SA33A-TP Equivalent & Substitute Parts

Part Overview

The SA33A-TP is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Micro Commercial Co, designed for general-purpose transient voltage protection in through-hole applications. The device features a 33V reverse standoff voltage with a 53.3V maximum clamping voltage and 9.6A peak pulse current capability. Currently in active product status with 3405 units in stock, the SA33A-TP is packaged in DO-15 (DO-204AC) axial configuration and is ROHS3 compliant. Equivalent and substitute parts are identified based on matching electrical characteristics within acceptable tolerance ranges for reverse standoff voltage, clamping voltage, peak pulse current, and power dissipation, while maintaining compatibility with through-hole DO-15 mounting requirements.

Substiute Parts

SA33A-TP

Micro Commercial CoIn Stock: 3421SA33A-TP Datasheet

Current PartRFQ

SA33A

Fairchild SemiconductorIn Stock: 21325SA33A Datasheet

DirectRFQ

P6KE39A

Taiwan Semiconductor CorporationIn Stock: 18061P6KE39A Datasheet

SimilarRFQ

SLD33U-017

LittelfuseIn Stock: 1564SLD33U-017 Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SA33A-TP are classified based on electrical parameter compatibility within the following criteria:

Primary Substitution Criteria:

• Reverse standoff voltage within ±1.5% of 33V (range: 32.5V to 34.6V)
• Clamping voltage within ±2% of 53.3V (range: 52.2V to 54.4V)
• Peak pulse current capability ≥9.6A
• Power dissipation ≥500W
• Through-hole axial mounting (DO-15 or equivalent package)
• ROHS3 compliance

Direct Equivalent: SA33A (Fairchild Semiconductor) maintains identical electrical specifications with 9.4A peak pulse current, representing a direct functional equivalent despite obsolete product status.

Similar Substitutes: P6KE39A (Taiwan Semiconductor Corporation) and SLD33U-017 (Littelfuse) meet or exceed all electrical parameters with enhanced performance characteristics. P6KE39A provides 11.2A peak pulse current and 600W power dissipation. SLD33U-017 offers significantly higher performance with 95.7A peak pulse current and 5kW power dissipation, suitable for higher-stress applications, and includes automotive-grade qualification (AEC-Q101).

Parameter Comparison

Engineering Selection Recommendations

SA33A (Fairchild Semiconductor): Direct electrical equivalent with identical 33V standoff and 53.3V clamping specifications. Suitable for direct replacement in existing designs. Note: Product status is obsolete; long-term availability may be limited. Recommended only when existing inventory is available or when design continuity with legacy systems is required.

P6KE39A (Taiwan Semiconductor Corporation): Active product with enhanced performance specifications. Provides 11.2A peak pulse current (16.7% higher than SA33A-TP) and 600W power dissipation (20% higher). Reverse standoff voltage of 33.3V and clamping voltage of 53.9V remain within acceptable substitution tolerance. Maintains DO-15 through-hole packaging and ROHS3 compliance. Recommended for new designs and applications requiring improved transient protection margin.

SLD33U-017 (Littelfuse): Active product with automotive-grade qualification (AEC-Q101) and significantly enhanced performance. Delivers 95.7A peak pulse current and 5kW power dissipation, suitable for high-stress industrial and automotive applications. Electrical parameters (33V standoff, 53.3V clamping) match SA33A-TP specifications. Package configuration is P600 (axial through-hole), compatible with standard DO-15 footprints. Recommended for applications requiring higher transient energy absorption or automotive-grade reliability.

Frequently Asked Questions (FAQ)

Q: Can SA33A-TP be directly replaced with SA33A from Fairchild Semiconductor?

A: Yes. SA33A provides identical electrical specifications with 33V reverse standoff voltage, 53.3V clamping voltage, and 500W power dissipation. The 9.4A peak pulse current is within 2% of the SA33A-TP specification. Both devices use DO-15 through-hole packaging. However, SA33A is obsolete; substitution is practical only when existing inventory is available.

Q: What is the difference between P6KE39A and SA33A-TP?

A: P6KE39A provides enhanced performance with 11.2A peak pulse current (versus 9.6A) and 600W power dissipation (versus 500W). Reverse standoff voltage is 33.3V (0.9% higher than 33V) and clamping voltage is 53.9V (1.1% higher than 53.3V). Both parameters remain within acceptable substitution tolerance. P6KE39A is an active product with better long-term availability.

Q: Is SLD33U-017 compatible with SA33A-TP applications?

A: SLD33U-017 is electrically compatible with identical 33V standoff and 53.3V clamping specifications. However, the package is P600 (larger axial through-hole format) rather than DO-15. PCB layout modifications may be required. SLD33U-017 offers significantly higher performance (95.7A peak pulse, 5kW power) and automotive-grade qualification, making it suitable for demanding applications where enhanced transient protection is beneficial.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SA33A, P6KE39A, and SLD33U-017 are all ROHS3 compliant, matching the compliance status of SA33A-TP.

Q: Which substitute part should be selected for new product designs?

A: P6KE39A is recommended for standard applications requiring active product status and improved performance margin. SLD33U-017 is recommended for automotive or high-stress industrial applications requiring AEC-Q101 qualification and enhanced transient energy absorption capability. Both are ROHS3 compliant and available in production quantities.