ZTX658STOA Equivalent & Substitute Parts

Part Overview

The ZTX658STOA is a Bipolar (BJT) NPN transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This component operates at 400 V collector-emitter breakdown voltage with a maximum collector current of 500 mA and 1 W power dissipation capability. The ZTX658STOA is classified as an obsolete product, necessitating identification of active equivalent parts to maintain design continuity and ensure ongoing component availability for production and repair applications.

Substiute Parts

ZTX658STOA

Diodes IncorporatedIn Stock: 1035ZTX658STOA Datasheet

Current PartRFQ

ZTX658STZ

Diodes IncorporatedIn Stock: 4383ZTX658STZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX658STOA is determined by electrical and mechanical parameter equivalence within the Bipolar (BJT) transistor category. The substitute part must satisfy the following criteria:

Electrical Parameters (Critical for Functional Equivalence):

• Transistor Type: NPN
• Voltage - Collector Emitter Breakdown (Max): 400 V
• Current - Collector (Ic) (Max): 500 mA
• Power - Max: 1 W
• Frequency - Transition: 50 MHz
• DC Current Gain (hFE) (Min) @ Ic, Vce: 50 @ 100mA, 5V
• Vce Saturation (Max) @ Ib, Ic: 500mV @ 10mA, 100mA
• Current - Collector Cutoff (Max): 100nA (ICBO)
• Operating Temperature Range: -55°C ~ 200°C (TJ)

Mechanical Parameters (Critical for Physical Compatibility):

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

The ZTX658STOA shares the same base product number (ZTX658) with its substitute, confirming design lineage and electrical compatibility. Packaging differences between the main part and substitute are limited to supplier delivery format (loose versus tape & box), which does not affect electrical or mechanical performance in the application circuit.

Parameter Comparison

Engineering Selection Recommendations

The ZTX658STZ is a direct functional and mechanical equivalent to the ZTX658STOA. Both components are manufactured by Diodes Incorporated and share identical electrical specifications across all critical parameters: collector-emitter breakdown voltage, maximum collector current, power dissipation, transition frequency, DC current gain, saturation voltage, and operating temperature range. Both components are housed in the E-Line-3 package with formed leads, compatible with TO-92 footprints.

The primary distinction between these parts is product status: the ZTX658STOA is classified as obsolete, while the ZTX658STZ is active. The ZTX658STZ is available in higher inventory quantities (4300 Pcs) compared to the ZTX658STOA (987 Pcs), supporting long-term supply chain continuity.

Both parts maintain identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and Moisture Sensitivity Level 1 (Unlimited). The difference in supplier packaging format (Tape & Box for ZTX658STZ versus loose for ZTX658STOA) does not affect electrical performance or mechanical compatibility in circuit applications.

For new designs and ongoing production, the ZTX658STZ is the appropriate selection due to its active product status and superior availability. For existing applications currently using the ZTX658STOA, direct substitution with the ZTX658STZ is electrically and mechanically valid without circuit modification.

Frequently Asked Questions (FAQ)

Q: Can the ZTX658STZ be used as a direct replacement for the ZTX658STOA in existing circuit designs?

A: Yes. The ZTX658STZ is electrically and mechanically equivalent to the ZTX658STOA. All electrical parameters, including voltage ratings, current ratings, gain characteristics, and operating temperature range, are identical. Both components use the same E-Line-3 package with formed leads, compatible with TO-92 footprints. No circuit modifications are required.

Q: What is the difference between the ZTX658STOA and ZTX658STZ?

A: The components are electrically and mechanically identical. The primary differences are: (1) Product Status: ZTX658STOA is obsolete; ZTX658STZ is active. (2) Supplier Packaging: ZTX658STOA is supplied loose; ZTX658STZ is supplied in Tape & Box format. (3) Inventory Availability: ZTX658STZ has higher stock levels (4300 Pcs versus 987 Pcs).

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

A: No. Both the ZTX658STOA and ZTX658STZ carry identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and Moisture Sensitivity Level 1 (Unlimited). Both are assigned the same ECCN (EAR99) and HTSUS code (8541.29.0075).

Q: Why is the ZTX658STOA listed as obsolete?

A: The ZTX658STOA is classified as obsolete by the manufacturer. The ZTX658STZ, sharing identical electrical and mechanical specifications, is the active equivalent part. For new designs and ongoing production, the ZTX658STZ is the recommended selection.

Q: Does the Tape & Box packaging of the ZTX658STZ affect its electrical performance?

A: No. Supplier packaging format (Tape & Box versus loose) is a logistics and handling consideration only. It does not affect the electrical characteristics, mechanical compatibility, or performance of the component in circuit applications.

Q: What are the critical electrical parameters that define substitution compatibility?

A: Substitution compatibility is determined by: Transistor Type (NPN), Voltage - Collector Emitter Breakdown (400 V), Current - Collector (500 mA), Power - Max (1 W), Frequency - Transition (50 MHz), DC Current Gain (50 @ 100mA, 5V), Vce Saturation (500mV @ 10mA, 100mA), Current - Collector Cutoff (100nA), and Operating Temperature Range (-55°C ~ 200°C). The ZTX658STZ matches all these parameters.

Q: Can the ZTX658STZ be used in high-temperature applications?

A: Yes. The ZTX658STZ operates across the temperature range of -55°C to 200°C (TJ), identical to the ZTX658STOA. This range supports both cryogenic and elevated-temperature applications within the specified limits.

Q: Is the ZTX658STZ suitable for RoHS-compliant applications?

A: Yes. The ZTX658STZ is ROHS3 Compliant and REACH Unaffected, meeting environmental and regulatory requirements for RoHS-compliant applications.