ZTX757STOB Equivalent & Substitute Parts

Part Overview

The ZTX757STOB is a Bipolar (BJT) Transistor manufactured by Diodes Incorporated, classified as a PNP-type transistor rated for 300 V collector-emitter breakdown voltage and 500 mA maximum collector current. This component is designed for through-hole mounting in E-Line (TO-92 compatible) packaging with a maximum power dissipation of 1 W and transition frequency of 30 MHz.

The ZTX757STOB is currently listed as obsolete. Identifying equivalent substitute parts is necessary to maintain design continuity and ensure component availability for production, repair, and maintenance applications where this transistor was originally specified.

Substiute Parts

ZTX757STOB

Diodes IncorporatedIn Stock: 709ZTX757STOB Datasheet

Current PartRFQ

ZTX757STZ

Diodes IncorporatedIn Stock: 10294ZTX757STZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX757STOB is determined by strict equivalence across the following critical electrical and mechanical parameters:

Electrical Parameters (Must Match):

• Transistor Type: PNP
• Maximum Collector Current (Ic): 500 mA
• Maximum Collector-Emitter Breakdown Voltage (Vce): 300 V
• Vce Saturation: 500mV @ 10mA, 100mA
• Maximum Collector Cutoff Current (ICBO): 100 nA
• Minimum DC Current Gain (hFE): 50 @ 100mA, 5V
• Maximum Power Dissipation: 1 W
• Transition Frequency: 30 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 (TO-92 compatible)

Compliance Parameters (Must Match):

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

Substitute parts must satisfy all electrical and mechanical parameters without deviation. Packaging format differences (such as tape and reel versus bulk) do not affect electrical or functional equivalence.

Parameter Comparison

Engineering Selection Recommendations

The ZTX757STZ is a direct electrical and mechanical equivalent to the ZTX757STOB. Both components are manufactured by Diodes Incorporated and share identical electrical specifications, operating parameters, and physical packaging.

Key Selection Factors:

Product Status: The ZTX757STOB is obsolete, while the ZTX757STZ is active. The ZTX757STZ is the recommended substitute for new designs, repairs, and ongoing production where the ZTX757STOB was originally specified.

Compliance: Both parts are ROHS3 compliant and carry identical REACH and ECCN classifications (REACH Unaffected, EAR99). Both maintain Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling requirements.

Packaging Difference: The primary distinction between these parts is packaging format. The ZTX757STOB is supplied in standard packaging, while the ZTX757STZ is supplied in Cut Tape (CT) format. This difference affects supply chain logistics and inventory management but does not alter electrical performance or functional compatibility.

Availability: The ZTX757STZ has significantly higher inventory availability (10,215 pieces in stock) compared to the ZTX757STOB (650 pieces in stock), making it the practical choice for component procurement.

Frequently Asked Questions (FAQ)

Q: Can the ZTX757STZ be used as a direct replacement for the ZTX757STOB?

A: Yes. The ZTX757STZ is electrically and mechanically equivalent to the ZTX757STOB. All electrical parameters, operating ranges, and physical dimensions are identical. Both components use the same E-Line-3 (TO-92 compatible) through-hole package.

Q: What is the difference between the ZTX757STOB and ZTX757STZ?

A: The primary difference is packaging format. The ZTX757STOB is supplied in standard packaging, while the ZTX757STZ is supplied in Cut Tape (CT) format. The electrical specifications and performance characteristics are identical.

Q: Why is the ZTX757STOB listed as obsolete?

A: The ZTX757STOB has been discontinued by the manufacturer. The ZTX757STZ remains in active production and serves as the current equivalent part.

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

A: No. Both the ZTX757STOB and ZTX757STZ carry identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and EAR99 classification. Both maintain Moisture Sensitivity Level 1 (Unlimited).

Q: Can I use the ZTX757STZ in existing circuit designs that specify the ZTX757STOB?

A: Yes. The ZTX757STZ is a direct substitute. No circuit modifications or design changes are required. Pin configuration, electrical characteristics, and operating parameters are identical.

Q: What is the operating temperature range for these transistors?

A: Both the ZTX757STOB and ZTX757STZ operate across a junction temperature range of -55°C to 200°C (TJ).

Q: What is the maximum power dissipation for the ZTX757STZ?

A: The maximum power dissipation is 1 W for both the ZTX757STOB and ZTX757STZ.

Q: Are there any moisture sensitivity concerns with these parts?

A: No. Both parts carry Moisture Sensitivity Level 1 (Unlimited), indicating no special moisture handling, storage, or reflow requirements.