ZTX855STZ Equivalent & Substitute Parts

Part Overview

The ZTX855STZ is an NPN bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a maximum collector current of 4 A, collector-emitter breakdown voltage of 150 V, and maximum power dissipation of 1.2 W. The ZTX855STZ is supplied in Tape & Box packaging with Through Hole E-Line (TO-92 compatible) mounting. The part maintains Active product status and is RoHS3 compliant with unlimited moisture sensitivity level rating. Substitute parts are identified to provide equivalent electrical and mechanical performance for applications requiring alternative packaging formats or inventory sourcing.

Substiute Parts

ZTX855STZ

Diodes IncorporatedIn Stock: 111931ZTX855STZ Datasheet

Current PartRFQ

ZTX855

Diodes IncorporatedIn Stock: 4204ZTX855 Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ZTX855STZ are identified based on electrical and mechanical parameter equivalence. The substitution criteria are strictly limited to the following parameters:

• Transistor Type: NPN
• Current - Collector (Ic) (Max): 4 A
• Voltage - Collector Emitter Breakdown (Max): 150 V
• Vce Saturation (Max) @ Ib, Ic: 260mV @ 400mA, 4A
• Current - Collector Cutoff (Max): 50nA (ICBO)
• DC Current Gain (hFE) (Min) @ Ic, Vce: 100 @ 1A, 5V
• Power - Max: 1.2 W
• Frequency - Transition: 90MHz
• Operating Temperature: -55°C ~ 200°C (TJ)
• Mounting Type: Through Hole
• Package / Case: E-Line-3
• Supplier Device Package: E-Line (TO-92 compatible)
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)
• REACH Status: REACH Unaffected

Parts meeting all these electrical and mechanical specifications are classified as direct substitutes. Packaging format variations (Tape & Box versus Bulk) do not affect electrical equivalence and are considered interchangeable for component selection purposes.

Parameter Comparison

Engineering Selection Recommendations

The ZTX855 in Bulk packaging is a direct electrical and mechanical equivalent to the ZTX855STZ. Both parts are manufactured by Diodes Incorporated and maintain identical electrical specifications across all critical parameters including collector current, breakdown voltage, saturation characteristics, current gain, power rating, and frequency response. Both parts operate across the same temperature range and are mounted identically in Through Hole E-Line (TO-92 compatible) packages.

Both the ZTX855STZ and ZTX855 maintain Active product status, ensuring continued availability and manufacturing support. Compliance certifications are identical: both are RoHS3 compliant, REACH unaffected, and carry unlimited moisture sensitivity level rating. The only distinction between these parts is the packaging format—Tape & Box versus Bulk—which does not affect electrical performance or functional compatibility.

Selection between ZTX855STZ and ZTX855 should be based on packaging requirements, inventory availability, and procurement specifications. The electrical performance and reliability characteristics are equivalent.

Frequently Asked Questions (FAQ)

Q: Can the ZTX855 (Bulk packaging) be used as a direct replacement for the ZTX855STZ (Tape & Box packaging)?

A: Yes. The ZTX855 is electrically and mechanically equivalent to the ZTX855STZ. All electrical parameters, operating characteristics, and compliance certifications are identical. The packaging format difference does not affect component functionality or performance in circuit applications.

Q: What are the critical electrical parameters that define substitution compatibility for the ZTX855STZ?

A: Substitution compatibility is determined by the following parameters: NPN transistor type, 4 A maximum collector current, 150 V collector-emitter breakdown voltage, 260mV saturation voltage at specified conditions, 50nA maximum collector cutoff current, 100 minimum DC current gain at 1A and 5V, 1.2 W maximum power dissipation, 90MHz transition frequency, and -55°C to 200°C operating temperature range.

Q: Are the E-Line-3 package and E-Line (TO-92 compatible) package specifications identical between the main part and substitute?

A: Yes. Both the ZTX855STZ and ZTX855 use identical E-Line-3 package specifications with E-Line (TO-92 compatible) supplier device packaging. The physical dimensions, pin configuration, and mounting characteristics are equivalent.

Q: Do both parts meet the same compliance and regulatory requirements?

A: Yes. Both the ZTX855STZ and ZTX855 are RoHS3 compliant, REACH unaffected, and carry MSL Level 1 (Unlimited) moisture sensitivity rating. Regulatory and environmental compliance is identical.

Q: What is the difference between Tape & Box and Bulk packaging formats?

A: Tape & Box packaging supplies components on tape wound on reels and boxed for shipment, typically used for automated assembly processes. Bulk packaging supplies loose components in containers, typically used for manual assembly or smaller quantity requirements. The electrical and mechanical specifications of the component itself remain unchanged.

Q: Is the ZTX855 available in the same quantities as the ZTX855STZ?

A: Inventory levels differ between packaging formats. The ZTX855STZ (Tape & Box) has 111,900 pieces in stock, while the ZTX855 (Bulk) has 4,150 pieces in stock. Availability should be confirmed based on specific procurement requirements.

Q: Can these parts be used interchangeably in high-frequency switching applications?

A: Yes. Both parts maintain identical 90MHz transition frequency specifications and are suitable for equivalent high-frequency switching applications within the specified operating parameters.