ZTX658STOB Equivalent & Substitute Parts

Part Overview

The ZTX658STOB 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 ZTX658STOB 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

ZTX658STOB

Diodes IncorporatedIn Stock: 1032ZTX658STOB Datasheet

Current PartRFQ

ZTX658STZ

Diodes IncorporatedIn Stock: 4383ZTX658STZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX658STOB is determined by electrical and mechanical parameter equivalence within the Bipolar (BJT) NPN 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)

Compliance Parameters:

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

Parameter Comparison

Engineering Selection Recommendations

The ZTX658STZ serves as the direct substitute for the obsolete ZTX658STOB. Both components are manufactured by Diodes Incorporated and share identical electrical and mechanical specifications across all critical parameters. The ZTX658STZ maintains active product status, ensuring long-term availability and supply chain continuity.

Compliance Alignment: Both parts are ROHS3 Compliant, REACH Unaffected, and carry Moisture Sensitivity Level 1 (Unlimited), confirming regulatory and environmental compatibility.

Packaging Consideration: The primary distinction between the two parts is packaging format. The ZTX658STOB is supplied in bulk configuration, while the ZTX658STZ is supplied in Tape & Box (TB) format. This packaging difference does not affect electrical or mechanical performance and reflects standard industry distribution practices for active versus obsolete product lines.

Availability: The ZTX658STZ is currently in active production with 4,300 pieces in stock, providing reliable component availability for new designs and production requirements.

Frequently Asked Questions (FAQ)

Q: Can the ZTX658STZ directly replace the ZTX658STOB in existing circuit designs?

A: Yes. The ZTX658STZ is electrically and mechanically equivalent to the ZTX658STOB across all specified parameters, including voltage rating, current capacity, power dissipation, frequency response, and thermal operating range. Direct substitution is supported without circuit modification.

Q: What is the significance of the packaging difference between these parts?

A: The ZTX658STOB is supplied in bulk packaging, while the ZTX658STZ is supplied in Tape & Box (TB) format. Both use identical E-Line-3 (TO-92 compatible) physical packages with formed leads. The packaging format difference reflects distribution methods for obsolete versus active product lines and does not affect component performance or pin compatibility.

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

A: No. Both the ZTX658STOB and ZTX658STZ carry identical compliance certifications: ROHS3 Compliant, REACH Unaffected, and Moisture Sensitivity Level 1 (Unlimited). They are fully equivalent from a regulatory and environmental standpoint.

Q: Why is the ZTX658STOB classified as obsolete?

A: The ZTX658STOB has reached end-of-life status in the manufacturer's product portfolio. The ZTX658STZ represents the active equivalent part maintained in current production. For new designs and ongoing production requirements, the ZTX658STZ should be specified.

Q: Are the DC current gain and saturation voltage characteristics identical?

A: Yes. Both parts specify DC Current Gain (hFE) minimum of 50 at 100mA collector current and 5V collector-emitter voltage, and Vce Saturation maximum of 500mV at 10mA base current and 100mA collector current. These parameters are identical across both components.

Q: What is the collector cutoff current specification?

A: Both parts specify a maximum collector cutoff current (ICBO) of 100nA. This parameter defines the leakage current when the transistor is in the off state and is identical for both the ZTX658STOB and ZTX658STZ.

Q: Can these parts operate across the full temperature range specified?

A: Yes. Both the ZTX658STOB and ZTX658STZ are rated for junction temperature operation from -55°C to 200°C (TJ), providing equivalent thermal performance across the specified operating range.