SMA6L22A Equivalent & Substitute Parts

Part Overview

The SMA6L22A is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Littelfuse Inc., designed for general-purpose overvoltage protection applications. This surface-mount component operates across a temperature range of -65°C to 150°C and is RoHS3 compliant. The part is currently in active production status with 946 units available in inventory. Equivalent and substitute parts are identified based on matching electrical characteristics and mechanical compatibility within the DO-221AC package family.

Substiute Parts

SMA6L22A

Littelfuse Inc.In Stock: 1015SMA6L22A Datasheet

Current PartRFQ

TPSMA6L22A

Littelfuse Inc.In Stock: 3993TPSMA6L22A Datasheet

DirectRFQ

SM4T26AY

STMicroelectronicsIn Stock: 10776SM4T26AY Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMA6L22A are identified based on the following critical electrical and mechanical parameters:

• Voltage - Reverse Standoff (Typ): 22V
• Voltage - Breakdown (Min): 24.4V
• Unidirectional channel configuration (1 channel)
• Surface-mount package compatibility
• RoHS3 compliance

Two substitute parts meet these criteria with varying performance characteristics and certifications. The substitution logic accounts for differences in clamping voltage, peak pulse current ratings, and operating temperature ranges, which determine suitability for specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

TPSMA6L22A (Littelfuse Inc.) provides direct electrical equivalence to the SMA6L22A with identical clamping voltage (35.5V) and peak pulse current (16.9A). This part carries automotive-grade qualification (AEC-Q101) and maintains the same package footprint. The operating temperature range is reduced to -50°C ~ 150°C compared to the original -65°C ~ 150°C specification. This substitute is suitable for applications where automotive-grade certification is required or preferred.

SM4T26AY (STMicroelectronics) maintains the same reverse standoff voltage (22V) and breakdown voltage (24.4V) but exhibits higher clamping voltage (48.3V) and significantly higher peak pulse current capability (48A at 8/20µs pulse). This part is also automotive-grade qualified (AEC-Q101) and operates across -55°C ~ 150°C. The SM4T26AY is suitable for applications requiring enhanced transient suppression performance and higher current handling capacity, though the increased clamping voltage must be verified against circuit design constraints.

Frequently Asked Questions (FAQ)

Q: Can TPSMA6L22A be used as a direct replacement for SMA6L22A?

A: Yes. TPSMA6L22A provides electrical equivalence with identical voltage ratings (22V standoff, 24.4V breakdown, 35.5V clamping) and current specifications (16.9A peak pulse). Both use the DO-221AC package. The primary difference is the automotive-grade qualification of TPSMA6L22A and a reduced minimum operating temperature of -50°C versus -65°C for the original part.

Q: What are the key differences between SM4T26AY and the original SMA6L22A?

A: SM4T26AY maintains identical reverse standoff (22V) and breakdown voltages (24.4V) but differs in clamping voltage (48.3V versus 35.5V) and peak pulse current (48A versus 16.9A). The package is DO-214AC (SMA) rather than DO-221AC. These differences indicate higher transient suppression capability but require verification that the increased clamping voltage is acceptable for the target application.

Q: Are all three parts RoHS3 compliant?

A: Yes. SMA6L22A, TPSMA6L22A, and SM4T26AY are all RoHS3 compliant with Moisture Sensitivity Level 1 (Unlimited).

Q: Which substitute should be selected for automotive applications?

A: Both TPSMA6L22A and SM4T26AY carry AEC-Q101 automotive qualification. TPSMA6L22A provides direct electrical equivalence, while SM4T26AY offers enhanced performance characteristics. Selection depends on specific circuit requirements and whether the higher clamping voltage of SM4T26AY is compatible with the design.

Q: Are there package compatibility considerations?

A: SMA6L22A and TPSMA6L22A both use DO-221AC packages with identical footprints. SM4T26AY uses DO-214AC (SMA) package, which has a different footprint and requires PCB layout verification before substitution.