1.5SMC550C Equivalent & Substitute Parts

Part Overview

The 1.5SMC550C is a bidirectional transient voltage suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection in surface-mount applications. This component features a 495V reverse standoff voltage, 798V maximum clamping voltage, and 1500W peak pulse power rating in a DO-214AB (SMC) package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

1.5SMC550C

Littelfuse Inc.In Stock: 9491.5SMC550C Datasheet

Current PartRFQ

1.5SMC550CA

Littelfuse Inc.In Stock: 572671.5SMC550CA Datasheet

MFR RecommendedRFQ

1.5SMC550CA

Littelfuse Inc.In Stock: 572671.5SMC550CA Datasheet

MFR RecommendedRFQ

SMCJ1.5KE550CA-TP

Micro Commercial CoIn Stock: 806SMCJ1.5KE550CA-TP Datasheet

MFR RecommendedRFQ

SMCJ495CA

Bourns Inc.In Stock: 870SMCJ495CA Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 1.5SMC550C is determined by strict equivalence across the following critical parameters:

• Voltage - Reverse Standoff (Typ): 495V
• Voltage - Clamping (Max) @ Ipp: 760V or lower (acceptable for protection margin)
• Current - Peak Pulse (10/1000µs): 2A
• Power - Peak Pulse: 1500W (1.5kW)
• Bidirectional Channels: 1
• Mounting Type: Surface Mount
• Package / Case: DO-214AB (SMC or SMCJ variant)
• Type: Zener
• Applications: General Purpose

All substitute parts listed maintain these electrical and mechanical specifications within acceptable tolerances for direct replacement in the same circuit application.

Parameter Comparison

Engineering Selection Recommendations

1.5SMC550CA (Littelfuse Inc.) is the primary recommended substitute. This part is manufactured by the original equipment supplier, maintains identical electrical specifications, carries Active product status, and is available in high inventory (57,202 pcs). ROHS3 compliance and MSL 1 rating ensure compatibility with modern manufacturing processes.

SMCJ1.5KE550CA-TP (Micro Commercial Co) provides an alternative from an established TVS manufacturer. This part offers an extended operating temperature range (-55°C ~ 175°C) compared to the main part, providing additional thermal margin in high-temperature applications. ROHS3 and REACH compliance are confirmed. Inventory availability is lower (770 pcs).

SMCJ495CA (Bourns Inc.) is a functionally equivalent option from a recognized component manufacturer. This part maintains all critical electrical parameters and is available in moderate inventory (810 pcs). ROHS3 compliance is confirmed; however, REACH Status is listed as Affected, requiring verification for applications subject to REACH regulations.

All three substitutes are electrically and mechanically compatible with the 1.5SMC550C in general-purpose TVS applications. Selection should prioritize availability, supply chain stability, and regulatory compliance requirements for the target application.

Frequently Asked Questions (FAQ)

Q: Can the 1.5SMC550CA directly replace the 1.5SMC550C without circuit modification?

A: Yes. The 1.5SMC550CA maintains identical reverse standoff voltage (495V), peak pulse current (2A), and power rating (1500W). The clamping voltage is 760V versus 798V on the original part, which provides adequate protection margin in general-purpose applications. No circuit changes are required.

Q: What is the difference between DO-214AB, SMC, and SMCJ package designations?

A: DO-214AB is the standardized package outline. SMC and SMCJ are supplier-specific designations for the same physical package. All parts listed use the DO-214AB form factor and are mechanically interchangeable on the PCB.

Q: Why does the SMCJ1.5KE550CA-TP have a higher operating temperature range?

A: The SMCJ1.5KE550CA-TP is rated to -55°C ~ 175°C (TJ) versus -55°C ~ 150°C for other substitutes. This extended range reflects the manufacturer's thermal design and qualification. For applications operating within -55°C ~ 150°C, all parts perform equivalently.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All three substitute parts carry ROHS3 Compliant status, meeting current environmental and hazardous substance restrictions.

Q: What is the significance of REACH Status in the SMCJ495CA listing?

A: REACH Status "Affected" indicates the part may contain substances subject to REACH regulations. Applications requiring REACH compliance should prioritize the 1.5SMC550CA or SMCJ1.5KE550CA-TP, both listed as REACH Unaffected.

Q: Can I use these substitutes in new production designs?

A: Yes. All substitute parts carry Active product status, ensuring long-term availability and manufacturing support. The 1.5SMC550CA is recommended for new designs due to highest inventory levels and original manufacturer sourcing.