ZTX601STOB Equivalent & Substitute Parts

Part Overview

The ZTX601STOB is a Bipolar (BJT) NPN Darlington transistor manufactured by Diodes Incorporated, designed for through-hole applications in the E-Line (TO-92 compatible) package. This component operates at 160 V collector-emitter breakdown voltage with a maximum collector current of 1 A and 1 W power dissipation capability.

The ZTX601STOB is classified as an obsolete product. Locating equivalent substitute parts is necessary to support legacy circuit designs, repair operations, and applications where this specific part number is specified in existing schematics or bill of materials documentation.

Substiute Parts

ZTX601STOB

Diodes IncorporatedIn Stock: 956ZTX601STOB Datasheet

Current PartRFQ

ZTX601STZ

Diodes IncorporatedIn Stock: 2179ZTX601STZ Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the ZTX601STOB is determined by electrical and mechanical parameter equivalence across the following criteria:

Electrical Parameters (Critical for Functional Compatibility):

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

Substitute parts must match all electrical parameters, maintain through-hole mounting compatibility with E-Line (TO-92 compatible) packaging, and satisfy the same regulatory compliance requirements.

Parameter Comparison

Engineering Selection Recommendations

The ZTX601STZ is a direct electrical and mechanical equivalent to the ZTX601STOB. Both components are manufactured by Diodes Incorporated and share identical electrical specifications across all critical parameters: collector current, breakdown voltage, saturation voltage, current gain, power rating, and frequency response. Both operate within the same temperature range and are housed in E-Line (TO-92 compatible) through-hole packages.

The primary distinction between these parts is product status and packaging format. The ZTX601STOB is classified as obsolete, while the ZTX601STZ maintains active product status. The ZTX601STZ is supplied in Tape & Box (TB) packaging, whereas the ZTX601STOB packaging format is not specified in the provided data.

Both components satisfy identical regulatory compliance requirements: ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status. Selection of the ZTX601STZ is appropriate for applications requiring an active, currently manufactured equivalent to the obsolete ZTX601STOB.

Frequently Asked Questions (FAQ)

Q: Can the ZTX601STZ be used as a direct replacement for the ZTX601STOB in existing circuit designs?

A: Yes. The ZTX601STZ is electrically and mechanically equivalent to the ZTX601STOB. All electrical parameters, including collector current, breakdown voltage, saturation voltage, current gain, power dissipation, and frequency response, are identical. Both components use E-Line (TO-92 compatible) through-hole packaging with the same lead configuration and pin spacing.

Q: What is the difference between the ZTX601STOB and ZTX601STZ?

A: The components are electrically identical. The ZTX601STOB is classified as an obsolete product, while the ZTX601STZ is an active product. The ZTX601STZ is supplied in Tape & Box (TB) packaging format. Both meet identical RoHS3, MSL, and REACH compliance requirements.

Q: Are there any compatibility concerns when substituting the ZTX601STZ for the ZTX601STOB?

A: No compatibility concerns exist from an electrical or mechanical standpoint. Both components are NPN Darlington transistors with identical specifications and E-Line (TO-92 compatible) through-hole packaging. The lead configuration and pin spacing are identical, allowing direct board-level substitution.

Q: What is the product status difference, and why does it matter?

A: The ZTX601STOB is obsolete and no longer manufactured. The ZTX601STZ is an active product currently manufactured by Diodes Incorporated. For new designs or ongoing production requirements, the ZTX601STZ is the appropriate selection due to its active status and continued availability.

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

A: Yes. Both the ZTX601STOB and ZTX601STZ are ROHS3 compliant, carry MSL Level 1 (unlimited) moisture sensitivity rating, and are REACH unaffected. Compliance requirements are identical between the two parts.

Q: What is the operating temperature range for these components?

A: Both components operate across a junction temperature range of -55°C to 200°C (TJ), providing identical thermal performance characteristics.