SMFE17ALH Equivalent & Substitute Parts

Part Overview

The SMFE17ALH is an active Transient Voltage Suppressor (TVS) diode manufactured by Eaton - Electronics Division. This unidirectional zener diode is designed for transient overvoltage protection in surface mount applications, featuring a 17V reverse standoff voltage and 27.6V maximum clamping voltage. The device is packaged in SOD-123F format and qualifies for automotive applications under AEC-Q101 certification. Equivalent and substitute parts are identified to provide design flexibility, supply chain alternatives, and compatibility options for applications requiring comparable electrical and mechanical characteristics.

Substiute Parts

SMFE17ALH

Eaton - Electronics DivisionIn Stock: 1063SMFE17ALH Datasheet

Current PartRFQ

VTVS19ASMF-HM3-08

Vishay General Semiconductor - Diodes DivisionIn Stock: 42345VTVS19ASMF-HM3-08 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMFE17ALH are identified based on the following electrical and mechanical compatibility criteria:

Electrical Parameters:

• Voltage - Reverse Standoff within acceptable tolerance range
• Voltage - Breakdown (Min) within acceptable tolerance range
• Voltage - Clamping (Max) @ Ipp within acceptable tolerance range
• Current - Peak Pulse (10/1000µs) meeting or exceeding application requirements
• Power - Peak Pulse rating of 400W

Mechanical & Compliance Parameters:

• Unidirectional channel configuration (1 channel)
• Surface mount mounting type
• Automotive grade qualification
• AEC-Q101 certification
• ROHS3 compliance
• Moisture Sensitivity Level 1 (Unlimited)

The VTVS19ASMF-HM3-08 qualifies as a substitute based on these criteria, with allowable variations in package format (DO-219AB versus SOD-123F) and operating temperature range extension, provided the application circuit design accommodates these differences.

Parameter Comparison

Engineering Selection Recommendations

Both the SMFE17ALH and VTVS19ASMF-HM3-08 are active products with automotive-grade qualification and AEC-Q101 certification, meeting regulatory requirements for automotive and industrial applications. Both devices maintain ROHS3 compliance and REACH unaffected status.

The VTVS19ASMF-HM3-08 operates across an extended temperature range (-55°C to 175°C) compared to the SMFE17ALH (-55°C to 150°C), providing additional thermal margin in high-temperature environments. The substitute part exhibits slightly higher clamping voltage (31V versus 27.6V) and lower peak pulse current (12.44A versus 14.5A), requiring circuit-level evaluation to confirm compatibility with specific overvoltage protection requirements.

Package format differs between the two devices: SOD-123F for the SMFE17ALH and DO-219AB for the VTVS19ASMF-HM3-08. PCB layout and footprint modifications are necessary when implementing the substitute part. Both devices are surface mount configurations with identical moisture sensitivity classification.

Frequently Asked Questions (FAQ)

Q: Can the VTVS19ASMF-HM3-08 directly replace the SMFE17ALH without circuit modifications?

A: Direct replacement requires PCB footprint redesign due to package format differences (SOD-123F versus DO-219AB). Electrical parameters differ sufficiently to warrant circuit analysis: the substitute exhibits higher clamping voltage (31V versus 27.6V) and lower peak pulse current (12.44A versus 14.5A). Application-specific validation is required.

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

A: The SMFE17ALH provides lower clamping voltage (27.6V) and higher peak pulse current (14.5A), while the VTVS19ASMF-HM3-08 offers higher clamping voltage (31V) and lower peak pulse current (12.44A). Both maintain 400W peak pulse power rating. Reverse standoff voltages differ by 1.7V (17V versus 18.7V).

Q: Are both devices suitable for automotive applications?

A: Yes. Both the SMFE17ALH and VTVS19ASMF-HM3-08 carry automotive-grade classification and AEC-Q101 qualification, meeting automotive industry standards for reliability and performance.

Q: What is the impact of the extended operating temperature range on the VTVS19ASMF-HM3-08?

A: The VTVS19ASMF-HM3-08 operates to 175°C junction temperature, compared to 150°C for the SMFE17ALH. This extended range provides thermal margin in applications subject to elevated ambient or self-heating conditions, without affecting electrical performance within the specified operating window.

Q: Do both devices have identical moisture sensitivity and compliance status?

A: Yes. Both devices are classified as Moisture Sensitivity Level 1 (Unlimited), ROHS3 compliant, and REACH unaffected, ensuring equivalent handling, storage, and regulatory compliance characteristics.

Q: What PCB design considerations apply when substituting the VTVS19ASMF-HM3-08 for the SMFE17ALH?

A: Package format change from SOD-123F to DO-219AB requires footprint redesign. Physical dimensions and lead spacing differ between packages. PCB layout, trace routing, and component placement must be updated accordingly. Electrical performance validation is required to confirm clamping voltage and current characteristics meet application requirements.