TSMBJ0322C Equivalent & Substitute Parts

Part Overview

The TSMBJ0322C is a 275V off-state, 150A peak pulse (8/20µs) TVS thyristor in DO-214AA (SMB) surface mount package manufactured by Micro Commercial Co. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates with a 350V breakover voltage and 5V on-state voltage, designed for transient voltage suppression applications requiring SMB package compatibility.

Substiute Parts

TSMBJ0322C

Micro Commercial CoIn Stock: 1151TSMBJ0322C Datasheet

Current PartRFQ

TB3100M-13-F

Diodes IncorporatedIn Stock: 15575TB3100M-13-F Datasheet

DirectRFQ

P3100SCMCLRP

Littelfuse Inc.In Stock: 8257P3100SCMCLRP Datasheet

SimilarRFQ

SMTPA270

STMicroelectronicsIn Stock: 4219SMTPA270 Datasheet

SimilarRFQ

TISP4350H3BJR-S

Bourns Inc.In Stock: 35309TISP4350H3BJR-S Datasheet

SimilarRFQ

TISP4350T3BJR-S

Bourns Inc.In Stock: 6161TISP4350T3BJR-S Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TSMBJ0322C is determined by the following critical parameters:

• Voltage - Off State: Must be 275V (exact match required for circuit protection threshold)
• Voltage - Breakover: Must be 350V (exact match required for triggering characteristics)
• Current - Hold (Ih): Must be 150mA (exact match required for holding current specification)
• Package / Case: Must be DO-214AA, SMB (mechanical and thermal compatibility)
• Mounting Type: Must be Surface Mount (PCB assembly compatibility)
• Number of Elements: Must be 1 (functional equivalence)

The following substitute parts meet these core substitution criteria:

Direct Substitutes (Identical Core Parameters):

• TB3100M-13-F (Diodes Incorporated)
• TISP4350T3BJR-S (Bourns Inc.)

Functional Substitutes (Enhanced Current Ratings):

• TISP4350H3BJR-S (Bourns Inc.)
• P3100SCMCLRP (Littelfuse Inc.)

Functional Substitute (Voltage Variant):

• SMTPA270 (STMicroelectronics)

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Obsolete Part Elimination):

TB3100M-13-F and TISP4350T3BJR-S provide direct functional equivalence with identical core electrical parameters. Both are active products with ROHS3 compliance, eliminating supply chain risk associated with the obsolete TSMBJ0322C. TB3100M-13-F offers higher inventory availability (15,475 pcs) compared to TISP4350T3BJR-S (6,062 pcs).

For Enhanced Performance Applications:

TISP4350H3BJR-S and P3100SCMCLRP provide increased peak pulse current ratings (300A and 400A respectively) while maintaining identical off-state voltage, breakover voltage, and holding current specifications. These parts are suitable for applications requiring higher transient energy absorption. Both are ROHS3 compliant active products.

For Voltage-Variant Applications:

SMTPA270 operates at 270V off-state with 360V breakover voltage, representing a 5V reduction in off-state voltage and 10V increase in breakover voltage. This part maintains identical peak pulse current (150A) and holding current (150mA) specifications. Selection requires circuit-level voltage threshold verification. SMTPA270 is ROHS3 compliant and active.

Compliance Considerations:

All substitute parts are ROHS3 compliant, addressing regulatory requirements not met by the obsolete TSMBJ0322C. TISP4350H3BJR-S and TISP4350T3BJR-S carry REACH Affected status, while all other substitutes are REACH Unaffected.

Frequently Asked Questions (FAQ)

Q: Can TB3100M-13-F directly replace TSMBJ0322C without circuit modification?

A: Yes. TB3100M-13-F maintains identical off-state voltage (275V), breakover voltage (350V), holding current (150mA), and peak pulse current (150A) specifications. The DO-214AA SMB package is mechanically and thermally compatible. No circuit modification is required.

Q: What is the difference between direct substitutes and functional substitutes?

A: Direct substitutes (TB3100M-13-F, TISP4350T3BJR-S) match all core electrical parameters of the TSMBJ0322C. Functional substitutes (TISP4350H3BJR-S, P3100SCMCLRP) provide higher peak pulse current ratings while maintaining voltage and holding current specifications, suitable for applications requiring enhanced transient suppression capability.

Q: Why does SMTPA270 have different voltage specifications?

A: SMTPA270 operates at 270V off-state and 360V breakover voltage, compared to 275V and 350V for TSMBJ0322C. This 5V reduction in off-state voltage and 10V increase in breakover voltage alters circuit protection thresholds. Selection requires verification that the application circuit can operate within these modified voltage parameters.

Q: Are all substitute parts available in the same packaging?

A: Yes. All substitute parts use DO-214AA (SMB) surface mount package with identical mechanical dimensions and thermal characteristics. PCB layout and assembly processes require no modification.

Q: What is the impact of capacitance differences among substitute parts?

A: Capacitance values range from 25pF (SMTPA270) to 62pF (TISP4350H3BJR-S). Higher capacitance may affect high-frequency circuit performance. For applications sensitive to parasitic capacitance, SMTPA270 (25pF) provides the lowest value. For standard transient suppression applications, capacitance differences are not functionally significant.

Q: Which substitute part offers the best long-term supply availability?

A: TISP4350H3BJR-S (Bourns Inc.) offers the highest current inventory (35,200 pcs), followed by TB3100M-13-F (Diodes Incorporated, 15,475 pcs). Both are active products from established manufacturers with established supply chains.