ALS5W28A Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The ALS5W28A is an automotive-grade Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated. This unidirectional zener-type device is designed for surface mount applications in the DO-218AB package. The part is currently active in production with 708 units in stock. TVS diodes are essential components for protecting sensitive electronic circuits from transient voltage spikes and electrostatic discharge events. Equivalent and substitute parts are identified when original inventory is unavailable or when design requirements permit alternative specifications within acceptable electrical and mechanical parameters.

Substiute Parts

ALS5W28A

Diodes IncorporatedIn Stock: 774ALS5W28A Datasheet

Current PartRFQ

SM6A27HE3/2D

Vishay General Semiconductor - Diodes DivisionIn Stock: 23614SM6A27HE3/2D Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the ALS5W28A are identified based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Electrical Compatibility Criteria:

• Unidirectional zener TVS diode type with single channel configuration
• Reverse standoff voltage within the operational range of the original circuit design
• Clamping voltage performance suitable for transient suppression
• Peak pulse current rating adequate for the application
• Operating temperature range encompassing -55°C to 175°C
• Automotive-grade classification with AEC-Q101 qualification

Mechanical Compatibility Criteria:

• Surface mount package format (DO-218AB)
• Identical or compatible pinout configuration
• RoHS3 compliance and REACH unaffected status

The SM6A27HE3/2D manufactured by Vishay General Semiconductor qualifies as a substitute part. While this device operates at a lower reverse standoff voltage (22V versus 28V) and lower clamping voltage (40V versus 45.4V), it maintains automotive-grade certification, AEC-Q101 qualification, identical package format, and compatible operating temperature specifications. The lower voltage ratings indicate this substitute is suitable for applications with reduced voltage stress requirements or as a protective measure in lower-voltage circuit sections.

Parameter Comparison

Engineering Selection Recommendations

Both the ALS5W28A and SM6A27HE3/2D maintain active product status with full automotive-grade certification and AEC-Q101 qualification. Both devices are RoHS3 compliant and REACH unaffected, meeting current regulatory requirements for automotive and industrial applications.

The selection between these parts depends on circuit voltage specifications. The ALS5W28A operates at higher voltage thresholds (28V reverse standoff, 45.4V clamping) and delivers higher peak pulse current (79A). The SM6A27HE3/2D operates at lower voltage thresholds (22V reverse standoff, 40V clamping) with lower peak pulse current (65A) but higher peak pulse power rating (4600W versus 3600W).

Both devices share identical operating temperature ranges (-55°C to 175°C), identical package format (DO-218AB), and identical mounting type (surface mount). The mechanical and thermal compatibility is complete between these parts.

Frequently Asked Questions (FAQ)

Q: Can the SM6A27HE3/2D replace the ALS5W28A in all applications?

A: No. The SM6A27HE3/2D operates at lower voltage thresholds. It is suitable only for circuits designed for 22V reverse standoff voltage or lower. Direct substitution in circuits requiring 28V standoff voltage will result in premature device activation and circuit malfunction.

Q: What is the difference between the pulse current specifications (10/1000µs versus 8/20µs)?

A: These represent different pulse waveform standards. The ALS5W28A is rated for 79A using the 10/1000µs waveform, while the SM6A27HE3/2D is rated for 65A using the 8/20µs waveform. These are distinct measurement standards and direct current comparison requires waveform normalization.

Q: Are both parts suitable for automotive applications?

A: Yes. Both the ALS5W28A and SM6A27HE3/2D carry automotive-grade classification and AEC-Q101 qualification, meeting automotive industry standards for reliability and performance.

Q: Is the package format identical between these parts?

A: Yes. Both parts use the DO-218AB surface mount package with identical pinout and mechanical dimensions, allowing direct PCB footprint compatibility.

Q: What is the inventory status for each part?

A: The ALS5W28A has 708 units in stock. The SM6A27HE3/2D has 23,600 units in stock. Availability should be confirmed with the supplier for current project requirements.

Q: Do both parts meet current environmental compliance standards?

A: Yes. Both the ALS5W28A and SM6A27HE3/2D are RoHS3 compliant and REACH unaffected, meeting current environmental regulations for electronic components.