ZTX618 Equivalent & Substitute Parts

Part Overview

The ZTX618 is an NPN bipolar junction transistor (BJT) manufactured by Diodes Incorporated, designed for general-purpose switching and amplification applications. This through-hole component operates at a maximum collector current of 3.5 A with a collector-emitter breakdown voltage of 20 V and a maximum power dissipation of 1 W. The device is housed in an E-Line (TO-92 compatible) package and is classified as Active product status with full RoHS3 compliance. Identifying equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain performance specifications across production runs.

Substiute Parts

ZTX618

Diodes IncorporatedIn Stock: 3267ZTX618 Datasheet

Current PartRFQ

ZTX618

Diodes IncorporatedIn Stock: 3267ZTX618 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ZTX618 are identified based on strict parametric equivalence across the following critical specifications:

Electrical Parameters:

• Transistor polarity: NPN configuration
• Maximum collector current: 3.5 A
• Collector-emitter breakdown voltage: 20 V
• Saturation voltage: 255 mV @ 50mA, 3.5A
• Collector cutoff current: 100 nA
• Minimum DC current gain (hFE): 300 @ 200mA, 2V
• Maximum power dissipation: 1 W
• Transition frequency: 100 MHz

Mechanical & Environmental Parameters:

• Mounting type: Through Hole
• Package designation: E-Line-3 (TO-92 compatible)
• Operating temperature range: -55°C to 200°C (TJ)
• Moisture sensitivity: MSL 1 (Unlimited)

Compliance & Regulatory Parameters:

• RoHS3 compliance status
• REACH unaffected classification

Substitute parts must match all electrical parameters within the specified tolerances, maintain identical through-hole mounting characteristics, and preserve all regulatory compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The ZTX618 is an Active product with full RoHS3 compliance and REACH unaffected status, making it suitable for current production designs and long-term supply chain planning. The substitute part identified (ZTX618) maintains complete parametric equivalence across all electrical, mechanical, and environmental specifications.

Selection of substitute parts should be based on:

1. Product Status Alignment: Both the main part and substitute are classified as Active, ensuring continued manufacturer support and availability.

2. Regulatory Compliance: Both parts maintain identical RoHS3 compliance and REACH unaffected status, satisfying environmental and regulatory requirements for industrial and commercial applications.

3. Parametric Equivalence: The substitute part matches all critical electrical parameters including collector current, breakdown voltage, saturation characteristics, and frequency response, ensuring direct functional replacement without circuit redesign.

4. Package Compatibility: Both parts utilize the E-Line-3 (TO-92 compatible) through-hole package, permitting direct board-level substitution without PCB layout modifications.

5. Thermal and Environmental Performance: Identical operating temperature range (-55°C to 200°C) and MSL rating (1 - Unlimited) ensure equivalent performance across all specified environmental conditions.

Frequently Asked Questions (FAQ)

Q: Can the ZTX618 substitute be used as a direct replacement in existing designs?

A: Yes. The substitute part is parametrically identical to the main part across all electrical, mechanical, and environmental specifications. Direct substitution is possible without circuit modifications or performance degradation.

Q: Are there any package compatibility concerns when substituting the ZTX618?

A: No. Both the main part and substitute use the E-Line-3 (TO-92 compatible) through-hole package. Pin configuration, lead spacing, and mounting requirements are identical, permitting direct PCB-level replacement.

Q: Does the substitute part maintain the same regulatory compliance status?

A: Yes. The substitute part is RoHS3 compliant and REACH unaffected, matching the compliance profile of the main part. No regulatory or environmental qualification changes are required.

Q: What are the critical electrical parameters that define substitution eligibility for the ZTX618?

A: Substitution eligibility is determined by matching the following parameters: NPN transistor type, 3.5 A maximum collector current, 20 V collector-emitter breakdown voltage, 255 mV saturation voltage at specified bias conditions, 100 nA collector cutoff current, 300 minimum DC current gain, 1 W maximum power dissipation, and 100 MHz transition frequency.

Q: Is the operating temperature range identical between the main part and substitute?

A: Yes. Both parts operate across the identical temperature range of -55°C to 200°C (junction temperature), ensuring equivalent thermal performance in all specified applications.

Q: What is the moisture sensitivity level for the ZTX618 and its substitute?

A: Both parts are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions. Standard handling and storage procedures apply without special desiccant or humidity control requirements.

Q: Are there any frequency or switching speed differences between the main part and substitute?

A: No. Both parts maintain an identical transition frequency of 100 MHz, ensuring equivalent high-frequency performance and switching characteristics in amplification and switching applications.