ZTX657STOB Equivalent & Substitute Parts

Part Overview

The ZTX657STOB is a Bipolar (BJT) NPN transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This component operates at 300 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 1 W power dissipation capability. The ZTX657STOB is classified as obsolete, necessitating identification of active equivalent parts to maintain design continuity and ensure long-term component availability for production and repair applications.

Substiute Parts

ZTX657STOB

Diodes IncorporatedIn Stock: 868ZTX657STOB Datasheet

Current PartRFQ

ZTX657STZ

Diodes IncorporatedIn Stock: 10453ZTX657STZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX657STOB is determined by electrical and mechanical parameter equivalence within the Bipolar (BJT) transistor category. The following parameters establish substitution validity:

Electrical Parameters (Critical):

• Transistor Type: NPN configuration
• Voltage - Collector Emitter Breakdown (Max): 300 V
• Current - Collector (Ic) (Max): 500 mA
• Power - Max: 1 W
• Frequency - Transition: 30 MHz
• DC Current Gain (hFE) (Min): 50 @ 100mA, 5V
• Vce Saturation (Max): 500mV @ 10mA, 100mA
• Current - Collector Cutoff (Max): 100nA (ICBO)
• Operating Temperature Range: -55°C ~ 200°C (TJ)

Mechanical Parameters (Critical):

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

Compliance Parameters:

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

Substitute parts must match all electrical and mechanical parameters while maintaining equivalent compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The ZTX657STZ serves as the direct equivalent substitute for the obsolete ZTX657STOB. Both components share identical electrical specifications, mechanical configuration, and compliance certifications. The primary distinction is product status: the ZTX657STOB is obsolete while the ZTX657STZ maintains active production status.

Selection Basis:

The ZTX657STZ is suitable for direct replacement in applications currently utilizing the ZTX657STOB. All electrical parameters, including collector-emitter breakdown voltage (300 V), maximum collector current (500 mA), power dissipation (1 W), and DC current gain characteristics, are identical. The through-hole E-Line (TO-92 compatible) package configuration ensures mechanical compatibility with existing PCB layouts and assembly processes.

The ZTX657STZ is ROHS3 compliant and REACH unaffected, maintaining regulatory compliance equivalent to the original part. The active production status of the ZTX657STZ ensures long-term availability and supply chain continuity for new designs and ongoing production requirements.

Frequently Asked Questions (FAQ)

Q: Can the ZTX657STZ directly replace the ZTX657STOB in existing designs?

A: Yes. The ZTX657STZ is electrically and mechanically identical to the ZTX657STOB. All electrical parameters, including voltage ratings, current ratings, gain characteristics, and frequency response, are equivalent. The through-hole E-Line package configuration is identical, enabling direct PCB substitution without layout modifications.

Q: What is the primary reason for substituting the ZTX657STOB?

A: The ZTX657STOB is classified as obsolete. The ZTX657STZ is the active equivalent part, ensuring continued component availability for production, repair, and new design applications.

Q: Are there packaging differences between the ZTX657STOB and ZTX657STZ?

A: The ZTX657STOB packaging specification is not provided in the technical data. The ZTX657STZ is supplied in Tape & Box (TB) packaging, which is standard for through-hole components. Both parts use the E-Line-3 package with formed leads, compatible with TO-92 footprints.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the ZTX657STOB and ZTX657STZ are ROHS3 compliant, REACH unaffected, and carry Moisture Sensitivity Level 1 (Unlimited). Compliance certifications are identical.

Q: What are the critical electrical parameters for substitution?

A: Substitution validity is determined by matching: NPN transistor type, 300 V collector-emitter breakdown voltage, 500 mA maximum collector current, 1 W power rating, 30 MHz transition frequency, 50 minimum DC current gain at specified conditions, and -55°C to 200°C operating temperature range.

Q: Is the ZTX657STZ available in inventory?

A: The ZTX657STZ is listed as active product status with 10,400 pieces in new original stock, ensuring immediate availability for component procurement.