Diodes Incorporated DFLT8V5A-7

Overview

DFLT8V5A-7 from Diodes Incorporated is a unidirectional transient voltage suppressor (TVS) diode in PowerDI123 package, designed for primary overvoltage protection of DC power rails and signal lines. It features 8.5 V reverse standoff voltage, 9.44–10.4 V breakdown voltage at 1.0 mA test current, 14.4 V max clamping voltage at 15.6 A peak pulse current, and 225 W peak pulse power dissipation (10/1000 µs waveform), used in automotive body control modules and industrial sensor interfaces.

For engineers reviewing the DFLT8V5A-7 datasheet, DFLT8V5A-7 pinout, DFLT8V5A-7 application, or DFLT8V5A-7 equivalent, key selection criteria include clamping voltage margin relative to protected IC V_CC, I_PP capability under surge standards (IEC 61000-4-5), thermal resistance (R_θJS = 6 °C/W), and AEC-Q101 qualification status for automotive deployment.

Technical Context

This TVS operates in avalanche breakdown mode to clamp transient overvoltages above its standoff threshold while maintaining low leakage (<10 µA at 8.5 V). Its unidirectional configuration provides asymmetric protection-low forward voltage (3.5 V @ 12 A) enables use as a crowbar or polarity-sensitive clamp in DC supply lines.

The device is optimized for fast response (sub-nanosecond turn-on) and high-energy handling in compact PowerDI123 surface-mount packaging. Thermal design leverages low junction-to-solder-point resistance (6 °C/W) to sustain repetitive surges when mounted on 2 oz copper pads per JEDEC standards.

Key Specifications

Pinout & Package

Package: PowerDI123 - Surface-mount, 3-pin (cathode-band marked), green molding compound, UL 94V-0 rated, 0.01 g weight, moisture sensitivity level 1.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar TVS diode applications.

Compared with SMAJ8.5A, DFLT8V5A-7 offers superior board-space efficiency and thermal performance in PowerDI123, while DFLT8V5AQ adds automotive-specific process controls without altering electrical behavior-making the base -7 variant optimal for cost-sensitive industrial designs where qualification isn't mandated.

Availability

DFLT8V5A-7 is available at Aetrix Electronics and suitable for automotive body control modules, industrial CAN transceiver protection, and smart meter power input stages requiring stable component supply across multi-year production cycles.

Supply support for DFLT8V5A-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 centers and manufacturing facilities across Asia and the Americas.

The DFLT series targets high-reliability transient suppression in automotive and industrial environments, emphasizing low clamping ratios, AEC-Q101 qualification pathways, and thermally efficient PowerDI packaging for demanding surge environments.

FAQ

What is the maximum operating temperature for DFLT8V5A-7?

The DFLT8V5A-7 has an operating junction temperature range of –65 °C to +150 °C. Its thermal resistance from junction to solder point is 6 °C/W, allowing safe operation at full 225 W pulse power when mounted on a 1-inch² 2 oz copper pad per JEDEC JESD51-3 standards.

Is DFLT8V5A-7 RoHS and halogen-free compliant?

Yes. DFLT8V5A-7 meets EU RoHS directives 2002/95/EC, 2011/65/EU, and 2015/863/EU, with lead-free matte tin plating over copper leadframe. It is also halogen- and antimony-free ("Green"), containing <900 ppm bromine, <900 ppm chlorine, and <1000 ppm antimony compounds.

Does DFLT8V5A-7 require a heatsink for standard surge duty?

No external heatsink is required. With R_θJS = 6 °C/W and R_θJA = 125 °C/W, the device dissipates steady-state power (1.0 W max) effectively through the PCB copper pad. For repetitive 10/1000 µs surges at ≤1 Hz, a 1-inch² 2 oz copper pad provides sufficient thermal mass without auxiliary cooling.

How does DFLT8V5A-7 differ from bidirectional TVS diodes?

DFLT8V5A-7 is unidirectional: it clamps only positive transients relative to ground and conducts like a rectifier in forward bias. Bidirectional variants (e.g., DMLF8V5A) protect both polarities but exhibit higher leakage and capacitance. Use DFLT8V5A-7 where DC polarity is fixed and low leakage is critical.