SMAJ220 Equivalent & Substitute Parts

Part Overview

The SMAJ220 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose transient voltage protection in surface-mount applications. This component features a 220V reverse standoff voltage rating and a maximum clamping voltage of 373.8V at peak pulse current. The SMAJ220 is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement continuity.

Substiute Parts

SMAJ220

Littelfuse Inc.In Stock: 839SMAJ220 Datasheet

Current PartRFQ

SMAJ220A

MeritekIn Stock: 21206SMAJ220A Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SMAJ220 is determined by the following critical electrical and mechanical parameters:

• Voltage Rating Match: Reverse standoff voltage of 220V (±tolerance range)
• Clamping Voltage Performance: Maximum clamping voltage within acceptable operational limits
• Peak Pulse Current Capability: Minimum 1.1A peak pulse current rating
• Package Compatibility: DO-214AC (SMA) surface-mount package
• Thermal Operating Range: Support for -55°C to 150°C minimum
• Regulatory Compliance: ROHS3 compliance and EAR99 classification

The SMAJ220A from Meritek meets these substitution criteria while maintaining functional equivalence for general-purpose transient voltage suppression applications.

Parameter Comparison

Engineering Selection Recommendations

The SMAJ220A (Meritek) is a direct functional substitute for the obsolete SMAJ220 (Littelfuse Inc.). Selection is based on the following engineering criteria:

• Electrical Equivalence: Both devices maintain the 220V reverse standoff voltage specification with compatible clamping voltage performance within the 356V to 373.8V range.
• Current Rating: The SMAJ220A provides 1.12A peak pulse current, meeting or exceeding the 1.1A requirement of the original SMAJ220.
• Package Compatibility: Identical DO-214AC (SMA) surface-mount package ensures direct PCB footprint compatibility without layout modifications.
• Regulatory Compliance: Both parts maintain ROHS3 compliance and EAR99 classification, supporting equivalent supply chain and environmental requirements.
• Product Status: The SMAJ220A is active in production, ensuring long-term availability and procurement stability compared to the obsolete SMAJ220.
• Thermal Performance: The SMAJ220A supports -55°C to 150°C operation, covering the critical upper temperature range of the original specification.

Frequently Asked Questions (FAQ)

Q: Can the SMAJ220A be used as a direct replacement for the SMAJ220 without circuit modifications?

A: Yes. The SMAJ220A maintains electrical equivalence in reverse standoff voltage (220V), peak pulse current (1.12A vs. 1.1A), and power dissipation (400W). The identical DO-214AC (SMA) package ensures direct PCB compatibility without layout changes.

Q: What is the difference in clamping voltage between the SMAJ220 and SMAJ220A?

A: The SMAJ220 has a maximum clamping voltage of 373.8V, while the SMAJ220A is rated at 356V. The SMAJ220A provides lower clamping voltage, which is acceptable for transient suppression applications and may offer improved protection margins in some circuit configurations.

Q: Are there any temperature range limitations when substituting the SMAJ220A?

A: The SMAJ220A operates from -55°C to 150°C, compared to the SMAJ220's -65°C to 150°C range. For applications requiring operation below -55°C, the SMAJ220A may not be suitable. For standard industrial and commercial temperature ranges, the SMAJ220A is fully compatible.

Q: Does the SMAJ220A meet the same regulatory and compliance standards?

A: Yes. Both the SMAJ220 and SMAJ220A are ROHS3 compliant, classified as EAR99, and carry identical HTSUS codes (8541.10.0080), ensuring equivalent regulatory and supply chain status.

Q: What is the packaging difference between the SMAJ220 and SMAJ220A?

A: The SMAJ220A is supplied in Tape & Reel (TR) packaging, while the original SMAJ220 packaging is not specified. Both use the identical DO-214AC (SMA) component package, ensuring mechanical and electrical compatibility on PCBs.

Q: Is the SMAJ220A suitable for power line protection applications?

A: The SMAJ220A is classified for general-purpose transient voltage suppression. Power line protection applications require specific certification and design validation beyond the scope of this substitution analysis.