SP0502BAJT Equivalent & Substitute Parts

Part Overview

The SP0502BAJT is a Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose ESD and transient protection in surface-mount applications. This unidirectional Zener diode operates with a 5.5V reverse standoff voltage and 8.5V clamping voltage, packaged in SC-70 (SOT-323) form factor.

The SP0502BAJT is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this component.

Substiute Parts

SP0502BAJT

Littelfuse Inc.In Stock: 7369SP0502BAJT Datasheet

Current PartRFQ

SP0502BAJTG

Littelfuse Inc.In Stock: 18597SP0502BAJTG Datasheet

DirectRFQ

DF3A6.8FUT1G

onsemiIn Stock: 65440DF3A6.8FUT1G Datasheet

MFR RecommendedRFQ

ESD7002WTT1G

onsemiIn Stock: 27997ESD7002WTT1G Datasheet

MFR RecommendedRFQ

SZESD7002WTT1G

onsemiIn Stock: 1444SZESD7002WTT1G Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SP0502BAJT is determined by the following critical parameters:

Primary Substitution Criteria:

• Package / Case: SC-70 (SOT-323) form factor
• Unidirectional Channels: 2
• Type: Zener TVS diode
• Voltage - Reverse Standoff: 5.5V nominal range
• Voltage - Clamping: 8.5V nominal range
• Mounting Type: Surface Mount

Substitution Groups:

Group 1 - Direct Equivalent (Littelfuse Series) SP0502BAJTG is a direct manufacturer equivalent from Littelfuse Inc., maintaining identical electrical specifications and package configuration. This part differs only in product status (Active vs. Obsolete) and RoHS compliance (ROHS3 Compliant vs. non-compliant).

Group 2 - Cross-Manufacturer Alternatives (onsemi) DF3A6.8FUT1G, ESD7002WTT1G, and SZESD7002WTT1G are onsemi TVS diodes in SC-70 packaging. These parts maintain the same package and mounting type but exhibit variations in voltage specifications and performance characteristics. Substitution requires verification of application-specific voltage and current requirements.

Parameter Comparison

Engineering Selection Recommendations

SP0502BAJTG (Littelfuse Inc.) This is the recommended primary substitute. It maintains identical electrical specifications and package configuration as the SP0502BAJT while offering Active product status and ROHS3 compliance. Selection of this part eliminates obsolescence risk and satisfies modern regulatory requirements without design modification.

DF3A6.8FUT1G (onsemi) This part is suitable for applications requiring extended operating temperature range (-55°C to 150°C junction temperature) and automotive-grade qualification (AEC-Q101). The higher clamping voltage (16V) and peak pulse current (9.37A) indicate suitability for higher-energy transient protection scenarios. Application-specific voltage compatibility must be confirmed.

ESD7002WTT1G (onsemi) This part is specified for HDMI and USB applications with low capacitance (0.3pF @ 1MHz). The extended operating temperature range (-55°C to 125°C) and ROHS3 compliance support modern consumer electronics. Clamping voltage specification is not provided; application requirements must be verified.

SZESD7002WTT1G (onsemi) This low-capacitance ESD protection device is qualified for automotive applications (AEC-Q101) with extended temperature range (-55°C to 125°C). The 10.8V typical clamping voltage and 16A peak pulse current provide higher transient handling capability. The 16V maximum reverse standoff voltage differs from the original specification and requires application verification.

Frequently Asked Questions (FAQ)

Q: Can SP0502BAJTG be used as a direct replacement for SP0502BAJT? A: Yes. SP0502BAJTG is a direct equivalent with identical electrical specifications (5.5V reverse standoff, 8.5V clamping voltage) and SC-70 packaging. The primary differences are Active product status and ROHS3 compliance, which are improvements over the obsolete original part.

Q: What is the key difference between the Littelfuse and onsemi substitute options? A: SP0502BAJTG maintains exact electrical specifications. The onsemi alternatives (DF3A6.8FUT1G, ESD7002WTT1G, SZESD7002WTT1G) offer different voltage ratings and performance characteristics. Selection depends on application-specific transient protection requirements and operating conditions.

Q: Are all substitute parts available in the same SC-70 package? A: Yes. All listed substitute parts use SC-70 (SOT-323) surface-mount packaging, ensuring mechanical and footprint compatibility with the original SP0502BAJT design.

Q: Which substitute part offers the best compliance profile? A: All active substitute parts (SP0502BAJTG, DF3A6.8FUT1G, ESD7002WTT1G, SZESD7002WTT1G) are ROHS3 compliant and REACH unaffected. SP0502BAJTG and SZESD7002WTT1G additionally carry automotive-grade qualification (AEC-Q101), suitable for automotive and high-reliability applications.

Q: What operating temperature range should I consider when selecting a substitute? A: The original SP0502BAJT operates from -40°C to 85°C (ambient). All onsemi substitutes extend this range to -55°C to 125°C or -55°C to 150°C (junction temperature), providing improved thermal performance. SP0502BAJTG maintains the original -40°C to 85°C specification.

Q: Can onsemi parts with different clamping voltages be used interchangeably? A: No. Clamping voltage directly affects transient protection performance. DF3A6.8FUT1G (16V clamp) and SZESD7002WTT1G (10.8V typical clamp) differ from the original 8.5V specification. Substitution requires confirmation that the alternative clamping voltage is compatible with circuit protection requirements.