TPAR3G Equivalent & Substitute Parts

Part Overview

The TPAR3G is a fast recovery avalanche diode manufactured by Taiwan Semiconductor Corporation, rated for 400V DC reverse voltage and 3A average rectified current. This surface mount component features a 120ns reverse recovery time and is housed in a TO-277A (SMPC) package. The TPAR3G is designated as Last Time Buy, indicating discontinued production status. Identification of equivalent and substitute parts is necessary to ensure design continuity and procurement availability for applications requiring compatible rectification performance.

Substiute Parts

TPAR3G

Taiwan Semiconductor CorporationIn Stock: 844TPAR3G Datasheet

Current PartRFQ

TPAR3J S1G

Taiwan Semiconductor CorporationIn Stock: 1037TPAR3J S1G Datasheet

DirectRFQ

TUAR4GH

Taiwan Semiconductor CorporationIn Stock: 7128TUAR4GH Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the TPAR3G is determined by compatibility across the following critical parameters: DC reverse voltage rating, average rectified current capacity, package type, mounting configuration, and compliance certifications. Substitute parts must maintain electrical performance within the application's design envelope while preserving mechanical and thermal characteristics.

The TPAR3G has two identified substitutes:

TPAR3J S1G — Direct functional equivalent with elevated voltage rating (600V vs. 400V). Maintains identical current capacity (3A), forward voltage (1.55V @ 3A), reverse recovery time (120ns), and TO-277A package configuration. Differs in packaging format (Cut Tape vs. Tape & Reel) and product status (Active vs. Last Time Buy).

TUAR4GH — Elevated current capacity substitute (4A vs. 3A) with matched voltage rating (400V). Exhibits improved reverse leakage characteristics (5µA vs. 10µA @ rated voltage) and lower forward voltage (1.4V @ 4A). Includes automotive qualification (AEC-Q101) and differs in reverse recovery time (150ns vs. 120ns) and package designation (SMPC4.6U).

Parameter Comparison

Engineering Selection Recommendations

TPAR3J S1G is the primary substitute for TPAR3G applications. Both components share identical electrical performance specifications (3A current, 120ns recovery time, 1.55V forward voltage) and thermal operating range (-55°C to 175°C). The TPAR3J S1G provides enhanced voltage margin with a 600V rating compared to the TPAR3G's 400V specification, enabling use in higher voltage applications while maintaining backward compatibility in 400V designs. Both parts are ROHS3 compliant and REACH unaffected. The TPAR3J S1G is in Active product status, ensuring long-term availability. Packaging differs only in format (Cut Tape vs. Tape & Reel), which does not affect electrical or mechanical compatibility.

TUAR4GH is a secondary substitute suitable for applications where increased current capacity is acceptable. This part maintains the 400V voltage rating and fast recovery speed classification but provides 4A current capacity versus the TPAR3G's 3A rating. The TUAR4GH exhibits superior reverse leakage performance (5µA vs. 10µA) and lower forward voltage drop (1.4V @ 4A). The TUAR4GH includes automotive qualification (AEC-Q101) and is in Active product status. The maximum junction temperature is 150°C versus 175°C for TPAR3G, and reverse recovery time is 150ns versus 120ns. These differences require evaluation against specific application thermal and switching frequency requirements.

Both substitutes maintain TO-277 package compatibility and surface mount configuration. All three parts are ROHS3 compliant with MSL 1 (Unlimited) moisture sensitivity rating.

Frequently Asked Questions (FAQ)

Q: Can TPAR3J S1G be used as a direct replacement for TPAR3G in all applications?

A: Yes, for applications operating at or below 400V. The TPAR3J S1G maintains identical current (3A), forward voltage (1.55V @ 3A), and reverse recovery time (120ns) specifications. The elevated 600V rating provides additional voltage margin without degrading performance in lower voltage circuits. Both components share the same TO-277A package and thermal operating range (-55°C to 175°C).

Q: What are the limitations of using TUAR4GH as a substitute?

A: TUAR4GH differs in three key parameters: reverse recovery time (150ns vs. 120ns), maximum junction temperature (150°C vs. 175°C), and technology classification (Standard vs. Avalanche). Applications with strict switching frequency requirements or operating near 175°C may require evaluation. The 4A current rating exceeds TPAR3G requirements and does not present a limitation for 3A designs.

Q: Are there packaging compatibility concerns between the three parts?

A: All three parts use TO-277 package classification and surface mount configuration. TPAR3G and TPAR3J S1G both specify TO-277A (SMPC) supplier device package. TUAR4GH specifies SMPC4.6U supplier device package. These designations represent manufacturer-specific package variants within the TO-277 family and are mechanically compatible for PCB assembly.

Q: Why is TPAR3G designated as Last Time Buy?

A: Last Time Buy status indicates the manufacturer has discontinued production. TPAR3J S1G and TUAR4GH are both in Active product status, ensuring continued availability and supply chain stability for new designs and production continuity.

Q: What compliance certifications apply to all three parts?

A: All three parts are ROHS3 compliant, REACH unaffected, and carry MSL 1 (Unlimited) moisture sensitivity rating. TUAR4GH additionally includes AEC-Q101 automotive qualification. All parts carry ECCN EAR99 and HTSUS 8541.10.0080 classifications.

Q: How do reverse leakage characteristics compare?

A: TPAR3G exhibits 10µA reverse leakage at 400V. TPAR3J S1G exhibits 10µA reverse leakage at 600V (higher voltage rating). TUAR4GH exhibits 5µA reverse leakage at 400V, representing superior leakage performance. Applications sensitive to leakage current may benefit from TUAR4GH selection.

Q: What is the impact of different reverse recovery times?

A: TPAR3G and TPAR3J S1G both specify 120ns reverse recovery time. TUAR4GH specifies 150ns. All three parts meet the Fast Recovery classification (≤500ns, >200mA). The 30ns difference between TPAR3G/TPAR3J S1G and TUAR4GH is negligible for most applications but may affect switching loss calculations in high-frequency circuits.