BSS138-G N-Channel MOSFET Equivalent & Substitute Parts

Part Overview

The BSS138-G is an N-Channel MOSFET manufactured by onsemi, rated for 50V drain-to-source voltage with a maximum continuous drain current of 220mA at 25°C. This device is housed in a SOT-23-3 (TO-236) surface mount package and is designed for general-purpose switching and amplification applications. The part is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity level (MSL 1).

Substitute parts are identified when equivalent electrical performance can be achieved within the specified parameter ranges while maintaining package compatibility and compliance certifications. Alternative devices may be required due to inventory availability, supply chain considerations, or design optimization for specific application requirements.

Substiute Parts

BSS138-G

onsemiIn Stock: 3381BSS138-G Datasheet

Current PartRFQ

BSS138BK,215

Nexperia USA Inc.In Stock: 514760BSS138BK,215 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the BSS138-G with alternative N-Channel MOSFETs is determined by the following criteria:

Electrical Compatibility Requirements:

• FET Type must be N-Channel
• Technology must be MOSFET (Metal Oxide)
• Drain-to-Source Voltage (Vdss) must equal or exceed 50V
• Continuous Drain Current (Id) must equal or exceed 220mA at 25°C
• On-state resistance (Rds On) must not exceed 3.5 Ohm at rated conditions
• Operating temperature range must encompass -55°C to 150°C (TJ)

Package and Mechanical Compatibility:

• Mounting type must be Surface Mount
• Package must be SOT-23-3 (TO-236) or equivalent footprint designation (TO-236-3, SC-59)

Compliance Requirements:

• RoHS3 compliance required
• Moisture Sensitivity Level (MSL) of 1 (Unlimited) required

The BSS138BK,215 manufactured by Nexperia USA Inc. meets all substitution criteria and is classified as an equivalent part for the BSS138-G.

Parameter Comparison

Engineering Selection Recommendations

BSS138BK,215 (Nexperia USA Inc.) – Equivalent Substitute

The BSS138BK,215 is a direct functional equivalent to the BSS138-G. Both devices share the same base product number (BSS138) and are manufactured to identical package specifications (SOT-23-3/TO-236). The Nexperia part demonstrates superior electrical performance characteristics:

• Higher Vdss rating (60V vs. 50V) provides increased voltage margin
• Higher continuous drain current capability (360mA vs. 220mA)
• Lower on-state resistance (1.6 Ohm vs. 3.5 Ohm) at comparable gate drive voltage
• Equivalent operating temperature range (-55°C to 150°C)

Both parts maintain RoHS3 compliance and MSL 1 (Unlimited) ratings. The BSS138BK,215 carries AEC-Q101 automotive qualification and operates within the TrenchMOS™ series technology platform. Pin-to-pin compatibility is confirmed through identical package designations (TO-236-3, SC-59, SOT-23-3).

Frequently Asked Questions (FAQ)

Q: Can the BSS138BK,215 be used as a direct replacement for the BSS138-G in existing designs?

A: Yes. Both devices share identical package footprints (SOT-23-3/TO-236) and pin configurations. The BSS138BK,215 provides equal or superior electrical performance across all critical parameters. No PCB layout modifications are required.

Q: What are the key electrical differences between these two parts?

A: The BSS138BK,215 offers higher voltage rating (60V vs. 50V), higher current capability (360mA vs. 220mA), and lower on-state resistance (1.6 Ohm vs. 3.5 Ohm). These differences represent performance improvements rather than limitations for substitution.

Q: Are both parts compliant with the same regulatory standards?

A: Yes. Both the BSS138-G and BSS138BK,215 are RoHS3 compliant with MSL 1 (Unlimited) ratings. The BSS138BK,215 additionally carries AEC-Q101 automotive qualification.

Q: Do these parts have identical gate charge characteristics?

A: No. The BSS138-G specifies 2.4 nC gate charge at 10V, while the BSS138BK,215 specifies 0.7 nC gate charge at 4.5V. The lower gate charge of the Nexperia part may result in faster switching performance in gate-driven applications.

Q: What is the moisture sensitivity level for both parts?

A: Both devices are rated MSL 1 (Unlimited), indicating no moisture sensitivity restrictions for storage, handling, or reflow soldering processes.

Q: Are there any thermal performance differences?

A: The BSS138BK,215 provides additional thermal performance data with a maximum power dissipation of 1.14W at Tc (case temperature), compared to the BSS138-G specification of 360mW at Ta (ambient temperature). This indicates enhanced thermal management capability in the Nexperia device.

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

A: Yes. Both devices operate across the same temperature range (-55°C to 150°C) and share compatible package specifications. The lower gate charge of the BSS138BK,215 may provide switching speed advantages in high-frequency circuits.