MCH4021-TL-E Equivalent & Substitute Parts

Part Overview

The MCH4021-TL-E is an RF transistor manufactured by onsemi, classified as a Bipolar Junction Transistor (BJT) with NPN polarity. This component is designed for RF applications operating at frequencies up to 16GHz with a maximum power dissipation of 400mW. The device is currently listed as obsolete, which necessitates identification of equivalent or substitute components for ongoing design requirements or production continuity. The part is available in surface mount packaging (4-MCPH) with 3400 units currently in stock.

Substiute Parts

MCH4021-TL-E

onsemiIn Stock: 3454MCH4021-TL-E Datasheet

Current PartRFQ

MAPR-000912-500S00

MACOM Technology SolutionsIn Stock: 1006MAPR-000912-500S00 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MCH4021-TL-E requires evaluation of electrical and mechanical compatibility based on the following critical parameters:

Transistor Type: Both the main part and substitute must be NPN-type bipolar junction transistors to maintain circuit functionality.

Voltage Rating: The MCH4021-TL-E operates at a maximum collector-emitter breakdown voltage of 8V. Substitute parts must support this voltage specification or higher to ensure safe operation within the intended application.

Frequency Performance: The transition frequency of 16GHz defines the RF operating range. Substitute components must meet or exceed this frequency specification for RF applications.

Power Dissipation: Maximum power rating of 400mW establishes thermal and electrical limits. Substitutes must support equivalent or greater power handling capability.

Current Rating: Maximum collector current of 150mA defines the current-handling capacity. Substitute parts must accommodate this current level.

Mounting and Packaging: The surface mount 4-MCPH package is a critical mechanical parameter. Substitutes must be compatible with the same or equivalent package footprint for PCB integration.

Compliance and Status: Product status and regulatory compliance (REACH, RoHS, ECCN) influence long-term availability and supply chain viability.

The identified substitute MAPR-000912-500S00 represents a different application class (chassis mount, higher power) and does not meet the surface mount packaging requirement or the frequency specification of the MCH4021-TL-E. This part is listed in the provided substitute data but does not qualify as a direct functional equivalent.

Parameter Comparison

Engineering Selection Recommendations

Primary Consideration: The MCH4021-TL-E is classified as obsolete. For applications requiring this component, sourcing from existing inventory (3400 units currently available) is the most direct path to maintain design continuity without redesign.

Substitute Evaluation: The MAPR-000912-500S00 listed in the substitute data does not qualify as a functional equivalent for direct replacement. The key incompatibilities are:

1. Mounting Technology: The MCH4021-TL-E uses surface mount technology (4-MCPH), while the MAPR-000912-500S00 is a chassis mount component. These represent fundamentally different application classes and cannot be interchanged on the same PCB.

2. Frequency Specification: The MCH4021-TL-E is specified for 16GHz RF operation. The MAPR-000912-500S00 does not provide frequency transition data, indicating it is not designed for the same RF frequency range.

3. Power and Current Ratings: While the MAPR-000912-500S00 exceeds the power and current specifications of the MCH4021-TL-E, this represents a different device class (high-power, low-frequency) rather than a suitable substitute.

Compliance Status: Both components carry ECCN EAR99 classification and MSL Level 1 (Unlimited) moisture sensitivity. The MAPR-000912-500S00 is RoHS3 compliant and currently active in production, whereas the MCH4021-TL-E is obsolete.

Recommendation: For applications currently using the MCH4021-TL-E, evaluate the available inventory of 3400 units to support production requirements. For new designs or long-term production planning, consult with RF component specialists to identify surface mount NPN transistors with equivalent 16GHz frequency performance and 400mW power rating from active manufacturers.

Frequently Asked Questions (FAQ)

Q: Can the MAPR-000912-500S00 be used as a direct replacement for the MCH4021-TL-E?

A: No. The MAPR-000912-500S00 is a chassis mount component, while the MCH4021-TL-E is surface mount. These represent different mounting technologies and cannot be interchanged on the same printed circuit board. Additionally, the MAPR-000912-500S00 does not provide frequency transition specifications required for RF applications at 16GHz.

Q: What are the critical parameters for substituting the MCH4021-TL-E?

A: A suitable substitute must meet the following specifications: NPN transistor type, 8V or higher collector-emitter breakdown voltage, 16GHz or higher transition frequency, 400mW or greater power dissipation, 150mA or greater collector current rating, and surface mount packaging compatible with 4-MCPH footprint.

Q: Why is the MCH4021-TL-E listed as obsolete?

A: The product status reflects that onsemi has discontinued this component. However, 3400 units are currently available in inventory, providing a supply window for existing applications.

Q: What is the significance of the 1.2dB noise figure specification?

A: The noise figure of 1.2dB at 1GHz indicates the RF noise performance of the transistor. This parameter is critical for low-noise RF amplifier applications. Substitute components must provide equivalent or superior noise figure performance for the same application.

Q: Are there packaging considerations when selecting a substitute?

A: Yes. The MCH4021-TL-E uses a 4-SMD flat lead surface mount package (4-MCPH). Any substitute must use compatible surface mount packaging to maintain PCB assembly compatibility. Chassis mount or through-hole alternatives require complete circuit redesign.

Q: What does MSL Level 1 (Unlimited) mean for this component?

A: Moisture Sensitivity Level 1 (Unlimited) indicates that the component has no moisture sensitivity restrictions. It does not require special moisture control during storage, handling, or assembly, simplifying supply chain and manufacturing processes.

Q: How does the gain specification affect substitution?

A: The MCH4021-TL-E provides 17.5dB gain. Substitute components with significantly different gain values will alter circuit performance and may require redesign of matching networks or bias circuits. Gain compatibility is essential for maintaining RF amplifier performance.