SMAJ300CA-TP Equivalent & Substitute Parts

Part Overview

The SMAJ300CA-TP is a Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose transient voltage protection in surface-mount applications. This component features a 300V reverse standoff voltage with a 486V maximum clamping voltage and 800mA peak pulse current capability. The part is actively produced and widely stocked, with 5906 units available in inventory. Finding equivalent and substitute parts is necessary to ensure supply chain flexibility, optimize procurement costs, and maintain design continuity across manufacturing batches and supplier availability.

Substiute Parts

SMAJ300CA-TP

Micro Commercial CoIn Stock: 5979SMAJ300CA-TP Datasheet

Current PartRFQ

SMAJ300CA

MeritekIn Stock: 5114SMAJ300CA Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SMAJ300CA-TP is determined by strict alignment of the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 300V
• Voltage - Breakdown (Min): 335V
• Voltage - Clamping (Max) @ Ipp: 486V
• Package / Case: DO-214AC (SMA)
• Mounting Type: Surface Mount
• Type: Zener
• Bidirectional Channels: 1

The substitute part SMAJ300CA (Meritek) meets all primary electrical specifications and package requirements. Minor variations in peak pulse current (820mA vs. 800mA) and operating temperature maximum (-55 to 150°C vs. -55 to 175°C) represent acceptable tolerances within the TVS diode category, as the substitute maintains the same voltage protection envelope and mechanical form factor.

Parameter Comparison

Engineering Selection Recommendations

Both the SMAJ300CA-TP (Micro Commercial Co) and SMAJ300CA (Meritek) are active products with full regulatory compliance. The Micro Commercial Co variant maintains a wider operating temperature range (-55 to 175°C) compared to the Meritek substitute (-55 to 150°C). For applications operating at elevated temperatures approaching or exceeding 150°C, the original SMAJ300CA-TP is the appropriate selection. For general-purpose applications within the -55 to 150°C range, the Meritek SMAJ300CA substitute provides equivalent protection with a marginally higher peak pulse current rating (820mA vs. 800mA), offering additional design margin. Both parts carry identical RoHS3 and REACH compliance certifications, ensuring regulatory alignment across supply sources.

Frequently Asked Questions (FAQ)

Q: Can SMAJ300CA (Meritek) be used as a direct replacement for SMAJ300CA-TP (Micro Commercial Co)?

A: Yes, for applications operating within -55 to 150°C. The electrical protection characteristics (300V standoff, 486V clamping, 400W peak power) are identical. If your application requires operation above 150°C, the original SMAJ300CA-TP is required.

Q: What is the significance of the 20mA difference in peak pulse current (800mA vs. 820mA)?

A: The Meritek substitute has a higher peak pulse current rating, which provides additional design margin without compromising the primary voltage protection function. This difference does not affect substitutability.

Q: Are both parts pin-compatible?

A: Yes. Both parts use the DO-214AC (SMA) surface-mount package with identical pinout and footprint requirements.

Q: Do both parts meet the same regulatory standards?

A: Yes. Both SMAJ300CA-TP and SMAJ300CA are ROHS3 compliant and REACH unaffected, ensuring equivalent regulatory status.

Q: Which part should I select for a new design?

A: For new designs without specific high-temperature requirements, either part is acceptable. For designs requiring operation above 150°C, specify SMAJ300CA-TP. For cost optimization within standard temperature ranges, SMAJ300CA is suitable.