ZTX718STOB Equivalent & Substitute Parts

Part Overview

The ZTX718STOB is a PNP bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 2.5 A, collector-emitter breakdown voltage of 20 V, and a transition frequency of 180 MHz, packaged in an E-Line (TO-92 compatible) through-hole configuration with a maximum power dissipation of 1 W.

The ZTX718STOB carries an obsolete product status. Identifying equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production requirements for applications utilizing this transistor.

Substiute Parts

ZTX718STOB

Diodes IncorporatedIn Stock: 873ZTX718STOB Datasheet

Current PartRFQ

ZTX718STZ

Diodes IncorporatedIn Stock: 4413ZTX718STZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX718STOB is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must satisfy the following criteria:

Electrical Parameters (Must Match):

• Transistor type: PNP
• Maximum collector current (Ic): 2.5 A
• Collector-emitter breakdown voltage: 20 V
• Vce saturation: 260 mV @ 200 mA, 2.5 A
• Collector cutoff current: 100 nA
• DC current gain (hFE): 150 minimum @ 2 A, 2 V
• Transition frequency: 180 MHz
• Maximum power dissipation: 1 W
• Operating temperature range: -55°C to 200°C

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: 1 (Unlimited)
• REACH Status: REACH Unaffected

The ZTX718STZ qualifies as a direct substitute based on identical electrical specifications, mechanical configuration, and regulatory compliance. The primary distinction is packaging format and product status.

Parameter Comparison

Engineering Selection Recommendations

The ZTX718STZ is a direct functional and mechanical equivalent to the ZTX718STOB. Both devices are manufactured by Diodes Incorporated and share identical electrical specifications, thermal operating range, and regulatory compliance certifications.

Product Status Consideration: The ZTX718STOB is classified as obsolete, while the ZTX718STZ maintains active product status. For new designs, ongoing production, or component replenishment, the ZTX718STZ is the appropriate selection to ensure long-term component availability and supply chain continuity.

Compliance and Certification: Both parts satisfy ROHS3 compliance requirements and carry REACH Unaffected status. Moisture sensitivity level is identical at MSL 1 (Unlimited), indicating no special moisture handling requirements during storage or assembly.

Packaging Consideration: The ZTX718STOB is supplied in tube packaging, while the ZTX718STZ is supplied in Tape & Box (TB) format. Both maintain the same E-Line (TO-92 compatible) through-hole configuration, ensuring mechanical and electrical compatibility in circuit board applications.

Frequently Asked Questions (FAQ)

Q: Can the ZTX718STZ be used as a direct replacement for the ZTX718STOB in existing circuit designs?

A: Yes. The ZTX718STZ is electrically and mechanically equivalent to the ZTX718STOB. All critical parameters including collector current, breakdown voltage, saturation characteristics, current gain, and transition frequency are identical. The through-hole E-Line package configuration is the same, enabling direct substitution in PCB layouts.

Q: What is the primary difference between the ZTX718STOB and ZTX718STZ?

A: The primary differences are product status and packaging format. The ZTX718STOB is obsolete and supplied in tube packaging, while the ZTX718STZ is an active product supplied in Tape & Box (TB) format. Electrical and mechanical specifications are identical.

Q: Are there any compliance or regulatory differences between these parts?

A: No. Both the ZTX718STOB and ZTX718STZ carry identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and MSL 1 (Unlimited). They are suitable for applications with equivalent regulatory requirements.

Q: Does the packaging format difference affect circuit performance?

A: No. Packaging format (tube versus Tape & Box) affects only component handling, storage, and assembly logistics. The electrical and mechanical characteristics of the transistor itself remain unchanged. The E-Line (TO-92 compatible) through-hole package configuration is identical for both parts.

Q: Why should I select the ZTX718STZ over the ZTX718STOB?

A: The ZTX718STZ is the recommended selection because it maintains active product status, ensuring ongoing availability and manufacturer support. The ZTX718STOB is obsolete and subject to discontinuation. For new designs and production continuity, the ZTX718STZ provides superior supply chain reliability.

Q: Are the thermal operating ranges identical?

A: Yes. Both the ZTX718STOB and ZTX718STZ operate across the same temperature range of -55°C to 200°C (junction temperature). Maximum power dissipation is 1 W for both devices.