SM8SF33A-Q Equivalent & Substitute Parts

Part Overview

The SM8SF33A-Q is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Bourns Inc., designed for surface mount applications in automotive-grade circuits. This component provides transient overvoltage protection with a 33V reverse standoff voltage and 53.3V maximum clamping voltage. The part is actively produced and maintains AEC-Q101 automotive qualification with ROHS3 compliance. Equivalent and substitute parts are identified to support procurement flexibility, inventory management, and design continuity across manufacturing environments.

Substiute Parts

SM8SF33A-Q

Bourns Inc.In Stock: 824SM8SF33A-Q Datasheet

Current PartRFQ

SM8T33AH

Eaton - Electronics DivisionIn Stock: 1625SM8T33AH Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SM8SF33A-Q is determined by strict equivalence across the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 33V
• Voltage - Breakdown (Min): 36.7V
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Unidirectional Channels: 1
• Operating Temperature Range: -55°C ~ 175°C (TJ)
• Grade: Automotive
• Qualification: AEC-Q101
• RoHS Status: ROHS3 Compliant

The substitute part SM8T33AH meets all critical voltage and thermal specifications. Differences in package form factor (DO-218AB vs. 2-LDFN) and peak pulse current rating (150A vs. 131A) do not preclude substitution when circuit board layout and thermal management accommodate the alternative package geometry. The higher peak pulse current of the substitute part provides additional margin in transient protection capability.

Parameter Comparison

Engineering Selection Recommendations

Both the SM8SF33A-Q and SM8T33AH are active production components with identical automotive-grade qualification (AEC-Q101) and ROHS3 compliance. Selection between these parts is determined by package footprint compatibility and board layout constraints.

The SM8SF33A-Q in 2-LDFN package is suitable for compact surface mount designs with space limitations. The SM8T33AH in DO-218AB (SMCJ) package accommodates applications where larger package geometry is acceptable or preferred for thermal dissipation. The SM8T33AH provides higher peak pulse current (150A) and power dissipation (8kW) ratings, offering additional transient protection margin in high-stress environments.

Both parts maintain identical voltage specifications (33V standoff, 53.3V clamp) and operating temperature range (-55°C to 175°C), ensuring functional equivalence in circuit protection performance.

Frequently Asked Questions (FAQ)

Q: Can SM8T33AH replace SM8SF33A-Q in existing designs?

A: Yes, provided the circuit board layout accommodates the DO-218AB (SMCJ) package footprint. Electrical performance is equivalent across all critical voltage and thermal parameters. PCB redesign may be required to integrate the larger package geometry.

Q: What is the primary difference between these two parts?

A: The primary difference is package form factor. SM8SF33A-Q uses 2-LDFN (8.1x10.5mm) for compact applications, while SM8T33AH uses DO-218AB (SMCJ) for larger footprint designs. SM8T33AH also provides higher peak pulse current (150A vs. 131A) and power dissipation (8kW vs. 7kW).

Q: Are both parts automotive-qualified?

A: Yes. Both SM8SF33A-Q and SM8T33AH hold AEC-Q101 automotive qualification and ROHS3 compliance, meeting automotive industry standards for reliability and environmental compliance.

Q: Do these parts have identical voltage specifications?

A: Yes. Both parts share identical reverse standoff voltage (33V), breakdown voltage (36.7V minimum), and clamping voltage (53.3V maximum), ensuring equivalent transient protection performance.

Q: What is the operating temperature range for both parts?

A: Both parts operate across -55°C to 175°C junction temperature (TJ), providing equivalent thermal performance in automotive environments.

Q: Are there any moisture sensitivity concerns?

A: No. Both parts have Moisture Sensitivity Level (MSL) 1, indicating unlimited shelf life without moisture control requirements.