SMAJ250A-TP Equivalent & Substitute Parts

Part Overview

The SMAJ250A-TP is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose overvoltage protection applications. This surface-mount component operates with a reverse standoff voltage of 250V and provides clamping at 405V maximum, making it suitable for protecting sensitive electronic circuits from transient voltage events. The part is currently in active production status with full RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1). Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained within the specified parameter tolerances.

Substiute Parts

SMAJ250A-TP

Micro Commercial CoIn Stock: 1047SMAJ250A-TP Datasheet

Current PartRFQ

SMAJ250A

MeritekIn Stock: 5445SMAJ250A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ250A-TP are qualified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 250V
• Voltage - Breakdown (Min): 279V
• Voltage - Clamping (Max) @ Ipp: 405V
• Package / Case: DO-214AC (SMA)
• Type: Zener, Unidirectional
• RoHS3 Compliance and MSL 1 rating

The SMAJ250A from Meritek meets these core substitution criteria. While the peak pulse current specification differs slightly (990mA versus 1A), this variance remains within acceptable tolerance for general-purpose TVS applications where the clamping voltage and standoff voltage characteristics are the primary functional determinants. Both parts maintain identical voltage protection thresholds and package compatibility.

Parameter Comparison

Engineering Selection Recommendations

Both the SMAJ250A-TP and SMAJ250A are active-status components with full RoHS3 compliance and REACH unaffected status. Selection between these parts should be based on the following factors:

The SMAJ250A-TP from Micro Commercial Co maintains a maximum operating temperature of 175°C, providing extended thermal performance margin for applications operating in elevated ambient conditions. The SMAJ250A from Meritek operates to 150°C maximum, which is suitable for standard industrial and consumer applications within this temperature range.

Both parts are certified for unlimited moisture sensitivity (MSL 1), eliminating moisture-related handling constraints. The peak pulse current specification of 990mA (Meritek) versus 1A (Micro Commercial Co) represents a 1% variance that does not affect functional equivalence for general-purpose transient suppression where clamping voltage performance is the primary design criterion.

Frequently Asked Questions (FAQ)

Q: Can SMAJ250A (Meritek) be used as a direct replacement for SMAJ250A-TP (Micro Commercial Co)?

A: Yes, for applications operating within the 150°C maximum temperature limit. Both parts provide identical voltage protection characteristics (250V standoff, 405V clamping) and are packaged in DO-214AC (SMA). The 1% difference in peak pulse current specification does not affect substitution validity for general-purpose TVS applications.

Q: What is the significance of the operating temperature difference between these parts?

A: The SMAJ250A-TP supports operation to 175°C, while the SMAJ250A supports 150°C. Applications requiring sustained operation above 150°C must use the SMAJ250A-TP. For applications with maximum ambient temperatures at or below 150°C, both parts are functionally equivalent.

Q: Are both parts suitable for the same PCB assembly processes?

A: Yes. Both parts use identical DO-214AC (SMA) surface-mount packaging and carry MSL 1 (unlimited) moisture sensitivity ratings, requiring no special handling or storage precautions. Standard reflow soldering processes apply to both components.

Q: What compliance certifications apply to both substitute parts?

A: Both the SMAJ250A-TP and SMAJ250A are RoHS3 compliant and REACH unaffected. Both carry ECCN classification EAR99 and HTSUS code 8541.10.0080.

Q: How do the voltage specifications compare between these parts?

A: Both parts are identical in voltage performance: 250V reverse standoff voltage (typical), 279V minimum breakdown voltage, and 405V maximum clamping voltage at peak pulse current. These matching specifications ensure equivalent transient suppression performance.