SMAJ33A Transient Voltage Suppressor Equivalent & Substitute Parts

Part Overview

The SMAJ33A is an active Transient Voltage Suppressor (TVS) diode manufactured by Taiwan Semiconductor Corporation. This unidirectional zener-type device is designed for general-purpose transient voltage suppression applications in surface-mount configurations. The component operates across a temperature range of -55°C to 150°C and is housed in a DO-214AC (SMA) package. Identification of equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and maintain component availability across manufacturing cycles.

Substiute Parts

SMAJ33A

Taiwan Semiconductor CorporationIn Stock: 65138SMAJ33A Datasheet

Current PartRFQ

SMAJ33A

MDDIn Stock: 65153SMAJ33A Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SMAJ33A are identified based on electrical and mechanical parameter equivalence. The critical parameters that determine substitution compatibility are:

• Voltage - Reverse Standoff (Typ): 33V
• Voltage - Breakdown (Min): 36.7V
• Voltage - Clamping (Max) @ Ipp: 53.3V
• Current - Peak Pulse (10/1000µs): 7.5A
• Power - Peak Pulse: 400W
• Package / Case: DO-214AC, SMA
• Mounting Type: Surface Mount
• Type: Zener
• Unidirectional Channels: 1

Parts meeting these electrical specifications and mechanical requirements are classified as direct substitutes. Operating temperature range variations within the specified limits do not preclude substitution eligibility when all other parameters align.

Parameter Comparison

Engineering Selection Recommendations

The SMAJ33A manufactured by MDD is a direct electrical and mechanical equivalent to the Taiwan Semiconductor Corporation SMAJ33A. Both devices meet identical specifications for voltage suppression, peak pulse current, and power dissipation. Both components are ROHS3 compliant, carry MSL Level 1 (Unlimited) moisture sensitivity ratings, and share the same ECCN and HTSUS classifications.

The operating temperature range of the MDD variant extends from -50°C to 150°C, compared to -55°C to 150°C for the Taiwan Semiconductor version. This represents a 5°C reduction in the lower temperature limit. Selection between these parts depends on application-specific temperature requirements. For applications operating above -50°C, both devices are functionally interchangeable.

Both parts are classified as Active products, indicating current manufacturing and availability status. Selection may be based on supply chain considerations, lead time, inventory availability, or cost factors without compromising electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can the MDD SMAJ33A replace the Taiwan Semiconductor SMAJ33A in all applications?

A: The MDD SMAJ33A is electrically and mechanically equivalent for applications operating at temperatures above -50°C. Applications requiring operation below -50°C require the Taiwan Semiconductor version, which is rated to -55°C.

Q: Are the package dimensions identical between these two parts?

A: Both parts use the DO-214AC (SMA) package and are surface-mount devices. Package and case specifications are identical.

Q: What is the significance of the identical part number across different manufacturers?

A: Both manufacturers use the designation SMAJ33A, indicating they produce devices meeting the same electrical and mechanical specifications. This is a standard industry practice for cross-manufacturer compatibility.

Q: Are there any compliance or certification differences between these parts?

A: Both parts carry identical RoHS3 compliance status, MSL Level 1 ratings, ECCN classifications (EAR99), and HTSUS codes (8541.10.0080). No compliance or certification differences exist.

Q: What parameters must remain constant for substitution eligibility?

A: Voltage ratings (reverse standoff, breakdown, and clamping), peak pulse current, power dissipation, package type, mounting configuration, and device type must remain constant. Operating temperature range may vary within application requirements.

Q: Is the MDD part suitable for high-temperature applications?

A: The MDD SMAJ33A is rated to 150°C maximum junction temperature, identical to the Taiwan Semiconductor version. Both parts are suitable for high-temperature applications within this limit.