TPSMA39HE3/5AT Equivalent & Substitute Parts

Part Overview

The TPSMA39HE3/5AT is a unidirectional transient voltage suppressor (TVS) diode manufactured by Vishay General Semiconductor - Diodes Division. This component is designed for surface mount applications in the DO-214AC (SMA) package and provides transient overvoltage protection with a 31.6V reverse standoff voltage and 56.4V clamping voltage. The part is currently classified as obsolete, making identification of equivalent and substitute components essential for ongoing design support and production continuity.

Substiute Parts

TPSMA39HE3/5AT

Vishay General Semiconductor - Diodes DivisionIn Stock: 1027TPSMA39HE3/5AT Datasheet

Current PartRFQ

P4SMA39

Taiwan Semiconductor CorporationIn Stock: 1148P4SMA39 Datasheet

MFR RecommendedRFQ

PTVS33VS1UR,115

Nexperia USA Inc.In Stock: 18980PTVS33VS1UR,115 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of TVS diodes is determined by electrical compatibility across critical parameters: reverse standoff voltage, breakdown voltage, clamping voltage, peak pulse current, and power dissipation capability. The TPSMA39HE3/5AT operates with a 31.6V standoff and 56.4V clamping specification. Substitute parts must maintain equivalent voltage protection characteristics within the same functional range to ensure circuit protection integrity.

Two substitute parts are identified based on matching electrical performance:

P4SMA39 (Taiwan Semiconductor Corporation) - Maintains identical standoff voltage (31.6V), breakdown voltage (35.1V), and clamping voltage (56.4V) with comparable peak pulse current (7.4A) and 400W power rating. Package compatibility is maintained in DO-214AC (SMA).

PTVS33VS1UR,115 (Nexperia USA Inc.) - Operates at a slightly elevated standoff voltage (33V) with reduced clamping voltage (53.3V) and comparable peak pulse current (7.5A). This part uses SOD-123W packaging, requiring mechanical redesign consideration.

Parameter Comparison

Engineering Selection Recommendations

P4SMA39 is the primary substitute for direct replacement of TPSMA39HE3/5AT. This part maintains identical electrical specifications across all critical voltage and current parameters while preserving the DO-214AC (SMA) package footprint. The part is currently in active production status with ROHS3 compliance. No PCB layout modifications are required for this substitution.

PTVS33VS1UR,115 serves as an alternative substitute when P4SMA39 availability is constrained. This Nexperia part maintains AEC-Q101 automotive qualification and ROHS3 compliance. However, the SOD-123W package requires PCB redesign and footprint modification. The elevated standoff voltage (33V vs. 31.6V) and reduced clamping voltage (53.3V vs. 56.4V) represent acceptable operational variance for applications where circuit protection thresholds permit this voltage shift.

Frequently Asked Questions (FAQ)

Q: Can P4SMA39 be used as a direct drop-in replacement for TPSMA39HE3/5AT?

A: Yes. P4SMA39 maintains identical reverse standoff voltage (31.6V), breakdown voltage (35.1V), and clamping voltage (56.4V) specifications. The DO-214AC (SMA) package is identical, requiring no PCB modifications. Peak pulse current is marginally higher (7.4A vs. 7.1A), which is operationally compatible.

Q: What are the key differences between P4SMA39 and PTVS33VS1UR,115?

A: The primary differences are package type and voltage specifications. P4SMA39 uses DO-214AC (SMA) packaging identical to the original part, while PTVS33VS1UR,115 uses SOD-123W, requiring PCB redesign. PTVS33VS1UR,115 operates at 33V standoff with 53.3V clamping, compared to 31.6V standoff and 56.4V clamping for P4SMA39. Both maintain 400W power dissipation and comparable peak pulse current ratings.

Q: Does PTVS33VS1UR,115 require circuit validation before use?

A: PTVS33VS1UR,115 introduces voltage specification changes (higher standoff, lower clamping) that may affect circuit protection margins. Circuit analysis is necessary to confirm that the altered voltage thresholds remain compatible with protected circuit requirements. Additionally, PCB layout modification is mandatory due to package change from DO-214AC to SOD-123W.

Q: Are both substitute parts automotive qualified?

A: P4SMA39 does not carry explicit automotive grade or AEC-Q101 qualification in the provided specifications. PTVS33VS1UR,115 maintains automotive grade classification and AEC-Q101 qualification, matching the original TPSMA39HE3/5AT. For automotive applications requiring AEC-Q101 compliance, PTVS33VS1UR,115 is the qualified alternative.

Q: What is the operating temperature range difference between the original and substitutes?

A: TPSMA39HE3/5AT operates from -65°C to 185°C (junction temperature). Both P4SMA39 and PTVS33VS1UR,115 operate from -55°C to 150°C, representing a narrower temperature range. Applications requiring operation below -55°C or above 150°C cannot use these substitutes.