ZTX455QSTZ Equivalent & Substitute Parts

Part Overview

The ZTX455QSTZ is an NPN bipolar junction transistor (BJT) manufactured by Diodes Incorporated, designed for power and mid-performance applications. This through-hole component operates at collector currents up to 1 A with a collector-emitter breakdown voltage of 140 V and maximum power dissipation of 1 W. The device is packaged in an E-Line (TO-92 compatible) configuration with formed leads, suitable for through-hole mounting on printed circuit boards.

The ZTX455QSTZ maintains Active product status with full RoHS3 compliance and REACH unaffected classification. Identifying equivalent and substitute parts is necessary when the primary part number becomes unavailable, when alternative packaging formats are required for manufacturing processes, or when inventory optimization across different supplier packaging options is needed.

Substiute Parts

ZTX455QSTZ

Diodes IncorporatedIn Stock: 1000ZTX455QSTZ Datasheet

Current PartRFQ

ZTX455STZ

Diodes IncorporatedIn Stock: 2228ZTX455STZ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX455QSTZ is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must maintain identical specifications for transistor type (NPN), maximum collector current (1 A), collector-emitter breakdown voltage (140 V), saturation voltage characteristics (700mV @ 15mA, 150mA), collector cutoff current (100nA), DC current gain (100 @ 150mA, 10V), maximum power dissipation (1 W), transition frequency (100MHz), and operating temperature range (-55°C to 200°C).

The mechanical substitution criteria require identical mounting type (through hole), package classification (E-Line-3 with formed leads), and supplier device package designation (E-Line, TO-92 compatible). Substitution is permitted across different supplier packaging formats (Tape & Box versus Cut Tape) provided all electrical and mechanical parameters remain unchanged and the component maintains Active product status with equivalent compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The ZTX455STZ serves as a direct parametric equivalent to the ZTX455QSTZ. Both components are manufactured by Diodes Incorporated and maintain identical electrical and mechanical specifications across all critical performance parameters. The distinction between these part numbers is limited to supplier packaging format: the ZTX455QSTZ is supplied in Tape & Box configuration, while the ZTX455STZ is supplied in Cut Tape format.

Both parts maintain Active product status and carry equivalent compliance certifications (RoHS3 Compliant, REACH Unaffected). Selection between these two part numbers should be based on manufacturing process requirements and inventory management practices. Cut Tape packaging (ZTX455STZ) is suitable for automated pick-and-place assembly operations, while Tape & Box packaging (ZTX455QSTZ) provides bulk quantity organization for manual assembly or kit preparation.

Frequently Asked Questions (FAQ)

Q: Can the ZTX455STZ be used as a direct replacement for the ZTX455QSTZ in circuit applications?

A: Yes. The ZTX455STZ is a parametric equivalent with identical electrical characteristics, including collector current rating (1 A), breakdown voltage (140 V), saturation voltage (700mV @ 15mA, 150mA), current gain (100 @ 150mA, 10V), power dissipation (1 W), and transition frequency (100MHz). Both components use identical E-Line (TO-92 compatible) through-hole packaging with formed leads.

Q: What is the difference between these two part numbers?

A: The ZTX455QSTZ and ZTX455STZ differ only in supplier packaging format. The ZTX455QSTZ is supplied in Tape & Box (TB) configuration, while the ZTX455STZ is supplied in Cut Tape (CT) configuration. All electrical specifications, mechanical dimensions, and compliance certifications are identical.

Q: Are there any compatibility issues when switching between these part numbers?

A: No compatibility issues exist. Both parts share the same E-Line-3 package with formed leads, identical pin configuration, and through-hole mounting type. PCB layout, schematic designation, and circuit performance remain unchanged.

Q: Which packaging format should be selected for automated assembly?

A: Cut Tape (CT) packaging, represented by the ZTX455STZ, is optimized for automated pick-and-place assembly equipment. Tape & Box (TB) packaging, represented by the ZTX455QSTZ, is suitable for manual assembly or bulk kit preparation.

Q: Do both parts meet the same compliance requirements?

A: Yes. Both the ZTX455QSTZ and ZTX455STZ are RoHS3 Compliant and REACH Unaffected. Compliance certifications and regulatory classifications (ECCN: EAR99, HTSUS: 8541.29.0075) are identical.

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

A: Both parts operate across a junction temperature range of -55°C to 200°C (TJ), providing performance across extended industrial and high-temperature applications.

Q: Can these parts be used interchangeably in existing designs?

A: Yes. The ZTX455STZ and ZTX455QSTZ are fully interchangeable from an electrical and mechanical standpoint. Design changes are not required when substituting between these part numbers.