SP0504BAJT Equivalent & Substitute Parts

Part Overview

The SP0504BAJT is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 5.5V reverse standoff voltage and 8.5V maximum clamping voltage in a compact SC-70-5 package. The part is currently classified as obsolete, necessitating identification of equivalent alternatives for ongoing design support and procurement.

Substiute Parts

SP0504BAJT

Littelfuse Inc.In Stock: 2782SP0504BAJT Datasheet

Current PartRFQ

SP0504BAJTG

Littelfuse Inc.In Stock: 8581SP0504BAJTG Datasheet

DirectRFQ

NSQA6V8AW5T2G

onsemiIn Stock: 86073NSQA6V8AW5T2G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SP0504BAJT is determined by the following critical parameters:

• Voltage Rating Compatibility: Reverse standoff voltage and clamping voltage must fall within acceptable operating ranges for the protected circuit
• Package Compatibility: Physical form factor must be SC-70-5 (SOT-353) to ensure PCB footprint compatibility
• Channel Configuration: Unidirectional channel count must match the original specification
• Mounting Type: Surface mount requirement must be maintained
• Temperature Range: Operating temperature specification must support the application environment

Two substitute parts meet these criteria with varying compliance profiles and electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

SP0504BAJTG is the direct functional equivalent from Littelfuse Inc. This part maintains identical electrical specifications (5.5V reverse standoff, 8.5V clamping voltage) and package configuration while offering active product status and ROHS3 compliance. Selection of this substitute eliminates obsolescence risk while preserving original design parameters.

NSQA6V8AW5T2G from onsemi provides an alternative with higher clamping voltage (13V) and extended operating temperature range (-40°C ~ 125°C). This part is suitable for applications requiring enhanced thermal performance or higher transient energy absorption. The elevated clamping voltage requires circuit-level evaluation to confirm compatibility with protected components.

Both substitutes maintain SC-70-5 package compatibility and 4-channel unidirectional configuration. Selection between them depends on whether design specifications require exact electrical parameter matching (SP0504BAJTG) or can accommodate the higher clamping voltage of the onsemi alternative (NSQA6V8AW5T2G).

Frequently Asked Questions (FAQ)

Q: Can SP0504BAJTG be used as a direct replacement for SP0504BAJT?

A: Yes. SP0504BAJTG is electrically and mechanically identical to SP0504BAJT, with matching reverse standoff voltage (5.5V), clamping voltage (8.5V), and SC-70-5 package configuration. The primary differences are active product status and ROHS3 compliance.

Q: What is the key difference between SP0504BAJTG and NSQA6V8AW5T2G?

A: The primary difference is clamping voltage: SP0504BAJTG clamps at 8.5V maximum, while NSQA6V8AW5T2G clamps at 13V maximum. Both maintain identical package form factor and 4-channel configuration. The onsemi part also offers extended operating temperature range to 125°C.

Q: Are all three parts compatible with the same PCB footprint?

A: Yes. All three parts use the SC-70-5 (SOT-353) package, ensuring identical PCB footprint compatibility. No layout modifications are required when substituting between these parts.

Q: Which substitute should be selected for new designs?

A: SP0504BAJTG is recommended for designs requiring exact electrical parameter matching and continued Littelfuse supply chain support. NSQA6V8AW5T2G is suitable for applications where higher clamping voltage and extended temperature range provide design margin benefits.

Q: Does the higher clamping voltage of NSQA6V8AW5T2G affect circuit compatibility?

A: Higher clamping voltage means the protected circuit experiences higher transient voltage peaks. Circuit-level analysis is required to confirm that protected components can tolerate the 13V clamping level without degradation or failure.