TF408-3-TL-HX Equivalent & Substitute Parts

Part Overview

The TF408-3-TL-HX is an N-channel JFET transistor manufactured by onsemi, rated for 10 mA drain current and 30 mW power dissipation in an USFP package. This part has reached obsolete status and is no longer in active production. Locating equivalent substitute components is necessary to maintain design continuity and ensure component availability for new production runs or field replacements.

Substiute Parts

TF408-3-TL-HX

onsemiIn Stock: 1096TF408-3-TL-HX Datasheet

Current PartRFQ

TF412ST5G

onsemiIn Stock: 75795TF412ST5G Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

The TF412ST5G qualifies as a direct substitute for the TF408-3-TL-HX based on the following critical parameters:

• FET Type: Both are N-Channel JFETs
• Drain Current Rating: Both rated at 10 mA maximum
• Manufacturer: Both manufactured by onsemi
• Regulatory Compliance: Both are REACH Unaffected and meet MSL 1 requirements
• Drain to Source Voltage (Vdss): TF412ST5G rated at 30 V, providing adequate voltage headroom for applications designed around the TF408-3-TL-HX

The TF412ST5G represents an active production alternative with superior power rating (100 mW vs. 30 mW), ensuring compatibility with existing circuit designs while offering improved thermal performance and extended component availability.

Parameter Comparison

Engineering Selection Recommendations

The TF412ST5G is the qualified substitute for the obsolete TF408-3-TL-HX. Selection is based on:

• Product Status: TF412ST5G maintains active production status with confirmed inventory availability (75,755 pcs in stock), whereas TF408-3-TL-HX is obsolete
• Regulatory Compliance: Both parts meet REACH Unaffected and MSL 1 requirements; TF412ST5G additionally carries ROHS3 Compliant certification
• Electrical Compatibility: Matching N-Channel JFET topology and 10 mA drain current rating ensure functional equivalence in circuit applications
• Thermal Performance: The increased power rating of TF412ST5G (100 mW vs. 30 mW) provides enhanced thermal margin without requiring circuit redesign

Frequently Asked Questions (FAQ)

Q: Can TF412ST5G directly replace TF408-3-TL-HX in existing designs?

A: Yes. Both parts are N-Channel JFETs with identical 10 mA drain current ratings and compatible voltage specifications. The TF412ST5G's higher power rating (100 mW) ensures thermal compatibility with applications originally designed for the 30 mW TF408-3-TL-HX.

Q: What is the primary reason for substitution?

A: The TF408-3-TL-HX has reached obsolete status and is no longer manufactured. The TF412ST5G is an active production part from the same manufacturer with equivalent electrical characteristics.

Q: Are there packaging differences between these parts?

A: Yes. The TF408-3-TL-HX uses USFP packaging, while the TF412ST5G uses SOT-883 (XDFN3) surface mount packaging. PCB layout modifications may be required for physical integration.

Q: Do both parts meet current regulatory requirements?

A: Both parts are REACH Unaffected and MSL 1 compliant. The TF412ST5G additionally carries ROHS3 Compliant certification, meeting current environmental standards.

Q: What is the inventory status of the substitute part?

A: The TF412ST5G has 75,755 pcs in stock as new original inventory, ensuring reliable supply for production requirements.