TSMBJ0318C Equivalent & Substitute Parts

Part Overview

The TSMBJ0318C is a 220V off-state transient voltage suppressor thyristor manufactured by Micro Commercial Co, housed in a DO-214AA (SMB) surface mount package. This component is rated for 150 A peak pulse current (8/20µs) and features a 300V breakover voltage with 5V on-state voltage. The part is currently obsolete, making equivalent substitutes necessary for ongoing design support and procurement.

Substiute Parts

TSMBJ0318C

Micro Commercial CoIn Stock: 1136TSMBJ0318C Datasheet

Current PartRFQ

TB2600M-13-F

Diodes IncorporatedIn Stock: 25180TB2600M-13-F Datasheet

DirectRFQ

K2400SRP

Littelfuse Inc.In Stock: 3321K2400SRP Datasheet

SimilarRFQ

K2500SRP

Littelfuse Inc.In Stock: 3740K2500SRP Datasheet

SimilarRFQ

P2600SBLRP

Littelfuse Inc.In Stock: 3062P2600SBLRP Datasheet

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P2600SCLRP

Littelfuse Inc.In Stock: 7793P2600SCLRP Datasheet

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P2600SCMCLRP

Littelfuse Inc.In Stock: 1485P2600SCMCLRP Datasheet

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SMTBJ200B

Littelfuse Inc.In Stock: 2950SMTBJ200B Datasheet

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SMTPA220

STMicroelectronicsIn Stock: 3747SMTPA220 Datasheet

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TISP4290H3BJR-S

Bourns Inc.In Stock: 2799TISP4290H3BJR-S Datasheet

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TISP4290T3BJR-S

Bourns Inc.In Stock: 933TISP4290T3BJR-S Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the TSMBJ0318C is determined by the following critical parameters:

• Off-State Voltage: Must be 220V to maintain circuit protection threshold
• Breakover Voltage: Must be 300V or within acceptable tolerance
• Current Rating (8/20µs): Must support minimum 150A peak pulse capability
• On-State Voltage: Should be ≤5V for minimal voltage drop
• Package: Must be DO-214AA (SMB) for PCB compatibility
• Hold Current: Must be 150mA or lower

Substitute parts are grouped into two categories: direct functional equivalents with equal or superior current ratings, and similar parts with comparable electrical characteristics within the 220V protection class.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Direct Equivalents)

TB2600M-13-F (Diodes Incorporated) provides the closest functional match with 220V off-state voltage, 300V breakover, and 250A peak pulse rating. This part exceeds the original 150A requirement while maintaining identical hold current and package specifications. Active product status and ROHS3 compliance support long-term availability.

P2600SCMCLRP (Littelfuse Inc.) matches the original on-state voltage of 5V and maintains 220V/300V voltage ratings. The 400A peak pulse capability provides additional margin. ROHS3 compliance and active status ensure procurement continuity.

SMTPA220 (STMicroelectronics) delivers identical current ratings (150A/50A) and package compatibility. The 293V breakover voltage remains within acceptable tolerance of the 300V specification. Active product status and ROHS3 compliance support design transitions.

Secondary Substitutes (Comparable Performance)

P2600SBLRP and TISP4290T3BJR-S both provide 250A peak pulse capability with 220V off-state voltage and DO-214AA packaging. These parts offer improved current handling over the original specification while maintaining electrical compatibility.

TISP4290H3BJR-S delivers 300A peak pulse performance with 220V off-state voltage and 290V breakover. This part provides the highest current margin among available substitutes.

Not Recommended

SMTBJ200B operates at 200V off-state voltage, which falls below the 220V requirement of the original circuit. This part is unsuitable for direct substitution despite active status.

K2400SRP and K2500SRP are Diac/Sidac thyristors with significantly lower current ratings (1A peak output) and different electrical characteristics. These parts are not functionally equivalent.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with higher peak pulse current than the original 150A specification?

A: Yes. Higher current ratings provide additional safety margin and do not compromise circuit function. Parts rated for 250A, 300A, or 400A are fully compatible when other parameters match.

Q: What is the significance of the 300V breakover voltage?

A: Breakover voltage determines the transient threshold at which the thyristor activates. The 300V specification must be maintained or closely matched (within ±10V) to ensure proper circuit protection timing.

Q: Are there packaging considerations when substituting these parts?

A: All listed substitutes use the DO-214AA (SMB) package, ensuring direct PCB footprint compatibility. No layout modifications are required.

Q: Why is RoHS compliance important for this selection?

A: ROHS3 compliance indicates the part meets current environmental and material restrictions. Active products with ROHS3 certification ensure long-term supply chain support and regulatory alignment.

Q: Can I substitute TSMBJ0318C with SMTBJ200B?

A: No. SMTBJ200B operates at 200V off-state voltage, which is below the 220V requirement. This creates inadequate protection margin and is not a valid substitute.

Q: What is the difference between peak pulse ratings (8/20µs) and (10/1000µs)?

A: These represent different transient waveform profiles. The 8/20µs rating applies to fast transients, while 10/1000µs applies to slower surge events. Both must be considered for complete circuit protection analysis.

Q: Is on-state voltage critical for substitution?

A: On-state voltage affects power dissipation during conduction. Lower values (2V–4V) reduce heat generation. The original 5V specification can be matched or improved with substitutes rated at 3V–5V without functional impact.