standard through-hole PCB applications.

Q: What is the difference in saturation voltage between these parts?

A: The ZTX614 exhibits a maximum saturation voltage of 1.25 V at 8 mA base current and 800 mA collector current. The MPSA29 exhibits a maximum saturation voltage of 1.5 V at 100 µA base current and 100 mA collector current. Both values are within acceptable ranges for switching applications, though the ZTX614 provides lower saturation voltage at higher current levels.

Q: Do both parts have the same DC current gain specification?

A: Both parts specify a minimum DC current gain (hFE) of 10000. The ZTX614 is characterized at 500 mA collector current and 5 V collector-emitter voltage, while the MPSA29 is characterized at 100 mA collector current and 5 V collector-emitter voltage. The equivalent gain specification ensures consistent amplification performance.

Q: What is the maximum collector cutoff current for each part?

A: The ZTX614 specifies a maximum collector cutoff current (ICBO) of 100 nA, while the MPSA29 specifies 500 nA. Both values represent negligible leakage current for practical switching applications.

Q: Are there any frequency limitations for these Darlington transistors?

A: The MPSA29 is specified with a transition frequency of 125 MHz. The ZTX614 does not include a transition frequency specification in the provided parameters. For high-frequency switching applications, the MPSA29 provides documented frequency performance.

Q: Which part should be selected for high-temperature applications?

A: The ZTX614 supports operation up to 200°C junction temperature, making it the required choice for high-temperature applications. The MPSA29 is limited to 150°C junction temperature.