Diodes Incorporated DFLT24AQ-7

Overview

DFLT24AQ-7 from Diodes Incorporated is an AEC-Q101-qualified, surface-mount transient voltage suppressor (TVS) diode in PowerDI®123 package, designed for automotive power line and signal line protection. It features a 24 V reverse standoff voltage, 29.5 V maximum breakdown voltage at 1 mA, 38.9 V clamping voltage at 5.78 A peak pulse current, and 225 W peak pulse power dissipation (10/1000 µs waveform).

For engineers reviewing the DFLT24AQ-7 datasheet, DFLT24AQ-7 pinout, DFLT24AQ-7 application, or DFLT24AQ-7 equivalent, key selection criteria include clamping performance under ISO 7637-2 pulse 1/2a/3a, thermal resistance (R_θJS = 6 °C/W), AEC-Q101 qualification status, and compatibility with 12 V/24 V automotive electrical systems.

Technical Context

This unidirectional TVS diode operates in avalanche mode to clamp transient overvoltages above its reverse standoff voltage (24 V), limiting downstream circuit voltage to ≤38.9 V during 10/1000 µs surges up to 5.78 A. Its low R_θJS of 6 °C/W enables effective heat transfer from junction to PCB cathode pad, supporting sustained operation in high-temperature engine bay environments.

The device uses a planar silicon junction structure optimized for fast response (<1 ps typical), low capacitance (≈100 pF at 0 V bias), and stable leakage (<1 µA at 24 V). It is rated for -55 °C to +150 °C operating temperature and meets IATF 16949 manufacturing requirements.

Key Specifications

Pinout & Package

Package: PowerDI®123 - Surface-mount, single-ended, cathode-band marked plastic package with exposed cathode tab for thermal and electrical connection. Dimensions: 3.70 mm × 1.78 mm × 1.00 mm (L × W × H); weight ≈ 0.01 g; moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar transient suppression applications.

Compared with SMAJ24A and TPSMF24A, DFLT24AQ-7 offers superior thermal management via its PowerDI123 cathode-tab design (R_θJS = 6 °C/W), making it optimal for thermally demanding, high-duty-cycle automotive power rails where long-term reliability under repeated transients is essential.

Availability

DFLT24AQ-7 is available at Aetrix Electronics and suitable for automotive engine control units, body electronics modules, and ADAS camera power supplies requiring stable component supply with full AEC-Q101 traceability and PPAP documentation support.

Supply support for DFLT24AQ-7 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Diodes Incorporated is a global manufacturer of discrete semiconductors and analog ICs, headquartered in Plano, Texas, with design, manufacturing, and sales operations across Asia, Europe, and the Americas.

The DFLT series belongs to Diodes' automotive-grade TVS portfolio, engineered specifically for robust transient suppression in 12 V/24 V vehicle electrical architectures, emphasizing AEC-Q101 compliance, thermal efficiency, and IATF 16949 process control.

FAQ

What is the maximum peak pulse current (I_PP) for DFLT24AQ-7 under standard test conditions?

The DFLT24AQ-7 supports a maximum peak pulse current of 5.78 A under the 10/1000 µs waveform condition, as specified in the Electrical Characteristics table on page 2 of DS39043 Rev. 6-2. This value is measured at 25 °C ambient and corresponds to a clamping voltage of 38.9 V. Derating applies above 25 °C per Figure 1 in the datasheet.

Is DFLT24AQ-7 suitable for bidirectional transient suppression?

No, DFLT24AQ-7 is a unidirectional TVS diode intended only for DC circuits with defined polarity. Its cathode-band marking and asymmetric IV curve mean it conducts only during reverse-biased overvoltage events. For AC or bidirectional signal lines (e.g., CAN bus), a dedicated bidirectional part such as DFLT24AQ-B or SMAJ24CA must be used.

How does the PowerDI123 package improve thermal performance compared to SMA or SOD-123?

The PowerDI123 package features an exposed cathode metal tab that provides a low-resistance thermal path (R_θJS = 6 °C/W) directly from the silicon die to the PCB copper pour. In contrast, SMA and SOD-123 rely on leadframe conduction with higher R_θJA values (>100 °C/W), resulting in greater junction temperature rise during repetitive surges.

Does DFLT24AQ-7 meet ISO 7637-2 compliance out-of-the-box?

DFLT24AQ-7 is not itself certified to ISO 7637-2, but its 225 W peak pulse rating (10/1000 µs) and 38.9 V clamping voltage enable system-level compliance when properly integrated-e.g., with appropriate PCB layout, grounding, and series impedance-into circuits targeting Pulse 1 (inductive load disconnect), Pulse 2a (load dump), and Pulse 3a/b (switching transients) waveforms.