ZTX601ASTZ Equivalent & Substitute Parts

Part Overview

The ZTX601ASTZ is an NPN Darlington bipolar junction transistor manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This device features a 160 V collector-emitter breakdown voltage, 1 A maximum collector current, and 1 W power dissipation capability in a through-hole E-Line (TO-92 compatible) package.

The ZTX601ASTZ is classified as obsolete. Equivalent substitute parts are available in active product status, offering identical electrical and mechanical specifications with improved supply chain availability and ongoing manufacturer support.

Substiute Parts

ZTX601ASTZ

Diodes IncorporatedIn Stock: 1107ZTX601ASTZ Datasheet

Current PartRFQ

ZTX601QSTZ

Diodes IncorporatedIn Stock: 1095ZTX601QSTZ Datasheet

Parametric EquivalentRFQ

ZTX601STZ

Diodes IncorporatedIn Stock: 2179ZTX601STZ Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ZTX601ASTZ are determined by equivalence across all critical electrical and mechanical parameters. The substitution logic is based on the following criteria:

Electrical Parameters (Must Match):

• Transistor Type: NPN - Darlington
• Maximum Collector Current (Ic): 1 A
• Collector-Emitter Breakdown Voltage: 160 V
• Vce Saturation: 1.2V @ 10mA, 1A
• Collector Cutoff Current: 10µA
• DC Current Gain (hFE): 2000 @ 500mA, 10V
• Maximum Power Dissipation: 1 W
• Transition Frequency: 250 MHz
• Operating Temperature Range: -55°C to 200°C

Mechanical Parameters (Must Match):

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

Compliance Parameters (Must Match):

• RoHS Status: ROHS3 Compliant
• REACH Status: REACH Unaffected

All substitute parts listed maintain identical electrical performance and physical compatibility with the ZTX601ASTZ, with the primary distinction being product status and packaging format.

Parameter Comparison

Engineering Selection Recommendations

ZTX601STZ is the primary substitute for the obsolete ZTX601ASTZ. This part maintains active product status with Diodes Incorporated, ensuring ongoing availability and manufacturer support. All electrical specifications, mechanical dimensions, and compliance certifications are identical to the ZTX601ASTZ. The ZTX601STZ is supplied in Tape & Box (TB) packaging format, suitable for both manual and automated assembly processes. Current inventory levels support immediate procurement.

ZTX601QSTZ is an alternative substitute offering identical electrical and mechanical specifications. This part is also in active product status and maintains full compliance with RoHS3 and REACH requirements. The ZTX601QSTZ is supplied in Tape & Box (TB) packaging format. Selection between ZTX601STZ and ZTX601QSTZ should be based on supplier availability, lead time requirements, and packaging preferences for the specific application.

Both substitute parts are direct functional replacements for the ZTX601ASTZ with no circuit modifications required. The transition from the obsolete ZTX601ASTZ to either active substitute part presents no electrical or mechanical compatibility issues.

Frequently Asked Questions (FAQ)

Q: Can ZTX601STZ or ZTX601QSTZ be used as direct replacements for ZTX601ASTZ in existing designs?

A: Yes. Both ZTX601STZ and ZTX601QSTZ are direct functional replacements. All electrical parameters, including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and frequency response are identical. The through-hole E-Line (TO-92 compatible) package dimensions and pin configuration are unchanged. No circuit modifications or PCB layout changes are required.

Q: What is the primary difference between ZTX601ASTZ and its substitutes?

A: The ZTX601ASTZ is classified as obsolete, while ZTX601STZ and ZTX601QSTZ are active products. The substitutes offer improved supply chain availability and ongoing manufacturer support. The packaging format differs (the original uses standard packaging while substitutes are supplied in Tape & Box format), but electrical and mechanical specifications remain identical.

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

A: No. All three parts—ZTX601ASTZ, ZTX601STZ, and ZTX601QSTZ—are ROHS3 Compliant and REACH Unaffected. They meet identical environmental and regulatory requirements.

Q: How do I choose between ZTX601STZ and ZTX601QSTZ?

A: Both parts are electrically and mechanically equivalent. Selection should be based on supplier availability, lead time, pricing, and packaging preferences. Consult with your component supplier for current stock levels and delivery schedules.

Q: Will the Tape & Box (TB) packaging of the substitutes affect assembly compatibility?

A: No. Tape & Box packaging is standard for automated and manual assembly processes. The individual component specifications and pin configuration remain unchanged. Verify that your assembly equipment supports standard E-Line (TO-92 compatible) tape specifications if using automated pick-and-place systems.

Q: Are there any thermal or operating condition differences?

A: No. All three parts operate across the identical temperature range of -55°C to 200°C (junction temperature). Maximum power dissipation, thermal characteristics, and operating conditions are equivalent.