ZTX705STOA Equivalent & Substitute Parts

Part Overview

The ZTX705STOA is a PNP Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This component operates at a maximum collector current of 1 A with a collector-emitter breakdown voltage of 120 V and delivers 1 W maximum power dissipation. The device features a transition frequency of 160 MHz and operates across a temperature range of -55°C to 200°C.

The ZTX705STOA is classified as an obsolete product. Locating equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications. Substitute parts must maintain electrical and mechanical compatibility while offering active product status and reliable supply chain availability.

Substiute Parts

ZTX705STOA

Diodes IncorporatedIn Stock: 868ZTX705STOA Datasheet

Current PartRFQ

ZTX705STZ

Diodes IncorporatedIn Stock: 3889ZTX705STZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ZTX705STOA are identified based on strict electrical and mechanical parameter matching. The substitution criteria are:

Electrical Parameters (Must Match):

• Transistor Type: PNP - Darlington
• Current - Collector (Ic) (Max): 1 A
• Voltage - Collector Emitter Breakdown (Max): 120 V
• Vce Saturation (Max) @ Ib, Ic: 2.5V @ 2mA, 2A
• Current - Collector Cutoff (Max): 10 µA
• DC Current Gain (hFE) (Min) @ Ic, Vce: 3000 @ 1A, 5V
• Power - Max: 1 W
• Frequency - Transition: 160 MHz
• Operating Temperature Range: -55°C to 200°C (TJ)

Mechanical Parameters (Must Match):

• Mounting Type: Through Hole
• Package / Case: E-Line-3, Formed Leads
• Supplier Device Package: E-Line (TO-92 compatible)

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Substitute parts may differ in packaging format (tape & box versus other configurations) and product status (active versus obsolete), provided all electrical, mechanical, and compliance specifications remain identical.

Parameter Comparison

Engineering Selection Recommendations

The ZTX705STZ is a direct electrical and mechanical equivalent to the ZTX705STOA. Both components are manufactured by Diodes Incorporated and share identical electrical specifications, including collector current rating, breakdown voltage, saturation characteristics, current gain, power dissipation, transition frequency, and operating temperature range. Both components are housed in the E-Line-3 package with formed leads, compatible with TO-92 footprints, and support through-hole mounting.

The primary distinction between these parts is product status and packaging format. The ZTX705STOA is classified as obsolete, while the ZTX705STZ maintains active product status with significantly higher inventory availability (3800 pieces versus 793 pieces). The ZTX705STZ is supplied in Tape & Box (TB) format, whereas the ZTX705STOA uses standard packaging.

Both components satisfy ROHS3 compliance requirements, maintain MSL Level 1 (unlimited moisture sensitivity), and are REACH unaffected. Selection of the ZTX705STZ is supported by its active product status, superior supply chain availability, and identical electrical and mechanical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Are the ZTX705STOA and ZTX705STZ electrically interchangeable?

A: Yes. Both components are PNP Darlington transistors with identical electrical specifications: 1 A maximum collector current, 120 V collector-emitter breakdown voltage, 2.5 V saturation voltage, 3000 minimum DC current gain, 1 W power dissipation, and 160 MHz transition frequency. Operating temperature ranges are identical at -55°C to 200°C.

Q: Can the ZTX705STZ be used as a direct replacement in existing PCB designs?

A: Yes. Both components use the E-Line-3 package with formed leads, compatible with TO-92 footprints. Through-hole mounting requirements are identical. No PCB layout modifications are required.

Q: What is the difference between the ZTX705STOA and ZTX705STZ packaging?

A: The ZTX705STOA uses standard packaging, while the ZTX705STZ is supplied in Tape & Box (TB) format. This difference affects handling and storage procedures but does not impact electrical performance or PCB compatibility.

Q: Why is the ZTX705STOA classified as obsolete?

A: The ZTX705STOA has reached end-of-life status. The ZTX705STZ remains in active production and is the recommended alternative for new designs and component replenishment.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the ZTX705STOA and ZTX705STZ are ROHS3 compliant, maintain MSL Level 1 (unlimited moisture sensitivity), and are REACH unaffected.

Q: What inventory considerations should be evaluated?

A: The ZTX705STZ offers significantly higher inventory availability at 3800 pieces compared to 793 pieces for the ZTX705STOA. For production planning and supply chain continuity, the ZTX705STZ is the preferred selection.

Q: Are there any thermal or frequency performance differences?

A: No. Both components operate across the identical temperature range (-55°C to 200°C) and share the same transition frequency specification of 160 MHz.