DFLT43A-7 Equivalent & Substitute Parts

Part Overview

The DFLT43A-7 is a unidirectional Transient Voltage Suppressor (TVS) diode manufactured by Diodes Incorporated, designed for general-purpose overvoltage protection applications. This component features a 43V reverse standoff voltage with a 69.4V maximum clamping voltage and 3.24A peak pulse current capability in a PowerDI™ 123 surface mount package. The part is currently active in production with full RoHS3 compliance and unlimited moisture sensitivity rating.

Equivalent and substitute parts are identified when they maintain identical electrical performance parameters—specifically reverse standoff voltage, breakdown voltage, clamping voltage, and peak pulse current ratings—while potentially offering different packaging formats, current handling capabilities, or temperature operating ranges that may better suit specific application requirements.

Substiute Parts

DFLT43A-7

Diodes IncorporatedIn Stock: 9697DFLT43A-7 Datasheet

Current PartRFQ

PTVS43VS1UR,115

Nexperia USA Inc.In Stock: 18876PTVS43VS1UR,115 Datasheet

MFR RecommendedRFQ

SMF43A-TP

Micro Commercial CoIn Stock: 6234SMF43A-TP Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DFLT43A-7 are qualified based on the following electrical parameters that must remain constant:

• Voltage - Reverse Standoff (Typ): 43V
• Voltage - Breakdown (Min): 47.8V
• Voltage - Clamping (Max) @ Ipp: 69.4V
• Type: Unidirectional Zener TVS Diode
• Unidirectional Channels: 1

The identified substitute parts maintain these core electrical specifications while differing in packaging format, peak pulse current rating, power dissipation capability, and operating temperature range. These variations allow for component selection based on specific thermal, spatial, or current-handling requirements within the same voltage protection class.

Parameter Comparison

Engineering Selection Recommendations

All three parts maintain identical voltage protection specifications (43V standoff, 47.8V breakdown, 69.4V clamping) and are suitable for direct substitution in applications where the electrical performance parameters are the primary selection criteria.

PTVS43VS1UR,115 (Nexperia) offers the highest peak pulse current rating (5.8A) and power dissipation capability (400W), making it suitable for applications requiring enhanced transient energy absorption. This part includes AEC-Q101 automotive qualification, indicating suitability for automotive-grade applications. The SOD-123W package provides a compact surface mount footprint. Operating temperature range is -55°C to 150°C.

SMF43A-TP (Micro Commercial Co) provides the widest operating temperature range (-65°C to 175°C) and maintains compatibility with the original DFLT43A-7 lower temperature limit of -65°C. Peak pulse current is rated at 2.9A with 200W power dissipation. The SOD-123F package is a standard surface mount format. This part is available in Cut Tape and Digi-Reel® packaging options.

DFLT43A-7 (Diodes Incorporated) remains the original specification with 3.24A peak pulse current and 225W power dissipation in the PowerDI™ 123 package. Operating temperature range is -65°C to 150°C (junction temperature).

Selection should be based on specific application requirements: thermal management capability, package space constraints, temperature operating range, and available packaging formats.

Frequently Asked Questions (FAQ)

Q: Can PTVS43VS1UR,115 replace DFLT43A-7 in all applications?

A: Yes, from an electrical protection standpoint. The PTVS43VS1UR,115 maintains identical voltage specifications (43V standoff, 69.4V clamping) and exceeds the current handling capability (5.8A vs 3.24A). However, the package format differs (SOD-123W vs PowerDI™ 123), requiring PCB layout verification. The operating temperature range is -55°C to 150°C versus -65°C to 150°C for the original part.

Q: What is the difference between the three substitute options?

A: All three parts provide identical voltage protection at 43V standoff and 69.4V clamping. Differences exist in peak pulse current rating (PTVS43VS1UR,115: 5.8A, DFLT43A-7: 3.24A, SMF43A-TP: 2.9A), power dissipation (PTVS43VS1UR,115: 400W, DFLT43A-7: 225W, SMF43A-TP: 200W), package format (PowerDI™ 123, SOD-123W, SOD-123F respectively), and operating temperature ranges.

Q: Is SMF43A-TP suitable for low-temperature applications?

A: Yes. SMF43A-TP maintains the -65°C lower operating limit of the original DFLT43A-7 and extends the upper limit to 175°C, providing the widest temperature range among the three options.

Q: Does package format affect electrical performance?

A: Package format does not alter the core electrical protection parameters (voltage ratings, clamping characteristics). However, different packages have different thermal characteristics and PCB footprints. PowerDI™ 123, SOD-123W, and SOD-123F are all surface mount packages with different land patterns and thermal dissipation properties.

Q: Are all parts RoHS3 compliant?

A: Yes. DFLT43A-7, PTVS43VS1UR,115, and SMF43A-TP are all RoHS3 compliant with unlimited moisture sensitivity rating (MSL 1) and REACH unaffected status.

Q: Which part should I select for automotive applications?

A: PTVS43VS1UR,115 carries AEC-Q101 automotive qualification, making it the specified choice for automotive-grade requirements. The other parts do not list automotive qualification in their provided specifications.