ZTX558W Equivalent & Substitute Parts

Part Overview

The ZTX558W is a Bipolar (BJT) Transistor with PNP polarity manufactured by Diodes Incorporated. This component is classified as obsolete, which necessitates identification of active equivalent parts for ongoing design and procurement requirements. The ZTX558W operates at 400 V collector-emitter breakdown voltage with a maximum collector current of 200 mA and is housed in an E-Line (TO-92 compatible) through-hole package. Due to its obsolete status, sourcing active alternatives with identical electrical and mechanical specifications is essential for production continuity and new design implementations.

Substiute Parts

ZTX558W

Diodes IncorporatedIn Stock: 870ZTX558W Datasheet

Current PartRFQ

ZTX558

Diodes IncorporatedIn Stock: 15634ZTX558 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX558W is determined by strict equivalence across all critical electrical and mechanical parameters. The substitute part must satisfy the following criteria:

Electrical Parameters (Mandatory Match):

• Transistor polarity: PNP
• Maximum collector current: 200 mA
• Collector-emitter breakdown voltage: 400 V
• Vce saturation: 500mV @ 6mA, 50mA
• Collector cutoff current: 100 nA
• DC current gain (hFE): 100 minimum @ 50mA, 10V
• Maximum power dissipation: 1 W
• Transition frequency: 50 MHz
• Operating temperature range: -55°C to 200°C

Mechanical Parameters (Mandatory Match):

• Mounting type: Through Hole
• Package designation: E-Line-3
• Supplier device package: E-Line (TO-92 compatible)

The ZTX558 (without the "W" suffix) meets all specified electrical and mechanical parameters and is classified as an active product, making it a direct parametric equivalent suitable for replacement in applications currently using the ZTX558W.

Parameter Comparison

Engineering Selection Recommendations

The ZTX558 is the direct substitute for the ZTX558W based on complete parametric equivalence. The primary distinction between these parts is product status: the ZTX558W is obsolete while the ZTX558 maintains active status with Diodes Incorporated.

Selection Basis:

Both parts are ROHS3 compliant and manufactured by the same supplier, ensuring regulatory alignment. The ZTX558 is available in bulk packaging with significantly higher inventory levels (15,600 pieces) compared to the ZTX558W (839 pieces), supporting production scalability and supply chain reliability.

All electrical specifications, mechanical dimensions, and thermal operating ranges are identical between the two parts. The E-Line (TO-92 compatible) through-hole package ensures direct physical compatibility in existing PCB layouts and assembly processes.

For new designs and production continuity, the ZTX558 is the appropriate selection due to its active product status and equivalent performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can the ZTX558 be used as a direct replacement for the ZTX558W in existing designs?

A: Yes. The ZTX558 is a direct parametric equivalent with identical electrical and mechanical specifications. All performance characteristics, including collector current, breakdown voltage, gain, and package dimensions, are equivalent. The parts are interchangeable at the circuit level.

Q: What is the difference between ZTX558W and ZTX558?

A: The primary difference is product status. The ZTX558W is classified as obsolete, while the ZTX558 is an active product. All electrical parameters, thermal characteristics, and physical packaging are identical. The "W" suffix designation on the ZTX558W does not indicate a functional or performance difference.

Q: Are both parts available in the same package?

A: Yes. Both the ZTX558W and ZTX558 are housed in the E-Line-3 package, which is TO-92 compatible. This ensures identical physical dimensions and through-hole mounting compatibility.

Q: What compliance certifications apply to the ZTX558 substitute?

A: The ZTX558 is ROHS3 compliant and REACH unaffected. These certifications match the compliance profile of the ZTX558W, ensuring regulatory alignment for applications subject to environmental and hazardous substance restrictions.

Q: Is there a difference in operating temperature range between the two parts?

A: No. Both the ZTX558W and ZTX558 operate across the identical temperature range of -55°C to 200°C (junction temperature). Thermal performance and derating characteristics are equivalent.

Q: What is the recommended approach for transitioning from ZTX558W to ZTX558?

A: Direct substitution is appropriate. No circuit modifications, PCB layout changes, or design alterations are required. The ZTX558 can be used in all applications currently specified for the ZTX558W without functional or performance impact.